Water-soluble fertilizer for soil improvement and preparation method thereof

Abstract

The invention relates to the technical field of chemical engineering, in particular to a water-soluble fertilizer for soil improvement and a preparation method thereof. Montmorillonite is used for preparing sodium polyacrylate after being subjected to modification treatment and is mixed with urea, potassium sulfate, urea phosphate, sodium salicylate, trace element compounds and medium element compounds in reasonable proportion to prepare the water-soluble fertilizer. The water-soluble fertilizer is remarkable in effect after being applied to crops, meanwhile heavy metals coagulate in soil, and accordingly the heavy metal absorption rate of the crops is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a water-soluble fertilizer with soil improvement function and a preparation method thereof. Background technique [0002] my country's soil heavy metal pollution is serious. In recent years, my country's soil heavy metal incidents have occurred frequently, which not only poses a threat to the quality of the foundation and farm products, but also directly damages the health of the people. The main reasons are mineral mining, metal smelting, chemical industry, coal combustion, Vehicle exhaust emissions, sludge use, sewage irrigation, pesticide and fertilizer application, etc., make common elements such as Cd, As, Pb, Zn, Cu, Cr, Hg in the soil exceed the standard, resulting in a decline in crop yield and quality, and even It causes groundwater pollution and accumulates in plants, animals and humans through the food chain. Therefore, the prevention, control and restoration o...

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Problems solved by technology

[0003] At present, the traditional remediation methods for soil heavy metal pollution are physical or chemical methods, such as soil replacement, soil dilution, leaching, electrochemistry, ion precipitation and other methods. The remediation principle is to reduce the concentration of heavy metals on the soil surface or increase the stability of heavy metal ions , reduce mobility, diffusion and bioavailability, thereby reducing its uptake by plants. The disadvantage of these methods is that they are not widely used and can only be used on a small scale. The cost and engineering volume of soil replacement are large and difficult to achieve. Washing needs to add chemical solvents, and the cost is very high. For example, the way of ion precipitation is only a temporary solution, not the root cause. Heavy metal ions are only temporarily fixed and cannot be removed. The possibility of re-contamination is very high. Plants absorb, transport and accumulate to remove harmful heavy metals in soil or water. The general phytoremediation technology refers to plant extraction technology, which uses high-biomass plants to transfer heavy metals from the soil and enrich them in the aerial parts of plants. This method has wide applicability, low cost, and is environmentally friendly. However, the current method also has defects, mainly in the few types of hyperaccumulative plants, small biomass, slow growth, The cycle is long, and the degree of soil pollution has a certain inhibitory effect on plant growth, which leads to unsatisfactory repair effects; the existing technology uses silicon fertilizers to improve the resistance of plants to heavy metal poisoning such as manganese, cadmium, aluminum, and aluminum. Reduce the absorption and accumulation of these heavy metals by crops, but due to the poor solubility of silicon fertilizers, they are easily absorbed by soil colloids, resulting in reduced effects and easy to cause secondary pollution

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