Method for separating and extracting indium and gallium from indium-gallium solution
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A solution, indium and gallium technology, applied in the field of separation and extraction of indium and gallium, can solve the problems of low recovery rate of gallium, easy entrainment and co-precipitation, difficult control, etc., and achieve the effects of reduced production cost, high recovery rate and simple operation
Inactive Publication Date: 2015-09-23
孙刚
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[0003] The existing method of separating indium and gallium from the solution is mainly to extract indium with P204 extractant first, and then recover gallium from the raffinate, but when extracting indium, some gallium will be co-extracted into the organic phase, resulting in a low recovery rate of gallium
In addition, there are also literature reports to separate by hydrolysis and precipitation, but the hydrolysis pH values of the two are relatively close, the control is difficult, and it is easy to entrain and co-precipitate, resulting in impure product or low recovery rate
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Embodiment 1
[0024] (1) Using P204 as the extractant and sulfonated kerosene as the diluent, an extraction phase with a concentration of 30% was prepared.
[0025] (2) Take 200ml of an aqueous solution containing 460ppm indium and 356ppm gallium, and adjust the pH to 1.8 with sodium hydroxide solution.
[0026] (3) Add 100ml of the prepared extract phase into the solution in (2), and stir it with constant temperature at 30°C for 10 minutes.
[0027] (4) Pour the stirred two phases into a separatory funnel and let it stand for 3 minutes to separate the liquids. The upper layer is the indium-gallium-rich organic phase, and the lower layer is the raffinate.
[0028] (5) Take out the organic phase in (4), add 10mol / L hydrochloric acid for back extraction, and stir at a constant temperature of 30°C for 10min.
[0029] (6) Pour the stirred two phases into a separatory funnel and let it stand for 5 minutes. The upper layer is the gallium-rich organic phase, and the lower layer is the indium-rich...
Embodiment 2
[0035] (1) Using 1 volume of P204+0.2 volume of Cyanex272 as the extractant and sulfonated kerosene as the diluent, the extraction phase with a concentration of 25% was prepared.
[0036] (2) Take 200ml of an aqueous solution containing 150ppm indium and 210ppm gallium, and adjust the pH to 1.9 with sodium hydroxide.
[0037] (3) Add 100ml of the prepared extract phase into the solution in (2), and stir it with constant temperature at 30°C for 10min.
[0038] (4) Pour the stirred two phases into a separatory funnel and let it stand for 5 minutes to separate the liquid. The upper layer is the indium-gallium-rich organic phase, and the lower layer is the raffinate.
[0039] (5) Take out the organic phase in (4), add 10mol / L hydrochloric acid for back extraction, and stir at a constant temperature of 30°C for 10min.
[0040] (6) Pour the stirred two phases into a separatory funnel and let it stand for 5 minutes. The upper layer is the gallium-rich organic phase, and the lower la...
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Abstract
The invention relates to a method for separating and extracting indium and gallium from an indium-gallium solution. The method comprises the steps that (1) extraction is carried out, i.e., organic phosphoric acid is adopted as an extraction agent, and diluents are added, so that an organic phase is obtained, and the organic phase is added to liquid to be extracted for extraction after pH value is adjusted; (2) reverse extraction of indium is carried out, i.e., reverse extraction is conducted on the extracted phase in the step (1) with concentrated hydrochloric acid, so that an indium-enriched aqueous phase is obtained; (3) reverse extraction of gallium is carried out, i.e., reverse extraction is conducted on the organic phase subjected to reverse extraction in the step (2) with an oxalic acid solution, so that a gallium-enriched aqueous phase is obtained; (4) zinc or aluminum is added into the indium-enriched aqueous phase obtained in the step (2) to obtain indium through replacement, or alkaline substances are added to obtain indium hydroxide sediment; (5) precipitants are added into the gallium-enriched water phase obtained in the step (3) to obtain calcium oxalate, filtration is carried out to remove calcium oxalate, and replacement is carried out on liquid obtained after filtration with zinc or aluminum to obtain the simple substance gallium, or alkaline substances are added to obtain gallium hydroxide sediment. According to the method, two elements are recovered by conducting extraction once and reverse extraction twice, separation is complete, the recovery rate is high, operation is easy, and production cost is reduced.
Description
technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a method for separating and extracting indium and gallium from an indium gallium solution. Background technique [0002] Indium and gallium, as rare metal elements, are important industrial materials and are often used in alloys, sensors and semiconductors. Due to the scarcity of the two elements, recycling indium or gallium from some industrial waste or electronic waste has become an important way. Indium gallium often exists in some industrial wastes at the same time, such as smelting zinc slag, indium gallium alloy target waste and discarded indium gallium arsenic detectors. The separation of the two elements will inevitably be involved in the recycling process. However, the properties of indium and gallium are relatively similar in the ionic state of solution, and it is difficult to separate and extract, so it has become a common problem in the industry. [0003] The existing...
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