Abstract
Due to the increasing graphite production, the accumulation of graphite tailings in China has grown rapidly, leading to significant environmental issues. The crucial aspect is to implement a disposal method that minimizes environmental pollution. In light of this, we propose the mineralization and cementation of loose graphite tailings sands using microbially induced calcium carbonate precipitation (MICP). Firstly, we conducted an aqueous solution test to measure the amount of CaCO3 precipitation at various bacterial concentrations, cementation solution concentrations, and cementation solution pH levels. The results indicate that higher bacterial concentration and cementation solution concentration do not necessarily lead to greater CaCO3 precipitation. Additionally, the pH of the cementation solution has little effect on the precipitation of CaCO3. Secondly, the biocementation effect was evaluated by unconfined compressive strength (UCS) tests, CaCO3 content tests, water retention tests, wind erosion resistance tests, durability tests, scanning electron microscopy (SEM) tests, and X-ray diffraction (XRD) tests. The experimental results demonstrate that the graphite tailings cured by MICP exhibit commendable wind erosion resistance, water retention, and sufficient strength, thereby effectively controlling dust.
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