Particle Flow Characteristics and Transportation Optimization of Superfine Unclassified Backfilling

Abstract

Abstract:In order to investigate the high volume fraction problem of the solid phase in superfine unclassified backfilling pipeline transportation, characteristic parameters were obtained by fitting to test data with an R-R particle size distribution function; then, a Euler dense-phase DPM (Discrete phase model) model was established by applying solid-liquid two-phase flow theory and the kinetic theory of granular flow (KTGF). The collision and friction of particles were imported by the UDF (User-define function) function, and the pipeline fluidization system, dominated by interphase drag forces, was analyzed. The best concentration and flow rate were finally obtained by comparing the results of the stress conditions, flow field characteristics, and the discrete phase distributions. It is revealed that reducing the concentration and flow rate could control pressure loss and pipe damage to a certain degree, while lower parameters show negative effects on the transportation integrity and backfilling strength. Indoor tests and field industrial tests verify the reliability of the results of the numerical simulations. Research shows that the model optimization method is versatile and practical for other, similar, complex flow field working conditions.

Utilization of Foaming Technology in Cemented Paste Backfill of High-Mud Superfine Unclassified Tailings

“…After being uniformly mixed and stirred, TFB can be considered as a homogeneous full-pipe flow and treated as an incompressible steady flow [18]. The Euler method was selected as the slurry model, the inlet boundary of the vertical duct as velocity inlet, and the outlet boundary of the horizontal duct as outflow [19].…”

Effect of Incorporating Waste Limestone Powder into Solid Waste Cemented Paste Backfill Material

“…As a relatively new mine waste management technology, CPB has been extensively applied in underground mine operations around the world because of its significant environmental, technical, and economic benefits [11][12][13][14]. Besides, as the mining industry moves deeper into the ground, the Appl.…”

Operational process simulation and optimization of a continuous-discharge system in a backfilling system

“…With the implementation of a sustainable development strategy in China, green mining technology has become the primary focus of technical innovation in mining. [1][2][3][4] Because of its safety, high recovery ratio and low impact on the surrounding environment, the backfill mining method has caused more mines to build filling systems to implement backfill mining. [5][6] As an integral part of a filling system, vertical silos (VSs) can load, store and discharge tailings slurry (TS).…”