Carbide slag-based cement co-production process

Abstract

The invention discloses a carbide slag-based cement co-production process which comprises the steps of carrying out electromagnetic deironing on carbide slag, carrying out circulating capture of CO2 after drying by using residual heat of the exhaust gas of a cement plant to obtain high-purity CO2, and carrying out storage; discharging the carbide slag which circulates for certain times through a discharge pump, and feeding the carbide slag to a raw meal homogenizing silo of a cement process for mixing with other raw materials to obtain cement raw meal; and carrying out high-temperature preheating, pre-decomposition, rotary kiln calcination, grate cooler cooling and grinding on the cement raw meal to prepare cement, wherein the moisture content of the carbide slag is not higher than 12%, and SiO2 in the exhaust gas is removed through a desulfurizing tower before the carbide slag is dried. According to the carbide slag-based cement co-production process, the problems of occupation of carbide slag stacking on soil resource and environmental pollution are solved; and meanwhile, the carbon emission of the cement plant is reduced.

Description

technical field [0001] The invention belongs to the technical field of cement co-production technology, and in particular relates to a cement co-production process based on carbide slag. Background technique [0002] Currently, the world's annual CO emissions into the atmosphere 2 There are more than 30 billion tons, of which about 22% come from cement plants, steel plants and oil refineries. To reduce CO 2 emissions, CO 2 processed by capture. [0003] About CO 2 Capture, currently there are pre-combustion capture, post-combustion capture, and oxygen-enriched combustion. Among them, pre-combustion capture technology is mainly integrated gasification combined cycle (IGCC) technology; post-combustion capture mainly includes ethanolamine (MEA) adsorption method and calcium cycle (CLP) adsorption method, and ethanolamine adsorption method is only suitable for low temperature (65°C) The decarbonization cycle has low energy efficiency. The calcium cycle adsorption method us...

AI Technical Summary

Problems solved by technology

Among them, pre-combustion capture technology is mainly integrated gasification combined cycle (IGCC) technology; post-combustion capture mainly includes ethanolamine (MEA) adsorption method and calcium cycle (CLP) adsorption method, and ethanolamine adsorption method is only suitable for low temperature (65°C) The decarbonization cycle has low energy efficiency. The calcium cycle adsorption method usually uses natural limestone as the adsorbent, which is suitable for high-temperature cycle adsorption. The oxygen-enriched combustion technology is also widely used, but the oxygen-enriched combustion requires an air separation unit, which consumes a lot of energy. Carbon capture is expensive