Microwave activation of coal gangue to prepare geopolymer material and method thereof

Abstract

The invention provides a method for preparing geopolymer materials by microwave activation of coal gangue, which includes the following steps: S1: raw material preparation and preliminary treatment: adding triethanolamine to the coal gangue after crushing and entering the grinding process; S2: mid-term treatment: The coal gangue powder processed in step S1 is blown into the microwave processor with an air flow, and the temperature is raised to 600-800°C, and then heat-preserved in the microwave processor for 1-6 hours to obtain the heat-treated coal gangue material; S3: cooling treatment and secondary Grinding: the gangue material processed in step S2 enters the cooling process, and is cooled to room temperature T+50°C, and the amorphous state of silicon-aluminum oxide in the gangue material is maintained during the cooling process, and the gangue material after cooling is passed through The secondary grinding of the vertical mill finally obtains geopolymer raw material powder, and then prepares geopolymer material from the geopolymer raw material powder. The invention provides an environment-friendly, energy-saving and consumption-reducing method for preparing geopolymer materials through microwave activation of coal gangue. The prepared geopolymer has the characteristics of fast molding and excellent mechanical properties.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste and materials, and particularly relates to a method for preparing geopolymer material by microwave activation of coal gangue. Background technique [0002] Coal gangue, that is, associated with coal, is a relatively hard material with very low C content, and is a black-gray substance mixed in coal seams, and is a solid waste discharged during coal mining and washing. In the energy industry, the utilization of coal gangue waste is not only conducive to improving the environment, protecting the ecology, but also promoting the sustainable development of the national economy. [0003] The main chemical composition of coal gangue is: SiO 2 The content is about 40% to 55%, Al 2 O 3 The content is about 15% to 40%, Fe 2 O 3 The content is about 2% to 10%, and the content of CaO is about 1% to 10%. In addition, it also contains a small amount of MgO and K 2 O, Na 2 O and rare...

AI Technical Summary

Problems solved by technology

However, after years of practice, it has been proved that coal gangue power generation has considerable pollution to the environment, which is not conducive to environmental protection; the recovery of valuable minerals will generate new pollution sources, and in some areas the permanent pollution sources produced by the recovery of minerals are still dangerous wastes. The degree of environmental damage is greater, and it is obviously not worth the loss; the performance of the prepared building materials is not high because there are some C and C compounds in the production of building materials, the application scenarios are limited, the consumption is low, and the social benefits are not significant; As for the production Compound fertilizer, because the elements contained in the coal gangue-themed raw materials fluctuate greatly, the production process is complicated, the overall cost is high, and the usage is less; other fields such as mining area backfilling and other technical solutions can also consume a large amount of coal gangue But the added value is not high, and the economic benefits are not significant

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