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A method for recovering valuable metals from nickel-titanium-palladium target material waste

A valuable metal and target technology, applied in the direction of improving process efficiency, can solve the problems of nitrogen oxides generation, increased energy consumption, environmental pollution, etc., to achieve a short recovery period, improve recovery rate and purity, and reduce equipment investment. Effect

Active Publication Date: 2022-06-17
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process uses nitric acid, which will produce nitrogen oxides, and palladium will be precipitated after removing nitric acid. Adding sodium sulfide will easily produce toxic gas hydrogen sulfide, which will cause problems such as increased energy consumption, environmental pollution, and wastewater treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for recovering valuable metals from nickel-titanium-palladium target waste, comprising the steps of: weighing 500 g of nickel-titanium-palladium target waste, placing it in a primary sulfuric acid solution with a concentration of 4 mol / L, and performing preliminary acid leaching. The acid leaching temperature was controlled at 95°C, and the initial acid leaching time was 8 hours. After the initial acid leaching, the leaching solution was filtered to obtain a nickel-rich leaching solution and a titanium-rich palladium filter cake. The titanium-rich palladium filter cake was washed three times with pure water, and the nickel leaching rate was 98.2%. After filtering, adding sodium hydroxide to the nickel-rich leachate to adjust the pH of the nickel-rich leachate to be 2 and filtering, and the filtrate reclaims the nickel sulfate by-product after concentrating and crystallizing; the titanium-rich palladium filter cake, the first oxidant-sodium chlorate, the second C...

Embodiment 2

[0031] A method for reclaiming valuable metals from nickel-titanium-palladium target waste, comprising the steps of: weighing 500 g of nickel-titanium-palladium target waste, placing 2 mol / L hydrochloric acid and 2 mol / L sulfuric acid grades Preliminary acid leaching is carried out in the mixed acid solution, the initial acid leaching temperature is controlled at 80 ° C, the initial acid leaching time is 4 hours, and after the preliminary acid leaching is completed, filtration is performed to obtain a nickel-rich leaching solution and a titanium-rich palladium filter cake, and the titanium-rich palladium filter cake is purified with water. Washed three times, the nickel leaching rate was 99.2%; after filtration, sodium hydroxide was added to the nickel-rich leachate to adjust the pH of the nickel-rich leachate to be 3, and then filtered, and the filtrate was concentrated and crystallized and the nickel chloride by-product was recovered; An oxidizing agent-hydrogen peroxide, add...

Embodiment 3

[0033]A method for recovering valuable metals from nickel-titanium-palladium target waste, comprising the steps of: weighing 500 g of nickel-titanium-palladium target waste, placing it in a primary sulfuric acid solution with a concentration of 4 mol / L, and performing preliminary acid leaching. The acid leaching temperature was controlled at 95°C, and the initial acid leaching time was 6 hours. After the initial acid leaching, the leaching solution was filtered to obtain a nickel-rich leaching solution and a titanium-rich palladium filter cake. The titanium-rich palladium filter cake was washed three times with pure water, and the nickel leaching rate was 98.2%. After filtering, adding saturated lime water to the nickel-rich leachate to adjust the pH of the nickel-rich leachate to be 2.5 and filtering, and the filtrate reclaims the nickel sulfate by-product after concentrating and crystallizing; the titanium-rich palladium filter cake, the first oxidant-sodium chlorate, the seco...

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Abstract

The invention discloses a method for recovering valuable metals from nickel-titanium-palladium target material waste, which comprises the following steps: S1: preliminary acid leaching; S2: recovery of nickel; S3: secondary oxidation acid leaching; S4: recovery of titanium; S5: oxidize and precipitate palladium; S6: wash; S7: recover palladium. This method can effectively separate and recover precious metal palladium, and valuable metals nickel and titanium; (2) This method can effectively avoid the use of nitric acid to dissolve waste in the traditional process and the subsequent steps of nitrate removal treatment, which greatly shortens the palladium recovery process and effectively reduces (3) The method improves the recovery rate and purity of palladium; (4) The whole process of the method is simple to operate, less equipment investment, and the precious metal recovery cycle is short.

Description

technical field [0001] The invention belongs to the field of resource recovery, in particular to a method for recovering valuable metals from nickel-titanium-palladium target waste. Background technique [0002] Palladium is a precious metal with elegant color and stable properties. It is silver-white and has excellent physical and chemical properties. Due to its unique electrical and optical properties, it is widely used in modern industry and high-tech industries. With the continuous development of technology, the demand for palladium and its products and alloy materials is increasing. However, the content of palladium in nature is small, and it is difficult to extract from mineral raw materials, so the cost is high and expensive, and it can be efficiently recovered from secondary resources. Palladium has important economic benefits. [0003] The traditional technical method for recycling palladium-containing wastes is mainly to use nitric acid or aqua regia and other nit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B23/00C22B11/00C22B34/12
CPCC22B7/007C22B23/043C22B23/0423C22B11/046C22B34/1245Y02P10/20
Inventor 行卫东李康朱刘
Owner FIRST RARE MATERIALS CO LTD