Process to produce magnesium compounds, and various by-products using sulfuric acid in a HCl recovery loop
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United States of America Patent
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Oct 30, 2018
Grant Date -
Dec 14, 2017
app pub date -
Nov 18, 2015
filing date -
Nov 18, 2014
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Abstract
The present description relates to a process for extracting magnesium compounds from magnesium-bearing ores comprising leaching serpentine tailing with dilute HCl to dissolve the magnesium and other elements like iron and nickel. The residual silica is removed and the rich solution is further neutralized to eliminate impurities and recover nickel. Magnesium chloride is transformed in magnesium sulfate and hydrochloric acid by reaction with sulfuric acid. The magnesium sulfate can be further decomposed in magnesium oxyde and sulphur dioxyde by calcination. The sulphur gas can further be converted into sulfuric acid.
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