Preparation method of multielement biological phosphorus-potassium fertilizer

Abstract

The invention provides a preparation method of a multielement biological phosphorus-potassium fertilizer. The preparation method comprises the steps of: carrying out mixing, fermenting and low-temperature drying technologies on low and medium grade phosphate rock powder treated by super-fine grinding, low and medium grade potassium-containing rock powder treated by super-fine grinding, organic matter, a compound bacteria preparation and a proper amount of molasses or water to obtain mineral biological phosphorus-potassium fertilizer which is rich in phosphorus and potassium; and then carrying out mixing, pelleting, low-temperature drying and the like on the mineral biological phosphorus-potassium fertilizer and a compound mixed inorganic fertilizer to obtain the multielement biological phosphorus-potassium fertilizer. The multielement biological phosphorus-potassium fertilizer not only improves the conversion rates of low and medium grade phosphate rock and potassium-containing rock, but also has the advantages of organic phosphorus-potassium fertilizer and inorganic phosphorus-potassium fertilizer and overcomes the defects of the organic phosphorus-potassium fertilizer and the inorganic phosphorus-potassium fertilizer at the same time. The preparation method is short in process flow, simple in technology, free from pollution, low in cost, good in fertilizer efficiency and stable in fertilizer efficiency.

Description

technical field [0001] The invention belongs to the field of biochemical fertilizers. Specifically relates to a preparation method of multivariate biological phosphorus and potassium fertilizer. Background technique [0002] Nitrogen, phosphorus, and potassium are the three major elements necessary for crop growth and development, and phosphorus and potassium fertilizers are important material guarantees for high-yield and bumper crops. [0003] my country's phosphate rock resources are very rich, but mainly low-grade and medium-grade, few rich ore, the average grade is only 17%, and the ore dressing is difficult. In recent years, due to the increase in the output of high-concentration phosphate compound fertilizers, phosphate rock resources with a content of 30% have become increasingly scarce. The country has listed phosphate rock as one of the 20 minerals that cannot meet the requirements of China's national economic development after 2010. However, the medium and low-g...

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Problems solved by technology

[0005] At present, in terms of resource utilization of medium and low-grade phosphate rock and insoluble potash ore, the domestic mainstream methods are to use acid method and thermal method. These methods are prepared by chemical processes, and the cost is high. Hazards such as dust and poison, and easy to cause environmental pollution