Preparation method of high activity calcium oxide

A calcium oxide, high-activity technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems affecting the purity of calcium oxide, and achieve the goal of ensuring gradual growth, realizing effective utilization, and reducing production costs Effect

Active Publication Date: 2019-11-05
都安春旭新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above deficiencies, the present invention provides a preparation method of highly active calcium oxide, which solves the problem that impurities are easily introduced into phosphogypsum raw materials and affects the purity of calcium oxide, and obtains highly active calcium oxide products

Method used

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  • Preparation method of high activity calcium oxide

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Embodiment 1

[0021] A preparation method of highly active calcium oxide, which specifically comprises the steps of:

[0022] (1) Crush the phosphogypsum slag through a 300-mesh sieve, then raise the temperature to 250°C at a heating rate of 15°C / min to preheat the phosphogypsum slag for 20 minutes, and then raise the temperature to 500°C at a heating rate of 15°C / min. Phosphogypsum slag was calcined for 50 minutes, and then cooled to room temperature at a cooling rate of 10°C / min to obtain solid I;

[0023] (2) First wash the solid I obtained in step (1) twice with deionized water, filter and remove the filtrate, and then mix it with ammonia water with a mass fraction of 25% in a mass ratio of 1:6 to obtain a mixed solution, and then Add dihydroxyglycine to the mixed solution, the ratio of the volume of the added bishydroxyethylglycine to the volume of the mixed solution is 2:10, and then continue to feed carbon dioxide gas into the mixed solution, which can be achieved by adding 25% ammon...

Embodiment 2

[0026] A preparation method of highly active calcium oxide, which specifically comprises the steps of:

[0027] (1) Crush the phosphogypsum slag through a 200-mesh sieve, then raise the temperature to 200°C at a heating rate of 15°C / min to preheat the phosphogypsum slag for 30 minutes, and then raise the temperature to 450°C at a heating rate of 15°C / min. Phosphogypsum slag was calcined for 60 minutes, and then cooled to room temperature at a cooling rate of 10°C / min to obtain solid I;

[0028] (2) First wash the solid I obtained in step (1) with deionized water for 3 times, filter and remove the filtrate, and then mix it with ammonia water with a mass fraction of 35% in a mass ratio of 1:8 to obtain a mixed solution, and then Add dihydroxyglycine to the mixed solution, the ratio of the volume of the added bishydroxyethylglycine to the volume of the mixed solution is 3:10, and then continue to feed carbon dioxide gas into the mixed solution, which can be achieved by adding 35%...

Embodiment 3

[0031] A preparation method of highly active calcium oxide, which specifically comprises the steps of:

[0032] (1) Crush the phosphogypsum slag through a 250-mesh sieve, then raise the temperature to 280°C at a heating rate of 15°C / min to preheat the phosphogypsum slag for 15 minutes, and then raise the temperature to 400°C at a heating rate of 15°C / min. Phosphogypsum slag was calcined for 40 minutes, and then cooled to room temperature at a cooling rate of 10°C / min to obtain solid I;

[0033] (2) First wash the solid I obtained in step (1) twice with deionized water, filter and remove the filtrate, and then mix it with ammonia water with a mass fraction of 30% in a mass ratio of 1:3 to obtain a mixed solution, and then Add dihydroxyglycine to the mixed solution, the ratio of the volume of the added bishydroxyethylglycine to the volume of the mixed solution is 1:10, and then continue to feed carbon dioxide gas into the mixed solution, which can be achieved by adding 30% ammon...

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Abstract

The invention provides a preparation method of high-activity calcium oxide. The preparation method comprises the following steps: crushing phosphogypsum slag through a 200-300 mesh sieve, carrying outmicrowave calcination to obtain a solid I, washing the solid I, mixing the washed solid I with ammonia water in proportion to obtain a mixed solution, adding dihydroxyglycine to the mixed solution, continuously introducing carbon dioxide gas into the mixed solution, adjusting the pH value of the mixed solution to 9-10, performing a reaction at 30-40 DEG C under a stirring rotating speed of 500-600 r / min for 2-4 h, carrying out suction filtration to obtain a solid II, carrying out microwave calcination on the obtained solid II, and then cooling the microwave-calcined solid II to room temperature to obtain the high activity calcium oxide. The method of the invention solves the problem that the easy introduction of impurities in the production of calcium oxide from the phosphogypsum raw material affects the purity of the calcium oxide, and allows the high activity calcium oxide product to be obtained.

Description

technical field [0001] The invention belongs to the technical field of calcium oxide preparation, and in particular relates to a preparation method of highly active calcium oxide. Background technique [0002] Calcium oxide is an inorganic compound, commonly known as quicklime. Activated lime is the basic raw material of the iron and steel industry. It is also widely used in calcium carbide, electric power, glass fiber, building materials, papermaking, sewage treatment and other industries, with an annual consumption of nearly one billion tons. At present, domestic and foreign active lime production methods mainly include limestone calcination method, pure nitric acid dissolving marble method and calcium carbonate calcination method, but although these production methods have their own advantages, they also have obvious shortcomings, especially the utilization of limestone The rate is only about 70%, and the remaining finely crushed limestone forms mining waste, which is lik...

Claims

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Application Information

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IPC IPC(8): C01F11/06
CPCC01F11/06C01P2006/80
Inventor 韦明
Owner 都安春旭新材料科技有限责任公司
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