Method for recovering valuable metal 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: 2021-03-16
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 material waste, comprising the steps of: weighing 500 g of nickel-titanium-palladium target material waste, placing it in a primary sulfuric acid solution with a concentration of 4mol / L for preliminary acid leaching, and initially The acid leaching temperature was controlled at 95°C, the initial acid leaching time was 8 hours, and after the initial acid leaching, it was filtered to obtain nickel-rich leaching solution and 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 leaching solution to adjust the pH of the nickel-rich leaching solution is 2, and the filtrate is concentrated and crystallized to reclaim the nickel sulfate by-product; the rich titanium palladium filter cake, the first oxidant-sodium chlorate, and the second Aci...

Embodiment 2

[0031] A method for recovering valuable metals from nickel-titanium-palladium target material waste, comprising the steps of: weighing 500 g of nickel-titanium-palladium target material waste, placing it in hydrochloric acid with a concentration of 2 mol / L and sulfuric acid with a concentration of 2 mol / L Preliminary acid leaching is carried out in the mixed acid solution, the temperature of the initial acid leaching is controlled at 80°C, the initial acid leaching time is 4 hours, and after the preliminary acid leaching is completed, it is filtered to obtain a nickel-rich leaching solution and a titanium-rich palladium filter cake, and the titanium-rich palladium filter cake is washed with pure water After washing three times, the nickel leaching rate was 99.2%. After filtering, sodium hydroxide was added to the nickel-rich leaching solution to adjust the pH of the nickel-rich leaching solution to be 3. After filtration, the filtrate was concentrated and crystallized to recover...

Embodiment 3

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

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Abstract

The invention discloses a method for recovering valuable metal from nickel-titanium-palladium target material waste. The method comprises the following steps of S1, conducting preliminary acid leaching; S2, recovering nickel; S3, conducting secondary oxidation acid leaching; S4, recovering titanium; S5, oxidizing and precipitating palladium; S6, washing; and S7, recovering the palladium. Accordingto the method, the precious metal palladium and the valuable metal nickel and titanium can be effectively separated and recycled; (2) the steps of dissolving waste by using nitric acid, conducting subsequent denitration treatment and the like in the traditional process can be effectively avoided, the palladium recovering process is greatly shortened, and the energy consumption and the emission ofsewage and waste gas are effectively reduced; (3) the recovery rate and purity of the palladium are improved; and (4) the whole technological process of the method is simple to operate, less in equipment investment and short in precious metal recovery period.

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 material waste. Background technique [0002] Palladium is a noble metal with elegant color and stable properties. It is silvery 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, but palladium is less in nature and 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 process of recovering palladium-containing waste is mainly to use nitric acid or aqua regia and other mixed acids containing nitric acid ...

Claims

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Application Information

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Patent Type & Authority Applications(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
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