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Production of superfine calcium carbonate from carbide slag

A technology of ultra-fine calcium carbonate and carbide slag, applied in the direction of calcium carbonate/strontium/barium, etc., can solve problems such as large environmental pollutants, and achieve the effects of improving the environment, reducing production costs and saving costs

Inactive Publication Date: 2006-11-01
卢忠远
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods are all terminal treatment technologies and will still produce a large amount of environmental pollutants

Method used

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  • Production of superfine calcium carbonate from carbide slag
  • Production of superfine calcium carbonate from carbide slag
  • Production of superfine calcium carbonate from carbide slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 After drying the carbide slag at a temperature of 105°C, use NH 4 Cl solution is dissolved, and the pH value of the solution is 6. After removing the residue, add sodium stearate, control the amount of sodium stearate to be 0.5% of the weight of calcium carbonate after generation, and then feed CO 2 gas, and control the reaction temperature at 2-6°C. After drying, the product is analyzed by scanning electron microscope, and the crystal form is as follows: figure 1 Calcite-type calcium carbonate in shape.

Embodiment 2

[0023] Example 2 After drying the carbide slag at a temperature of 100°C, use NH 4 Dissolve the CI solution, the PH value of the solution is greater than 7, add sodium stearate after removing the residue, control the amount of sodium stearate to be 0.4% of the weight of calcium carbonate after generation, and then introduce CO 2 Gas, and control the reaction temperature at 8 ~ 15 ° C, after drying, the product is analyzed by scanning electron microscope, and the crystal form is as follows: figure 2 The shape of vaterite calcium carbonate.

Embodiment 3

[0024] Example 3 After drying the carbide slag at a temperature of 105°C, use NH 4 Dissolve the Cl solution, the pH value of the solution is greater than 6, add sodium stearate after removing the residue, control the amount of sodium stearate to be 0.1% of the weight of calcium carbonate after generation, and then feed CO 2 gas, and the reaction temperature is controlled at 70-90°C. After drying, the product is analyzed by scanning electron microscope, and the crystal form is as follows: image 3 The shape of aragonite calcium carbonate.

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Abstract

Production of superfine calcium carbonate from carbide slag is carried out by dissolving dried carbide slag by NH4Cl solution, removing residue, adding into sodium stearate, inducing CO2 in range of 2-100 degree and obtaining slab, spherical and acicular calcium carbonate. It is cheap, has higher additional value and no second environmental pollution.

Description

Technical field [0001] The invention relates to a method for preparing calcium carbonate by using calcium carbide slag, in particular a method for preparing superfine calcium carbonate by using a chemical precipitation method using calcium carbide slag as a raw material. Background technique [0002] Calcium carbide is an important chemical raw material, which is widely used in plastic preparation, welding and cutting, and the corresponding amount of carbide slag produced is particularly huge. According to survey statistics, the annual production of calcium carbide slag in the country reaches more than 18 million tons. At present, there is no good treatment and recycling method for calcium carbide slag at home and abroad. It is mainly used in the production of interior wall coatings, light calcium carbonate, cement, carbonized bricks, waste water treatment, accidental chlorine gas treatment, and desulfurization agent. or sulfur fixative, etc. However, the above methods are ...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 卢忠远姜彩荣涂铬旌
Owner 卢忠远
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