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

A technology of aluminum ammonium sulfate and two-stage leaching, which is applied in the direction of aluminum sulfate, aluminum compounds, aluminum sulfur compounds, etc.

Active Publication Date: 2020-10-02
雅安市鑫辉矿业有限公司 +2
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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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  • Process for preparing aluminum ammonium sulfate by crystallizing two-stage leaching raffinate

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[0057] like figure 1 It can be seen that after titanium is extracted by the second-stage leaching solution, the content of titanium and iron in the solution is low, which is conducive to the preparation of aluminum ammonium sulfate with higher purity. Heat the leaching solution to 80°C, and add (NH 4 ) 2 SO 4 Carry out ammonium-aluminum reaction, maintain the reaction temperature at 80°C, and the reaction time is 30 minutes. After the reaction, feed the liquid into the crystallizer to crystallize aluminum ammonium sulfate, and then filter to obtain the crude product of aluminum ammonium sulfate crystallization. Ammonium Aluminum Sulfate crystallization crude product purification is carried out twice, adopts vacuum crystallization (i.e. a recrystallization) for the first time, the vacuum tightness of control system is 2400Pa, crystallization time is 60min, filters and obtains the thick product of Ammonium Aluminum Sulfate more than 80%, Freeze crystallization (i.e. secondary...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/76
CPCC01F7/765C01P2006/80Y02P10/20
Inventor 穆宇高利坤张裕书张少翔张新良蒋朋陈超刘能云
Owner 雅安市鑫辉矿业有限公司
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