Preparation method for 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 low product quality, agglomeration, low specific surface area, etc., to prolong residence time, improve conversion rate and specific surface area, The effect of high specific surface area

Inactive Publication Date: 2018-07-17
董小琳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of agglomeration, low specific surface area and low product quality in the prior art calcium hy

Method used

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  • Preparation method for food-grade calcium hydroxide
  • Preparation method for food-grade calcium hydroxide
  • Preparation method for food-grade calcium hydroxide

Examples

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preparation example Construction

[0031] The present embodiment provides a kind of preparation method of food grade calcium hydroxide, comprises the following steps:

[0032] Step 1: Pour quicklime particles into a drum-type ball mill to obtain powdery particles with a particle size of 200-500 μm after ball milling. The outlet of the ball mill is connected to a bucket elevator, and after ball milling, the powdery particles are transported to the quicklime silo; like figure 1 Shown is a scanning electron microscope image of calcium oxide after ball milling, and it can be seen from the figure that the particle size of calcium oxide powder particles is in the range of 200-500 μm.

[0033] Step 2: The powdery particles in the quicklime silo are transported to the primary digester through spiral electronic metering. In order to prevent dust pollution on site, all material reactions are carried out in the pipeline, and the primary digester is equipped with a spraying device. The exterior is equipped with a cold wat...

Embodiment 1

[0050] The preparation method of the food-grade calcium hydroxide provided by the present embodiment comprises the following steps:

[0051] Step 1: Pour the quicklime particles into a drum-type ball mill, where the ball-to-material ratio is 40:1, and mill for 10 hours; after ball milling, powdery particles with a particle size of 200-500 μm are obtained, and the outlet of the ball mill is connected to a bucket elevator, and the ball mill Finally, the powdery particles are transported to the quicklime silo;

[0052] Step 2: The powdery particles in the quicklime silo are transported to the three-axis rotary quicklime digester through spiral electronic metering. In order to prevent dust pollution on site, all material reactions are carried out in the pipeline, and the three-axis rotary quicklime digester The interior is equipped with a spraying device, and the exterior is equipped with a cold water jacket; the spraying device sprays a mixed solvent of water and alcohol solvent,...

Embodiment 2

[0056] The preparation method of the food-grade calcium hydroxide provided by the present embodiment comprises the following steps:

[0057] Step 1: Pour quicklime particles into a drum-type ball mill, where the ball-to-material ratio is 20:1, and mill for 4 hours; after ball milling, powdery particles with a particle size of 200-500 μm are obtained. The outlet of the ball mill is connected to a bucket elevator, and the ball mill is Finally, the powdery particles are transported to the quicklime silo;

[0058] Step 2: The powdery particles in the quicklime silo are transported to the three-axis rotary quicklime digester through spiral electronic metering. In order to prevent dust pollution on site, all material reactions are carried out in the pipeline, and the three-axis rotary quicklime digester The interior is equipped with a spraying device and the exterior is equipped with a cold water jacket; the spraying device sprays a mixed solvent of water and alcohol solvent, the ra...

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Abstract

The invention discloses a preparation method for food-grade calcium hydroxide, and belongs to the field of food additives. The method comprises the following steps: pouring quicklime particles into adrum-type ball mill to obtain powdery particles with a particle size of 200-500 [mu]m, conveying the powdery particles into a quicklime bin, and conveying the obtained powdery particles into a primarydigestive device, wherein the interior of the primary digestive device is equipped with a spraying device for spraying a mixed solvent of water and an alcohol solvent, and the exterior is equipped with a cold water sleeve; controlling a primary digestion stirring frequency range at 25-40 Hz; stirring a material conveyed by the primary digestive device by a secondary digestive device until calciumoxide is fully converted into calcium hydroxide; and performing purification on the calcium hydroxide digested by the secondary digestive device to remove residues, performing drying under the temperature condition of 150-300 DEG C, and performing sieving to obtain a finished product of the required food-grade calcium hydroxide. The method provided by the invention has the beneficial effects thatmulti-stage digestion is adopted for sintering the quicklime, and compared one-stage digestion treatment, the method provided by the invention can effectively control quality and costs of the finished product of the calcium hydroxide, and improve a conversion rate and specific surface area of the calcium hydroxide.

Description

technical field [0001] The invention relates to the field of food additives, in particular to a preparation method of food-grade calcium hydroxide. Background technique [0002] Calcium hydroxide has the generality of alkali and is a strong base. The alkalinity of calcium hydroxide is stronger than that of sodium hydroxide (metal activity: calcium>sodium), but because the solubility of calcium hydroxide is much smaller than that of sodium hydroxide , so the corrosiveness and alkalinity of calcium hydroxide solution are smaller than that of sodium hydroxide. These properties determine that calcium hydroxide has a wide range of applications. It is used in agriculture to reduce soil acidity and improve soil structure. Obviously, hydrogen is used in this case. Sodium oxide is out of the question. [0003] At present, the method for producing calcium hydroxide is mainly formed by adding calcium oxide, that is, quicklime, digested with water, drying, sieving, winnowing (or cru...

Claims

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Application Information

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IPC IPC(8): C04B2/04C04B2/06
CPCC04B2/04C04B2/06
Inventor 董小琳其他发明人请求不公开姓名
Owner 董小琳
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