Gold Redox ORP Probes used in Flotation Circuit

Three gold sensing electrodes were made from 3 mm gold rod. The rod was cut with a diamond wafering saw into 3 mm lengths, soldered to insulated copper wire, placed inside 9 cm lengths of 1 cm (outside diameter) Plexiglas tubing, and cast inside the tubing with epoxy. After the epoxy was set, the gold was polished with 600 grit emery paper. The exposed surface area of gold in the finished electrodes was 0.0707 cm².

A gel-filled, epoxy-body Ag/AgCl electrode was used as a reference electrode. The accuracy of this electrode was checked in Zobell standard redox solution using a freshly polished gold electrode. Unless otherwise indicated, all potentials are reported with respect to the Ag/AgCl reference potential.orp probes

ORP Probe Cleaning Procedures

Stability of the readings provided by the gold electrodes was measured in a molybdenite flotation slurry. Molybdenite flotation concentrate was slurried in deionized water at 10% by weight MoS2 pulp density in a Wemco two-liter glass flotation cell. The slurry was agitated by the flotation machine for approximately 8 h each day for the duration of the test. The slurry was open to the air during testing, but air was

Metal Melting Furnace

A metal recycler’ and small prospector’s favorite, the QM Deluxe offers a universal insert top so that users can use 4 different size crucibles interchangeably with the same unit. Therefore providing greater flexibility and use of the kiln for different jobs.

usa manufacturer

The QuikMelt Deluxe top loading kiln is the perfect solution for the metal treating artist looking for mobility. Works effectively with gold, silver, lead, copper, zinc, and more. The QuikMelt Deluxe comes with a universal crucible, digital control panel, 1500 watts of power, and rapidly heats to over 2200 F for all your metal working needs.

The QuikMelt Deluxe is a high quality top-loading kiln for treatment/melting of precious metals including: Gold, Silver, Sterling Silver, Copper, Bronze, Zinc, Lead, and Tin. The QM is great a gold concentrate refining.

-Outside Dimensions: 6″ x 6″ x 12″ (W x D x H)buy
-Product Weight: 10 Lbs
-Crucible Chamber: 100 oz
Comes standard with a 30 Troy Oz crucible
  Optional 60 Oz (+10% cost) and 100 Oz (+20% cost) upon request.
-Max Heating Temp: 2200 F (1205 C)
-Power: 1500 W with standard 15 Amp circuit
-Coiled Type Resistance Wire
-Controller Type: Digital


Metal Melting Furnace: Programmable RfPro-LP

An electronics recycler’s favorite, the RapidHeat technology is composed of a precise length of resistance wire to pump out 1500 watts of maximum heating power.

usa manufacturer

From there the resistance wire is custom coiled, re-stretched and embedded into our incredibly low thermal conductive ceramic insulation.

buyThis embedded element coil completely surrounds the firing chamber in two rows, maximizing the internal surface area being heated, therefore drastically reducing our firing times compared to those of our competitors.

Basic Specifications:

The RapidFire kilns are designed to rapidly heat to 2200 F (1205 C) for jewelry, metal clays (PMC), glass fusing, glaze testing and ceramics.

Art Clays, PMC, Glass Clays, Glaze Testing, Enameling, Ceramics, Metal Melting, Glass Fusing.

  • 30 programmable steps for ramp, soak and other logic actions
  • PID control with fuzzy logic enhancement
  • Dual alarm outputs made standard at no extra charge
  • 0.2% accuracy over the entire input range
  • Displays in either Fahrenheit or Celsius temperature unit
  • Percent output indication
  • Selectable security access levels
  • High brightness, large LED display easily read from distance
  • Manual, technical support and 90-days warranty
  • Outside Dimensions: 8″ x 7″ x 13″ (W x D x H)

Small Metal Melting Kiln

The QuikMelt Pro top loading kiln is the perfect solution for the metal treating artist looking for mobility. usa manufacturer

Works effectively with gold, silver, lead, copper, zinc, and more. With it’s ultra-light 10 lb compact design (6″ x 6″ x 12″), the QuikMelt 10 offers the best of functionality and portability. The QuikMelt comes with a 10 to 120 Troy oz crucible, digital control panel, 1500 watts of power, and rapidly heats to over 2200 F for all your metal working Select your graphite crucible: 10, 30, 60, 100 and 120 Troy oz sizes are available.

**Due to the nature of raw steel under extreme temperatures, the steel surface will experience tempering and coloration changes.


A metal recycler’s favorite, the QuikMelt Pro series kilns are designed with a lightweight, but extremely durable Gemcolite Alumina Fiber insert formed using a composition of alumina-silicate, alumina and mullite fibers and include both inorganic and organic binders for excellent handling strength and material integrity at high temperatures.

The QM is great a gold concentrate refining.

-Outside Dimensions: 6″ x 6″ x 12″ (W x D x H)
-Product Weight: 10 Lbs
-Crucible Chamber: 10 to 120

Automatic Pipette

For rapidly delivering known volumes of solutions the automatic pipette, shown in Fig. 29, will be found very useful. The bottle acting as a reservoir should be placed upon a shelf and the solution run down into the pipette. Since these pipettes are light compared with burettes, they can be joined directly on to the siphon tube leading from the reservoir by fusion and used for solutions, such as ammonium molybdate in nitric acid, which attack rubber rapidly. The siphon tube should be made of heavy walled glass tubing so as to resist breakage. The pipette may be fastened to a stand and the stand may be mounted on rollers, or not. Or the pipette may be mounted on the frame of the burette table. Before fastening the pipette to the stand or frame, the bottle should be placed on the shelf and moved about until the pipette is against its support. The pipette may then be fastened to the support by wire or a narrow thin brass band or spring.

