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Method for recovering rhodium from rhodium-containing waste liquid

A technology of waste liquid and concentrated liquid, which is applied in the field of rhodium recovery, can solve the problems of low loss of rhodium, large loss of rhodium, and high price of rhodium metal, and achieve the effects of reducing loss of rhodium, increasing incineration speed, and high degree of rhodium enrichment

Active Publication Date: 2020-04-17
山东博苑医药化学股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the incineration methods of the above rhodium-containing waste liquid all have the disadvantage of large loss of rhodium in the incineration process. Due to the high price of rhodium metal, the loss of rhodium caused by the incineration process needs to be minimized

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  • Method for recovering rhodium from rhodium-containing waste liquid
  • Method for recovering rhodium from rhodium-containing waste liquid
  • Method for recovering rhodium from rhodium-containing waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The method for reclaiming rhodium from rhodium-containing waste liquid comprises the following steps:

[0053] 1) Pour the rhodium-containing waste liquid into the concentration kettle to concentrate, and steam the light components; the concentration conditions are: vacuum degree 0.08MPa, concentration temperature 100°C, and the concentration end point is: the volume of the rhodium-containing waste liquid concentrate is 100°C. 20% of the total volume of waste liquid;

[0054] 2) Add wood chips to the rhodium-containing waste liquid concentrated solution obtained in step 1), the addition of wood chips is 10% of the quality of the rhodium-containing waste liquid concentrated liquid, after stirring evenly, put it into an incinerator for initial burning, the initial burning The temperature is 800°C, the incineration time is 8 hours, the incinerator is connected with a wet dust collector and a cyclone dust collector, the flue gas is collected through the wet dust collector a...

Embodiment 2

[0069] The method for reclaiming rhodium from rhodium-containing waste liquid comprises the following steps:

[0070] 1) Pour the rhodium-containing waste liquid into the concentration kettle to concentrate, and steam the light components; the concentration conditions are: vacuum degree 0.1MPa, concentration temperature 500°C, and the concentration end point is: the volume of the rhodium-containing waste liquid concentrate 30% of the total volume of waste liquid;

[0071] 2) add sawdust to the rhodium-containing waste liquid concentrate that step 1) obtains, the addition of sawdust is 100% of the quality of the rhodium-containing waste liquid concentrate, after stirring evenly, put into an incinerator and carry out initial incineration, the initial incineration The temperature is 1000°C, the incineration time is 12 hours, the incinerator is connected with a wet dust collector and a cyclone dust collector, the flue gas is collected through the wet dust collector and the cyclone...

Embodiment 3

[0086] The method for reclaiming rhodium from rhodium-containing waste liquid, comprises the following steps:

[0087] 1) pour the rhodium-containing waste liquid into the concentration kettle and concentrate, and steam out the light components; the concentration conditions are: vacuum tightness 0.1MPa, concentration temperature 300 ℃, and the concentration end point is: the volume of the rhodium-containing waste liquid concentrate is that the rhodium-containing waste liquid is concentrated. 25% of the total volume of waste liquid;

[0088] 2) in the rhodium-containing waste liquid concentrated solution obtained in step 1), add wood chips, the add-on of wood chips is 50% of the rhodium-containing waste liquid concentrated solution quality, after stirring, put into the incinerator and carry out initial incineration, the initial incineration of The temperature is 900°C, and the incineration time is 10h. The incinerator is connected to a wet dust collector and a cyclone dust coll...

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Abstract

The invention belongs to the field of rhodium recovery, and particularly discloses a method for recovering rhodium from rhodium-containing waste liquid. The method comprises the following steps of concentrating the rhodium-containing waste liquid to evaporate light components, mixing wood chips, carrying out primary incineration on the rhodium-containing waste liquid concentrated solution to obtain rhodium-containing carbon residues, and carrying out acid pickling and water washing; carrying out secondary incineration on the rhodium-containing carbon residues to obtain rhodium-containing ash residues, and carrying out acid pickling, water washing, alkali washing and water washing to completely remove acid-soluble and alkali-soluble impurities; in the primary incineration and secondary incineration processes, enabling flue gas to pass through a wet dust collector and a cyclone dust collector, collecting dust in the flue gas, avoiding direct emission of the flue gas to pollute the environment, and reducing rhodium loss in the incineration process; and combining the dust with incineration residues, reacting with alkali metal acid sulfate to generate soluble rhodium salt, and reactingthe soluble rhodium salt with active metal to obtain rhodium. According to the process, the rhodium loss in the incineration process can be reduced, the rhodium yield can be improved, impurities in the rhodium-containing ash residues can be removed, the rhodium enrichment degree is higher, and the recovery process is simplified.

Description

technical field [0001] The invention belongs to the field of rhodium recovery, in particular to a method for recovering rhodium from rhodium-containing waste liquid. Background technique [0002] The content of the precious metal rhodium in the earth's crust is only one part per billion, but its use value is very high. It is widely used in chemical industry, aerospace, electronic information and other manufacturing fields. Although the amount is small, it plays a very important role. Known as "industrial vitamins". Among them, rhodium catalysts have been widely used in petrochemical, pharmaceutical and chemical industries, fine chemicals, and pharmaceutical and chemical industries. Rhodium octanoate is an important rhodium homogeneous catalyst for cyclopropanation reactions, olefin hydroformylation reactions, and ring closures. It has remarkable catalytic activity and is widely used in basic chemical industry, pharmaceutical chemical industry and other fields. Like all cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/001C22B7/006C22B7/009C22B11/026C22B11/048Y02P10/20
Inventor 于国清孙万堂袁崇凯王玉凤周丽娜
Owner 山东博苑医药化学股份有限公司
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