scholarly journals A case study of grinding coarse 5 mm particles into sand grade particles less than 2.36 mm

2020 ◽  
Vol 43 (1) ◽  
pp. 56-69
Author(s):  
Aaron Reed ◽  
Larissa Koroznikova ◽  
Manoj Khandelwal
Keyword(s):  
Ball Mill ◽  
Particle Size Analysis ◽  
Process Efficiency ◽  
Size Analysis ◽  
Feed Material ◽  
Industrial Setting ◽  
Work Index ◽  
Work Input ◽  
Index Value

This paper presents the viability study of utilising a rod or ball mill to grind a ‘5 mm grit’ to 100% passing 2.36 mm and fit in with a desired particle size analysis.  The aim is to introduce this grit into the concrete grade sand produced at the Hanson owned Axedale Sand & Gravel quarry to reduce generated waste and improve the process efficiency. A ball mill and rod mill were used to grind the samples at an interval of 5 and 10 minutes. From the laboratory experimental analysis, it was found that a ball mill with 5 minutes grinding time in closed-circuit using a classifier to remove undersize and reintroduce oversize to the mill would be a viable option in an industrial setting. A Bond Ball Mill Grindability Test was undertaken to determine the grindability of the 5 mm grit, which served to determine the power (kWh/t) required to grind it to 100% passing 2.36 mm. The bond ball mill grindability test showed that the grit had a work index value of 17.66 kWh/t. This work index gives an actual work input of 13.54 kWh/t, meaning that for every ton of feed material introduced to the mill, 13.54 kWh of work input is required to grind it to 150 microns.

scholarly journals Siltation of Ore Particles in Leaching Tanks: Causative Factors and Mitigation Measures

2016 ◽  
Vol 16 (2) ◽  
pp. 51-57
Author(s):  
R. Osei ◽  
G. B. Abaka-Wood ◽  
G. Ofori-Sarpong ◽  
R. K. Amankwah
Keyword(s):  
Ball Mill ◽  
Settling Velocity ◽  
Efficiency Analysis ◽  
Particle Size Analysis ◽  
Mitigation Measures ◽  
Size Analysis ◽  
Mining Companies ◽  
Causative Factors ◽  
Closed Systems ◽  
Considerable Period

Siltation involves the accumulation of sediment over a considerable period of time and this may occur in closed systems like leaching tanks. Most mining companies in Ghana experience siltation problems during leaching of gold ore. This paper examines the potential causes and possible mitigation measures of siltation. Particle size analysis, slurry settling rate tests and agitation efficiency analysis were used in identifying causative factors of siltation whiles deflocculation test and grind analysis were conducted to ascertain mitigation measures.  Results from the study indicated that, high settling velocity of particles, inefficient milling and classification, poor slurry agitation and particle flocculation were the major causative factors leading to siltation. Size analysis results revealed P67 of 106 µm instead of P80 of 106 µm, a situation which affects particle suspension by agitators leading to siltation. This study therefore suggests that increase in milling residence time and particle deflocculation are potential remediation measures for curbing siltation. Extended grinding of ball mill feed resulted in 94% passing 106 µm while settling velocity was reduced by 71% after deflocculant addition at 1000 ppm. Keywords: Siltation, Deflloculation, Settling Velocity, Grinding

PREPARATION AND CHARACTERIZATION OF ANCHOVY (STOLEPHORUS SP) PROTEIN CONCENTRATE NANOPARTICLE USING IONIC GELATION METHOD

2020 ◽  
pp. 109-111
Author(s):  
ZULFIAYU SAPIUN ◽  
ARLAN K. IMRAN ◽  
PRISCA SAFRIANI WICITA ◽  
VYANI KAMBA ◽  
NANGSIH SULASTRI SLAMET
Keyword(s):  
Encapsulation Efficiency ◽  
Volume Ratio ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Analysis Tool ◽  
Protein Concentrate ◽  
Ionic Gelation ◽  
Volume Comparison ◽  
Index Value ◽  
Optimum Formula

