Method for preparing rod-like magnesium hydroxide from salt lake brine

Abstract

The invention discloses a method for preparing rod-like magnesium hydroxide from salt lake brine. The method comprises the following steps of: concentrating and crystallizing salt lake brine, from which elements such as potassium and lithium are extracted, serving as a raw material to obtain bischofite; dissolving the bischofite separated by crystallization into water to prepare magnesium chloride solution; introducing ammonia gas to perform magnesium precipitation reaction; when the pH value reaches 7-8, stopping introducing the ammonia gas, reacting at the temperature of 30-50 DEG C for 0.5-2 hours, aging and filtering to obtain alkaline magnesium chloride and magnesium precipitation mother liquor; dispersing the alkaline magnesium chloride in mixed solution of ethanol and water to obtain alkaline magnesium chloride suspension; adding sodium hydroxide to further precipitate to obtain rod-like magnesium hydroxide; filtering and separating to obtain magnesium precipitation mother liquor; replenishing the bischofite and circulating for precipitating the alkaline magnesium chloride; feeding to an ammonia still process along with concentration enrichment of magnesium precipitation mother liquor in ammonia chloride; performing ammonia still with lime; and circulating the produced ammonia gas to precipitate the alkaline magnesium chloride of a next batch and producing byproduct calcium chloride, wherein the magnesium content in the brine is not less than 93.4 g/L. The method has the advantages of high product purity, good economic benefit, no environmental pollution, high operability and easiness for industrial production.

Description

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AI Technical Summary

Benefits of technology

This new type of material called talc can be found naturally occurring or artificially produced on various types of rock surfaces such as limestone rocks during chemical processes like manufacturing ceramic products. It helps filter out unwanted substances while also acting as an effective agent for other purposes that may benefit the surrounding area's healthy flora.

Problems solved by technology

Technological Problem: Current technologies for producing magnetic iron sulfite (iron sesquioy) from salmonic acid include pyrochlore smellless crystal powder, sintered dolomites, and expensive chemicals like zinc hydride. Additionally, current techniques involve complex operations involving heat treatment at very specific temperatures and pressures, leading to increased costs associated with these treatments.

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