Red mud-based modified particle soil remediation material and preparation method thereof

Abstract

The invention discloses a red mud-based modified particle soil remediation material which contains the following raw materials in parts by weight: 50-75 parts of red mud, 13-20 parts of zeolite, appropriate distilled water, 18-27 parts of humus, 2-5 parts of gypsum powder, appropriate 1.0mol / L NaCl solution, 5-7 parts of iron chloride, 3-5 parts of ferrous sulfate and appropriate stronger ammonia water. According to the invention, the zeolite and magnetic iron oxide particles are combined to prepare a magnetic zeolite complex with adsorption characteristic, and the problem of secondary pollution caused by conventional treatment in which heavy metal elements are still kept in soil is avoided; after that, through coating with red mud particles and granulation treatment, an effect of controlling slow release of OH<-> ions is realized, the release speed of free alkali in red mud is lowered, and effective stabilization and solidification of heavy metal ions in soil are facilitated.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control, and more specifically relates to a red mud-based modified granular soil repair material and a preparation method thereof. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. However, heavy metal pollution in farmland soil is extremely harmful. Heavy metal pollution in soil will not only reduce crop yield and quality, but also enter the human body through the soil-plant system and the food chain, endangering human health and life safety. [0003] Red mud is the residue produced in the process of alumina production. It is rich in oxides of iron, aluminum and calcium, which can reduce the solubility and bioavailability of metals. It can continuously ...

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Problems solved by technology

However, at present, when red mud is used in pollution control and ecological restoration, red mud powder is basically used directly. Due to the rapid release of free alkali, the pH of the soil rises rapidly, causing serious harm to vegetation and soil microorganisms.

[0004] Luo Huili, Huang Shengsheng, et al., in their article "Research on Red Mud Modified Granular Restoration Materials and Its In-Situ Stabilization of Lead-Zinc Contaminated Soil", used the potential gelation of alumina industrial waste residue-red mud, and drums at room temperature Red mud-phosphorus composite particles were prepared by granulation, and applied to the in-situ stabilization and remediation of lead-zinc polluted soil, although the red mud-phosphorus composite soil remediation agent prepared by this method can neutralize part of the OH of red mud - , but it is easy to cause the accumulation of phosphorus in the soil, resulting in the problem of phosphorus enrichment in surface water