Industrial preparation method of high-reaction-activity nano calcium hydroxide powder

A high-reactivity, calcium hydroxide technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, can solve the problems of difficult achievement transformation and technology promotion, poor process economy and operability, etc., to achieve The effect of low-cost, high-efficiency industrial production

Active Publication Date: 2021-01-05
浙江天石纳米科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned methods are still in the laboratory stage, and generally use soluble calcium salts or calcium alkoxides such as low-concentration and high-value calcium chloride and calcium nitrate as reactants. It is carried out under cer

Method used

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  • Industrial preparation method of high-reaction-activity nano calcium hydroxide powder
  • Industrial preparation method of high-reaction-activity nano calcium hydroxide powder
  • Industrial preparation method of high-reaction-activity nano calcium hydroxide powder

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0033]Example 1

[0034]Seefigure 1 Schematic diagram of the process flow, the steps are as follows:

[0035](1) The 5% mass concentration of Na2CO3The limestone impregnated in the solution is calcined in a shaft kiln (the temperature of the calcining zone is 1000℃~1100℃) to prepare quicklime with high activity and low impurity content;

[0036](2) After the above-mentioned quicklime is sifted through a 120-mesh drum screen to remove impurities such as coal ash powder, the massive quicklime is crushed by a jaw crusher to obtain calcium oxide particles with a particle size of 5-10mm (referred to as highly active calcium oxide, the following examples are all based on This is the raw material);

[0037](3) 150 kg of water and 250 kg of the above calcium oxide particles are added to the pre-mixing reactor 2 from the feeding port 1 through the metering pump and the weighing scale. The pre-mixing reactor is equipped with a stirring motor 21, which can be pre-mixed under agitation and Hydration digest...

Example Embodiment

[0041]Example 2

[0042](1) Same as step (1) of Example 1;

[0043](2) Same as step (2) of Example 1;

[0044](3) 150 kg of digestion solution (3% by mass glucose aqueous solution) and 250 kg of highly active calcium oxide are successively added to the pre-digester via a metering pump and a metering scale. The pre-mixing and hydration digestion are carried out under stirring conditions. The positive pressure lasts for about 15 minutes (the internal pressure of the container is less than or equal to 0.08 MPa, the pressure control details are the same as in Example 1), and the first-grade powder with a moisture content of about 6% is obtained;

[0045](4) After the first stage reaction, open the discharge valve at the bottom of the pre-mixing reactor, and the first stage powder is sprayed into the inner cavity of the long-stroke double spiral digester under pressure for full digestion. The high-temperature steam generated by the first-stage digestion reaction is introduced into the outer jacket o...

Example Embodiment

[0047]Example 3

[0048](1) Same as step (1) of Example 1;

[0049](2) Same as step (2) of Example 1;

[0050](3) 150 kg of digestion solution (aqueous solution containing 1% by mass of propylene glycol and 1% by mass of cyclodextrin) and 250 kg of highly active calcium oxide are added to the pre-digester through a metering pump and a metering scale, and under stirring conditions Carry out pre-mixing and hydration digestion, the reaction lasts for about 15 minutes under slightly positive pressure (the internal pressure of the container is less than or equal to 0.1 MPa, and the pressure control details are the same as in Example 1) to obtain a first-grade powder with a moisture content of about 7%;

[0051](4) After the first stage reaction, open the discharge valve at the bottom of the pre-mixing reactor, and the first stage powder is sprayed into the inner cavity of the long-stroke double spiral digester under pressure for full digestion. The high-temperature steam produced by the first-stage ...

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Abstract

The invention discloses an industrial preparation method of high-reaction-activity nano calcium hydroxide powder, which comprises the following steps of: (1) calcining limestone impregnated by a tempering solution at certain temperature to prepare high-activity low-impurity-content quick lime; (2) removing impurities from the quick lime through a rotary screen, and crushing the quick lime to obtain calcium oxide particles; (3) carrying out primary digestion reaction on the calcium oxide particles and a primary digestion solution under a micro-positive pressure condition to obtain primary powder; (4) introducing the primary powder into an inner cavity of a long-stroke double-helix digester for continued digesting to obtain secondary powder with the water content of 0.5%-2%; and (5) feedingthe secondary powder into an airflow classifier through a closed pipeline, and carrying out winnowing classification to obtain the high-reaction-activity nano calcium hydroxide powder with the specific surface area of not less than 50m<2>/g. The method has the beneficial effects that industrial production of the nano calcium hydroxide powder is realized with low cost and high efficiency by non-linear control on the reaction pressure and the liquid-solid ratio.

Description

technical field [0001] The invention relates to the field of production and preparation of nano-scale inorganic powder materials, in particular to an industrial preparation method of high-reactivity nano calcium hydroxide powder. Background technique [0002] Compared with traditional micron-scale calcium hydroxide, nano-scale calcium hydroxide has a larger specific surface area, richer microscopic pore structure and higher reactivity, whether it is used as a filler for rubber, plastics, coatings, etc. In the field of manufacturing, or as a reactant in desulfurization and dechlorination, soil treatment, emergency disposal of hazardous chemicals and other environmental protection fields, they have shown overwhelming technical advantages. Due to the numerous potential application fields of nano-calcium hydroxide, its market value is still being tapped and realized, and its market demand is still expanding. [0003] In the traditional micron-scale calcium hydroxide preparation...

Claims

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Application Information

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IPC IPC(8): C01F11/02C01F11/06
CPCC01F11/02C01F11/06C01P2006/12C01P2006/14C01P2004/61
Inventor 田伟周新民翁超唐成
Owner 浙江天石纳米科技股份有限公司
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