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Technology for recovering magnesium from magnesium sulfate solution

A magnesium sulfate solution technology, applied in the field of magnesium recovery, can solve the problems of energy consumption, high production costs, and environmental pollution again, and achieve the effect of reducing processing costs

Active 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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  • Technology for recovering magnesium from magnesium sulfate solution
  • Technology for recovering magnesium from magnesium sulfate solution
  • Technology for recovering magnesium from magnesium sulfate solution

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0052] Table 1 magnesium sulfate solution composition table (g / l)

[0053] Mg

SO 4 2-

Al

Ni

co

mn

Fe

26-40

103-160

0.023

0.004

0.0016

0.0024

0.002

[0054] Ammonia: 10-25% ammonia

[0055] Get the magnesium sulfate solution 500ml of table 1.

[0056] Ammonia is the theoretical amount

[0057] Reaction temperature: room temperature~60℃

[0058] Addition method: ammonia water is added to magnesium sulfate solution

[0059] Reaction time: 0.5 hours to 2 hours

[0060] Filtration time: 1 minute to 5 minutes

[0061] The yield of magnesium hydroxide is 35-50%

[0062] Magnesium hydroxide purity ≥ 98%

example 2

[0064] Get the magnesium sulfate solution 500ml of table 1

[0065] Ammonia is 1-2 times the theoretical amount

[0066] Reaction temperature: room temperature~60℃

[0067] Addition method: ammonia water is added to magnesium sulfate solution

[0068] The amount of magnesium hydroxide seed crystals added is 0.5 to 3 times the theoretical amount

[0069] Reaction time: 0.5 hours to 2 hours

[0070] Filtration time: 0.5 minutes to 5 minutes

[0071] Magnesium hydroxide yield: 40-60%

[0072] Magnesium hydroxide purity ≥ 99%

example 3

[0074] Take the filtrate and lotion of Example 1 ~ 500ml

[0075] Add pre-prepared gypsum seeds

[0076] The excess of 1.05 lime slurry is used at a concentration of 5% to 20% by weight.

[0077] Causticizing time: 1 hour to 2 hours

[0078] Causticizing temperature: 45℃~105℃

[0079] Pickling gypsum and magnesium hydroxide,

[0080] PH2~5.5 Filtration output gypsum purity ≥ 95%, Mg ≤ 0.5-1%

[0081] The output temperature is 75-85°C, the specific gravity is 1.37-1.38 magnesium sulfate dissolves

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Abstract

The invention relates to a technology for recovering magnesium from a magnesium sulfate solution, comprising the following steps of: (A) mixing the magnesium sulfate solution with ammonia water to obtain slurry containing a magnesium hydroxide sediment and residual magnesium sulfate; (B) filtering the slurry containing the magnesium hydroxide sediment and the residual magnesium sulfate to respectively obtain the magnesium hydroxide sediment and a filtrate; (C) causticizing the filtrate by using calcium hydroxide and / or calcium oxide to obtain slurry containing the magnesium hydroxide sediment and calcium sulfate and generate ammonia; (D) introducing carbon dioxide in the slurry containing the magnesium hydroxide sediment and the calcium sulfate so that magnesium hydroxide is carbonized to generate magnesium hydrogen carbonate and the calcium sulfate is separated; and (E) heating a magnesium hydrogen carbonate solution separated from the calcium sulfate so that the magnesium hydrogen carbonate is decomposed to generate a basic magnesium carbonate sediment and the carbon dioxide. The technology can be used for efficiently recovering the magnesium hydrogen carbonate and the basic magnesium carbonate from the magnesium sulfate solution.

Description

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

Claims

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Application Information

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IPC IPC(8): C22B26/22C01C1/02C01F5/24C01B31/20C01B32/50
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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