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Utilization method of waste liquid produced by coal chemical ash removal and coal ash removal method

A technology of coal chemistry and waste liquid, applied in chemical instruments and methods, aluminum-sulfur compounds, multi-stage treatment of water/sewage, etc., can solve the problem that waste liquid cannot be effectively and fully utilized, and achieve the effect of optimizing integration and simplifying extraction procedures

Active Publication Date: 2021-03-30
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the waste liquid produced by coal chemical ash removal cannot be effectively and fully utilized in the prior art, and to provide a method for utilizing waste liquid produced by coal chemical ash removal and a coal ash removal method

Method used

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  • Utilization method of waste liquid produced by coal chemical ash removal and coal ash removal method
  • Utilization method of waste liquid produced by coal chemical ash removal and coal ash removal method
  • Utilization method of waste liquid produced by coal chemical ash removal and coal ash removal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Production of waste liquid

[0051] Coal sample A 400 g, 700 g of potassium hydroxide and 400 ml (liquid solid weight ratio 11: 4), mixed at 120 ° C for 9 hours. Add 1L water dilution cooling, washed 1 hour, washed, resulting in a base after the alkaline method and the alkaline waste liquid. 10 wt% dilute hydrochloric acid was added to the coal after the acid ratio of 1.5: 1 was added to the ground after the gray, and 30 minutes were immersed at 60 ° C for 30 minutes, and the dried coal and acid waste liquid were obtained.

[0052] (2) Use of waste liquid

[0053] To the resulting alkaline waste liquid (amount of 50 g / l, 1L alkaline waste liquid added to 50 g of calcium hydroxide) was carried out at 75 ° C for 1 hour, and the first filter residue was filtered. (Aluminum calcium silicon mixture) and the first filtrate, in the first filter residue (aluminum calcium silicon mixture), the aluminum oxide gauge Al content is 29% by weight, with a calcium oxide gauge Ca cont...

Embodiment 2

[0059] (1) Production of waste liquid

[0060] Referring to CN1708574A, the coal sample B is 100 g, and 50 g of sodium hydroxide and 320 ml (liquid solid mass ratio 4: 1), mixed at 250 ° C, and stirred in the autoclave for 9 hours. After filtration, the alkaline waste liquid is obtained. 8 wt% dilute sulfuric acid was added to the filter cake in the filter cake, 75 ° C for 30 minutes, and the washing was obtained from the filter cake.

[0061] (2) Use of waste liquid

[0062] To the obtained alkaline waste liquid (an addition amount of 8 g / l, 1L alkaline waste solution was added to the calcium hydroxide), and the first reaction was carried out at 30 ° C for 2 hours, and the first filter residue was filtered. Calcium silicon mixture) and the first filtrate, in the first filter residue (aluminum calcium silicon mixture), with an aluminum oxide gauge Al content to 76 wt%, and the content of the calcium oxide gauge is Si content in the silica. 8WT%, recovery of the first filtrate (m...

Embodiment 3

[0071] According to the method of the method, the resource utilization of the waste liquid produced by coal chemical except ash, and calcium chloride is used for calcium hydroxide when adding calcium hydroxide to the obtained alkaline waste liquid. The remaining conditions are the same as those of Example 1.

[0072] RESULTS: The extraction rate of aluminum oxide gauge Al is 91%, and the main product of the crystallization of salting is aluminum sulfate. However, the first filtrate is a potassium chloride solution, and it is not possible to directly reuse the coal alkali method.

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Abstract

The invention relates to the field of coal chemical ash removal, and discloses a utilization method of waste liquid generated by coal chemical ash removal and a coal ash removal method. The utilization method comprises the following steps: mixing an alkaline waste liquid generated by alkaline ash removal with a calcium agent, carrying out a first reaction to obtain a first mixture, and filtering the first mixture to obtain a first filtrate and a first filter residue; mixing the first filter residue with a dilute sulfuric acid solution, carrying out a second reaction to obtain a second mixture,and filtering the second mixture to obtain a second filter residue and a second filtrate; mixing acid waste liquid generated by acid-process ash removal with the second filtrate, carrying out gelation reaction on the obtained third mixture, and filtering to obtain third filter residues and third filtrate mainly containing aluminum sulfate; and further purifying the third filtrate to obtain an aluminum sulfate product. According to the method, acid and alkali in the acidic waste liquid and the alkaline waste liquid can be efficiently recycled, and Al in the waste liquid can be effectively extracted.

Description

Technical field [0001] The present invention relates to the field of coal dehydration, and more particularly to the method of utilizing coal chemical except ash production waste liquid and coal defamated method. Background technique [0002] China's coal type is complex, the coal quality is poor, and the ash is high. After years of mining, the coal quality has declined. The content of commercial coal is high, and the average is ash is 20% to 24%, while the average ash of the power generation coal reaches 28%. In the main utilization pathway of coal, the electric coal is reduced by 1%, and the heat generation can be increased by 200-360 J / g, and the power generation standard coal consumption is reduced by 2-5 g. Coking coal ash is reduced by 1%, and the consumption of ironmaking coke is reduced by 2.66%, and the utilization factor of ironmaking blast furnace can be increased by 3.99%. Synthetic ammonia production If the washing coal is used, 20% can be coal. Coal high value-adde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L9/02C01F7/74C02F9/04
CPCC01F7/74C02F9/00C10L9/02
Inventor 赵利军李文华郭屹陈爱国靳凡
Owner CHNA ENERGY INVESTMENT CORP LTD
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