Preparation method of incomplete dehydrated magnesium chloride snow-melting agent

Abstract

The invention belongs to the technical field of comprehensive utilization of salt lake resources and particularly relates to a preparation method of an incomplete dehydrated magnesium chloride snow-melting agent. The preparation method comprises the following step: performing one-section dehydration on a byproduct bischofite of a salt lake in fluidization equipment at the temperature of 50-70 DEG C, so as to obtain a first incomplete dehydrated magnesium chloride snow-melting agent, wherein incomplete dehydrated magnesium chloride in the first incomplete dehydrated magnesium chloride snow-melting agent contains 4-6 crystal water molecules. According to the preparation method of the incomplete dehydrated magnesium chloride snow-melting agent, one-section dehydration is performed by utilizing the byproduct bischofite under strict temperature control to obtain the first incomplete dehydrated magnesium chloride snow-melting agent, so that a solving way of comprehensively utilizing the resources and turning waste into wealth is provided, the pollution to the ecological environment of the salt lake is reduced, and the sustainable development of the salt lake potash fertilizer industry is promoted; and besides, the preparation method provided by the invention also has the advantages of being low in preparation cost, simple in processes, good in snow-melting effect and the like.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of salt lake resources, and in particular relates to a preparation method of an incompletely dehydrated magnesium chloride deicing agent. Background technique [0002] Potassium fertilizer is widely used in agriculture as an important chemical fertilizer, but my country is a potassium-deficient country. More than 90% of the potassium fertilizer production in my country is produced in the Chaerhan Salt Lake area of ​​Qinghai. During the process of extracting potassium from the salt lake, there will be A large number of old brines, these old brines can be easily obtained bischofite with a purity of up to 98% through natural evaporation in salt pans, and ten tons of bischofite can be produced as a by-product for every ton of potash fertilizer produced. Bischoferte contains six crystal waters, and the quality of crystal water is about 53% of the total mass, which makes the transportat...

AI Technical Summary

Problems solved by technology

Bischoferte contains six crystal waters, and the quality of crystal water is about 53% of the total mass, which makes the transportation cost of bischomite expensive; at the same time, if it is not airtightly packaged, it will absorb water in humid air Therefore, a large amount of bicholorite piled up in the salt lake area not only pollutes the ecological environment of the salt lake, but also restricts the sustainable development of the potash fertilizer industry in the salt lake

[0003] Existing deicing agents are generally calcium chloride deicing agents and organic and inorganic composite deicing agents, but calcium chloride deicing agents have the problems of high cost, complicated preparation process, and unsatisfactory snow melting effect, while organic and inorganic deicing agents Composite deicing agent also has the problem of high cost