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Recovery of K2SO4 and Separation of SiO2/Al2O3 from Brown Corundum Fly Ash
Metals ( IF 2.6 ) Pub Date : 2020-11-29 , DOI: 10.3390/met10121603
Yuandong Xiong , Junqi Li , Qian Long , Chaoyi Chen , Yuanpei Lan , Linzhu Wang

Brown corundum fly ash (BCFA), which is the collected ash in brown corundum production, has received lots of environmental concerns due to its ultra-fine particle size and complex composition. Aiming to recycle the major elements including K, Al and Si from BCFA environmentally, this work proposed a simple and non-pollution process to utilize BCFA by water leaching, size screening and solution evaporation. The influences of water leaching conditions including leaching temperature, time and liquid-to-solid ratio was considered to optimize the K2SO4 recovery efficiency. Results show that the potassium sulfate content of the product is 75.7% after water leaching at 60 °C for 15 min with the liquid–solid ratio of 20:1. The wet screening and size separation with a 1 μm sieve can separate and enrich aluminum and silicon significantly. The aluminum-rich product is composed of 54.65% of alumina and 11.04% silica, with the alumina and silica ratio (A/S) of 4.95. The silicon-rich product with a particle size of less than 1 μm has a silica content of 57.57% can be used as high-value micro-sphere silica. The research results revealed in this work offers a potential and environmentally industrial treatment technique for the BCFA.

中文翻译:

棕刚玉粉煤灰中K2SO4的回收和SiO2 / Al2O3的分离

棕刚玉粉煤灰(BCFA)是棕刚玉生产中收集的灰分,由于其超细的粒径和复杂的组成而引起了许多环境方面的关注。为了环保地回收BCFA中的K,Al和Si等主要元素,这项工作提出了一种简单且无污染的工艺,通过水浸,筛分和溶液蒸发来利用BCFA。为了优化K 2 SO 4,考虑了浸出条件的影响,包括浸出温度,时间和液固比。恢复效率。结果表明,在60°C水浸15分钟,液固比为20:1后,产品的硫酸钾含量为75.7%。使用1μm筛子进行湿筛和筛分可​​以显着分离和富集铝和硅。富铝产品由54.65%的氧化铝和11.04%的二氧化硅组成,氧化铝与二氧化硅之比(A / S)为4.95。粒径小于1μm的富硅产品的二氧化硅含量为57.57%,可用作高价值的微球二氧化硅。这项工作揭示的研究结果为BCFA提供了一种潜在的,环境友好的工业处理技术。
更新日期:2020-12-01
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