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A magnesium ore and leaching technology, applied in the field of hydrometallurgy, can solve the problems of energy consumption, environmental pollution again, high equipment requirements, etc., and achieve the effect of reducing processing costs
Inactive Publication Date: 2010-06-30
CHINA ENFI ENGINEERING CORPORATION
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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
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example 1
[0061] Table 1 contains magnesium sulfate leaching solution composition list (g / L), wherein the magnesium sulfate solution is obtained after the sulfuric acid leaching solution containing magnesium ore is purified.
[0062] Mg
SO 4 2-
Al
Ni
co
mn
Fe
26-40
103～158
0.023
0.004
0.0016
0.0024
0.002
[0063] Ammonia water: 10-25% concentration ammonia water
[0064] Get the leaching solution 500mL containing magnesium sulfate of table 1
[0065] NH 4 HCO 3 1.0 to 1.2 times the theoretical amount
[0066] How to join: NH 4 HCO 3 The aqueous solution is added to the leaching solution containing magnesium sulfate
[0067] Reaction temperature: 50~40℃
[0068] Reaction time: 0.5 hours
[0069] Pyrolysis temperature: 60℃~95℃
[0070] Pyrolysis time: 0.5 hours
[0071] Yield based on Mg: 70-75%
[0072] Product purity: ≥98%
example 2
[0074] Get the leaching solution 500mL containing magnesium sulfate of table 1
[0075] solid NH 4 HCO 3 1.0 to 1.2 times the theoretical amount
[0076] Addition method: solid NH 4 HCO 3 The aqueous solution is added to the leach solution containing magnesium sulfate
[0077] Reaction temperature: room temperature
[0078] Reaction time: 0.5 hours
[0079] Pyrolysis temperature: 60℃~95℃
[0080] Pyrolysis time: 0.5 hours
[0081] Filtration time: 0.5 minutes to 5 minutes
[0082] Yield based on Mg: 70-75%
[0083] Product purity: ≥98%
example 3
[0085] Get the leaching solution 500mL containing magnesium sulfate of table 1
[0086] NH 4 HCO 3 1.1 times the theoretical amount
[0087] Ammonia water: 25% ammonia water 5mL
[0088] How to join: NH 4 HCO 3 And ammonia water is added to the leaching solution containing magnesium sulfate
[0089] Reaction time: 0.5 hours
[0090] Pyrolysis temperature: 60℃~95℃
[0091] Pyrolysis time: 0.5 hours
[0092] Yield based on Mg: 80-85%
[0093] Product purity: ≥98%
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Abstract
The invention provides a leaching method of a magnesium-containing ore. The method comprises the following steps: mixing the magnesium-containing ore with sulfuric acid solution and performing acid leaching to obtain leaching solution containing magnesium sulfate; purifying the leaching solution to obtain magnesium sulfate solution; mixing the magnesium sulfate solution with ammonium bicarbonate to obtain solution which contains magnesium hydrogen carbonate and residual magnesium sulfate; heating the solution and disintegrating the magnesium hydrogen carbonate to produce basic magnesium carbonate precipitation and carbon dioxide; and heating serous fluid which contains the basic magnesium carbonate precipitation and then performing filtering separation on the serous fluid to obtain the basic magnesium carbonate precipitation and filter liquor. By utilizing the leaching method of the magnesium-containing ore of the invention, not only the metal in the ore can be recovered, but also the magnesium in the ore can be efficiently recovered and the pollution is reduced.
Description
technical field [0001] The invention relates to a hydrometallurgy process, in particular to a leaching method of magnesium-containing ore. 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 method, 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 diar...
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