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New method for producing potassium alum

A technology of potassium alum and a new method, which is applied in the field of production of potassium alum, can solve the problems of difficult separation of impurity elements, large color difference in product appearance, and difficult control of product color, etc., achieve high dehydration yield, save steam consumption, and improve product quality. The effect of appearance

Active Publication Date: 2012-12-12
HENGYANG JIANHENG IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need for steam concentration, the production cycle is long, the yield is low, and the energy consumption is high. With the continuous mining of natural alunite deposits, the resources are getting less and less, the mining cost is also increasing, and the production cost is also very high.
The chemical synthesis method uses a single bauxite to produce synthetic potassium alum. The chemical synthesis method has the disadvantages of high energy consumption, large steam consumption, large color difference in product appearance, difficult separation of impurity elements, and difficulty in controlling the color of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of new method of producing potassium alum, its process step is as follows: 2.7 tons of aluminum oxide content Al 2 o 3 ≥37wt.%, 60 mesh 80% sieved bauxite powder and 1.65 tons of water are placed in a pressure-resistant and acid-resistant reaction pot, and then 1.41 tons of 98 wt.% sulfuric acid are added to the reaction pot. To carry out the reaction, the temperature is raised to 145-155°C, the pressure reaches 0.25-0.35 MPa, and the reaction is maintained for 4.5 hours. The internal pressure in the reaction pot is used to transport the reactants to the settling pot for washing and precipitation, and the intermediate product aluminum sulfate solution is obtained; Add 2.05 tons of aluminum sulfate solution to another acid-resistant reaction pot, put in 0.50 tons of industrial aluminum hydroxide, and stir, add 0.96 tons of 98 wt.% concentrated sulfuric acid to react, and when the reaction is complete, add 0.85 Tons of potassium sulfate, after dissolving and react...

Embodiment 2

[0019] A kind of new method of producing potassium alum, its process step is as follows: 2.7 tons of aluminum oxide content Al 2 o 3 ≥37wt.%, 60 mesh 80% sieved bauxite powder and 1.65 tons of water are placed in a pressure-resistant and acid-resistant reaction pot, and then 1.41 tons of 98 wt.% sulfuric acid are added to the reaction pot. To carry out the reaction, the temperature is raised to 145-155°C, the pressure reaches 0.25-0.35 MPa, and the reaction is maintained for 4 hours. The internal pressure in the reaction pot is used to transport the reactants to the settling pot for washing and precipitation, and the intermediate product aluminum sulfate solution is obtained; Add 2.05 tons of aluminum sulfate solution to another acid-resistant reaction pot, put in 0.40 tons of industrial aluminum hydroxide, and stir, add 0.77 tons of 98 wt.% concentrated sulfuric acid to react, and when the reaction is complete, add 0.68 1 ton of potassium sulfate, after dissolving and reacti...

Embodiment 3

[0021] A kind of new method of producing potassium alum, its process step is as follows: 2.7 tons of aluminum oxide content Al 2 o 3 ≥37wt.%, 60 mesh 80% sieved bauxite powder and 1.65 tons of water are placed in a pressure-resistant and acid-resistant reaction pot, and then 1.41 tons of 98 wt.% sulfuric acid are added to the reaction pot. To carry out the reaction, wait for the temperature to rise to 145-155°C and the pressure to reach 0.25-0.35MPa, keep the reaction for 4-5 hours, use the internal pressure in the reaction pot to transport the reactants to the settling pot for washing and precipitation, and obtain the intermediate product aluminum sulfate solution; add 2.05 tons of aluminum sulfate solution in another acid-resistant reaction pot, put in 0.60 tons of industrial aluminum hydroxide, and stir, add 1.15 tons of 98 wt.% concentrated sulfuric acid to react, and wait until the reaction is complete. Add 1.02 tons of potassium sulfate, after the dissolution reaction, ...

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Abstract

The invention relates to a new method for producing potassium alum. The method comprises the following process steps: carrying out a pressurized reaction of bauxite and sulfuric acid to obtain an aluminum sulfate solution; adding a certain amount of the aluminum sulfate solution to an acid resistance normal pressure reactor; adding a proper amount of aluminum hydroxide under stirring; adding a certain amount of concentrated sulfuric acid into the reactor; adopting dilution heat of the concentrated sulfuric acid and reaction heat of the aluminum hydroxide to carry out the complete reaction; and adding a proper amount of potassium sulfate, carrying out a reaction, and carrying out sedimentation, wherein the mother liquid is transferred to a crystallization tank to carry out crystallization. According to the present invention, the aluminum hydroxide is introduced to the raw materials, and the bauxite and the aluminum hydroxide are combined so as to greatly improve product appearance, improve product quality, reduce bauxite residue production, and reduce influence on the environment; and heat emission of the reaction of the aluminum hydroxide and the concentrated sulfuric acid can be completely utilized, external steam is not required, and the potassium alum crystal is naturally dried without further drying so as greatly save steam consumption, reduce energy consumption cost, and provide characteristics of high product purity, high density, high dehydration yield, and the like.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a new method for producing potassium alum. Background technique [0002] Potassium alum, chemical name potassium aluminum sulfate, molecular formula KAl(SO 4 ) 2 12H 2 O, is a colorless transparent geometric octahedral crystal, heated to 200 ° C, dehydrated into anhydrous white powder, after dehydration is burnt alum, odorless, slightly sweet and astringent taste. Potassium Aluminum Sulfate is an acidic salt, and is mainly used as a loosening agent to neutralize alkalinity in the food industry. Potassium aluminum sulfate reacts slowly with sodium bicarbonate and generates gas, reducing alkalinity can make food crispy. Aluminum potassium sulfate has a strong astringent effect and can be used as a medicine. Used for pickling and processing of jellyfish, whitebait and other seafood. It can be used in moderation in fried food, aquatic products, soybean products, bakin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/76
Inventor 何朝晖何青峰
Owner HENGYANG JIANHENG IND DEV
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