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Preparation method of high purity calcium hydroxide

A calcium hydroxide and high-purity technology, applied in the field of preparation of high-purity calcium hydroxide, can solve the problems of low efficiency and complicated operation of calcium hydroxide process, so as to reduce pollution, improve resource utilization efficiency, and improve extraction and impurity removal. The effect of efficiency

Active Publication Date: 2019-10-18
都安春旭新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to obtain high-purity calcium hydroxide, the present invention provides a preparation method of high-purity calcium hydroxide, and at the same time solves the problems of complex operation and low efficiency of the calcium hydroxide extraction process from calcium carbide slag

Method used

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  • Preparation method of high purity calcium hydroxide

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Effect test

Embodiment 1

[0019] A kind of preparation method of high-purity calcium hydroxide, it specifically comprises the steps:

[0020] (1) Dry carbide slag under ultrasonic conditions for 1 hour, and then pass through a 250-mesh sieve to obtain carbide slag pretreatment; the ultrasonic drying is carried out at an ultrasonic frequency of 40kHz and a temperature of 50°C;

[0021] (2) Stir and mix the calcium carbide slag pretreated product obtained in step (1) and deionized water at a ratio of 1:12 by weight for 45 minutes to obtain a mixed solution, and then mix the mixed solution at a stirring speed of 400r / min. The liquid and the organic extractant are mixed according to the weight ratio of 10:2, extracted at 60°C for 2 hours, then left to stand for 20 minutes, and the organic phase is separated and removed by suction filtration to obtain a solid; the organic solvent is ethanediol It is obtained by mixing alcohol and tributyl phosphate according to the ratio of 4:1 by weight;

[0022] (3) Mix ...

Embodiment 2

[0024] A kind of preparation method of high-purity calcium hydroxide, it specifically comprises the steps:

[0025] (1) Dry carbide slag under ultrasonic conditions for 1.5 hours, and then pass through a 200-mesh sieve to obtain carbide slag pretreatment; the ultrasonic drying is carried out at an ultrasonic frequency of 30kHz and a temperature of 40°C;

[0026] (2) Stir and mix the calcium carbide slag pretreated product obtained in step (1) and deionized water at a ratio of 1:10 by weight for 30 minutes to obtain a mixed solution, and then mix the mixture at a stirring speed of 300r / min Liquid and organic extractant were mixed according to the weight ratio of 10:1, extracted at 80°C for 1 hour, then left to stand for 30 minutes, separated and removed the organic phase, and suction filtered to obtain a solid; the organic solvent was ethylene glycol It is obtained by mixing alcohol and tributyl phosphate according to the ratio of 3:1 by weight;

[0027] (3) Mix the solid obta...

Embodiment 3

[0029] A kind of preparation method of high-purity calcium hydroxide, it specifically comprises the steps:

[0030] (1) Dry carbide slag under ultrasonic conditions for 2 hours, and then pass through a 300-mesh sieve to obtain carbide slag pretreatment; the ultrasonic drying is carried out at an ultrasonic frequency of 60kHz and a temperature of 60°C;

[0031] (2) Stir and mix the calcium carbide slag pretreated product obtained in step (1) and deionized water at a ratio of 1:15 by weight for 60 minutes to obtain a mixed solution, and then mix the mixture at a stirring speed of 500r / min The liquid and the organic extractant are mixed according to the weight ratio of 10:1.5, extracted at 50°C for 1.5 hours, then left to stand for 15 minutes, and the organic phase is separated and removed, followed by suction filtration to obtain a solid; the organic solvent is ethylene glycol It is obtained by mixing alcohol and tributyl phosphate according to the ratio of 2:1 by weight;

[00...

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Abstract

The invention discloses a preparation method of high purity calcium hydroxide. The method includes: firstly drying carbide slag under an ultrasonic condition, then performing sieving with a 200-300mesh sieve to obtain pretreated carbide slag, then mixing the pretreated carbide slag with deionized water, then adding an organic extractant and performing extraction at 50-80DEG C for 1-2h, then performing standing for 15-30min, separating and removing the organic phase, then conducting pumping filtration to obtain a solid, and then washing the obtained solid with propanol, performing filtering, and drying the filter residue under a vacuum condition for 1-2h, thus obtaining high purity calcium hydroxide. The method provided by the invention can acquire high purity calcium hydroxide product, atthe same time solves the problems of complex technological operation and low efficiency in extraction of calcium hydroxide with carbide slag, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of calcium hydroxide production, and in particular relates to a preparation method of high-purity calcium hydroxide. Background technique [0002] Carbide slag is the waste residue obtained after hydrolysis of calcium carbide to obtain acetylene gas, and its main component is calcium hydroxide. Since acetylene is one of the important raw materials in the basic organic synthesis industry, currently my country commonly uses calcium carbide and water (wet method) to produce acetylene. According to production experience, 1 ton of calcium carbide and water can generate more than 300 kg of acetylene gas, and at the same time, 10 tons of calcium carbide can produce acetylene gas with a solid content of about 12 % of industrial waste liquid, namely calcium carbide slurry. After further dehydration, the calcium carbide slag slurry still has a water content of 40% to 50% and is in the form of a paste. It is easy to le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/16
CPCC01F11/16C01P2006/80
Inventor 韦明
Owner 都安春旭新材料科技有限责任公司
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