scholarly journals Analysis of the Sedimentation Characteristics of Ultrafine Tailings Based on an Orthogonal Experiment

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Chang-hong Li ◽  
Yue-qi Shi ◽  
Peng Liu ◽  
Ning Guo
Keyword(s):  
Orthogonal Experiment ◽  
Friction Angle ◽  
Test Method ◽  
Optimum Dose ◽  
Polyaluminum Chloride ◽  
Factors Affecting ◽  
Object A ◽  
Optimal Ratio ◽  
Orthogonal Test Method ◽  
Polyferric Sulfate

Due to continuous improvements in the beneficiation process, the size of tailings has decreased. In many mines, more than 50% of the total tailings are finer than 74 μm. Ultrafine tailings exhibit a slow settling velocity and uneven settling, which pose new challenges to the safety and stability of tailings dams. In this paper, ultrafine iron tailings from the Makeng Iron Mine in Longyan City, Fujian Province, were used as the research object. A four-factor, three-level orthogonal test method was used to study the sedimentation characteristics of ultrafine tailings with four common curing agent materials, including polyacrylamide, polyaluminum chloride, polyaluminum sulfate, and polyferric sulfate. The results show that when the pulp concentration is 30%, the polyacrylamide is cationic and the molecular weight is 10 million, the optimal content of the flocculant is 3‰, the optimum dose of the polyaluminum chloride with a content of 28 is 0.1‰, the optimum dose of polyaluminum sulfate is 1‰, and the optimum dose of polymeric ferric sulfate is 1‰. When the flocculant is mixed according to the proportion of 2‰ polyacrylamide, 0.05‰ polyaluminum chloride, 1‰ polyaluminum sulfate, and 1.0‰ polyferric sulfate, the sedimentation speed of the ultrafine tailings is fast, and the supernatant liquid is clear. The results of multivariate nonlinear regression analysis of the sedimentation curve show that the primary and secondary factors affecting sedimentation are polyacrylamide > polyaluminum sulfate > polyaluminum chloride > polyferric sulfate. When the optimal ratio is applied, the cohesion (c) of ultrafine tailings increases from 27 kPa to 68.75 kPa and the internal friction angle (φ) increases from 25.53° to 27.53°, which shows that the shear strength improves and the stability of the tailings dam increases. The economic analysis of the composite flocculant with the optimal ratio shows that the flocculant with the optimal proportion has an obvious economic advantage over polyacrylamide alone.

Analysis of the Sensitivity of Impact Factors on the Stability of Expansion Freeway Slope

2013 ◽  
Vol 405-408 ◽  
pp. 1830-1833 ◽  
Author(s):  
Gen Chuan Luo ◽  
Zhong Ming He ◽  
Xin Tong Zhao
Keyword(s):  
Slope Angle ◽  
Soil Layer ◽  
Friction Angle ◽  
Test Method ◽  
Impact Factors ◽  
Factors Affecting ◽  
Orthogonal Test Method ◽  
Main Factors ◽  
The Stability ◽  
Method Analysis

By analysis its own characteristics of Reconstruction and Extension freeway slope, summary and presents the main factors affecting slope stability; then use orthogonal test method, analysis the result by Range Method, it indicated that the sensibility of impact factors on the Stability of Reconstruction and Extension Freeway Slope was in the following order: the slope angle after excavation, cohesion, weight of soil layer, internal friction angle, the slope angle before excavation, Cable length, Cable spacing.

Optimum Grinding Parameters for CRYSTOE and NEOPARIES Based on Orthogonal Experiment

2013 ◽  
Vol 274 ◽  
pp. 61-64
Author(s):  
Li Xu ◽  
Hong Dong Li ◽  
Li Li Zhou
Keyword(s):  
Orthogonal Experiment ◽  
Processing Parameters ◽  
Orthogonal Test ◽  
Test Method ◽  
Quality Requirements ◽  
Military Equipment ◽  
Optimal Processing ◽  
Orthogonal Test Method ◽  
New Material ◽  
Very High

Abstract. As a new material ,CRYSTOE and NEOPARIES are widely used in aerospace and military equipment, its surface quality requirements is very high. CRYSTOE and NEOPARIES disc convex machining has done a lot of trials. And analyzed the experimental data by using Orthogonal test method get the optimal processing parameters. It also provide a reference for future processing tests.

