Production method for circularly recovering ultrafine nickel powder from shadow mask of discarded CRT (Cathode Ray Tube) screen
A technology of recycling and production methods, which is applied in the field of metallurgy and chemical industry, can solve the problems of high process energy consumption, pollution of production environment and living environment, shortage of nickel sheet raw material supply, etc., and achieve the effect of low energy consumption and elimination of water pollution
Active Publication Date: 2013-05-15
JIANGXI GREEN ECO MFG RESOURCE CYCLE
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Problems solved by technology
[0006] The traditional electrolysis method can produce high-purity nickel sheets, but the energy consumption of the process is very high, and during the electrolysis process, the sulfate and hydrochloride of nickel volatilize acid mist, which will cause pollution to the production environment and the living environment. quite serious pollution
Therefore, the state restricts: in areas with dense population and energy shortages, it is not allowed to invest in the construction of electrolytic nickel production process, which greatly limits the development of this industry, and leads to a serious shortage of raw material supply of nickel sheet
Moreover, the production of nickel raw materials based on ore leads to excessive consumption of raw ore resources, which does not conform to the resource recycling model of a conservation-minded society
Method used
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[0036] Such as figure 1 , is shown as a schematic block diagram of the method embodiment of the present invention, including the following stages: until nickel sulfide acid dissolution step D) wet separation stage embodiment, thereafter E) extraction and enrichment nickel step embodiment, F) synthesis Nickel oxalate step embodiment, G) nickel oxalate powder reduction step embodiment. details as follows:
[0037] Examples of wet separation stages:
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Abstract
The invention relates to a production method for circularly recovering ultrafine nickel powder from a shadow mask of a discarded CRT (Cathode Ray Tube) screen. The production method comprises the following steps of: cutting of the CRT screen, screening by using a development process, strong acid dissolution and leaching, nickel precipitation by sulphur ions, acid dissolution of filter residues, extraction and enrichment, synthesis of nickel oxalate, high-temperature reduction and crushing, and therefore the ultrafine nickel powder which is more than 99.5 percent in content and 0.5-3.0mu m in FSSS (Furnace Safeguard Supervisory System) granularity can be obtained. The production method disclosed by the invention is especially suitable for separation and purification of nickel from nicochrome with high iron content, can be used for recovering metallic nickel from the shadow mask of the discarded CRT screen and circularly producing the ultrafine nickel powder, is relatively simple in process and operation, free of consumption of a great deal of electric energy and easy to implement and has an actual meaning in development of circular utilization of nickel resources; the ultrafine nickel powder is high in purity and small in particle size; and the secondary pollution in the production process is remarkably reduced.
Description
technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, more specifically, the invention relates to a technology and method for recycling metal resources from waste electronic products to produce metallurgical products. Background technique [0002] Nickel metal has many excellent physical and chemical properties, such as good oxidation resistance: in the air, a NiO film is formed on the surface of nickel, which can prevent further oxidation. Experiments have proved that nickel with a purity of 99% will not rust within 20 years . Nickel is also highly resistant to corrosion, especially to caustic soda. In 50% boiling caustic soda solution, the annual corrosion rate of nickel does not exceed 25 microns, so nickel is widely used to manufacture various types of Stainless steel, soft magnetic alloy and alloy structural steel; nickel and chromium, copper, aluminum, cobalt and other elements can form heat-resistant alloys, electric...
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IPC IPC(8): C22B7/00C22B3/06C22B3/20B22F9/20C22B23/00
CPCY02P10/20
Inventor 苏陶贵王勤闫梨何显达梁小奎罗松
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE