Zero emissions
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What are the prospects for evaporation crystallization in zero-emission projects these days? In the Yulin area of Shaanxi?
New coal chemical projects must be established in Yulin, Ningxia, and Inner Mongolia. There are many technical approaches, with 7 or 8 different process routes; none of them stands out significantly over the others.
This post was last edited by Wise Ming on 2022-1-10 at 15:34. Whether crystalline mixed salts are considered hazardous waste or not, the fact that they are all stored in temporary holding ponds remains a troublesome issue. There are not many mixed salts of different qualities.
In the northwestern region, there are numerous coal chemical projects; in the past, evaporation desalination was sufficient, but the large amount of brine generated posed a significant challenge for treatment. Now, it’s not just property owners; many evaporation manufacturers also want to engage in salt separation. There are various approaches to this, but many of them merely do a minimal amount of salt separation as a formality. Some even use the pretext of salt separation without actually carrying out any real work. It’s likely that there are very few projects that are truly implemented effectively in this area
I’m currently in this industry, but I don’t want to continue working there anymore; I feel it lacks technical complexity.
The technical complexity is quite high; as mentioned on the 5th floor, it involves truly applying zero-emission technologies to separate different types of salts and turn waste into valuable resources.
It is a technology that involves adding steam and then removing steam to carry out flashing. We use a three-effect counter-current evaporation process: after the mine water is concentrated through the first and second membrane stages, the concentrated solution enters a falling-film evaporator, where it undergoes forced triple circulation before proceeding to the first effect. By controlling the concentration at the end of the evaporation process, crystalline salts are produced, namely anhydrous sodium sulfate, which is the final product. To control the quality of the product salt, a portion of the mother liquor is discharged through a triple-effect system and sent to the mixed-salt evaporator for further evaporation, resulting in the formation of small amounts of impure salts.
Is it a China State Construction Environmental Energy project? The content of impure salts here is around 2%
To become successful, it is essential to fully understand the manufacturing processes in order to reduce economic costs. In Yulin, things are mainly in a phase of exploration and mutual learning*