scholarly journals Comprehensive Benefit Evaluation of Cemented Paste Backfill in the Mining Industry

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Yan Li
Keyword(s):  
Environmental Economic ◽  
Social Impact ◽  
Mining Industry ◽  
Economic Benefits ◽  
Social Benefits ◽  
Equation Modeling ◽  
Cemented Paste Backfill ◽  
Comprehensive Benefit ◽  
Paste Backfill ◽  
Resource Environment

With the increasing scrutiny on tailings management and requirements of the ground subsidence control, both the academia and industry are highly advocating the utilization of cemented paste backfill (CPB) in the mining industry. Literature review has shown that there are some studies conducted to evaluate the ecological environment, economic development, and social impact of mining. However, a comprehensive study about the economic benefits, resource benefits, environmental benefits, and social benefits of CPB is still lacking. This study aims to present a comprehensive benefit index system for CPB from four aspects, i.e., economy, resource, environment, and society. Questionnaires from experts and the mining industry using CPB technology were collected, and structural equation modeling (SEM) was used for data analysis. The relationships between economy, resource, environment, and society were analyzed. The results show that resource benefits have the greatest impact on the comprehensive benefit of CPB in the mining industry, followed by environmental, economic, and social benefits. According to relevance ranking, resource benefits are positively correlated with social, environmental, and economic benefits, whereas environmental, resource, and social benefits have correlation with economic benefits in turn. Therefore, resource, environmental, economic, and social benefits in order directly affect the comprehensive benefit of CPB on the basis of the influencing degree. Moreover, resource, environmental, and social benefits indirectly affect the comprehensive benefit of CPB. The research findings of this study would help the mining industry popularize the CPB technology and promote the sustainability and cleaner production of the mining industry.

scholarly journals Insight into Saturated Hydraulic Conductivity of Cemented Paste Backfill Containing Polycarboxylate Ether-Based Superplasticizer

Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 93
Author(s):  
Sada Haruna ◽  
Mamadou Fall
Keyword(s):  
Hydraulic Conductivity ◽  
Environmental Performance ◽  
Mining Industry ◽  
Design Criterion ◽  
Saturated Hydraulic Conductivity ◽  
Curing Temperature ◽  
Partial Replacement ◽  
Cemented Paste Backfill ◽  
Curing Conditions ◽  
Paste Backfill

Recycling of tailings in the form of cemented paste backfill (CPB) is a widely adopted practice in the mining industry. Environmental performance is an important design criterion of CPB structures. This environmental performance of CPB is strongly influenced by its saturated hydraulic conductivity (permeability). Superplasticizers are usually added to improve flowability, but there is a limited understanding of their influence on the hydraulic properties of the CPB. This paper presents new experimental results on the variations of the hydraulic conductivity of CPB containing polycarboxylate-based superplasticizer with different compositions and curing conditions. It is found that the hydraulic conductivity of the CPB decreases with the addition of superplasticizer, which is beneficial to its environmental performance. The reduction is largely attributable to the influence of the ether-based superplasticizer on particles mobility and cement hydration. Moreover, both curing temperature and time have correlations with the hydraulic conductivity of CPB containing superplasticizer. In addition, the presence of sulfate and partial replacement of PCI with blast furnace slag reduces the hydraulic conductivity. The variations are mainly due to the changes in the pore structure of the CPB. The new results discussed in this manuscript will contribute to the design of more environmental-friendly CPBs, which is essential for sustainable mining.

scholarly journals Shear Properties of Cemented Paste Backfill under Low Confining Stress

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Andrew N. Pan ◽  
Murray W. F. Grabinsky ◽  
Lijie Guo
Keyword(s):  
Shear Strength ◽  
Mining Industry ◽  
Binder Content ◽  
Environmental Benefits ◽  
Direct Shear ◽  
Cemented Paste Backfill ◽  
Curing Time ◽  
Confining Stress ◽  
Strain Property ◽  
Paste Backfill

Cemented paste backfill (CPB) plays an important role in the mining industry due to safety, cost efficiency, and environmental benefits. Studies on CPB have improved the design and application of paste backfill in underground mines. Direct shear is one of the most fundamental parameters for assessing backfill strength. This study harnesses direct shear tests to explore the low confining stress behavior of CPB. We perform all the tests in a standard apparatus on the combination of three binder contents of 4.2%, 6.9%, and 9.7% CPB with four curing times of 3, 7, 14, and 28 days, respectively. The applied confining stress levels vary in a range according to the in situ regime. Results are presented by strength envelope, stress-strain property, and shear strength with curing time and binder content. The data suggest that the shear strength follows the Mohr–Coulomb envelope in which the shear strength and behavior are time and binder content dependent. In addition, the results show that shear strength is strongly related to the binder content than the curing time, namely, the higher the degree of binder hydration, the higher the cementation binding force between CPBs.

