Why has the discharge pipe of the white cells in our company’s chlorine plant turned slightly red-gray? Thank you all, experts, for your help!
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This post was last edited by sunjl1981 on 2013-1-7 00:10. Why has the discharge pipe of the white cells in our company’s chlorine production plant turned slightly red-gray? Thank you to all the experts for their help. # + + .
The discoloration of the discharge pipe of the white cells in chlorine production plants is usually observed at the saltwater outlet. The specific reasons are as follows: 1. Excessive iron content in the saltwater (originating from anti-caking agents and pipes); 2. Reaction products of the organic sedimentation aid sodium polyacrylate; 3. Failure of the resin trap, allowing broken resin to enter the saltwater circulation system; 4. Substandard acid addition to the saltwater, resulting in excessive iron content; 5. If acid is produced using an iron furnace, broken resin may end up in the acid and then be added to the saltwater
The most likely suspect is an excessive level of Fe ions; find out the reason
1. High iron content, likely originating from vacuum salt production； 2. The aluminum and silicate levels in saltwater are high.
If it is an anode hose, a red color is commonly observed, which may be due to excessive iron ions in the saltwater. If vacuum salt is used, it’s certain that the salt supplier has added a dispersant to the salt; this can be mentioned to the supplier when purchasing the salt ； It’s also possible that the gasketed pipeline for the secondary saline is damaged; check it. If only individual hoses have changed color, check for a membrane leak.
Saltwater contains iron; high-purity acid also contains iron. Countermeasures: Immediately stop adding acid, determine the source of the iron. When the machine is stopped, swap the cathode outlet pipe and the anode outlet pipe; then start the machine again and add acid, while monitoring the situation
That is caused by manganese deposition; resin towers cannot remove manganese ions, and it has little impact on the performance of the electrolyzer. If you’re worried, use original salt instead.
Is it because the anode outlet tube has turned red, resulting in an excess of iron ions?； If acid addition to the anode is stopped for about a week, the inlet pipe will turn red. It should be caused by prolonged excessive iron levels ； This situation can also occur due to membrane leakage. Last edited by limingshuguang on 2008-11-6 15:08.]
Zhang Naihui from the Jiangsu Chlor-Alkali Association has conducted research in this area: an investigation and analysis of the impact of anti-caking additives in refined salt on the operation of ion exchange membrane cells, with a focus mainly on the effect of Fe.
It is likely caused by the anti-caking agent, potassium ferrocyanide. In chlor-alkali plants that use large amounts of vacuum salt, it is necessary to pay attention to the impact of the anti-caking agent potassium ferrocyanide on the electrolyzers during operation. Since K4 cannot be removed during the brine purification process, it is oxidized to Fe3+ upon entering the anode chamber of the electrolyzer, resulting in a high concentration of iron ions in the anode solution. These iron ions deposit as Fe(OH)3 on the anode side of the ion exchange membrane. Fe(OH)3 also deposits on the outlet hose of the electrolyzer’s anode solution, causing the hose to turn red and making it difficult to see the flow of liquid inside the hose. Therefore, when using vacuum salt, it is necessary to communicate in advance with the vacuum salt manufacturer to use less or no anti-caking agent, potassium ferrocyanide. This post was last edited by johncom on 2009-2-12 08:45]
Yes, the question raised by the original poster is quite profound; there are many possible causes, and in my opinion, Fe is the main one. Just my personal opinion. This post was last edited by yzhms on 2009-3-4 23:12.]