Coking plant sulfuric acid AN
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What are good ways to deal with the mother liquor turning black and producing black foam? Or what causes this?
How is the operation of your electrostatic tar collectors? Generally speaking, their operation is unstable; the gas containing ammonium sulfate has a high tar content, which can cause the ammonium sulfate product to turn black. In addition, there are many impurities in the gas – coal dust, coking slag, and tar – and the suction force of the blower is too high.
In addition to checking the tar removal efficiency of the electrostatic tar catcher mentioned above, that is, the tar content in the gas after the blower should be below 50 mg/m3, it is also necessary to check the tar removal performance of the primary cooler. Additionally, the ammonium sulfate system is checked to see if it becomes alkaline; an alkaline mother liquor turns gray, and the ammonium sulfate crystals also turn gray and remain in this state for about a week.