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Improved method for leaching magnesium-containing ore

A magnesium ore, leaching technology, applied in the direction of improving process efficiency, magnesium hydroxide, etc., can solve the problems of energy consumption, high equipment requirements, and environmental pollution again, and achieve the effect of reducing pollution and reducing costs

Inactive Publication Date: 2010-06-30
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 this process uses processes such as calcination, it has high requirements for equipment and high production costs.

Method used

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  • Improved method for leaching magnesium-containing ore
  • Improved method for leaching magnesium-containing ore
  • Improved method for leaching magnesium-containing ore

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049] Table 1: Composition table of magnesium sulfate solution obtained after sulfuric acid leaching solution of magnesium-containing ore is purified (g / l)

[0050] Mg

SO 4 2-

Al

Ni

co

mn

Fe

26

103

0.023

0.004

0.0016

0.0024

0.002

[0051] Get the magnesium sulfate solution 500ml of table 1

[0052] The magnesium sulfate solution is mixed with lime milk slurry with a concentration of 5% to 20 (weight percent), and the excess of lime milk is 1.05%

[0053] Precipitation time: 1 hour to 2 hours

[0054] Temperature: 35℃~55℃

[0055] Separation of gypsum and magnesium hydroxide

[0056] Output gypsum purity ≥ 95%, Mg ≤ 0.5-1%

[0057] Add additives to the magnesium hydroxide slurry and stir evenly

[0058] Stirring time: 0.5 hours to 1 hour

[0059] The magnesium hydroxide slurry is flocculated into a 20-45% non-settling magnesium hydroxide slurry.

example 2

[0061] Add the pre-prepared gypsum seeds while mixing the milk of lime with the magnesium sulfate solution;

[0062] Other steps are the same as Example 1.

example 3

[0064] Add pre-prepared magnesium hydroxide seeds while mixing milk of lime with magnesium sulfate solution;

[0065] Other steps are the same as Example 1.

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Abstract

The invention discloses a method for leaching magnesium-containing ore, which comprises the steps of: mixing magnesium-containing ore with vitriol solution to carry out acid leaching to obtain magnesium sulfate-containing lixivium; purifying the lixivium to obtain magnesium sulfate solution; mixing the magnesium sulfate solution with calcium hydroxide and / or calcium oxide to obtain serous fluid containing magnesium hydroxide and calcium sulfate; separating calcium from magnesium in the serous fluid to obtain the magnesium hydroxide serous fluid and the calcium sulfate; and adding additive into the magnesium hydroxide serous fluid to flocculate into non-deposited magnesium hydroxide. The technology can recover the magnesium with high efficiency and low cost from the purified magnesium sulfate solution, wherein the recovered magnesium can be used for desulphurization in electricity generating stations; recycles the magnesium in the magnesium sulfate solution; and saves the resources.

Description

technical field [0001] The invention relates to a hydrometallurgy process, in particular to a leaching process for magnesium-containing ores. Background technique [0002] Traditionally ore smelting is carried out by pyrometallurgy process. In recent years, hydrometallurgy technology has been developed. Because hydrometallurgy can effectively reduce environmental pollution and can be applied to many different mines, it is gradually replacing pyrometallurgy. [0003] The current hydrometallurgy process mostly adopts the sulfuric acid leaching process, which can leach various metal elements contained in the ore. If these metal elements cannot be recovered, it will be a great waste, and some components in the leachate may also cause harm to the human body. For example, when leaching magnesium-containing ores, a large amount of solution containing magnesium sulfate will be produced. Since magnesium sulfate is also called "bitter water", it is a toxic substance that can cause ...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B26/22C01F5/14
CPCY02P10/20
Inventor 刘金山孙宁磊王魁珽陆业大张文高保军
Owner CHINA ENFI ENGINEERING CORPORATION
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