Synthesis method of calcium hydroxide with high specific surface area

A high specific surface area, calcium hydroxide technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of sample agglomeration, low product purity, limited application, etc., and achieve the effect of preventing particle agglomeration

Inactive Publication Date: 2021-10-22
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN1056474A uses a dry process to produce high-activity, high-purity calcium hydroxide. Patent CN109336420A uses quicklime to digest slaked lime through three stages. A certain quality of lower alcohol is used in the digestion water, but this method is complex and time-consuming.
[0004] Ca(OH) 2 As a hydrophilic powder with hydroxyl groups on the surface, the lack of hydrophobic groups on the surface limits the use of calcium hydroxide

Method used

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  • Synthesis method of calcium hydroxide with high specific surface area
  • Synthesis method of calcium hydroxide with high specific surface area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of synthetic method of high specific surface area calcium hydroxide, comprises the following steps:

[0038] Add 100kg of pure water and 100kg of heavy calcium into the reaction kettle, start stirring, raise the temperature to 40°C, add hydrochloric acid dropwise to it until the pH reaches 2, and keep stirring for 2 hours to obtain the reaction solution, filter and separate, and discard the filter cake to obtain CaCl 2 solution;

[0039] 10kg of cetyltrimethylammonium bromide and 60kg of liquid caustic soda are placed in the reaction device, the stirring is started, and the temperature is raised to 60°C, and the step The resulting CaCl 2 The solution was dripped into the reaction device, after the dripping was completed, the temperature was kept for 0.5 hours, suction filtered and rinsed to obtain a filter cake;

[0040] The mass concentration of liquid caustic soda is 28%;

[0041] Take 4kg of mono-6-amino-6-deoxy-β-cyclodextrin and 1kg of aminated gra...

Embodiment 2

[0044] A kind of synthetic method of high specific surface area calcium hydroxide, comprises the following steps:

[0045] Add 300kg of pure water and 100kg of heavy calcium into the reaction kettle, start stirring, raise the temperature to 80°C, add hydrochloric acid dropwise to it until the pH reaches 4, keep stirring for 1 hour to obtain the reaction solution, filter and separate, discard the filter cake, and obtain CaCl 2 solution;

[0046] 30kg of cetyltrimethylammonium bromide and 80kg of liquid caustic soda are placed in the reaction device, the stirring is started, the temperature is raised to 80°C, and the step The resulting CaCl 2 The solution is dripped into the reaction device, after the dripping is completed, the temperature is kept for 1 hour, and the filter cake is obtained by suction filtration and rinsing;

[0047] The mass concentration of liquid caustic soda is 32%;

[0048] Take 6kg of mono-6-amino-6-deoxy-β-cyclodextrin and 3kg of aminated graphe...

Embodiment 3

[0051] A kind of synthetic method of high specific surface area calcium hydroxide, comprises the following steps:

[0052] Add 220kg of pure water and 100kg of heavy calcium into the reaction kettle, start stirring, raise the temperature to 50°C, add hydrochloric acid dropwise to it until the pH reaches 2.5, keep stirring for 1.5 hours to obtain the reaction solution, filter and separate, and discard the filter cake to obtain CaCl 2 solution;

[0053] 15kg of cetyltrimethylammonium bromide and 65kg of liquid caustic soda are placed in the reaction device, the stirring is started, the temperature is raised to 65°C, and the step The resulting CaCl 2 The solution is dripped into the reaction device, after the dripping is completed, it is kept warm for 40 minutes, filtered with suction and rinsed to obtain a filter cake;

[0054] The mass concentration of liquid caustic soda is 31%;

[0055] Take 4.5kg of mono-6-amino-6-deoxy-β-cyclodextrin and 2.5kg of aminated graphene...

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Abstract

The invention discloses a synthesis method of calcium hydroxide with a high specific surface area, and belongs to the technical field of calcium hydroxide synthesis. A calcium chloride solution is dropwise added into a mixed solution of cetyl trimethyl ammonium bromide and liquid caustic soda to generate calcium hydroxide molecules, a crystallization phenomenon is generated after the concentration of calcium hydroxide in a system exceeds the saturation degree, in the synthesis process, cetyl trimethyl ammonium bromide is added to carry out in-situ modification on the product to prevent particle aggregation, Brownian motion is slowed down to effectively control the aggregate, in the post-treatment process of calcium hydroxide, self-made graphene modified carboxymethyl-beta-cyclodextrin is added, graphene modified carboxymethyl-beta-cyclodextrin is cross-linked to form a net structure, calcium hydroxide molecules are dispersed in the net structure, agglomeration among the molecules can be effectively prevented, in the applied deacidification gas reaction, the dispersity of binding sites of calcium hydroxide and acid gas is good, and the reaction is more efficient.

Description

technical field [0001] The invention relates to the technical field of calcium hydroxide production, in particular to a method for synthesizing calcium hydroxide with a high specific surface area. Background technique [0002] Calcium hydroxide is widely used in industry. With the development of technology, various special calcium hydroxides are produced and have achieved good results. For example, medicinal calcium hydroxide mainly focuses on its high purity, and the lead in it is The content of harmful metals such as , arsenic and mercury must meet the pharmacopoeia index, while calcium hydroxide for deacidification gas focuses on its high surface area and dispersibility, in order to meet the requirements of high-efficiency deacidification. [0003] At present, there are two main production methods of high specific area calcium hydroxide: one is to obtain calcium hydroxide with a specific surface area of ​​30m through drying and grinding of milk of lime. 2 / g, referred to...

Claims

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Application Information

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IPC IPC(8): C01F11/02
CPCC01F11/02C01P2004/61C01P2006/12
Inventor 王瑞菲唐晓婵任倩徐婷王灏岳涛
Owner QINGDAO UNIV OF SCI & TECH
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