1. The overall optimization design technology of open-pit mine

Our company exclusively owns the design experience of nearly 100 open pit mines, uses the international mining software and independent software for boundary optimization, mining and stripping plan, dumping plan and other auxiliary design and provides the overall optimization solutions of open-pit mine.

2. Mining technology of extra-large-size mine and complicated open pit mine

Our company masters the stage mining technology, steep mining technology, discontinuous-continuous transportation technology etc., thus significantly  compressing the early production stripping ratio of open pit mine, postponing the stripping peak and reducing the capital investment and the production cost .

3. Chamber control blasting technology

The hilltop stripping and major blasting with more than kiloton explosive will speed up the stripping in capital construction of high and steep hilltop in open pit mine; the directional throw blasting technology will speed up the formation of alpine terrain industrial sites.

4. Safety and high-efficient mining technology of the intercoordination from open pit mining to underground mining  

The open pit and underground mining are mutually coordinated  in the relationship between time and space,  the output is smoothly transited and the key links such as hoisting, transportation, ventilation and drainage are rationally connected. In 2015, Northern Engineering & Technology Corporation, MCC participated and accomplished the  project of "Study and Practice of Large Size Digitalized Underground Metal Mine Construction Through Highly Efficient Transition from Open Pit to Underground Mining" , which  has been honorably awarded with the Second Prize of National Award of Science and Technology Progress", which takes the Transition from Open Pit to Underground Mining of Shougang Xingshan Iron Mine as the reference project and combines the new type resource exploitation process with the modern digitalized and automatic technology and creatively realizes the technical upgrading of enterprise and highly-efficient transition of exploitation mode.

5. Mining technology of sublevel caving method without sill pillar with main structure parameters

This technology can increase the structure parameters of the stope, reduce the stope preparation ratio & the production cost, and improve the mining intensity & the production efficiency.

6. Key technology in safe and high-efficient mining of deep metallic mineral deposit

The technologies in process, ventilation, drainage and supporting etc. for mining the super-large -scale mine with kilometer deep shaft will realize safe, efficient and economical mining.

7. No-waste mining technology for large-scale underground mine

Underground waste rock is not required to be taken out of the shaft, it can be prepared as the gravel for underground production, thus reducing  the operating costs and the production costs; The low- temperature heat energy contained in underground wastewater and waste gas of the mine is fully used in order to replace the traditional coal-fired boiler and the split type air conditioner in summer, to purify the return air of the mine shaft, to reduce the energy consumption value of unit product of the mine, thus realizing high efficiency, energy saving and environmental protection and  laying the foundation for the construction of green mine.

8. Technology of continuous preparation and pipeline conveying by gravity used in the mine cemented-filled with unclassified tailings

Our company owns the proprietary intellectual property rights and a number of patented technology to realize the continuous preparation of the filling slurry of large flow and pipeline conveying by gravity, a single set of filling slurry preparation system with 150~200m³/h, the automatic operation of the system, high efficiency and environmental protection, thus creating the preconditions for realization of no-tailings discharged from the mine.

9. Multi-stage intensified mining technology for extra-large-size mine

The sublevel open stoping with subsequent backfilling of intensified mining is used in two stages at the same time to achieve economies of scale.

10. Mining technology for large-scale underground mine in high-cold and high -altitude condition

The corresponding standards for the process and equipment selection are established for the mining technology of underground mine in high -cold and high -altitude condition.

11. Hoisting technology for the deep shaft in the mine super -large scale of 10–million- ton

The Hoisting technology for the vertical shafts, of which the single shaft depth is over one kilometer and the capacity is of 10- million- ton,  was the first design in China

12. Ventilation technology of high-efficiency, energy-saving and multi-stage fan stations

Multi-stage fan station ventilation is used for underground mine; the fans are remotely centralized –controlled; and the underground mine is ventilated according to the demand to reduce the energy consumption.

13. Digital mining technology

1) Intelligent  mine system for the open pit mines: the advanced data acquisition and optimization management technology are used for the optimal allocation and intelligent management of resources, equipment, personnel for the whole production process of open-pit mine to realize the resource control, improve the equipment efficiency and reduce the production costs.

