The equivalent radius R on the overburden unit was 300 mm, working with a volume equivalent approach. Gravity ore Metals 2021, 11, x FOR PEER Review five of 17 dropping was adopted to produce the corresponding collapsed ore move beneath the action of gravity.Figure 3. Schematic with the model: (a) schematic of model size, m; (b) 2D numerical model diagram. Figure three. Schematic of the model: (a) schematic of model size, m; (b) 2D numerical model diagram.A total of 41,331 balls are discovered inside the model, exactly where 35,093 red balls represent the A total of 41,331 balls are found inside the model, where 35,093 red balls represent the ore, and 6238 N-Acetylcysteine amide Biological Activity yellow balls represent the waste rock. The particle unit diagram of your 2D ore, and 6238 yellow balls represent the waste rock. The particle unit diagram in the 2D numerical simulation of your ore CC 122 custom synthesis drawing scheme is shown in Figure 3b. numerical simulation on the ore drawing scheme is shown in Figure 3b. PFC2D modeling demands debugging micromechanical parameters. The The micromePFC2D modeling requires debugging micromechanical parameters. micromechanical parameters assumed by the model are initially assigned to conduct numerical tests tests chanical parameters assumed by the model are initial assigned to conduct numerical and and then are matched together with the macro test parameters obtained from laboratory tests to enable continuous debugging. These micromechanical parameters could be applied to the numerical calculation when the calculated results are constant together with the laboratory test outcomes [26,27]. The size in the 3D ore drawing numerical model adopted within this studyMetals 2021, 11,5 ofthen are matched with all the macro test parameters obtained from laboratory tests to enable continuous debugging. These micromechanical parameters is often applied to the numerical calculation when the calculated outcomes are consistent with the laboratory test benefits [26,27]. The size from the 3D ore drawing numerical model adopted in this study was constant using the laboratory test, as well as the contact-stiffness model was adopted for the particle interaction model. The modeling parameters of this model primarily integrated ore and rock particle radius, standard stiffness, shear stiffness, friction coefficient, density, and color [28,29]. The micromechanical parameters in Table 1 are consistent with all the macroscopic mechanical parameters soon after repeated debugging.Table 1. Micromechanical parameters with the model. Particle Kind Ore rock Typical Particle Size/m 0.2 0.three Regular Stiffness/N -1 1.2 108 1.0 108 Tangential Stiffness/N -1 1.two 108 1.0 108 Friction Coefficient 0.1 0.two Density/ kg -3 4000 2700 Colour Red yellowBefore ore drawing, the cutoff condition of simulated ore drawing was determined based on the principle of equal ore volume dilution ratio. The particular calculation procedure of the ore drawing cutoff situation is expressed as follows: Ci = Cy Ck Wk Wy W W W = Wk Wy Wy = 1.67Wk (8) (9) (ten)In this equation, as outlined by the actual situation from the mine, Ci may be the cutoff ore grade, 18 ; Ck will be the ore geological grade, 48 ; Cy could be the surrounding rock grade, 0; Wk will be the existing ore weight; and Wy would be the present rock weight. The ore is mined by totally free falling. Equation (ten) could be obtained from Equations (8) and (9), when the ratio on the waste rock mass for the ore mass reached 1.67, the ore was stopped. The Metals 2021, 11, x FOR PEER Evaluation 6 an drawing process with sectional height and route spacing of 19 m 20 m was chosen asof 17 example, as shown in Figure four.F.
