High-salt iron phosphate liquid waste zero-emission treatment device and method

Abstract

The invention discloses a high-salt iron phosphate liquid waste zero-emission treatment device. The device structurally comprises a pre-treatment (PT) system, a reverse osmosis (RO) treatment system and an evaporative crystallization (VC) treatment system. The high-salt iron phosphate liquid waste zero-emission treatment device has the advantages as follows: the device is designed for high salt of the high-salt iron phosphate liquid waste, the high-salt iron phosphate liquid waste is subjected to pre-treatment to remove part of suspended solids and is subjected to reverse osmosis desalination, concentration reduction and reverse osmosis producing water recycling, reverse osmosis concentrated water is subjected to evaporative crystallization treatment finally, condensate water produced through evaporative crystallization is recycled, waste salt is conveyed outwards, and the purpose of zero liquid emission is achieved. The high-salt iron phosphate liquid waste zero-emission treatment device has the specific advantages as follows: pre-treatment, reverse osmosis and evaporative crystallization are organically combined; 2, the reverse osmosis is adopted for concentration reduction, so that the cost of follow-up evaporative crystallization is reduced; 3, an evaporative crystallization technology combining falling film evaporation and MVR (mechanical vapor recompression) is adopted, energy is saved, the efficiency is high, and the operation cost is reduced; 4, the purposes of water recycling and zero liquid emission are achieved.

Description

technical field [0001] The invention relates to an iron phosphate high-salt waste liquid zero-discharge treatment device and a method thereof, and belongs to the technical field of industrial wastewater treatment. Background technique [0002] Iron phosphate is an ideal precursor material for lithium-ion battery cathode materials. During the production of iron phosphate, a large amount of iron phosphate wastewater will be produced. It contains heavy metals, nitrogen, phosphorus, and other inorganic salts, which will seriously pollute the environment. In the past few years, due to The project is small, and the lime method can be directly used to precipitate heavy metals, generate a large amount of sludge, and waste the useful nitrogen and phosphorus elements in the water. At present, with the expansion of the production scale of iron phosphate, the original iron phosphate wastewater treatment method can no longer meet the actual situation. Necessary, we are discussing the use...

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Problems solved by technology

The TDS of iron phosphate high-salt waste liquid before treatment is 30000-70000mg/L, and the TDS of effluent after treatment is 60-140mg/

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