Objective: Nanoparticle preparation can increase the bioavailability of anchovy protein. This study aims to optimize and characterize anchovy protein concentrate nanoparticle based on volume comparison of chitosan-TPP (Tripolyphosphate) matrix in forming the size of anchovy protein concentrate nanoparticle with ionic gelation method. Methods: Fresh anchovy was extracted by an acid-base method using solvents of NaOH and HCl to get protein concentrate. After that, it was conducted by formulating anchovy protein concentrate into a mixture of chitosan-TPP matrix with volume ratio which was divided into 5 series of variations, namely F1 without matrix, F2 1:1, F3 1:3, F4 1:5 and F5 1:7 ratio of chitosan to TPP, then formed matrix was determined the value of the encapsulation efficiency and characterized using a particle size analysis tool. Results: The results showed that the optimum volume comparison of the chitosan-TPP matrix in forming nanoparticle of anchovy protein concentrate was ratio 1:7 because this has a matrix encapsulation efficiency value of 99.11%, a small particle concentrate size of 687.26 nm, a good polydispersity index value of 0.406 and a value of zeta potential of+12.9 mV. Conclusion: The optimum formula of the chitosan-TPP matrix volume ratio in forming anchovy protein concentrate nanoparticle is F5 with the ratio of chitosan-TPP matrix mixture 1:7.

The Particle Size Analysis of Crushed Products

1950 ◽  
Vol 162 (1) ◽  
pp. 378-391 ◽  
Author(s):  
A. Ratcliffe
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Ball Mill ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Hammer Mill ◽  
Particle Fraction ◽  
Small Particles ◽  
Mathematical Basis ◽  
Characteristic Features

An examination is made of two particle size analyses which are typical of two categories of crushed products. One example represents material reduced in a hammer mill; subjected to indiscriminate reduction, it contains a preponderance of smaller sizes, and this is characteristic also of ball mill products and the small particles in the products of jaw, gyratory, and roll crushers. The second example illustrates the influence of the sizing action which occurs in the latter machines and results in a closer grading of the coarse particle fraction. These characteristic features are illustrated by graphs, and a mathematical basis is given for Gaudin's law of particle size distribution.

scholarly journals Determination of Work Index of Enyigba Lead Ore, Ebonyi State, South-East Nigeria

2015 ◽  
Vol 2 (1) ◽  
pp. 103 ◽  
Author(s):  
Obassi Ettu ◽  
Gundu D. T. ◽  
Ashwe Abugh ◽  
Akindele. M.
Keyword(s):  
Reference Material ◽  
Ball Mill ◽  
Research Work ◽  
Test Sample ◽  
Test Material ◽  
Size Analysis ◽  
Work Index ◽  
Two Samples ◽  
Steel Balls

The determination of work index of Enyigba Lead Ore, Ebony State using the modified bond energy (Berry & Bruce) method was investigated. The test sample was obtained from Enyigba village in Ebonyi State. A reference material (granite) was sourced from Anguwan-Boro granite deposit, Sabo, Kaduna metropolis. A known weight of reference and test material were crushed, pulverized and ground using the laboratory ball mill machine. The cell used in grinding the two samples has twelve steel balls of diameter 3.5cm and 222g weight. The size analysis of the feed for both reference and test material was found to be 218.2 and 218.6µm, and a ball mill discharge was 189.9 and 188.9µm respectively. The granite as a reference material with work index of 15.13kwh/ short ton was used to calculate the work index of the test material which was found to be 14.37kwh/short ton, being the energy required to comminute one tone of the ore and confirmed to be within the range indicated by previous research work on lead ore.

scholarly journals The Inadvertent Activation of Silicate Minerals Flotation and Their Depression in Molybdenite Beneficiation

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1296
Author(s):  
Yu Miao ◽  
Tao Long ◽  
Jingjun Wang ◽  
Fu Lai ◽  
Weiran Zuo ◽  
...  
Keyword(s):  
Water Glass ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Diagnostic Analysis ◽  
Silicate Minerals ◽  
Analysis Techniques ◽  
Molybdenum Concentrate

The Wushan Operation has been studied as a case study, particularly relevant to the copper-molybdenum separation circuit, in which efforts have been made to improve the quality of the molybdenum concentrate through diagnostic analysis. A key finding has been the appearance of coarser silicate minerals in the molybdenum concentrate due to their inadvertent activation in flotation. The suitable silicate minerals flotation conditions occurs, most likely, due to upstream bulk flotation regarding the usage of novel collectors and metal cations bearing process water. The flotation of silicate minerals can be diminished by the implementation of water glass and regrinding. The mechanisms underlying flotation behaviors have been revealed by using advanced in-situ surface analysis and particle size analysis techniques.

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