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Separation method of various precious metals

A separation method and technology of precious metals, applied in the field of chemical separation, to achieve the effect of reducing losses, realizing recycling and reuse, and simple process

Active Publication Date: 2016-01-20
南京东锐铂业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is a lack of a separation method that can separate multiple precious metals with good separation effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of separation method of multiple precious metals of the present invention, comprises the steps:

[0041] (1) Fire method: mix the material and sodium peroxide at a mass ratio of 1:3, put it into a crucible and heat it to a temperature of 700°C, and after 2 hours the material is completely melted, take it out of the crucible and cool it down;

[0042] (2) Pretreatment before distillation: dissolve the cooled frit in water into a slurry, add sulfur dioxide to neutrality; wash with water at 70°C to remove the salt for later use; through this pretreatment, avoid the pipeline from being salted during the next distillation Clogging reduces the content of sodium ions in the ruthenium and osmium absorption solution. Therefore, both the production safety and the product quality of ruthenium and osmium are guaranteed.

[0043] Distillation and separation of osmium and ruthenium: transfer the above slag to the reaction kettle in batches for distillation;

[0044] Use sulf...

Embodiment 2

[0065] The difference between embodiment 2 and embodiment 1 is: a kind of separation method of multiple precious metals of the present invention, comprises the following steps:

[0066] In step (1), the fire method: mix the material and sodium peroxide at a mass ratio of 1:3, put it into a crucible and heat it to a temperature of 750°C, and after 2.5 hours when the material is completely melted, remove it from the crucible remove and cool;

[0067] In step (2), wash off the salt with water at 75°C for subsequent use;

[0068] In step (3), pretreatment before iridium extraction: neutralize the distillation raffinate, wash with water at 75°C to remove the salt for later use, and send it to the iridium post;

[0069] In step (6), keep solution to be 4mol / l hydrochloric acid; Extract platinum with tributyl phosphate, back extract platinum with 1mol / l sodium hydroxide solution, send platinum refining and purifying;

[0070] In step (7), palladium is separated by xanthate precipit...

Embodiment 3

[0072] The difference between embodiment 3 and embodiment 1 is: a kind of separation method of multiple precious metals of the present invention, comprises the following steps:

[0073] In step (1), put it into a crucible and heat it to a temperature of 800° C. After 3 hours, after the material is completely melted, take it out from the crucible and cool it down;

[0074] In step (2), wash off the salt with water at 80°C for subsequent use;

[0075] In step (3), pretreatment before iridium extraction: neutralize the distillation raffinate, wash with water at 80°C to remove the salt for later use, and send it to the iridium post;

[0076] In step (6), keep solution to be 5mol / l hydrochloric acid, and account for the sulfuric acid of 0.5% of solution volume;

[0077] Extract platinum with tributyl phosphate, then back-extract platinum with 1.5mol / l sodium hydroxide solution, and send platinum for refining and purification;

[0078] In step (7), palladium is separated by xantha...

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PUM

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Abstract

The invention discloses a separation method of various precious metals. The separation method comprises the following steps: (1) pyropenic process; (2) pretreatment before distillation; (3) pretreatment before iridium extraction: neutralizing distillation residual liquid, washing with water of 70-80DEG C to remove salt for later use, and delivering to an iridium station; (4) iridium extraction; (5) sequential recovery of platinum, palladium and rhodium from iridium precipitation mother liquid; (6) separation of platinum by adopting a solvent extraction method; (7) separation of palladium by adopting a xanthate precipitation method; and (8) separation of rhodium by adopting a copper powder substitution method. The separation method is simple in technology, energy-saving and environment-friendly, does not generate pollutants, and can be used for effectively separating various heavy metals.

Description

technical field [0001] The invention relates to a chemical separation method, in particular to a separation method of multiple precious metals. Background technique [0002] In the recycling process of waste precious metal materials, complex materials containing more than three kinds of precious metals (such as platinum, palladium, rhodium, iridium, osmium and ruthenium) are often encountered. The previous technology was only for a certain precious metal, and there were at most three kinds, and the technology was not perfect, it was not easy to operate, and the separation effect and yield were not ideal. In the production process, it is necessary to completely separate the precious metal components from each other and make them easy to recycle, and the higher the yield, the better. This just needs to improve or change original correlation method. [0003] In this process, all the materials are melted by the fire method first. In order to reduce the loss of volatile materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B5/16C22B3/44C22B3/46C22B3/38
CPCY02P10/20
Inventor 姚志刚王健李忠飞
Owner 南京东锐铂业有限公司
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