Abstract
In this paper, carbon dioxide and polyacrylamide were used to improve the method to abstract magnesium from desalination brine. Experimental results showed that calcium ion in the desali-nation brine can be effectively removed using carbon dioxide, which thereby improves the purity and reaction efficiency of the magnesium hydrate precipitate. 0.1% - 0.2% PAM could help to promote the precipitation of magnesium hydrate colloid. And when hydroxyl anion was between 110% - 130% of theoretical amount, yield of magnesium hydrate exceeds 70% at standing time of 60 hours.
Highlights
Magnesium is an important industrial raw material, which can be used as a reductant to recover metals like titanium, zirconium, uranium and beryllium, and can be used to make fireworks, flash powder, fireproof materials, etc
Since most of elements contained in desalination brine are higher in concentration than those in normal seawater, obtaining equivalent amounts of chemical resources from desalination brine is easier than extracting from normal seawater
Carbon dioxide was allowed to preferentially react with calcium ion in the desalination brine, the prepared decalcified mother liquor containing low calcium ion was reacted with alkali to produce the desired product magnesium hydrate
Summary
Magnesium is an important industrial raw material, which can be used as a reductant to recover metals like titanium, zirconium, uranium and beryllium, and can be used to make fireworks, flash powder, fireproof materials, etc. With the rapid development of seawater desalination industry, extraction of magnesium from desalination brine has gained researchers' attention. (2016) Application of Carbon Dioxide and Polyacrylamide in Extracting Magnesium from Brine by Precipitation Method. Magnesium is extracted from brine mainly by precipitation method [1]. Alkali is added into the brine to produce magnesium hydroxide precipitate to separate magnesium from the brine through phase separation, which is the most rapid and effective method [2]. In this process, two core problems need to be addressed: one is the interference by calcium ions; and the other is the improvement of magnesium ion precipitation efficiency. The extents to which these two difficulties can be resolved are investigated through experiments using two chemicals, carbon dioxide (CO2) and polyacrylamide (PAM)
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