Phosphoric acid purification device

Abstract

The invention discloses a phosphoric acid purification device utilizing ion exchange membranes for purifying phosphoric acid, which can obtain the high-purity phosphoric acid. The phosphoric acid purification device comprises an electrodialysis device, wherein an anode and a cathode are arranged in the electrodialysis device, a cation exchange membrane and an anion exchange membrane are arranged between the anode and the cathode, an intermediate chamber is formed between the cation exchange membrane and the anion exchange membrane, the cation exchange membrane is near to the cathode, a cathode chamber is formed between the cation exchange membrane and the cathode, the anion exchange membrane is near to the anode, and an anode chamber is formed between the anion exchange membrane and the anode. That is the anode, the anion exchange membrane, the cation exchange membrane and the cathode are sequentially arranged in the electrodialysis device, thereby leading the device to effectively remove the impurities of anions and cations while leading the anions and the cations to pass, further improving the purification effect to the phosphoric acid and being applicable to popularization in the preparation of the food-grade phosphoric acid.

Description

technical field [0001] The invention relates to a device for purifying phosphoric acid, in particular to a phosphoric acid purification device for preparing phosphoric acid with an ion exchange membrane. Background technique [0002] At present, the preparation methods of phosphoric acid mainly include wet method and thermal method. Due to the high impurity content of wet method phosphoric acid, most of them can only be used to manufacture low-grade phosphate products such as phosphate fertilizers, food grade and electronic grade phosphoric acid and fine phosphate The product is mainly prepared by thermal acid, but compared with wet acid, thermal acid consumes more energy and has higher production costs, so researchers try to use various methods to purify wet phosphoric acid, and use this as raw material to produce Production of low cost fine phosphate products. At present, the purification methods of wet process phosphoric acid mainly include crystallization method, ion ex...

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Problems solved by technology

[0009] The purification mechanism of the two is the same, so the Japanese patent JP53096994 still has the defect that the purity of the obtained product acid is not high (especially the high content of anion impurities), and only products equivalent to industrial grade phosphoric acid can be obtained

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