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Purification method for calcium carbonate

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

Active Publication Date: 2015-05-20
FOSHAN SONGBAO ELECTRONICS FUNCTIONAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Purification method for calcium carbonate
  • Purification method for calcium carbonate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of purification method of calcium carbonate of embodiment 1, comprises the following steps:

[0029] Step 1. Dissolving Shuangfei powder containing calcium carbonate with a weight ratio of 90%-95% with industrial hydrochloric acid to remove barium, magnesium and iron impurities in the raw materials to obtain calcium chloride clear liquid; the acidic solution containing chlorine elements Can be industrial hydrochloric acid or hypochlorous acid, preferably industrial hydrochloric acid.

[0030] Described removal contains barium, magnesium and iron impurity in the raw material of calcium carbonate, and its specific process steps are:

[0031] A. Remove barium impurities in raw materials containing calcium carbonate: dissolve the Shuangfei powder containing calcium carbonate with a weight ratio of 90%-95% with industrial hydrochloric acid, add sulfuric acid with a weight ratio of 3-10% to remove barium impurities ;

[0032] B. Removal of magnesium and iron impuriti...

Embodiment 2

[0042] A kind of purification method of calcium carbonate of embodiment 2, comprises the following steps:

[0043] Step 1. dissolving the limestone powder containing calcium carbonate with a weight ratio of 90%-95% with industrial hydrochloric acid, removing barium, magnesium and iron impurities in the raw materials, and obtaining calcium chloride clear liquid; the acidic solution containing chlorine elements Can be industrial hydrochloric acid or hypochlorous acid, preferably industrial hydrochloric acid.

[0044] Described removal contains barium, magnesium and iron impurity in the raw material of calcium carbonate, and its specific process steps are:

[0045] A. Remove barium impurities in raw materials containing calcium carbonate: dissolve the Shuangfei powder containing calcium carbonate with a weight ratio of 90%-95% with industrial hydrochloric acid, add sulfuric acid with a weight ratio of 3-10% to remove barium impurities ;

[0046] B. Removal of magnesium and iron...

Embodiment 3

[0056] A kind of purification method of calcium carbonate of embodiment 3, comprises the following steps:

[0057] Step 1. dissolving the marble powder containing calcium carbonate in a weight ratio of 90%-95% with industrial hydrochloric acid, removing barium, magnesium and iron impurities in the raw materials to obtain calcium chloride clear liquid; the acidic solution containing chlorine elements Can be industrial hydrochloric acid or hypochlorous acid, preferably industrial hydrochloric acid.

[0058] Described removal of barium, magnesium and iron impurities in the raw material, its specific process steps are:

[0059] A. remove the barium impurities in the raw material: dissolve the Shuangfei powder containing calcium carbonate with a weight ratio of 90%-95% with industrial hydrochloric acid, add sulfuric acid with a weight ratio of 3-10% to remove the barium impurities;

[0060] B. Remove magnesium and iron impurities in raw materials: add hydrogen peroxide with a weig...

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Abstract

The invention relates to a purification method for calcium carbonate, belonging to the technical field of chemical industry. According to the method, lime stone powder, calcium-magnesium powder and marble powder are used as raw materials; barium, magnesium and iron impurities are removed from the raw materials successively and a high purity calcium chloride solution is prepared; then a sodium hydroxide solution with a fixed concentration is added so as to prepare a calcium hydroxide solid-liquid mixture; carbon dioxide is allowed to enter into the mixture under the condition of a constant temperature for a synthesis reaction so as to prepare calcium carbonate slurry; and the carbonate calcium slurry undergoes filtration, draining at a constant temperature, crushing and screening so as to obtain desired calcium carbonate. Compared with traditional production processes for calcium carbonate by using an ammonium bicarbonate method, the purification method provided in the invention has the following advantages: produced effluents are deionized water and sodium chloride, 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 calcium carbonate has a small particle size, good dispersibility, high purity and activity, etc., and is extensively used as a ceramic material for a multilayer monolithic capacitor base metal electrode high frequency element and a positive temperature coefficient thermistor element.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for purifying calcium 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. Calcium carbonate is used as the main material of electronic ceramic components. Due to various reasons, on the one hand, the calcium 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 calcium carbonate provided by the market has a high purity. Low, only about 99%, can not meet the strict requirements of the electronic...

Claims

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Application Information

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