Extraction separation tank of phosphoric acid purification device

Abstract

The invention discloses an extraction separation tank of a phosphoric acid purification device. The extraction separation tankcomprises a tank body and a tank rake, wherein the upper portion of the tank body is provided with a tank top, the lower portion of the tank body is provided with a tank bottom, the tank bottom is provided with a slag outlet, the tank rake is rotatably provided with a stirring shaft leading into the tank body from the tank top, the stirring shaft is fixedly connected with a stirring paddle at the lower portion in the tank body, an inner cylinder with the upper portion and the lower portion being of an opening structure is arranged in the tank body, the stirring shaft penetrates through the inner cylinder, a flow guide cylinder with the axis vertically arranged is arranged in the inner cylinder, the upper end of the flow guide cylinder is of a sealing structure, the lower end of the flow guide cylinder is of an opening structure, a feeding pipe penetrating out of the upper portion of the tank body or the tank top in a sealed mode is connected to the flow guide cylinder and communicated with the inner space of the flow guide cylinder, an organic phase overflow weir is arranged on the inner cylinder, an acid phase overflow weir is arranged in a space outside the inner cylinder in the tank body, the height of the top of the acid phase overflow weir is lower than that of the top of the organic phase overflow weir, and the lowest positions of the organic phase overflow weir and the acid phase overflow weir are respectively connected with an organic phase discharge pipe and an acid phase discharge pipe which are communicated to the outside of the tank body.

Description

technical field [0001] The invention relates to an extraction and separation tank for a phosphoric acid purification device, belonging to the technical field of extraction equipment for a phosphoric acid purification device. Background technique [0002] The phosphoric acid industry is an important part of the chemical industry and occupies an important position in the national economy. Phosphoric acid can be divided into fertilizer grade, industrial grade, food grade, electronic grade, etc. according to the level and type of impurities in phosphoric acid. The difficulty of impurity removal and purification of products increases step by step. Can be used to produce a variety of fine phosphate products. Wet-process phosphoric acid contains many impurities such as calcium, fluorine, magnesium, iron, etc., and purification treatment is required to produce phosphoric acid and phosphate products above industrial grade. [0003] At present, the industrial production of wet-proce...

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Problems solved by technology

[0006] The extraction and separation tanks of the prior art mostly adopt a single partition and single overflow structure, and there are many problems: 1. When the two phases are separated, only the upper organic phase medium can be overflowed and separated, and the lower residual acid phase medium is directly discharged. The residual acid phase medium is mixed with more organic phase medium; 2. When the partition overflows, it is easy to produce bias flow, resulting in uneven distribution of the overflow medium and unstable overflow; 3. The rake holes of the top cover groove cannot be sealed and are flammable Gas escapes, there is a danger

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