20 Water/Wastewater


New On-line Cyanide Analyser to Help Gold Milling Operations Achieve Significant Cost Savings


Xylem’s OI Analytical (USA) brand is pleased to announce the launch of a new on-line cyanide analyser for gold milling applications. The new CNSolution 9310, when incorporated into the gold milling process, can facilitate significant cost savings for mill operators.


Most gold occurs at very low concentrations in ores; less than 10grams/ton (0.001%). Hydrometallurgical extraction using cyanide is the only economically viable method of recovering gold from such low-grade ore. Leaching solutions typically contain cyanide in concentrations from 50 to 2,000ppm, and purchasing, transporting, handling and detoxifying cyanide is a major operating expense for gold mills.


Accurately measuring cyanide available for leaching gold from ores containing copper and metallic sulphides is problematic, since copper complexes with cyanide and reduces the amount of cyanide available for leaching. To complicate the process further, titration methods commonly used for process control do a poor job of measuring available cyanide when copper is present. An excessive amount of cyanide must be added to the leaching solution to compensate for this measurement inaccuracy and to ensure a sufficient concentration is present for efficient extraction of gold.


Adding excessive cyanide in the leaching process decreases the efficiency and increases operating costs associated with the detoxification stage. Gold mills performing cyanidation need to adhere to the International Cyanide Management Code which defines good practices and guidelines for use, treatment and disposal of cyanide. The code sets a limit of 50mg/L in tailings solution discharges, and to comply with this limit the spent cyanide solutions must be detoxified. Detoxification requires the use of strong oxidising agents to destroy cyanide and reduce its concentration, adding yet another layer of expense to the milling of gold.


OI Analytical’s CNSolution 9310 On-line Cyanide Analyser measures available cyanide in precious metal leaching solutions per U.S. EPA Method OIA-1677 and ASTM D 6888-09. The gas-diffusion amperometry technique in these methods is proven to be free of interferences from copper and metallic sulphides, providing more


accurate measurement of the available cyanide concentration. The CNSolution 9310 responds quantitatively to cyanide, as well as zinc, copper, cadmium and silver cyanide complexes over the entire instrument calibration/measurement range (0.2 to 2,000ppm).


The superior accuracy of the CNSolution 9310 facilitates tighter control of the cyanide concentration in the leaching process and oxidising agent usage in the cyanide detoxification process, thus significantly reducing the amount of cyanide needed. A ten percent decrease in cyanide usage can easily translate into a savings of hundreds of thousands of dollars per year in the leaching and detoxification costs for a milling operation.


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Hydrotest Data Loggers Delivered to South East Asia


Aquatec Group (UK) have recently integrated their HYDROlog 2000 Hydrotest Data Logger instruments with a hot stab connection to provide a simple ROV-deployable and retrievable solution for a major pipeline pre-commissioning company in South East Asia.


The HYDROlog range was developed to provide a pressure and temperature record of pipeline


hydrostatic test procedures that take place during the pipeline pre-commissioning phase. A steady pressure record that remains above the required minimum test pressure allows the contractor to sign off on the installation. The temperature record is used to account for pressure variations due to changing ambient temperature.


By coupling the instrument to a hot-stab, it can easily be removed by an ROV immediately after the minimum pressure hold time has been met, and taken to the surface for data download and analysis, thus saving valuable ship time.


The integral hot stab is one of several methods for deploying the HYDROlog instruments. Other solutions include the use of subsea ROV-readable displays, real-time optical data links, and acoustic data links. Models are currently available to monitor test pressures up to 1400 bar.


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Datalogger Now Available for Stationary Deployments


Turner Designs (USA) recently configured an enclosure for stationary field deployments housing their popular DataBank Datalogger.


The new DataBank Datalogger Station offers great resistance to the environment allowing users to log data continuously during long term deployments. It approximates IP 66 and Nema 4x providing a degree of protection against corrosion, windblown dust and rain, and water splash-down.


The DataBank Datalogger Station stores up to 9,999 records as well as 16 calibrations


and uses an intuitive GUI interface for easy sensor configuration, calibration, and data download via USB connection to a PC. The DataBank’s internal memory enables unattended datalogging at user-defined intervals with the fastest datalogging interval at 1 datapoint/second. Power is supplied to the DataBank & Cyclops either from the internal battery or from an external source such as a marine battery for extended deployments.


The Databank Datalogger Station comes with one factory-installed, underwater rated impulse cable to be used as a power and communication cable with Turner Designs’ Cyclops sensors. Standard cable lengths offered by Turner Designs are 5M, 10M, 25M or 50M. Standard Cyclops optical kits are available for detecting: in vivo Chlorophyll, Crude Oil, Refined Fuels, CDOM/FDOM (dissolved organic material), Blue/Green Algae, Fluorescein Dye, Rhodamine Dye, PTSA Dye, Optical Brighteners, Tryptophan, and Turbidity. Cyclops Fluorometers can also be configured with custom optics for specialised applications per customer request.


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Flexible Multilevel Monitoring System Obtain superior quality subsurface data using a


Solinst (Canada) Multilevel System. CMT Systems monitor multiple depth-discrete zones within a single borehole. CMT (Continuous Multichannel Tubing) is polyethylene tubing with three or seven separate channels running its length. Monitoring zones are manually constructed, one in each channel, at different vertical intervals.


CMT Multilevel Systems are inexpensive and easy to install. In-field design flexibility allows the number of monitoring ports, port locations, and


monitoring strategy to be finalised right on site. Monitor up to 7 zones in the 1.7" (43 mm) System and 3 in the narrow 1.1" (28 mm) System. Depth-discrete groundwater data provides assessors with a better understanding of the three-dimensional flow and distribution of contaminants in the subsurface.


email: 187ad@reply-direct.com AET August / September 2013 www.envirotech-online.com For More Info, email: 22578pr@reply-direct.com


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