Gangue treatment method and application

Abstract

The invention relates to the technical field of gangue treatment, in particular to a gangue treatment method and application. The treatment method comprises the steps of pickling gangue powder; addingwater for granulation after removing pyrites from the gangue powder, and obtaining gangue based microspheres; dipping the gangue based microspheres in solutions containing ferric salt and zinc salt,and obtaining dipped microspheres; performing ozone aeration and ultrasonic treatment to the dipped microspheres, and obtaining activated gangue microspheres; adding alkali to the activated gangue microspheres for solid-liquid separation, and obtaining activated gangue; and mixing the activated gangue and sodium alginate aqueous solutions, and obtaining gangue engineering soil through drying. Recovery and reuse of gangue are achieved, and the pyrite content of the end-product gangue engineering soil is reduced obviously; the phenomena of heat accumulation and gangue heating, even spontaneous combustion in the later accumulation process can be avoided greatly; the security threat is reduced, and the mechanical property of the gangue engineering soil is excellent, and can be applied to grainfor green land, engineering construction land and high-grade highway construction projects.

Description

technical field [0001] The invention relates to the technical field of coal gangue treatment, in particular to a treatment method and application of coal gangue. Background technique [0002] Coal gangue is solid waste produced during coal mining and coal preparation, containing organic matter and pyrite (FeS 2 ), can be oxidized by oxygen in the air and release heat. With the accumulation of heat, the temperature of gangue gradually rises. When the temperature rises to the ignition point of gangue and combustibles (300-350°C), spontaneous combustion will occur. CO and SO produced by spontaneous combustion 2 Harmful gases such as gas can pose a serious threat to the ecological environment, enterprise production safety and employee health. Spontaneous combustion of coal gangue releases a large amount of SO 2 , CO, CO 2 、H 2 S. NO X The gas emits a certain amount of toxic substances such as nitrogen oxides and benzopyrene into the air, and the dust in the smoke gangue w...

AI Technical Summary

Problems solved by technology

The current production units adopt treatment methods, such as digging trenches and layering, and covering each layer with loess; or directly stacking layers on the ground and burying the loess. These methods cannot fundamentally solve the problem of spontaneous combustion, and spontaneous combustion will still occur after a long time Phenomena, re-treatment is not only costly, but also causes serious pollution to air, soil and groundwater resources in the process, all of which are methods that treat the symptoms but not the root cause

Combined with the current development trend of our country, environmental governance in Shanxi is imminent, and the reserves of solid waste such as coal gangue in Shanxi Province are also very large. The old treatment methods can no longer meet the requirements of environmental protection, so we must seek an efficient and environmentally friendly method. Governance methods to improve the status quo and improve our environment

Images