Equipment for preparing nickel oxide product from nickel chloride solution and recovering hydrochloric acid

Abstract

The invention relates to the technical field of preparing nickel oxide and recovering hydrochloric acid, and in particular relates to equipment for preparing nickel oxide and recovering hydrochloric acid by using nickel chloride solution. The equipment comprises a nickel chloride solution tank for collecting waste acid, a waste acid filter, a pre-concentrator, a roasting furnace, a furnace top sprinkler, a burner in tangent arrangement, a rotary horizontal stirrer, a crusher, a rotary valve, a nickel oxide powder pneumatic conveying and collecting system, a first-stage absorbing tower, a second-stage absorbing tower, a smoke exhaust fan, a washing tower, a feed pump sealing, cooling water circulating and water supplying device, a pyrolysis acid storage tank, a conveying pipeline, a gas-liquid separator, a chimney, a dust arrester, a pneumatic feeding device, a feeding pipeline online cleaning device, a combustion-supporting heating device, a back flushing flow assisting device, a chlorine remover and an air purifier. The equipment has the advantages that the adjustable range of the reaction temperature of the roasting furnace is expanded, waste gases reach an emission standard, the equipment utilization ratio of the roasting furnace is improved, and the environmental pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of preparing nickel oxide and recovering hydrochloric acid, in particular to a device for preparing nickel oxide products and recovering hydrochloric acid by utilizing a nickel chloride solution. Background technique [0002] During the preparation of nickel chloride, a certain concentration of hydrogen chloride and nickel compounds of 100g / L-140g / L will be produced. During the preparation process, the proportion of hydrogen chloride will gradually decrease, and when it reaches saturation, the dissolution will stop. In order to keep the dissolution process going on, the nickel chloride in the hydrogen chloride should be extracted and the concentration of the acid solution should be reduced at the same time. This just requires a set of process and equipment for preparing nickel oxide or nickelous oxide and recovering hydrochloric acid, sending the HCl solution containing the above ratio to the preparation de...

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Problems solved by technology

[0004] 1) The existing production process adopts the chemical synthesis method, the production process is long and the cost is high;

[0005] 2) The chlorine-containing waste gas produced in the preparation process needs to be neutralized with alkali, and the sodium hypochlorite produced after neutralization causes secondary pollution to the environment;

[0006] 3) in the crystallization process of nickel chloride, the particle size uniformity cannot be guaranteed to reach more than 85%;

[0007] 4) Due to the generation of chloride ions in the original production process, the equipment of the unit is corroded;

[0008] 5) The open steam heating method is adopted in the crystallization process of nickel chloride, which causes great pollution to the air and the environment;

[0009] 6) The feeding pipeline will form crystals in the pipeline during the working process, causing the pipeline to be blocked. The pipeline must be cleaned regularly. The cleaning and maintenance work is very difficult and the workload is heavy. The pipeline must be disassembled and cleaned manually, which is time-consuming and expensive. , laborious

[0025] 2) Unreasonable discharge method of furnace bottom oxide

The original discharge method is to rely on air back blowing and natural fall of materials. This method is not suitable for the production of non-ferrous metal oxides, because the reaction temperature of non-ferrous metal oxides is very high. The impact of shape, viscosity, etc., can easily cause the outlet to be blocked, and mechanical methods must be used to fundamentally solve this problem;

[0026] 3) The method of preventing the cyclone separator from hanging on the wall and blocking the material is unreasonable. The original discharge is completed by a vibrator installed at the bottom of the cyclone separator. This method not only cannot solve the blockage, but aggravates the blockage. This is due to the low specific gravity and small particle size of the oxide in the cyclone separator;

[0027] 4) The water supply point of the water circulation system cannot achieve circulation

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