Process for pure water treatment of batteries

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     Battery pure water treatment includes pure water for battery production, pure water for lithium battery production, pure water for solar cell production, and pure water for battery separators. The electrolyte used in batteries has very strict requirements regarding pure water; typically, the conductivity of the water is required to be above 0.1 us/cm (with a resistance value of 10 megohms). The conventional method for purifying water used in batteries involves the use of anion and cation resin exchange systems. However, a drawback of this purification process is that the resins need to be regenerated frequently after being used for a certain period of time. With the continuous advancement of membrane separation technology, reverse osmosis filtration is now commonly used, or a process that involves primary reverse osmosis followed by ion exchange mixed beds (or electrodialysis EDI) is employed to produce ultra-pure water for battery purification. Process flow for producing ultra-pure water used in the battery industry. The processes for purifying water used in batteries can be roughly divided into the following categories: 1. Ion exchange method – the process is as follows: Raw water → Raw water pressure pump → Multi-media filter → Activated carbon filter → Water softener → Precision filter → Cation resin filter bed → Anion resin filter bed → Mixed cation-anion resin bed → Micro-porous filter → Point of use. 2. Two-stage reverse osmosis method – the process is as follows: Raw water → Raw water pressure pump → Multi-media filter → Activated carbon filter → Water softener → Precision filter → First-stage reverse osmosis → pH adjustment → Intermediate water tank → Second-stage reverse osmosis (with positively charged reverse osmosis membrane surface) → Purified water tank → Pure water pump → Micro-porous filter → Point of use. 3. EDI method – the process is as follows: Raw water → Raw water pressure pump → Multi-media filter → Activated carbon filter → Water softener → Precision filter → First-stage reverse osmosis unit → Intermediate water tank → Intermediate water pump → EDI system → Micro-porous filter → Point of use. Last edited by johncom on 2009-3-6 10:01