Production method of high-purity strontium carbonate special for light-emitting material

A high-purity strontium carbonate, production method technology, applied in the direction of strontium carbonate, calcium carbonate/strontium/barium, etc., can solve the problems of strontium carbonate morphology, particle size and distribution control, strontium carbonate microscopic morphology, particle size and distribution are in the lab stage etc.

Active Publication Date: 2016-06-29
CHONGQING DAZU HONGDIE STRONTIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In industrial production, there are many studies on the purity of strontium carbonate, but the research on the microscopic morphology, particle size and distribution of strontium carbo

Method used

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  • Production method of high-purity strontium carbonate special for light-emitting material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Method for producing high-purity strontium carbonate special for luminescent materials

[0030] 1. Preparation of strontium hydroxide:

[0031] a, SrSO 4 Celestite with a content of ≥70% and coal with a C content of ≥65% are mixed at a weight ratio of 1:0.35, preheated, and reduced at a high temperature above 1200°C to obtain black ash clinker with a soluble SrS content of 50%;

[0032] b. Leach the black ash clinker with internal circulating process water above 85°C under airtight conditions for 4 hours to obtain an aqueous solution of strontium sulfide with a SrS concentration of 90g / L; quickly filter the aqueous solution of strontium sulfide to remove impurities and decalcify Iron removal

[0033] c. Cool the strontium sulfide aqueous solution to crystallize in the crystallization tank, control the stirring speed 40r / min, and the cooling rate at 24 hours. After the temperature of the strontium sulfide aqueous solution is reduced to 40℃, the crude strontium hydroxide product ...

Embodiment 2

[0043] Method for producing high-purity strontium carbonate special for luminescent materials

[0044] 1. Preparation of strontium hydroxide:

[0045] a, SrSO 4 Celestite with a content of ≥70% and coal with a C content of ≥65% are mixed at a weight ratio of 1:0.35, preheated, and reduced at a high temperature above 1200°C in the high temperature section to prepare black ash clinker with a soluble SrS content of 52%;

[0046] b. Leach the black ash clinker with internal circulating process water above 85°C under airtight conditions for 4 hours to prepare an aqueous solution of strontium sulfide with a SrS concentration of 100g / L; quickly filter the aqueous solution of strontium sulfide to remove impurities and decalcify Iron removal

[0047] c. Cool the strontium sulfide aqueous solution to crystallize in the crystallization tank, control the stirring speed 40r / min, and the cooling rate at 25 hours. After the temperature of the strontium sulfide aqueous solution is lowered to 40℃, the...

Embodiment 3

[0057] Method for producing high-purity strontium carbonate special for luminescent materials

[0058] 1. Preparation of strontium hydroxide:

[0059] a, SrSO 4 Celestite with a content of ≥70% and coal with a C content of ≥65% are mixed at a weight ratio of 1:0.35, preheated, and reduced at a high temperature above 1200°C in the high temperature section to prepare black ash clinker with a soluble SrS content of 52%;

[0060] b. Leach the black ash clinker with internal circulating process water above 85°C under airtight conditions for 4 hours to obtain an aqueous solution of strontium sulfide with a SrS concentration of 110g / L; quickly filter the aqueous solution of strontium sulfide to remove impurities and decalcify Iron removal

[0061] c. Cool the strontium sulfide aqueous solution to crystallize in the crystallization tank, control the stirring speed to 40r / min, and the cooling rate at 25 hours. After the temperature of the strontium sulfide aqueous solution is reduced to 36°C, ...

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Abstract

The invention discloses a production method of high-purity strontium carbonate special for a light-emitting material. The method comprises the following steps that 1, strontium hydroxide and water are mixed and prepared into a strontium hydroxide slurry; 2, concentrated nitric acid is slowly and dropwise added to the strontium hydroxide slurry, and the reaction endpoint is controlled to meet the condition that the pH is equal to 7.5; 3, ZnO2 is added, sufficient stirring and aging are conducted, filtering is conducted, and clear reaction liquid is obtained; 4, proportionable NH4HCO3 solution is slowly added to the clear reaction liquid, stirring and heat preservation precipitation reaction are conducted, and then sufficient aging is conducted; 5, the material sufficiently aged in the step 4 is subjected to primary filtering, beating and washing are conducted with water, solid-liquid separation is conducted, a filter cake is obtained, a strontium carbonate finished product is obtained after the filter cake is dried, and then packing is conducted. According to the production method of high-purity strontium carbonate special for the light-emitting material, the purity of the prepared strontium carbonate product is larger than or equal to 99.5%, has the spherical micro morphology and has a narrow particle size range distribution, and the particle size is about 20 micrometers.

Description

Technical field [0001] The invention belongs to the technical field of strontium carbonate industrial manufacturing, and specifically relates to a production method of high-purity strontium carbonate special for luminescent materials. Background technique [0002] In industrial production, there are many researches on the purity of strontium carbonate, but the research on the microscopic morphology, particle size and distribution of strontium carbonate is still in the laboratory stage. The methods used in industry cannot be used to determine the morphology and particle size of strontium carbonate. The size and distribution are effectively regulated. Luminous grade strontium carbonate mainly refers to high-purity strontium carbonate with a main content of ≥99.5% for the production of rare earth ultra-long afterglow luminescent materials. In the long-term scientific research and development and production practice, it is found that the purity, microscopic morphology, particle size...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/187C01P2004/32C01P2004/61C01P2006/80
Inventor 宋文强苑志强陈仲汪吉亮
Owner CHONGQING DAZU HONGDIE STRONTIUM IND CO LTD
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