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Preparation method and equipment for nano-grade superfine cobalt powder

An ultra-fine cobalt powder, nano-scale technology, applied in the field of preparation of ultra-fine cobalt powder, can solve the problems of expensive precipitant, difficult process implementation, lengthy ion process, etc., to achieve short process, easy process implementation, and control of process conditions easy effect

Inactive Publication Date: 2006-10-04
湖南鼎伦新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The precipitant used in this method is not only expensive, but also washes away Na + The ion process is lengthy and the process implementation is difficult

Method used

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  • Preparation method and equipment for nano-grade superfine cobalt powder

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Embodiment 1

[0016] (1) The precursor of nano-scale cobalt powder - the raw material solution used for the preparation of ultra-fine cobalt carbonate powder is: CoCl 2 The solution contains Co 2+ 82g / l, NH 4 ·HCO 3 The concentration is 25wt%, the reaction synthesis temperature is 30°C, PH=7.4, the speed of adding to the reactor: CoCl 2 Solution 30L / min, NH 4 ·HCO 3 The solution is 100L / min; the stirring speed is 600r / min, and the aging time is 1.0 hour; the preparation device adopts the special device disclosed by CN1686828A, and the prepared CoCO 3 Powder, its main chemical composition: Ee, Cu, Mn, Ni, Pb, Zn, Ca, Mg, Cl - The impurity contents are all ≤0.01%, Co≤50%, H 2 O≤0.2%, average particle size≤0.1 μm; (2) thermal reduction The superfine cobalt carbonate powder prepared in step (1) is placed in the superfine cobalt carbonate powder thermal reduction electric furnace of the present invention described above for thermal reduction , the specific operation process is as follows:...

Embodiment 2

[0018] CoCl 2 The solution concentration contains Co 2+ 150g / l, reaction synthesis temperature 45°C, PH=7.2, adding reactor speed: CoCl 2 Solution 90L / min, NH 4 ·HCO 3 The saturated solution is 300L / min; the stirring speed is 8000r / min, and the aging time is 1.5 hours; the thermal reduction temperature of the ultrafine cobalt carbonate powder is 400°C, and the others are the same as in Example 1. Can continuously prepare specific surface area ≥ 40m 2 / g spherical or quasi-spherical nano-scale high-energy cobalt powder with an average particle size of 30-50nm and an oxygen content of ≤0.2%.

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Abstract

The invention discloses a nanometer super fine cobalt powder preparing method and device, which comprises the following steps: (1)solution strength of CoCl2 is 70-120g / l; NH4 HCO3 liquor is saturation density; the reaction temperature is at 25-50deg, c; pH=7.2-7.5; adding in reactor speed of CoCl2 is 20-100L / min; NH4 HCO3 fat solution is 60-400L / min; the ageing time is 0.5-2.0 hour;(2) the nanometer super fine cobalt powder thermal reduction can use hydrogen to deacidize or heat decomposition in high-temperature electric resistance furnace at 300-500deg C. The intermediate section and front end of feed head of high-temperature electric resistance furnace jamb installs exhaust stabilivolt guide and mechanical pulling-boat-machine; the furnace body heating device installs independently in 5 to 8 sections; the oven tail installs two to three sections of double layer hydrocooling device and checking-valve and micromanometer. The invention has short process, which reduces the cost.

Description

technical field [0001] The invention relates to a preparation method and equipment of ultrafine cobalt powder, in particular to a preparation method and equipment of nanoscale ultrafine cobalt powder. Background technique [0002] When the cobalt powder particles are small to or close to the nanometer size, its huge specific surface area and superior chemical properties are used in high-power high-energy batteries, ultra-fine high-strength hard alloys, catalysts and other major quality indicators, showing a series of excellent physical and chemical properties. Therefore, the preparation of nano-scale cobalt powder materials has become a common goal pursued by the technology industry today. [0003] The cobalt powder materials currently used in large quantities in the industry are all made of traditional cobalt oxalate as a precursor and reduced by traditional high-temperature electric furnaces. The main problems of the obtained powders are uneven dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/16
Inventor 蔡传算蔡道松
Owner 湖南鼎伦新材料有限公司
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