Method for preparing high-purity potassium alum and aluminum sulfate from alunite ore

A kind of technology of alunite and potassium alum, which is applied in the field of preparing high-purity potassium alum and aluminum sulfate, and can solve the problems that the gains outweigh the losses, the market volume of potassium alum is small, and the alumite ore cannot be effectively recovered.

Inactive Publication Date: 2014-05-14
ZIJIN MINING GROUP
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Problems solved by technology

This method is also adopted in the field of acid leaching-crystallization of alum stone, but the value of the added K2SO4 and other additives is far greater than the value of the potassium alum produced, and the market volume of potassium alum is small, so the method is not worth the candle.
[0006] Based on the

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  • Method for preparing high-purity potassium alum and aluminum sulfate from alunite ore
  • Method for preparing high-purity potassium alum and aluminum sulfate from alunite ore
  • Method for preparing high-purity potassium alum and aluminum sulfate from alunite ore

Examples

Experimental program
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Effect test

example 1

[0018] Example 1: Take 100g of Zijinshan associated alunite ore in a crucible and place it in a muffle furnace for roasting and dehydration at a temperature of 550°C for 2 hours. The dehydrated alum is leached under the condition of a solid ratio of 5, the leaching solution naturally crystallizes potassium alum, the crystalline potassium alum mother liquor is added with a certain amount of acid, and then returns to leaching, and the leaching solution is circulated to crystallize potassium alum, and after 3 cycles, the crystalline potassium alum mother liquor crystallizes aluminum sulfate. The dehydrated alunite cyclic leaching-crystallization test results are shown in Table 1, the purity of crystalline alum and aluminum sulfate in different cyclic leaching times of dehydrated alunite is shown in Table 2, and the multi-element analysis results of crystalline potassium alum are shown in Table 3. The results of multi-element analysis are shown in Table 4. From the results of Tabl...

example 2

[0019] Example 2: Take 100g of Zijinshan associated alunite ore, put it in a crucible and place it in a muffle furnace for roasting and dehydration at a temperature of 550°C for 1.5 hours, and then use a sulfuric acid dosage of 350kg / t alunite ore, a temperature of 70°C, and liquid-solid The dehydrated alum is leached under the condition of ratio 7, the leaching solution naturally crystallizes gallium alum, and after crystallizing potassium alum, the mother liquor is added a certain amount of acid and then returns to leaching, and the leaching solution is circulated to crystallize potassium alum, and after 4 cycles, the crystallization mother liquor crystallizes aluminum sulfate. The obtained potassium alum has a purity of 99.48%, and the Al2O3 content in the crystalline aluminum sulfate is 16.05%. The chemical detection of crystalline potassium alum and aluminum sulfate is carried out according to GB1895-2004 and HG / T2225-2001 respectively, and the indicators of potassium alum...

example 3

[0020] Example 3: Take 100g of primary alunite ore from Wenzhou Alum Mine, roast and dehydrate it in a muffle furnace at a temperature of 500°C for 1 hour, and then dehydrate it under the conditions of a sulfuric acid dosage of 300kg / t alunite ore, a temperature of 80°C, and a liquid-solid ratio of 6 Dehydrated alum is leached under the bottom, the leaching solution naturally crystallizes gallium alum, and after crystallizing potassium alum, the mother liquor is added a certain amount of acid and then returns to leaching, and the leaching solution is circulated to crystallize potassium alum. The content of Al2O3 in aluminum sulfate is 15.98%. The chemical detection of crystalline potassium alum and aluminum sulfate is carried out according to GB1895-2004 and HG / T2225-2001 respectively, and the indicators of potassium alum and aluminum sulfate meet the technical requirements of GB1895-2004 food additives and HG / T2225-2001 first-class products respectively.

[0021] Table 1 Resu...

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Abstract

The invention relates to a method for preparing high-purity potassium alum and aluminum sulfate from alunite ore. The method comprises the following steps: firstly, roasting the alunite ore to remove crystal water; secondly, performing sulfuric acid leaching on dehydrated alunite to obtain aluminum and potassium, and crystallizing the potassium alum in leaching liquid; thirdly, adding a certain quantity of acid into crystallization mother liquid, returning to a circulating leaching process, and crystallizing the potassium alum in circulating leaching liquid; and finally, crystallizing the aluminum sulfate in potassium alum crystallization mother liquid circulated for a certain number of times. The purpose of the invention is to provide the method for preparing the high-purity potassium alum and the aluminum sulfate from the alunite ore, which is simple in process, low in production cost and easy to industrialize in allusion to the comprehensive utilization problem of the alunite ore.

Description

1. Technical field [0001] The invention relates to the precious metal metallurgy industry, in particular to a method for comprehensive recovery, separation and purification of valuable metals in ores, in particular to a method for preparing high-purity potassium alum and aluminum sulfate from alunite ore. 2. Background technology [0002] my country lacks mineral resources. Al and K are important mineral resources in my country, and potassium is a scarce resource in my country. As a potential resource of Al and K, alunite ore has been paid more and more attention by research at home and abroad. At present, there is no economically and technically reasonable process for alunite comprehensive utilization at home and abroad. my country is a country with large alumite reserves, and there are a large number of primary and associated alumite mines. Wenzhou alumite mine is known as "the world's alum capital", and its alumite reserves account for 60% of the world's total reserves. ...

Claims

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Application Information

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IPC IPC(8): C01F7/76C01F7/74C22B3/06C22B21/00C22B26/10
CPCY02P10/20
Inventor 黄中省衷水平王瑞永
Owner ZIJIN MINING GROUP
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