A method for anti-condensation in the process of reusing dry calcium carbide slag

Abstract

The invention provides a method for anti-condensation in the process of reusing dry calcium carbide slag. The method includes adding a dehumidifier in the impurity removal process of the dry process carbide slag reuse process, and mixing the dry calcium carbide slag and the dehumidifier. In the desiccant, the content of particles with a particle diameter of <50 microns is ≥80wt%, and the content of particles with a particle diameter of <20 microns in the desiccant is ≥40wt%. The short-range resource utilization technology of dry calcium carbide slag reduces the risk of bag dust and corrosion on the surface of the bag filter, and reduces the frequency of equipment maintenance. The method is simple and does not affect product performance, effectively solving the problem of dry calcium carbide slag. Difficulties in the process of slag recovery have good economic and social value.

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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