An efficient milling-assisted technology for K-feldspar processing, industrial waste treatment and CO2 mineralization

作者：Shangguan, Wenjie; Song, Jimin; Yue, Hairong^*; Tang, Siyang; Liu, Changjun; Li, Chun; Liang, Bin; Xie, Heping

来源：Chemical Engineering Journal, 2016, 292: 255-263.

DOI：10.1016/j.cej.2016.02.031

• Milling-assisted
• Industrial waste treatment
• Environmental chemical
• CO2 mineralization
• K-feldspar
• Mineral processing

This paper describes an environmentally friendly and efficient milling-assisted technology to produce soluble potassium from natural K-feldspar with the additive of calcium salts, and capture CO2 via mineralization. The milling-assisted process could facilitate the extraction of potassium from K-feldspar under mild conditions (e.g. 30-40 degrees C), and mineralize CO2 with reacted calcic slag. The milling-assisted and mineralization conditions (e.g. milling time and material ratio) were systematically investigated, reaching a maximum potassium extraction ratio of 80% and a CO2 mineralization ratio of 5%. Characterizations indicated that the fragmentation, amorphization, and lattice distortion of the mineral particles during milling-assisted process are responsible for the enhanced K-feldspar decomposition reactions and ion-exchange reaction with calcium salt. Reaction principles of K-extraction and CO2 mineralization are discussed, and a possible mechanism of milling-assisted process was proposed.

• 出版日期2016-5-15
• 单位四川大学