2) The integrated control platform of underground mine: Based on the integrated automation and high-speed network construction and with the unmanned production control and virtual reality platform as the core, the integrated control solutions of underground mine is realized.

1、Process of extra-large-size beneficiation plant and beneficiation equipment integration technology

The process optimization of extra-large-size beneficiation plant and innovation and integration of core beneficiation equipment will lead to the improvement of availability of beneficiation plant, reducing of energy consumption and improvement of efficiency and production capacity.

2、Beneficiation technology on mixed ore of hematite and magnetite with micro fine particles complicated and difficult in mineral processing

Our company has studied and solved the key technology puzzles of influencing flotation separation, developed the mineral processing flowsheet that is suitable for mineral processing to the mixed ore of hematite and magnetite with micro fine particles  complicated and difficult in mineral processing. In 2014, relying on Yuanjiacun Project of Taiyuan Iron & Steel Complex, our company won the top grade prize of metallurgical science technology prize in the year 2014 for the “Beneficiation Technology Development on Mixed Ore of Hematite and Magnetite with micro fine particles Complicated and Difficult in Mineral Processing and 22Mt/a Equipment Integration, which pioneered the mineral processing technology of micro fine hematite.

3、Sea water beneficiation technology

This technology has effectively solved the problem that normal beneficiation cannot be done due to lack of freshwater resources, and it also applies to beneficiation technology of using sea water from the well and "bitter and salted” water"

4、Magnetic roastingbeneficiation technology

Our company has pioneered the siderite beneficiation, initiated   the roasting magnetic separation technology of hematite and specularite, and  industrialized the application of the beneficiation technology of suspending, magnetizing and roasting in China for the first time.

5、Beneficiation technology of increasing iron concentrate grade  and decreasing impurities

This technology has been in the leading position in beneficiation technical index in the world; it includes two sets of advanced process of anion reverse flotation on hematite and magnetic elutriation column separation on magnetite, which can effectively eliminate the impurities in magnetic iron ore or hematite, thus increasing the grade of the iron concentrate.  

6、Simulation and optimization of grinding-classification process flow

Our company has  collected the production data of grinding-classification process of various large-scale  beneficiation plants at home, set up the system database, corrected and optimized the process parameters of the  simulation software, and can select the grinding and classification technical process with maximum efficiency and best energy-saving with regard to different kinds of mineral ores.

7、Comprehensive utilization technology of complex polymetallic associated iron ore

Polymetallic one-after-another beneficiation technology is used forrecycling of mineral ores with high-added value of polymetallic ore.

8、Long- distance concentrate transportation technology

This technology can reduce the transportation pressure of railways, with low operation costs, low energy, low infrastructure investment, fast construction speed and short construction cycle

9、Beneficiation technology of nonferrous metal and precious metal ore

Our company has the technical strength  of beneficiation and separation of nonferrous metals ore including precious metal, copper and cobalt ore, copper-molybdenum ore, lead zinc ore, schreyerite, and chromium ore etc.

10、Comprehensive automation technology

This technology includes the foundation automation, expert's control system, stockyard comprehensive management system, long -distance belt conveyor conveying control system, long- distance pipe leakage checking and positioning system, thus the beneficiation process automation is realized and further the product quality and labor productivity are improved  and the energy consumption and production costs are reduced.

11、BIM coordination design technology

By adopting BIM technology, our company can provide 3D design solution proposal, and provide design team as well as the coordination working platform for all construction main bodies including the operation companies in order to conduct simulation, evaluation and optimization to the construction process.

Big data acquisition and analysis as well as remote service technology

Based on the improvement of comprehensive automation level and application of internet + technology of beneficiation plant, and by establishing data acquisition analysis system, expert's system, data management and service platform, production management and control platform and data application management platform, this technology can realize remote data acquisition, big data analysis, operation supervision and control, remote service, and the client's remote operation and control, data automation acquisition and analysis, self-learning of modernization beneficiation expert system, and can improve the site technical level and management level in all round

1、Sintering Flue Gas Circulating Technology-Energy Conservation, Consumption Reduction, Pollution Minimizing and Efficiency Enhancement

Flue gas circulating technology is a cleaner production technology developed based on the theory that part of hot flue gas is brought back into sintering process. The flue gas circulating technology devised by NETC is applicable to varieties of processes and by the source of circulating flue gas, this technology is mainly divided into two modes: internal circulation and external circulation.

