Chloridizing roasting method of material containing alunite

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...