China Shenhua Energy Company Limited

Junzhou Chi

Nan Li

Zhaohua Guo

Dazhao Gu

Cundi Wei

Jianguo Han

Wenhui Zhang

Jianmin Zhang

Yixin Zhao

Yanbin Sun

Hong Dong

Ping Zou

Qingan Nan

Peiping Zhang

Yongwang Wang

Shaonan Xu

Yinshan Jiang

Sa Lv

Wen Ling

Dianfan Yang

Provided a method for preparing metallurgical-grade alumina by using fluidized-bed fly ash, comprising: a) removing iron by wet magnetic separation after crushing the fly ash; b) reacting the fly ash after magnetic separation with hydrochloric acid to obtain a hydrochloric leachate; c) passing the hydrochloric leachate through macro-porous cationic resin to deeply remove iron to obtain a refined aluminum chloride solution; d) concentrating and crystallizing the refined aluminum chloride solution to obtain an aluminum chloride crystal; and e) calcining the aluminum chloride crystal to obtain the metallurgical-grade alumina. The method is simple, the procedure is easy to be controlled, the extraction efficiency of alumina is high, the production coast is low, and the product quality is steady.

Method for preparing metallurgical-grade alumina by using fluidized bed fly ash

A vertical ring magnetic separator for de-ironing of coal ash comprises a rotating ring (), an inductive medium (), an upper iron yoke (), a lower iron yoke (), a magnetic exciting coil (), a feeding opening (), a tailing bucket () and a water washing device (). The feeding opening () is used for feeding the coal ash to be de-ironed, and the tailing bucket () is used for discharging the non-magnetic particles after de-ironing. The upper iron yoke () and the lower iron yoke () are respectively arranged at the inner and outer sides of the lower portion of the rotating ring (). The water washing device () is arranged above the rotating ring (). The inductive medium () is arranged in the rotating ring (). The magnetic exciting coil () is arranged at the periphery of the upper iron yoke () and the lower iron yoke () so as to make the upper iron yoke () and the lower iron yoke () to be a pair of magnetic poles for generating a magnetic field in the vertical direction, wherein the inductive medium () is layers of steel plate meshes, each steel plate mesh is woven by wires, and ridge-shape sharp corners are formed at the edges of the wires. A method for magnetically separating and de-ironing of coal ash, utilizes the vertical ring magnetic separator for de-ironing of coal ash. By adopting the vertical ring magnetic separator and the method of magnetic separation for de-ironing, the de-ironing efficiency is improved by at least 20%.

Vertical ring magnetic separator for de-ironing of pulverized coal ash and method using the same

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Beijing, China

Junzhou Chi