1 jigging process

In the traditional coal preparation method, the advantages of simple process, large processing capacity, good sorting effect and low investment have dominated the coal washing in Shanxi Province. Mainly used in the Qinshui coalfield, Xishan coalfield, Huoxi coalfield, Datong coalfield in Shanxi Province.

1.1 The main position of the jigging coal preparation process in Shanxi Coal Preparation Plant will be gradually replaced.

With the increasing demand for coal ash control by coal users, the selection of a large number of coking coal preparation plants using the jigging process has become a difficult choice from the original medium or easy to choose. Extremely difficult to choose, the original jigging has not adapted to the current market situation.

1.2 In a certain period of time, the jigging coal preparation process in Shanxi Province, the easy selection and easy selection of coal selection plant will not be completely replaced by the jigging coal preparation method is a mature and technically economically suitable coal preparation method, and Further improved in practice. As the jigs move toward larger equipment, lower manufacturing and operating costs, precise sorting, automation of stand-alone machines and systems, the jigging process is constantly adapting to the development of coal preparation processes. Especially in recent years, with the research of the automatic control system of the damper control system, the automatic discharge system of the jig, the coal supply control and the on-line detection system of the clean coal ash, the jigging process has been further developed.

1.3 The moving sieve jigging process will continue to be used in specific coal preparation plants in Shanxi Province.

The moving sieve jig is a new type of washing equipment that has emerged in recent years. It has the advantages of simple process operation, energy saving and water saving, low investment and low operating cost. The coal preparation plant in Shanxi Province is mainly used for the separation of large coal caving and thermal coal briquettes. The jig excavation is not restricted by the sorting density. For the raw coal with large content of niobium in the middle block, especially the vermiculite is easy to mud. The coal can be discharged from the system as early as possible due to the sifting and smashing of the moving sieve, which is very beneficial to the subsequent main selection process.

2 heavy media process

After decades of production practice and scientific research, heavy medium coal preparation technology has become increasingly mature, with many advantages such as high sorting efficiency, wide selection of particle size and density range, simple process operation, convenient adjustment, and easy automation control. At present, the technological transformation of Shanxi Coal Preparation Plant and the preferred process for new coal preparation plant.

2.1 The application rate of heavy medium coal preparation technology in Shanxi Province will rise rapidly and will become the main process

Heavy medium coal preparation has high sorting precision, strong adaptability to raw coal, easy to realize automatic control and other advantages, and meets the requirements of the current coal preparation industry. Especially in recent years, with the development and progress of heavy medium coal preparation equipment technology, the outstanding problems such as high dielectric consumption, poor performance of wear-resistant materials, complex medium recycling and reuse system, and difficult management have been solved to a certain extent. The application of heavy medium coal preparation process. In particular, the successful design and use of the modular heavy medium coal preparation plant in some coal preparation plants in Shanxi Province (the majority of the new coal preparation plant of Tongmei Group and Jinmei Group) has greatly reduced the basic cost of the heavy medium system. The method of selecting coal for heavy medium has created conditions for the popularization and application of large-scale in Shanxi Province.

2.2 The equipment is large-sized and the process is more and more simplified (represented by the simplified process of “1+1” coking coal)

The simplified heavy-weight coal preparation process with large-scale pressureless feed three-product heavy medium cyclone as the main equipment and the three-product heavy medium coal preparation process with single-density two-stage two-product heavy medium cyclone as the main equipment The research was successful, and some coal preparation plants have also withstood the test of production and achieved good economic benefits.

The simplification of the process flow is also the main trend of the development of heavy medium plant selection process in the future. "1+l" mode coking coal preparation plant innovation technology and application in Wenfeng coal preparation plant in Shanxi Province, the process has low dielectric consumption, low processing cost per ton of coal, low power consumption, high coal preparation efficiency, clean coal The quality is stable, the obvious economic benefits have been achieved, and the largest output has been achieved with less investment.

2.3 Pre-dip mud-free and pressure-free three-product heavy medium cyclone separation process will be widely promoted in Shanxi coal preparation plant

The pressureless process adopts deliming and washing, which not only improves the stability of the system, but also effectively reduces the dielectric consumption of the pressureless process. The process has the advantages of a pressureless feed sorting process: low particle size breakage rate of the raw coal, no liquid level balance problem of the material blockage medium pump, the qualified barrel and the mixing barrel; and the heavy medium mesofluid with pressure feed The system has the advantages of low flow rate of qualified medium, high stability of suspension density, high sorting efficiency and low unit dielectric consumption. In order to increase the de-sludge process and make the system complicated, with the development of large-scale coal preparation equipment in recent years, it is only necessary to add a large-scale equal-thickness linear vibrating screen. Only one equipment is added in the system, and the layout is simple. [6]. Xixi Coal and Electricity Group Xiqu Coal Preparation Plant and Huozhou Mining Area's Huidipo Coal Preparation Plant have achieved good results.

