Anti-condensation method in dry carbide slag recycling process

Abstract

The invention provides an anti-condensation method in a dry carbide slag recycling process. The method comprises the following steps of adding a dehumidizer in an impurity removal process in the dry carbide slag recycling process, and mixing dry carbide slag and the dehumidizer, wherein the content of particles with the particle diameter smaller than 50 microns in the dehumidifier is greater than or equal to 80wt%, and the content of particles with the particle diameter smaller than 20 microns in the dehumidifier is larger than or equal to 40wt%. According to the method, the moisture absorption condensation performance of the dry carbide slag is avoided, the resource short-distance utilization technology of the dry carbide slag is optimized, the risks of bag pasting and corrosion of the surface of a bag type dust collector are reduced, the equipment maintenance frequency is reduced, the method is simple in process, product performance is not affected, the difficulty in the dry carbide slag recycling process is effectively solved, and good economic and social value is achieved.

Description

technical field [0001] The invention relates to the technical field of resource recycling, in particular to a method for anti-condensation during the reutilization of dry calcium carbide slag. Background technique [0002] Carbide slag is solid waste produced during the process of preparing acetylene from calcium carbide and water. The polyvinyl chloride (PVC) industry discharges 18 million tons of carbide slag every year. The main component of calcium carbide slag is calcium hydroxide, the content can reach 80~90wt%, which has great potential utilization value, but the residual impurity particles will affect the efficiency of the desulfurization process and the quality of the by-product desulfurization gypsum on the one hand, and on the other hand, the coarse Hard and large-particle impurities will cause wear and tear on equipment, so the recycling of calcium carbide slag first needs to separate and process the impurities through mechanical and gravity methods. In the sepa...

AI Technical Summary

Problems solved by technology

In the separation process, the residual moisture in the dry calcium carbide slag will be redistributed during the interaction with the gas, enriched, condensed, and even hardened inside the equipment, causing equipment damage, which is not conducive to the resource utilization of dry calcium carbide slag , is a technical problem that needs to be solved urgently

[0003] CN104190243A discloses a method and equipment for desulfurizing calcium carbide slag in a coal-fired boiler. The method includes drying the calcium carbide slag until the moisture content is less than 2wt%; blowing the calcium carbide slag into the furnace of the coal-fired boiler with a Roots blower, The blowing position is the secondary air inlet elbow under the front and rear walls of the furnace, and the number of blowing points is 4 on each of the front and rear walls of the furnace. The dried calcium carbide slag is directly used for desulfurization in the furnace, but the cost of drying treatment is high

[0004] CN107213779A discloses a production system and production process of calcium carbide slag desulfurizer. The production system includes: calcium carbide slag drying and crushing system, tail gas treatment system and collection and storage system, and calcium carbide slag is used as Desulfurization agent in the furnace, but the residual moisture is treated by drying, and the cost of drying is relatively high

[0005] CN108704470A discloses a calcium carbide slag composite calcium-based desulfurizer based on biomass conditioning and its preparation method. The desulfurizer utilizes biomass to mix with wet carbide slag to adjust the moisture in the wet carbide slag, thereby eliminating the need for heating and drying processes. Solve the problem of entering the furnace of wet calcium carbide slag under certain conditions, but it takes a long time for air-drying and tempering

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