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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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  • 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 certain conditions (such as ultrasonic vibration, heating reflux, repeated washing, etc.), the process economy and operability are not good, and it is difficult to realize the transformation of achievements and technology promotion in large-scale production

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] see figure 1 Schematic diagram of the technological process, the steps are as follows:

[0035] (1) Na with 5% mass concentration 2 CO 3 The limestone impregnated with the solution is calcined in the vertical kiln (the temperature in the calcining zone is 1000 ℃ ~ 1100 ℃) to prepare quicklime with high activity and low impurity content;

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

[0037] (3) 150 kg of water and 250 kg of the above-mentioned calcium oxide particles are fed into the pre-mixing reactor 2 through the metering pump and the metering scale successively from the feeding port 1. The pre-mixing reactor is equipped with a stirrin...

Embodiment 2

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

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

[0044] (3) 150 kg of digestion solution (3% glucose aqueous solution) and 250 kg of highly active calcium oxide are added to the pre-digester through metering pumps and metering scales successively, and pre-mixed and hydrated for digestion under stirring conditions. Continue under positive pressure for about 15 minutes (the internal pressure of the container is ≤0.08MPa, the pressure control details are the same as in Example 1), and a first-grade powder with a moisture content of about 6% is obtained;

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

Embodiment 3

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

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

[0050] (3) 150 kg of digestion solution (an aqueous solution containing 1% propylene glycol and 1% mass concentration of cyclodextrin) and 250 kg of highly active calcium oxide are added to the pre-digester through metering pumps and metering scales successively, under stirring conditions Carry out premixing and hydration digestion, and the reaction lasts for about 15 minutes under slight positive pressure (container internal pressure ≤ 0.1MPa, 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 primary reaction is completed, open the outlet valve at the bottom of the pre-mixing reactor, and the primary powder is sprayed into the inner cavity of the long-stroke double-screw digester under pressure for full digestion. The high-temperature steam generated by the first-stage digestion reaction is in...

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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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