Engineering & Mining Journal

JUN 2016

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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JUNE 2016 • E&MJ; 87 www.e-mj.com PROCESSING SOLUTIONS 4200 SM: WIRTGEN Surface Miners cut, crush and load material in a single operation. WIRTGEN is the only manufacturer to cover a perfor- mance spectrum of up to 3,000 tons per hour with direct loading by conveyor belt. This high output is based on high-performance cutting technology and a wealth of experience acquired in three decades of application technology. Take advantage of innovative solutions from the technology leader. www.wirtgen.com Wirtgen gmbH · Reinhard-Wirtgen-Str. 2 . D-53578 Windhagen . T: +49 26 45 / 131 0 Surface Mining = Simple Mining www.wirtgen.com/mining A Wirtgen grOUP COMPAny "This new patented process enhanc- es the effi ciency of the LoSO4 system by capturing approximately 95% of crystals from the sludge and recycles them to be reused in the system," ex- plained Chuck Blumenschein, a co-in- ventor of the LoSO4 technology. He added, "This process boosts crystal growth, which improves the removal of sulphate and other solids from the wastewater stream." The fi rst step in the LoSO4 process uses a Multifl o system equipped with a Turbomix reactor to reduce sulphate to less than 1,800 mg/l. The chemical precipitation/adsorption reactions in the Multifl o system are enhanced by sludge recirculation in the presence of a seed material. The seed material is added only during startup to aid the initial calcium sulphate crystal growth kinetics. The fi rst-stage effl uent is then treat- ed with calcium and an aluminum-based salt in a second Multifl o/Turbomix sys- tem. This second-stage process precipi- tates sulphate as a highly insoluble cal- cium sulphoaluminate mineral known as ettringite. This step reduces the dis- solved sulphate in the effl uent to less than 100 mg/l. The excess sludge from the second Multifl o/Turbomix system is pumped to a third smaller Multifl o/Turbomix, which serves as a chemical regeneration tank. This step recovers more than 95% of the aluminum-based salt from the pre- cipitated sludge for reuse in the treat- ment process. According to the company, the effec- tiveness of the process relies upon the complete mixing, solids settling, and sludge recirculation of the combined Turbomix and Multifl o technologies at each stage of the treatment train. For high fl ow rates with lower sulfate con- centrations, nano fi ltration can be im- plemented, with the sulphate reduction technology applied to the membrane reject. This option minimizes fl ow to the sulphate reduction process and reduces the cost of the process. Schematic diagram of Veolia's LoSO4 process for mine wastewater treatment.

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