A method for reducing ash content in high ash coal slime

Abstract

A method for reducing ash in inferior slime comprises the following steps: evenly spreading high ash slime in a slime pool to make the thickness of the spread high ash slime be 5-12cm, ditching, loosening the slime by using a hoe, and sprinkling water; carrying out degermation and detoxification treatment on plant seeds, immersing the treated seeds in clear water for 12-15h, and accelerating germination for 1-2d; sowing the germination accelerated seeds according to the line width of sowing lines of 30-50cm, sprinkling water once every 2-3 days, culturing at 25-30DEG C, continuously culturing for 1-2 months after germination to form bud seedlings, and carrying out regular sampling and testing on the high ash slime in the culture period; completely pulling up the bud seedlings, screening out bud seedling roots, and carrying out water sprinkling culture for 1d; and removing the slime out of the slime pool to obtain an empty slime pool used for next batch of slime treatment. The method has the advantages of simple operation, low cost, obvious reduction of the ash content and the sulfur content of treated slime, and no pollution to environment in the treatment process, and the produced slime can be directly applied in the industrial field.

Description

technical field [0001] The invention relates to the technical field of coal processing, in particular to a method for reducing ash in high-ash coal slime. Background technique [0002] Coal slime generally refers to the semi-solid formed by pulverized coal containing water. It is a product in the coal production process. According to different varieties and different formation mechanisms, coal slime can be divided into the following three categories: [0003] (1) Flotation tailings in coking coal preparation plants: the properties of this type of coal slime are similar to those of washed gangue or medium coal, with higher ash content and lower calorific value; [0004] (2) Coal slime produced by coal-water mixture: such as the coal slime produced in thermal coal washing plants and the coal slime produced after hydraulic transportation of coal. Some of this kind of slime are of better quality than raw coal, and they are often mixed with in finished coal; [0005] (3) Coal s...

AI Technical Summary

Problems solved by technology

[0006] Coal slime can be divided into three categories according to ash content and calorific value: low ash content slime, medium ash content slime and high ash content coal slime. The flotation tailings of coking coal preparation plants generally belong to medium and high ash content coal slimes, and their ash content is large. It accounts for about 35% to 40%, and its calorific value generally reaches 13.0 to 14.0MJ / kg, so that it cannot be effectively used in industrial fields