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Method for preparing cobaltosic oxide by calcinating cobalt oxalate with microwave

A technology of cobalt tetroxide and cobalt oxalate, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of uneven product composition and particle size, high production cost, complex equipment structure, etc., and achieve uniform product composition and particle size, suitable for industrial production, Solve the effect of high energy consumption

Inactive Publication Date: 2011-07-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN101066781 provides that the three-stage calcination process of cobalt tetroxide for lithium ion preparation by calcining cobalt salt takes up to more than 8 hours; uniform
However, since the equipment used in this method is a vertical heating furnace, there are disadvantages such as complex equipment structure and relatively high production cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Cobalt oxalate with a particle size of 100-250 μm obtained through crystallization and precipitation during the cobalt wet extraction process was dried until the water content was less than 5 wt%, and placed in the microwave rotary kiln silo, and the feed screw speed was adjusted to 3 rpm. The material is continuously conveyed to the composite microwave heating tube of the microwave rotary kiln with an inclination angle of 5° through the feeding screw, the microwave heating switch is turned on, the microwave output power is adjusted to 10-15kW, the rotary kiln speed is adjusted to 2 rpm, and the silicon carbide section The material is heated from room temperature to 500-530°C at a rate of 20°C / min, so that the partially decomposed material in the silicon carbide section is transported to the microwave-specific ceramic section with axial rib diameter, and the residence time of the material in the rotary kiln is controlled as After 35 minutes, the cobalt tetraox...

Embodiment 2

[0019] Example 2: The feed screw speed is 6 rpm, the microwave output power is adjusted to 40-45kW, the temperature of the silicon carbide section material is raised from room temperature to 530-560 °C at a rate of 50 °C / min, and the rotary kiln speed is adjusted to 5 rpm , so that the partially decomposed material in the silicon carbide section is transported to the special microwave ceramic section with axial rib diameter, and the residence time of the material in the rotary kiln is controlled to be 20 minutes. After being fully reacted by the microwave special ceramic section, it enters the recovery system, and the Cobalt Tetroxide Products. After analysis and testing, the cobalt content in the tricobalt tetroxide product is 73.0%, and the average particle size is 3-8 μm.

Embodiment 3

[0020] Example 3: The feed screw speed is 9 rpm, the microwave output power is adjusted to 70-75kW, the temperature of the silicon carbide section material is raised from room temperature to 560-600 °C at a rate of 80 °C / min, and the rotary kiln speed is 8 rpm, The material that has been partially decomposed in the silicon carbide section is transported to the special microwave ceramic section with axial rib diameter, and the residence time of the material in the rotary kiln is controlled to be 10 minutes. product. After analysis and testing, the cobalt content in the tricobalt tetroxide product is 72.8%, and the average particle size is 1-7 μm.

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Abstract

The present invention relates to a method for preparing cobaltosic oxide by calcinating cobalt oxalate with microwave. A hearth of a microwave rotary kiln adopts a composite microwave heating pipe, and the high wave absorbing property of silicon carbide is utilized to perform auxiliary heating, so that the cobalt oxalate is decomposed partially in a silicon carbide section, and then materials decomposed partially pass through a special microwave ceramic section with high wave-transmitting performance to accelerate the temperature rate of the cobalt oxalate and continue to calcine the cobalt oxalate for decomposition, so that the defects of high energy consumption, long production period and the like in the conventional calcining method are overcome, and the microwave calcination of weak wave absorbing substances is realized. The method realizes the continuous and large-scale calcination of the cobalt oxalate, and the granularity and the cobalt content of the cobalt oxalate products, namely cobaltosic oxide reach the YS / T256-2000 standard.

Description

technical field [0001] The invention relates to a method for producing fine cobalt tetroxide by microwave calcining cobalt oxalate. It belongs to the technical field of material preparation. Background technique [0002] Cobalt tetroxide is a spinel-type transition metal oxide, Co 3+ Occupying the octahedral position, the theoretical cobalt content is 73.43%, the oxygen content is 26.57%, and the density is 6.0-6.2g / cm 3 , is an excellent functional material, which is widely used in thermal and pressure sensitive electrodes, gas sensors, magnetic materials and lithium ion battery cathode materials and other fields. In recent years, with the rapid development of my country's communications and electronic information industries, the demand for lithium-ion secondary batteries continues to grow. At present, cobalt tetroxide is in short supply. It is estimated that my country's demand for lithium-ion batteries will maintain a growth rate of about 10% in the next 10 years. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04
Inventor 彭金辉刘秉国张利波夏洪应张泽彪郭胜惠张世敏
Owner KUNMING UNIV OF SCI & TECH
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