Process for preparing high purity strontium carbonate

A high-purity strontium carbonate and strontium sulfate technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of low production cost of high-purity strontium carbonate, consumption of hydrochloric acid chemical raw materials, and small dissolution of calcium sulfide, etc., to achieve low production cost, The effect of short process route and narrow particle size distribution

Inactive Publication Date: 2005-11-23
CHONGQING UNIV
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Problems solved by technology

This method has the following disadvantages: a large amount of harmful gas hydrogen sulfide is produced in the reaction process, which is very easy to cause environmental pollution, so how to control the pollution of hydrogen sulfide gas is the key to the development of this technology; loss of waste
However, the production cost of directly preparing high-purity strontium carbonate by using celestite reduction metathesis method is low, but so far in my country, the research and production of high-purity strontium carbonate directly prepared by this process are still blank
The patent "production process of strontium carbonate" (CN1042886A) first reacts with hydrochloric acid and strontium sulfide leaching solution, and then reacts with ammonium bicarbonate to prepare strontium carbonate, and th...

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  • Process for preparing high purity strontium carbonate
  • Process for preparing high purity strontium carbonate
  • Process for preparing high purity strontium carbonate

Examples

Experimental program
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Embodiment 1

[0033] Embodiment 1: The content is 93.7% lapis lazuli, anthracite, calcium chloride are batched with the weight ratio of 100:60:0.6, and ground to 80~120 meshes, after mixing evenly, roasting at 1000~1200 ℃ for 1~2 Hour. The roasted powder is leached while it is hot, and the leaching temperature is 75-90°C; the dry weight of the filter residue accounts for about 4.5% of the weight of the roasted powder, indicating that 95.5% of the roasted powder is soluble, and the conversion rate of strontium sulfide is high; The strontium leaching solution was kept at constant temperature and analyzed for Sr 2+ concentration, add NaOH in proportion (5-10% in excess), cooling and crystallizing to precipitate strontium hydroxide octahydrate crystals. Strontium hydroxide octahydrate crystals are directly dissolved in hot water and reacted with carbon dioxide. The reaction temperature is 75-85°C, and strontium carbonate powder can be directly obtained with a purity of 97.48% (see Table 1), me...

Embodiment 2

[0034] Example 2: Dissolve the strontium hydroxide octahydrate crystal obtained in Example 1 in boiling water (100°C) to obtain a saturated solution, cool to 20°C to obtain a recrystallized strontium hydroxide octahydrate crystal, according to the reaction conditions of Example 1 Strontium carbonate was prepared with a purity of 99.24% (see Table 1).

Embodiment 3

[0035] Example 3: The crystals obtained in Example 2 were recrystallized twice or three times according to the recrystallization process in Example 2, and respectively reacted with carbon dioxide at 75-85°C under the action of an ultrasonic system to obtain strontium carbonate The purities were 99.73% and 99.97% respectively (see Table 1). For the physical and chemical properties of strontium carbonate obtained by secondary recrystallization, see figure 2 (particle size and distribution), image 3 (particle microscopic morphology), Figure 4 (product phase analysis), Figure 5 (product thermal characteristics analysis). From the analysis of the chemical composition and physical and chemical characteristics of the product, it can be seen that the strontium carbonate product obtained by secondary or secondary recrystallization and under the action of ultrasonic waves is superior to the standard strontium carbonate for electronic ceramics in Japan and the United States.

[0...

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Abstract

Disclosed is a process for preparing high purity strontium carbonate, which comprises mixing celestite, anthracite coal, calcium chloride as catalyst, high-temperature roasting for deacidizing strontium sulfide, filtering strontium monosulfide through heat leaching, charging sodium-hydroxide and strontium monosulfide to result in alkali analysis reaction, producing strontium hydroxide crystalline body, the purifying strontium hydroxide through recrystallization process, finally reacting pure strontium hydroxide solution with let-in carbon dioxide at the presence of ultrasonic wave action, thus producing high purity strontium carbonate powder, and reacting lime cream with strontium monosulfide to obtain sodium-hydroxide and strontium monosulfide precipitate, wherein sodium-hydroxide can be circulated in the alkali analysis reaction.

Description

technical field [0001] The invention relates to a method for preparing high-purity strontium carbonate, in particular to the preparation of strontium carbonate for electronic ceramics. Background technique [0002] High-purity strontium carbonate is an important inorganic fine chemical product and an essential raw material for the electronics industry. It not only requires high chemical purity, but also requires small particle size, narrow particle size distribution range and approximately round particle shape. . At present, only a few countries in the world, such as Japan and the United States, can produce such high-purity strontium carbonate. Most of its manufacturing methods use industrial-grade strontium carbonate as raw material, and the preparation processes mainly include thermal decomposition and chemical double decomposition. The thermal decomposition method (US3743691, JP59-83934, CN87101234A, CN87104559A, CN1031983A) is to decompose industrial strontium carbonat...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 刘相果彭晓东谢卫东魏群义
Owner CHONGQING UNIV
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