无机盐工业 ›› 2023, Vol. 55 ›› Issue (7): 10-17.doi: 10.19964/j.issn.1006-4990.2022-0545
王丽萍(
), 李超(
), 常宁, 曹坤, 高桂梅, 张云峰, 洪雨, 图亚, 赵建强
收稿日期:2022-09-08
出版日期:2023-07-10
发布日期:2023-07-13
通讯作者:
李超(1983— ),男,博士,高级工程师,主要从事粉煤灰中有价元素提取及高附加值开发利用研究工作;E-mail:lichao_1122@163.com。作者简介:王丽萍(1984— ),女,博士,高级工程师,主要从事粉煤灰等固废综合利用研究工作;E-mail:chwlp2008@163.com。
基金资助:
WANG Liping(
), LI Chao(
), CHANG Ning, CAO Kun, GAO Guimei, ZHANG Yunfeng, HONG Yu, TU Ya, ZHAO Jianqiang
Received:2022-09-08
Published:2023-07-10
Online:2023-07-13
摘要:
煤矸石是中国排放量以及堆存量最大的工业固体废弃物之一,其含有丰富的铝、硅、铁以及一些微量或痕量元素,如锂、镓、钛以及稀土元素等,这些元素中的一种或多种富集到工业价值后就可以综合利用。主要概述了煤矸石在铝、硅、铁以及稀有金属回收领域的研究现状,通过分析以上化学元素回收技术的优缺点,指出技术壁垒是煤矸石利用中的迫切问题,探索不同种类煤矸石应用的科学组合以及煤矸石在不同行业之间的应用研究、缩短工艺流程、形成煤矸石利用的产业链,将是早日实现煤矸石综合利用工业化的必经之路。
中图分类号:
王丽萍, 李超, 常宁, 曹坤, 高桂梅, 张云峰, 洪雨, 图亚, 赵建强. 煤矸石中有价元素回收技术研究进展[J]. 无机盐工业, 2023, 55(7): 10-17.
WANG Liping, LI Chao, CHANG Ning, CAO Kun, GAO Guimei, ZHANG Yunfeng, HONG Yu, TU Ya, ZHAO Jianqiang. Research progress of recovery technology of valuable elements from coal gangue[J]. Inorganic Chemicals Industry, 2023, 55(7): 10-17.
表1
中国部分地区煤矸石的化学组成
| 煤矸石样品 | w(SiO2) | w (Al2O3) | w (Fe2O3) | w (TiO2) | w (CaO) | w (MgO) | w (K2O) | w (Na2O) | 烧失量 |
|---|---|---|---|---|---|---|---|---|---|
| 陕西铜川 | 44.75 | 37.43 | 0.99 | 1.43 | 0.07 | 0.15 | 0.56 | 0.18 | 13.62 |
| 江苏徐州 | 45.73 | 38.69 | 0.47 | 0.45 | 0.09 | 0.16 | 0.16 | 0.14 | 13.92 |
| 内蒙古准格尔 | 42.72 | 47.79 | 2.50 | 2.00 | 2.50 | 0.40 | 0.40 | 0.20 | 13.02 |
| 湖南常德 | 44.73 | 35.21 | 1.61 | 1.42 | 0.21 | 0.48 | 0.28 | 0.35 | 14.26 |
| 四川攀枝花 | 58.26 | 21.13 | 5.92 | 4.79 | 2.36 | 4.62 | 1.79 | 0.32 | 15.04 |
| 山西大同 | 42.28 | 39.37 | 0.33 | 0.09 | 0.58 | 0.15 | 0.94 | 0.36 | 15.22 |
| 贵州盘州 | 40.80 | 19.17 | 12.80 | 4.70 | 2.73 | 2.14 | 0.18 | 0.26 | 15.75 |
表3
稀有金属提取技术归纳表
| 技术方法 | 优点 | 缺点 | 存在问题 | |
|---|---|---|---|---|
| 锂提取 | 碱熔+盐酸浸出+吸附法 | 锂提取率高、锂选择性好 | 能耗高、硅渣含锂 | 硅渣需处理、离子筛需改善锰溶损 |
| 镓提取 | 高温焙烧+加压酸浸+萃 取工艺;低温酸浸+萃取/ 离子交换/液膜工艺 | 利用碳本身燃烧、节能、镓浸出率高、萃取率高;萃取法萃取率较 高;离子交换树脂合成简单、适用 于高酸环境、低浓度镓回收;液膜 法萃取效率最高 | 硅渣含镓,质量分数小于20%;萃取剂处理困难、污染环境;低温酸浸法酸耗高、耗时长;萃取剂回收难、污 染环境;离子交换效果一般;液膜萃取剂处理难、污染环境 | 酸浸均产生硅渣,需处理;萃 取剂回收处理难,易引起火灾 和环境污染 |
| 钛提取 | 微波辅助+酸浸法 | 钛提取率较高、反应时间短 | 微波设备放大难 | 难以实现工业化 |
| 稀土元素提取 | 焙烧+盐酸浸出法;酸浸+协同萃取 | 利用碳本身燃烧、节能、稀土元素浸出率高(接近100%);稀土元素 萃取效率高 | 焙烧温度精准控制难,需要后续对稀土元素进行分离;酸浸时稀土元素浸出不完全、萃取剂回收处理困难 | 处于实验室研究阶段,需要技术重组并推进后续工作,还要注意萃取剂回收处理问题 |
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