Technology for recovering magnesium from magnesium sulfate solution
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A magnesium sulfate solution technology, applied in the field of magnesium recovery, can solve the problems of energy consumption, high production costs, and environmental pollution again, and achieve the effect of reducing processing costs
Active Publication Date: 2010-06-30
CHINA ENFI ENGINEERING CORPORATION
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[0005] Because this technology adopts the process route of evaporation-calcination, it consumes a lot of energy and causes re-pollution to th
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[0081] The output temperature is 75-85°C, the specific gravity is 1.37-1.38 magnesium sulfate dissolves
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Abstract
The invention relates to a technology for recovering magnesium from a magnesium sulfate solution, comprising the following steps of: (A) mixing the magnesium sulfate solution with ammonia water to obtain slurry containing a magnesium hydroxide sediment and residual magnesium sulfate; (B) filtering the slurry containing the magnesium hydroxide sediment and the residual magnesium sulfate to respectively obtain the magnesium hydroxide sediment and a filtrate; (C) causticizing the filtrate by using calcium hydroxide and/or calcium oxide to obtain slurry containing the magnesium hydroxide sediment and calcium sulfate and generate ammonia; (D) introducing carbon dioxide in the slurry containing the magnesium hydroxide sediment and the calcium sulfate so that magnesium hydroxide is carbonized to generate magnesium hydrogen carbonate and the calcium sulfate is separated; and (E) heating a magnesium hydrogen carbonate solution separated from the calcium sulfate so that the magnesium hydrogen carbonate is decomposed to generate a basic magnesium carbonate sediment and the carbon dioxide. The technology can be used for efficiently recovering the magnesium hydrogen carbonate and the basic magnesium carbonate from the magnesium sulfate solution.
Description
technical field [0001] The invention relates to a process for recovering magnesium, in particular to a process for recovering magnesium from magnesium sulfate solution. Background technique [0002] At present, in many industrial fields, a large amount of waste liquid containing magnesium is often produced. For example, acid leaching of magnesium-bearing ores in hydrometallurgical processes produces large quantities of solutions containing magnesium sulfate. Since magnesium sulfate, also known as "bitter water", is a toxic substance that can cause diarrhea in humans, the country prohibits the direct discharge of wastewater containing magnesium sulfate. [0003] The traditional treatment process is to heat and evaporate the solution containing magnesium sulfate to obtain magnesium sulfate crystals. However, the disadvantages of this treatment process are high cost, low efficiency, large energy consumption, and low purity of the obtained magnesium sulfate crystals. [0004]...
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Application Information
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