The Adhesion and Antimicrobial Properties of Nano Silver/Chitosan Composite Membrane in Orthogonal Research

2015 ◽  
Vol 713-715 ◽  
pp. 2937-2941
Author(s):  
Peng Qin ◽  
Gang Yu ◽  
Pi Mao Chen ◽  
Chuan Xin Qin ◽  
You Jun Ou
Keyword(s):  
Composite Materials ◽  
Orthogonal Experiment ◽  
Ultrasonic Method ◽  
Circle Method ◽  
Antimicrobial Properties ◽  
Inhibition Zone ◽  
Orthogonal Test ◽  
Test Method ◽  
Composite Columns ◽  
Orthogonal Test Method

Research the nanosilver and other composite materials with the chitosan in the best composition with orthogonal test method. According to the best use concentration of nanosilver and composite materials carry out the orthogonal experiment. By using the ultrasonic method test the adhesion strength between chitosan membrane and the breeding net through calculating the loss of the membrane. With bacteriostatic circle method to determine the bacteriostatic effect of membrane. The results show that the main factors influence the adhesion of membrane and the effectiveness of bacteriostatic is adhesives and nanosilver. The orthogonal experiment results show that the optimum conditions of film forming as follows: the adhesion agent A3% , adhesion reagent B3% ,nanosilver solution 2% nanoantibacterial powder 3% ,tea saponin solution 60 mg/L. Under these conditions, the loss of the membranewas14.6%, the inhibition zone was 2.35cm. Orthogonal test was applied to the ratio of composite materials can get the best composite columns. Creating a better performance of target product and has a promising prospect for practical application.

Searching for the Central Coordinates of Critical Failure Surface Based on Simplified Bishop Method

2012 ◽  
Vol 170-173 ◽  
pp. 1043-1047
Author(s):  
Lei Li ◽  
Meng Xi Zhang
Keyword(s):  
Failure Surface ◽  
Friction Angle ◽  
Orthogonal Test ◽  
Test Method ◽  
Unit Weight ◽  
Stability Factor ◽  
Straight Line ◽  
Orthogonal Test Method ◽  
Critical Failure Surface ◽  
Straight Line Method

Central coordinates of the critical failure surface of uniform slope are searched by using procedural Simplified Bishop equation. Comparison of stability factor K calculated by the program with existing ones shows that the program is available. The sensibilities of the factors influencing on slope stability are analyzed by orthogonal test method. The results indicate that the sensibilities of the factors are as follows in their magnitude order: slope height H, ratio m, internal friction angle φ, cohesion c and unit weight γ. Central coordinates of the critical failure surface is located at center of the K contours, the results of Fellenius straight-line method and Taylor chart method are different from the program’s. The fitting curves of central coordinates change with γtanφ/c and the corrected values are obtained based on a large number of calculations. It can be conveniently used in actual engineering.

Study on the Optimum Degradation Conditions of Combination Remediation on Petroleum-Contaminated Soil by Cold-Adapted Bacterial and Winter Wheat

2012 ◽  
Vol 209-211 ◽  
pp. 1087-1092
Author(s):  
Xin Zhang ◽  
Hong Qi Wang ◽  
Qian Wang ◽  
Ya Fu Zhang
Keyword(s):  
Winter Wheat ◽  
Petroleum Hydrocarbons ◽  
Oil Content ◽  
Degradation Rate ◽  
Orthogonal Experiment ◽  
Test Method ◽  
Cold Adapted ◽  
Orthogonal Test Method ◽  
Petroleum Contaminated Soil ◽  
The Impact

Through greenhouse pots experiments, an orthogonal test method was employed here to study the optimum degradation conditions of cold-adapted degrading bacterial and the winter wheat. This orthogonal experiment selected four influencing factors: oil content, bacteria amount, soil moisture content and fertilizer. The results showed that in different stages, the optimum degradation conditions were different. Oil content and the bacterial amount were the two most important factors that influenced the degradation of petroleum hydrocarbons. The impact of fertilizers on the degradation rate increased with time, while water content on the degradation rate decreased with time.

scholarly journals The Effect of 3D Printing Process Parameters on the Mechanical Properties of PLA Parts

2021 ◽  
Vol 2133 (1) ◽  
pp. 012026
Author(s):  
Jiangmin Xu ◽  
Fan Xu ◽  
Ge Gao
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Optimal Level ◽  
Test Method ◽  
Thermal Shrinkage ◽  
Compressive Property ◽  
Molding Process ◽  
Factors Affecting ◽  
Molded Part ◽  
Orthogonal Test Method

Abstract Taking the PLA molded by FDM as the research object, the influence of various process parameters on mechanical properties is investigated through comparative experiments, which provides reference and help for the promotion and application of FDM molding technology. During the molding process, the PLA material undergoes the process of melting to solidification, thus the performance of the molded part is worse than the original due to thermal shrinkage and other reasons. To improve the quality and mechanical properties of the molded parts, the experiment is designed using an orthogonal test method in parallel with nine different sets of process parameters (layer thickness, build direction, filling speed, and infill density, etc.). Ultimately, the mechanical properties of PLA are tested and the results are analyzed respectively to determine the main factors affecting the mechanical properties and their optimal level combination. Among them, fill rate is the crucial factor in compressive property, while build direction has a significant effect on surface roughness, tensile property and bending property.

