Coal gangue decarburization process

Abstract

The invention relates to a coal gangue decarburization process which comprises the following steps of: 1, crushing, grinding and drying a coal gangue raw material; 2, fully premixing the coal gangue raw material treated in the step 1 with combustion-supporting gas in a mixing nozzle, spraying the mixture into a reaction chamber through the mixing nozzle, and before the mixture is sprayed into the reaction chamber, igniting and heating the mixture through an auxiliary fuel nozzle of the reaction chamber, and then spraying the mixture into the reaction chamber, so as to enable the coal gangue raw material to be subjected to combustion reaction in the reaction chamber for oxidation and decarburization; and 3, after the combustion reaction, feeding high-temperature flue gas, small-particle coal gangue powder and large-particle coal gangue powder into a settling chamber, enabling the large-particle coal gangue powder to fall into the settling chamber due to the dead weight, enabling the high-temperature flue gas carrying the small-particle coal gangue powder to enter gas-solid separation equipment, separating the small-particle coal gangue powder and the flue gas in the gas-solid separation equipment, and using the obtained small-particle coal gangue powder for subsequent production. The coal gangue powder in the process is large in reaction surface area, the reaction is faster and more uniform, decarburization is uniform, the decarburization efficiency is high, and the productivity is high.

Description

technical field [0001] The present disclosure relates to the technical field of coal gangue decarbonization, in particular to a coal gangue decarbonization process. Background technique [0002] Coal gangue is the waste residue produced during the coal mining process, including the excavation gangue during the roadway excavation process, the gangue extracted from the roof, floor and interlayer during the coal mining process, and the gangue during the coal washing process. A low-carbon, relatively hard solid waste associated with coal seams is also an available resource. Coal gangue with high carbon content (more than 20%) can be directly used as fuel for fluidized fluidized furnaces; those with low carbon content, less than 6%, can be used in the production of building materials such as bricks, tiles, and cement; The low ones can be filled into pits or used as roadbed materials. [0003] The carbon content of most coal gangue is The firing of high-performance gangue cera...

AI Technical Summary

Problems solved by technology

The carbon content in coal gangue, the raw material of ceramsite, is too high. At present, the main solution is to add a large amount of auxiliary materials such as clay and shale to reduce the carbon content of the mixed raw materials. This requires mining mountains, digging rivers to collect sand, lead to the destruction of the ecological environment

The Chinese invention patent application with the application number CN201810034270.2 discloses a coal gangue resource decarbonization process. After the coal gangue is crushed, it is preheated for 3-7 hours, and then it is calcined in a rotary kiln for 5-12 hours for decarbonization, and then cooled. The product was obtained, which solved the problems of quarrying in mountains, digging rivers to fetch sand, and damage to the ecological environment. However, the existing decarbonization technology has the problems of uneven decarbonization, low decarbonization efficiency, and low productivity.

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