Purification method for strontium carbonate

A purification method and technology of strontium carbonate, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of low purity of strontium carbonate, serious agglomeration, unfavorable dispersion, etc., achieve high crystallinity, narrow particle size distribution, convenient production and processing Effect

Inactive Publication Date: 2012-10-17
FOSHAN SONGBAO ELECTRONICS FUNCTIONAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the existing problems such as low purity of strontium carbonate, large particle size, serious agglomeration and unfavorable dispersion

Method used

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  • Purification method for strontium carbonate
  • Purification method for strontium carbonate
  • Purification method for strontium carbonate

Examples

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Embodiment 1

[0025] A kind of purification method of strontium carbonate of embodiment 1, comprises the following steps:

[0026] Step 1. Using industrial strontium carbonate as raw material, removing barium and iron impurities therein, removing slag by pressure filtration to obtain a strontium chloride solution. Its concrete process steps are as follows:

[0027] A. remove barium impurity: industrial strontium carbonate (purity is about 95%) is dissolved with industrial hydrochloric acid, add the sulfuric acid (H 2 SO 4 ), remove the barium impurity, and the acidic solution containing chlorine elements includes industrial hydrochloric acid and hypochlorous acid etc., preferred industrial hydrochloric acid;

[0028] B. remove iron impurity: adding weight ratio is about 6%-10% hydrogen peroxide (H 2 o 2 ), boil for 15-60 minutes, add liquid sodium hydroxide solution (NaOH) to adjust the pH value to 7.0-7.5 to remove iron impurities, the oxidant includes hydrogen peroxide and sodium pero...

Embodiment 2

[0036] A kind of purification method of strontium carbonate of embodiment 2, comprises the following steps:

[0037] Step 1. Using industrial strontium carbonate as raw material, removing barium and iron impurities therein, removing slag by pressure filtration to obtain a strontium chloride solution. Its concrete process steps are as follows:

[0038] A. remove barium impurity: industrial strontium carbonate (purity is about 95%) is dissolved with industrial hydrochloric acid, add the sulfuric acid (H 2 SO 4 ), remove the barium impurity, and the acidic solution containing chlorine elements includes industrial hydrochloric acid and hypochlorous acid etc., preferred industrial hydrochloric acid;

[0039] B. remove iron impurity: adding weight ratio is about 6%-10% hydrogen peroxide (H 2 o 2 ), boil for 15-60 minutes, add liquid sodium hydroxide solution (NaOH) to adjust the pH value to 7.0-7.5 to remove iron impurities, the oxidant includes hydrogen peroxide and sodium pero...

Embodiment 3

[0047] A kind of purification method of strontium carbonate of embodiment 3 comprises the following steps:

[0048] Step 1. Using industrial strontium carbonate as raw material, removing barium and iron impurities therein, removing slag by pressure filtration to obtain a strontium chloride solution. Its concrete process steps are as follows:

[0049] A. remove barium impurity: industrial strontium carbonate (purity is about 95%) is dissolved with industrial hydrochloric acid, add the sulfuric acid (H 2 SO 4 ), remove the barium impurity, and the acidic solution containing chlorine elements includes industrial hydrochloric acid and hypochlorous acid etc., preferred industrial hydrochloric acid;

[0050] B. remove iron impurity: adding weight ratio is about 6%-10% hydrogen peroxide (H 2 o 2 ), boil for 15-60 minutes, add liquid sodium hydroxide solution (NaOH) to adjust the pH value to 7.0-7.5 to remove iron impurities, the oxidant includes hydrogen peroxide and sodium perox...

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Abstract

The invention relates to a purification method for strontium carbonate, belonging to the technical field of chemical industry. According to the method, industrial strontium carbonate is used as a raw material; barium and iron impurities are removed from strontium carbonate successively and high purity strontium hydroxide crystals are obtained after three times of crystallization; then the high purity strontium hydroxide crystals are dissolved at a constant temperature; food grade carbon dioxide is blown into the dissolved crystals at a constant speed for a synthesis reaction so as to obtain strontium carbonate slurry; and the strontium carbonate slurry undergoes filtration, drying at a constant temperature, crushing and screening so as to obtain desired calcium carbonate. Compared with traditional production processes for strontium carbonate by using an ammonium bicarbonate method, the purification method provided in the invention has the following advantages: produced effluent is deionized water, which enables pollution of ammonia nitrogen to environment to be avoided; process flow is simple and controllable, and the whole process is carried out in a closed environment, thereby preventing external pollution powder; and finally prepared strontium carbonate has a small particle size, good dispersibility, high purity and activity, etc., and can meet increasingly strict requirements of electronic ceramic elements.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for purifying strontium carbonate. Background technique [0002] At present, manufacturers of electronic appliances and communication equipment systems have put forward more and more stringent requirements on the reliability of various electronic components. High-purity ultra-fine electronic-grade easily dispersible raw materials have become the key and core of making ultra-fine, ultra-thin, high-performance electronic ceramic components. Strontium carbonate is used as the main material of electronic ceramic components. Due to various reasons, on the one hand, the strontium carbonate provided by the market has a large particle size, serious agglomeration, large central particle size (D50), and poor dispersion. On the other hand, the strontium carbonate provided by the market has a high purity Low, only about 99%, can not meet the increasingly high requirements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 张深强
Owner FOSHAN SONGBAO ELECTRONICS FUNCTIONAL MATERIALS
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