Physicochemical and mineralogical characterization of Musina mine copper and New Union gold mine tailings: Implications for fabrication of beneficial geopolymeric construction materials

被引：51

作者：

Gitari, M. W. ^{[1
]}

Akinyemi, S. A. ^{[1
]}

Thobakgale, R. ^{[1
]}

Ngoejana, P. C. ^{[1
]}

Ramugondo, L. ^{[1
]}

Matidza, M. ^{[1
]}

Mhlongo, S. E. ^{[2
]}

Dacosta, F. A. ^{[2
]}

Nemapate, N. ^{[2
]}

机构：

[1] Univ Venda, Environm Remediat & Water Pollut Chem Grp, Dept Ecol & Resource Management, Private Bag 10 5050, ZA-0950 Thohoyandou, South Africa

[2] Univ Venda, Dept Min & Environm Geol, Private Bag 10 5050, ZA-0950 Thohoyandou, South Africa

来源：

JOURNAL OF AFRICAN EARTH SCIENCES | 2018年 / 137卷

关键词：

Copper tailings; Gold tailings; Sequential extraction; Geopolymer materials; Leachates; Trace inorganic contaminants; SEQUENTIAL EXTRACTION PROCEDURE; HEAVY-METALS; TOXIC METALS; SOILS; DISSOLUTION; SEDIMENTS; BRICKS; CHINA; DUST;

D O I：

10.1016/j.jafrearsci.2017.10.016

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The mining industries in South Africa generates huge amounts of mine waste that includes tailings; waste rocks and spoils. The tailings materials are dumped in surface impoundments that turn to be sources of hazards to the environment and the surrounding communities. The main environmental hazards posed by these tailings facilities are asociated with their chemical constituents. Exposure to chemical constituents can occur through windblown dust, erosion to surface water bodies, inhalation by human beings and animals and through bioaccumulation and bio magnification by plants. Numerous unrehabilitated tailings dumps exist in Limpopo province of South Africa. The communities found around these mines are constantly exposed to the environmental hazards posed by these tailing facilities. Development of a cost-effective technology that can beneficially utilize these tailings can reduce the environmental hazards and benefit the communities. This paper presents the initial evaluation of the copper and gold mine tailings in Limpopo, South Africa with a view to assessing the suitability of conversion into beneficial geopolymeric materials. Copper tailings leachates had alkaline pH (7.34-8.49) while the gold tailings had acidic pH. XRD confirmed presence of aluminosilicate minerals. Geochemical fractionation indicates that majority of the major and trace species are present in residual fraction. A significant amount of Ca, Cu and K was available in the mobile fraction and is expected to be released on tailings contacting aqueous solutions. Results from XRF indicates the tailings are rich in SiO2, Al2O3 and CaO which are the main ingredients in geopolymerization process. The SiO2/Al2O3 ratios indicates the tailings would require blending with Al2O3 rich feedstock for them to develop maximum strength. Moreover, the tailings have particle size in the range of fine sand which indicates potential application as aggregates in conventional brick manufacture. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：218 / 228

页数：11

共 51 条

[1] Utilization of cement kiln dust (CKD) to enhance mine tailings-based geopolymer bricks [J].