29 Ovens, Furnaces & Heating Equipment car catalysts or powdered ore samples to almost 100% in jewellery alloys or bullion bars.


Determining the precious metal content (assaying) of gold, silver (via silver titration) and platinum/palladium (using Inductively Coupled Plasma Optical Emission Spectroscopy [ICP- OES]) is fundamental to those valuing, buying or selling second-hand precious metals.


While X-ray fl uorescence (XRF) spectrometry is far more accurate today than in the past providing reliable results, there remains several drawbacks including the initial purchasing expense. As a result, we still fi nd gold cupellation, which dates back over 2000 years, is a much-used process. It ensures all other elements are eradicated, leaving only pure gold. Small samples are accurately weighed and wrapped in lead with a pre-determined quantity of silver to assist with the collection of gold and the removal of base metals. The wrapped samples are placed on cupels (porous blocks) and heated to 1100oC in a furnace. The lead and any base metals as oxides are driven off. A pure gold and silver bead remains, which is then boiled in nitric acid, dissolving the silver and leaving a residue of fi ne gold. When the weight of the residue is compared with the original sample the gold content by weight can be calculated. The assay of gold alloys by cupellation is a standard method used by the UK Assay Offi ces and a reference method laid down by the International Hallmarking Convention in accordance with ISO 11426:1997 and ASTM E1335-08.


Whatever the means of recovery the fact remains that we will continue to see an increasing requirement for the recycling of precious metals as our culture becomes ever more dependent on high-tech electronics. In addition, by 2040 Bloomberg New Energy Finance predicts that more than half of all vehicles sold will be electric powered (and governments around the globe are rapidly trying to increase that proportion and bring forward that timeframe). To meet these requirements, we must now recycle rather than mine extremely limited and unsustainable supplies. The cost of recycling and the reduced


Pouring molten gold SCF1 - smelting furnace


environmental impact will inevitably foster the creation of new recycling providers as the world’s love for precious metals shows no sign of abating any time soon.


Article provided by Carbolite Gero who manufacture smelting & cupellation furnaces used by Assay offi ces and precious metal recycling organisations around the globe.


Read, Share and Comment on this Article, visit: www.labmate-online.com/article HPLC Oven Accurately Controls Columns from Room Temperature to 90°C


Torrey Pines Scientific, Inc announces its new EchoTherm™ HPLC Column Oven Model CO20. The temperature range is from room temperature to 90°C readable and settable to 0.1°C. The PID temperature control software regulates temperatures to ±0.1°C. Temperature accuracy and stability are ±0.1ºC with a stable temperature indicator lamp on the front panel that lights when the target temperature is stable to within ±0.2ºC.


The unit holds columns up to 30 cm long by ¼” or 3/8” diameter in mounting clips provided with room for guard columns and fittings.


Larger diameter columns may be used by removing the column clips that hold the smaller columns. The CO20 features simple controls, digital display of target and actual chamber temperatures, an injection counter, and 30-day timer with alarm and user settable Auto-Off. An accessory stand is available.


The unit operates from 12 volts DC and comes with a bench top universal power supply for use anywhere in the world, 3-wire AC


line cord for the country of use, counter cable, twelve month warranty and instruction manual. The Model CO20 is UL, CSA, and CE compliant.


50656pr@reply-direct.com


New Generation Soft Dry Bath


The high quality soft dry bath developed and produced by Wiggens performs with uniform heat transfer and fast heat conduction. It features a bright and clear LCD digital display and setting for the working temperature, stirring speed, working time and safety temperature. A direct connection for Pt100 temperature sensor provides a convenient temperature control solution. With infrared heating (IR) technology, built-in 3 set PID parameters, the bath can achieve faster heating effect and better temperature stability.


The Wiggens soft dry bath is very suitable for replacing the small oil bath commonly used in the laboratory dry bath module. It accommodates any container shape, operates without oil, therefore no cleaning is required as it operates from an electric heating sleeve and other heating methods. The stainless steel bottom helps to transfer the heat to alloy particles extremely quickly. The housing is surrounded by PTFE material, for insulation and anticorrosion.


The Wiggens new generation soft dry bath permits simple operation whilst still meeting the modernity of smartphones, allowing users feel connected to the intelligent lab.


More information online: ilmt.co/PL/nOV9 48085pr@reply-direct.com


Laboratory Scale Kit for Safe Heating of Round Bottom Flasks


The DrySyn Scholar Kit from Asynt has been designed to meet, without compromise, the safety requirements required in academic laboratories for the heating and stirring of round bottom flasks, whilst maintaining ease of set up and use.


The DrySyn Scholar combines robustness, affordability and enhanced operator safety features making it the ultimate ‘student friendly’ heating block system.


Specifically designed for safety conscious teaching laboratories - the DrySyn Scholar kit enables the heating of single 100 mL and 250 mL round bottom flasks, without the mess or inherent safety hazards of a hot oil bath or heating mantle. Prominent lifting handles ensure moving even hot reaction blocks is easy, fast and safe. Options are available to further expand the use of the DrySyn Scholar base for reactions in 25 mL and 50 mL flasks.


Compatible with almost any magnetic hotplate stirrer, thanks to a set of adjustable feet, the low thermal mass design of the DrySyn Scholar delivers fast heating and low power consumption while maintaining accurate and precise temperature control.


More information online: ilmt.co/PL/aAwr 51284pr@reply-direct.com


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40