Study on Driver’s Reaction Time of Emergency Braking

2013 ◽  
Vol 779-780 ◽  
pp. 925-928
Author(s):  
Gui Fan Zhao ◽  
Shen Si Wang ◽  
Na Yang ◽  
Ke Qing ◽  
Ming Min Liu
Keyword(s):  
Reaction Time ◽  
Detection System ◽  
Driving Behavior ◽  
Orthogonal Test ◽  
Test Method ◽  
Factors Affecting ◽  
Emergency Braking ◽  
Reaction Characteristics ◽  
Orthogonal Test Method ◽  
Different Levels

From the view of driver’s driving behavior and reaction characteristics, the factors affecting driver’s reaction time are comprehensively analyzed. Then design and prepare driver’s reaction time of emergency braking detection system on both hardware and software by using MCU. And according to the factors affecting driver’s reaction time, the reaction time of emergency braking of different gender drivers in different conditions is tested by using orthogonal test method. From the experimental results, the degree of influence of different factors and different levels on driver’s reaction time is obtained and this provides a reference for safety driving.

Sensitivity Analysis of the Influences of Rock Mechanical Parameters on the Deformation of Underground Caverns

2013 ◽  
Vol 275-277 ◽  
pp. 262-268 ◽  
Author(s):  
Fang Fang Chen ◽  
Zhi Qiang Zhang ◽  
Ning Li
Keyword(s):  
Poisson Ratio ◽  
Pressure Coefficient ◽  
Numerical Test ◽  
Friction Angle ◽  
Test Method ◽  
Mechanical Parameters ◽  
Factors Affecting ◽  
Underground Caverns ◽  
Engineering Designs ◽  
Rock Mechanical Parameters

The Main factors affecting the stability of underground caverns are selected, including the rock mechanical parameters (elastic modulus, Poisson ratio, cohesion and internal friction angle) and initial ground stress parameter (lateral pressure coefficient). Numerical test method is adopted to analyze each parameter’s sensitivity to surrounding rock displacement. Sensitivity formula making each values comparable is established. The sensitivity distribution laws are obtained, and then each parameter’s quantitative effect on displacement is discussed. This work has prominent guiding significance to engineering designs.

scholarly journals Analysis of Factors Affecting Creep of Wood–Plastic Composites

Forests ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1146
Author(s):  
Li Feng ◽  
Weiren Xie
Keyword(s):  
Relative Humidity ◽  
Creep Strain ◽  
Test Method ◽  
Creep Tests ◽  
Wood Plastic Composites ◽  
Factors Affecting ◽  
Plastic Composite ◽  
Plastic Composites ◽  
Significant Difference ◽  
Orthogonal Test Method

Wood–plastic composite (WPC) materials are mainly used as flooring in buildings or as structural load-bearing plates, and will undergo creep deformation during use, resulting in structural failure and safety problems. Therefore, this work adopted the orthogonal test method to carry out creep tests on wood–plastic composites. We used the range method and variance analysis method to process the creep data and analyze the influence of the load, temperature, and relative humidity on the creep strain in specimens of wood–plastic composites. The results showed that the creep strain of the WPC specimens changed significantly with a change in the load stress, while a change in relative humidity had no significant effect on the creep strain. When the relative humidity was increased from 55% to 65%, the creep strain increased by 0.03%, but when the temperature was increased from 30 °C to 35 °C, there was no significant difference in the creep strain. However, when the temperature was increased from 30 °C to 40 °C and from 35 °C to 40 °C, a significant difference in the creep strain of the WPC specimens was observed.

Customer’s satisfaction on service quality at Vietnam Technological and Commercial Joint Stock Bank – An Giang Branch

2020 ◽  
Vol 4 (3) ◽  
pp. First
Author(s):  
Tran Minh Hieu ◽  
Nguyen Duong Ngoc Mai Chi
Keyword(s):  
Customer Satisfaction ◽  
Service Quality ◽  
Test Method ◽  
Quality Of Services ◽  
Factors Affecting ◽  
Factors Influencing ◽  
Alpha Reliability ◽  
Survey Results ◽  
Development Orientation

This study applied SERVQUAL scale of Parasuraman et al to measure factors affecting customer satisfaction on service quality at Vietnam Technological and Commercial Joint Stock Bank - An Giang Branch (Techcombank An Giang). The study was conducted to survey 207 customers who have been using the service at Techcombank An Giang. The survey results were analyzed by the Cronbach's Alpha reliability test method, then used Exploratory factor analysis (EFA) to verify and evaluate the scale of service quality. The results of the regression analysis show that customer's satisfaction about service quality at Techcombank An Giang includes four factors: The factor with the highest level is the Empathy with Beta = 0.253, the second of factor is the Responsibility with Beta = 0.248, ranked third in the influence level is the Tangible with Beta = 0.235, and the lowest impact level is the Reliability with Beta = 0.144. The research also uses statistical methods to describe and test the differences of demographic factors with customer's satisfactionon service quality.The analysis results show that there is no difference between customer's satisfaction on service quality and factors such as gender, age, income, number of transaction banks, regular transaction banks, and time to use the service at Techcombank An Giang. Through the research results, the author would like to propose some ideas to improve the quality of services, thereby attracting new customers and importantly, keeping traditional customers because the development orientation of Techcombank is to take care of old customers to cross sell other products of the bank. The Stud results offer a basis for the branch to identify the factors influencing customer satisfaction on their service quality, thereby having an appropriate strategy to improve customer satisfaction.

Sign in / Sign up

Export Citation Format

Share Document