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STATE OF <br /> COLORADO <br /> Reagent testing at Climax Mill <br /> Lazuk, Raymond <Raymond_Lazuk@fmi.com> Thu, Sep 18, 2014 at 8:16 AM <br /> To: "Scott, Eric" <Eric.Scott@state.co.us> <br /> Eric, <br /> As per our recent discussion on reagent testing at Climax, I am providing you with the following information for <br /> several upcoming pilot-scale test that we will be conducting within the coming weeks/months. The MSDSs are <br /> attached and the plans for testing are as follows: <br /> Froth Modifier Nalco 7561 <br /> • The product is NALCO 7561 that has foam control capability which we would like to use in <br /> our Cleaner Circuit. Specially, at the second concentrate launder, where the froth factor is high and <br /> we have had overflow issues. Currently, we are using PPG 4000 (described in my September 5 <br /> email) to address this matter. The Nalco product is potentially lower in cost and there is a local <br /> supplier that could reduce the lead time to deliver the product to the site. <br /> • This will be a pilot scale test and we will add this product at our Cleaner Circuit, more <br /> specifically, the 2nd Cleaner Concentrate Launder. <br /> • Our plan is to add 40 cc/min to the circuit during the test that will run for 7 to 10-days, <br /> provided that we do not see any negative impact on product quality or foam control. If we do, then <br /> we will stop the test, resume usage of PPG 4000, and return the Nalco product to the vendor. <br /> • We plan on bringing in two 55-gallon drums of the Nalco product to test. The drums will be <br /> located beneath the mill cleaner circuit, within secondary containment. <br /> Depressant Citric Acid <br /> • We will add citric acid with the First Cleaner Feed. This is to depress CaF2 at the first stage <br /> and have it rejected through the Cleaner Scavenger. Currently, we do not have any depressant for <br /> CaF2, one of our major contaminants. <br /> • This'll be a pilot scale test and the approximate dosage will be 60-100 cc/min. <br /> • We plan to bring in one tote (275-gallon)for this test, to be located under the cleaner circuit. <br /> • At a 100 cc/min dosage rate, we anticipate the testing to last approximately 7 days. <br /> Froth Modifier Polyglycol P 2000 <br /> • The product is very similar to PPG 4000 (see my September 5 email). Both are <br /> polypropylene glycol, the only structural difference is the molecular weight, as the number signifies. <br /> Due to the difference in molecular weight there are some minor differences in physical properties. <br /> The purpose of the test is to compare P 2000 with P 4000 in terms of pumping, foam control and <br />