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Method for producing high-purity lanthanum carbonate

A production method and technology of lanthanum carbonate, applied in rare earth metal carbonates, chemical instruments and methods, rare earth metal compounds, etc., can solve the problem of high impurity content in lanthanum carbonate products, achieve less adsorption of metal ions, small specific surface area, The effect of large crystal size

Inactive Publication Date: 2017-01-11
乐山沃耐稀电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of production method of high-purity lanthanum carbonate, solve the problem that the impurity content of existing lanthanum carbonate product is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1), 1 part of lanthanum carbonate is added to 1.5 parts of pure water to form a mixed solution;

[0024] (2), add concentrated nitric acid to dissolve in the mixed solution that step (1) obtains, and adjust pH to 1.8 with ammoniacal liquor, be heated to boiling, after 30 minutes, then adjust pH to 4.3 to acid solution with cerium carbonate;

[0025] (3), the acid solution obtained in the step (2) is filtered to obtain the filtrate through the aperture of 200 mesh filter cloth;

[0026] (4), the filtrate that step (3) obtains is carried out microporous filter (aperture 4um) to filter and obtain filtrate;

[0027] (5), the filtrate in (4) is concentrated, and the solution concentration of concentration end point is calculated as 740 g / liter by cerium oxide, pH=1.3;

[0028] (6), the solution in the step (5) is put into the crystallization dish to crystallize naturally, and centrifugal dehydration;

[0029] (7), the crystal in step (6) is dissolved and diluted with wate...

Embodiment 2

[0033] (1), 1 part of lanthanum carbonate is added to 2 parts of pure water to form a mixed solution;

[0034] (2), add concentrated nitric acid to dissolve in the mixed solution that step (1) obtains, and adjust pH to 1.5 with ammoniacal liquor, be heated to boiling, after 30 minutes, then adjust pH to 4 to acid solution with cerium carbonate;

[0035] (3), the acid solution obtained in the step (2) is filtered to obtain the filtrate through the aperture of 200 mesh filter cloth;

[0036] (4), the filtrate that step (3) is obtained carries out microporous filter (aperture 1um) to filter and obtain filtrate;

[0037] (5), the filtrate in (4) is concentrated, and the concentration of the final solution is calculated as 720 g / liter by cerium oxide, pH=1;

[0038] (6), the solution in the step (5) is put into the crystallization dish to crystallize naturally, and centrifugal dehydration;

[0039] (7), the crystal in step (6) is dissolved and diluted with water, and the concentr...

Embodiment 3

[0043] (1), 1 part of lanthanum carbonate is added to 1 part of pure water to form a mixed solution;

[0044] (2), add concentrated nitric acid to dissolve in the mixed solution that step (1) obtains, and adjust pH to 2 with ammoniacal liquor, be heated to boiling, after 30 minutes, then adjust pH4.5 to acid solution with cerium carbonate;

[0045] (3), the acid solution obtained in the step (2) is filtered to obtain the filtrate through the aperture of 200 mesh filter cloth;

[0046] (4), the filtrate that step (3) is obtained carries out microporous filter (aperture 5um) to filter and obtain filtrate;

[0047] (5), the filtrate in (4) is concentrated, and the solution concentration of concentration end point is calculated as 750 g / liter by cerium oxide, pH=1.5;

[0048] (6), the solution in the step (5) is put into the crystallization dish to crystallize naturally, and centrifugal dehydration;

[0049] (7), the crystal in step (6) is dissolved and diluted with water, and t...

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Abstract

The invention discloses a method for producing high-purity lanthanum carbonate. The method comprises the following steps that 1, lanthanum carbonate is added into water to form a mixed solution; 2, concentrated nitric acid is added into the mixed solution obtained in the step 1 to be dissolved, the pH value is adjusted to range from 1.5 to 2 with ammonium hydroxide, the pH is adjusted to range from 4 to 4.5 with cerous carbonate after heating, and an acid solution is obtained; 3, the acid solution obtained in the step 2 is filtered, and filtrate is obtained; 4, the filtrate in the step 3 is concentrated; 5, the concentrated solution obtained in the step 4 is placed in a crystallizing disc to be naturally crystallized, and centrifugal dewatering is carried out; 6, water is added into crystals obtained after centrifugation in the step 5, and dissolving and diluting are carried out; 7, the solution obtained after being treated in the step 6 is heated to 50 DEG C, an ammonium bicarbonate solution is added slowly and then fast for sedimentation, and still standing is carried out after sedimentation is completed; 8, the sediment obtained after being treated in the step 7 is washed, and then centrifugal dewatering and packaging are carried out.

Description

technical field [0001] The invention belongs to the field of rare earth production, and in particular relates to a production method of high-purity lanthanum carbonate. Background technique [0002] The main uses of lanthanum carbonate are: production of lanthanum compounds, such as lanthanum oxide, lanthanum nitrate, etc., production of PVC additives such as petroleum catalysts, etc. At the same time, a new type of anti-hyperphosphatemia drug with high phosphorus binding capacity has been discovered in recent years. At present, there are only a few factories that can produce this product, but the products produced by these manufacturers have high impurity content and heavy organic content after dissolution, which cannot fully meet user requirements. Contents of the invention [0003] The purpose of this invention is to provide a kind of production method of high-purity lanthanum carbonate, solve the problem that the impurity content of existing lanthanum carbonate produc...

Claims

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Application Information

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IPC IPC(8): C01F17/00
CPCC01P2006/80C01F17/247
Inventor 杨青
Owner 乐山沃耐稀电子材料有限公司
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