Gray cast iron carbonization tower with sulfur

It is to add sulfur. Add the bagged sodium sulfide into the sodium sulfide barrel, add water, circulate it with a pump, and then pump it into the high-level sodium sulfide tank to mix with ammonia and enter the clarification barrel. It should look like this.

Colored alkali is mainly caused by corrosion of iron equipment and pipelines, causing iron to mix into heavy alkali. Too much iron will produce iron oxide and red alkali ； Excessive sulfur content will cause iron to form iron sulfide and be incorporated into the product to become gray alkali or black alkali. In addition to anti-corrosion of equipment during production, the method of adding sodium sulfide to the mother liquor is also used to prevent the formation of alkali. The sulfur content in the solution can form a protective film of ferrous sulfide on the inner walls of iron equipment and pipes, thereby reducing corrosion. ； Sulfur can interact with iron (Fe3+, Fe2+) in the mother liquor to form iron sulfide. Most of the precipitates are precipitated and removed in the ammonia mother liquor II clarification barrel to avoid entering the soda ash product.

We did not add sodium sulfide in the production of our old project. I think it may be that a thin alkali layer has formed inside the tower and pipes, preventing the mother liquor from coming into contact with the iron container. But what should we do with the newly installed tower? Should we add it continuously during production as mentioned above or treat it with sodium sulfide before production.

Is sulfur added every day during production? ? What is the amount of sulfur added? ? How much is it theoretically? ? ? The production load is large, and the amount of sulfur added must be increased accordingly.

Generally, the sulfur content in the extracted liquid can be controlled at about 0.005TI. Generally, the ammonia brine can be controlled at 0.01~0.03TI. There is no need to control it too high. Currently, the best way to control the iron content in the finished product is to add MgCl2 (Mg2+), and the effect is okay.

We did not add sodium sulfide in the production of our old project. I think it may be that a thin alkali layer has formed inside the tower and pipes. According to actual experience, it is not an alkali layer, but a calcium and magnesium ion layer.

If it is an alkali layer, it is possible that the alkali layer will be washed away during cleaning. We generally add it in production, but once color alkali appears in any system, it will be added intensively. The adhesion of calcium and magnesium to the wall of the tower will definitely have an impact on process production. So what is the impact? ? And how to clear it?

Our carbonization tower has been disassembled and I have seen the internal structure. The scale layer is actually not very thick, only about 1mm. Being attached to the tower wall actually has no effect. The only impact is on the cooling pipe, but the scale is thinner on the cooling pipe... So as long as the salt clarification work is done well, there is generally no problem.

This post was last edited by yanshan86 on 2010-6-20 16:52 How long has your tower been in use? Will it be different if it is used for a longer period of time? Or if the clarification effect is not good, how to deal with such scaling? What exactly does it take apart? I can't figure it out. I haven't experienced it before.

The purpose of demolition is to dismantle the whole piece, no more. It took about 20 years. The reason why it is not thick is actually because the quality of the salt is relatively high. As for the poor clarification effect you mentioned, I think you can feel it from the production data. The turbidity will rise quickly... The clarification effect is really not good. I don't think there will be too much sedimentation, because after all, the internal impact of the carbonization tower is violent... Of course, this is just my guess...