Method for recycling indium from germanium distillation waste acid
A waste acid and sulfuric acid technology, applied in the field of indium recovery, can solve the problems affecting the quality of crude indium, the influence of chloride root extraction, and the unfavorable extraction process, etc., to achieve the effects of ensuring normal operation, reducing production costs, and obvious cleaning characteristics
Active Publication Date: 2012-09-26
YANGZHOU NINGDA NOBLE METAL CO LTD
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Problems solved by technology
This process is a common indium recovery process, but it has the following disadvantages when it is applied to the recovery of indium from waste acid distillation: (1) the alkali consumption of neutralizing waste acid is large; (2) the sulfuric acid leaching requires high acidity and high temperature. In the process of acid leaching, the insoluble impurities such as lead and other sulfuric acid can only be simply separated, and most of tin, antimony, bismuth, zinc, magnesium, aluminum, silicon, etc. enter the leaching solution. (3) Due to the influence of impurities such as tin, antimony, silicon, etc., the extraction process is prone to third phase, emulsification, etc., which has a serious impact on the extraction; (4) Due to the high chlorine content of the indium-containing slag, the The extraction under the condition of conversion to sulfuric acid system often leads to high residual indium in the raffinate; (5) the extraction agent needs to be regenerated frequently; (6) the concentration of impurities in the indium stripping solution is high, which directly affects the quality of crude indium
Some data show that the recovery rate of indium in this process is high, but the process has not yet been industrialized, and the main disadvantages are as follows: (1) the acid waste gas in the distillation waste acid has an adverse effect on the extraction equipment and the site environment; (2) the distillation waste acid Medium organic matter and silicic acid colloid have adverse effects on the extraction process
[0005] As far as the characteristics of germanium distillation waste acid are concerned, if the traditional sulfuric acid system extraction process is used to recover indium, the following problems need to be solved: (1) high acidity leads to high neutralization costs; (2) tin and arsenic in distillation waste acid , antimony, bismuth, lead, zinc, magnesium, aluminum, silicon, organic matter and other impurities on the extraction of indium; (3) the impact of chlorine on the extraction of the conversion from hydrochloric acid system to sulfuric acid system; (4) hydrochloric acid Environmental pollution problems caused by volatility
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[0030] like figure 1 As shown, the present invention mainly includes the steps of concentration, alkalization, washing, sulfuric acid leaching, indium extraction, aluminum plate replacement, and melting and casting.
[0031] Specific steps are as follows:
[0032] 1. Concentration:
[0033] Put the distillation waste acid into a closed concentration tank, continue to heat and concentrate the distillation waste acid with steam, and at the same time pass compressed air to increase the volatilization speed, the acid gas is introduced into the hydrochloric acid absorption device, and about 30% hydrochloric acid is obtained after gas-water separation. Distillation system reused. After concentration, the volume of the concentrated bottom solution is reduced to 20% of the original, the acidity of hydrochloric acid is reduced from 6 to 8 mol / l to below 1 mol / l, the concentration of indium is increased by 5 times, and indium is not lost during the concentration process. After the ac...
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Abstract
A method for recovering indium from germanium distilled acid relates to a method for recovering indium from germanium distilled acid, belonging to the technical field of chemical metallurgy, which comprises the processes of concentration, basification, washing, sulfuric acid leaching, indium extraction, aluminum sheet replacement, fusion casting, etc. The method for recovering indium from germanium distilled acid by the process of concentration-basification-extraction has the advantages of strong applicability, high comprehensive recovery rate of indium, secondary pollution avoidance, etc.
Description
technical field [0001] The invention relates to a method for recovering indium from germanium distillation waste acid, which belongs to the technical field of metallurgy and chemical industry. Background technique [0002] Distillation waste acid is the residual acid in the germanium distillation process. Because germanium concentrate or germanium-enriched dust contains a certain amount of indium besides germanium, most of indium is dissolved in the process of distilling germanium with hydrochloric acid system and finally enters the distillation waste. Acid has a certain recovery value. The composition of distillation waste acid is complex, which is reflected in the high acidity, generally containing 6-8mol / l of acid, and containing various impurities such as tin, antimony, bismuth, lead, zinc, magnesium, aluminum, silicon, etc., which makes the recovery of indium a relatively large technology Difficult and uneconomical. Indium recovery technologies that have been reported...
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IPC IPC(8): C22B58/00C22B3/08
CPCY02P10/20
Inventor 樊红杰
Owner YANGZHOU NINGDA NOBLE METAL CO LTD