E oil water separation
Most of the oily sewage from ships is floating oil, and there are fine suspended solids under the oil layer and on the water surface, forming a layer of oil pollution on the surface of the sewage. At present, in addition to using methods such as precipitation, filtration or adsorption, electrocoagulation is also used at home and abroad. The anodes used include aluminum, iron or graphite, etc. These electrodes are all soluble anodes, which are constantly consumed and replaced during the electrolysis process, and the scum also needs to be disposed of. Therefore, a titanium-based lead dioxide anode is used, stainless steel is used as the cathode material, the current density is 150A/㎡, the pole spacing is 10mm, the operating voltage is 5~7V, and the oil content is 1000
After 20 minutes of electrolysis of the sewage above ×10-6, the degreasing rate reaches 95%. If the pH value of the oily sewage is adjusted to be greater than 8, the oil removal rate can reach more than 99%, and the oil content in the water can be reduced to within the range of the discharge standard.
F seawater electrolysis produces hypochlorite
Shandong Weihai Power Plant uses seawater as the circulating water of the condenser. A large number of mussels (or sea rainbow, commonly known as mussels) are often formed in the pipes to clog the pipes and cause serious accidents. Bleach powder has been used to treat seawater before, but with poor results. In 1976, the electrolytic chlorine production method was used, so that the seawater containing chlorine and hypochlorite continuously entered the circulating water pipe, so as to achieve the purpose of killing mussels. The electrolytic current density is 10A/dm', the cell voltage is about 5V, the flow rate of seawater between electrodes is 11.1cm/s, the current efficiency is equal to 68%, and the obtained active chlorine is 0.8~1mg/L. The anode is a ceramic tube lead dioxide electrode, the cathode is a steel tube, and the electrode spacing is 9mm.
G Regeneration of galvanized passivation waste liquid
The Shanghai Institute of Environmental Protection adopts the diaphragm electrolysis method to regenerate the galvanized passivation waste liquid. The anode material adopts titanium mesh lead dioxide electrode, which has good effect and low corrosion rate.
H brine electrolysis
Compared with DSA, the chlorine evolution potential measured in saturated saline is the same when ia=5A/dm2 or less; at 15A/dm2, it is only 0.18V higher at 70°C. The oxygen content in chlorine gas is less than 1% lower than that of DSA. Compared with the two electrodes, the lead dioxide electrode consumes more power. The life test was carried out in saturated salt water, ia=15A/dm2, the working life was more than 217 days, and no lead was found to dissolve. It is generally believed that it can be used in the chlor-alkali electrolysis industry.
I Electrolytic oxidation for the production of halide salts
As we all know, it can be used in the production of chlorate and perchlorate; it is also very good in the manufacture of bromate, and colorless pure crystals can be obtained; it can also be used in periodate and chromate, more It is even better to use platinum electrodes.
J Electrolytic treatment of wastewater
At the beginning, it was used in electrolytic oxidation treatment of various inorganic and organic wastewater processes. In addition to being used as an insoluble anode in electrodialysis technology, it can also be used for special purposes in organic electrolytic synthesis by utilizing the unique electrode surface effect of lead dioxide electrodes. .
K For cathodic corrosion protection
In the cathodic anticorrosion of ships or steel structures in seawater and mud, lead dioxide electrodes have good corrosion resistance, low price, and can be widely used.
L is used in electro-organic synthesis
a Synthesis of hydroquinone and benzoquinone
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Nicole
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