Research status of technology for removing magnesium from residual acid after purification of wet-process phosphoric acid
With the expansion of production and capacity of purified wet-process phosphoric acid plant,the amount of by-product residual acid is also increasing year by year.However,the residual acid is difficult to efficiently utilize due to its complex composition and high content of sesquioxides,especially the magnesium ions limit its utilization direction.The composition of residual acid and the impact of magnesium ion on its utilization are analyzed.The application,advantages and disadvantages of chemical precipitation method,pH adjustment method and membrane separation purification method for magnesium removal are compared and analyzed,and rational suggestions are proposed for magnesium removal from residual acid.
purification of residual acidmagnesium removalcomparative analysissuggestion
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