POTENTIAL USE OF COLTAN MINING WASTE ROCK IN ROAD CONSTRUCTION

IF 0.8 Q4 ENGINEERING, CIVIL

Advances in Civil and Architectural Engineering Pub Date : 2023-09-21 DOI:10.13167/2023.27.2

Alinabiwe Nyamuhanga Ally, Manjia Marcelline Blanche, Masika Muhiwa Grâce, Elodie Rufine Zang, Ngapgue François, Chrispin Pettang

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Abstract

The mining industry produces vast quantities of mine refuse, including waste rock and tailings, which pose a significant environmental problem. Mining residues, which are generated during ore extraction and mineral processing, are typically deposited near mines. This method of mine waste disposal can lead to environmental problems and land loss. This fact has prompted research into the utilisation of sediments as alternative materials to produce backfill and paving materials. The Democratic Republic of the Congo (DRC) possesses approximately 80 % of Africa’s coltan reserves, which is geologically unsustainable considering its many mineral resources. When coltan is extracted, geologically heterogeneous debris spanning from fine particles to boulders is produced. The purpose of this study was to analyse the potential value of mine tailings in road embankments using coltan waste rock from the eastern DRC as a case study, in accordance with the French standard. To accomplish this, it was necessary to evaluate the coltan waste rock’s chemical, mineralogical, and geotechnical properties. The coltan mining waste rock studied (SS1,i, SS2,i, and SS3,i) were found to be naturally clayey in nature, with characteristics for use in road construction. However, stabilised at 60 % by the SS4, classified as sand according to the Laboratoire Central des Ponts et Chaussées (LCPC) classification, the SS1,i, SS2,i, and SS3,i clayey waste rock possess the necessary characteristics for sub-base course materials.

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钶钽铁矿废石在道路建设中的潜在应用

采矿业产生了大量的矿渣，包括废石和尾矿，造成了严重的环境问题。采矿残留物是在矿石提取和矿物加工过程中产生的，通常沉积在矿山附近。这种矿山废弃物处理方法会导致环境问题和土地流失。这一事实促使人们研究利用沉积物作为替代材料来生产回填和铺路材料。刚果民主共和国(DRC)拥有非洲约80%的钶钽铁矿储量，考虑到其众多矿产资源，这在地质上是不可持续的。当提取钶钽铁矿时，会产生从细颗粒到巨石不等的地质不均匀碎屑。本研究的目的是根据法国标准，以刚果民主共和国东部的钶钽铁矿废石为例，分析矿山尾矿在道路路堤中的潜在价值。为了实现这一目标，有必要评估钶钽铁矿废石的化学、矿物学和岩土力学性质。所研究的钶钽铁矿废石(SS1,i, SS2,i和SS3,i)在性质上是天然粘土，具有用于道路建设的特性。然而，SS4稳定在60%，根据laboratory Central des Ponts et chauss (LCPC)分类归类为砂，SS1、i、SS2、i和SS3、i粘土废石具有亚基层材料的必要特征。

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Advances in Civil and Architectural Engineering

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