scholarly journals Experimental Study on Rheological Properties and Strength Variation of High Concentration Cemented Unclassified Tailings Backfill

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Shijiao Yang ◽  
Xing Xing ◽  
Shuai Su ◽  
Fulin Wang
Keyword(s):  
Experimental Study ◽  
Rheological Properties ◽  
Underground Mining ◽  
Chemical Properties ◽  
Solid Content ◽  
High Concentration ◽  
Backfill Mining ◽  
Two Factors ◽  
Unclassified Tailings ◽  
Mining Design

This experimental study presents the rheological properties and strength characteristics of cemented unclassified tailings backfill (CUTB). The particle size distribution and chemical properties of tailings from the Shizhuyuan lead-zinc mine were examined experimentally. A series of rheological properties and uniaxial compressive strength (UCS) tests were conducted to study the relations between the rheological properties of CUTB and two factors of cement-tailings ratio (c/t) and solid content (SD). The two-factor nonrepetitive analysis of variance (ANOVA) method was used to study the sensitivity of rheological properties to two factors of c/t and SD. Relations between UCS performance of CUTB and c/t, SD, and curing time (CT) were discussed. Results indicate that CUTB samples exhibit obvious shear thinning characteristics and the rheological process is the result of multiple rheological model composites. Yield stress and viscosity of CUTB increase with the increase of SD and c/t as quadratic. The solid content is the most important factor for the rheological properties of CUTB, followed by c/t. UCS of CUTB increases exponentially with the increase of SD and increases with c/t as quadratic. The larger the ratio of c/t, the greater the influence of the CT on the increasing strength of CUTB. The smaller the c/t, the slower the increase of the CUTB’s strength with the increase of the SD. The findings of this study can provide the efficient mix proportion of backfill slurry for the backfill mining design, so as to have better performance of the underground mining structure and reduce the cost of backfill mining.

ANALISIS MUTU MINUMAN INSTAN BERBAHAN DASAR BUAH MENGKUDU (Morinda citrifolia L) DAN JAHE MERAH (Zingiber officinale rosc)

2019 ◽  
Vol 5 ◽  
pp. 8
Author(s):  
Andi Citra Islamiah ◽  
Husain Syam ◽  
Andi Sukainah
Keyword(s):  
Experimental Study ◽  
Antioxidant Activity ◽  
Chemical Properties ◽  
Zingiber Officinale ◽  
Morinda Citrifolia ◽  
Test Results ◽  
Randomized Design ◽  
Two Factors ◽  
Completely Randomized Design ◽  
Red Ginger

This study aims to determine the chemical properties of instant drinks produced and the best concentration by adding noni and red ginger to the manufacture of instant drinks based on organoleptic test results. This research is an experimental study with an experimental design that is used is Factorial Completely Randomized Design (CRD) which consists of two factors, namely the factor A noni fruit, namely: 100 g, 200 g, 300 g. The red ginger B factor is: 75 g, 100 g, 125 g. The chemical analysis results were the highest water content with the addition of 300 g noni fruit concentration 2,8678 and 125 ginger concentration 2,9456, the highest antioxidant activity with the addition of 300 g noni fruit concentration 71,100 and red ginger concentration 125 g 70,0178, and from the alkaloid test all treatments in instant drinks contain positive alkaloids. The results of organoleptic color, aroma and taste are preferred by panelists with the addition of 100 g of noni fruit and the concentration of red ginger 125 g.

scholarly journals Waste Tire Particles and Gamma Radiation as Modifiers of the Mechanical Properties of Concrete

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Eduardo Sadot Herrera-Sosa ◽  
Gonzalo Martínez-Barrera ◽  
Carlos Barrera-Díaz ◽  
Epifanio Cruz-Zaragoza
Keyword(s):  
Mechanical Properties ◽  
Gamma Radiation ◽  
Chemical Properties ◽  
Plain Concrete ◽  
Cement Matrix ◽  
Portland Cement Concrete ◽  
High Concentration ◽  
Good Tool ◽  
Waste Tire ◽  
Physical And Chemical

In polymer reinforced concrete, the Young’s modulus of both polymers and cement matrix is responsible for the detrimental properties of the concrete, including compressive and tensile strength, as well as stiffness. A novel methodology for solving such problems is based on use of ionizing radiation, which has proven to be a good tool for improvement on physical and chemical properties of several materials including polymers, ceramics, and composites. In this work, particles of 0.85 mm and 2.80 mm obtained from waste tire were submitted at 250 kGy of gamma radiation in order to modify their physicochemical properties and then used as reinforcement in Portland cement concrete for improving mechanical properties. The results show diminution on mechanical properties in both kinds of concrete without (or with) irradiated tire particles with respect to plain concrete. Nevertheless such diminutions (from 2 to 16%) are compensated with the use of high concentration of waste tire particles (30%), which ensures that the concrete will not significantly increase the cost.

