Method for passivating metals in coal gangue with abnormal heavy metals by using solid passivator
A technology of coal gangue and passivation agent, applied in the direction of improving process efficiency, can solve the problems of heavy metal pollution of water and soil, biological survival impact, human health impact, etc., and achieve practical environmental benefits, long-lasting passivation effect, and significant passivation. effect of
Pending Publication Date: 2022-06-07
XIAN UNIV OF SCI & TECH
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Problems solved by technology
[0003] Most coal mining areas usually stack and dispose of coal gangue, which is likely to cause serious environmental problems; coal gangue stacked in the open air has been washed, leached, weathered and oxidized by rain for a long time, and toxic and harmful heavy metals such as copper , zinc, lead, chromium, cadmium, etc. are easy to enter the body and soil, causing heavy metal pollution in water and soil, affecting human health and also affecting the survival of organisms in water
Method used
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Embodiment
[0022] Embodiment: a kind of solid-state passivating agent to the passivation method of metal in abnormal heavy metal gangue, such as figure 1 The following steps are shown:
[0023] S1. Coal gangue property analysis (including industrial analysis, elemental analysis, ash composition analysis, mineral composition analysis, specific surface area analysis, scanning electron microscope analysis, and heavy metal occurrence forms);
[0024] S2, coal gangue pretreatment;
[0025] S3. Passivating the pretreated coal gangue with a solid-state passivating agent to obtain the passivating coal gangue; the screening elements of the solid-state passivating agent include: the selection of the passivating agent, the characterization of the passivating agent (component analysis, Mineral composition analysis, specific surface area analysis, infrared spectrum analysis), different ratios of passivation agents and passivation time, changes in the occurrence form of heavy metals;
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The invention discloses a method for passivating metals in heavy metal abnormal coal gangue by using a solid passivator, and relates to the technical field of coal gangue passivation, and the method is characterized by comprising the following steps: S1, coal gangue property analysis; s2, coal gangue pretreatment; s3, passivating the pretreated coal gangue by using a solid passivating agent to obtain passivated coal gangue; s4, carrying out a leaching experiment on the passivated coal gangue, and comparing the change condition of the pH value of a leaching solution along with time before and after passivation of the coal gangue and the leaching rule of heavy metals in the leaching solution; and S5, determining the passivation effect of the solid passivator on the heavy metals in the coal gangue according to the change condition of the pH value of the leachate along with time before and after passivation of the coal gangue in the step S4 and the leaching rule of the heavy metals in the leachate, so as to realize passivation of the metals in the coal gangue with abnormal heavy metals. The method can obviously reduce the effective state of the heavy metal in the coal gangue, and has the overall characteristics of short passivation time and good passivation effect.
Description
technical field [0001] The invention relates to the technical field of harmless treatment of coal gangue, in particular to a method for passivating metals in abnormal heavy metal coal gangue by a solid passivating agent. Background technique [0002] Coal gangue is the solid waste produced in the process of coal mining and beneficiation, including: rock produced during rock roadway excavation, roof and floor rocks and gangue in coal seams during coal mining, and tailings discharged during coal preparation. Coal gangue is black or dark gray in appearance, with layered or massive structure, and its hardness is generally higher than that of coal, accounting for about 10%-20% of raw coal production. [0003] Coal gangue is usually piled up and disposed of in most coal mining areas, which can easily cause serious environmental problems. Coal gangue piled up in the open has been washed, leached, weathered, and oxidized by rainwater for a long time. The toxic and harmful heavy meta...
Claims
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IPC IPC(8): A62D3/33A62D101/43
CPCA62D3/33A62D2101/43Y02P10/20
Inventor 杜美利张悦李刚刘雷刘静
Owner XIAN UNIV OF SCI & TECH