Production process and production device of power battery cathode ternary oxide

Abstract

The invention discloses a production process and production device of power battery cathode ternary oxide. The production process comprises the following steps: respectively conveying a nickel chloride solution, a cobalt chloride solution and a manganese chloride solution into a stirring tank for mixing through a metering pump to obtain a mixture firstly, then conveying the mixture into a pre-concentrator through a fine filter for heat exchange with furnace gas from roasting furnace, then putting into the roasting furnace for combustion heating so as to decompose the mixture into ternary oxide solids and hydrogen chloride gas, recycling ternary oxide solid particles in the form of powder, cooling the gas first, then carrying out two-stage absorption to form regenerated hydrochloric acid, and carrying out subsequent processing treatment on the recycled ternary oxide, wherein the whole production process is controlled by an independent PLC system. The production process disclosed by the invention is short in flow and stable in technological process, cannot block a material feeding pipeline, and is low in cost; furthermore, a product cannot cause secondary pollution to the environment; the product quality is high; moreover, mixed waste liquid is used as a raw material for preparation, so that energy conservation and consumption reduction can be realized, and the effect of low-carbon discharge is achieved.

Description

technical field [0001] The invention relates to the technical field of power battery preparation, in particular to a method for preparing positive-stage ternary oxides and Process and equipment for recovering hydrochloric acid. Background technique [0002] During the preparation of nickel chloride, cobalt chloride, and manganese chloride solutions, a certain concentration of hydrogen chloride and 100g / L-140g / L nickel, cobalt, and manganese compounds 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, cobalt, and manganese in the hydrogen chloride should be extracted, and the concentration of the acid solution should be reduced at the same time. This requires a set of processes and equipment for preparing battery-grade ternary oxide products and recovering hydrochloric acid. The hydroge...

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Problems solved by technology

[0004] 1) The existing production process adopts chemical wet synthesis, 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) During the crystallization process of ternary (nickel chloride, cobalt chloride, manganese chloride), the compactness cannot meet the high voltage required by the battery;

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

[0008] 5) After the crystallization process of the mixed solution (nickel chloride, cobalt chloride, manganese chloride), the open steam heating cleaning method will be used, and a large amount of ammonia nitrogen wastewater will be generated after cleaning, which will cause great pollution to the environment;

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

[0013] (1) Some process parameters are not suitable for the preparation of battery-grade ternary oxides. For example, the negative pressure on the top of the roaster is controlled at 280MPa, which is impossible;

[0014] (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;

[0015] (3) The purpose of fully mixing the three chloride solutions cannot be met;

[0016] (4) The nozzle is easily blocked by crystals during the atomization process

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