scholarly journals Effects of the mineralogical composition and particle size distribution on the rheology of gold and copper tailings

2019 ◽  
Author(s):  
Pedro Desriviers Lehyt ◽  
Andres Quintero ◽  
Pierre Primeau
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Mineralogical Composition ◽  
Copper Tailings

Using Lime Mud Waste from Pulp Mill as an Additive in Brick Clay

2014 ◽  
Vol 608 ◽  
pp. 3-7
Author(s):  
Srichalai Khunton ◽  
Siriphan Nilpairach ◽  
Supin Sangsuk
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Pulp Mill ◽  
Mineralogical Composition ◽  
X Ray Diffraction ◽  
Brick Clay ◽  
X Ray ◽  
Lime Mud ◽  
Firing Shrinkage

Lime mud from a pulp mill was used as an additive in brick clay from the southern part of Thailand. It was mixed with the clay from Cha-Aud district, Nakorn Sithammarat province. The chemical composition of lime mud and the clay was characterised by X-ray fluorescence (XRF), and the mineralogical composition was measured by X-ray diffraction (XRD). The particle size distribution was also measured. The main composition of lime mud is CaO, and Cha-Aud clay consists of SiO2 and Al2O3 as major oxides. The lime mud contains calcite as a major phase when Cha-Aud clay is constituted by quartz, kaolinite, illite and goethite. Particle size distribution of lime mud is in the range of 1-50 μm. After the lime mud was neutralized using hydrochloric acid, it was mixed with Cha-Aud clay at 10 wt%. Samples with and without lime mud were sintered at 700, 800, 900 and 1000°C for 1 hour. The results showed that lime mud can be used as an additive in brick clay. Both types of samples were similar in terms of physical properties when their linear firing shrinkage, water absorption and flexural strength were in the same range.

scholarly journals PCE and BNS admixture adsorption in sands with different composition and particle size distribution

2017 ◽  
Vol 67 (326) ◽  
pp. 121 ◽  
Author(s):  
M. M. Alonso ◽  
R. Martínez-Gaitero ◽  
S. Gismera-Diez ◽  
F. Puertas
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Water Demand ◽  
Mineralogical Composition ◽  
Practical Experience ◽  
Clay Material ◽  
Great Complexity

The choice of a superplasticiser (SP) for concrete is of great complexity, as it is well known that properties of the end product are related to admixture and its compatibility with concrete components. Very few studies have been conducted on the compatibility between SPs and the sand of mortars and concretes, however. Practical experience has shown that sand fineness and mineralogical composition affect water demand and admixture consumption. Clay-containing sand has been found also to adsorb SPs, reducing the amount available in solution for adsorption by the cement. This study analysed the isotherms for PCE and BNS superplasticiser adsorption on four sands with different fineness and compositions commonly used to prepare mortars and concretes. BNS-based SP did not adsorb on sands, while PCE-based admixtures exhibited variable adsorption depending on different factors. The adsorption curves obtained revealed that the higher the sand fineness, the finer the particle size distribution and the higher the clay material, the greater was PCE admixture adsorption/ consumption.

scholarly journals Image Analysis Technology in the Detection of Particle Size Distribution and the Activity Effect of Low-Silicon Copper Tailings

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yuxiang Zhao ◽  
Xinzhong Liu ◽  
Biwen Liu ◽  
Qian Zhang ◽  
Dongdong Huan ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Image Data ◽  
Mechanical Force ◽  
Current Status ◽  
Model Parameters ◽  
Data Set ◽  
Copper Tailings ◽  
Sem Image

To speed up the comprehensive utilization and treatment of copper tailings, the digital image processing technology is proposed in this study to detect the low-silicon copper tailings (LSCT) using a scanning electron microscope (SEM), and the particle size distribution (PSD) and the activity of LSCT are analysed under the action of mechanical force. Firstly, the current status and application of copper tailings are introduced, and the influence of the particle size of LSCT on its practical application performance is explained. Secondly, the LSCT SEM image target recognition model is designed based on the convolutional neural network (CNN), and the model parameters and the reference CNN are selected. Finally, the experimental process is designed, a SEM image data set of LSCT is prepared, the model is trained through the training set, and the image recognition test is performed on the produced data set. The experimental results show that when the number of iterations of the CNN is 10, the accuracy of model recognition can be guaranteed. After the action of mechanical force, the PSD of LSCT is mainly concentrated at 1 μm~100 μm; that around 1.4 μm~10 μm is the largest, and the PSD of LSCT around 1.4 μm increases with the increase of action time of mechanical force, but the PSD of the LSCT begins to increase when the grinding time exceeds 150 minutes, and the activity of LSCT reaches the maximum (75.545%) at 150 minutes. The average accuracy of SEM image detection of the model is 86.97%, and the model based on DenseNet shows better recognition accuracy than other models. This study provides a reference for analysing the PSD of LSCT.

Mineralogical composition and particle size distribution as a key to understand the technological properties of Ukrainian ball clays

2015 ◽  
Vol 108 ◽  
pp. 102-110 ◽  
Author(s):  
Chiara Zanelli ◽  
Claudio Iglesias ◽  
Eduardo Domínguez ◽  
Davide Gardini ◽  
Mariarosa Raimondo ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Mineralogical Composition ◽  
Technological Properties ◽  
Ball Clays

Characterization of Clay Used in Structural Ceramic

2015 ◽  
Vol 820 ◽  
pp. 24-29
Author(s):  
Alessandra Savazzini dos Reis ◽  
Jailson N. Oliveira ◽  
Viviana P. della Sagrillo ◽  
Francisco R. Valenzuela-Diaz
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Mineralogical Composition ◽  
High Water ◽  
High Water Content ◽  
High Plasticity ◽  
Structural Ceramic

Structural ceramic quality is particularly related to the quality of the clays. Our aim is to characterize the common clay called Batinga used in the ceramic industry in Colatina - ES, which has a ceramic pole with about twenty companies. Batinga samples were tested for chemical and mineralogical composition, particle size distribution characterization, thermal behavior, optical microscopy, SEM and Atterberg limits. The specimens were shaped, dried at 110oC, burned in industrial furnace and submitted to ceramic test. The results show that the clay presents typical chemical composition of raw clay with significant amount of silica and alumina, besides adequate particle size distribution and mineralogical composition. The high plasticity shown may require high water content in the molding of ceramic roof tiles. The tests yielded results that showed that the clay meets the requirements of the Brazilian standard for structural ceramic.

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