Chloridizing roasting method of material containing alunite

A technology of chlorinated roasting and alumite is applied in the application field of alumite mining enterprises, can solve the problems of low purity of crude potassium salt, poor economic benefit, increased alkali consumption, etc., and achieves high comprehensive utilization rate of resources, low production cost, economical high-efficiency effect

Inactive Publication Date: 2010-07-28
ZIJIN MINING GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former Soviet Union used sulfur reducing agent for industrial production. Although the product yield is high and there are few corrosion problems, it can decompose SO in alunite. 3 Difficult to extract the problem, that is, in the reduction pyrolysis-alkali method, because it is necessary to take into account the Al 2 o 3 Alkaline leaching activity, this part of SO 3 It is impossible to decompose completely, so it increases the alkali consumption and affects the content of potassium sulfate in the product potash fertilizer
In order to solve this pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 500g of alunite-containing tailings, add 50g of industrial potassium chloride, mix well, put it into a muffle furnace, roast at a temperature of 600°C, and roast for 5 hours. During the roasting process, recover and weigh the volatilized AlCl 3 , HCl and other acidic gases in the flue gas are absorbed with lye, the roasted clinker is leached with water, the leaching solution is evaporated, crystallized and recovered K 2 SO 4 , the leaching residue was recovered by conventional stripping method 2 o 3 . The analysis results show that the dehydration rate of alunite tailings reaches 93.3%, and the Al 2 (SO 4 ) 3 into AlCl 3 The conversion rate of K 2 SO 4 The recovery rate of 168.9% (due to producing new K in the reaction process 2 SO 4 ), during conventional Bayer stripping, Al 2 o 3 The relative dissolution rate was 74.2%.

Embodiment 2

[0029] Weigh 500g of alunite-containing tailings and add 150ml of industrial brine containing 180.7g / L of chlorine to form a dough. The brine contains various soluble chloride salts such as sodium chloride, potassium chloride, calcium chloride and magnesium chloride. After the agglomerate is dried, put it into the muffle furnace and roast at 300°C for 5 hours, recover and weigh the volatilized AlCl during the roasting process 3 , HCl and other acid gases in the flue gas are absorbed with lye. The roasted clinker is leached with water, the leaching solution is evaporated and crystallized to recover K 2 SO 4 , the leaching residue was recovered by conventional stripping method 2 o 3 . The analysis results show that the dehydration rate of alunite tailings reaches 90.1%, and the Al 2 (SO 4 ) 3 into AlCl 3 The conversion rate of K 2 SO 4 The recovery rate of 128.3% (due to producing new K in the reaction process 2 SO 4 ), during conventional Bayer stripping, Al 2 o 3...

Embodiment 3

[0031] Weigh 500g of alum-containing tailings, add 150g of industrial calcium chloride, mix well, put it in a muffle furnace and roast at 900°C for 0.5 hours, recover and weigh the volatilized AlCl during the roasting process 3 , HCl and other acid gases in the flue gas are directly returned to the roaster. The roasted clinker is leached with water, the leaching solution is evaporated and crystallized to recover K2 SO 4 , the leaching residue was recovered by conventional stripping method 2 o 3 . The analysis results show that the dehydration rate of alunite tailings reaches 94.1%, and the Al 2 (SO 4 ) 3 into AlCl 3 The conversion rate of K 2 SO 4 The recovery rate is 91.9%, when the conventional Bayer stripping, Al 2 o 3 The relative dissolution rate was 64.2%.

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Abstract

The invention relates to a chloridizing roasting method of a material containing alunite, which is mainly used for comprehensively utilizing the alunite or tailing containing the alunite. The method adopts chloride as an additive for roasting dehydration of the alunite or the tailing containing the alunite; under the condition that dehydration rate is more than 90%, Al existing in the mode of Al2(SO4)3 in the alunite or the tailing containing the alunite volatilizes in the mode of AlCl3 and is enriched in a woven bag dust collector or a rotoclone collector, thus avoiding environment pollution by SO2 generated by decomposing the Al2(SO4)3; acid gas in smoke, such as HCl and the like, can be adsorbed by alkaline liquor or directly returned for roasting; clinker is leached by water; and leaching agent recovers K2SO4, and leaching slag recovers Al2O3 with a common leaching method. When being used for processing the alunite or the tailing containing the alunite, the method of the invention can respectively obtain AlCl3, K2SO4 and Al2O3, has the advantages of high comprehensive utilization ratio of resources, environmental friendliness and low production cost, and is suitable for alunite enterprises.

Description

technical field [0001] The invention relates to a method for chlorinating and roasting alunite-containing materials, which is suitable for application in alunite mining enterprises. Background technique [0002] The total reserves of alunite ore in our country amount to several billion tons, most of which belong to potassium alunite. Most of the comprehensive utilization of alunite at home and abroad focuses on the extraction of aluminum, potassium, and sulfur. Dozens of processes have been studied, but they can be combined into three categories: alkali method, acid method and acid-base combined method. Typical methods include reduction pyrolysis, ammonia-soda method, Kalenite acid method, U·G method, ammonium sulfate decomposition method, thermal decomposition method, etc. At present, only the "reductive pyrolysis-alkali method" process developed by the former Soviet Union has realized industrial production. [0003] The "reduction pyrolysis-alkali method" process first d...

Claims

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Application Information

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IPC IPC(8): C22B1/08
Inventor 衷水平阮仁满邹来昌谭希发彭钦华伍赠玲黄中省甘永刚
Owner ZIJIN MINING GROUP
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