Nickel powder with large furnace safety supervision system (FSSS) particle size and preparation method thereof
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A nickel powder and particle size technology, which is applied in the field of large FSSS particle size nickel powder preparation, can solve the problems of uneven distribution, large nickel powder FSSS, and large power consumption, and achieve large particle size, low equipment requirements, and production efficiency. high effect
Active Publication Date: 2012-08-29
JINGMEN GEM NEW MATERIAL +1
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Although the nickel powder produced by electrolysis has a large particle size, it consumes a lot of electricity and costs a lot
Some people use the method of pyrolytic reduction to prepare nickel powder. The prepared nickel powder has a large FSSS, but the D50 particle size is too large and the distribution is not very uniform.
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[0014] The embodiment of the present invention provides a kind of preparation method of large FSSS nickel powder, comprises the following steps:
[0015] Step S01, reacting ammonium oxalate and nickel chloride for 10-30 minutes at a temperature of 50-60°C and a pH value of 1.5-3.0 to obtain nickel oxalate precipitation;
[0016] Step S02, subjecting the nickel oxalate precipitate to flash drying and crushing to obtain a nickel oxalate precursor;
[0017] Step S03, reducing the nickel oxalate precursor at a temperature of 450-550°C to obtain a nickel powder precursor;
[0018] Step S04, performing turbine crushing on the nickel powder precursor, and then performing airflow crushing to obtain nickel powder.
[0019] Specifically, the large FSSS particle size referred to in the embodiments of the present invention means that the FSSS particle size is greater than 3 microns.
[0020] Specifically, in step S01, the ammonium oxalate used is not limited, and can be commercially ava...
example
[0047] Prepare a 150g / L oxalic acid solution, add liquid ammonia, adjust the pH to 4.3 to obtain an ammonium oxalate solution, and keep the heating temperature at 70°C;
[0048] The ammonium oxalate solution is reacted with 90g / L nickel chloride solution in a reactor, the nickel chloride flow rate is controlled to be 1000-1500L / min, and the ammonium oxalate flow rate is 2500-3500L / min. Adjust the pH value of the reaction to 2.0, the reaction time is 12 minutes, age for 10 minutes, filter with a centrifuge, and wash with hot pure water at 80°C;
[0049] The washed nickel oxalate precipitate is subjected to flash drying and crushing treatment, and the flash drying and crushing machine can sort out some fine particles to obtain a nickel oxalate precursor with uniform particle size.
[0050] Change the reaction pH value, temperature, and reaction time to obtain nickel oxalate precursors with different particle sizes, as follows:
[0051]
[0052]
[0053] It can be conclude...
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Abstract
The invention is suitable for the technical field of metallurgy and provides nickel powder with large furnace safety supervision system (FSSS) particle size and a preparation method thereof. The preparation method of the nickel powder comprises the following steps that: ammonium oxalate and nickel chloride react for 10 to 30 minutes under the conditions that the temperature is 50 to 60 DEG C and the pH value is 1.5 to 3.0 so as to obtain nickel-oxalate precipitates; the operations of flashing, drying and crushing are carried out on the nickel-oxalate precipitates so as to obtain a nickel-oxalate precursor; the treatment of reducing is carried out on the nickel-oxalate precursor under the condition that the temperature is 450 to 550 DEG C so as to obtain a nickel powder precursor; and the operation of turbine crushing is carried out on the nickel powder precursor, and then the operation of airflow crushing is carried out so as to obtain the nickel powder. The nickel powder prepared by the preparation method provided by the invention has large FSSS particle size, small D50 particle size, narrow particle-size distribution and high purity and is in a porous class spherical pattern, the performance approaches to the T123 carboxylic nickel powder of the INCO company, and the requirement of performance of powder metallurgy and the like can be met. The nickel powder has extensive application field. The preparation method provided by the invention is simple to operate, has low requirement to equipment and high production benefit, is friendly to the environment and is very suitable for industrialized production.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing nickel powder with a large FSSS particle size and the nickel powder. Background technique [0002] At present, alloy materials and powder metallurgy require that the FSSS particle size of nickel powder is large, the D50 particle size is small, and the distribution is narrow. Generally, T123 carboxylated nickel powder produced by INCO Company is used, but the carboxylated method is toxic. Although the nickel powder produced by electrolysis has a large particle size, it consumes a lot of electricity and costs a lot. Some people use the method of pyrolytic reduction to prepare nickel powder. The prepared nickel powder has a large FSSS, but the D50 particle size is too large and the distribution is not very uniform. Contents of the invention [0003] In view of this, the embodiment of the present invention provides a method for preparing nick...
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