Dr. Courtney Young to Give Webinar
Dr. Courtney Young of Montana Tech's Metallurgical & Materials Engineering will be giving a webinar on some MWTP work he did a few years ago with Larry Twidwell and Dick Berg and two students at the time: Eric Streich and Krag Filius. The title and abstract are shown below. In the presentation, he reviews four of their previous research efforts and then focuses on this fifth project involving mixing slag and acid-rock drainage, namely water from the Berkeley Pitlake. His presentation is the first of three scheduled to start at 11am on Wednesday, Sept 19, 2012 in NRB 226 and will conclude at 1pm. If you want, you can listen from your computer by registering here and calling in at the start.
ARD Remediation with Slag: An Application to Berkeley Pitlake Water
Treating waste water, particularly acid rock drainage from both active and inactive mines, is critical worldwide for many reasons but usually for environmental purposes. Being part of a superfund site, the Berkeley Pitlake (BPL) in Butte MT may be the most famous acid-rock drainage (ARD) clean-up project in the United States. Currently, its treatment consists of a two-stage lime precipitation for processing only Horseshoe Bend Water which is the only adit to the BPL. Research has shown that another waste product, namely slags from pyrometallurgical operations, can be substituted for lime either wholly or in part. Three locally available slags from closed smelting sites were investigated: Rhone Poulenc/Stauffer Chemical Company slag from a phosphorous plant in Ramsay, MT; ARCO/Anaconda Copper Company slag from copper operations in Anaconda, MT; and ASARCO slag from a lead blast furnace in East Helena, MT. Each slag differed in iron, silica and calcium content and therefore reacted differently to remediate BPL water. Results were analyzed and modeled using statistical analyses of experimentally designed-tests and are presented in regards to pH and metal concentration as a function of amount added and particle size. Results indicate that slags can be used to either supplement or replace lime, depending on the application. Conceivably, the process could also be done in-situ. Aside from remediating ARD, an added socio-benefit, often referred to as dual ecosystem enhancement, is the removal of slag piles.