Soil conditioner capable of being used for soil acidification conditioning and cadmium pollution repair and preparation method thereof

Abstract

The invention relates to a soil conditioner capable of being used for soil acidification conditioning and cadmium pollution repair. The soil conditioner comprises the following main components in percentage by mass: 40-60% of quicklime, 10-20% of a silicon calcium fertilizer, 10-30% of biological black carbon and 10-30% of a silicon mineral material and further comprises 1-3% of zinc sulfate and less than 10% of water, wherein the pH value is controlled at 10-12. The preparation method comprises the following steps: firstly, pre-mixing zinc sulfate with biological black carbon to obtain a premix; then, mixing quicklime, silicon calcium fertilizer, and silicon mineral material and activating the silicon mineral; and finally, mixing, granulating and drying the mixed material with activated silicon and the premixed together to obtain a finished product. The soil conditioner provided by the invention is low in cost and simple in formula, can be used for improving the pH value of soil and can be further used for soil acidification conditioning and cadmium pollution repair.

Description

technical field [0001] The invention belongs to the field of soil pollution control, and in particular relates to a soil conditioner and a preparation method thereof. Background technique [0002] At present, the cultivated land soil in southern my country generally has the following key quality problems that affect the sustainable use of soil: [0003] 1. Serious soil acidification problem. First, the natural acidification process is inevitable: due to the hot and humid climate conditions in the south, the weathering of soil silicate minerals and secondary minerals is rapid, and cations such as calcium and magnesium in the soil are lost, while aluminum hydroxide and silicon oxide colloids are accumulated in the soil Releases H as aluminosilicate + , lead to continuous acidification of the soil; the second is acid rain: the air pollution caused by the accelerated industrialization process has led to an increase in the frequency of acid rain; the third is the unreasonable f...

AI Technical Summary

Problems solved by technology

First, the natural acidification process is inevitable: due to the hot and humid climate conditions in the south, the weathering of soil silicate minerals and secondary minerals is rapid, and cations such as calcium and magnesium in the soil are lost, while aluminum hydroxide and silicon oxide colloids are accumulated in the soil Releases H as aluminosilicate + , lead to continuous acidification of the soil; the second is acid rain: the air pollution caused by the accelerated industrialization process has led to an increase in the frequency of acid rain; the third is the unreasonable fertilization of farmland: the chemical fertilizers currently promoted in my country are mainly acidic or physiologically acidic fertilizers. The proportion of organic fertilizers is constantly decreasing, which further exacerbates the problem of soil acidification

[0004] 2. Serious soil pollution problem

First, mining, dressing, metallurgy and other industrial and mining industries have led to an increase in the discharge of "three wastes", while heavy metal ores such as cadmium, lead, and arsenic in the non-ferrous metals in the southern region are relatively high, and industrial processes have caused serious pollutant emissions; the second is agricultural and animal husbandry waste The third is soil acidification and the promotion of high-yield varieties lead to intensified absorption and accumulation of crops

[0005] 3. Low fertilizer use efficiency and cause agricultural non-point source pollution

At present, there are serious unreasonable phenomena in farmland fertilization, including: heavy chemical fertilizers light organic fertilizers, heavy nitrogen fertilizers light phosphorus and potassium, heavy macroelements and light trace elements, mainly acidic or physiologically acidic and lack of alkaline fertilizers, and crops such as hi silicon ( Rice) soil silicon deficiency has not attracted enough attention

Unreasonable fertilization schemes also lead to serious loss of nitrogen and potassium in the form of runoff and ammonia volatilization, and phosphorus is fixed in the soil and becomes invalid

[0006] The above soil quality problems have seriously affected the sustainable use of soil, and brought hidden dangers to the planting of crops and subsequent food safety

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