What are the reasons for the high levels of iron, calcium, and magnesium in hydrochloric acid?
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This post was last edited by sunjl1981 on 2013-1-6 at 22:23. Our factory’s synthesis furnace uses a graphite furnace, and the water used for absorption is pure water. The pipes for the absorption water, as well as those for the circulating acid and hydrogen chloride, are all non-metallic; only the hydrogen gas pipes are made of carbon steel. The intermediate tanks and storage tanks for hydrochloric acid are also non-metallic. Yet, the salt analysis results show high levels of iron, as well as calcium and magnesium. Could someone help analyze what might be causing this? ! ! # + + .
Damage to the lining of equipment, pipes, and valves.
First, check and confirm that the absorbed water (pure water) meets the production requirements； If high levels of iron, as well as calcium and magnesium, are observed at the beginning of operation of the plant, it is necessary to check whether the system has been thoroughly cleaned. The main equipment that needs to be inspected includes the synthesis furnace, coolers, exhaust gas absorption towers, hydrochloric acid intermediate tanks, hydrochloric acid storage tanks, and the corresponding pipelines; it is also important to ensure that gaskets made of materials with low calcium and magnesium content are used in all areas ； If high levels of iron, as well as high levels of calcium and magnesium, occur after the installation has been operating normally for some time, it is necessary to check whether the linings of the equipment, pipes, and valves are damaged ； If the absorbed water (pure water) meets the production requirements, dilute hydrochloric acid is taken from the exhaust gas absorption tower, hydrochloric acid is taken from the outlet of the absorption section, hydrochloric acid is taken from the intermediate hydrochloric acid tank, and hydrochloric acid is taken from the hydrochloric acid storage tank to have various parameters tested in sequence. Once any abnormalities are detected, targeted inspections and repairs are carried out.
This post was last edited by Oath-taking on 2011-10-5 10:18. Is your hydrochloric acid storage tank made of low-calcium-magnesium fiberglass? Theoretically, there is no problem, but in practice it’s difficult to meet the low calcium and magnesium requirements, which results in excessive levels of calcium and magnesium. If this is the reason, it is recommended to change the storage tank to PE. The iron content is likely due to a pipeline issue.
Possible reasons: 1. There is a leakage of circulating water in the absorption section； 2. Some non-metallic pipes need to be cleaned at the beginning of driving ； 3. The storage tank has a long storage time. It is recommended to first check the system’s online sampling to determine if the levels are high, and then analyze the storage tank to identify the source of the problem.
Are the hydrochloric acid intermediate tanks and storage tanks made of fiberglass-reinforced plastic? If it is made of fiberglass, is low-calcium magnesium used?
What was said upstairs: “3. The storage tank has a long storage time.” ” I’m a bit confused
Thank you all for your suggestions. We will continue to follow up and verify the situation, and we’ll share the results here later!
Hydrochloric acid stays in the storage tank for some time – what causes an increase in calcium, magnesium, and iron levels? This issue has also occurred in our factory
1. Is there acid sludge in the chlorine system? 2. Whether there is internal leakage in the synthesis furnace and absorber. 3. Is there a problem with the high-purity water system? 4. Whether there is much water in the hydrogen gas, and whether the hydrogen pipeline has been purged. 5. How frequently is the furnace ignited?
1. High metal levels may be caused by the acid hydrochloric acid being left in contact with the material for too long, but I don’t think this is likely, unless there is corrosion in the equipment. 2. I think you can take samples in stages for analysis, in order to identify where the problem lies, and then conduct further inspections of the equipment and materials. 3. Could it be due to some form of human contamination, or issues with the laboratory’s analysis methods?