Liquidized waste ash
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I would like to ask fellow professionals in this industry: do ammonia-alkali plants use liquefied waste ash? Please share and exchange ideas!
It doesn’t work well; the concentration of the gray slurry cannot be increased.
However, some literature states that it is used abroad, with concentrations reaching 200 tt. If it doesn’t work, what is the specific reason for that? I would be grateful if experts could provide some guidance!
Director Liu, a long time ago there were experimental articles on the soda ash industry; I can’t remember which company published them – it seemed to be Tangshan Sanyou. Those articles stated that direct complete dissolution is not feasible, as the concentration cannot be achieved, and instead Xishaduo is formed. The only options are to reduce the amount used or to adopt a distributed approach. The existing production process needs to be modified, as this affects the capacity of the current lime processing machines
According to chemical equilibrium, the waste liquid contains approximately 40 tt of calcium, which is a relatively high amount and will inhibit the digestion reaction from proceeding further
The co-ionic effect is easy to understand, but how can we explain the formation of many fine sands?
My guess is that the composition of this fine sand is still different from that of the recycled sand, and it can still be digested. When slaked lime blocks come into contact with water, they break down into multiple small pieces; it is not a process of a large piece gradually shrinking. If the mixing intensity of the lime processing machine is sufficient, the material will turn into fine sand, and it will be difficult to further break it down at that point. According to the ionization equilibrium of calcium hydroxide, when the concentration of calcium ions is high, the decomposition process slows down. If the decomposition time is insufficient, what comes out of the lime processing machine will be fine sand
Several alkali plants in our country are using it, adding waste liquid in proportion; the current usage works well, with the slurry concentration reaching 170–180 tt, and no further increases are being tried.