Effects of Energy Conservation and Emission Reduction

Reducing 20% to 50% of total emitted sintering flue gas is the most effective method to alleviate flue gas pollution in sintering plant.

Reducing emission of hazardous substances per unit product

Significantly reducing investment and operating cost of sintering flue gas treatment facilities (including hazardous substance removal device)

Sintering hot flue gas circulation: increasing thermal utilization and reducing 2% of solid fuel consumption

2、Flue Gas Purification Technology with Active Coke Five in One, Collaborative Treatment, Proprietary Intellectual Property Right and Domestic Equipment: Saving about 50% of Investment

For flue gas purification technology with active coke, coal-based active coke is used as absorber to absorb and remove SO₂ in flue gas. Active coke after absorption can be reclaimed by heating and the desorbed gas mixture containing high-density SO₂ can be directly used to produce 98% concentrated sulphuric acid, achieving recycling of sulphur. Meanwhile, catalytic function of active coke is used to reduce NOx in flue gas to N₂ and water by adding proper amount of ammonia, and thus efficiency of desulphurization can reach above 98% and efficiency of denitration can reach 70%. In addition, this technology has good results of removing heavy metal and dioxin in flue gas. No waste water or waste residue is generated in the process of purification and it’s an advanced flue gas purification technology that completely solves environmental problems in steel and iron industry.

Energy Conservation and Emission Reduction Effects

Desulfurization, denitration, dioxin removal, heavy metal removal and dedusting are achieved at one stroke with desulfurization rate above 98% and denitration rate of 70%.

Dry processing with no waste water or waste residue generated in the process of purification and with no secondary pollution

Low corrosion on equipment and low maintenance cost

Reclamation of by-product, which is 98% concentrated sulfuric acid and has goof economic returns

It can be used in cooperation with sintering process to dispose(slake) of desulfurized fly ash produced by calcium-based semi-dry desulfurization process and at the same time, the yield of by-product, sulfuric acid can be improved and returns can be increased.

3、Technology for Efficient Recovery and Utilization of Waste Heat Resources of Circular Cooler—Distinguished sealing technology: Ensuring Efficient Recovery and Gradient Utilization of Waste Heat

A multi-functional high-efficient sintering circular cooler and waste heat gradient and efficient utilization technology:

It can be applied to fabrication of new equipment and also for renovation of traditional sintering circular cooler. Through such measures as adjusting cooling air

flow and material bed thickness, lowering air leakage of sintering system and cooling system, waste heat gradient utilization technology can achieve efficient recovery of sensible heats of sinter ore product and sintering flue gas and gradient utilization of recycled waste heat.

Energy Conservation and Emission Reduction Effects

（1）Multi-functional High-efficiency Sintering Circular Cooler

（2） Waste Heat Gradient and Efficient Utilization Technology

Reducing energy consumption for sintering process by 3 to 5 kgce/t-s

Dust-suppression pipe waste heat utilization technology is adopted as well and power generation can be increased by 2 kW.h to 5 kW·h for finished product ore per ton. 

4、Integrated type Environment-friendly Screening System—Vertical Sizing Process with High Efficiency, Low Energy Consumption & Emission and Small Occupation of Land

Integrated type environment-friendly screening system is developed jointly by NETC and Ji'nan Zhongran Technology Development Co., Ltd. Vertical arrangement is possible with equipment in small size, saving occupation of land; bar type mesh and a fully-enclosed structure are adopted for vibrating screen and only tiny negative pressure is required inside to satisfy dedusting requirements, greatly reducing the pressure of dedusting system; Vibrating equipment is light-weighted equipped with a mall power motor, saving electric energy.

Energy Conservation and Emission Reduction Effects

For 360㎡ sintering machine, comparison between traditional screening system and integrated type screening system in terms of investment and operation cost are as follows:

5、Sintering Optimization System—realizes simulation of sintering process and control by artificial intelligence expert Sintering optimization system is a control system based on sintering process model with intelligence expert system as control core. This system inputs operating experience and habits of process operation experts into knowledge base of expert system and uses them as basis for expert system to guide production. The system mainly contains three parts, which are process information and data management system, process model and sintering expert system.

