Extraction of aluminum and iron from coal gangue by low temperature neutralization-pressure acid leaching

被引：0
作者：
Li H. [1 ]
Zeng D. [1 ]
Zheng G. [1 ]
Xia J. [1 ]
机构：
[1] Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 07期
关键词：
Aluminum; Coal gangue; Iron; Neutralization; Pressure acid leaching;
D O I：
10.16085/j.issn.1000-6613.2020-1529
中图分类号：
学科分类号：
摘要：
In order to solve the problems of high acid consumption, low acid utilization rate and the difficulty in separating aluminum and iron during their industrial extraction from coal gangue(CG), low-temperature neutralization-pressure acid leaching is adopted for the first time to achieve high-efficient extraction of aluminum and iron from the CG from Panzhou, Guizhou province. The optimal process conditions for the room temperature neutralization process are as follow: the acid is 20% of the theoretical consumption, the leaching time is 120min, and the mass ratio of sulfuric acid solution to solid is 3: 1. With the neutralized slag as raw material, the optimal process conditions for the pressurized acid leaching process are as follow: leaching time of 120min, leaching temperature of 150℃, and the mass ratio of sulfuric acid solution to solid of 3.5: 1 with the theoretical acid consumption of CG. Under the aforementioned conditions, the leaching rates of aluminum and iron were 95.77%, 98.37% respectively, and the contents of silicon and titanium in acid residue ash were 90.2%, 9.18% respectively. The fresh coal gangue was neutralized with the recycled acid leaching solution, yielding the concentrations of aluminum and iron in the extract solution of 62.20g/L, 57.95g/L respectively. Compared with the conventional acid leaching process, the acid consumption by the two-step process is lower, and the acid utilization efficiency is higher. Through the characterizations of the CG and slag by X-ray diffractometer (XRD), Fourier infrared spectrometer (FTIR) and Scanning electron microscope (SEM), the mechanism of carbonic acid leaching process in gangue was preliminarily analyzed. This work provides a new route and theoretical support for the industrial extraction of aluminum and iron from CG. © 2021, Chemical Industry Press Co., Ltd. All right reserved.
引用
收藏
页码：4011 / 4020
页数：9
相关论文
共 33 条
  • [1] WU Yanhui, Disposal and utilization of coal gangue and its prospect in China, China Environmental Protection Industry, 1, pp. 53-55, (2019)
  • [2] ZHAO Shuangju, ZHANG Cailang, YANG Xiaoshu, Summary of comprehensive utilization of coal gangue in China, Development Guide to Building Materials, 10, 6, pp. 47-51, (2012)
  • [3] ZHANG Guoquan, Analysis on the treatment and utilization of coal gangue under the concept of green development, Resource Conservation and Environmental Protection, 10, (2019)
  • [4] YANG Yue, Coal gangue stacked and its comprehensive utilization, Resources Economization& Environmental Protection, 32, 6, pp. 18-22, (2014)
  • [5] JIA Lutao, WU Qianyun, Properties and comprehensive utilization status of coal gangue resource, Coal Technology, 38, 11, pp. 37-40, (2019)
  • [6] GUO Yanxia, ZHANG Yuanyuan, CHENG Fangqin, Industrial development and prospect about comprehensive utilization of coal gangue, CIESC Journal, 65, 7, pp. 2443-2453, (2014)
  • [7] JIA Min, The current situation research on comprehensive utilization of coal gangue, Conservation and Utilization of Mineral Resources, 39, 4, pp. 46-52, (2019)
  • [8] Research Group of Coal Chemical Chamber of Chongqing Coal Research Institute Utilization, General situation of coal gangue treatment and utilization at home and abroad, Sichuan Coal Technology, 1, pp. 13-24, (1975)
  • [9] LI Jingyu, YOU Lifeng, WEI Yan, The current situation of comprehensive utilization of coal gangue in China, Advanced Materials Research, 524, pp. 915-918, (2012)
  • [10] ZHAN Xiaoyuan, WANG Fang, SONG Zhenqi, Et al., Development model of circular eco-industrial park for comprehensive utilization of coal gangue in coal enterprise, Materials Science Forum, 787, pp. 71-75, (2014)
1234