Waste utilization based environment friendly phosphate fertilizer, preparation method and application thereof

Abstract

The invention discloses a waste utilization based environment friendly phosphate fertilizer, a preparation method and application thereof. The environment friendly phosphate fertilizer is prepared mainly by subjecting a liquid state active silicon rich substance and a phosphorus containing waste mineral to mixed culture, and activating the phosphorus containing waste mineral with the liquid state active silicon rich substance. The specific preparation method consists of: firstly grinding the phosphorus containing waste mineral to increase the specific surface area; fully mixing the phosphorus containing waste mineral with the liquid state active silicon rich substance; adding water into the mixture to start culture incubation; performing drying at the end of culture incubation; and subjecting the dried mixture to granulation, thus obtaining the environment friendly phosphate fertilizer. The environment friendly phosphate fertilizer prepared by the method provided by the invention can be applied as a crop composite phosphor-silicon fertilizer. The technical scheme involved in the invention can stimulate the activity of phosphorus, also can reduce the toxicity of heavy metals, ensures food safety and promotes the growth of crops.

Description

technical field [0001] The invention belongs to the technical field of fertilizer application, and in particular relates to an environment-friendly phosphate fertilizer and its preparation method and application. Background technique [0002] Phosphorus is an essential nutrient for plants and animals. Most of the world's phosphorus is consumed by food crops in the primary form of NPK fertilizers. Phosphate ore is the only important source of phosphorus in the world. With the continuous exploitation of phosphate ore resources, phosphate ore resources are becoming less and less. According to conservative estimates, global phosphate ore resources are only enough for 30-40 years of development, and optimistic estimates are not more than 100. Therefore, developing and utilizing phosphorus-containing slag resources, improving the phosphorus grade of phosphate mines, and improving the availability of phosphorus in plants are one of the methods to solve this major problem. [0003...

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Problems solved by technology

Now this method of using microorganisms to activate phosphorus in phosphate minerals is also very common. However, these methods will convert heavy metals in phosphate minerals into unstable forms, and there is a potential risk of heavy metal pollution.

It has also been reported that some minerals mixed with phosphate ore can increase the activity of phosphorus in phosphate ore. For example, the results of field experiments show that the application of silicon fertilizer has the possibility of increasing the phosphorus content available to plants. A.Hall et al. also proposed that after the application of silicon fertilizer There is a possibility of ion exchange between silicate ions and phosphate ions, but these reports are only general, especially in the selection of activating minerals and the activation mechanism, which needs further research, and the activation effect is not obvious enough.

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