Non-quantitative washing method for low-quality coal slime

Abstract

The invention belongs to the technical field of coal slime recovery of power coal preparation plants, and particularly relates to a non-quantitative washing method for low-quality coal slime. The method comprises a raw coal screening unit, a lump coal dry-method gangue discharging unit, a pea coal sorting unit, a slack coal dry-method deep screening unit, a slack coal sorting unit, a coarse slime recycling unit, a slime water treatment unit, a fine slime filter-pressing dehydration recycling unit and a filter-pressing slime crushing and mixing unit which are sequentially arranged along the washing process. According to the method, coal slime non-landing operation can be achieved, the links of forklift transfer, automobile transportation and the like are omitted, the environmental protection problem caused by coal slime sales is thoroughly solved, the effects of coal slime landing non-quantification, commercial coal yield maximization, water resource utilization saving and economic benefit noticing are achieved, the utilization limitation of coal slime products is broken through, effective resource configuration is optimized, and the actual economic benefits of enterprises can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of coal slime recovery in steam coal preparation plants, and in particular relates to a non-quantitative washing method for low-quality coal slime. Background technique [0002] The process selection of the steam coal preparation plant is mainly based on the raw coal quality and product structure, in order to provide power plants with fuel coal that meets the requirements for calorific value and sulfur content. The common thermal coal process is: +200mm ultra-large lump coal is selectively hand-selected to remove impurities and crushed; 200-13mm lump coal is separated by dense medium shallow groove or moving sieve jigging; 13-3mm fine coal is separated There are many options, mainly including jig, two-product heavy medium cyclone and three-product heavy medium cyclone. -3mm pulverized coal is generally not put into the washing system in thermal coal preparation plants. Ignoring this kind of coal slime will ...

AI Technical Summary

Problems solved by technology

-3mm pulverized coal is generally not put into the washing system in thermal coal preparation plants. Ignoring this kind of coal slime will increase the pressure on environmental protection and lead to the inability of commercial coal to achieve the maximum capacity of the plant; and the special setting of the treatment process will lead to flotation process It is tedious and increases the cost of washing, and because tailings slime generally has high moisture content and is difficult to break, the products mixed into the main washing system are prone to agglomeration and "snowball" phenomenon, which seriously affects the actual use of users. It not only reduces the reputation of the company's products, but also increases the sales pressure, which brings many troubles to both the company and the seller.

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