The flowsheet in this study was designed to treat 500 tons per day of a complex base metal ore containing gold and silver values. The presence of free gold offers opportunity to recover these values in the grinding circuit so that the gold could be amalgamated, and marketed directly to the mint. The ore as … Read more
In the majority of the zinc operations, sphalerite (ZnS) is associated with galena and often sulfides of iron and copper. It is therefore essential to arrange the flowsheet not only for recovery of the valuable minerals, but also to selectively separate them into products acceptable to the smelters for ultimate conversion into metal. The flowsheet outlined … Read more
The flowsheet above was designed to treat economically approximately 200 tons in 24 hours of a low-grade dump ore containing lead and zinc values as well as some silver in both sulphide and oxide form. Due to varying specific gravities of the values, gravity concentration in addition to flotation was indicated. As is common in many … Read more
The problem of treating oxidized lead-zinc ores for the production of high-grade lead zinc concentrates is a complex problem due to the nature of the ores and to the soft sliming characteristics of the lead and zinc minerals. The ore for treatment is a lead-zinc carbonate ore in a mixed siliceous-lime carbonate gangue. The association of … Read more
The problem of treating oxidized lead-zinc ores for the production of high-grade lead zinc flotation concentrates is a complex problem due to the nature of the ores and to the soft sliming characteristics of the lead and zinc minerals. The ore for treatment is a lead-zinc carbonate ore in a mixed siliceous-lime carbonate gangue. The association of … Read more
Sulphide ore of lead and zinc containing considerable silver was submitted for testing with the purpose of determining a flowsheet for the production of separate lead and zinc concentrates for marketing at their respective smelters. It is necessary to recover as much silver as possible in the lead concentrate as a higher return for this … Read more
The concentration of fluorspar ores by flotation is well established but the treatment of lead-barite-fluorspar ores has long been recognized as a difficult process generally resulting in unacceptable concentrates with relatively poor recoveries. Intensive research on this problem is continually being conducted to develop favorable reagent combinations and conditions suitable for treating such ores. The … Read more
To understand froth flotation, first read that article and come back to read about sequential flotation of Copper, Lead and Zinc. Given a baseline amount of frother and collector, these curves are the approximate/relative rate of flotation recovery of Copper (Chalcopyrite/Bornite/Chalcocite/Covellite/Tennantite/Enargite/Tetrahedrite /Freibergite ), Lead (Galena) and Zinc (Sphalerite) as well as iron (pyrite/arsenopyrite) minerals VS … Read more
To improve the selectivity between copper and lead, a sequential copper-lead-zinc rougher circuit was tested. Each of the rougher circuits had a dedicated regrind and cleaner circuit. The advantages of the sequential circuits are that the levels of selectivity can be increased, particularly for copper and lead. With this process, copper was recovered first with MBS depression of lead, … Read more