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67mm High Hardness 9A Fire Assay Cupels For Thermal Analysis

Basic Information
Place of Origin: Hunan,China
Brand Name: ZEN
Model Number: ZEN-609
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: Medium Form With Lid
Dimensions:: Customized Packing: Custom Packing Acceptable
Port: Shenzhen,China Color: Milky White
Sample Days:: 3-7 Days Purpose :: Smelting, Melting,Assaying, Thermal Analysis
Application:: Fire Assaying, Gold Assaying, Precious Metal Analysis, Mineral Assaying, Laboratory Testing. Top Diameter: 67mm
Bottom Diameter: 50mm High: 67mm
High Light:

9A fire assay cupels

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High Hardness fire assay cupels


Product Description

                  High Hardness 9A Magnesia Cupels

   Fire assay it is a classical analytical method for applying metallurgical principles and techniques to analytical chemistry. To test the content of precious metals in minerals and metal products determined by melting and roasting.

 

67mm High Hardness 9A Fire Assay Cupels For Thermal Analysis 067mm High Hardness 9A Fire Assay Cupels For Thermal Analysis 167mm High Hardness 9A Fire Assay Cupels For Thermal Analysis 267mm High Hardness 9A Fire Assay Cupels For Thermal Analysis 3

Top Diameter:51mm or 56mm

Bottom Diameter:39mm or 46mm

Height:34mm or 38mm

Height of Ridge:13mm or 15mm

Insied Diameter:40mm or 46mm

Depth of cup:13mm or 15mm

Weight:80-86 grams

 

     Cupels. — A cupel is a porous cylinder or inverted-cone frustum of refractory material with a cupped depression in the upper end for retaining the lead button. In modern practice, cupels are made of bone ash, cement, bone-ash-cement mixtures, or magnesia. Magnesia cupels are purchased as a finished product, but the others are usually made at the assay office.

     Bone-ash cupels absorb a weight of litharge about equal to their own, cement cupels absorb slightly less than their weight, and magnesia cupels absorb three-fourths of their weight. Magnesia cupels are denser than bone-ash or cement cupels, hence a magnesia cupel of a given volume absorbs as much litharge as a bone-ash cupel of the same volume.

    Magnesia cupels have a higher heat capacity and thermal conductivity than bone-ash or cement cupels, and hence the heat of oxidation of the dwelling lead is abstracted more rapidly. The alloy is therefore maintained at a lower temperature than with bone-ash or cement cupels, but higher muffle temperatures must be maintained throughout the cupellation cycle. Largely on account of lower alloy temperature near the finish of cupellation the loss of silver by cupel absorption is greatly decreased and is usually less than half of the loss obtained with bone-ash cupels, under analogous cupellation conditions. The gold loss with magnesia cupels is the same as

 

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