University of Khartoum

Alternative Method for Mercury Amalgamation in Gold Extraction (Artisanal and Small Scale Gold Mining)

Alternative Method for Mercury Amalgamation in Gold Extraction (Artisanal and Small Scale Gold Mining)

Show full item record

Title: Alternative Method for Mercury Amalgamation in Gold Extraction (Artisanal and Small Scale Gold Mining)
Author: Alsamani, Maha Karimeldin Zain Elabdeen
Abstract: The amalgamation has several drawbacks including impacts on environment, threats to workershealth and communities from released methylmercury into air and loss of fine gold with escaping mercury fines (flour). The aim of this research is to find an alternative mercury-free method for local artisanal and small scale miners by using borax as gold collector. The experiment was carried out by selecting 25kg of gold-bearing rocks. The material was crushed and milled to 0.25mm size to produce heavy concentrates by water-flushing using gravimetric concentrators. The concentrates were mixed with borax & Na NO3 as a flux at ratio of 1:2 to produce pure gold pellets at 1063℃. The improved gold recovery was due to the fact that no gold fines escaped as in the case of mercury flour. In the study area, analysis of several samples had also confirmed the escape of mercury fines (flour) with the flowing slurry. Ten samples of Karta were analyzed for gold and found to be ranging between 4.441g/t to 9.830g/t at average 6.974g/t. On comparison with gold amalgamation, borax-heat fusion experiment was successfully carried out and proved that borax could be of great use as a safe, simple method in the Sudan Case.
URI: http://khartoumspace.uofk.edu/123456789/26119


Files in this item

Files Size Format View

This item appears in the following Collection(s)

Show full item record

Share

Search DSpace


Browse

My Account