SU1699931A1 - Method of producing cobalt (ii) oxide - Google Patents

Abstract

This invention relates to chemistry and produces high-quality cobalt oxide by co-thermal reduction of cobalt nitrous oxide CoS04 under vibration conditions with acceleration of vibrations of 2 K 4 and two-stage heating at 600-650 ° C and 750-800 ° C. In this case, in the first heating stage, the vibration is carried out intermittently for 1-5 minutes after 10-15 minutes. 3 tab.

Description

The invention relates to chemical technology, in particular to a technology for producing cobalt oxide used in the manufacture of cobalt salts, for example cobalt sulphate.

The aim of the invention is to improve the quality of the product and intensify the process.

PRI me R. 30 kg of cobalt nitrous oxide (CosSM), crushed to 1 mm particles, and 0.75 kg of carbon black (or activated carbon) are loaded into a retort container of 320 mm and a height of 1000 mm, made of steel Х18Н10Т. The retort is closed with a lid. Removal of gases from the retort through the diverter tube through a water seal (trap).

The retort is placed in a basket passing through the shaft furnace and attached to the vibrating plate, and secured with a special fixing mechanism. The temperature is controlled in the product layer.

The heat is turned on, the dial is set at a temperature of 600 ° C. Vibration with a frequency of 20 Hz, acceleration of 4 g is switched on, periodically turning on the vibrator through a timer (switching on period 5 min, pause 15 min). When the layer is heated to 600 ° C, the reaction starts, as evidenced by self-heating

the mixture to 650 ° C and rapid gassing, which after 30-40 minutes decays.

At this time, the temperature setting device is set to a temperature of 800 ° C, and the timer is turned off, and further layer nagoses are maintained with continuous vibration. Gas evolution is resumed (but less intense). When the layer reaches 800 ° C, the thermal regime in the furnace is automatically controlled by switching on (turning off electric heaters). The temperature in the layer is maintained within 780-800 ° C

Heat treatment is carried out until the end of the gas evolution (which is 2 hours after the start of the reaction), after which the vibration and heat are turned off, the discharge branch is blocked. The retort container is pulled out of the shaft furnace and cooled to room temperature, after which the contents are discharged.

The final product is cobalt oxide, the content of CoO is 99-99.5%.

The contents of the trap with the water through which the gases pass are fed to a suction filter, the precipitate is squeezed and dried in a shelf dryer, after which it is weighed. Weight of product carried with gases

cl

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 300 g (1% of the load). The product is returned to the head of the process, attached to the next boot in the retort.

The parameters of the method are presented in table 1-3 (loading weight 2 kg).

Acceleration of vibration K 2 corresponds to the transition of a layer of dispersed material to a suspended state corresponding to the optimum mode of mixing. Three K 4 vibropathing occurs, in which particles are removed from; along with flue gases. When the layer is heated to a temperature of 800 ° C, the reduction reaction proceeds to the end. At a temperature of less than 650 ° C, recovery is not complete. An increase in temperature (more than 800 ° C) is impractical because of the increase in energy consumption without additional effect. In the second stage of the Nagrava, the gassing is not intense, and to maintain its stability, the vibro-liquefaction is carried out continuously.

The influence of the vibration frequency on the quality of the cobalt recording obtained and the acceleration intensification of the process are presented in Table 2.

The duration of active periods of 1-5 minutes corresponds to the time during which the temperature in the entire volume of the layer is equalized and sufficient mixing of the reagent mixture occurs, which leads to an increase in gas evolution.

depends on the volume of downloads and the acceleration of vibration and is found experimentally. So, for a load of 2 kg and, the time for which the outgassing is renewed (increased) is 1 minute, for the load of 30 kg it is about 5 minutes. The pause time of 10–15 min corresponds to a stable gassing in the stationary layer after vibration exposure and is also found experimentally. With a duration of pauses of more than 10-15 minutes, gas evolution dies out.

In the known method of producing cobalt oxide, which involves the thermal thermal reduction of cobalt oxide to COO, a high content of Co + 3 in the final product (80%) and a large gassing time (8 hours).

Claims (1)

Claims method of producing cobalt nitrous oxide CoO by coal thermal reduction of cobalt oxide, characterized in that, in order to increase the content of the main substance in the product and intensify the process, a mixture of zinc hydroxide cobalt oxide and carbon is heated to 600-650 ° C and vibro-liquefaction with acceleration of K, under condition 4 for 1-5 minutes with an interruption of 10-15 minutes until gas evolution stops, and then heated to 780-800 ° C with continuous vibro-liquefaction. 2 SP with about with so Table 3  Loading kg, retort diameter 329 mm