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Method for preparing potassium carbonate, iron carbonate and co-preparing aluminum sulfate and sodium sulfate using alum paste

A technology of aluminum sulfate and potassium carbonate, applied in the direction of alkali metal sulfite/sulfite, aluminum sulfate, chemical instruments and methods, etc., can solve the problems of no mature examples of alum pulp industry utilization, secondary pollution, etc., and achieve equipment The effect of less investment and simple operation

Inactive Publication Date: 2011-08-31
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the industrial utilization of alum slurry has no mature examples at home and abroad so far.
In particular, many processes have secondary pollution while treating and utilizing the alum slurry.

Method used

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  • Method for preparing potassium carbonate, iron carbonate and co-preparing aluminum sulfate and sodium sulfate using alum paste
  • Method for preparing potassium carbonate, iron carbonate and co-preparing aluminum sulfate and sodium sulfate using alum paste

Examples

Experimental program
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Effect test

Embodiment 1

[0022] refer to figure 1 , a method for preparing potassium carbonate and iron carbonate with alum slurry to co-produce aluminum sulfate and sodium sulfate, the alum slurry is loaded into reaction tank one (1), fully stirred for 0.5-2 hours after adding water to make it dissolve in water, and then pass Filter one (2) filters, and obtains filter cake and filtrate, and filter cake is through other process deep processing, and filtrate is the mixture of potassium sulfate, aluminum sulfate and ferric sulfate; Gained filtrate is sent into reaction tank two (3), and makes reaction tank The quality of ferric sulfate in middle is 400kg, and the quality of aluminum sulfate is 171kg, and the quality of potassium sulfate is 87kg, is 1: 0.93 according to the ratio of ferric sulfate and sodium carbonate pure substance quality, throws sodium carbonate solution in reaction tank two (3), React under gentle stirring to obtain a mixture of iron carbonate precipitation, potassium carbonate, alum...

Embodiment 2

[0025] refer to figure 1 , a method for preparing potassium carbonate and iron carbonate with alum slurry to co-produce aluminum sulfate and sodium sulfate, the alum slurry is loaded into reaction tank one (1), fully stirred for 0.5-2 hours after adding water to make it dissolve in water, and then pass Filter one (2) filters, and obtains filter cake and filtrate, and filter cake is through other process deep processing, and filtrate is the mixture of potassium sulfate, aluminum sulfate and ferric sulfate; Gained filtrate is sent into reaction tank two (3), according to ferric sulfate and The ratio of pure substance quality of sodium carbonate is 1: 1.13 throws sodium carbonate solution in reaction tank two (3), reacts to obtain the mixture of ferric carbonate precipitation, salt of wormwood, aluminum sulfate and sodium sulfate solution under stirring slowly; Filter through filter two (4), obtain iron carbonate precipitation and the solution containing salt of wormwood, aluminu...

Embodiment 3

[0028] refer to figure 1, a method for preparing potassium carbonate and iron carbonate with alum slurry to co-produce aluminum sulfate and sodium sulfate, the alum slurry is loaded into reaction tank one (1), fully stirred for 0.5-2 hours after adding water to make it dissolve in water, and then pass Filter one (2) filters, and obtains filter cake and filtrate, and filter cake is through other process deep processing, and filtrate is the mixture of potassium sulfate, aluminum sulfate and ferric sulfate; Gained filtrate is sent into reaction tank two (3), according to ferric sulfate and The ratio of pure substance quality of sodium carbonate is 1: 0.642 throws sodium carbonate solution in reaction tank two (3), reacts to obtain the mixture of ferric carbonate precipitation, salt of wormwood, aluminum sulfate and sodium sulfate solution under stirring slowly; Filter through filter two (4), obtain iron carbonate precipitation and the solution containing salt of wormwood, aluminu...

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Abstract

The invention provides a method for preparing potassium carbonate, iron carbonate and co-preparing aluminum sulfate and sodium sulfate using alum paste comprising steps as: dissolving the alum paste in water and filtering to obtain a filtrate of potassium sulfate, aluminum sulfate and ferric sulfate; carrying out the reaction of the obtained filtrate and sodium carbonate to obtain the mixture of iron carbonate precipitate, potassium carbonate, aluminum sulfate and sodium sulfate solution, and filtering to obtain iron carbonate precipitate and a filtrate containing the potassium carbonate, the aluminum sulfate and the sodium sulfate; carrying out reduced pressure distillation on the filtrate, according to different freezing point between the potassium carbonate, the aluminum sulfate and the sodium sulfate, gradually cooling the saturated solution from high to low temperature, successively crystallizing out the potassium carbonate, the aluminum sulfate and the sodium sulfate, filtering and drying to obtain a potassium carbonate product, an aluminum sulfate product and a sodium sulfate product separately. The method is to use the alum paste to prepare potassium carbonate and iron carbonate and co-prepare aluminum sulfate and sodium sulfate through simple process. The method makes full use of potential value of the alum paste and do not make secondary pollution. The method is an economic and appropriate method and turns waste into wealth.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of inorganic chemical waste alum slurry, in particular to a method for preparing potassium carbonate and iron carbonate to co-produce aluminum sulfate and sodium sulfate by using alum slurry. Background technique [0002] Alum is also known as potassium aluminum alum, potassium alum and potassium alum, and its chemical formula is K 2 SO 4 ·Al 2 (SO 4 ) 3 24 hours 2 O or KAl(SO 4 ) 2 24 hours 2 O, is a double salt of potassium aluminum sulfate containing crystal water. It is easily soluble in water. When dissolved in water, it will be hydrolyzed to form a colloidal precipitate of aluminum hydroxide. [0003] Alum is widely used in chemical industry, food, daily chemical, water treatment and other industries, and its consumption is very huge. Its main production raw material is alunite, which is mainly distributed in Zhejiang, Anhui and other provinces in my country. The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00C01D5/00C01F7/74C01G49/00
Inventor 王嘉兴
Owner 汪晋强