Method for recovering elemental magnesium and elemental calcium from magnesium sulfate solution

A magnesium sulfate and magnesium chloride solution technology, applied in chemical instruments and methods, magnesium carbonate, calcium/strontium/barium sulfate, etc., can solve the problems of resource waste, magnesium and calcium cannot be effectively used at the same time, etc.

CN107364879AActive Publication Date: 2017-11-21CHINA ENFI ENGINEERING CORPORATION

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Patent Information

Authority / Receiving Office: CN · China
Current Assignee / Owner: CHINA ENFI ENGINEERING CORPORATION
Publication Date: 2017-11-21

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Abstract

The invention provides a method for recovering elemental magnesium and elemental calcium from a magnesium sulfate solution. The method comprises the following steps: subjecting a magnesium sulfate solution and calcium chloride to a neutralization reaction so as to obtain a magnesium chloride solution and gypsum, wherein the magnesium sulfate solution contains calcium ions; subjecting the magnesium chloride solution and calcium hydrate to a metathesis reaction so as to obtain a calcium chloride solution and a crude magnesium hydroxide product; subjecting the crude magnesium hydroxide product and carbon dioxide to a carbonization reaction so as to obtain a magnesium bicarbonate solution; and subjecting the magnesium bicarbonate solution to a thermal decomposition reaction so as to obtain basic magnesium carbonate. The method provided by the invention can recover both elemental calcium and elemental magnesium in the magnesium sulfate solution, and the recovered elemental calcium and elemental magnesium are both high in purity.

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Description

technical field

[0001] The invention relates to the field of hydrometallurgy, in particular to a method for recovering magnesium element and calcium element from magnesium sulfate solution. Background technique

[0002] At present, in many industrial fields, a large amount of waste liquid containing magnesium is often produced. Likewise, acid leaching of magnesium-bearing ores in hydrometallurgical processes produces large quantities of solutions containing magnesium sulfate. Magnesium sulfate, also known as "bitter water", is a toxic substance that can cause diarrhea in humans. Therefore, the country prohibits the direct discharge of wastewater containing magnesium sulfate.

[0003] There are mainly two ways to treat wastewater containing magnesium sulfate: one is to make magnesium sulfate heptahydrate through evaporation and concentration, cooling and crystallization, which is the commonly used magnesium fertilizer in China; the other is to prepare magnesium hydroxide by ...

Claims

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