A method for preparing aluminum sulfate from aluminum-containing acid treatment solution

An acid treatment, aluminum sulfate technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, alkali metal sulfite/sulfate purification, etc., can solve the problem of high process energy consumption, single product, poor economy, etc. problems, to achieve the effect of high purity, meeting market needs, and good industrial application value

Active Publication Date: 2022-05-27
CHNA ENERGY INVESTMENT CORP LTD +1
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AI Technical Summary

Problems solved by technology

However, the product of extracting aluminum from fly ash is single, the process energy consumption is high, and the economy is poor

Method used

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Experimental program
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Embodiment approach

[0043] According to a preferred embodiment of the present invention, the mass concentration of the concentrated sulfuric acid is preferably 80-98%.

[0044] According to a preferred embodiment of the present invention, the volume ratio of concentrated sulfuric acid to gel filtrate is (0.1-2):1, preferably (0.2-1):1.

[0045] According to a preferred embodiment of the present invention, the mass concentration of the concentrated sulfuric acid is 80-98%, and the volume ratio of the concentrated sulfuric acid to the gel filtrate is (0.1-2):1, preferably (0.2-1):1 .

[0046] According to the present invention, in step (3), the crude aluminum sulfate obtained in step (2) is dissolved in water, and filtered to obtain calcium sulfate and decalcification filtrate. Too little water may lead to incomplete dissolution of aluminum sulfate crystals and excessive loss. Adding too much water will dissolve a small amount of calcium sulfate and reduce the impurity removal efficiency.

[004...

Embodiment 1

[0069] 100 g of coal sample A was taken, mixed with 80 g of sodium hydroxide and 320 ml of water, and then stirred and reacted in an autoclave at 230° C. for 3 hours. After filtering and washing, adding 10wt% dilute sulfuric acid to the filter cake according to the weight ratio of acid to dry filter cake 1.4:1, leaching at 75°C for 30 minutes, filtering and washing to obtain an acidic waste liquid with a silica content of 1.5%. Gel at 60°C for 6 hours and filter to obtain silica gel and gel filtrate. According to the volume ratio of concentrated sulfuric acid (90wt%) to gel filtrate 0.6, concentrated sulfuric acid was added to the gel filtrate, and crude aluminum sulfate precipitate was obtained after one salting out. According to the volume mass ratio of water to crude aluminum sulfate 1.0, add water to dissolve crude aluminum sulfate, and filter to obtain decalcification filtrate. Filter cake calcium sulfate purity 98.3%. According to the volume ratio of concentrated sulfu...

Embodiment 2

[0071] Take 100 g of coal gangue A, mix it with 150 g of sodium hydroxide and 100 ml of water, and knead and react at 150° C. for 9 hours. Add water to dilute and cool down, filter and wash after 1 hour. Add 10wt% dilute hydrochloric acid to the filter cake at a ratio of acid to dry filter cake of 1.5:1, leaching at 60° C. for 30 minutes, and filtering to obtain an acidic waste liquid with a silica content of 10%. Gel at 20°C for 36 hours and filter to obtain silica gel and gel filtrate. According to the volume ratio of concentrated sulfuric acid (90 wt%) to the gel filtrate of 0.3, concentrated sulfuric acid was added to the gel filtrate to obtain crude aluminum sulfate. According to the volume mass ratio of water to crude aluminum sulfate 2.0, add water to dissolve crude aluminum sulfate, and filter to obtain decalcification filtrate. Filter cake calcium sulfate purity 98.2%. According to the volume ratio of concentrated sulfuric acid (90 wt%) to gel filtrate 0.3, concent...

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Abstract

The invention provides a method for preparing aluminum sulfate from an aluminum-containing acid treatment solution, the method comprising: (1) gelling the aluminum-containing acid treatment solution, and filtering and separating to obtain a gel and a gel filtrate; (2) Add concentrated sulfuric acid in the gel filtrate, once salting out crystallization obtains thick aluminum sulfate; (3) thick aluminum sulfate is dissolved in water, filters to obtain calcium sulfate and decalcification filtrate; (4) adds concentrated sulfuric acid in decalcification filtrate, two High-purity aluminum sulfate is obtained by secondary salting-out crystallization; (5) evaporation and concentration of the secondary salting-out crystallization filtrate is obtained to obtain high-purity sodium sulfate precipitate. The invention develops a comprehensive treatment and resource utilization method for the acid treatment waste liquid of minerals, especially the acid treatment waste liquid of the coal acid-base ash removal method. With this technology, alumina can be effectively extracted and aluminum sulfate can be prepared to meet the needs of the market. It has very good industrial application value.

Description

technical field [0001] The present invention relates to a method for preparing aluminum sulfate from an acid treatment liquid containing aluminum. Background technique [0002] The energy structure of relatively abundant coal and relatively poor oil and natural gas determines that China's energy consumption is dominated by coal. Thermal coal and coking coal are the main uses of coal, and other uses include coal for chemical industry and building materials. Although the proportion of coal in primary energy consumption has shown a downward trend in recent years, the total consumption in 2015 was still 3.965 billion tons, accounting for more than 62.3%. In the next few decades, the status quo of coal as the main body of national primary energy consumption will not fundamentally change. [0003] The types of coal in China are complex, the coal quality is generally poor, and the ash content is high. After years of mining, the coal quality continues to decline. For coal refinin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/743C01F7/748C01D5/16C01F11/46
CPCC01F7/743C01F7/748C01D5/16C01F11/46C01P2006/80
Inventor 赵利军李文华郭屹陈爱国靳凡
Owner CHNA ENERGY INVESTMENT CORP LTD
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