Abstract
The sieve analysis and atomic Absorption methods were applied for 21collected samples around Atbara region - River Nile State- Sudan. Three types of grinder were used in this study they are (1) A grinder (2) B grinder and (3) mill size to given us the general trend of gold concentrate with preferable grain size in area of case study. The gold assay result for different grain size within same sample reflect direct relationship between gold concentrate and grain size which gold increasing with finer grain size. he grain size equal or less than 0.075mm is the preferable size to recovery most gold from original material, and there is a difference in types of mills and efficiency, For each mill grinding time for each sample varies from the mill to another and it is reliable Depending on the test rate of the sieves in the sieves and definitely affects the reading of the concentrations of samples and therefore control the rate of raw inside is known and the percentage of milling as well as all depends on the quality control of the mining plants and reduces errors. From this study we conclude the sieve analysis isgood method to evaluate quality of various grinders.
Highlights
The sieve analysis, commonly known as the gradation test, is a basic essential test for all aggregate technicians
The sieve analysis test presented a direct relationship between grain size and gold concentrate which slightly increase with finer grains, and proved there is differences between samples which analyzed directly with plant mill size and samples after grinded in the preparation side by using AandB finer grinder, for all the assay of the mill size is less than assay after grindingdue to degree of grinding which are high on grinder A and B than plant mill size
The strong relationship between grain size and gold concentration appear in the above figure 1 where fineaggregates showed high gold contents when compare with gold amount of coarse aggregates for same sample
Summary
The sieve analysis, commonly known as the gradation test, is a basic essential test for all aggregate technicians. The sieve analysis determines the gradation (the distribution of aggregate particles, by size within a given sample) in order to determine compliance with design, production control requirements, and verification specifications. Size is a fundamental property of sediment particles. As a result of complex physical, chemical and biological processes, a major fraction of trace metals is found to be associated with water body sediments. The essential factors influencing the heavy metal contents in sediments include the physical and chemical properties (grain size, surface to volume ratio, heavy metal contents of the main geochemistry phase), in which grain size is a main control parameters. Some studies have indicated that coarser particles show similar or even higher heavy metal concentrations than finer ones and the presence of coarser particles are possibly responsible for higher metal content in the coarser size fractions [5]
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