Coal will remain my country's main primary energy source for a long time to come. With coal mining and utilization, a large amount of coal-based solid waste will be generated. At present, my country's coal gangue accumulation has exceeded 4 billion tons, and the fly ash accumulation has exceeded 3 billion tons; the annual emissions of coal chemical ash generated by coal gasification, liquefaction, etc. will approach 100 million tons. Huge amounts of coal-based solid waste have become a serious obstacle to the development of provinces, cities or enterprises that mainly export or utilize coal. This technology adopts an interfacial activation method to induce the generation of aluminosilicate structural defects, which can effectively improve the chemical reaction activity of coal-based solid waste under the synergistic effect of a small amount of additives. Then, a large amount of industrial by-product dilute hydrochloric acid (concentration 6%) or sulfuric acid (concentration 50%) is used as leaching agent to obtain a variety of high value-added chemical products. In addition to removing residual carbon in the ash, the residue can be reduced by more than 60%; The reaction residue is used to prepare light and high-strength thermal insulation building materials (fire protection rating reaches Class A) and soil improvement. Features of this technology: low energy consumption: low activation temperature (some raw materials can be activated at room temperature), and unit energy consumption is far low. High extraction rate: 85%. Low raw material requirements: raw materials do not require ultra-fine grinding and carbon removal, and industrial waste acid is used as the leaching agent. There are many product types: depending on different leaching agents, polyaluminum chloride, polyaluminum ferric chloride, polyaluminum calcium ferric chloride, polyaluminum sulfate, aluminum oxide, insulation plates, soil improvers, etc. can be produced. Near zero emissions: No wastewater is generated and no waste residue is discharged during the production process.  

Take the production of flocculants as an example: 4000 tons of clinker can be prepared for every 10,000 tons of dry-based ash, 7000 tons of 31% hydrochloric acid, 2200 tons of 32% liquid alkali, 500 tons of steam, 85 kWh of electricity, and 18000 tons of new flocculant products are prepared. The annual investment in processing a 100,000-ton line is about 50 - 60 million yuan (private enterprises can be lower), and the profit margin is no less than 20%.