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Preparation method of food-grade calcium hydroxide

A calcium hydroxide, food-grade technology, applied in the field of preparation of food-grade calcium hydroxide, can solve the problems of easy residual coal ash, unreachable, low whiteness, etc., to avoid coal ash residue, protect the air, and high whiteness Effect

Active Publication Date: 2013-12-25
GUILIN HONGXING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The vast majority of domestic calcium hydroxide production enterprises adopt the method of coal kiln calcination, which is easy to leave coal ash, and emit a large amount of waste gas, polluting the air
The disadvantages of calcium hydroxide produced by this method are: ① low whiteness; ② low content; ③ many impurities, which cannot meet the requirements of food grade calcium hydroxide

Method used

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  • Preparation method of food-grade calcium hydroxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation steps of food grade calcium hydroxide:

[0021] Step 1: Screen the bluestone raw materials according to various indicators of calcium carbonate BG1898-2007, and then crush the bluestone raw materials to form bluestone fragments with a particle size of 2-4 cm;

[0022] Step 2, adding the bluestone fragments into the electric burning rotary furnace for calcination to obtain quicklime, the calcination temperature is 800 ° C, the calcination time is 3 h, and the rotating speed of the electric burning rotary furnace is 10-20 r / h;

[0023] Step 3, adding the quicklime into the digester, adding 35% of the water by weight of the quicklime to carry out a digestion reaction, and obtaining a digestion reaction product;

[0024] In step 4, the digestion reaction product is screened to obtain calcium hydroxide.

[0025] In step 5, the calcium hydroxide is pulverized to meet the requirements of GB25572-2010.

[0026] After testing, according to the detection box in GB25...

Embodiment 2

[0028] Preparation steps of food grade calcium hydroxide:

[0029] Step 1: Screen the bluestone raw materials according to various indicators of calcium carbonate BG1898-2007, and then crush the bluestone raw materials to form bluestone fragments with a particle size of 2-4 cm;

[0030] Step 2, adding the bluestone fragments into the electric calcining rotary furnace for calcination to obtain quicklime, the calcination temperature is 900°C, the calcination time is 2.5h, and the rotating speed of the electric calcining rotary furnace is 10-20 rpm;

[0031] Step 3, adding quicklime into the digester, adding 40% of the water by weight of the quicklime to carry out a digestion reaction, and obtaining a digestion reaction product;

[0032] In step 4, the digestion reaction product is screened to obtain calcium hydroxide.

[0033] In step 5, the calcium hydroxide is pulverized to meet the requirements of GB25572-2010.

[0034] After testing, the calcium hydroxide product obtained ...

Embodiment 3

[0036] Preparation steps of food grade calcium hydroxide:

[0037] Step 1: Screen the bluestone raw materials according to various indicators of calcium carbonate BG1898-2007, and then crush the bluestone raw materials to form bluestone fragments with a particle size of 2-4 cm;

[0038] Step 2, adding the bluestone fragments into the electric calcining rotary furnace for calcination to obtain quicklime, the calcination temperature is 1000°C, the calcination time is 2h, and the rotating speed of the electric calcining rotary furnace is 13-16 rpm;

[0039] Step 3, adding the quicklime into the digester, adding 45% of the water by weight of the quicklime to carry out a digestion reaction to obtain a digestion reaction product;

[0040] In step 4, the digestion reaction product is screened to obtain calcium hydroxide.

[0041] In step 5, the calcium hydroxide is pulverized to meet the requirements of GB25572-2010.

[0042] After testing, the calcium hydroxide product obtained in...

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Abstract

The invention relates to a preparation method of food-grade calcium hydroxide. The preparation method comprises the following steps of: screening the raw material bluestone, and then crushing the raw material bluestone to form bluestone fragments having the grain size in the range from 2 to 4 cm; 2, adding the bluestone fragments to an electric rotary furnace for calcining to obtain quick lime, wherein the calcining temperature ranges from 800 DEG C to 1100 DEG C, the calcining time ranges from 1 h to 3 h, and the rotating speed of the electric rotary furnace ranges from 10 to 20 r / h; 3, adding the quick lime to a digester, adding water which accounts for 35-50% of the quick lime in weight for slaking reaction to obtain slaking reaction products; 4, sieving the slaking reaction products to obtain calcium hydroxide. The preparation method of food-grade calcium hydroxide provided by the invention has the beneficial effects that the electric rotary furnace is used for calcining to avoid coal ash residue, and no waste gas is emitted so that the air is protected. In addition, calcium hydroxide produced has the characteristics of (1) high whiteness, (2) high content and (3) few impurities, and is food-grade calcium hydroxide which is capable of meeting the requirements of GB25572-2010.

Description

technical field [0001] The invention relates to the technical field of food additive preparation, in particular to a preparation method of food-grade calcium hydroxide. Background technique [0002] With the rapid and sustainable development of my country's national economy, the demand for food-grade calcium hydroxide in the market continues to increase. The implementation of the project is in line with the industrial policy of the national "Industrial Structure Adjustment Guidance Catalog". Food-grade calcium hydroxide will have a broad selling space in the domestic and foreign markets, with good development prospects and huge market potential. Therefore, the construction of the project is very necessary. . [0003] The raw materials, finished products and equipment for realizing important production processes used in the method of the present invention are not included in the list of prohibitions and restrictions in the "Interim Regulations on Promoting Industrial Structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02A23L1/03A23L29/00
Inventor 徐宝民林尚鹏黄文周君华王宝庆阳玉华杨芳郑淑珍蒙芳李明辉赵康
Owner GUILIN HONGXING CHEM