Method for preparing cobalt-nickel metal or alloy powder by solution nebulization method

Abstract

The invention discloses a method for preparing cobalt-nickel metal or alloy powder by a solution nebulization method, which comprises the following steps of: preparing 0.1 to 3.0 mol / L solution from soluble cobalt salts or nickel salts or the mixture of the cobalt salts and the nickel salts, and adding the solution into an organic solvent soluble mutually with water for uniform mixing; introducing the solution into an airflow nebulizer in a special solution nebulization device, nebulizing the solution under the nebulization pressure of 1.0-2.5*105Pa by using an inert gas, introducing the nebulized solution into a vertical tubular electric furnace through a turbulence device, and performing reaction at the temperature of 750 to 950 DEG C to obtain the cobalt-nickel metal or alloy powder; and performing separation and recovery by using a two-stage high-efficiency retoclone collector and a one-stage cloth screen, and causing a sour gas in a gaseous phase to enter a leaching absorption tower for recycling. In the method, the cobalt-nickel metal or alloy powder with a complete crystal structure and a regular particle shape can be prepared by one step. Compared with the conventional process, the method greatly reduces the preparation cost, ensures a simple process flow, high powder preparation efficiency, high quality of product, an environmentally-friendly process and continuous automatic production, and is simple and convenient to operate.

Description

technical field [0001] The invention relates to the field of powder metallurgy. Specifically, it is a method for preparing nickel-cobalt metal or alloy powder by solution atomization. Background technique [0002] At present, the preparation methods of nickel-cobalt metal and alloy powder mainly include metal melt atomization method, carbonyl method, electrolysis method, thermal decomposition method, reduction method and so on. The metal melt atomization method has high production efficiency, but the prepared powder has the defects of coarse particle size and rod shape, which limits its application; the powder prepared by electrolysis method is generally dendritic or needle-shaped, which is not suitable for preparing spherical powder, and The powder density is low; the CO gas used in the carbonyl method is highly toxic, so it requires high equipment; the thermal decomposition method generally uses high-purity cobalt oxalate and nickel oxalate as raw materials, and uses CO ...

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Problems solved by technology

The metal melt atomization method has high production efficiency, but the prepared powder has the defects of coarse particle size and rod shape, which limits its application; the powder prepared by electrolysis method is generally dendritic or needle-shaped, which is not suitable for preparing spherical powder, and The powder density is low; the CO gas used in the carbonyl method is highly toxic, so it requires high equipment; the thermal decomposition method generally uses high-purity cobalt oxalate and nickel oxalate as raw materials, and uses CO 2 or N 2 The protective gas is decomposed in the heating furnace. Compared with the hydrogen reduction method, the cost of this process is significantly lower, but the production control requirements are relatively strict, and large-scale production cannot be carried out; the use of hydrogen to reduce the oxalate or oxide of nickel and cobalt is more domestic enterprises. The traditional process route adopted, the process cost of this method is high, the actual particle size of the obtained powder is difficult to control accurately, and the microscopic morphology of the powder is mostly irregular and unevenly distributed

At the same time, these preparation methods generally have the disadvantages of long technological process, complicated production process, difficult control of product particle size distribution, low production efficiency and high cost.

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