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Method for preparing potassium phosphate octahydrate combined with sodium sulfate decahydrate by alum sludge

A technology of sodium sulfate decahydrate and potassium phosphate is applied in the field of preparing potassium phosphate octahydrate and sodium sulfate decahydrate by alum slurry, which can solve the problems of secondary pollution, no mature examples of industrial utilization of alum slurry, etc. Simple to use effects

Inactive Publication Date: 2011-09-14
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 phosphate octahydrate combined with sodium sulfate decahydrate by alum sludge
  • Method for preparing potassium phosphate octahydrate combined with sodium sulfate decahydrate by alum sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] refer to figure 1 , a method for preparing potassium phosphate octahydrate and co-producing sodium sulfate decahydrate with alum slurry, the alum slurry is packed into a reaction tank one (1), fully stirred for 0.5-2 hours after adding water to make it dissolve in water, and then through a filter (2) filter to obtain filter cake and filtrate, and filter cake is through other technology 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 make sulfuric acid in reaction tank The quality of iron is 400kg, and the quality of aluminum sulfate is 171kg, and the quality of potassium sulfate is 87kg, according to the ratio of aluminum sulfate and sodium phosphate pure substance quality, be 1: 3.52 in reaction tank two (3), drop into sodium phosphate solution, slowly Reaction under the stirring of getting aluminum phosphate precipitation, ferric phosphate octahydrate precip...

Embodiment 2

[0027] refer to figure 1 , a method for preparing potassium phosphate octahydrate and co-producing sodium sulfate decahydrate with alum slurry, the alum slurry is packed into a reaction tank one (1), fully stirred for 0.5-2 hours after adding water to make it dissolve in water, and then through a filter (2) filter to obtain filter cake and filtrate, and filter cake is through other technology 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 make sulfuric acid in reaction tank The quality of iron is 400kg, and the quality of aluminum sulfate is 171kg, and the quality of potassium sulfate is 87kg, according to the ratio of aluminum sulfate and sodium phosphate pure substance quality, be 1: 3.72 in reaction tank two (3), drop into sodium phosphate solution, slowly Reaction under the stirring of getting aluminum phosphate precipitation, ferric phosphate octahydrate precip...

Embodiment 3

[0031] refer to figure 1, a method for preparing potassium phosphate octahydrate and co-producing sodium sulfate decahydrate with alum slurry, the alum slurry is packed into a reaction tank one (1), fully stirred for 0.5-2 hours after adding water to make it dissolve in water, and then through a filter (2) filter to obtain filter cake and filtrate, and filter cake is through other technology 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 make sulfuric acid in reaction tank The quality of iron is 400kg, and the quality of aluminum sulfate is 171kg, and the quality of potassium sulfate is 87kg, according to the ratio of aluminum sulfate and sodium phosphate pure substance quality, be 1: 2.82 in reaction tank two (3), drop into sodium phosphate solution, slowly Reaction under the stirring of getting aluminum phosphate precipitation, ferric phosphate octahydrate precipi...

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Abstract

The invention provides a method for preparing potassium phosphate octahydrate combined with sodium sulfate decahydrate by alum sludge; alum sludge is fully dissolved in water and filtered, and the filtrate is a mixture of potassium sulfate, aluminum sulfate and ferric sulfate; the filtrate is allowed to react with sodium phosphate to obtain a mixture of aluminum phosphate precipitates, ferric phosphate octahydrate precipitates, potassium phosphate octahydrate and sodium sulfate decahydrate, and the mixture is filtered to obtain a filter cake of aluminum phosphate and ferric phosphate octahydrate and a filtrate of potassium phosphate octahydrate and sodium sulfate decahydrate; the filtrate is distilled at a reduced pressure to become a saturated solution, and because of the different freezing points of potassium phosphate octahydrate and sodium sulfate decahydrate, the saturated solution is cooled gradually from a high temperature to a low temperature so as to perform crystallization and to precipitate potassium phosphate octahydrate and sodium sulfate decahydrate in turn; the precipitates are filtered and dried to obtain a potassium phosphate octahydrate product and a sodium sulfate decahydrate product respectively. The method prepares potassium phosphate octahydrate and sodium sulfate decahydrate by alum sludge through simple processing, makes full use of the potential value of alum sludge, does not produce secondary pollution, and is an economical and applicable method with the capability to change waste into valuables.

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 phosphate octahydrate and co-producing sodium sulfate decahydrate with alum slurry. Background technique [0002] Alum, also known as potassium aluminum alum, potassium alum and potassium alum, has a chemical formula of K2SO4 Al2(SO4)3 24H2O or KAl(SO4)2 24H2O. It is a double salt of potassium aluminum sulfate containing crystal water and is easily soluble in water. When dissolved in water, it will be hydrolyzed to produce aluminum hydroxide colloidal precipitate, and lose crystal water when heated to form white powder, which is called burnt alum. [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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C01D5/06
Inventor 王嘉兴
Owner 汪晋强