Washing method of screening type coarse slime sorting washbox

Abstract

The invention discloses a washing method of a screening type coarse slime sorting washbox, and relates to the field of cleaning units. The method comprises the following steps that firstly, an artificial bed is laid, the thickness of the artificial bed ranges from 300 mm to 600 mm, the artificial bed is divided into a bottom layer, a middle layer and an upper layer, the thickness of the bottom layer ranges from 100 mm to 200 mm, the particle size of laid bed stone ranges from 10 mm to 12 mm, the density ranges from 2.1 g / cm3 to 3.6 g / cm3, the thickness of the middle layer ranges from 100 mm to200 mm, the particle size of laid bed stone ranges from 8 mm to 10 mm, the density ranges from 2.0 g / cm3 to 3.0 g / cm3, the thickness of the upper layer ranges from 100 mm to 200 mm, the particle sizeof laid bed stone ranges from 6 mm to 8 mm, and the density ranges from 1.8 g / cm3 to 2.5 g / cm3; secondly, valves at discharging openings in the bottom of the screening type coarse slime sorting washbox are closed, and a bottom dewatering screen of the screening type coarse slime sorting washbox is started; thirdly, a clean water pump is started to convey clean water to a main water pipe; fourthly, an electronic numerical control device is started, and various parameters of the electronic numerical control device are adjusted; and fifthly, coarse slime raw materials are conveyed to a raw material feeding opening of the screening type coarse slime sorting washbox to be prepared for washing. The washing method is simple in operation and high in adaptability, and the recovery rate can reach 95% or above.

Description

technical field [0001] The invention relates to the field of coal preparation equipment, in particular to a washing method with a sieve-type coarse coal slime sorting jig machine. Background technique [0002] With the further improvement of coal mining mechanization, there are more and more fine coals in the raw materials of coal preparation plants. In addition, secondary fine coals will be produced after crushing and other processes in the coal washing process. Because it is difficult to recycle, clean coal exists in coal slime and becomes "waste". The ash content of these coal slimes containing coarse clean coal is between 40-55%, and coarse-grained coal slime accounts for between 30-45%. At present, Domestic comprehensive utilization of these coal slimes is mainly used in power plants or coal gangue power plants for blending and distributing power generation, or stacked in the open air or buried on site, which pollutes the environment and wastes resources. [0003] In t...

AI Technical Summary

Problems solved by technology

The theoretical separation particle size range of dense medium and water medium cyclone is 50mm ~ 0.5mm, but the production practice shows that its separation accuracy for 3 ~ 0.5mm particle size material is poor; TBS, CSS, TCS and other interference bed separation The sorting machine is to mix the pulp material fed into the upper end of the sorting machine with the rising water flow, and form a relatively stable disturbed bed under the action of a certain period of time. The product flow; the density of the feed particles is higher than the average density of the bed, and the bed will pass through the bed due to its own weight, and enter the sinking flow from the tailings discharge port, so that the materials can be separated according to density; in practical applications, it is mainly aimed at 2 ~0.25mm coarse coal slime, the best sorting particle size range is 1-0.25mm (that is, the particle size ratio is 4:1), and the effective sorting density is 1.4-1.8g / cm 3 , its disadvantages are: the range of sorting particle size is narrow, if the feed particle size ratio exceeds 4 times, it will cause the loss of clean coal and cause the separation effect to deteriorate; in addition, a single rising water flow cannot form a stable interference bed, which will affect the separation effect ;The ash content of the sorted product is generally between 14-18%, and it is difficult to separate the qualified clean coal below 10% at one time; the ash content of the tailings is generally 50-60%, and 20% of the clean coal is still lost in the tailings

The spiral separator belongs to the principle of flow film separation, which relies on the characteristics of liquid flow. The coarse slime slurry is fed from the top of the spiral separator, and the coarse slime descends spirally in the spiral groove, and is driven by gravity, centrifugal force and water flow. The separation of minerals with different densities can be realized under the left and right of the force; the maximum separation size is 3mm-0.15mm; the advantage is that no power is needed, no moving parts, and it is suitable for thermal coal separation. The disadvantage is that when the separation density is low, it will affect the separation. The separation effect, the product quality is easy to fluctuate, and the separation accuracy is poor. The ash content of the sorted product is generally 14-18%, and it is difficult to sort out qualified clean coal below 10% at one time. The tailings ash content is generally 40-60%, about 20% of the clean coal is still lost in the tailings; therefore, the effective recovery of coarse coal slime can recover resources, protect the environment, reduce resource consumption, and is of great significance to the sustainable development of the coal industry. Coarse slime separation equipment and technology Innovation has become an urgent priority

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