scholarly journals Effect of ultrasound on the flocculation-sedimentation and thickening of unclassified tailings

2020 ◽  
Vol 66 ◽  
pp. 104984
Author(s):  
Liyi Zhu ◽  
Wensheng Lyu ◽  
Peng Yang ◽  
Zhikai Wang
Keyword(s):  
Unclassified Tailings

scholarly journals Mesoscopic Seepage Simulation and Analysis of Unclassified Tailings Pores Based on 3D Reconstruction Technology

ACS Omega ◽  
2021 ◽  
Author(s):  
Baomeng Chang ◽  
Cuifeng Du ◽  
Mingkang Sun ◽  
Yifan Lin ◽  
Yuan Wang ◽  
...  
Keyword(s):  
3D Reconstruction ◽  
Unclassified Tailings

Experiments and Optimization of Mix Proportions for Cement Paste Backfill Materials with Extra-Fine Unclassified Tailings

2017 ◽  
Vol 744 ◽  
pp. 146-151
Author(s):  
Ming Qing Huang ◽  
Xiao Hui Liu ◽  
Hai Yong Cheng
Keyword(s):  
Cement Paste ◽  
Mass Concentration ◽  
Influential Factors ◽  
Range Analysis ◽  
Bleeding Rate ◽  
Orthogonal Experiments ◽  
Optimal Mix ◽  
Backfill Materials ◽  
Unclassified Tailings ◽  
Paste Backfill

To produce effective cement paste backfill materials at iron mines technologically and economically, orthogonal experiments of mix proportions with extra-fine unclassified tailings were carried out. The results of the range analysis showed that the sensitivity of influential factors to the slurry slump is sequentially mass concentration, tailing/rock ratio, and cement/(tailing+rock) ratio. The sensitivity to bleeding rate, concretion time and 28-day uniaxial compressive strength is sequentially mass concentration, cement/(tailing+rock) ratio and tailing/rock ratio. Relationships of paste properties and influential factors can be demonstrated with regression analysis. Additionally, the optimal mix proportion for cement paste backfill was obtained with 78% mass concentration, 7:3 tailing/rock ratio and 1:25 cement/(tailing+rock) ratio. The slump, bleeding rate, concretion time and R28 of the optimal mixture are 25.2 cm, 8.77%, 20.9 h and 1.29 MPa, respectively. The experimental results show a feasible way to produce the industry standard backfilling materials.

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

scholarly journals A Novel Prediction Model of Strength of Paste Backfill Prepared from Waste-Unclassified Tailings

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Haiyong Cheng ◽  
Shunchuan Wu ◽  
Xiaoqiang Zhang ◽  
Junhong Li
Keyword(s):  
Prediction Model ◽  
Prediction Models ◽  
Orthogonal Design ◽  
Influential Factors ◽  
Waste Rock ◽  
Strength Prediction ◽  
Strength Development ◽  
Local Conditions ◽  
Unclassified Tailings ◽  
Paste Backfill

Paste backfilling is an important support for the development of green mines and deep mining. It can effectively reduce a series of risks of underground goaf and surface tailings ponds. Reasonable strength of backfill is an effective guarantee for controlling ground stress and realizing safe mining function. Under the combination of complex materials and local conditions, ensuring the optimal design and effective proportion for paste backfill strength is the bottleneck problem that restricts the safety, economy, and efficiency of filling mining. The strength developing trend of paste backfilling prepared from waste rock and unclassified tailings has been studied. Different levels of cement contents, tailings-waste ratios, and slurry concentrations were investigated through orthogonal design to obtain the relationship between the UCS and the multi-influential factors. Combined with the experimental results and the previous strength prediction models, the waste rock-unclassified tailings paste strength prediction model was proposed. Introducing the water-cement ratio, the cement-tailings ratio, the amount of cement, and the packing density that characterizing the overall gradation of unclassified tailings and waste rock, as well as the curing time, a strength prediction model of multifactors was developed. Moreover, the microscopic structure of the paste prepared from waste-unclassified tailings was analyzed with an Environment Scanning Electron Microscope (ESEM), and the influence mechanism was ascertained. The weight coefficient of strength development is carded in this paper, and the strength model of unclassified tailings-waste paste considering five factors is obtained, which is of great significance to guide the mining engineering.

Fractal and microscopic quantitative characterization of unclassified tailings flocs

2021 ◽  
Vol 28 (9) ◽  
pp. 1429-1439
Author(s):  
Di Zheng ◽  
Wei-dong Song ◽  
Yu-ye Tan ◽  
Shuai Cao ◽  
Zi-long Yang ◽  
...  
Keyword(s):  
Quantitative Characterization ◽  
Unclassified Tailings

scholarly journals A Theoretical Model for the Rake Blockage Mitigation in Deep Cone Thickener: A Case Study of Lead-Zinc Mine in China

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Zhuen Ruan ◽  
Yong Wang ◽  
Aixiang Wu ◽  
Shenghua Yin ◽  
Fei Jin
Keyword(s):  
Coarse Particles ◽  
Cemented Paste Backfill ◽  
Preventive Action ◽  
Unclassified Tailings ◽  
Paste Backfill ◽  
Lead Zinc ◽  
Zinc Mine ◽  
Deep Cone Thickener ◽  
Thickened Tailings

Deep cone thickener (DCT) is key equipment in cemented paste backfill (CPB) technology. However, rake blockage occurs frequently in DCT during the dewatering process of the unclassified tailings being thickened from dilute slurry to thickened tailings or paste. Rake blockage has disastrous effects on the CPB operation. In order to investigate the influencing factors of rake blockage in DCT, a mathematical model of rake power in DCT was developed. In addition, stacking mud bed (made of thickened tailings) from the DCT in Huize lead-zinc mine (HLZM) in different rake blockage accidents was sampled and tested to investigate the effect of tailings characters on rake blockage. Results indicated that the concentration of the mud bed and the friction between the mud bed and the cone wall contributed to the rake blockage. The concentration and friction were influenced by the high content of coarse particles in the mud bed. Moreover, activating devices for bed mud, as the corrective and preventive action, were developed to prevent the rake blockage, which was valid in HLZM.

Utilization of Jinchuan Unclassified Tailings in Mine Filling

2014 ◽  
Vol 1073-1076 ◽  
pp. 2158-2162
Author(s):  
You Tuan Wang ◽  
Zhi Qiang Yang ◽  
Qian Gao ◽  
Mao Hui Li
Keyword(s):  
Compressive Strength ◽  
Fine Particle ◽  
Cementitious Materials ◽  
Hydration Products ◽  
Gel Structure ◽  
High Mechanical Strength ◽  
Fine Particle Size ◽  
Unclassified Tailings ◽  
The Cost

In order to utilize the unclassified tailings and reduce the cost of backfill in Jinchuan mine, compressive strength experiments were conducted by taking unclassified tailings as aggregating material. The influence of unclassified tailings on compressive strength was studied, and the influence of unclassified tailings on Hydration products and microstructures was analyzed by XRD and SEM also. The results show that the fine particle size and higher mud content of unclassified tailings have adverse effect on early strength, especially on 3d compressive strength, but it can mprove the long-term strength. The hydration products of the new backfill cementitious materials is mainly C-S-H gel, the flocculent C-S-H gel form dense gel-structure and bond the aggregates together form the high mechanical strength. With the new backfill cementitious materials can achieve 30% utilization of unclassified tailings in Mine Filling, and attained the goal of reducing backfill costs and protecting the environment.

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