Zero-discharge treatment device and method for ferric phosphate high-salt waste liquid

Abstract

The invention is a zero-discharge treatment device for ferric phosphate high-salt waste liquid, and its structure includes a pretreatment system (PT), a reverse osmosis treatment system (RO), and an evaporation crystallization treatment system (VC). Advantages, the present invention is designed for the high salinity of ferric phosphate high-salt waste liquid. The ferric phosphate high-salt waste liquid is firstly treated to remove part of the suspended matter, and then desalted by reverse osmosis, concentrated and reduced, and the water produced by reverse osmosis is reused , The reverse osmosis concentrated water is finally treated by evaporation and crystallization, the condensed water from evaporation and crystallization is reused, and the waste salt is transported outside to achieve the purpose of zero liquid discharge. The specific advantages are: ① organically combine pretreatment, reverse osmosis, and evaporation crystallization; ② use reverse osmosis to concentrate and reduce weight, and reduce the cost of subsequent evaporation crystallization; ③ use falling film evaporation combined with MVR (steam mechanical recompression) Advanced evaporation and crystallization technology, energy-saving and high-efficiency, reducing operating costs ④ It not only achieves water reuse, but also achieves the purpose of zero liquid discharge.

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...

AI Technical Summary

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 / L, and the removal rate reaches 99.8%. Reuse water according to the requirements of water to achieve the purpose of zero liquid discharge

Images