System and method for treating calcium carbide residues

Abstract

The invention discloses a system and a method for treating calcium carbide residues. The system comprises a mixing device, a water glass synthesis device, a filter device, a drying and crushing deviceand a decomposing device. A calcium carbide residue inlet, a caustic soda inlet and a mixed material outlet are formed in the mixing device; a mixed material inlet, a steam inlet and a water-glass-containing liquid outlet are formed in the water glass synthesis device, and the mixed material inlet and the mixed material outlet are connected with each other; a water-glass-containing liquid inlet,a water glass outlet and a filter cake outlet are formed in the filter device, and the water-glass-containing liquid inlet and the water-glass-containing liquid outlet are connected with each other; afilter cake inlet, a high-temperature gas inlet and a powder outlet are formed in the drying and crushing device, and the filter cake inlet and the filter cake outlet are connected with each other; apowder inlet, a quicklime powder outlet and a decomposed gas outlet are formed in the decomposing device, and the powder inlet and the powder outlet are connected with each other. The system and themethod have the advantages that silicon dioxide in the calcium carbide residues can be converted into water glass with a high economic value by the system, quicklime powder with a high calcium oxide content can be obtained by means of separation, accordingly, the calcium carbide residues can be recycled, and environmental pollution on soil, the air and the like due to the calcium carbide residuescan be prevented.

Description

technical field [0001] The invention belongs to the field of carbide slag utilization, in particular, the invention relates to a system and method for processing carbide slag. Background technique [0002] At present, tens of millions of tons of calcium carbide slag are produced in my country every year, and the stacking of strong alkaline calcium carbide slag not only occupies a large amount of land, but also because calcium carbide slag is easy to lose and spread, pollutes water resources near the stacking site, and alkalizes the land. It may also be stacked for a long time Air-dried and dusty, polluting the surrounding environment. Carbide slag contains impurities such as silicon dioxide, magnesia, and alumina, and the content of calcium oxide is low, which directly leads to the inability of calcium carbide slag to be reused in the production of calcium carbide. [0003] Therefore, the resource utilization of carbide slag is imminent. Contents of the invention [0004]...

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Problems solved by technology

[0002] At present, tens of millions of tons of calcium carbide slag are produced in my country every year, and the stacking of strong alkaline calcium carbide slag not only occupies a large amount of land, but also because calcium carbide slag is easy to lose and spread, pollutes water resources near the stacking site, and alkalizes the land. It may also be stacked for a long time Air-dried and dusty, polluting the surrounding environment

Carbide slag contains impurities such as silicon dioxide, magnesia, and alumina, and the content of calcium oxide is low, which directly leads to the inability of calcium carbide slag to be reused in the production of calcium carbide

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