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Preparation method of calcium hydroxide with high porosity

A technology of calcium hydroxide and high porosity, applied in the field of chemical production, can solve problems such as difficult to meet industrial production, average yield of calcium hydroxide, low purity of calcium hydroxide, etc., achieve low energy loss, improve economic benefits, The effect of improving operational safety performance

Inactive Publication Date: 2019-05-28
南京格暠环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing production methods of calcium hydroxide in my country mainly use lime as raw material, add hydrochloric acid to dissolve, add alkali to precipitate the calcium chloride solution after impurity removal to produce calcium hydroxide, but the worthwhile calcium hydroxide has low purity, coarse particle size, and low activity. Low, difficult to meet the needs of industrial production
The operation process of the existing calcium hydroxide production process is semi-automatically controlled, the labor intensity is high, the energy consumption loss is large, and the yield of calcium hydroxide is average, so there is a large technical risk

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of high porosity calcium hydroxide comprises the following steps:

[0024] (1) High-temperature calcination treatment: first, the surface of the quicklime block is cleaned and washed to remove surface soil and impurities, and then the cleaned quicklime block is transported to a calciner, and calcium oxide stones are obtained after high-temperature calcination; The high-temperature calcination temperature is 900°C, and the calcination time is 18 hours. After calcination, it is naturally cooled to 60°C for later use;

[0025] (2) Fragmentation and screening of calcium oxide stones: the calcium oxide stones obtained in step (1) are added to the crusher for crushing, and the sieve is taken through a 4-mesh sieve;

[0026] (3) Digestion reaction: Add tap water to the sieved calcium oxide obtained in step (2) for digestion reaction, add 85°C hot water for digestion during the digestion reaction, the amount of water added is 3 times the weight of calcium...

Embodiment 2

[0031] The preparation method of high porosity calcium hydroxide comprises the following steps:

[0032] (1) High-temperature calcination treatment: first, the surface of the quicklime block is cleaned and washed to remove surface soil and impurities, and then the cleaned quicklime block is transported to a calciner, and calcium oxide stones are obtained after high-temperature calcination; The high-temperature calcination temperature is 950°C, and the calcination time is 16 hours. After calcination, it is naturally cooled to 60°C for later use;

[0033] (2) Fragmentation and screening of calcium oxide stones: the calcium oxide stones obtained in step (1) are added to the crusher for crushing, and the sieve is taken through a 4-mesh sieve;

[0034] (3) Digestion reaction: Add tap water to the sieved calcium oxide obtained in step (2) for digestion reaction, add 90°C hot water for digestion during the digestion reaction, the amount of water added is 3.4 times the weight of calci...

Embodiment 3

[0039] The preparation method of high porosity calcium hydroxide comprises the following steps:

[0040] (1) High-temperature calcination treatment: first, the surface of the quicklime block is cleaned and washed to remove surface soil and impurities, and then the cleaned quicklime block is transported to a calciner, and calcium oxide stones are obtained after high-temperature calcination; The high-temperature calcination temperature is 1000°C, and the calcination time is 14 hours. After calcination, it is naturally cooled to 55°C for later use;

[0041] (2) Fragmentation and screening of calcium oxide stones: the calcium oxide stones obtained in step (1) are added to the crusher for crushing, and the sieve is taken through a 4-mesh sieve;

[0042] (3) Digestion reaction: Add tap water to the sieved calcium oxide obtained in step (2) for digestion reaction, add 92°C hot water for digestion during the digestion reaction, the amount of water added is 3.3 times the weight of calc...

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Abstract

The invention provides a preparation method of calcium hydroxide with the high porosity. The preparation method comprises the following steps: (1) high-temperature calcinations treatment; (2) breakingand screening of calcium oxide stone; (3) digestive reaction; (4) filtering and dewatering treatment; (5) baking and drying; and (6) screening and filtering treatment. The preparation method has thegreatest characteristics that by increasing the temperature of digestion water to be 85-100 DEG C greatly and increasing the material digestion temperature to be 145-155 DEG C, a material is sufficiently expanded under the high-temperature digestion state; and water in pores in powder is quickly evaporated, expanded and gasified, and by serving as a pore-forming agent, the porosity and the pore diameter of the interior of the powder are increased greatly. On the basis of the original high specific surface area, by increasing the pore diameter of the micropores in the powder, the worldwide problems that in the solid-liquid reaction process, liquid is difficult to infiltrate into the powder, and consequently the reaction speed is low, and reacting is not thorough are reduced.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a preparation method of high-porosity calcium hydroxide. Background technique [0002] Calcium hydroxide is commonly known as slaked lime and slaked lime, which is made by digesting quicklime with water. With the rapid development of industrial modernization and the country's increasing emphasis on environmental protection, calcium hydroxide has been widely used. For example: petrochemical industry, pharmaceutical and food industry, fine chemical industry, environmental protection field, etc. Moreover, the consumption is increasing rapidly year by year, and the high-quality nano anti-coagulation calcium hydroxide is seriously unbalanced. At the same time, with the country's elimination of backward production capacity and the improvement of environmental protection requirements, indigenous production and small-scale production will gradually withdraw from the market, and the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C04B2/04
Inventor 戴世敏
Owner 南京格暠环保科技有限公司
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