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Efficient synthesis method of rhodium nitrate solution

A synthesis method, rhodium nitrate technology, applied in chemical instruments and methods, ruthenium/rhodium/palladium/osmium/iridium/platinum compounds, inorganic chemistry, etc., can solve the problems of high impurity content, high cost, loss of rhodium, etc., to achieve Effects of low impurity content, improved efficiency, and less loss of rhodium

Active Publication Date: 2018-07-10
中船黄冈贵金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a simple, fast, low cost and less rhodium loss solution for the problems of complex process conditions, low efficiency, high cost, high rhodium loss and high impurity content in the existing rhodium nitrate solution synthesis technology. , the method for preparing rhodium nitrate solution by rhodium powder with low impurity content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Get 100g rhodium powder, get 300g barium peroxide powder according to the weight of 3 times of rhodium powder weight in addition, the two continuous ball milling 9 hours in agate ball mill jar. The mixed mixture was transferred to a corundum crucible and fired in a muffle furnace at 800 °C for 3 hours. Transfer the calcined solid mixture to a single-layer glass reactor, add water to wet and disperse the solid, add 9 mL of concentrated hydrochloric acid per gram of rhodium powder for reaction, and start heating the solution at the same time, stirring for 3.5 Hour, promptly obtain the chlororhodium acid solution that contains a large amount of barium chloride. While stirring, add concentrated sulfuric acid dropwise to the chlororhodium acid solution, the amount of concentrated sulfuric acid added is slightly more than the theoretical amount calculated according to the stoichiometric ratio. The solid-liquid mixture containing a large amount of barium sulfate precipitates ...

Embodiment 2

[0050] Get 100g rhodium powder, get 300g barium peroxide powder according to the weight of 3 times of rhodium powder weight in addition, the two continuous ball milling 12 hours in agate ball mill jar. The mixed mixture was transferred to a corundum crucible and fired in a muffle furnace at 800 °C for 3 hours. Transfer the calcined solid mixture to a single-layer glass reactor, add water to wet and disperse the solid, add 9 mL of concentrated hydrochloric acid per gram of rhodium powder for reaction, and start heating the solution at the same time, stirring for 3.5 Hour, promptly obtain the chlororhodium acid solution that contains a large amount of barium chloride. While stirring, add concentrated sulfuric acid dropwise to the chlororhodium acid solution, the amount of concentrated sulfuric acid added is slightly more than the theoretical amount calculated according to the stoichiometric ratio. The solid-liquid mixture containing a large amount of barium sulfate precipitates...

Embodiment 3

[0052] Get 100g rhodium powder, get 300g barium peroxide powder according to the weight of 3 times of rhodium powder weight in addition, the two continuous ball milling 12 hours in agate ball mill jar. The mixed mixture was transferred to a corundum crucible and fired in a muffle furnace at 850 °C for 3 hours. Transfer the calcined solid mixture to a single-layer glass reactor, add water to wet and disperse the solid, add 9 mL of concentrated hydrochloric acid per gram of rhodium powder for reaction, and start heating the solution at the same time, stirring for 3.5 Hour, promptly obtain the chlororhodium acid solution that contains a large amount of barium chloride. While stirring, add concentrated sulfuric acid dropwise to the chlororhodium acid solution, the amount of concentrated sulfuric acid added is slightly more than the theoretical amount calculated according to the stoichiometric ratio. The solid-liquid mixture containing a large amount of barium sulfate precipitates...

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Abstract

The invention discloses an efficient synthesis method of a rhodium nitrate solution. The basic principle is a three-step synthesis method; in the first step, rhodium powder is dissolved to obtain a chlororhodic acid solution; in the second step, chlororhodic acid is converted into rhodium hydroxide precipitates; in the third step, the rhodium hydroxide precipitates are dissolved in nitric acid toobtain the rhodium nitrate solution. Compared with the prior art, the efficient synthesis method has the advantages that through a specific pre-grinding technology, the full mixing of the rhodium powder and barium peroxide is ensured, so that the goal that the rhodium powder is almost completely converted into soluble oxides by using the barium peroxide being 3 to 3.5 times of the weight of the rhodium powder is realized; the conversion rate reaches 99.7 percent or higher; meanwhile, the efficient solid and liquid separation technology is combined; the impurity content in the rhodium nitrate solution is enabled to be low enough.

Description

technical field [0001] The invention relates to a preparation method of rhodium nitrate solution, in particular to a preparation method of converting rhodium powder into rhodium hydroxide and then synthesizing the rhodium nitrate solution. Background technique [0002] Rhodium is an important platinum group precious metal, which plays an irreplaceable role in many key fields. Rhodium catalyst is widely used in automobile industry catalysts, it forms a "three-way catalyst" with platinum and palladium, and is used in the efficient treatment of automobile exhaust. At the same time, rhodium catalyst is also a catalyst for the synthesis of important chemical products (such as acetic acid). In recent years, the market demand for rhodium catalysts is huge, which directly drives the demand for rhodium nitrate solution, a precursor substance used for rhodium catalyst synthesis. Facing the huge market demand, it is inevitable to improve the production efficiency of rhodium nitrate so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00
CPCC01G55/00
Inventor 彭伟冉龙国刘显杰彭戴张辛潔
Owner 中船黄冈贵金属有限公司
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