Copper Mineral Selective Leaches
These methods may be run alone or in sequence to semi-quantitatively identify potential recovery by various ore processing methods. ALS can also provide custom methods based on metallurgical requirements.
Aqua regia is an effective solvent for copper oxides and sulfides, but copper occurring with other commodities like molybdenum can be analyzed by four acid digestion for consistency across data sets.
Ore Grade Rare Earth Elements
Many REEs occur in minerals resistant to acid digestion, so fusion is the preferred method of decomposition. ALS offers ICP-MS/ICP-AES and XRF determinations. These methods are most appropriate for known ores; see the Whole Rock Analysis & Lithogeochemistry section for trace level methods.
Trace Level Lithium Exploration
Lithium hosted in pegmatites and jadarite can occur with economic grades of rare earths and other trace metals such as boron and cesium. A sodium peroxide fusion is required for complete recovery in these deposits.
Lithium In Sedimentary Deposits
In many cases, aqua regia provides better recovery of Li than four acid digestions due to complex chemical reactions. Roasting samples prior to four acid digestions, particularly hectorite, may mitigate this effect.
XRF is the industry-standard analytical method for bauxite analysis. Results are reported on a dry weight (110°C) basis by default. Additional characterization methods such as organic carbon, reactive silica and available alumina comply fully with CETEM performance criteria. Multi-screen sizing to determine the optimum screen size for recovery and subsequent wet beneficiation are also available.
Oxidizing Fusion & XRF Finish
Samples are analyzed by XRF following a lithium borate fusion with the addition of strong oxidizing agents to decompose sulfide-rich ores. Other elements are available to report on request. LOI may be optionally added to this method, but it is not used to normalize results.
Base Metal Concentrates By XRF
Samples are analyzed by XRF following a lithium borate fusion with the addition of strong oxidizing agents to decompose sulfide concentrates. Other elements are available to report on request. LOI may be optionally added to this method, but it is not used to normalize results.