Process for recycling aluminum, potassium and gallium by quickly reducing and desulfurizing alunite at high temperature

Abstract

The invention discloses a process for recycling aluminum, potassium and gallium by quickly reducing and desulfurizing alunite at high temperature. The process comprises the following steps: roasting and dehydrating alunite ore powder at a certain temperature and within a certain time period to obtain alunite clinker; uniformly mixing with solid reductant coal according to a certain ratio, and carrying out fast high-temperature reduction roasting on alunite clinker the at a certain high temperature to realize desulfuration; extracting potassium from desulfurized calcine through water leaching, removing residual sulphur from the calcine; carrying out evaporative crystallization on water leaching solution to obtain a national standard product potassium sulfate; dissolving out aluminum and a small amount of potassium and metal gallium from water leaching residuals by a low-temperature low-alkali Bayer method; performing seed precipitation on leachate for recycling aluminum oxide, returning a seed precipitation mother solution to the dissolution process; regularly performing carbon decomposition on a part of the leachate for recycling the aluminum, potassium and gallium to obtain aluminum oxide, carbonate potassium and sodium carbonate and gallium-enriched precipitates, wherein the leaching residuals obtained through the low-temperature low-alkali Bayer method can be used as silicon raw materials for building products.

Description

technical field

[0001] The invention belongs to the technical field of nonferrous metal metallurgy, and relates to a new process for comprehensively recovering aluminum, potassium and gallium from alunite ore. Background technique

[0002] With the continuous development of the alumina industry, natural bauxite resources are decreasing day by day, so it is particularly important to study the use of non-bauxite aluminum resources such as alunite to produce alumina. The former Soviet Union, Mexico, etc. paid more attention to the research and promotion of the technology of extracting alumina by using alunite non-bauxite resources, and a large number of research results have been obtained and promoted in practice. my country's alum stone reserves rank third in the world, and it has been found that the alum stone reserves are more than 300 million tons. Among them, Zhejiang's mineral reserves rank first in the country, with a total of 234 million tons of proven reserves and 223...

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