Method for preparing cubic calcium carbonate from lime dust

A calcium carbonate, cubic technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problems of complex process, uneven particle size and poor dispersion, and achieve High carbonization efficiency, easy industrial production, and optimized production process

Inactive Publication Date: 2018-05-11
XINJIANG CORPS MODERN GREEN CHLOR ALKALI CHEM ENG RES CENT LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention solves the disadvantages of complex process, uneven product particle size and poor dispersion when producing calcium carbonate from solid waste. The multi-stage slag removal device removes silicates that affect product quality, and controls the concentration of carbon dioxide and slaked lime. Parameters such as slaked lime temperature and slaked lime temperature regulate the crystal form and particle size of calcium carbonate, specifically:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for producing cubic calcium carbonate from lime foam, comprising the following steps: using lime foam calcined in a lime kiln as a raw material, and after sieving, taking lime foam with a particle diameter of <30mm to obtain quick lime; Every hour, water is added into the drum digester according to the flow ratio of 6 tons per hour to carry out the digestion reaction, and crude slaked lime is obtained. 100-mesh, 120-mesh, 120-mesh five-stage vibrating screen and five-stage hydrocyclone slag remover with slagging apertures of φ12, φ10, φ10, φ8, φ8 to obtain refined milk of lime, which is reduced to 9° Baume after slag removal Bé; add refined milk of lime to the carbonization tower, control the temperature at 55°C, add 8kg of amino acid, and feed carbon dioxide gas with a concentration of 30% for carbonization reaction, monitor the pH value of the slurry, when the pH value reaches 7, Use phenolphthalein titration, when it is colorless, the reaction time is 3 hour...

Embodiment 2

[0024] Example 2 differs from Example 1 in that: after the lime foam is sieved, the particle size is <20 mm to obtain quicklime; the quicklime is added to the drum digester at a flow rate of 1 ton per hour and water at a rate of 4 tons per hour Carry out the digestion reaction to obtain crude slaked lime, and the Baume degree of the emulsion is 10°Bé; the crude slaked lime has passed through three-stage vibrating screens of 60 mesh, 100 mesh, and 100 mesh successively and five-stage vibrating screens with slag discharge apertures of φ12, φ8, and φ8. stage cyclone slag remover to obtain refined lime milk, which is reduced to 9°Bé after slag removal; the refined lime milk is added to the carbonization tower, the temperature is controlled at 80°C, 12kg of sucrose is added, and the concentration is 90 % carbon dioxide gas for carbonization reaction, monitor the pH value of the slurry, when the pH value is almost 7, use phenolphthalein titration, when it is colorless, the reaction t...

Embodiment 3

[0025] The difference between embodiment 3 and embodiments 1 and 2 is that after the lime foam is sieved, the particle size is less than 30mm to obtain quicklime; the quicklime is added to the drum for digestion at a rate of 1 ton per hour and water at a flow rate of 8 tons per hour Carry out digestion reaction in the machine to get crude slaked lime, and the Baume degree of the emulsion is 15°Bé; add the refined milk of lime to the carbonization tower, control the temperature at 60°C, and add 20kg of protein with a concentration of 25%. Carry out the carbonization reaction with carbon dioxide gas, and monitor the pH value of the slurry. When the pH value is almost 7, use phenolphthalein titration. When it is colorless, the reaction time is 4 hours, and the carbonization is stopped to obtain a calcium carbonate emulsion.

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Abstract

The invention discloses a method for preparing cubic calcium carbonate from lime dust. Calcium hydroxide emulsion is prepared from the lime dust and water in a certain ratio through a digestion reaction, multi-stage deslagging and aging are performed, refined calcium hydroxide emulsion is obtained, a crystal form controller is added, carbon dioxide is introduced simultaneously for a carbonizationreaction, calcium carbonate emulsion with certain concentration can be obtained, then dehydration, drying, crushing and packaging are performed on the calcium carbonate emulsion, and a cubic industrial precipitated calcium carbonate product is obtained finally. The problems that the process is complex, particle size of the product is non-uniform and the dispersity is poor when carbide slag and limestone are taken as raw materials for preparing calcium carbonate at present are solved.

Description

technical field [0001] The invention belongs to the technical field of calcium carbonate production methods, in particular to a method for producing cubic calcium carbonate from lime foam. Background technique [0002] The production of nano-calcium carbonate in the known technology is mostly produced with limestone as the main raw material, and the preferred limestone is calcined at high temperature by the carbonization method to obtain calcium oxide and carbon dioxide, and then the calcium oxide and water react to generate a refined calcium hydroxide suspension; then Pass through the gas, age for a period of time, filter, dry and pulverize to obtain the calcium carbonate product. [0003] Using calcium carbide slag as raw material to produce nano-calcium carbonate, Chinese patent 200510020830 proposes to use calcium carbide slag as raw material to prepare superfine calcium carbonate by chemical precipitation method, dissolve the dried calcium carbide slag in the solution, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/183C01P2004/38C01P2006/65
Inventor 池建忠周军李自兵陈鑫魏朝聂常昆杨登萍高凯
Owner XINJIANG CORPS MODERN GREEN CHLOR ALKALI CHEM ENG RES CENT LTD
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