Method for reclaiming and purifying platinum and rhodium from waste material containing platinum and rhodium

A technology for platinum and rhodium waste, which is applied in the field of recycling and purifying precious metal platinum and rhodium, can solve problems such as production difficulties, achieve the effects of simple operation, good separation effect, and avoid the loss of rhodium

Inactive Publication Date: 2008-09-10
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to obtain high-purity precious metals, it is necessary to carry o

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The process and steps of this embodiment are as follows:

[0025] (1) Waste material pre-treatment: crushing treatment, according to the mass ratio of metal material: zinc powder = 1:4 ingredients, eutectic at 800 ℃, add aqua regia after cooling, heat and boil until it is completely dissolved, then evaporate the solution with low heat , Then add concentrated HCI to dissolve, and then evaporate to dryness again, three times in succession, until the nitrate is completely removed;

[0026] (2) Removal of base metals: adjust the pH of the solution after the above pretreatment to 1.5-3.5 with 20% NaOH, and flow through the strongly acidic ion exchange resin column at a linear velocity of 0.8 cm / min to remove the base metals in the solution; The base metal resin is darker than the resin without base metal adsorption. Based on this, it can be judged whether the base metal in the solution is cleaned. The base metal-loaded resin is soaked and regenerated with 6MHCI and can be reused...

Embodiment 2

[0036] (1) Waste pretreatment: crushing treatment, metal material: zinc powder = 1:3.6 ingredients, eutectic at 800°C, add aqua regia after cooling, heat and boil until completely dissolved, then evaporate the solution on low heat, and then add Dissolve concentrated HCl, evaporate to dryness again, three consecutive times, until the nitrate is completely eliminated;

[0037] (2) Removal of base metals: adjust the pH of the solution after the above pretreatment to 1.5-3.5 with 20% NaOH, and flow through the strongly acidic ion exchange resin column at a linear velocity of 1.0 cm / min to remove the base metals in the solution; The base metal ion exchange resin is soaked and regenerated with 6MHCI;

[0038] (3) Extraction and separation of platinum and rhodium: Adjust the acidity of the above solution for removing base metals to [H + ]2~5M as the water phase, TBP:260#solvent oil=1:0.5 as the organic phase, three-stage cross-flow extraction to separate platinum at a ratio of 1:1 to sep...

Embodiment 3

[0047] (1) Waste material pre-treatment: crushing treatment, metal material: zinc powder = 1:4.2 ingredients, eutectic at 800°C, add aqua regia after cooling, heat and boil until completely dissolved, then evaporate the solution on low heat, and then add Dissolve concentrated HCl, evaporate to dryness again, three consecutive times, until the nitrate is completely eliminated;

[0048] (2) Removal of base metals: adjust the pH of the solution after the above pretreatment to 2.0-3.5 with 20% NaOH, and flow through the strongly acidic ion exchange resin column at a linear velocity of 0.6 cm / min to remove the base metals in the solution; The base metal ion exchange resin is regenerated by soaking in 6MHCl;

[0049] (3) Extraction and separation of platinum and rhodium: Adjust the acidity of the above solution for removing base metals to [H + ]=3M, and then use the extractant tributyl phosphate to perform three-stage countercurrent extraction and separation of platinum from the solutio...

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PUM

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Abstract

The invention relates to a method for recycling and purifying platinum and rhodium from the waste materials containing platinum and rhodium, belonging to the noble metal chemical extracting technical field. The invention adopts the ion exchange method to eliminate the base metal and combines the solvent extraction technique and the leaching resin separation technique to separate and purify the noble metals of platinum and rhodium. The method is to recycle and purify the secondary resources of noble metals. The method has simple technique, convenient operation, high separation efficiency and high direct recovery rate. The ion exchange resin, the extracting agent and the leaching resin used in the method can be regenerated and recycled by simple methods; the emission is zero, thereby protecting the environment and contributing to the environmental protection.

Description

Technical field [0001] The invention relates to a method for recovering and purifying precious metal platinum and rhodium from waste materials containing platinum and rhodium, and belongs to the technical field of precious metal chemical extraction and separation. Background technique [0002] There is a shortage of platinum group precious metal resources in my country. The proven reserves of platinum group resources account for only three ten thousandths of the world's reserves, and the scale is small and the grade is low. Before the development of my country's Jinchuan resources, platinum group noble metals were basically not produced in China, and all domestic needs depended on imports. After the development of Jinchuan resources, about 90% still rely on foreign purchases. Recently, the price of platinum group metals in the domestic market has increased rapidly, with platinum at RMB 470 / g and rhodium powder at RMB 2,350 / g. Therefore, it is of great significance to extract and ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/42C22B11/00
CPCY02P10/20
Inventor 谈定生王松泰徐桂峰张耀军黄奇刘书祯
Owner SHANGHAI UNIV
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