Method for preparing low-ash and low-sulfur coal-water slurry by using coal slurry

A technology of coal water slurry and coal slime, which is applied in the field of clean coal, can solve the problems of poor comprehensive utilization of coal slime, environmental pollution, low utilization efficiency of coal slime, etc., and achieve efficient recovery and utilization, improve product quality, and high recovery rate Effect

Active Publication Date: 2016-10-26
重庆长能环境科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of low coal slime utilization efficiency in the prior art, to obtain low-sulfur and low-ash flotation clean coal by deep flotation of coal slime, and then pr

Method used

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  • Method for preparing low-ash and low-sulfur coal-water slurry by using coal slurry
  • Method for preparing low-ash and low-sulfur coal-water slurry by using coal slurry
  • Method for preparing low-ash and low-sulfur coal-water slurry by using coal slurry

Examples

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Embodiment 1

[0065] The coal slime was taken from a coal washing plant in Panxian County, Guizhou Province (ash content 39.6%, water content 9.5%, sulfur content 0.95%).

[0066] Step (1): Coal Slurry Slurry Treatment

[0067] After the coal slime is slurried with water, it is classified and ball milled to obtain a slurry with a solid content of 50%. The -0.074mm particles in the slurry account for 85% of the total mass of the solid part of the slurry;

[0068] Step (2): Flotation

[0069] Add the ore pulp that water adjustment step (1) makes, and the solid content of the ore pulp (addressed ore pulp) after adjustment is 31%, then adds flotation reagent by figure 2 The multi-stage flotation of the "one rough - two sweep - five fine" depth flotation process is shown.

[0070] During the flotation process, after roughing, the rougher concentrate is subjected to 5-stage series selection, and the rougher tailings are subjected to 2-stage series selection;

[0071] In beneficiation, the sel...

Embodiment 2

[0084]The coal slurry sample was taken from the dense pool bottom flow of a coal washing plant in Panxian County, Guizhou Province, with a water content of 65.4%, an ash content of 41.25% (dry basis), and a sulfur content of 1.25% (dry basis).

[0085] Step (1): After the raw coal slurry is classified-grinding, the grinding fineness is controlled to be -0.074mm, accounting for more than 78%; the solid content of the slurry after grinding is 28.8%;

[0086] Step (2): the ore pulp of step (1) is adjusted with water, makes the solid content in the selected ore pulp obtained be 25%, press subsequently image 3 The "one rough - one sweep - four fine" deep flotation process is shown. During the flotation process, after roughing, the roughing concentrate is subjected to 5-stage series selection, and the roughing tailings are subjected to 2-stage series selection;

[0087] Described flotation agent is sodium carbonate (flotation regulator), sodium hexametaphosphate, CMC (inhibitor), 0...

Embodiment 3

[0094] Compared with Example 2, the difference is that in step (4), 300 g / t of dispersant polycarboxylate (commercially available polycarboxylate water-reducer) is added to the coal fines filter cake, and a twin-shaft agitator is used to pre-stir for 60 min , and then vigorously stirred for 180 min at a stirring speed of 800 rpm to form a slurry with a certain fluidity (viscosity of 1120 mPa·s).

[0095] In step (5), 100 g / t of polyvinyl alcohol as a stabilizer is added to the slurry obtained in step (4), and the stirring and homogenization are continued for 30 minutes to obtain the final coal water slurry product. After testing, the concentration of the coal-water slurry product is 65.7%, the ash content of the coal-water slurry base is 5.35%, the sulfur content is 0.45%, the fluidity is good, the viscosity of the coal-water slurry is 1120mPa·s, and no hard precipitation occurs after standing for 72 hours. According to calculations, 1 ton of coal slurry with a water content o...

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Abstract

The invention discloses a method for preparing low-ash and low-sulfur coal-water slurry by using coal slurry. The method comprises the following steps: step (1), after adding water in the coal slurry and slurrying, carrying out classifying and ball-milling treatment to obtain ore pulp with the solid content of 40-60%, wherein 0.074 mm particles in the ore pulp accounts for the total weight of a solid part by 70% or above; step (2), adding water to adjust the solid content of the ore pulp prepared in the step (1) to be 15-45%, then adding a floating agent to carry out multi-stage floating, and collecting flotation coal concentrate; step (3), carrying out filter pressing treatment on the flotation coal concentrate prepared in the step (2), wherein the water content of a filter cake obtained by filter pressing is 28%-38%; step (4), stirring and dispersing the filter cake obtained in the step (3) and a dispersing agent into slurry, and controlling the viscosity of the slurry to be smaller than or equal to 1,200 mPa.s; step (5), feeding a stabilizer and a pH regulator in the slurry obtained in the step (4), and continuing stirring and homogenizing to obtain the low-ash and low-sulfur coal-water slurry. By the method, the added value of products can be greatly increased, the coal slurry can be efficiently and cleanly utilized, and the economic benefit and the environment benefit are remarkable.

Description

technical field [0001] The invention relates to the technical field of clean coal, in particular to a method for preparing low-ash and low-sulfur coal-water slurry by deep flotation of coal slime. Background technique [0002] The fossil energy endowment conditions of "rich coal, poor oil, and little gas" and the historical process of renewable energy technology breakthroughs determine that my country's energy consumption structure must be dominated by coal. Driven by the rapid development of the macro economy in the past ten years, coal Demand continued to increase significantly, and coal production increased from 1.47 billion tons in 2002 to 3.87 billion tons in 2014, accounting for 76.5% and 66.6% of the primary energy production and consumption structure, accounting for 100% of the total global coal production and consumption. 47.5% and 50.2% (2013-2014 "BP World Energy Statistical Yearbook"), the contribution rate to my country's national economic aggregate and increment ...

Claims

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Application Information

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IPC IPC(8): C10L1/32
CPCC10L1/326
Inventor 符剑刚陈钰吴凯李政
Owner 重庆长能环境科技有限公司
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