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Preparation method of high-purity calcium hydroxide

A calcium hydroxide, high-purity technology, applied in the field of preparation of high-purity calcium hydroxide, can solve the problems of difficult fine particles of high-purity industrial grade, affecting product application, uneven quality, etc., to achieve significant economic benefits and social High efficiency, easy operation and control, reasonable and ingenious design

Pending Publication Date: 2021-10-08
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process is widely used in industry, there are a series of problems: (1) high-temperature calcination of limestone leads to high production energy consumption; (2) it is difficult to completely remove silicon-based impurities in limestone, resulting in low calcium content (<97%) in the product (3) Part of the calcium oxide cannot be completely digested, resulting in residual calcium oxide in the calcium hydroxide, which seriously affects the application of the product; (4) The whole set of process technology is low in difficulty and poor in economic benefits, which belongs to the traditional backward process. Patent CN110746129A adopts quicklime digestion process Calcium Hydroxide
[0004] To sum up, although there are many calcium hydroxide products on the market, the quality is uneven. The existing silicon-based impurities are difficult to completely remove, and some calcium oxide cannot be completely eliminated. Therefore, the products have low content, many impurities, high acid insolubles, and whiteness. The disadvantages such as low temperature and large color difference of the powder, the quality cannot meet the market demand, and on the other hand, high-temperature calcination still has the problems of high energy consumption and poor economic benefits
And due to the nature of calcium hydroxide itself, the lower the particle size, the easier it is for calcium hydroxide to aggregate into large particles, and it is difficult to achieve high-purity industrial-grade preparation of fine particles

Method used

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Examples

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preparation example Construction

[0028] A preparation method of high-purity calcium hydroxide, comprising the following steps:

[0029] In parts by weight, add 100~300 parts of pure water and 100 parts of heavy calcium into the reaction kettle, start stirring and beating, raise the temperature to 40~80°C, add acetic acid dropwise to it until the pH is 4~6, and keep stirring for 1~ After 2 hours, Ca(Ac) was isolated by filtration 2 solution, and then add liquid caustic soda under stirring until the pH is 7~9, filter and separate to obtain refined Ca(Ac) 2 solution;

[0030] Put 100~200 parts of pure water and 1~5 parts of polyethylene glycol in the reaction kettle, start stirring, raise the temperature to 60~80°C, put 250~300 parts of liquid alkali and step The resulting Ca(Ac) 2 Add the solution dropwise to the reaction device at the same time, ultrasonically vibrate, keep warm for 0.5 to 1 hour, filter with suction, and wash the filter cake with water to obtain NaAc solution and calcium hydroxide fil...

Embodiment 1

[0047] A preparation method of high-purity calcium hydroxide, comprising the following steps:

[0048] ①Put 100kg of pure water and 100kg of heavy calcium into the reaction kettle, start stirring and beating, raise the temperature to 40°C, add acetic acid dropwise to it until the pH is 4, keep stirring for 1 hour, filter and separate to obtain a Ca(Ac)2 solution, and then Add liquid caustic soda under stirring until pH is 7, filter and separate to obtain refined Ca(Ac)2 solution;

[0049] ②Put 100kg of pure water and 1kg of polyethylene glycol 200 in the reaction kettle, start stirring, raise the temperature to 60°C, add 250kg of liquid caustic soda and the Ca(Ac) obtained in step ① 2 The solution was added dropwise to the reaction device at the same time, ultrasonically vibrated, kept warm for 0.5 hours, suction filtered, and the filter cake was rinsed with water to obtain NaAc solution and calcium hydroxide filter cake;

[0050] ③Add the calcium hydroxide filter cake obtain...

Embodiment 2

[0052] A preparation method of high-purity calcium hydroxide, comprising the following steps:

[0053] Add 300kg of pure water and 100kg of heavy calcium into the reaction kettle, start stirring and beating, raise the temperature to 80°C, add acetic acid dropwise to it until the pH is 6, keep stirring for 2 hours, filter and separate to obtain Ca(Ac) 2 solution, then add liquid caustic soda to pH 9 under stirring, filter and separate to obtain refined Ca(Ac) 2 solution;

[0054] Put 200kg of pure water and 5kg of polyethylene glycol 300 in the reaction kettle, start stirring, heat up to 80°C, put 300kg of liquid caustic soda and step The resulting Ca(Ac) 2 The solution was added dropwise to the reaction device at the same time, ultrasonically vibrated, kept warm for 1 hour, suction filtered, and the filter cake was washed with water to obtain NaAc solution and calcium hydroxide filter cake;

[0055] will step The obtained calcium hydroxide filter cake was added to ...

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Abstract

The invention discloses a preparation method of high-purity calcium hydroxide. Heavy calcium carbonate, acetic acid and caustic soda liquid are used as raw materials to prepare the high-purity calcium hydroxide, and the problem of low purity of the calcium hydroxide is fundamentally solved through three processes of acidification of the heavy calcium carbonate, refining of the calcium acetate and synthesis of the calcium hydroxide through a chemical precipitation method, so that impurities in reaction liquid are reduced; a double-drop method is adopted in a chemical precipitation method, caustic soda liquid and a Ca (Ac) 2 solution instantaneously react to generate calcium hydroxide, inclusion of impurities is avoided, calcium hydroxide is high in crystallization degree, few in adsorbed impurities and high in purity, and calcium hydroxide generated through dispersion of polyethylene glycol is adopted, so that agglomeration of calcium hydroxide is avoided; and polyethylene glycol is removed through hot filtration in the later stage, and the purity of calcium hydroxide is not affected. The preparation method of the high-purity calcium hydroxide is reasonable and ingenious in design, the adopted materials are all conventional materials, the process is easy to operate and control, industrial production can be achieved, and remarkable economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of calcium hydroxide synthesis, in particular to a preparation method of high-purity calcium hydroxide. Background technique [0002] Calcium hydroxide is widely used in industry, such as industrial grade calcium hydroxide is widely used in sewage treatment, acid water neutralization treatment, flue gas desulfurization, garbage incineration and other fields, food grade calcium hydroxide is widely used in food additives, stearin Calcium acid, calcium naphthenate, calcium lactate, calcium citrate synthesis and other high-grade organic chemical synthesis and other fields. High-quality industrial grade calcium hydroxide is used in new coatings, chemical synthesis, leather manufacturing and other industries. [0003] The main production process of calcium hydroxide in China is quicklime digestion process, which is divided into dry process and wet process. Lime calcium oxide is prepared by calcining limestone at...

Claims

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Application Information

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IPC IPC(8): C01F11/02
CPCC01F11/02C01P2006/80C01P2006/60C01P2004/61
Inventor 岳涛徐婷唐晓婵任倩王瑞菲杨旭
Owner QINGDAO UNIV OF SCI & TECH
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