Net Acid Generation Test Essay

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What results would lead you to the conclusion that the material tested has high potential for AMD generation and would indicate that more extensive and intensive tests should be done to confirm the results.

When looking at the Paste pH and Electrical Conductivity Tests, we are looking for an acidic environment and an environment with a high concentration of salt. Specifically, if our site sample has a pH of less than 4, then that indicates that the sample is acidic. If our site sample has an electrical conductivity greater than 2000 μSiemens per centimeters, then that indicates that the sample has a high level of soluble ionic constituents. If the sample is shown to be acidic and has a high level of soluble ionic constituents, then that may
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This is a type of rapid leach testing that is similar to kinect tests, but they provide faster results. The net acid generation test is based on the principle that hydrogen peroxide accelerates the oxidation of iron sulfide minerals. The acid consequently produced dissolves neutralizing minerals presents, and the net result of the acid production and neutralization can be measured directly. This test is relatively fast (can provide an indication of sulfide reactivity and available neutralizing potential within 24 hours), does not require sulfur determinations, and requires the minimum of laboratory equipment (lower cost and less space). If the pH from this test is greater than 4, this classifies the sample as non-acid …show more content…
These tests are used to asses the relative potentials of samples to produce acid drainage, rather than to simulate field drainage quality and to determine rates of mineral oxidation and dissolution. There are quite a bit of kinetic tests available, but I would recommend using the humidity cell test because it is more commonly used in laboratories. The humidity cell tests simulate long-term weathering reactions and predict future potential for acid generation and metals migration from the site sample. It uses deionized water as the extractant, requires 1 kg of the sample, periodic/labor intensive application and collection of extract, requires laboratory space for long-term studies, and requires the use of custom-made cells. Unfortunately, this test is quite time consuming. But, this test will provide primary-mineral reaction rates and the ratio of rates of acid generation and neutralization potential

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