Battery industry ultrapure water, including storage battery production with pure water, lithium battery production with pure water
Solar battery production with pure water, storage battery grid plate with pure water. Battery electrolyte is equipped with pure water requirements are very strict,
Often require the conductivity of water in 0.1us/cm (resistance value of 10 megohms) or more, traditionally used to prepare ultra-pure water for batteries is often used in the process of cathodic and anodic resin exchange equipment, the disadvantage of this process is that the resin is used for a period of time to be often regenerated. With the continuous maturation of membrane separation technology, now often use reverse osmosis filtration process, or the use of a reverse osmosis followed by ion exchange mixed bed (or electrodeionization EDI) process to produce ultrapure water. Preparation of ultrapure water for the battery industry, the battery industry process of preparing ultrapure water is divided into the following categories:
1, the battery industry ultrapure water equipment using ion exchange, the process is as follows:
Raw water → raw water pressurized pump → multi-media filter → activated carbon filter → water softener → precision filters → cationic resin filtration bed → anionic resin filtration bed → anionic and cationic resin mixer → microporous filter → water point
The water is used to produce ultrapure water in the battery industry. Microporous filter → water point
2, battery industry ultrapure water equipment using two-stage reverse osmosis, the process is as follows:
Raw water → raw water pressurization pump → multi-media filter → activated carbon filter → water softener → precision filter → the first stage of reverse osmosis
→ PH adjustment → intermediate tank → the second stage of reverse osmosis (reverse osmosis membrane surface with a positive charge) → the purified water tank → purified water pump → microporous filter → water point
3, the battery industry ultrapure water equipment using EDI, the process is as follows:
Raw water → raw water pressurization pump → multi-media filter → activated carbon filter → water softener → precision filter → first stage of reverse osmosis machine → intermediate tank → intermediate water pump → EDI system → microporous filter → water point three kinds of preparation of chemical industry ultrapure water Comparison of the current process for the preparation of ultrapure water for the chemical industry is basically the above three processes, the rest of the process is mostly in the above three basic processes on the basis of different combinations with the derivatives. Now their advantages and disadvantages are listed below:
1, the first using ion exchange resins, the advantages of its initial investment is less, occupy less space, but the disadvantage is the need to regenerate the ion, consume a lot of acid and alkali, and the environment has a certain degree of destructiveness.
2, the second two-stage reverse osmosis equipment, which is characterized by the initial investment than the use of ion exchange resin is higher, but no resin regeneration. The disadvantage is that the membrane needs regular cleaning or replacement, water quality is relatively not too high, most of them can only do 1us/cm or so, so in the quality of the requirements of the higher often use a reverse osmosis behind the mixed bed (yin and yang compound bed) gatekeeper.
3, the third type of reverse osmosis as a pretreatment with electrodeionization (EDI) device, which is currently the most economical and environmentally friendly ultra-pure water preparation process, do not need to regenerate the acid and alkali can be used to continuously produce ultra-pure water, there is nothing destructive to the environment. The disadvantage is that the initial investment is too expensive compared to the above two ways. Our company produces the battery ultrapure water equipment characteristics of ultrapure water traditional preparation process is usually used in the preparation of ion exchange resin, but the use of ion exchange resin usually need to regularly regenerate the resin, that is, the cost of material resources and waste of manpower, our company after years of practice, combined with the latest membrane separation technology, often used in reverse osmosis plus ion exchange system (or EDI) used in the combination of preparation of ultrapure water, the process compared with the traditional process. Compared with the traditional process, this process has the advantages of low operation cost (the regeneration cycle of ion exchanger is greatly extended) and reliable operation. Compared with the latest process, it has the advantages of low cost and easy availability of consumables. Reverse osmosis process technology is advanced and reliable.