Production of phosphoric acid and multi-trace element potassium dihydrogen phosphate through using waste phosphorus mud

Abstract

The invention relates to a production of phosphoric acid and multi-trace element potassium dihydrogen phosphate through using waste phosphorus mud. A waste leftover of phosphorous products of a yellow phosphorus factory electric furnace, phosphorus mud, is utilized as a raw material, and is combusted in a gasification furnace, the temperature of the gasification furnace is 870-980DEG C, a furnace phosphorus gas which enters the top of a vertical combustion furnace is oxidized by inlet air, and phosphorous is absorbed by water to obtain phosphoric acid; the combustion chamber of the gasification furnace is built by graphite, the outer wall of the gasification furnace is circulatingly cooled by water, and the temperature of the inner wall of the gasification furnace is 200-260DEG C; active carbon is used to adsorb suspended heavy metals in a reactor, and polymeric aluminum chloride is added to precipitate to purify; the obtained phosphoric acid solution which is the upper layer is filtered; refined KOH is used to adjust the pH value to above 8 to precipitate impurities, and the obtained solution is filtered; and refined phosphoric acid is used to adjust the pH value of the obtained phosphoric acid solution to 4.2-4.6, and the obtained solution is concentrated and dried to form finished products. The changing of wastes into valuables allows the pollution of industrial wastes to the environment is reduced, the technology is simplified, and cooling water is recycled.

Description

technical field [0001] The present invention relates to the technical field of phosphorus chemical industry, in particular, using waste phosphorus sludge produced in the process of producing phosphorus products in an electric furnace in a yellow phosphorus factory, producing phosphoric acid, further neutralizing reaction to produce potassium dihydrogen phosphate, and then chelating various trace elements Potassium dihydrogen phosphate is used as a multi-component compound phosphorus and potassium fertilizer. Background technique [0002] At present, there are several common methods for domestic production of potassium dihydrogen phosphate, 1. reaction of phosphoric acid and potassium chloride; 2. reaction of ammonium dihydrogen phosphate and potassium chloride; 3. reaction of sodium dihydrogen phosphate and potassium chloride; 4. reaction of phosphoric acid Reacts with potassium hydroxide. The potassium dihydrogen phosphate produced by the first and second methods is not hi...

AI Technical Summary

Problems solved by technology

The potassium dihydrogen phosphate produced by the first and second methods is not high in purity, contains very high chloride ions, and has high requirements for equipment; a lot of hydrogen chloride gas will be produced in the potassium dihydrogen phosphate produced by the first method, which will affect the environment. create pollution

When the third method is used to produce potassium dihydrogen phosphate, there will be by-product sodium chloride, which is quite troublesome to handle, so for the sake of product quality and environmental requirements, the first, second, and third methods are mostly no longer used; the fourth The first method is the most widely used in China. This method is simple and easy to master, but the fourth method will use a lot of cooling water in production. Water is also a precious and important resource. In order to utilize resources and save resources, for Therefore, this method is a corresponding improvement on the fourth production method

Images