Materials and Photosensor Devices with High Radiation Stability

2015 ◽  
Vol 1117 ◽  
pp. 107-113 ◽  
Author(s):  
Ilariy Rarenko ◽  
Dmytro Korbutyak ◽  
Volodymyr Koshkin ◽  
Boris Danilchenko ◽  
Leonid Kosyachenko ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Metal Layer ◽  
Chemical Properties ◽  
Radiation Stability ◽  
Reactor Irradiation ◽  
High Concentration ◽  
High Radiation ◽  
Cubic Crystal ◽  
Impurity Atoms ◽  
Mixed Reactor

Semiconductor Hg3In2Te6 crystals and their analogous are solid solutions of In2Te3 and HgTe. Hg3In2Te6 crystals are congruently melted as chemical compound. Like In2Te3 the Hg3In2Te6 crystal has cubic crystal lattice with stoichiometric vacancies in their crystal structure. The electroconductivity, photoconductivity, mechanical, chemical properties of the crystals do not deteriorate after their irradiation by γ-photons with energies up to 1 MeV and doses up to 1018 cm-2 , by electrons with energies up to 300 MeV and doses up to 1019 cm-2 and by mixed reactor irradiation (filtered slow neutrons) with doses up to 1019 cm-2 [1,2]. This feature is determined by high concentration (~1021 cm-3) of stoihiometric vacancies (Vs) in crystal structure, where every third In-cation node is empty. These Vs are electroneutral, they capture all impurity atoms in these crystals and kept them in electroneutral state too. On the other hand this feature doesn't allow to form direct p-n junctions in these crystals by introducing the impurities. However, we have developed p-n junction analogues in form of Schottki diodes and corresponding photodiodes with semitransparent metal layer on single crystal Hg3In2Te6 substrate that allows irradiation to get into active region preserving this way all the advantages compared to p-n junction.

scholarly journals An experimental study on the flocculating settling of unclassified tailings

PLoS ONE ◽  
2018 ◽  
Vol 13 (9) ◽  
pp. e0204230 ◽  
Author(s):  
Jiwei Bian ◽  
Hao Wang ◽  
Chongchun Xiao ◽  
Deming Zhang
Keyword(s):  
Experimental Study ◽  
Unclassified Tailings

Anaerobic treatment and biogas recovery for sago wastewater management using a fluidized bed reactor

2001 ◽  
Vol 44 (6) ◽  
pp. 141-147 ◽  
Author(s):  
R. Saravanane ◽  
D. V.S. Murthy ◽  
K. Krishnaiah
Keyword(s):  
Fluidized Bed ◽  
Large Scale ◽  
Fluidized Bed Reactor ◽  
Anaerobic Treatment ◽  
Solid Content ◽  
Treated Wastewater ◽  
Maximum Efficiency ◽  
Cow Dung ◽  
Wastewater Management ◽  
High Concentration

Starch manufacturing industrial units, such as sago mills, both at medium and large scale, suffer from inadequate treatment and disposal problems due to high concentration of suspended solid content present in the effluent. In order to investigate the viability of treatment of sago effluent, a laboratory scale study was conducted. The treatment of sago effluent was studied in a continuous flow anaerobic fluidized bed reactor. The start-up of the reactor was carried out using a mixture of digested supernatant sewage sludge and cow dung slurry in different proportions. The effect of operating variables such as COD of the effluent, bed expansion, minimum fluidization velocity on efficiency of treatment and recovery of biogas was investigated. The treated wastewater was analysed for recycling and reuse to ensure an alternative for sustainable water resourse management. The maximum efficiency of treatment was found to be 82% and the nitrogen enriched digested sludge was recommended for agricultural use.

An experimental study of rheological properties and stability characteristics of biochar-glycerol-water slurry fuels

2016 ◽  
Vol 153 ◽  
pp. 37-42 ◽  
Author(s):  
Pengfei Liu ◽  
Mingming Zhu ◽  
Zhezi Zhang ◽  
Yee-kwong Leong ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Rheological Properties ◽  
Glycerol Water ◽  
Water Slurry

Theoretical and experimental study on the uniformity of reflective high concentration photovoltaic system with light funnel

2019 ◽  
Vol 133 ◽  
pp. 893-900 ◽  
Author(s):  
Cheng-Long Wang ◽  
Jing-Hu Gong ◽  
Jia-Jie Yan ◽  
Yuan Zhou ◽  
Duo-Wang Fan
Keyword(s):  
Experimental Study ◽  
Photovoltaic System ◽  
High Concentration

Experimental Study of CO2 Sequestration Using Glycinate-TEA

2014 ◽  
Vol 522-524 ◽  
pp. 396-400 ◽  
Author(s):  
Wei Feng Zhang ◽  
Jian Hui Shu
Keyword(s):  
Experimental Study ◽  
Absorption Capacity ◽  
High Concentration ◽  
Low Concentration

The experimental study on the mechanism of CO2 absorption and desorption was tested by two kinds of glycinate (SG and PG) with TEA. The absorption and regeneration of CO2 by mixed absorption liquid were tested and compared with each other. The results showed that a low concentration of TEA in the SG and PG increased CO2 absorption capacity of mixed absorption solution. Addin more TEA on PG or SG lowered CO2 absorption capacity of mixed absorption solution. Desorption of PG didnt change with TEA. The low concentration of TEA had a role in promoting the desorption of mixed absorption solution (SG+TEA), and the high concentration of TEA inhibited the desorption of mixed absorption solution (SG+TEA).

Sign in / Sign up

Export Citation Format

Share Document