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Method for recovering magnesium from magnesium sulfate solution

A technology of magnesium sulfate and solution, applied in the direction of calcium/strontium/barium sulfate, magnesium hydroxide, etc., can solve the problems of high production cost, high equipment requirements, energy consumption, etc., and achieve the effect of improving recovery rate and purity

Active Publication Date: 2010-06-09
CHINA ENFI ENGINEERING CORPORATION
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  • Abstract
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Problems solved by technology

[0005] Because this technology adopts the process route of evaporation-calcination, it consumes a lot of energy and causes re-pollution to the environment, and because the process uses methods such as calcination, it has high requirements for equipment and high production costs, which is not suitable for large-scale production. industrial application

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  • Method for recovering magnesium from magnesium sulfate solution
  • Method for recovering magnesium from magnesium sulfate solution
  • Method for recovering magnesium from magnesium sulfate solution

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Embodiment Construction

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, and the embodiments described below by referring to the accompanying drawings are exemplary, are only used to explain the present invention, and cannot be construed as explanations for the present invention. limit.

[0026] It should be noted that the term "calcium oxide and / or calcium hydroxide" used in the present invention means that calcium oxide (quicklime) or calcium hydroxide (slaked lime) can be used, or a mixture of the two can be added. In actual operation, quicklime (CaO) can be digested with water to obtain milk of lime, the main reaction is CaO+H 2 O=Ca(OH) 2 , milk of lime is used as a mixture of calcium oxide and calcium hydroxide.

[0027] figure 1 A flow chart of the method for recovering magnesium from magnesium sulfate solution according to the first embodiment of the present invention is shown. according to figure 1 As sh...

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Abstract

The invention provides a method for recovering magnesium from a magnesium sulfate solution, which comprises the following steps of: (A) mixing calcium oxide and / or calcium hydroxide with calcium sulphate which is used as seed crystal; (B) mixing the magnesium sulfate solution with the mixture of the calcium oxide and / or the calcium hydroxide and the calcium sulphate to generate calcium sulphate precipitation and magnesium hydroxide precipitation; and (C) separating the calcium sulphate and the magnesium hydroxide. By recovering the magnesium hydroxide from the magnesium sulfate solution, the invention can recover the magnesium from the magnesium sulfate solution in a low-cost and low-pollution mode so as to achieve resource recycle.

Description

technical field [0001] The invention relates to a method for recovering magnesium, in particular to a method for recovering magnesium from a 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 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 method is to heat and evaporate the solution containing magnesium sulfate to obtain magnesium sulfate crystals. However, the disadvantages of this treatment method are high cost, low efficiency, large energy consumption, and low purity of the obtained magnesium sulfate crystals. [0004] For example, Chines...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C01F5/22
Inventor 顾凌霄王魁珽刘金山
Owner CHINA ENFI ENGINEERING CORPORATION