Progress in the treatment of soda ash waste residue from the ammonia-soda process
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This post was last edited by yongzhan77 on October 13, 2009, at 17:26. The treatment of alkali residue is a worldwide challenge and the primary issue hindering the production and development of ammonia-soda process enterprises. We invite industry professionals to share their achievements in alkali residue treatment so that we can exchange ideas and facilitate the timely resolution of this problem. This will help transform the ammonia-soda process for soda ash production into an environmentally friendly one, enabling this one of the three major soda-making processes to regain its vitality.
#1 yongzhan77: Currently, the best-performing company in the industry seems to be one based in Qingdao; it is said that they’ve found a way to completely cure the problem
It seems that currently, no ammonia-alkali projects involving the discharge of alkali residues are allowed to be launched. Could the person above please elaborate on what exactly is meant by a “permanent solution”?
The industrialization of the white mud desulfurization project by Qingdao Soda Industry has been successfully achieved. Reportedly, all boilers are operating normally; the desulfurization efficiency can reach 95%. The treated desulfurization liquid is discharged as a clear solution, resulting in no secondary pollution. This is truly a major event in the soda ash industry; as a result, the ammonia-soda process has become a green production method, one that is even cleaner than the double-soda process. Although other alkali plants also carry out desulfurization, their results fail to reach this level.
According to the annual soda ash conference, many ammonia-soda process plants are conducting research on alkali residues. A southern soda ash plant reported success in desulfurization; however, it remains unclear what the scale of this achievement is and how the waste gypsum is being disposed of The desulfurization process at Haihua has also been deemed successful. With an annual production capacity of 3 million tons of soda ash, it generates approximately 900,000 tons of alkali residue each year. Can this amount be fully utilized? I hope those with information can provide more details.
I’ve heard of desulfurization using white mud before. How to achieve industrialization? Please discuss it in detail.
In the offshore waters of Qingdao, desulfurization is carried out using a slurry of seawater and white mud. The desulfurization efficiency exceeds 95%. After desulfurization, the clarified liquid is discharged. This process not only solves the problem of boiler desulfurization but also utilizes the white mud, resulting in no secondary pollution. It is thus a clean desulfurization technology. The soda ash plant produces waste gypsum; it would be great if this could be sold as a product. Otherwise, it remains just another type of solid waste.
It seems that the solid waste resulting from the treatment of soda ash residue is rather difficult to handle.