A method for separating indium and cadmium from indium and cadmium waste liquid

A technology for waste liquid, indium and cadmium, which is applied in the field of separation of indium and cadmium, can solve the problems of difficult solid-liquid separation, viscosity, poor operating conditions, etc., and achieves the effects of improving the type of sediment slag, improving the operating environment and easy operation.

Active Publication Date: 2016-09-28
西安诺博尔稀贵金属材料股份有限公司
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  • Description
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AI Technical Summary

Problems solved by technology

The traditional precipitation method uses ammonia water as a precipitant to separate indium and cadmium. However, ammonia water releases a large amount of pungent gas during the reaction process, and the operating conditions are harsh. Moreover, the precipitate formed by using ammonia water as a precipitant is paste-like, viscous, and it is difficult to achieve solid-liquid separate

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  • A method for separating indium and cadmium from indium and cadmium waste liquid
  • A method for separating indium and cadmium from indium and cadmium waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1. Add 900 g of oxalic acid to 60 L of indium-cadmium waste liquid containing 7.5 g / L of indium and 2.5 g / L of cadmium, stir and react at room temperature with white precipitates, and continue stirring until the precipitates no longer increase;

[0021] Step 2, adding ammonia water to the indium cadmium waste liquid after the reaction in step 1 until the pH value of the indium cadmium waste liquid is 9, and standing and aging at room temperature for 12 hours;

[0022] Step 3, adopt the suction filtration method to carry out solid-liquid separation to the indium cadmium waste liquid after static aging in step 2, obtain filter cake and about 64L filtrate, filter cake weighs about 1.3kg after drying, to the dried The filter cake was analyzed and detected. The mass percentage of indium in the dried filter cake was 53.01%, and the mass percentage of cadmium was 0.96%. The filtrate was analyzed and detected, and the filtrate contained 1.2 mg / L of indium. Contains cadmium...

Embodiment 2

[0027] Step 1. Add 1200g of oxalic acid to 60L of indium-cadmium waste liquid containing 10g / L of indium and 3.4g / L of cadmium, stir and react at room temperature with white precipitates, and continue stirring until the precipitates no longer increase;

[0028] Step 2, adding ammonia water to the indium-cadmium waste liquid after the reaction in step 1 until the pH value of the indium-cadmium waste liquid is 9, and standing and aging at room temperature for 24 hours;

[0029] Step 3, adopt the suction filtration method to carry out solid-liquid separation to the indium cadmium waste liquid after static aging in step 2, obtain filter cake and about 65L filtrate, filter cake weighs about 1.5kg after drying, to the dried The filter cake was analyzed and detected. The mass percentage of indium in the dried filter cake was 68%, and the mass percentage of cadmium was 2.11%. The filtrate was analyzed and detected, and the filtrate contained 24mg / L of indium, containing Cadmium 3.0g / L...

Embodiment 3

[0034] Step 1. Add 1000 g of oxalic acid to 100 L of indium-cadmium waste liquid containing 5 g / L of indium and 1.7 g / L of cadmium. Stir and react at room temperature to form a white precipitate. Continue stirring until the precipitate does not increase;

[0035] Step 2, adding ammonia water to the indium cadmium waste liquid after the reaction in step 1 until the pH value of the indium cadmium waste liquid is 9, and standing and aging at room temperature for 15 hours;

[0036] Step 3, adopt the suction filtration method to carry out solid-liquid separation to the indium cadmium waste liquid after static aging in step 2, obtain filter cake and about 109L filtrate, filter cake weighs about 1.3kg after drying, to the dried The filter cake was analyzed and detected. The mass percentage of indium in the dried filter cake was 35%, and the mass percentage of cadmium was 1.46%. The filtrate was analyzed and detected, and the filtrate contained 1.7mg / L of indium. Contains cadmium 1.5g...

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Abstract

The invention discloses a method for separating indium and cadmium from an indium / cadmium waste liquid, which comprises the following steps: 1. adding oxalic acid into the indium / cadmium waste liquid, and stirring to react until the precipitate no longer increases, wherein the oxalic acid is 1-4 times by mass of the indium in the indium / cadmium waste liquid; 2. adding ammonia water into the reacted indium / cadmium waste liquid until the pH value of the indium / cadmium waste liquid is 8-10, and aging for 12-24 hours by standing; and 3. carrying out solid-liquid separation on the aged indium / cadmium waste liquid to separate the indium and cadmium. The method is simple to operate and easy to implement; by using the oxalic acid and ammonia water as the coprecipitating agent, the indium in the indium / cadmium waste liquid can be precipitated more thoroughly, the precipitate slag form is improved, the filtration can be performed easily, and the solid-liquid separation can be performed more completely, thereby achieving the goal of separating the indium and cadmium and greatly lowering the consumption of the ammonia water. The operating environment is improved, thereby reducing the invasion of harmful gas onto the good health of the operating personnel.

Description

technical field [0001] The invention belongs to the technical field of separation and recovery of indium and cadmium, and in particular relates to a method for separating indium and cadmium from indium and cadmium waste liquid. Background technique [0002] Indium has excellent physical, chemical, mechanical and technological properties, and has been widely used in military, aerospace, industry, medicine and health. Indium resources are in short supply and facing depletion, and the price of indium is rising year by year. Therefore, it is imminent to research and develop the recovery of indium from industrial waste and improve the existing production process to increase the recovery rate of indium. For indium resources from different sources, the separation and recovery methods are also different. The recovery of indium in the leaching liquid is mainly divided into solvent extraction separation, ion exchange separation, liquid membrane extraction separation and neutralizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B17/00C22B58/00
CPCY02P10/20
Inventor 张骥薛晶晶贺慧陈昊韩吉庆沈大吉孙海霞马鑫邢健周龙海史智峰董蔚蔡兴顺邹辉吕棋苟攀龙李小刚
Owner 西安诺博尔稀贵金属材料股份有限公司
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