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Preparation method of strontium carbonate with high purity

A technology of high-purity strontium carbonate and high-purity water, which is applied in the direction of calcium carbonate/strontium/barium, calcium/strontium/barium sulfate, etc., can solve the difficulty of handling ammonium chloride solution, the difficulty of chloride washing, and the difficulty of synthesizing particle size and other problems, to achieve the effect of easy product quality, high utilization rate and reduced consumption

Active Publication Date: 2012-11-07
NANJING JINYAN STRONTIUM IND
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] Disadvantages: high production cost, especially difficult for chloride washing, and difficult to deal with solutions containing low concentration of ammonium chloride
The biggest disadvantage is that the production cost is high, and it is difficult to synthesize products with relatively large particle sizes

Method used

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  • Preparation method of strontium carbonate with high purity
  • Preparation method of strontium carbonate with high purity
  • Preparation method of strontium carbonate with high purity

Examples

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Embodiment

[0033] Embodiment: the preparation method of high-purity strontium carbonate of the present invention, as image 3 As shown, it includes the following steps: (1) first remove impurities from the brine (the main component is strontium sulfide solution) in the strontium sulfide leaching process, and then cool and crystallize (the main component of the crystal is strontium hydroxide octahydrate); (2) put The crystals are separated and washed, and the washing liquid is returned to the leaching process; (3) The first recrystallization: the crystals are dissolved in high-purity water at 90 ° C, and every 20 grams of strontium hydroxide octahydrate crystals are dissolved in 100 ml of high-purity water, and hydrogen peroxide is added at the same time Oxidize sulfur ions in various valence states in the solution, the molar ratio of hydrogen peroxide to sulfur ions in the solution is 1:1; stir for 30 minutes, filter, the filter residue is mainly strontium sulfate precipitate, after treat...

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Abstract

The invention discloses a preparation method of strontium carbonate with high purity. The method is characterized by comprising the following steps: (1) cooling and crystallizing a strontium sulfide solution, and separating out crude strontium hydroxide crystals; (2) recrystallizing the crude strontium hydroxide crystals after 2-5 times to obtain pure strontium hydroxide crystals; and (3) reacting the crystals prepared in the step (2) with liquid carbon dioxide to produce strontium carbonate, and dewatering and drying to obtain the strontium carbonate with high purity. According to the invention, brine from a leaching procedure in an original strontium carbonate production process is used as a raw material to realize low preparation cost; no sodium ion or chloride ion is added during the preparation process of the strontium carbonate with high purity; the product has easily controlled quality, and is simple for washing; no acid solution is added, and no waste gas is generated in the entire production process; wastewater generated in production process all returns to an industrial production line of strontium carbonate; therefore, the production process is green and clean.

Description

technical field [0001] The invention relates to a preparation method of high-purity strontium carbonate. Background technique [0002] With the rapid development of the electronics industry and information industry, high-purity strontium carbonate, as an important new chemical raw material, is now widely used in green materials—strontium-based luminescent materials, liquid crystal glass substrates, ceramic capacitors, semiconductor capacitors, strontium titanate-based voltage Sensitive resistors, PTC ceramic resistors, high-performance magnetic materials, high-purity strontium manufacturing and other fields. With the continuous emergence of new materials and the continuous improvement of performance, the raw material requirements for high-purity strontium carbonate are also increasing. Purity is gradually developing from 97% in the past to 99.99%. Not only are the requirements for impurity content more and more stringent, but also physical properties such as particle shape ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C01F11/46
Inventor 邱为农
Owner NANJING JINYAN STRONTIUM IND
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