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Method for purification and preparation of high-purity chromium using electro-plating chromium refuse

A technology for electroplating chromium and waste residues, which is applied in the direction of improving process efficiency, can solve the problems of low value utilization rate of chromium electroplating waste residues, and achieve the effects of improving the utilization value, good product quality and eliminating pollution.

Inactive Publication Date: 2006-01-11
锦州市金属材料研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem of low value utilization rate of electroplating chromium waste residue, and provide a method for preparing high-purity chromium by purifying electroplating chromium waste residue, directly using electroplating chromium waste residue to produce high-purity chromium, turning waste into treasure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1.1. The waste slag of electroplating chromium is firstly subjected to impurity removal treatment to remove the impurities in it, then to magnetic separation treatment to remove the ferromagnetic substances in it, and then to acid leaching treatment to remove the rust spots on the surface, and then washed with water to wash away After drying the remaining acidic solution and other impurities, add the treated chrome plating waste residue into the vacuum heating furnace;

[0014] 1.2. Start the vacuum system, when the vacuum degree reaches 8×10 -2 Pa, stop vacuuming, and continuously feed high-purity hydrogen as the reaction gas, the purity of high-purity hydrogen is 99.999%, the flow rate of high-purity hydrogen is 200 liters / hour, and the reaction tail gas is ignited;

[0015] 1.3. While feeding high-purity hydrogen, heat the material. The heating time is not limited. The material is heated to 1200 ° C, and the reduction reaction removes oxygen and nitrogen gas impuriti...

Embodiment 2

[0017] 2.1. The electroplating chromium waste residue is firstly subjected to impurity removal treatment to remove impurities in it, then to magnetic separation treatment to remove ferromagnetic substances in it, and then to acid leaching treatment to remove rust spots on its surface, and then washed with water to remove After drying the remaining acidic solution and other impurities, add the treated chrome plating waste residue into the vacuum heating furnace;

[0018] 2.2. Start the vacuum system, when the vacuum reaches 6×10 -2 Pa, stop vacuuming, and continuously feed high-purity hydrogen as reaction gas, the purity of high-purity hydrogen is 99.9999%, the flow rate of high-purity hydrogen is 600 liters / hour, and the reaction tail gas is ignited;

[0019] 2.3. While feeding high-purity hydrogen, heat the material to 1600°C, the reduction reaction removes oxygen and nitrogen gas impurities, and continue to react at this temperature for 5 hours, cool to room temperature and ...

Embodiment 3

[0021] 3.1. The electroplating chromium waste residue is firstly subjected to impurity removal treatment to remove the impurities in it, then to magnetic separation treatment to remove the ferromagnetic substances in it, and then to acid leaching treatment to remove rust spots on the surface, and then washed with water to remove After drying the remaining acidic solution and other impurities, add the treated chrome plating waste residue into the vacuum heating furnace;

[0022] 3.2. Start the vacuum system, when the vacuum reaches 1×10 -1 Pa, stop vacuuming, and continuously feed high-purity hydrogen as reaction gas, the purity of high-purity hydrogen is 99.99%, the flow rate of high-purity hydrogen is 500 liters / hour, and the reaction tail gas is ignited;

[0023] 3.3. While feeding high-purity hydrogen, heat the material to 1400°C, the reduction reaction removes oxygen and nitrogen gas impurities, and continue to react at this temperature for 8 hours, cool to room temperatur...

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Abstract

The process method of this invention: after removing impurity, selecting magnetism, acid dipping, washing, drying, put electroplating chrome dealt into vacuo heating furnace: when degree of vacuum is no more than 1*10 to the power -1 Pa, stop vacuumizing, react continuously in this scale of temperature, cool to room temperature out of furnace, gain high pure chrome purified from the process of this invention. The advantage is: electrolying chrome waste low usefactor as material produces high pure chrome, improving the value of electrolying chrome waste, changing waste into valuables,and,with good quality, high purity, up to 99.5-99.9,gas impurities under 300ppm.

Description

technical field [0001] The invention relates to a method for purifying and preparing high-purity chromium by using electroplating chromium waste residue. Background technique [0002] High-purity chromium is a precious metal raw material, which is widely used in the aerospace industry and the electronics industry, such as chromium-containing superalloys commonly used in the aerospace industry, flat-screen displays in the electronics industry, and chrome-plated thin-film hard disks in computers, etc. . At present, the production of high-purity chromium is to use insoluble anodes under the action of direct current to reduce the chromium ions in the chromium-containing aqueous solution electrolyte to be deposited on the cathode to produce metal chromium with low impurity content, and then go through degassing Purification treatment to obtain high-purity chromium. There are two kinds of chromium-containing aqueous solution electrolytes: trivalent chromium solution and hexavale...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/32
CPCY02P10/20
Inventor 王明秋崔德奎吴岩刚黎明
Owner 锦州市金属材料研究所