The 98% pure sulfuric acid, after entering the acid storage tank, appears milky white with low transparency
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This post was last edited by mkp369 on 2017-11-6 at 14:42 {:3_46:} I’m seeking help. Over the past six months, the 98% sulfuric acid produced in my workshop was quite clear at first, with a transparency level of over 120. However, after it was transferred from the acid production tank to the storage area and then sent out for use, its transparency decreased significantly; in recent months it has only had a transparency of 10–20, appearing milky white. Seek technical support. Our company produces sulfuric acid from flue gas from lead smelting, using a 3+2 two-turn two-suction process. The SO2 concentration in the flue gas is around 9.5–10%, and the opening degree of the make-up air valve remains above 30% for extended periods; the operating conditions are not very stable, with production having to be halted for about 5 hours every 7–10 days. Could you please advise on what approaches can be taken to address the issue of transparency in the finished acid, or help point out the direction in which to look.
There are many reasons; it could be that corrosion in the tank has contaminated the acid, or it might be that components in the air have reacted chemically with the acid
May I ask, are you referring to the possible corrosion of the large acid tank, which leads to a decrease in transparency?
Is it caused by the acid sludge in the finished acid tank? Is it a recurring issue or just an occasional occurrence?
The nitrogen oxide content in lead smelting flue gas is relatively high. I guess you’re using a bottom-blown furnace
We would like to inform everyone that we use bottom-blown furnaces for lead smelting, and the flue gases generated in this process are used to produce acid. The acidity currently in production has a fairly good transparency in underground tanks, but it drops sharply once it reaches the large acid storage facilities.
This is related to the type of smelting furnace, and only standard smelting measures can be taken. Use high-quality alloy materials for your acid pipelines; never use cast iron.
This problem is easy to solve: by adding compressed air pipes in the underground channel to blow away the sulfur dioxide dissolved in the acid, the issue can be resolved. Use 15-gauge stainless steel pipes, seal one end of them, and drill holes in the middle using a 2.5-inch drill bit; there’s no need for too many holes – 360 degrees of coverage is sufficient
Yes, that’s exactly what I did. I’ve been doing it for over 2 years now, and everything has been working fine ever since