T/MIARA 012-2024 The complete component high-value integrated utilization system for coal gangue requires synergistic utilization

Scope

Scope: This document specifies the terms and definitions, general principles, process routes, energy consumption requirements for equipment and facilities, full-component products, energy consumption evaluation, and management system requirements for the high-value comprehensive utilization of coal gangue. This document is applicable to the treatment of coal gangue solid waste and energy consumption evaluation and management. Main technical content: 5.2 Production process 5.2.1 Crushing and grinding: Coal gangue is crushed to form a powder with a particle size of more than 20-100 mesh. 5.2.2 Activation: Under low-temperature conditions, by controlling parameters such as components, temperature, pressure, and residence time, a multi-component mixture is obtained. 5.2.3 Hierarchical utilization: The activated coal gangue is screened by particle size, and the coarse particles are used for airgel and high-value metal element extraction. 5.2.4 Magnetic separation: After activation, the solution is separated by high-speed rotation of magnetic separation equipment. 5.2.5 High-viscosity ionic slurry solid-liquid separation: The solution after magnetic separation is treated with acid, and solid-liquid separation is carried out to obtain silicon carbide and silica. The remaining solution is further treated by adjusting the pH value. 5.2.6 Alkali dissolution and neutralization solid-liquid separation: The solid residue is treated with alkali solution to obtain high-purity chemical products such as aluminum hydroxide, manganese hydroxide, titanium dioxide, and tellurium oxide. High-salt wastewater is used in conjunction with CO2 and NH3?H2O to prepare NaHCO3 and NH4Cl for recycling, achieving high-value conversion and utilization of carbon dioxide and recycling; hierarchical utilization of thermal energy.

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