CN-121988594-A - Method for accelerating reconstruction of solid waste into soil in mining industry by photoelectric oxygen production

Abstract

The invention discloses a method for accelerating the reconstruction of solid waste into soil in mining industry by photoelectric oxygen production, which belongs to the technical field of ecological utilization of solid waste and comprises the steps of generating electricity by a solar power generation device in daytime, wherein the generated electricity is used for an electrolytic oxygen production and hydrogen production device, and the electrolytic oxygen production and hydrogen production device generates hydrogen and oxygen; the method comprises the steps of inputting oxygen into a mining solid waste pile body through a pressurized pipeline in daytime, forming a local strong oxidation environment through gas stirring and diffusion, forming a reduction environment after oxygen in the night solid waste pile body is completely consumed, and recycling the steps to obtain the treated solid waste pile body as ecological restoration soil. The invention utilizes solar energy to generate oxygen for hydrogen production, realizes oxidation and environmental stabilization of solid waste with low cost, utilizes the difference of oxygen generation at night and day to construct chemical weathering and biological weathering circulation of oxidation-reduction alternation with low cost, accelerates the weathering and soil formation process of mineral solid waste, and effectively promotes the proliferation and biological weathering effects of aerobic soil microorganisms by injecting oxygen into the mineral solid waste pile.

Inventors

• Shi Canhai
• ZHAO QUN
• HU XUEWEI
• LIU MINGSHENG
• ZENG WEI
• LAN RONG
• DENG QI
• YANG SONGHUA
• TIAN SENLIN
• SONG HAORAN

Assignees

• 昆明有色冶金设计研究院股份公司
• 昆明理工大学

Dates

Publication Date

20260508

Application Date

20260212

Claims (8)

1. 1. The method for reforming solid waste into soil in the photoelectric oxygen production accelerating mining industry is characterized by comprising the following steps of: S1, generating electricity through a solar power generation device in daytime, wherein the generated electricity is used for an electrolytic oxygen-making hydrogen production device, and the electrolytic oxygen-making hydrogen production device generates hydrogen and oxygen; s2, inputting oxygen into the mining solid waste pile through a pressurized pipeline in daytime, and forming a local strong oxidation environment through gas stirring and diffusion; S3, the oxygen in the night solid waste stack body is completely consumed, and a reducing environment is formed; s4, circulating the steps S1-S3, wherein the treated solid waste pile is used as ecological restoration soil.
2. 2. The method for reconstructing solid waste in the mining industry into soil by accelerating photoelectric oxygen production according to claim 1, wherein the solid waste in the solid waste pile in the mining industry in the step S2 is one or more of gangue, tailings, hydrometallurgical slag, red mud and mining waste earth and stones.
3. 3. The method for accelerating the reconstruction of solid wastes into soil in mining industry by photoelectric oxygen production according to claim 1 or 2, wherein the solid waste heap in mining industry in the step S2 is a gas-solid phase heap or a solid-liquid phase heap.
4. 4. The method for accelerating the reconstruction of solid wastes in mining industry by photoelectric oxygen production according to claim 1, wherein when the local strong oxidation environment in the step S2 is a liquid-solid phase, the dissolved oxygen is controlled to be 0.1 mg/L-10 mg/L, and when the local strong oxidation environment is a gas-solid phase, the oxygen content is 1% -90%.
5. 5. The method for accelerating the reconstruction of solid waste into soil in mining industry by photoelectric oxygen production according to claim 1, wherein the gas stirring and diffusion in the step S2 is specifically microporous aeration with the aperture of 0.1 mm-1 mm, mesoporous aeration with the aperture of 1 mm-3 mm or macroporous aeration with the aperture of 3 mm-10 mm.
6. 6. The method for accelerating the reconstruction of solid wastes into soil in mining industry by photoelectric oxygen production according to claim 1, wherein the cycle of the step S4 is 1 day to 150 days alternately day and night.
7. 7. The method for reforming solid waste into soil in the mining industry by accelerating photoelectric oxygen production according to claim 1, wherein if the pH of the solid waste pile after the treatment in the step S4 is more than 9 or less than 5, dealkalization or deacidification treatment is carried out first, and the treated solid waste pile is used as ecological restoration soil.
8. 8. The method for accelerating the reconstruction of solid wastes into soil for mining industry by photoelectric oxygen production according to claim 1 or 7, wherein the processed solid waste pile is supplemented with nutrient substances.

