Recovery process of rhodium-containing waste catalyst solution

A waste catalyst and solution technology, applied in chemical recovery, ruthenium/rhodium/palladium/osmium/iridium/platinum compounds, inorganic chemistry, etc., can solve the problems of low rhodium recovery rate and complicated process, and achieve efficient and fast recovery methods Effect

Inactive Publication Date: 2013-02-06
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new technology makes it possible for ruthenium (Rh) metal powders that were previously used only once or twice before being discarded into landfills quickly recovering more than 97 percent of its original content.

Problems solved by technology

This patents describes different ways to extract or separate valuable metals like silver (Ag) from various materials containing these compounds. One way involves burning them down into ash after they have been extracted through evaporation techniques. Other options involve separating the pyrolysis products formed due to decomposition reactions between oxygenated bases and other substances produced when decomposing certain types of molecules called organochlorine monomers. These technical problem addressed by this patented technology include finding efficient processes for efficiently removing unwanted residues while minimizing damage caused by excessively strong reducing agents commonly found on zirconia based catalysis systems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take by weighing 50.00 grams of catalyst waste liquid containing rhodium 3101ppm, the quality containing rhodium in this catalyst waste liquid is 0.1550 grams, then adding mass concentration thereto is 1.20 grams of sodium hydroxide solution of 30%, and then under the condition of 80 ℃ Heat and stir for 2 hours, let stand for 6 hours, decant the upper layer liquid to obtain the remaining solid, then dry the remaining solid at 120°C to obtain anhydrous rhodium hydroxide with a quality of 0.2251 grams, and the recovery rate of rhodium reaches 97.13 %.

Embodiment 2

[0019] Take by weighing 50.00 grams of catalyst waste liquid containing rhodium 3101ppm, contain 0.1550 grams of rhodium in this catalyst waste liquid, add mass concentration then and be 5.06 grams of potassium hydroxide solution of 20%, heated and stirred 5 hours under the condition of 100 ℃, static Set aside for 6 hours, decant the upper layer liquid to obtain the remaining solid, and then dry the remaining solid at 120°C to obtain anhydrous rhodium hydroxide with a mass of 0.2278 g and a rhodium recovery rate of 98.30%.

Embodiment 3

[0021] Take by weighing the catalyst waste liquid 50.00 grams that contains rhodium 3101ppm, the quality 0.1550 gram that contains rhodium in its catalyst waste liquid, add mass concentration then in the waste liquid that contains catalyst and be 5.64 grams of cesium hydroxide solution of 40%, again at 92 ℃ Heating and stirring under the conditions for 1 hour, standing still for 6 hours, decanting the upper liquid, and drying the remaining solid at 120°C to obtain anhydrous rhodium hydroxide with a mass of 0.2256 g and a rhodium recovery rate of 97.35%.

[0022] The invention utilizes the principle that the dissolution constant of rhodium hydroxide in the aqueous solution is extremely small, so that the rhodium in the solution is separated from the waste catalyst in the form of precipitation; the recovery method is efficient and quick, the rhodium recovery rate is high, the recovery process is simple, and the cost is low , can effectively recover the rhodium in the catalyst was...

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Abstract

The invention relates to the field of catalyst recycling in chemical industry, in particular to a recovery process of rhodium-containing waste catalyst solution. The process adopts strong base as precipitation reagent so that rhodium in the solution is separated from waste catalyst solution in precipitation form. The strong base is selected from any one of sodium hydroxide, potassium hydroxide and cesium hydroxide. The solution of the strong base is added to rhodium-containing waste catalyst solution and heating and stirring are carried out for 1-5h at the temperature of 80-100 DEG C so that a precipitation reaction occurs, namely, solid rhodium hydroxide can be obtained. The mol ratio of rhodium to strong base in the waste catalyst solution is 1: (6-12). By adopting the principle that the dissolution constant of rhodium hydroxide in water solution is extremely small, rhodium in the solution is separated from the waste catalyst solution in precipitation form; and the recycling method is efficient and quick, and the recovery rate of rhodium is more than 97%.

Description

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Claims

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Application Information

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Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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