Method for preparing multielement micropore mineral fertilizer from silicate rock through hydrothermal chemical reaction

Abstract

The invention provides a method for preparing multi-element microporous mineral fertilizer from silicate rocks through a hydrothermal chemical reaction. The method is characterized in that the hydrothermal chemical reaction is carried out in a semi-wet state after the silicate rocks and fine powder of an alkali soil excitant and an activator, thereby wholly converting minerals in the silicate rocks into effective forms which can be absorbed by plant with high efficiency (65 to 85 percent); and the fertilizer has unique microporous structures and becomes the multi-element microporous mineral fertilizer.

Description

technical field [0001] The invention belongs to the field of mineral fertilizer production, and in particular relates to a method for preparing multi-element microporous mineral fertilizer from silicate rock by hydrothermal chemical reaction in a semi-humid state. Background technique [0002] Plant growth requires not only nitrogen, phosphorus and potassium, but also medium elements such as silicon, calcium, magnesium, sulfur, and trace elements such as iron, manganese, boron, and rare earth, and each essential nutrient element has its special function and cannot be taken replaced by other elements. [0003] Various fertility factors in soil are not isolated, but interrelated and restrict each other. According to the law of minimum nutrient, the yield of crops mainly depends on the supply of the least amount of nutrients in the soil (similar to the barrel theory, the water storage capacity of the barrel depends on the height of the shortest plank), the shortage of potassiu...

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Problems solved by technology

[0004] But for a long time, the problem of unbalanced fertilization has been very prominent. Excessive application of nitrogen fertilizers has rarely supplemented mineral nutrients such as potassium, silicon, calcium, magnesium, iron and manganese. Long-term high yields have caused a large amount of potassium, silicon and other elements in the soil to be consumed. The coordinated balance of the diet is broken, and the comprehensive fertility continues to decline

[0005] The consequences of soil fertility imbalance are: 1) the actual utilization rate of nitrogen and phosphorus fertilizers is very low, and the nitrogen fertilizer is less than 30%, which not only limits the further increase of agricultural production, but also increases the cost of agricultural production, and also causes agricultural three-dimensional pollution; 2) Potassium silicon The shortage of quality elements such as calcium, magnesium and sulfur leads to nutritional imbalance, which not only makes plants prone to disease, but also reduces the quality of agricultural products, such as melons not fragrant and fruits not sweet; 3) Excessive application of nitrogen fertilizers causes soil acidification and secondary salinization on the one hand, Harmful organisms breed, and at the same time, it is easy to cause excessive nitrate residues in agricultural products

Moreover, the potassium-containing silicate rocks used in the prior art are mainly composed of K 2 Special rocks composed of authigenic silicate minerals with high O content, there is no method of using ordinary silicate rocks to produce mineral fertilizers

More importantly, so far, there is no one that can simulate the process of geochemical weathering into soil, convert various minerals in silicate rocks into effective nutrients for plant growth, and make it have unique micropores. structural technology

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