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Method for molding powder calcium oxide

A molding method and calcium oxide technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve problems such as difficulty in technology promotion, achieve effective utilization, realize resource utilization, and be beneficial to environment and ecological protection. Effect

Active Publication Date: 2016-11-16
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gypsum and industrial by-product Gypsum will produce powdered calcium oxide during the production of sulfuric acid co-production cement. Powdered calcium oxide is used to produce cement, but it is difficult to promote its technology due to many reasons

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Press 80-200 mesh powdered calcium oxide into a ball shape in a pressure molding machine to make it a diameter of 10mm, pass it into the air containing 20% ​​water vapor at 110°C, take it out after 20 minutes, put it into the drying tower, and pass it into the The flue gas at 950°C is taken out after 20 minutes, and the powdered calcium oxide is prepared into granular calcium oxide of about 10mm.

Embodiment 2

[0023] Press 100-200 mesh powdered calcium oxide into a spherical shape in a pressure molding machine to make it a diameter of 20mm, and pass it into air containing 10% water vapor and 10% carbon dioxide at 110°C, take it out after 20 minutes, and put it in a dry place. The tower is fed with flue gas at 950°C and taken out after 20 minutes, and the powdered calcium oxide is prepared as granular calcium oxide with a diameter of about 20mm;

Embodiment 3

[0025] Press 100 mesh-200 mesh powdered calcium oxide into a spherical shape in a pressure molding machine to make it a diameter of 20mm, pass in steam at 105°C, take it out after 5 minutes, put it into a drying tower, and pass in smoke at 950°C Dao gas, take it out after 20 minutes, and the powdered calcium oxide is prepared as granular calcium oxide of about 20mm;

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PUM

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Abstract

The invention discloses a method for molding powder calcium oxide. The method comprises the following steps: pressing powder calcium oxide to a certain shape by using a tablet press or other pressing machines, introducing a gas with carbon dioxide or water vapor, after a certain time, introducing a flue gas of a certain temperature, thereby preparing calcium oxide of certain granularity and strength from the powder calcium oxide. By adopting the method, calcium carbide can be produced from quick lime which is prepared from decomposed powder calcium oxide instead of limestone, the powder calcium oxide is a byproduct of production of sulfuric acid produced from gypsum which is an industrial byproduct, and thus the raw material source of the calcium carbide industry can be widened.

Description

technical field [0001] The invention relates to a molding method of powdered calcium oxide, in particular to a molding method of calcium oxide powder generated after decomposition of gypsum and industrial by-product gypsum. Background technique [0002] Calcium oxide is the main raw material for the production of calcium carbide. Powdered calcium oxide is directly used in the production of calcium carbide by the electrothermal method to form a closed material layer with poor air permeability, which will cause the pressure in the molten pool to be suppressed, and the feeding of the molten pool is slow. In severe cases, explosion accidents may occur. Production requires calcium oxide to have a certain particle size, and powdered calcium oxide cannot be directly used in the production of electrothermal calcium carbide without processing. However, many industrial processes will produce powdered calcium oxide. If the powdered calcium oxide can be molded to have a certain particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02C01B31/32
CPCC01F11/02
Inventor 罗焕虎陈前林郭妤敖先权
Owner GUIZHOU UNIV