Preparation method and application of potassium-magnesium fertilizer

Abstract

The invention belongs to the technical field of agricultural fertilizers, and particularly relates to a preparation method for a potassium-magnesium fertilizer. The preparation method comprises the following steps: removing sodium chloride from carnallite through evaporation and crystallization, and obtaining the potassium-magnesium fertilizer with the carnallite mass percentage not less than 95 percent. The invention also provides application of the potassium-magnesium fertilizer obtained with the preparation method. According to the potassium-magnesium fertilizer provided by the invention, on one hand, new application of the carnallite is provided, and a specific treatment way of the conventional conventional is changed, so that an old brine treatment problem produced by producing the fertilizer, such as potassium chloride and potassium sulphate, by utilizing the carnallite in the prior art is avoided; on the other hand, an obvious yield increasing effect can be achieved on crops bydirectly applying the potassium-magnesium fertilizer, and the potassium-magnesium fertilizer also has the characteristics of improving soil, resisting diseases and insect pests, preserving moisture and resisting drought, does not contain harmful substances, does not pollute environment, is an ideal potassium resource, and is particularly suitable for being prepared and applied in southeast Asia, thereby providing a new feasible way for utilizing carnallite resource of every country in the southeast Asia.

Description

technical field [0001] The invention belongs to the technical field of agricultural fertilizers, in particular, it relates to a preparation method of potassium magnesium fertilizer and its application. Background technique [0002] Potassium fertilizer is an essential and important fertilizer for agricultural crops. At present, most of the potassium fertilizers used are potassium chloride and potassium sulfate, which are mainly produced by flotation. The mature processes for producing potassium chloride mainly include cold decomposition-flotation method, reverse flotation-cold crystallization method, halogenation method, hot-melt crystallization method, cooling dissolution crystallization method, reaction extraction crystallization method, coupled crystallization method, etc. Potassium sulfate is mostly converted by potassium chloride except for sulfate-type salt lakes. [0003] For countries such as Laos and Thailand, a large amount of old brine containing magnesium chlori...

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Problems solved by technology

[0003] For countries such as Laos and Thailand, a large amount of old brine containing magnesium chloride will be produced in the process of using carnallite ore to produce potash fertilizers. The old brine will not only pollute the environment, but the cost of its treatment process is high, which restricts and affects the utilization of carnallite. Development of Potash Fertilizer Enterprises and Comprehensive Utilization of Carnallite Ore

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