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Method for recovering rhodium from production waste liquid of rhodium octanoate dimer

A technology of octanoic acid rhodium and waste liquid, which is applied in the field of rhodium recovery, can solve the problems of low rhodium recovery rate, large loss, complicated purification process, etc., and achieve the effect of high rhodium recovery rate and purity, less feeding, and simple process

Inactive Publication Date: 2019-08-09
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of low rhodium recovery rate, large loss and complicated purification process in the prior art, the invention provides a method for reclaiming rhodium from the waste liquid of rhodium octanoate production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1. Take 1L of rhodium octanoate production waste liquid, which contains 480ppm rhodium, heat to 80°C, add concentrated hydrochloric acid, adjust the pH to 1, react for 2h and drop to 30°C, add 1.5mL of amine, stir for 1h, and let it stand After 12 hours, oil and water are separated; the separated oil phase is added with anti-boiling agent, and after stirring evenly, the oil phase is ashed by a temperature-programmed method, and the tail gas is absorbed with dilute ethanol aqueous solution and the absorption liquid is added to the next round of waste liquid for treatment ; The product after ashing is washed with water, filtered, the residue is dried, raised to a certain temperature and passed into dry hydrochloric acid gas, and the tail gas is absorbed with water; the product after passing through hydrochloric acid gas is washed with hydrochloric acid gas absorption liquid, and the solution is concentrated and dried , to obtain water-soluble rhodium trichloride wi...

Embodiment 2

[0014] Example 2. Take 1L of rhodium octanoate production waste liquid, which contains 480ppm rhodium, heat it to 60°C, add concentrated hydrochloric acid, adjust the pH to 1, react for 2h and drop it to 20°C, add 1.5mL of amine, stir for 1h, and let it stand After 12 hours, oil and water are separated; the separated oil phase is added with anti-boiling agent, and after stirring evenly, the oil phase is ashed by a temperature-programmed method, and the tail gas is absorbed with dilute ethanol aqueous solution and the absorption liquid is added to the next round of waste liquid for treatment ; The product after ashing is washed with water, filtered, the residue is dried, raised to a certain temperature and passed into dry hydrochloric acid gas, and the tail gas is absorbed with water; the product after passing through hydrochloric acid gas is washed with hydrochloric acid gas absorption liquid, and the solution is concentrated and dried , to obtain water-soluble rhodium trichlor...

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PUM

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Abstract

The invention discloses a method for recovering rhodium from production waste liquid of rhodium octanoate dimer. The method comprises the following steps of (1) heating the waste liquid to certain temperature, then, adding hydrochloric acid, cooling to certain temperature after a reaction is made for a period of time, adding an extracting agent, stirring, standing and conducting oil and water separation; (2) adding an anti-boiling agent into an oil phase obtained after separation, performing ashing treatment on the organic phase by employing a temperature programming method after uniform stirring, and absorbing tail gas with a diluted ethanol water solution; (3) washing a product obtained after ashing with water, filtering, drying residues, performing heating, performing drying and absorbing tail gas with water; and (4) performing washing, and taking a solution for concentrating and drying to obtain water-soluble rhodium chloride, wherein the water-soluble rhodium chloride can be reused as a raw material of producing the rhodium octanoate dimer; and the rhodium recovery rate is greater than 96 %, and the rhodium purity is higher than 99 %. The method provided by the invention has asimple process, and is capable of effectively removing a lot of salts, so that roasting efficiency is increased, energy consumption and rhodium losses are effectively reduced, and the recovered rhodium chloride is high in purity, and can be used as the raw material for continued use.

Description

technical field [0001] The invention relates to the technical field of precious metal recovery and aims to provide a method for recovering rhodium from the waste liquid of rhodium octanoate production. Background technique [0002] The content of rhodium in the earth's crust is very small. It has high utilization value and high price. It is a scarce resource and has been widely used in the fields of electronic information, aerospace, medicine and chemical industry. In order to maximize the utilization of rhodium resources and reduce losses, it is necessary to recover rhodium as much as possible. Since the complexes of rhodium in different organic solvents are very different, the recovery of rhodium in different organic solvents requires different treatment methods. At present, there are three main methods for recovering rhodium in organic solution: extraction method, incineration method and digestion method. The extraction method is to add a certain amount of acid to the r...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/00C22B11/00C01G55/00
CPCC01G55/005C22B1/005C22B7/006C22B11/042Y02P10/20
Inventor 苏石龙张雄波候文亮左川侯文明罗媛沈峰吴冉韩媛夏永明
Owner SINO PLATINUM METALS CO LTD
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