Method for preparing barium chloride and co-producing calcium sulfate whiskers by virtue of acid hydrolysis of witherite

A technology of calcium sulfate whiskers and witheraric acid, applied in chemical instruments and methods, calcium/strontium/barium chloride, single crystal growth, etc., can solve the problem that the secondary component calcium is not used reasonably, and achieve the realization of Comprehensive utilization, emission reduction and recycling effect

Inactive Publication Date: 2017-05-10
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, witherite mainly uses the barium resource in it, and the secondary component calcium has not been rationally utilized.

Method used

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  • Method for preparing barium chloride and co-producing calcium sulfate whiskers by virtue of acid hydrolysis of witherite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] process such as figure 1 As shown, medium-grade witherite was used, and BaCO 3 Content is 55 wt %, CaCO 3 The content is 18 wt %. After crushing and sieving, take 80-120 mesh mineral powder and water to make a slurry with a solid content of 50 wt %, and then carry out acidolysis reaction with 10 wt % hydrochloric acid, and add lime after the reaction is complete Adjust the pH of the solution to 9 to remove impurities, and then filter to obtain a filter cake and filtrate. The filter cake is mainly acid-insoluble and impurities, and the filtrate is a purification solution containing calcium chloride and barium chloride. At this time, the barium chloride in the purification solution is The concentration of calcium chloride is 220 g / L, and the concentration of calcium chloride is 52 g / L.

[0020] The purification solution is concentrated and crystallized by evaporation, barium chloride crystals are separated out, and barium chloride crystals and high-calcium liquid are ob...

Embodiment 2

[0023] process such as figure 1 As shown, medium-grade witherite was used, and BaCO 3 Content is 55 wt %, CaCO 3 The content is 16 wt %. After crushing and sieving, take 80-120 mesh mineral powder and water to make a slurry with a solid content of 45 wt %, then carry out acid hydrolysis reaction with 25 wt % hydrochloric acid, and add lime after the reaction is complete Adjust the pH of the solution to 9 to remove impurities, and then filter to obtain a filter cake and filtrate. The filter cake is mainly acid-insoluble and impurities, and the filtrate is a purification solution containing calcium chloride and barium chloride. At this time, the barium chloride in the purification solution is The concentration of calcium chloride is 210 / L, and the concentration of calcium chloride is 56g / L;

[0024] The purification solution is concentrated and crystallized by evaporation, barium chloride crystals are separated out, and barium chloride crystals and high-calcium liquid are obta...

Embodiment 3

[0027] process such as figure 1 As shown, medium-grade witherite was used, and BaCO 3 Content is 50 wt %, CaCO 3 The content is 23 wt %. After crushing and sieving, take 80-120 mesh mineral powder and water to make a slurry with a solid content of 50 wt %, and then carry out acidolysis reaction with 20 wt % hydrochloric acid, and add lime after the reaction is complete Adjust the pH of the solution to 10 to remove impurities, and then filter to obtain filter cake and filtrate. The filter cake is mainly acid-insoluble and impurities, and the filtrate is a purification solution containing calcium chloride and barium chloride. At this time, barium chloride in the purification solution The concentration of calcium chloride is 180 / L, and the concentration of calcium chloride is 63g / L.

[0028] The purification solution is concentrated and crystallized by evaporation, and barium chloride crystals are precipitated, and barium chloride crystals and high-calcium liquid are obtained b...

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Abstract

The invention relates to the technical field of fine chemistry, and particularly discloses a method for preparing barium chloride and co-producing calcium sulfate whiskers by virtue of acid hydrolysis of witherite. According to the method, acid hydrolysis is performed on the witherite to prepare the barium chloride by virtue of a hydrochloric acid, meanwhile, a sulfuric acid is added into a high-calcium solution byproduct to prepare the calcium sulfate whiskers with high added value, and the filtered hydrochloric acid can be finally recycled. Therefore, a calcium water byproduct of a witherite resource is reasonably utilized to turn wastes into wealth, and one of raw materials, namely, the hydrochloric acid, can also be recycled, which is significant for protection and reasonable utilization of the resource, protection of the environment and healthy development of the industry.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a method for preparing barium chloride and co-producing calcium sulfate whiskers by using witherite acid hydrolysis. Background technique [0002] Witherite is a rare mineral resource. Its ore-forming conditions are harsh and difficult to form. It belongs to the associated ore source of barite. After the large-scale witherite metallogenic belt was discovered in the 1990s in my country, there was an upsurge in the research and development of witherite. However, with the continuous development, high-grade witherite resources are decreasing day by day, and it is urgent to find a reasonable way to develop and utilize low-grade witherite resources. Witherite mainly contains BaCO 3 , In addition, there is a considerable part of CaCO in the middle and low grade witherite 3 . At present, witherite mainly utilizes the barium resource in it, and the secondary component calcium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/28C30B29/46C30B29/62
CPCC01F11/28C30B29/46C30B29/62
Inventor 杨虎颜杰邹伟叶宇玲陈炯
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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