Caustic soda and other solutions which absorb carbon dioxide should be protected from the air, or the air entering the bottle should be freed from the carbon dioxide by passing

Gold / Platinum Eh Electrodes

For the Eh measurements, the response of the electrodes in sulfide solutions was recorded in terms of response time and steady-state potential value. An Orion specific ion analyzer, Model EA 940 was used to monitor the electrode response. Potentials were measured with respect to a saturated calomel reference electrode, connected through a salt bridge. Since the potential of the calomel electrode may be affected by sulfide ions its performance was checked periodically (after a few experiments), against another reference electrode that had not been exposed to sulfide ions. The potentials are reported on the standard hydrogen scale (SHE). The potential of the saturated calomel electrode was taken as 0.245 V relative to the SHE.

Initially, the electrodes were cleaned by mechanical polishing. After initial preparation of the electrode, the electrode surface was cleaned between successive measurements by first flushing it with distilled water followed by an electrochemical treatment; unless specified otherwise. A typical electrochemical treatment consisted of cycling the potential of the electrode between two potential values, which are referred to as E1 and E2 in this study. The potentials E1 and E2 are, respectively, the lower and the upper potential limits of the electrochemical treatment. In this investigation, E1 was

Cryogenic Plant at Mining Metallurgical Processing Plants

In the 1940’s a top blown water-cooled oxygen lance was developed to inject oxygen into liquid iron. This process, the LD or BOF process technique, today is used in 65% of the world’s steel production, and represents the largest oxygen market for temperature enhancement in steel and non-ferrous smelting applications.

There are three major approaches to the use of oxygen in metallurgical processes: (1) general enrichment of the air supplied to burners or tuyeres, (2) under-flame enrichment or injection, and (3) the use of an auxiliary oxy-fuel burner as a heat source, with each of these techniques there are technical and economic trade-offs.

The simplest use is general enrichment of an air stream through a tuyere or air-fuel burner. It requires only simple flow control and distribution equipment. However, there are limits to the temperatures that may be achieved and capabilities of the refractory in a furnace which may be overheated. Throughput or productivity is often limited by temperature which affects reaction kinetics. Costs are low but productivity is, again, limited.

Effective placement of under-flame enrichment or injection equipment, while only slightly more equipment intensive, can get oxygen closer to the charge material or bath to be melted, permitting higher overall injection rate

Zirconium Crucibles

Zirconium crucibles are rapidly becoming a standard piece of equipment, particularly in laboratories where fusions using strongly alkaline fluxes are common. This Center has found no better material to use for the thousands of sodium peroxide fusions that are done here every year.

Zirconium crucibles usually arrive from their suppliers in a polished, silvery state. They resemble a polished iron or nickel crucible very closely. If they become confused with iron or nickel crucibles, they can be identified by tapping them with a pencil or spatula and listening to the tone produced. Zirconium crucibles produce a pleasant, almost musical tone when tapped. The first use of the crucible in a flame will produce a dark-gray coating over the metal that seems to enhance the crucible’s resistance to sodium peroxide. It is thought that this coating is a nitride or a nitride-oxide mixture, but no attempt has been made to confirm or refute the idea.

The use of zirconium crucibles should be limited to alkaline fluxes and fusions done over a burner. Zirconium crucibles should not be used for extended fusions or ignitions in a muffle furnace unless an atmosphere free of nitrogen and oxygen can be maintained in the furnace. The hottest

Bruker Handheld XRF

This is a general safety information regarding Bruker’s handheld X-ray fluorescence XRF analyzers. Proper training is vital for compliance, safe operation and understanding of the operator’s responsibilities associated with handheld XRF analyzer use. The term radiation is used to describe forms of energy emitted as particles or electromagnetic waves. There are two types of radiation: non-ionizing and ionizing. Non-ionizing radiation is radiation without enough energy to remove tightly bonded electrons from their orbits around an atom. Examples include visible light, radio waves, microwaves, infrared radiation and ultraviolet light. Ionizing radiation is radiation that has enough energy to remove electrons from an atom in a process called ionization. There are four types of ionizing radiation: alpha particles, beta particles, gamma and X-rays, and neutron particles. The process of ionization is important because it affects chemical and biological functions of the cells of the body and can be used to detect radiation.

bruker handheld xrf

X-rays are the type of radiation emitted from an XRF analyzer. They are a type of electromagnetic radiation that consists of photons or individual packets of energy. They have a neutral charge and no mass. X-rays originate from

Skyray Handheld XRF Spectrometer

Today we’re going to be introducing the new EDX Pocket 3 from Skyray Instruments. This is a brand new, handheld X-ray fluorescence spectrometer. It’s equipped with the latest XRF technology. To operate the instrument, we use this PDA right here; it’s wirelessly connected through Bluetooth to the instrument and you can also set it up to be connected to your computer or printer for real-time results. This instrument is very lightweight design and its ergonomic design gives you a comfortable yet effective way of testing samples whether it being in the mining field or whether it being a small piece of jewelry or clothes.

Today we’re going to run a short test on the instrument just to show you how it works. We’re going to run this cellphone here. Before you run the test, you want to select what kind of mode you’re going to be running. So, if you’re going to be doing different test method for alloys, select the alloy mode or today we’re going to be using the RoHS – restriction of hazardous chemicals directive test. Once you start the test button through the trigger, the red light turns on meaning the X-ray is on. And within a

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