How to remove residues and dehydrate coal tar
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This post was last edited by Desert Poplar on February 27, 2011, at 16:15. The density of coal tar is around 1.08; it contains approximately 50% water. The amount of sludge present is uncertain. The goal is simply to remove the water; the sludge can be sold together with the oil. Currently, high-speed centrifuges are used for dehydration. However, the results have been unsatisfactory. During dehydration, the temperature is maintained between 65 and 80 degrees. I would like to ask the experts: Does the presence of slag affect dehydration? If so, how can the residue be removed? I heard there’s something like a second wash? Is it necessary to add some kind of reagent?
Firstly, the dehydration temperature you chose is not appropriate; it should be 80–90°C for better dehydration results； Secondly, is there any issue with the selection of your centrifuge? Once again, is there anything wrong with the operation of your centrifuge? Are the speed differences, as well as the speeds and frequencies of the main motor and the auxiliary motor, all correct? ； Finally, you should try to minimize the water content of what goes into the centrifuge. Reduce the load on the centrifuge.
Reply to 2# Desert Poplar: The selection of the centrifuge is fine, and the operating parameters are set correctly. The problem now is that it’s not that dehydration isn’t possible, but rather that only a small amount of water can be removed; therefore, I suspect that the high dust content in coal tar may be affecting the dehydration process Also, has the coal tar been emulsified into asphalt?
Reply to 3# szunited: An increase in coal dust and coke dust, as well as a rise in the standard temperature of the coke ovens, can all affect the dehydration and viscosity of tar. To check whether emulsification has occurred, you can observe the effect of static separation and dehydration in the tar storage tank, as well as whether there is an increase in tar in the circulating ammonia solution. The most straightforward method is to use a large beaker; maintaining a constant temperature, add some tar to it and observe how it layers up.
Reply to 4# Desert Poplar: Thank you for your reply. However, I buy coal tar from manufacturers and process it myself; I suspect that the light oil has evaporated, leaving only the heavy oil, which makes it difficult to remove water. Could you advise me on any methods for dehydration? Would adding a demulsifier work?
Amitabha! Donor, put down the knife and become a Buddha right away! Even if it is successful, the coal tar you produce in this way, when sold to manufacturers like us who use coal tar as a raw material, will only cause endless problems for our production and also affect the quality of our products. OP, be fair!
Density of 1.08? What kind of oil is it? With such a low density, it has become a light fraction of coal tar.
Reply 5# szunited: Oil evaporation? It’s that exaggerated over there. That’s not right; you must have a tar storage tank, right? You can use its heating coil to remove water from it, with an overflow port on the outside. To ensure the quality of tar, you must have your own preliminary treatment processes for dehydration and deslagging; otherwise, stable production will be difficult to achieve.
The profile picture of the OP indicates that you have a deep connection with super centrifuges
Reply to 9# richardpai: Yes, our company manufactures super centrifuges, haha.
Reply to 2# Desert Poplar: The problem lies in the too high feed concentration. Friends, it’s not good to have a too high feed concentration in a spiral conveyor