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Removal method for calcium and strontium impurity irons in rare earth feed liquid

A technology of rare earth material liquid and impurity ions, which is applied in the direction of improving process efficiency, etc., can solve the problems of high cost and difficulty in industrial promotion, and achieve the effects of reducing production pressure, reducing production cost, and high-efficiency separation

Inactive Publication Date: 2018-11-13
中稀(寿光)资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High cost, difficult for industrial promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 A method for removing calcium and strontium impurity ions in rare earth feed liquid

[0023] 1. Raw material preparation: the raw material used is lanthanum cerium chloride feed liquid; wherein, the concentration of lanthanum cerium chloride is 100g / L / L, and the sum of the concentration of calcium oxide and strontium oxide is 15g / L.

[0024] 2. Preparation of lye: Dissolve soda ash (sodium carbonate) in deionized water to make lye with a concentration of 80-120g / L and a temperature of 50±5°C.

[0025] 3. Add alkali and react: first add sodium carbonate solution according to the mass ratio of sodium carbonate to rare earth oxide in the feed liquid 0.85:1. Stirring reaction: heat the temperature to 49°C, continue to add sodium carbonate solution, adjust the pH value to 6.4, and the rare earth oxide concentration in the supernatant is 0.38g / L.

[0026] 4. Aging reaction: Stop stirring and age the rare earth carbonate for 60 minutes to promote crystal formation. ...

Embodiment 2

[0029] Example 2 A method for removing calcium and strontium impurity ions in rare earth feed liquid

[0030] 1. Raw material preparation: the raw material used is lanthanum chloride feed liquid; wherein, the concentration of lanthanum chloride is 110g / L / L, and the sum of the concentration of calcium oxide and strontium oxide is 15g / L.

[0031] 2. Preparation of lye: Dissolve soda ash (sodium carbonate) in deionized water to make lye with a concentration of 80-120g / L and a temperature of 50±5°C.

[0032] 3. Add alkali and react: first add sodium carbonate solution according to the mass ratio of sodium carbonate to lanthanum oxide in the feed solution 0.85:1. Stirring reaction: keep the temperature at 55°C, adjust the pH value to 6.1 with sodium carbonate solution, and the concentration of lanthanum oxide in the supernatant is 0.42g / L.

[0033] 4. Aging reaction: Stop stirring and age the rare earth carbonate for 100 minutes to promote crystal formation.

[0034] 5. Centrifug...

Embodiment 3

[0036] Example 3 A method for removing calcium and strontium impurity ions in rare earth feed liquid

[0037] 1. Raw material preparation: The raw material used is cerium chloride feed liquid; wherein, the concentration of cerium chloride is 150g / L / L, and the sum of the concentration of calcium oxide and strontium oxide is 15g / L.

[0038] 2. Preparation of lye: Dissolve soda ash (sodium carbonate) in deionized water to make lye with a concentration of 80-120g / L and a temperature of 50±5°C.

[0039] 3. Add alkali and react: first add sodium carbonate solution according to the mass ratio of sodium carbonate to rare earth oxide in the feed liquid 0.85:1. Stirring reaction: heat the temperature to 52°C, continue to add sodium carbonate solution, adjust the pH value to 6.5, and the rare earth oxide concentration in the supernatant is 0.38g / L.

[0040] 4. Aging reaction: Stop stirring and age the rare earth carbonate for 80 minutes to promote crystal formation.

[0041] 5. Centrif...

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PUM

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Abstract

The invention provides a removal method for calcium and strontium impurity irons in a rare earth feed liquid. The removal method comprises the following steps: kalifying and performing a reaction; performing an ageing reaction; performing centrifuge dripping; and performing high-temperature calcining. The rare earth feed liquid is a lanthanum chloride, cerium chloride or lanthanum cerium chloridefeed liquid containing calcium chloride and strontium chloride, wherein the concentration of lanthanum chloride, cerium chloride or lanthanum cerium chloride are 100 g / L-150 g / L, and the sum of concentrations of calcium oxide and strontium oxide is 0.5 g / L-15 g / L. By controlling the conditions such as reaction temperature, stirring time, pH value and settling time in a reaction process of sodium carbonate and a rare earth chloride solution, rare earth elements in the feed liquid are settled fully, and meanwhile, calcium and strontium ions are left in the solution, so that rare earth and calcium and strontium impurities are separated efficiently; and the removal method is stable in process and economical and environment-friendly.

Description

technical field [0001] The invention relates to a method for removing calcium and strontium impurity ions in a rare earth feed liquid during the process of sodium carbonate precipitation of rare earths, and belongs to the technical field of rare earth hydrometallurgy. Background technique [0002] Shandong Weishan Lake Rare Earth Mine is the second largest light rare earth mine in my country. It belongs to a typical carbonatite vein. The rare earth minerals are mainly bastnaesite, bastnaesite, cerite and so on. Pyroxene, dolomite, calcite, barite, sulfide ore, etc. Due to the complex composition of the original ore, the poor selectivity of rare earth concentrates, and the high content of a large amount of calcium and strontium minerals, the grade of Weishan Lake rare earth concentrate products is 40%, and the impurity minerals are mainly in various forms. Calcium carbonate and strontium carbonate minerals exist in the form of minerals, and also contain some barite and a smal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/44
CPCC22B3/44C22B59/00Y02P10/20
Inventor 李常清郑理杰孙国璐蔺修东
Owner 中稀(寿光)资源科技有限公司
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