Abstract
Calcium ions are a kind of unavoidable ions in water. It has the deleterious effect on molybdenite flotation. High-calcium flotation wastewater (HCFW) was reused for flotation circuits after the pretreatment removing Ca2+ in from HCFW. The high cost of wastewater treatment limits HCFW reuse. In this paper, an efficient, innovative, low-cost and environmental-friendly flotation wastewater reuse technology was introduced. XLM, as a composite collector for molybdenite, is a mixture of diesel oil (DO) and polycyclic aromatic hydrocarbons (PAHs). It could reduce the deleterious effects of Ca2+ on the flotation of molybdenite in HCFW. Therefore, this was used to replace the pretreatment removing Ca2+ in from high Ca2+ wastewater and saved the cost of wastewater treatment. When XLM consists of 4 wt % PAHs and 96 wt % DO, it has better adaptability than DO in the different Ca2+ concentration of flotation water. The contact angle measurements indicated that PAHs, as a synergistic component of a composite collector, could adsorb on the edges of molybdenite in the presence of Ca2+ by forming PAHs-Ca2+-MoO42− structure to increase the contact angle of fine molybdenite particle and reduce the deleterious effects of Ca2+ on the flotation of molybdenite. The industrial-scale test further that demonstrated XLM can improve the molybdenite roughing recovery and grade by 1.8% and 3.46% compared with DO as the collector in high Ca2+ flotation wastewater. It is feasible and effective to replace high-cost wastewater treatment for molybdenum plants.
Highlights
With the rapid development of society and economy, the demand for metal material has increased dramatically all over the world
X-ray fluorescence analysis oil (DO) and polycyclic aromatic hydrocarbons (PAHs). It could reduce the deleterious effect of Ca2+
This study showed that an efficient, innovative, low-cost and environmentallyfriendly flotation wastewater reuse technology
Summary
With the rapid development of society and economy, the demand for metal material has increased dramatically all over the world This resulted in the overexploitation of mineral resources and producing large amounts of wastewater in mineral processing. Due to the shortage of fresh water and increasingly stringent regulations on the quality of discharged water, most flotation wastewater is recycled and used in the flotation process after natural sedimentation in a tailing dam or simple treatment. This can lead to several environmental improvements since it decreases discharge of pollutants and saves high-quality water from ground and surface aquifers [2].
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