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Recovery of Pure Magnesium Oxide from Brine Sources

Bahadori, Babak | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45179 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Askari, Masoud; Nosheh, Mohammad
  7. Abstract:
  8. Today a significant portion of the world magnesia supply is produced by approximately 20 manufacturers by precipitation of magnesium hydroxide either from seawater or brine sources, which amounts to about 14% of the world magnesia production. The first synthetic magnesia production occurred along the French coast of the Mediterranean Sea, near Aiques-Mortes, operating sometime before 1885. Magnesium hydroxide was precipitated from seawater by reacting it with milk of lime in a continuous fashion using three sequential agitated reactors. Because of the abundance of brine resources enrich in Magnesium in our country, in this project, was tried to precipitate Magnesium Hydroxide from brine resources with a basic solution. A kind of Brine, salt sea water, and bittern were used for this purpose. Magnesium Hydroxide precipitation with four kind of basic solution Potassium Hydroxide, Dolomite, Sodium Hydroxide, and ammonia was investigated. Precipitation of Magnesium Hydroxide with Dolomite resulted in coarser grain precipitate and higher settling velocity and filtration rate. Precipitation with various basic solutions resulted in precipitates with multiple morphologies. The purpose of this project is extracting pure Magnesium Oxide from bittern and other brine resources. For this aim, different steps like refining brine includes removal of carbonates, sulfates, and boron were examined and the results shows that impurities like carbonates, sulfates, and boron were removed completely. Preparing appropriate basic solution for precipitating Magnesium Hydroxide from brine with investigating effectual parameters on calcination and hydration of dolomite were performed and the results show complete calcination and hydration of dolomite. The effects of different parameters like bittern concentration, dolomite purity, and dolomite quantity were investigated on the purity of final Magnesium Oxide. The results show with diluting the bittern, using pure dolomite minerals, and using under stoichiometric quantity of dolomite, 95% Magnesium Oxide was produced. Using KHOR-BIYABANAK brine and GHOM salt lake sea water and applying same conditions resulted in high purity Magnesium Oxide too
  9. Keywords:
  10. Brine ; Dolomite ; Precipitation ; Bases ; Bittern ; Boron Remowal ; Magnesium Oxide

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