Magnesium-silicon hydrate binding agent based on salt lake brine and preparation method of magnesium-silicon hydrate binding agent

Abstract

The invention relates to a magnesium-silicon hydrate binding agent based on salt lake brine and a preparation method of the magnesium-silicon hydrate binding agent. The binding agent adopts a technical scheme as follows: firstly, a silicate solution in a molar concentration ratio of magnesium ion to silicon ion being (0.6-2.0):1 is added to the salt lake brine and stirred uniformly, and a mixed solution is obtained; then, the mixed solution is left to stand for 10-91 hours at 25-90 DEG C, washed and subjected to suction filtration, and a solid product and a filtrate are obtained respectively;next, the solid product is dried at 45-120 DEG C and ground, and the magnesium-silicon hydrate binding agent based on the salt lake brine is prepared. The filtrate is evaporated and crystallized, andone or two by-products of potassium chloride, sodium chloride and lithium carbonate is or are obtained. The method has the characteristics of being simple in process, high in yield, safe, environmentally friendly and short in period; the prepared magnesium-silicon hydrate binding agent based on the salt lake brine has high purity, excellent thermal stability and good use effect, and can be widelyused in the fields of magnesium refractory castables, environment-friendly concrete building materials and the like.

Description

technical field [0001] The invention belongs to the technical field of magnesium silicon hydrate binder. Specifically relates to a magnesium silicon hydrate binder based on salt lake brine and a preparation method thereof. Background technique [0002] my country's Qinghai Salt Lake is rich in potassium, sodium, magnesium, lithium and other resources. After the development of potassium salt resources in salt lakes, magnesium chloride, which is 10 times larger than potassium salts, was re-discharged into salt lakes, but it was not developed and utilized on a large scale. Instead, it caused the problem of "magnesium damage" in salt lakes. At present, the main way to utilize magnesium chloride resources in salt lakes is to produce metallic magnesium and magnesium oxide. Among them, the preparation process of metal magnesium will generate a large amount of chlorine gas, which will easily cause problems such as environmental pollution and equipment corrosion. The preparation...

AI Technical Summary

Problems solved by technology

The chemical synthesis method is based on the principle that two salt solutions react to form a precipitate to prepare magnesium silicon hydrate. High-purity magnesium silicon hydrate can be produced under normal temperature conditions, but this method will produce a large amount of filtrate during the filtration process. At present has not been properly dealt with