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Production technology of calcium carbonate powder

A production process and technology of calcium carbonate powder, applied in the direction of calcium carbonate/strontium/barium, calcium/strontium/barium compounds, inorganic chemistry, etc., can solve the problems of insufficient mixing of carbon dioxide and calcium hydroxide, high pH value of products, etc. Achieve the effect of lowering pH value, lowering residues and reducing pollution

Inactive Publication Date: 2019-03-15
连平县鑫福建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a production process of calcium carbonate powder to solve the problem of insufficient mixing of carbon dioxide and calcium hydroxide in the prior art, and the product contains a certain amount of calcium hydroxide, resulting in a high pH value of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of production technology of calcium carbonate powder, comprises steps as follows:

[0020] (1) crushing marble to obtain marble powder with a particle size of 0.5 μm;

[0021] (2) Calcining marble powder, the calcination procedure is: heating at 900°C for 80 minutes; heating at 850°C for 100 minutes; heating at 1000°C for 120 minutes, heating at 1100°C for 120 minutes;

[0022] (3) the calcined marble powder is placed in the first reaction tank and digested with the water in the tank, the water-cement mass ratio is 1:6, the impurities are removed by filtration, and the filtrate is placed in the second reaction tank;

[0023] (4) Carbon dioxide is pulsed into the second reaction tank for carbonization, and each pulse is fed into carbon dioxide at a rate of 400mL / min for 3s until the pH of the slurry is 7, and the ventilation is stopped;

[0024] (5) Centrifugal filtration, dehydration drying, crushing and packaging.

Embodiment 2

[0026] A kind of production technology of calcium carbonate powder, comprises steps as follows:

[0027] (1) crushing marble to obtain marble powder with a particle size of 1 μm;

[0028] (2) Calcining marble powder, the calcination procedure is: heating at 900°C for 100 minutes; heating at 850°C for 90 minutes; heating at 1000°C for 100 minutes, heating at 1100°C for 120 minutes;

[0029] (3) the calcined marble powder is placed in the first reaction tank and digested with the water in the tank, the water-cement mass ratio is 1:8, the impurities are removed by filtration, and the filtrate is placed in the second reaction tank;

[0030] (4) Carbon dioxide is pulsed into the second reaction tank for carbonization, and each pulse is fed into carbon dioxide at a rate of 300mL / min for 3s until the pH of the slurry is 7, and the ventilation is stopped;

[0031] (5) Centrifugal filtration, dehydration drying, crushing and packaging.

Embodiment 3

[0033] A kind of production technology of calcium carbonate powder, comprises steps as follows:

[0034] (1) crushing marble to obtain marble powder with a particle size of 0.5 μm;

[0035] (2) Calcining marble powder, the calcination procedure is: heating at 900°C for 100 minutes; heating at 850°C for 60 minutes; heating at 1000°C for 200 minutes, heating at 1100°C for 120 minutes;

[0036] (3) the calcined marble powder is placed in the first reaction tank to be digested with the water in the tank, the water-cement mass ratio is 1:7, the impurity is removed by filtration, and the filtrate is placed in the second reaction tank;

[0037] (4) Carbon dioxide is pulsed into the second reaction tank for carbonization, and each pulse is fed into carbon dioxide at a rate of 400mL / min for 3s until the pH of the slurry is 7, and the ventilation is stopped;

[0038] (5) Centrifugal filtration, dehydration drying, crushing and packaging.

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Abstract

The invention discloses a production technology of calcium carbonate powder. The production technology comprises steps as follows: marble is smashed, and marble powder is obtained; the marble powder is calcined; the calcined marble powder is put in a first reaction tank and digested with water in the tank, impurities are removed by filtering, and a filtrate is put in a second reaction tank; carbondioxide is introduced into the second reaction tank by pulses for carbonization; centrifugal filtration, dewatering, drying, smashing and packaging are performed. The production technology of the calcium carbonate powder has advantages as follows: limestone is more sufficiently cracked into quick lime, and product purity can be improved; carbon dioxide is introduced by splitting in a pulse mannerand can be subjected to a reaction with calcium hydroxide sufficiently, the residual amount of calcium hydroxide is reduced, pH value of a solution in the reaction tank is reduced, and pollution is reduced; the utilization rate of carbon dioxide is increased.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to the technical field of calcium carbonate production. Background technique [0002] Calcium Carbonate (CaCO 3 ) is an inorganic compound, commonly known as: limestone, limestone, stone powder, marble, etc. Calcium carbonate is neutral and basically insoluble in water. It exists in aragonite, calcite, chalk, limestone, marble, travertine and other rocks, and is also the main component of animal bones or shells. Calcium carbonate is also an important building material and is widely used in industry. [0003] The traditional production of calcium carbonate process is to pass carbon dioxide gas into the suspension of a certain concentration of Ca(OH)2 for carbonization, but there is generally insufficient mixing of carbon dioxide and calcium hydroxide, and the mixed product after the reaction still contains a certain amount of Calcium hydroxide, the calcium hydroxide in...

Claims

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Application Information

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IPC IPC(8): C01F11/18C04B2/10C04B2/04
CPCC01F11/181C04B2/045C04B2/10
Inventor 龚四芽
Owner 连平县鑫福建材有限公司