Compared with conventional process control, process operation is more smooth and steadier. Monitoring of measured data and process guidance based on this measured data become more efficient.

Energy Conservation and Emission Reduction Effects

Reducing fuel consumption: Coke consumption for sinter ore per ton decreases by 1 to 2 kg

Stabilizing product quality: Avoiding major control acts and critical process conditions, for example, standard deviation of basicity fluctuation drops by 3% to 5%.

Improving productivity: 4% to 5%

Properly reducing emission

6、High-efficiency Sintering and Dedusting Technology—high dedusting efficiency,strong stability and compliant with the latest emission standards

High-efficiency sintering and dedusting technology is a main technological means to control and handle fine particulate and dust nowadays, characterized by high efficiency, strong stability, low resistance of filter bag, long service life and lesser maintenance. Equilibrium simulation technology for dedusting pipe network can reduce unbalance of pipe networks, make the most of effective air flow  do dedusting, save investment in the system and reduce operation cost. Dedusting system adopts the most advanced wear-resisting technology, which significantly reduce the wear of dedusting pipe network, lower operation cost and decrease labor intensity of maintenance.

Energy Conservation and Emission Reduction Effects

Reducing emission load of hazardous substance per unit product and keeping dust emission concentration no more than 20mg/Nm³ on a stable and long-term basis;

Low operating resistance:  Power of induced draft fan with 10000 m³/h flow rate can decrease by 1.74kW;

High dedusting efficiency:  Dedusting efficiency at electrical area is 75% to 80%;

Long dedusting cycle:  Its dedusting cycle is 3 times longer than mere bag filters;

Low consumption of air:  Consumption of compressed air is lower than 1/3 of mere bag filters.

Long service life of filter bag: service life of filter bags can extend 1year more than mere bag filters.

Low comprehensive operation and maintenance fees for equipment

1. Process and Technologies of Large-scale Grate-kiln Pelletizing

(1) Thermal process technology

The hot air circulating technology of traveling grate-rotary kiln-circular cooler with the independent intellectual property rights owned by NETC and the reasonable thermal system of three main machines developed by NETC are the necessary conditions for the successful travelling grate-kiln pelletizing production.

(2) Pellet production technology totally with hematite

NETC has researched and developed a series of process technology aiming at the features presented by hematite in the whole process of pelletizing production, which has been verified in practice and become mature, thus  laying a solid foundation for the extensive use of hematite as raw materials to produce the pellets.

(3) Production technology of high-quality pellet

According to the material conditions and the requirement of the users, NETC can pertinently design and select the reasonable production process, to truly realize“Custom-Made Process”. According to the division of pellet ingredients, NETC can provide the production process and equipment for producing pellets with natural alkalinity and solvent and the pellet containing carbon, magnesium and other elements; according to the division of the pellet purposes, the products can meet the requirements of blast furnace iron-making, steel-making and direct reduction etc..

(4) The related technology of pelletizing production process

The production process of traveling grate-rotary kiln pellet developed by NETC is advanced and reasonable and is the precondition for stable and smooth production of large-scale pellet.

2. Process technology of large-scale straight grate roasting pellet

The hot air circulating system and “self-absorption air” combustion technology with the proprietary intellectual property rights owned by NETC have been optimized for many times on the overall design and the process system configuration to ensure the technical advancement and the production reliability. The straight grate pellet process independently researched and developed by NETC can also adapt the complicated raw material conditions, especially the production of raw materials containing the hazardous substance. The straight grate project of Baogang Group solved the serious problem of fluorine contained in raw material and waste gas containing- fluorine generating in the process of the production, which  not only avoids the environmental pollution, but also ensures the smooth progress of the production.

With the requirement of equipment upsizing development, NETC has researched and developed the non-standard equipment and the corresponding thermal process of the straight grate machine with capacity of 3Mt, 4Mt and 5Mt/a , which solved a series of problems of short service life and low thermal efficiency of roasting furnace and  high air leakage rate of the straight grate roasting machine.