Impact of PAU Tree Growers Association of Punjab in Terms of Economic, Personal, Technical and Social Benefits

2020 ◽  
pp. 560-564
Keyword(s):  
Sample Size ◽  
Economic Benefits ◽  
Social Benefits ◽  
Interview Schedule

The present study was undertaken to determine the benefits derived by the respondents being a member of the PAU Tree Growers Association with a sample size of a total of 80 members of the association. The data were collected using an interview schedule pertaining to the benefits derived by the members. The results of the study revealed that the majority of the respondents had derived high technical benefits (96.25 percent), high personal benefits (86.25 percent), high social benefits (70 percent), and medium economic benefits (51.25 percent). Between the various benefits derived by them, technical benefits emerged as the major benefits (mean score =142.4) followed by social benefits (mean score=140.45), personal benefits (mean score=133), and economic benefits (mean score=98.44). Overall the members obtained high benefits from the association (56.25 percent).

Global challenges to functioning of precious gemstones market

2019 ◽  
pp. 15-19
Author(s):  
Maryna Khmara
Keyword(s):  
Social Impact ◽  
Negative Impact ◽  
Economic Benefits ◽  
Small Enterprises ◽  
Ecological Responsibility ◽  
Global Challenges ◽  
Production And Consumption ◽  
Managerial Strategies ◽  
The Impact ◽  
Complicated Nature

The peculiarities of gemstone market functioning under the impact of globalization are examined. Modern condition of financial stabilization in world is defined and main features of gemstones are outlined. Negative impact of illegal market on socio-economic development of countries, namely on revenues to the country’s budget from the business, is revealed. The importance of the problem of transferring most of gemstones processing operations beyond the countries of production is emphasized. Poor public control over the circulation of precious stones is proven. The challenges are substantiated to be aggravating under the impact of globalization. The diamonds market, which has peculiar high demand, is analyzed: diamonds and derivatives account for 85% of global turnover. Application of managerial strategies for gemstones market to efficiently use resources is defined to be complicated by the fact that managerial strategies impact the high cost of product items and its variability; unique features; intangible qualities; complicated processing. More environmentally friendly production and social responsibility are confirmed to have impact on forming of demand on gemstones. Investment attractiveness of gemstones, except for diamonds, is proven to be low. Condition of production and consumption of diamonds is analyzed. Development condition of the market segment – non-diamonds gemstones – is shown. The activity of small enterprises and households engaged in gemstones production is confirmed to be characterized by chaotic and complicated nature of broker networks, leading to aggravated global challenges. The paper defines that expansion of spectrum and emergence of new opportunities for illegal activity, reduced income and loss of other types of economic benefits, growing negative ecological and social impact, growing exploitation of workers at illegal enterprises remain to be the global challenges of gemstones market functioning. The author suggests increasing of social and ecological responsibility of business, strengthening of the state regulating functions and promotion of gemstones market legalization in order to reduce the challenges.

Effects of temperatures and pH values on rheological properties of cemented paste backfill

2021 ◽  
Vol 28 (6) ◽  
pp. 1707-1723
Author(s):  
Qin-li Zhang ◽  
Yi-teng Li ◽  
Qiu-song Chen ◽  
Yi-kai Liu ◽  
Yan Feng ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Cemented Paste Backfill ◽  
Ph Values ◽  
Paste Backfill

Recycling flue gas desulfurisation gypsum and phosphogypsum for cemented paste backfill and its acid resistance

2021 ◽  
Vol 275 ◽  
pp. 122170
Author(s):  
Shiyu Zhang ◽  
Yingliang Zhao ◽  
Hangxing Ding ◽  
Jingping Qiu ◽  
Zhenbang Guo
Keyword(s):  
Flue Gas ◽  
Acid Resistance ◽  
Cemented Paste Backfill ◽  
Paste Backfill
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