Method for preparing biological compound fertilizer from low-grade rare earth ore through microbial decomposition

Abstract

The invention discloses a method for preparing biological compound fertilizer from low-grade rare earth ore through microbial decomposition. The method comprises the following steps of: collecting soil samples from an rare earth ore area, and screening target microorganisms, which are capable of decomposing slightly soluble compounds containing potassium, phosphorus, sulfur and other elements from the rare earth ore, from the soil samples; mixing the multiple target microorganisms, and inoculating the target microorganism mixture to a solid medium containing rare earth ore powder for fermentation; and after the fermentation, adding sterile water to the solid medium in a bioleaching device to obtain a leaching agent containing soluble potassium, phosphorus, sulfur and other trace elements; and concentrating the leaching agent to obtain liquid biological compound fertilizer, and drying and granulating the solid medium in the leaching device to obtain solid biological compound fertilizer. The method has the advantages of small pollution and low energy consumption; and as the waste low-grade ore is taken as a raw material, the production cost is reduced, and environmental pollution caused by the waste ore is eliminated.

Description

technical field [0001] The invention relates to a production method of a biological compound fertilizer, in particular to a method for producing a biological compound fertilizer by using microorganisms to decompose low-grade rare earth ores. Background technique [0002] my country is a big agricultural country with a large demand for fertilizers. However, at present, there are not many ores that can be used to produce fertilizers in my country, especially soluble potassium, sulfur, and phosphate rocks. This is not conducive to the fertilizer production in our country. Therefore, my country needs to import a large amount of fertilizers from abroad every year. In 2012 alone, my country's potassium fertilizer imports reached 6.34 million tons. Foreign potassium fertilizer production enterprises implement price monopoly, which not only increases the cost of agricultural production, but also has a certain impact on the safety of grain production in my country. Therefore, ther...

AI Technical Summary

Problems solved by technology

However, most of the bio-fertilizers on the market only contain a single mineral element, such as the invention patent with the application number 00123208.8 and the publication number CN101229984A, which only use microorganisms to produce potassium fertilizers. The fertilizer contains a single element necessary for plants, which cannot meet the needs of plant production. Multiple macronutrient and micronutrient requirements

In this way, when applying such fertilizers, it is often necessary to apply other inorganic fertilizers to supplement other mineral elements, or to add other biologically required elements in the fertilizer production process, which undoubtedly increases the amount of labor and production costs in production.