Description

Method for accelerating reconstruction of solid waste into soil in mining industry by photoelectric oxygen production Technical Field The invention belongs to the technical field of ecological utilization of solid wastes, and particularly relates to a method for accelerating reconstruction of solid wastes into soil in mining industry by photoelectric oxygen production Background A large amount of mining solid waste (including coal gangue, tailings, red mud and the like) is generated in the resource development process, and the stockpiling pressure occupies the land, so that ecological damage is caused. The solid waste pile body contains a large amount of primary minerals, the primary environment is a high-temperature high-pressure anoxic atmosphere, the surface pile-up environment is a normal-temperature normal-pressure oxygen-enriched atmosphere, and the minerals have a continuous natural weathering trend. However, the solid waste pile body in mining industry can only oxidize and weather the surface layer of the solid waste due to the influence of mass transfer resistance, and the interior of the pile body is still in an anoxic environment, so that the reconstruction of the solid waste in mining industry into soil and the ecological utilization are severely restricted. Li Qingzhu et al studied the utilization of a new paradigm of "soil-like" of bulk industrial solid wastes (2025), which indicated that mine solid wastes and tailings are high in sulfur content, long-term open-air stockpiling, and continuous oxidation of sulfides leads to yard acidification. At present, a large number of solar power generation equipment is built on the surfaces of a large amount of solid waste storage sites such as a tailing pond, a coal gangue storage site, a red mud storage site and the like, and the generated energy is unstable due to the fact that the solar power generation equipment is easily affected by overcast and rainy weather, so that disordered power generation is difficult to access a power grid. Currently, the emerging mode of solar power generation for hydrogen production by water electrolysis as solar energy utilization is widely focused, but the byproduct oxygen in the electrolysis process lacks a nearby use way, so that resource waste is caused. Therefore, it is very necessary to develop a method which can treat solid waste piles in mining industry in situ, has low cost and accelerates the reconstruction of soil. Disclosure of Invention Aiming at the problems of unstable environment and difficult weathering of middle and lower layers in the solid waste pile body of the mining industry in the prior art, the invention aims to provide a method for accelerating the reconstruction of the solid waste of the mining industry by photoelectric oxygen generation. The object of the invention is achieved in that it comprises the following steps: S1, generating electricity through a solar power generation device in daytime, wherein the generated electricity is used for an electrolytic oxygen-making hydrogen production device, and the electrolytic oxygen-making hydrogen production device generates hydrogen and oxygen; s2, inputting oxygen into the mining solid waste pile through a pressurized pipeline in daytime, and forming a local strong oxidation environment through gas stirring and diffusion; S3, the oxygen in the night solid waste stack body is completely consumed, and a reducing environment is formed; s4, circulating the steps S1-S3, wherein the treated solid waste pile is used as ecological restoration soil. The pressurizing pipeline can be provided with a valve, the daytime valve is in an open state, and the night valve is in a closed state. Preferably, the solid waste of the solid waste pile body of the mining industry in the step S2 is one or more of coal gangue, tailings, hydrometallurgy slag, red mud and mining waste earth and stones. Preferably, the solid waste pile body in the mining industry in the step S2 is a gas-solid phase pile body or a solid-liquid phase pile body; the gas-solid phase pile body is a loose dry solid waste pile body, the gas-solid phase pile body is arranged inside, the porosity is 10% -30%, the gas flow is not smooth, and the gas-solid phase pile body is in an anoxic atmosphere, the solid-liquid phase pile body is a solid waste pile body with higher humidity, the water content is 10% -30%, the inside is mainly solid-liquid mixed phase, the dissolved oxygen is close to zero, and the oxidizing atmosphere is insufficient. Preferably, when the local strong oxidation environment in the step S2 is a liquid-solid phase, the dissolved oxygen is controlled to be 0.1 mg/L-10 mg/L, and when the local strong oxidation environment is a gas-solid phase, the oxygen content is controlled to be 1% -90%. Preferably, the gas stirring and diffusing in the step S2 is specifically microporous aeration with the aperture of 0.1 mm-1 mm, mesoporous aeration with the aperture of 1 mm-3 mm or macroporous aeration