Technology for producing soda ash using calcium carbide slag as a substitute for quicklime
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There is an urgent need for a technology that uses calcium carbide slag instead of quicklime in the production of soda ash; I would be extremely grateful if such a technology could be provided. This post was last edited by Song Aikang918612 on 2008-10-31 at 10:16
Good topic. I’m not sure if this will work; has it been tried before? Feel free to share your thoughts
Currently, Shandong Haihua, Tangshan Sanyou, and Qingdao Alkali Industry are all using this method. This method is technologically mature, transforms waste into value, and represents a typical concept of circular economy. The main process involves using calcium carbide sludge as lime water in the lime-making unit of the soda ash plant; if there is a shortage of water, the calcium carbide sludge replaces slaked lime in the soda ash distillation tower.
The use of calcium carbide slag to produce lime has been successfully applied abroad; according to available information, an experimental plant in Louisville, Kentucky, USA, at the Air Reduction Plant, built a facility with a production capacity of 60 tons of quicklime per day in 1948. Between 1959 and 1962, two sets of lime production units with a capacity of 330 t/a were built; they operated safely and reliably, with nearly 350 operating days per year.
Our company’s 20WDpvc project is set to go into operation, but I haven’t heard anything about how to deal with this issue… Over 10 tons of calcium carbide slag are generated for every ton of PVC produced……
I think calcium carbide slag or calcium carbide slag slurry can be used in soda ash production, but it cannot completely replace lime.
A factory affiliated with the Qinghai Salt Lake uses Tianchen Institute’s technology, following this same approach. It is expected that I will be able to drive next year
This post was last edited by mkp369 on 2012-12-28 06:35. If this succeeds, it will also be a great benefit for the calcium carbide industry. Cement made from calcium carbide slag is really not good.
The acetylene process includes dry and wet calcium carbide production methods; the calcium carbide slag produced by these two methods is used in cement, and there are differences in its quality – hearsay
Large-scale calcium carbide-based PVC production relies on a wet process; the calcium carbide slag generated can be used to produce lime for soda ash production without any problems. If the soda ash plant and the PVC plant are located close to each other, the calcium carbide slag slurry can be transported directly from the PVC plant； If transporting the concentrated calcium carbide slag over long distances is troublesome, and the working conditions for feeding the slag are harsh, it is sufficient to use a slag mixing tank equipped with a mixer.
A calcium carbide plant in Xining, affiliated with the Qinghai Salt Lake, uses a dry-process method for producing calcium carbide – said to be a rare innovation – offering advantages such as water conservation