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- Title
铝酸钙飞灰中钾的回收利用工艺研究.
- Authors
杨红军; 王 敏; 戈海文; 乔友民; 乔子洋
- Abstract
Potassium is one of the plant nutrient elements. China is a large agricultural country, meanwhile, China is deficient in potassium. Every year, a large amount of potassium fertilizer (mainly potassium chloride) are imported to meet the needs of agriculture. A solid waste-fly ash is produced in the course of production of calcium aluminate by calcination. The fly ash contains potassium chloride, aphthitalite, syngenite, anhydrite, etc. Among these minerals, potassium chloride and aphthitalite are water-soluble. The content of soluble potassium in the fly ash is as high as about 23.52%, so it′s necessary to recycle the potassium. The results of its mineral characterization and theoretical analysis based on phase diagram data showed that it was suitable for recycling of potassium to adopt process of thermal dissolution-evaporation-cold crystallization process. Potassium sulfate and potassium chloride could be produced. The investigation of the process condition and optimization were done. The optimal conditions were as follows: the temperature of thermal dissolution and cold crystallization, the liquid-solid ratio, dissolving time were 90 ℃ and 25 ℃, 3.4∶1, 1 h, respectively. After continuous dissolving of 6 times, about 95% of potassium was dissolved. According to composition of the leaching liquid, the amount of water evaporation was as same as the theoretical analysis. And 81.3% of potassium was crystallized under the conditions. The results showed that it was available to recycle the potassium from the fly ash by dissolution-crystallization process to produce potassium sulfate and potassium chloride.
- Subjects
CHINA; POTASSIUM fertilizers; POTASSIUM sulfate; POTASSIUM chloride; FLY ash; CALCIUM aluminate; PLANT nutrients
- Publication
Inorganic Chemicals Industry, 2023, Vol 55, Issue 10, p121
- ISSN
1006-4990
- Publication type
Article
- DOI
10.19964/j.issn.1006-4990.2022-0692