Practice and Discussion on Coal Washing Technology in Shangxi Coal Industry

According to the conclusions of many years of coal washing plants in various places, in terms of economic benefits and efficiency of coal washing process, according to the current development situation of the coal market, it is decided to adopt a composite dry cleaning coal washing for the raw coal cleaning of Shangzhuang Coal Industry, for unqualified coal For the second deep processing, it is necessary to ensure that the user can accept the quality of coal and minimize the loss of the enterprise.

After many investigations and verifications, Shangxi Coal finally decided to adopt a composite dry coal washing process. This coal washing process is a high-tech coal washing process that has emerged in recent years and decided to select Tangshan Lukai Technology Co., Ltd. Coal unit. The characteristics of the unit are very obvious. The purity of extracted coal is high, and the recovery rate of clean coal can reach 90%. These advantages are incomparable with the traditional coal washing process, which is in good agreement with the coal washing results required by the company.

1, the principle of coal preparation

The composite dry-selection unit adopts a plurality of coal preparation processes as one, mainly to screen the surface impurities in the process of turning over the material, and use the coal particles and airflow contained in the coal to generate suspension separation, and utilize the centrifugal force generated and Under the dual action of the wind, the high-density impurities in the raw coal are used for buoyancy.

The coal raw material is fed to the feed inlet of the unit by the feeder, enters the spin-bed with good precision analysis, and forms a coal seam with a certain thickness on the sorting bed surface. After the coal seam and sorting bed foundation, the inertia and vibration were received, and the organic group accompanied the upward reaction. The clean coal went down along the unit through continuous screening, and the unit baffle was peeled out to become a fine product.

Under the action of the vibration of the unit and the inertia of the coal, the continuously turning coal gradually becomes an approximate spiral movement. The small particles of coal are continuously stripped from the coal layer, and a variety of coal products with different impurities are formed. Finally, the dense impurities are from the unit discharge port.

Discharged. Under the action of the blower, on the one hand, the coal is under the action of the fan, the material layer is evenly dispersed according to the density, and the other side, the ascending airflow forms a fixed suspension layer in the micro-particles contained in the material to improve the precision of the coal and is effective. Separate other impurities from coal.

2, system design

The Lukai dry coal preparation unit selected by Shangxi Coal Industry was installed on the open space between the original washing tower and the main plant for washing. The whole station stood more than 800 square meters.

After passing through the high-frequency vibrating screen, the raw coal is transported to the coal washing unit by the belt conveyor belt. The cleaned coal after the washing is passed through the fatigue conveying station to enter the unit room, and then the unit process is installed to operate. The impurity selected by the washing has another output of the discharge belt, which falls on the coal plant. The entire coal preparation process is extremely simple and reasonable.

3, case analysis

Compound dry-selected coal washing and extensive use of coal in the northern Chinese coal market. The system is designed for the characteristics of northern coal and is very suitable for the actual characteristics of northern coal. The unit is not used much in the southern coal market, and there is no detailed data. Statistical Analysis.

Through the test of Shangxi Coal Industry for more than half a year, the coal washing effect has achieved the expected results, and the unit has been modified. The effect is very good after improvement. I hope this article will help everyone.