How can gasification slag be utilized in a resource-efficient, reduced-volume, and harmless manner?
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(1) Drying of the gasification fine slag filter cake: The filter cake obtained by flocculation sedimentation and filtration of the gasification fine slag has a moisture content of around 60%. By using the filter cake pressing technique to reduce the moisture content, the gasification fine slag can be fed into boilers for co-firing; in particular, enterprises with a high residual carbon content in their gasification slag can recycle the fixed carbon present in that slag. The main issue is that this technology is still in the stage of promotion and application, lacking operational data from boilers using it in combination with other fuels, which makes it difficult to calculate its benefits. (2) Pressing gasified fine slag into boilers for co-firing – This technology was introduced to the market relatively early, and some power generation companies have achieved significant benefits by using specialized equipment to press coal slurry into boilers for co-firing. Two companies were investigated regarding the use of extrusion to feed the gasified fine slag into boilers for co-firing; one company stopped operating after conducting experiments, while the other had high environmental standards and used this method to convert the gasified slag into dry slag for shipment, without considering economic benefits. (3) Carbon extraction via flotation of gasification slag: This technology is similar to the slurry flotation process used in coal washing plants. I visited an enterprise that was using this technique; its facilities were quite basic and the working conditions were poor. In this process, the residual carbon in the gasification slag is extracted and then dried, after which it is sold after being mixed with coal from coal mines. The advantage of this technology is that it allows for the simultaneous treatment of coarse and fine slag. If existing manufacturers undergo a series of upgrades in terms of environmental protection, occupational health, and automation, this could also be a promising technical approach. Purification of fine slag and residual carbon was also implemented at a factory in Xianyang; however, not long after the trial operation began, the plant stopped operating entirely due to urban development.
The resource utilization, reduction, and harmless treatment of gasification slag indeed require collaboration among multiple enterprises and across different industries in order to achieve balance throughout the entire environmental chain. Coal chemical enterprises alone cannot solve this problem fundamentally.
This has great research value and a huge market potential
This requires the development of new, efficient and simple products; in the past, most of it was taken to brick factories to be turned into bricks.
A professor at Yulin University worked on a project related to the flotation of carbon residue from gasification slag; I’m not sure what became of that project later on
Is it possible to enrich the metal in the slag for use in metallurgy, or to use the slag as an insulating material?
It’s feasible; let’s study it together. The market is huge
The prospects for this project are definitely good; the problem is that no optimal approach has been found yet, and most approaches have their issues, which results in an inability to achieve effective widespread application.
Hello, could I learn about the flotation materials you mentioned? Thank you
I also want to learn*, but flotation is their secret
It is said that this process uses gasified slag as the main raw material, and plasma-assisted melting technology as its core technique to produce inorganic fireproof insulation materials. The downstream market for such products is huge, at 4 million tons per year; the cost of producing these materials is 20% lower than that of insulation materials produced using traditional methods. The utilization rate of gasified slag is nearly 100%, resulting in significant economic and environmental benefits.