Process for preparing aluminum ammonium sulfate by crystallizing two-stage leaching raffinate

Abstract

The invention discloses a process for preparing aluminum ammonium sulfate by crystallizing two-stage leaching raffinate, wherein the process comprises the following steps: (1) adding ammonium sulfateinto the raffinate to carry out ammonium-aluminum reaction, and crystallizing to obtain an aluminum ammonium sulfate crude product; (2) adding a dissolving solution into the aluminum ammonium sulfatecrude product for dissolving, filtering, and carrying out vacuum crystallization to obtain a purer aluminum ammonium sulfate crude product; and (3) adding deionized water into the purer aluminum ammonium sulfate crude product for dissolving, and freezing and crystallizing to obtain the pure aluminum ammonium sulfate product. The ammonium-aluminum reaction is carried out to obtain the aluminum ammonium sulfate crude product; then vacuum crystallization and filtration are carried out to obtain the aluminum ammonium sulfate crude product with the purity of 80% or above; and finally, freezing, crystallizing and filtering are carried out to obtain the aluminum ammonium sulfate product with the concentration of about 99%. Therefore, aluminum in the two-stage leaching raffinate is effectively recycled, and the recycled aluminum ammonium sulfate crude product is further purified to meet the requirements of industrial use.

Description

technical field [0001] The invention belongs to the technical field of titanium ore recovery and utilization, and in particular relates to a process for preparing ammonium aluminum sulfate by crystallization of a second-stage leaching raffinate. Background technique [0002] After the titanium is extracted in the second leaching solution, the content of titanium and iron in the solution is low, which is beneficial to the preparation of aluminum ammonium sulfate with higher purity. Prior art by adding (NH 4 ) 2 SO 4 Carry out ammonium-aluminum reaction, after the reaction, feed the liquid into the crystallizer for aluminum ammonium sulfate crystallization, but the aluminum ammonium sulfate crystal prepared in this way is a crude product of aluminum ammonium sulfate, which contains many impurities, so it is necessary to study a aluminum ammonium sulfate crystallization , Purification process. Contents of the invention [0003] The invention provides a process for prepari...

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Problems solved by technology

Prior art by adding (NH 4 ) 2 SO 4 Carry out ammonium-aluminum reaction, after the reaction, feed the liquid into the crystallizer for aluminum ammonium sulfate crystallization, but the aluminum ammonium sulfate crystal prepared in this way is a crude product of aluminum ammonium sulfate, which contains many impurities, so it is necessary to study a aluminum ammonium sulfate crystallization , purification process

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