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Preparation method for high-purity strontium carbonate

A technology of high-purity strontium carbonate and ammonium bicarbonate, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficult removal, affecting product purity, etc., and achieve the effects of preventing crystal form defects, preventing magazine residues, and improving uniformity.

Inactive Publication Date: 2014-05-14
MIANYANG YUANDA NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adopting this method makes the reaction matrix contain a large amount of chloride radicals and volatile ammonia salts, which are easily wrapped and occluded by strontium carbonate crystals during crystallization and crystal growth, and are difficult to remove during washing and roasting, which affects product purity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: At room temperature, stir and dissolve 100 g of ammonium bicarbonate in 1000 g of double-distilled water to prepare ammonium bicarbonate solution. At the same time, at 80° C., stir and dissolve 300 g of strontium hydroxide with 1500 g of double-distilled water in the reaction In the kettle, prepare a strontium hydroxide solution, then add 6g of surfactant fatty acid sorbitan to the prepared strontium hydroxide solution, and stir at a constant temperature for 90min at a temperature of 80°C; then prepare the ammonium bicarbonate solution from the reaction kettle Feed tubes at different positions were added to the reactor, and at the same time, the mixture was stirred and reacted at 60° C. at 100 rpm for 5 hours. The completed reaction material was added to a centrifuge and centrifuged for 60 minutes, and the separated solid was rinsed with high-purity water 8 times, each time for 20 minutes; the rinsed solid was added to a roasting furnace for roasting, and the ...

Embodiment 2

[0014] Example 2: At room temperature, stir and dissolve 50 g of ammonium bicarbonate in 500 g of double-distilled water to prepare an ammonium bicarbonate solution. At the same time, at 50° C., stir and dissolve 150 g of strontium hydroxide with 725 g of double-distilled water in the reaction In the still, prepare a strontium hydroxide solution, then add 3g of surfactant vegetable oleic acid to the prepared strontium hydroxide solution, and stir at a constant temperature of 50°C for 60min; then prepare the ammonium bicarbonate solution from the reaction kettle The feeding tube at the position was added to the reaction kettle, and at the same time, the reaction was stirred at 300 rpm at 40°C for 3 hours. The completed reaction material was added to a centrifuge for 40 minutes of centrifugal separation, and the separated solid was rinsed with high-purity water 10 times, each time for 10 minutes; the rinsed solid was added to a roasting furnace for roasting, and the roasting was ...

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Abstract

The invention discloses a preparation method for high-purity strontium carbonate. The preparation method comprises the steps of adding a bicarbonate solution into a solution in which strontium hydroxide and a surfactant are dissolved through a multi-region material feeding type reaction kettle, performing stirring reaction for certain time, centrifugating products obtained in the reaction, leaching solids with a detergent, and roasting the solids by adopting an on-line temperature gradient control dynamic roasting technology to obtain the high-purity strontium carbonate. According to the preparation method disclosed by the invention, the strontium hydroxide and bicarbonate which do not contain chlorides are used as raw materials, so that the existence of the chlorides in the reaction products is avoided; meanwhile, due to the action of the surfactant which is added before precipitates are produced, a multi-point material feeding reaction mode and the on-line temperature gradient control technology of a roasting furnace, the problem of aggregation of the precipitates can be solved, and the digestion time of the precipitates is fully shortened; crystal residues and impurity residues are prevented in the precipitate crystallization process; the conversion of the products from rod-type structures into spherical crystal structures is realized; the uniformity of the particle sizes of the products is improved.

Description

technical field [0001] The invention relates to the technical field of design materials, in particular to a method for preparing high-purity strontium carbonate. Background technique [0002] Strontium carbonate is an important functional material necessary for the manufacture of flat panel display glass substrates. The production of flat panel display glass substrates has extremely high requirements on the quality of high-purity strontium carbonate. At present, the production methods of strontium carbonate mainly include: carbon reduction method, strontium mineral thermal decomposition method and double decomposition. Among them, the double decomposition method uses industrial strontium chloride and edible ammonium bicarbonate as raw materials to produce strontium carbonate. It has the characteristics of short process, high product purity, easy control of crystal form, and high quality stability and consistency. It is the main process for producing high-purity products at h...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 范勇军汤明松张仁达
Owner MIANYANG YUANDA NEW MATERIALS
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