Device for preparing cobaltosic oxide powder by spray roasting

Abstract

This invention relates to the preparation of tri-cobalt tetroxide and recovery of hydrochloric acid. The production equipment comprises: a waste-acid tank, a filter, a preconcentrator, a pneumatic regulating valve, roasting furnace and its top spraying device, combustion means, means for breaking blocks at the bottom of the furnace, a rotating valve, pneumatic powder conveying device, absorption tower, fan for pumping smoke, 1st, 2nd and 3rd washing tower, water supply, hydrochloric acid storage and conveying pipe, gas / liquid separator, waste gas fan, dust-remover, chimney; and newly equiped;a dust-extractor, a pneumatic feeder, on-line cleaning device, combustion-aid device, back-blow flow-aid device, chlorine-remover, air-purifier, secondary absorption tower. Advantages are: stable reaction temperature, increased utilization rate of the roasting furnace, no environmental pollution.

Description

technical field [0001] The invention relates to the technical field of preparing cobalt tetroxide and recovering hydrochloric acid, in particular to equipment for preparing cobalt tetroxide powder by spray roasting. Background technique [0002] During the preparation of cobalt oxide, a certain concentration of HCl and 140g / L cobalt compound will be produced. During the preparation process, the proportion of HCl will be gradually increased, and the dissolution will stop when the saturated state is reached. In order to keep the dissolution process going on, the cobalt oxide in the HCl should be extracted, and the concentration of the acid solution should be reduced at the same time. A set of preparation process and equipment is required to send the HCl solution containing the above ratio to the preparation device to generate tricobalt tetroxide. Hydrochloric acid with a concentration of about 15% is also obtained, which is returned to the dissolution system to reuse the wast...

AI Technical Summary

Problems solved by technology

[0008] 1. The roasting furnace is equipped with a furnace top temperature control device, which can only control the temperature of the furnace top, but does not control the temperature of the combustion chamber, which plays a key role in the regeneration process;

[0009] 2. The flow in the roasting furnace is not smooth, resulting in low roasting efficiency;

[0010] 3. The ordinary steel Q235B steel used in the furnace body of the roasting furnace is easy to oxidize, so it will pollute the charge;

[0012] 5. The waste acid pump used for the pre-concentrator is fed through the waste acid filter, and the waste acid pump is susceptible to mechanical wear and corrosion, resulting in fluctuations in flow and pressure;

[0013] 6. The feeding pipeline of the roaster will form crystals on the tube wall during the working process, which must be cleaned regularly. This kind of pipeline cleaning and maintenance is very difficult and the workload is heavy. The pipeline must be disassembled and cleaned manually, which is time-consuming , cost material

Images