Novel technique for preparing fine calcium carbonate

A technology of fine calcium carbonate and amino acid calcium, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of calcium carbonate quality, whiteness, poor crystal shape, decrease in porosity and specific surface area of ​​carbide slag, and inability to remove impurities in carbide slag, etc. problems, to achieve the effect of low synthesis cost, utilization of three wastes, and high added value of products

Active Publication Date: 2008-10-29
BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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AI Technical Summary

Problems solved by technology

However, there are serious defects in this process. The impurities contained in calcium carbide slag (such as oxides of Si, Mg, Fe, Al, etc.) cannot be removed during the whole process, and salts with a melting point much lower than that of CaO are easily formed during calcination. , causing nodules
These impurities have a great negative impact on carbide slag digestion and carbonization reactions
If the calcium carbide slag is calcined at too high a temperature for a long time, although the structure and size of the CaO structural unit remain unchanged, each unit is combined and sintered into a block, which reduces the porosity and specific surface area of ​​the calcium carbide slag after cal

Method used

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  • Novel technique for preparing fine calcium carbonate
  • Novel technique for preparing fine calcium carbonate
  • Novel technique for preparing fine calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: The calcium glycinate extract generated by the reaction of glycine and carbide slag is carried out by intermittent bubbling carbonization to prepare fine calcium carbonate

[0039] 0.42L water is added in the reactor, then add 50g glycine, mix and stir, then add 32g calcium carbide slag (wherein calcium hydroxide content 77%), continue stirring at room temperature, finish after reaction 20min, filter and obtain 438g calcium glycinate liquid, Among them, the calcium ion concentration is 2.7%, and the calcium extraction rate is 93.5%. The extract is transferred to the intermittent bubbling reactor, and carbon dioxide is passed into the extract. When the pH=6.7, the reaction ends, and the filter drying obtains calcium carbonate 30.5g, and its aggregate diameter is distributed below 10 microns, and its purity is 96%. Whiteness 97%. The rest of the indicators are in line with the requirements of HG2226-91 indicators.

Embodiment 2

[0040] Embodiment 2: The calcium glycinate extract that generates by the reaction of glycine and carbide slag carries out kettle type carbonization method to prepare fine calcium carbonate

[0041] Add 0.5L of water into the reactor, add 150g of glycine, mix and stir, then add 80g of calcium carbide slag (calcium hydroxide content 77%) and continue to stir at room temperature, and finish the reaction after 20min to obtain 640g of calcium glycine extract, in which calcium The ion concentration is 4.76%, and the calcium extraction rate is 94%. The extract is transferred to a tank reactor, feeds carbon dioxide gas, and when the pH=7.6, the reaction ends, and the filtration and drying obtains calcium carbonate 50g, and its particle diameter is all below 10 microns, and its purity is 96%, and the whiteness is 96%. The rest of the indicators are in line with the requirements of HG2226-91 indicators.

Embodiment 3

[0042] Example 3: The calcium glycinate extract generated by the reaction of glycine and calcium carbide slag is passed through carbon dioxide in an inner circulation air-lift ultrasonic reactor to obtain fine calcium carbonate

[0043] Add 2.0L of water into the reaction kettle, then add 225g of glycine, heat to 40°C, and stir until dissolved. Then add 200g of calcium carbide slag (wherein calcium hydroxide content is about 77%) and continue to insulate and stir at 40°C, finish after reacting for 20min, and filter while hot to obtain 2240g of calcium glycinate extract, wherein the calcium ion concentration is 3.46%, and the calcium extraction rate is 94%. . The extract is transferred to the inner circulation air-lift ultrasonic reactor, and carbon dioxide is introduced. When the pH=7.2, the reaction ends, and the filtered and dried calcium carbonate 114g is obtained. The particle diameter is all below 10 microns, and most of them are distributed in the 1-3 microns, its purit...

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Abstract

The invention provides a new method which takes carbide slag, quick lime or slaked lime as calcium material to react with amino acids for preparing fine calcium carbonate. The method provides a very good scheme for the problems dealing with industrial waste carbide slag, so the method has very good environment-friendly, social and economic benefits.

Description

technical field [0001] The invention relates to a simple and economical new process for preparing fine calcium carbonate, in particular to a process for preparing fine calcium carbonate by using carbide slag as raw material. The process of the invention utilizes amino acid to extract effective calcium in calcium carbide slag, separates insoluble impurities, and prepares high-purity fine calcium carbonate through an internal circulation air-lift ultrasonic method. Background technique [0002] Calcium carbonate is one of the important inorganic powder fillers. Because of its good dispersibility, smoothness and fluidity, it is widely used in plastics, papermaking, coatings, rubber, chemical building materials, daily chemicals, medicine, food, feed and other industries. . With the rapid development of my country's economic construction, the domestic demand for calcium carbonate is increasing, and its output has been increasing at an average rate of 10% per year in recent years...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 尹应武袁可冯天瀚谢增勇黄仁才杨立雯赵丽丹
Owner BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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