Vulcanized and modified corn straw soil repairing conditioner and preparation method thereof

Abstract

The invention discloses a vulcanized and modified corn straw soil repairing conditioner. The vulcanized and modified corn straw soil repairing conditioner is composed, by weight, of 52-73 parts of red mud, 17-24 parts of zeolite, appropriate distilled water, 22-35 parts of humus, 2-5 parts of gypsum powder, appropriate NaCl solutions with the concentration being 1.0 mol / L, 3-8 parts of ferric chloride, 2-5 parts of ferrous sulfate, appropriate strong ammonia water, 2-6 parts of corn straw, 1-3 parts of biochar and 0.3-1 part of thiourea. The zeolite is combined with magnetic iron oxide particles, a magnetic zeolite composite with the adsorption characteristic is prepared, so that the secondary pollution problem generated from the situation that heavy metal elements are still retained in soil at the time of normal processing is avoided; and then red mud particles are wrapped and pelletized to achieve the effect that slow releasing of OH ions is controlled, the releasing speed of free alkali in the red mud is reduced, and the vulcanized and modified corn straw soil repairing conditioner is beneficial to achieving effective and stable solidifying of heavy metal ions in the soil.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control, and more specifically relates to a vulcanized modified corn stalk soil repair conditioner 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 continuousl...

AI Technical Summary

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