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Archives :: Chementator :: Hydrometallurgy, Minerals

Displaying 1 - 11 of 11 stories.
April 1, 2013
First application of sulfuric acid heap leach to vanadium
Following a positive feasibility study, American Vanadium Corp. (Vancouver, B.C.; www.americanvanadium.com) will construct the world’s first sulfuric acid heap-leach mining operation for vanadium at a specific geologic formation in central Nevada, known as Gibellini Hill. The project is currently in the permitting and mine-engineering stage, and...
http://www.che.com/chementator/hydrometallurgy_minerals/First-application-of-sulfuric-acid-heap-leach-to-vanadium_10365.html
March 1, 2013
A recipe for improved Ti extraction from ilmenite
Existing metallurgical processes for titanium production from ilmenite — by far the most sought-after titanium ore — are plagued by disadvantages, mainly the generation of large amounts of waste, and improvements are needed to treat ilmenite for the production of high-grade TiO2 pigment. Now, a group from CSIRO Minerals Down Under National Research Flagship and CSIRO Process Science and...
http://www.che.com/chementator/hydrometallurgy_minerals/A-recipe-for-improved-Ti-extraction-from-ilmenite_10251.html
January 1, 2013
Improved bioleaching for nickel recovery
An Indian team from the Institute of Minerals & Materials Technology (www.immt.res.in), and Utkal University (both Bhubaneswar, Orissa, India; www.utkal-university.org) has achieved significant improvement in the recovery of nickel from lateritic ore by using oxalic acid produced by the fungus Aspergillus niger supplemented with manganese. Prior to leaching, thermal pre-treatment (at 600°C for 5 h)...
http://www.che.com/chementator/hydrometallurgy_minerals/Improved-bioleaching-for-nickel-recovery_10079.html
December 1, 2012
A patented process produces battery-grade lithium
Lithium producer Galaxy Resources Ltd. (Perth, Western Australia; www.galaxylithium.com) says that lithium carbonate product from its wholly owned Jiangsu Lithium Carbonate Plant has achieved battery grade quality using the company’s patented process (flowsheet). The Jiangsu plant is located in the Yangtze River International Chemical Industrial Park of the Zhangjiagang Free Trade Zone in...
http://www.che.com/chementator/hydrometallurgy_minerals/A-patented-process-produces-battery-grade-lithium_9979.html
November 1, 2012
Microbial processing of ore
Extraction of metals, such as lithium, from laterite ores is usually carried out through solubilization of metals by acids, such as sulfuric and hydrochloric acids. However, substantial metal recoveries from laterites have been achieved only through thermal pre-treatment of laterites, using high concentrations of acids at high temperatures.  Microbial processing of laterite ores at ambient conditions...
http://www.che.com/chementator/hydrometallurgy_minerals/Microbial-processing-of-ore_9896.html
June 1, 2012
Winning copper from low-grade ore
India holds large reserves of low-grade sulfide copper ore containing 0.3 wt.% copper, which cannot be processed through conventional routes since the cut-off grade for treatment in concentrators is about 0.45 wt.%. India is in short supply of copper and an appropriate technology for processing low-grade ores would contribute to India’s economy. Accordingly, a team from the Institute of Minerals...
http://www.che.com/chementator/hydrometallurgy_minerals/Winning-copper-from-low-grade-ore_9357.html
March 1, 2012
A new roasting process slated for commercialization
Outotec Oyj (Espoo, Finland; www.outotec.com) has introduced a new partial roasting process to purify copper and gold concentrates that are contaminated with arsenic, antimony and carbon. The process is a pretreatment stage for Cu- and Au-extraction plants, and enables the extraction of metals from ores that had previously been unattractive because the impurities create a “huge problem” of...
http://www.che.com/chementator/hydrometallurgy_minerals/A-new-roasting-process-slated-for-commercialization_9027.html
March 1, 2012
Very rapid cooling enables a new way to produce magnesium
A carbothermal process for obtaining magnesium — developed by CSIRO (www.csiro.au) Light Metals Flagship (South Clayton, Victoria, Australia) — overcomes previous limitations to commercial viability. For several years, magnesium has been produced mainly by electrolytic routes, from magnesium chloride sources such as seawater and natural brines. More recently, world production has been mainly in...
http://www.che.com/chementator/hydrometallurgy_minerals/Very-rapid-cooling-enables-a-new-way-to-produce-magnesium_9035.html
February 1, 2012
Heavy-metal removal process joins advantages of two existing technologies
A newly demonstrated system for removing trace levels of heavy metals from water combines the positive traits of two existing technologies — chemical precipitation and electrowinning — while avoiding drawbacks of each. An engineering team at Brown University (Providence, R.I.; www.brown.edu), led by Joseph Calo, described the cyclic-electrowinning-precipitation (CEP) process in a recent issue...
http://www.che.com/chementator/hydrometallurgy_minerals/Heavy-metal-removal-process-joins-advantages-of-two-existing-technologies_8940.html
November 1, 2011
World’s highest-purity lithium plant announces commercial launch
A facility that produces high-purity lithium carbonate for use in the growing market for electrolytes in electric-vehicle batteries has begun commercial operations in Imperial Valley, Calif. The 500-ton/yr plant, operated by Simbol Materials (Pleasanton, Calif.; www.simbolmaterials.com), is the only producer of high-purity Li2CO3 in the U.S., and one of three worldwide. “We can produce the...
http://www.che.com/chementator/hydrometallurgy_minerals/Worlds-highest-purity-lithium-plant-announces-commercial-launch_8602.html
October 1, 2011
U.S. production is scheduled for a critical metal
China produces about 98% of the world’s electrolytic manganese metal (EMM), a vital ingredient used in specialty steels, aluminum and electronics. In contrast, the U.S. produces no EMM, says Nick Weir, an executive with U.S. American Manganese Inc. (AMY; White Rock, B.C., Canada; www.american manganeseinc.com). AMY plans to change that by using a patented hydrometallurgical process to extract the...
http://www.che.com/chementator/hydrometallurgy_minerals/U-S-production-is-scheduled-for-a-critical-metal_8502.html

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