Development and challenge of paste technology in China

Abstract

As paste technology can effectively ensure safe mining conditions and realize green mining, it has been popularized and widely applied in China in recent years. Meanwhile, with the development of intelligent control, precise preparation and personalized filling, studies on paste technology in China have also been deepened. In this paper, the basic concepts and characteristics of paste technology were introduced, and the development of paste technology in China was analyzed statistically. It systematically analyzed the latest research progress in thickening dewatering of unclassified tailings, pipeline transportation of structure flow, multi-field influence in stopes, development of new materials and construction of paste engineering laboratory. The practical effects of paste technology in underground backfill and surface deposition were also introduced. In the future, paste technology will achieve great breakthroughs by digitization and intelligence and realize adaptive control of concentration, precision preparation of paste, personalized filling of stopes and 3D and modular design and assembly of system, leading mining industry in China to the path of green development.

The development and practice of new quick-setting filling materials prepared by total industrial wastes

“…In contrast, the bleeding rate of TQS-BFB tailings slurry with the formulas of T100C71 and T200C73 is less than 5%. In this case, the anti-segregation of the slurry is significantly improved and can meet the requirements for the underground paste backfill (Wu et al 2017a).…”

Investigation on Mechanical Characteristics and Microstructure of Cemented Whole Tailings Backfill

“…The tailings samples were determined to contain 12% sulfur (S), and the analysis confirms the presence of pyrite in mineral wastes. The results of the physical characterization of the tailings presented in Table 1 and Figure 1 illustrated that the tailings material used has an apparent porosity around 36%, a specific gravity of 2.8, a bulk density of 2.3 g/cm 3 and a specific surface area (SSA) of 630.036 m 2 /kg. The measurements cover a range of 0.1 to 750 μm with 1% precision.…”

“…As displayed in Table 2, the dominant chemical elements are silicon dioxide (42.2%), magnesium oxide (32.7%) and ferric oxide (12.14%), aluminum oxide (4.04%), calcium oxide (3.73%) with lower amounts of potassium oxide (0.39%) titanium dioxide (0.33%), sulfur (1.25%), copper (0.26%), chlorite (0.057%) and nickel (0.28%), same compositions of sulfur and nickel are conferred to [11,12] Looking at the loss-on-ignition, it was apparent that organic substances and volatile compounds made up about 4.22% of the tailings. The mineralogical composition obtained using A Ultima IV X-ray diffractometer equipped with a copper anticathode (Rigaku,Tokyo,Japan), X-ray analyses specified in Figure 2a that the abundant silicate The results of the physical characterization of the tailings presented in Table 1 and Figure 1 illustrated that the tailings material used has an apparent porosity around 36%, a specific gravity of 2.8, a bulk density of 2.3 g/cm 3 and a specific surface area (SSA) of 630.036 m 2 /kg. The measurements cover a range of 0.1 to 750 µm with 1% precision.…”

“…of the binders are shown in Figure 1 and Table 1, respectively. The specific density (2.92 g/cm 3 ) and the specific surface area (2067.94 m 2 /kg) of OPC are typical of cementitious materials. Besides, it was observed that the finer particles of ordinary Portland cement (OPC) shown in Table 1 are poor and unrecorded; it implies that OPC particles were poorly graded.…”

“…In China, a total surface waste of 14.6 billion tons and about 1.28 billion m 3 of goafs are left underground, which brings out serious environmental and security problems [1][2][3]. As perceived by some observers, 28 provinces, including districts and cities, are affected and show direct and side effects on the surrounding environment, allowing us to keep in mind that environmental protection and security of resources are national policy needs and concerns.…”