Method of comprehensively utilizing precipitator ash and slag of calcium carbide furnace

Abstract

The invention relates to a method of comprehensively utilizing precipitator ash and slag of a calcium carbide furnace. In the method, a calcium carbide furnace precipitator ash collecting system, a conveying system, an incineration system, an ash conveying system and a cement production system are mainly utilized; the calcium carbide furnace precipitator ash passes through a dust cabin, and is fed to an incineration device sequentially through a pressurizing device, a buffer device and an ejector of the conveying system; the calcium carbide furnace precipitator ash and coal ash accelerated by the ejector enter a combustion section of the incineration device, a cooling device is arranged at the outlet of the incineration device, and the cooled ash enters a cement raw material section through the ash conveying system by a conveying pump. The method provided by the invention mainly solves the problem of conveying and utilizing the calcium carbide furnace precipitator ash and slag. Meanwhile, two kinds of slag are comprehensively utilized by virtue of one process, so that the purposes of efficiency, energy conservation and environmental protection are realized.

Description

technical field [0001] The invention relates to a method for controlling blast furnace dust dust pollution in the metallurgical industry in the field of environmental protection, and is particularly suitable for comprehensive utilization of calcium carbide furnace dust and blast furnace slag. Background technique [0002] In the production process of the closed calcium carbide furnace, about 40kg of dust is produced per ton of calcium carbide, and its main components (mass fraction): CaO 58% to 65%, C 18% to 25%, SiO 2 5%~8%, MgO 1%~5%, Al 2 o 3 1%~2%, Fe 2 o 3 About 1%, the dust is very fine particles, its specific gravity is light, the specific surface area is large and has a certain viscosity, and it is insoluble in water. Because it contains carbon, phosphorus, sulfur and other substances, the dust is flammable after contact with air , Explosive, and there are great safety hazards, so it is difficult to transport and handle; at the same time, during the drying proc...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems in the prior art, such as backward treatment process of calcium carbide furnace dust and slag, serious environmental pollution, high recycling cost, difficult transportation, and inability to use directly, etc., and then provides a simple and comprehensive The process is closed transportation and treatment, no pollution, low recycling cost, and a method for producing high-quality cement raw materials at the same time

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