3 dry coal preparation process

Shanxi Province is a water-deficient and arid area, and the dry coal preparation process has important application significance. It can solve the sorting problem of water-poor areas and water-prone muddy coals to a certain extent, eliminating the coal slurry water treatment system required for wet coal preparation process, which can reduce infrastructure investment and save water resources in Shanxi. The province has significant economic value and application prospects. At present, the dry coal preparation methods in Shanxi Province mainly include air heavy medium fluidized bed dry coal preparation and composite dry coal preparation. Dry coal preparation is the original coal preparation method in the field of coal preparation technology. It has been applied in many coal preparation plants at home and abroad. With the development of sorting theory research and equipment renewal, it will definitely be a fast coal preparation business in Shanxi Province. Development provides a shortcut.

4 slime sorting process

Flotation is recognized as the best means of sorting fine coal, but it has obvious defects, such as narrow range of effective sorting; need to add flotation reagents, high cost, easy to cause environmental pollution, not completely dissociated The sorting effect of the particles is poor, resulting in loss of coal and deterioration of product quality in the fine particles. The flotation process has a certain regional application in Shanxi Province. It is mainly used in the coking coal preparation plant of Xishan Coalfield and Huoxi Coalfield (Shanxi Coking Coal Group). There are not many applications for thermal coal.

(1) In the short period of time, flotation is still the main technology for recovering slime from Shanxi Coking Coal Concentrator;

(2) The application of flotation process in Shanxi coal preparation plant has certain limitations;

Flotation can only achieve effective separation of less than 0.3mm slime, however, with the increase of the degree of coal mining machinery, the content of fine coal is increasing, and due to the effective partition of the heavy medium cyclone large diameter The lower limit of the lower limit and the upper limit of the flotation feed size result in that the portion of the coarse slime (1.6 to 0.3 mm) between the effective separation lower limit of the heavy medium cyclone and the upper limit of the effective flotation separation is not effectively scored. This is also a problem that needs to be solved in the flotation process.

(3) With the emergence of a new low-cost, high-efficiency slime washing process, single flotation may be replaced by other processes; the flotation process combined with other processes to form a joint sorting process has been applied to a certain extent.

Many coal preparation plants in Shanxi Province use +0.5mm slime to sort by heavy medium cyclone, and -0.5mm slime is sorted by small diameter heavy medium cyclone. It is mainly used in the coal preparation plant of Shanxi Coking Coal Group. However, with the emergence of other emerging sorting processes, the application of small diameter heavy medium cyclone sorting process will not be much. Although sorting coarse coal slime with small diameter heavy medium cyclone can achieve certain sorting effect, there are still some shortcomings: a separate medium purification and recovery system is needed, the system is complicated, the adjustment is difficult, the density fluctuation is large, and the sorting is performed. The effect is poor; a large amount of slime will be generated in the operation of the sorting system, increasing the load of subsequent flotation and the operating cost of the whole plant; the medium consumption is high. Therefore, the application of small-diameter heavy medium cyclone sorting in Shanxi Province has certain limitations.

In the existing coal slime sorting, many coal preparation plants in Datong Coalfield and Qinshui Coalfield use spiral sorting machine sorting and other processes instead of flotation. The spiral sorting machine is suitable for the sorting of coarse coal slime. The best effect is mainly in the range of 1 to 0.075 mm or 2 to 0.10 mm, and the effective sorting granularity is 6 to 0.075 mm, which is between the jigging and the flotation. Flotation constitutes a combined sorting process, which can reduce the upper limit of flotation feed size and reduce the sorting cost. At the same time, it can also recover the clean coal to the maximum extent and obtain good economic benefits. Because the equipment parameters are not easy to determine and adjust, it is difficult to sort coking coal at low density, and it is suitable for coarse coal slurry sorting of better-selective thermal coal. Therefore, it will be selected in Shanxi Province. It has a certain position and has certain limitations in coking coal sorting.

