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Lightweight High Refractoriness Magnesia Cupels For Thermal Analysis

Basic Information
Place of Origin: Hunan,China
Brand Name: ZEN
Model Number: ZEN-604
Minimum Order Quantity: 100PCS
Price: TO BE DISCUSS
Packaging Details: Kraft paper box,white box,egg tray
Delivery Time: 15-40 days
Payment Terms: L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability: 2000000 Piece/Pieces per Month
Detail Information
Material:: Magnesium Oxide Shape: Round, Tapered Or According To Your Requirements
Packing: Custom Packing Acceptable Port: Shenzhen,China
Color: Milky White Sample Days:: 5-10 Days
Weight:: 50-55 Grams Depth Of Cup:: 12mm
Insied Diameter:: 30mm Height Of Ridge:: 6mm
Height:: 26mm Bottom Diameter:: 30mm
Top Diameter:: 40mm Featrue:: High Thermal Shock Resistance
Used: Used For Gold Ore Smelting, Melting,Assaying, Thermal Analysis
High Light:

Lightweight Magnesia Cupels

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high refractoriness Magnesia Cupels


Product Description

                  High Temperature Magnesia Fire Assay Cupels

   The cupel is a shallow, porous dish made of bone-ash, Portland cement, magnesia or other refractory and non-corrosive material.

Features:

1. Made of Magnesite

2. Used for smelting and assaying

3. High thermal shock resistance

4. Magnesia: ≥95%

5. Silica, Silicon dioxide: 0-5%

6. Property: high refractoriness(1100 centigrade degrees),rapid absorption(70%),and recovery rate of 97%-98.5%,easy to use, without milling.

Lightweight High Refractoriness Magnesia Cupels For Thermal Analysis 0

     The cupel is a shallow, porous dish made of bone-ash, Portland cement, magnesia or other refractory and non-corrosive material.

Cupels should not crack when heated in the muffle and should be so strong that they will not break when handled with the tongs. Good cupels give, a slight metallic ring when struck together after air-drying. It is best to heat cupels slowly in the muffle as this lessens the chance of their cracking.

     A good cupel should be perfectly smooth on the inside, and of the right porosity. If it is too dense, the time of cupellation is prolonged and the temperature of cupellation has to be higher, thus increasing, the loss of silver. If the cupel is too porous it is said that there is danger of a greater loss, due to the ease with which small particles of alloy can pass into the cupel. The bowl of the cupel should be made to hold a weight of lead equal to the weight of the cupel.

The shape of the cupel seems to influence the loss of precious metals. A flat, shallow one exposes a greater surface to oxidation and allows of faster cupellation; it also gives a greater surface of contact between alloy and cupel, and as far as losses are due to direct absorption of alloy, it will of course increase these.

     The writer, using the same bone-ash and cupel machine, and changing only the shape of the cupel, has found shallow cupelsto give a much higher loss of silver. In doing this work it was found harder to obtain crystals of litharge with the shallow cupelwithout freezing, and it was very evident that a higher cupellation temperature was required for the shallow cupel. The reason for this is that in the case of the shallow cupel the molten alloy is more directly exposed to the current of air passing through the muffle, and consequently a higher muffle temperature has to be maintained to prevent freezing. T. K. Rose* also prefers deep cupels on account of smaller losses. French found shallow cupels less satisfactory on account of sprouting.

 

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