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A kind of technology that lime replaces liquid caustic soda to carry out alkaline reaction in rare earth smelting

A technology for replacing liquid and lime, applied in the direction of improving process efficiency, can solve the problems of difficult recovery of fluorine and large waste water discharge, and achieve the effects of comprehensive utilization, water-free discharge and simple operation.

Inactive Publication Date: 2019-08-27
四川英创环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of large amount of waste water discharge and difficult recovery of fluorine caused by water washing out of fluorine in the existing bastnaesite or mixed rare earth ore smelting process. The process of alkali reaction with liquid caustic soda

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 200g of oxidatively roasted bastnasite or mixed rare earth concentrate and put it in a 2L flat-bottomed beaker, and add 0.3N hydrochloric acid to react for 2 hours to obtain rare earth chloride feed solution and No. 1 residual residue. Transfer to the reaction kettle, add 20g lime and 0.2g potassium chloride, stir and react for 8 hours to obtain No. Ⅱ residual residue, then add 0.8N hydrochloric acid to the No. Ⅱ residual residue, react for 2 hours to obtain rare earth chloride feed liquid and No. Ⅲ residual slag, after flotation and separation of No. Ⅲ residual slag, 30g of fluorite (purity 92.8%) and 102g of cerium enrichment (REO60%) were obtained. The fluorite and cerium enrichment met the quality standards (purity, appearance, chemical index).

Embodiment 2

[0029] Take 300g of bastnaesite or mixed rare earth concentrate after oxidative roasting and put it in a 2L flat-bottomed beaker, and add 0.3N hydrochloric acid to react for 2 hours to obtain rare earth chloride feed solution and No. 1 residual residue. Transfer to the reaction kettle, add 36g lime and 0.4g potassium chloride, stir and react for 8 hours to obtain No. Ⅱ residual residue, then add 0.8N hydrochloric acid to the No. Ⅱ residual residue, react for 2 hours to obtain rare earth chloride feed liquid and No. Ⅲ residual slag, after the No. Ⅲ residual slag was separated by flotation, 45g of fluorite (purity 92.5%) and 156g of cerium enrichment (REO60%) were obtained. The fluorite and cerium enrichment met the quality standards (purity, appearance, chemical index).

Embodiment 3

[0031] Take 400g of oxidatively roasted bastnaesite or mixed rare earth concentrate and place it in a 2L flat-bottomed beaker, and add 0.3N hydrochloric acid to react for 2 hours to obtain rare earth chloride feed solution and No. 1 residual slag. Transfer to the reaction kettle, add 60g lime and 0.4g potassium chloride, stir and react for 8 hours to obtain No. Ⅱ residual residue, then add 0.8N hydrochloric acid to the No. Ⅱ residual residue, react for 2 hours to obtain rare earth chloride feed liquid and No. Ⅲ residual slag, after flotation and separation of No. Ⅲ residual slag, 59g of fluorite (purity 93.2%) and 198g of cerium enrichment (REO60%) were obtained. The fluorite and cerium enrichment met the quality standards (purity, appearance, chemical index).

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Abstract

A process for conducting an alkaline reaction through lime instead of liquid caustic soda in rare earth smelting includes the following steps that (1) bastnaesite obtained after oxidizing roasting ormixed rare earth ore reacts in a 0.3-0.5N hydrochloric acid system, and rare earth chloride feed liquid and residues I are obtained; (2) the residues I are transferred into a reaction kettle, the lime, water and catalysts are added for reaction, and residues II are obtained; (3) hydrochloric acid is added into the reaction kettle, the residues II react in a 0.8-1N hydrochloric acid system, and rare earth chloride feed liquid and residues III are obtained; and (4) flotation separation is conducted on the residues III, and fluorite and cerium rich concentrate are obtained. The liquid caustic soda is replaced with the lime, fluorine is converted into the fluorite, the step of defluorination conducted through water washing can be omitted, no water is drained, and the problems that the waste water drainage quantity is large and fluorine is unlikely to be recovered in an existing rare earth ore smelting process are solved; and meanwhile, comprehensive utilization of fluorine resources can beachieved, and the comprehensive economic benefits of the bastnaesite or mixed rare earth ore are greatly improved.

Description

technical field [0001] The invention belongs to the field of rare earth hydrometallurgy, and particularly relates to a process for performing alkali reaction by replacing lime with liquid alkali in rare earth smelting. Background technique [0002] Hydrometallurgy is the process of chemical treatment or organic solvent extraction, separation of impurities, and extraction of metals and their compounds from metal mineral raw materials in an aqueous solution of acidic or alkaline medium. At present, bastnaesite and mixed rare earth ore after oxidative roasting in the rare earth industry are basically smelted by hydrochloric acid leaching, alkali reaction, water eluting F, and hydrochloric acid leaching. However, the disadvantage of this process is that after using liquid alkali for alkali reaction, fluorine needs to be eluted by a large amount of water, the discharge of waste water is large, and the recovery and treatment of fluorine is difficult. SUMMARY OF THE INVENTION ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/10C22B1/02C22B59/00
CPCC22B1/02C22B3/10C22B59/00Y02P10/20
Inventor 不公告发明人
Owner 四川英创环保科技有限公司