At present, Shanxi Jiaojiao Group Xiegou Coal Preparation Plant and Tongshan Coal Preparation Plant of Tongmei Group use TBS to sort the coarse coal slime according to the characteristics of its selection process and raw coal quality. The sorting cost of flotation and heavy medium cyclone is too high compared to the other two kinds of processes, and the sorting effect of the spiral sorting machine on coking coal at low density is not good, compared with the interference bed sorting process. It has more advantages: the sorting density is controllable and adjustable, and the minimum can reach 1.14kg/L; the effective sorting density range is 1.14~1.18kg/L; the high level of automation does not require complicated feed distribution system. The equipment is simple in structure and small in maintenance workload; no heavy medium and chemical agents are needed, so TBS will occupy a higher and higher position in the sorting application of coarse coal slime in Shanxi Province, which will change the current tradition of Shanxi Province. The coking coal washing process has broad development prospects.

5 Shanxi Coal Preparation Technology Prospect

In the coming period, heavy medium coal preparation will gradually take the lead in replacing jigging coal in Shanxi Province, with the process of simplifying the process as the core of "1+1" (1 pressureless three-product heavy medium cyclone + 1 injection) The high-efficiency heavy-medium coal preparation process represented by the coking coal coal preparation process and the pre-selection de-fluiding pressure-free feeding process will be the key development direction of the coal preparation process in Shanxi Province, but the jigging is still easy to select coal. The preferred method, the “water-saving” coal preparation process such as moving sieve jigging and dry coal preparation will also be developed to a certain extent in Shanxi Province; along with the constant pursuit of the overall coal preparation process, a peculiar The phenomenon is that the separation process of slime is more refined, and the combination of flotation and other sorting processes appears more in the slime sorting. The sorting of coarse slime has also received unprecedented attention. The coal preparation process for different coal types and different uses presents a gratifying situation of “hundred flowers”.

Combined with the current status of sorting process at home and abroad, it is recommended that the following processes be adopted for coal washing in Shanxi Province:

(1) The coking coal reserves in Shanxi Province account for a large proportion of its total coal reserves. The coking coal plant has a very important position in Shanxi Province. In the future, the development direction of coking coal in Shanxi Province is to improve the product quality chain, that is, to reduce the clean coal ash. And moisture, while processing high-sulfur coal, it also reduces sulfur, and at the same time to improve washing efficiency. in particular:

1 Processing large and medium-sized coal preparation plants that are difficult to select and extremely difficult to select coal: the combined process of bulk coal desulfurization and non-pressure three-product heavy medium cyclone separation, coarse coal slurry TBS separation and fine coal slurry flotation; For raw coal with large meteorite content and easy to muddy, the composite dry coal separator and the moving sieve jigging are pre-discharged to improve the coal production rate of the coal preparation plant, reduce production cost and reduce investment;

2 Handling small and medium-sized coal preparation plants that are difficult to select and extremely difficult to select coal: joint process of lump coal dehumidification three-product heavy medium cyclone, coarse coal slurry TBS separation, fine coal slurry flotation; or whole system Simplify the process with the emerging “1+1” coking coal;

3 Coal preparation plant for easy selection of coal: using jigging and coal slurry flotation process, or de-fluid pressureless feed medium-weight cyclone and slime flotation process; or the system is completely selected for washing.

(2) In recent years, the rapid development of thermal coal preparation plant, and the plant type has gradually become larger, and the thermal coal selection plant is still the focus of development in Shanxi Province in the next few years. Due to the low price of the products, the thermal coal preparation plant strives to adapt to the changes in market demand in order to achieve the best economic benefits, with a large plant type, simple process, flexible process and various varieties.
in particular:

1 Large-scale coal preparation plant: use large block (greater than 50mm) heavy medium sorting machine or moving sieve jig exhausting, 50~13(6)mm grain-level heavy medium cyclone or jigging, slime spiral Separation machine sorting; for the bituminous coal with higher strontium content, it can be used in the joint selection process of lump coal moving sieve (or shallow trough heavy medium) and mixed coal dry selection;

2 small and medium-sized coal preparation plant: use more than 25mm moving sieve jig or composite dry coal separator sorting; or 150~13mm jigging, slime spiral sorting machine sorting process;

3 For the dynamic coal sorting plant that only sorts lump coal, it is not necessary to use the moving sieve jig, jig, lump heavy medium sorting machine and compound dry sorting machine to meet the requirements of various indicators. More complicated sorting process.

Conclusion

This article is the result of careful investigation of coal preparation plants in various parts of Shanxi Province. It selects several of the most mainstream coal preparation technologies in China and provides technical support to coal preparation plants in various parts of Shanxi to help the coal preparation plants in the domestic coal market. Get the best economic benefits for your business.

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