3. Development of large-scale pelletizing core equipment

(1) Disc balling machine;

NETC has researched and designed the balling machine with characteristics of high equipment utilization and low energy consumption and  has successively designed φ6m,φ7m andφ7.5m disk balling machines for various pellet plants in China, of which the core product isφ7.5m disc balling machine where the center shaft supporting structure is used with the advantages of stepless adjustment in rotating speed of disc surface and  rotating blade and disk tilt angle. According to the principle of the growth mechanism of “ Ball Forms while Water Drips; Ball Grows while Water Sprays”, NETC has designed two kinds of nozzles for water supply, where the water amount can be adjusted according to the actual situation. NETC owns the proprietary intellectual property rights of the electric rotary scraper created by it, whose inside diameter  is bigger and outside diameter is smaller.

(2) Large-scale traveling grate

NETC owns the full set of core technology of large-scale traveling grate machine; and  the 5.8×78m traveling grate machine developed and designed by NETC is largest in unit specification in China. The core technologies owned by NETC include the heat insulation structure used for chain link to separate the heating element from the bearing part, the application of whole chain link inner -sleeve technology, the application of axial fixing technology between the side plate and the link inner sleeve , the application of a new type of grid plate, the application of water-cooled hollow shaft for the supporting wheel of preheating zone in the high temperature area, the application of four-point driving at two sides of head and tail  and the designing of independent bellows into the air chamber structure etc.. The application of these technologies improves the reliability of the equipment and provides the technical assurance for the stable production.

(3) Rotary kiln for the large-scale pellet plant

NETC has thoroughly studied how to ensure the strength and stiffness of cylinder in the development process of large-scale rotary kiln; how to grasp the change of the temperature at each point of the kiln; how to choose the support point and the stress condition; how to choose the section form of the tyre according to the stress condition; how to choose the head and tail sealing devices; how to choose the cooling method of suitable fixed sieve, feeding chute and sealing device etc.. NETC has researched and designed Φ6.96×52m rotary kiln , which is the largest rotary kiln in unit specification and the handling capacity in China and can meet the roasting temperature and roasting time of various raw material pellets.

(4) Circular cooler for large-scale pellet plant

By combining with existing technologies and learning from the advanced experiences at home and abroad, NETC has further researched the several key problems of circular cooler enlargement, proposed the creative solutions, and solved the key problems in the process of circular cooler enlargement and NETC has a number of independent innovation and patent technologies of new driving device, rotary body, bend rail, feed hopper, unloading system, and spillage handling system etc..

(5) Completing equipment for the Large-scale straight grate roasting machine for pelletizing

The working procedure of straight grate roasting machine and grate-kiln pellet process is the same before the green balls are distributed. The difference lies in the roasting system, namely the pelletizing process of straight grate roasting machine is drying, preheating, roasting and cooling etc. completed by one straight grate roasting machine; it has many  advantages of short process flow, high equipment operation rate, high heat efficiency, land and investment saving etc.. Based on the existing engineering design of straight grate pellet roasting machine for Baogang Group and Ansteel, NETC has digested and absorbed the advanced technology of foreign countries and has saved the design technology and innovation of all the large-scale roasting machine .

4.Automatic control system of pelletizing engineering

The automatic control system has perfect distributed control functions,  achieving the integration of electric power, instrument and control (EIC), meeting the requirements of production management, process and sequence control, realizing a series of special method and control method of the process parameters detection of the automatic control of traveling grate green ball distribution, the synchronous control to the wheels at head and tail of the traveling grate machine,  and the comprehensive measurement and control to the temperature inside the rotary kiln and promoting the improvement and innovation of the grate-kiln pelletizing process.

(1) Temperature control of hot stove of drying machine

(2) Detection and control of feed column height of high pressure grinding mill(HPGR);

(3) Control of the amount of balling feed and the amount of water added

(4) Swinging speed control of swinging belt conveyor;

(5) Automatic control to the distribution of green balls on straight grate roasting  machine / travelling  grate machine

(6) Detection of materials layer thickness;

(7) Synchronous control to head and tail wheels of traveling grate;

(8) Detection and control to the temperature inside the rotary kiln

(9) Detection and control to the material level of feed hopper of circular cooler

(10) Application of other new technologies and methods