Abstract
Dealing with mineral tailings is one of the most important topics for solving the environmental problems in the mining industry. Among the techniques converting stacked molybdenum tailings to reusable cleaner products, one of the most effective ones is to use molybdenum tailings in concrete productions. The physical properties including density, microscopic structure and finesse module, and chemical composition of molybdenum tailings are similar with those of natural sand. The radionuclide assessment of molybdenum tailing meets the requirements for using as structural materials. Therefore, Molybdenum tailing is suitable to be used as the replacement of cement and fine aggregates in mortar and concrete. Based on the results of strength and duration performance comparison, the usage of molybdenum tailing as a replacement of natural sand is a more feasible way than that of ground super-fine molybdenum tailings in cement binder. It is feasible to use molybdenum tailings as fine aggregate in the preparation of structural concrete. When the amount of ground super-fine molybdenum tailings replacing cement is less than 10%, it is beneficial to improve the freeze-thaw and carbonization resistance of the concrete.
Highlights
Molybdenum is a widely used metallic alloying agent in stainless steel and super-alloys for resisting corrosion and improving strength [1]
This paper has reviewed the various properties of cement mortar and concrete in which binder or fine aggregates have been replaced with molybdenum tailing (MoT) at different proportions
The properties of MoT and the performance of cement mortar and concrete mixed with MoT have been analyzed from the reported results
Summary
Molybdenum is a widely used metallic alloying agent in stainless steel and super-alloys for resisting corrosion and improving strength [1]. By 2018, the molybdenum world mine production has risen to 300,000 metric tons while China accounts for more than 1/3 of it [2]. Since molybdenum is commonly found in combination with other metals, large amount of molybdenum tailing (MoT) is inevitably produced during smelting [3]. About 36 million tons per year of molybdenum tailings are discharged in China [4]. A large landfill is required to storage these tailings which would bring dissolved metals into surface waters in the presence of snowmelt or infiltrating rainwater. How to effectively decrease the enormous storage volume of mineral tailings is treated as one of the most imminent task for the sustainable development of mining industry [5]
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