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A kind of method for preparing nickel powder by electrolysis

A technology for nickel powder and ammonia decomposition, which is applied in the fields of electrolytically preparing nickel powder and metal nickel powder, can solve the problems of long production process, high energy consumption for two treatments, low production efficiency, etc., and achieves significant reduction in metal loss and energy saving effect. , the effect of high purity

Active Publication Date: 2017-04-19
CHONGQING YOUYAN ZHONGYE NEW MATERIAL
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AI Technical Summary

Problems solved by technology

This kind of process has a long production process, cumbersome logistics processing and transshipment, low production efficiency, high labor intensity for workers, and high energy consumption for two processes

Method used

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Embodiment Construction

[0014] The following examples are used to describe the present invention in detail. It is necessary to point out that the following examples are only used to further illustrate the present invention, and cannot be understood as limiting the scope of protection of the present invention. Those skilled in the art can use the above-mentioned present invention. SUMMARY OF THE INVENTION Some non-essential improvements and adjustments have been made to the present invention.

[0015] A method for preparing nickel powder by electrolysis, which is characterized in that it mainly proceeds as follows:

[0016] (1) The electrolytic nickel powder obtained by electrolysis is washed to neutrality by using deionized water or membrane-filtered pure water, vacuum filtration or high-pressure gas dehydration to a water content of about 20wt%, and put into a stainless steel hopper for use;

[0017] (2) Start the ammonia decomposition device to a stable gas production state, the ammonia decomposition gas ...

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Abstract

An electrolytic preparation method of nickel powder includes electrolysis, washing, dehydration, drying and reduction steps, the drying and reduction steps are integrally performed in a steel belt type drying reduction furnace, the drying reduction continuous processing time is 2-5 hours, the belt is controlled to be speed 30-250mm / min, the wet nickel powder spreading thickness is 10mm-50mm, each temperature zone is controlled as follows: 1 zone temperature and 2 zone temperature of a drying section are respectively 450-580DEG C and 420-550 DEG C, 1 zone temperature, 2 zone temperature and 3 zone temperature of a reduction section are respectively 370-530 DEG C, 370-530 DEG C, and 350-480 DEG C, nitrogen flow rate of the drying section is 5-20m <3> / h, nitrogen flow rate of the reducing section is 5-20m <3> / h, decomposition ammonia flow rate of the reducing section is 5-20m <3> / h, protection nitrogen flow rate of the furnace tail is 2-10m<3> / h, and purification nitrogen flow rate of the furnace tail is 3-10m<3> / h. A drying reduction integrated process is obvious in energy saving effect, and at the same time, prepared electrolytic nickel powder products are of good quality.

Description

Technical field [0001] The invention relates to a method for preparing metallic nickel powder, in particular to a method for electrolytically preparing nickel powder, and belongs to the technical field of electrolytic powder production. Background technique [0002] Electrolytic nickel powder is an important non-ferrous metal powder, which is widely used in powder metallurgy products, diamond tools, battery materials, etc. The electrolysis method is the main preparation method for the preparation of nickel powder, which mainly undergoes electrolysis, washing, dehydration, drying, reduction, crushing, screening and other technological processes. The traditional steps of powder drying and reduction are drying and reduction step-by-step processing. This process requires the wet nickel powder to be dried in a rotary kiln or oven, crushed and screened, and then transported into the reduction furnace for hydrogen or ammonia decomposing atmosphere Perform a reduction process. This kin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C5/02B22F1/00B22F9/20B22F9/22
Inventor 陈林吴卫莫正彬
Owner CHONGQING YOUYAN ZHONGYE NEW MATERIAL
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