A Practical Guide for Prospectors, Explorers And Miners ...
A Practical Guide for Prospectors, Explorers And Miners ...
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To quickly assess the difficulty of the text, read a short excerpt:
The various processes should be conducted in the follow- ing order : — 1. Preparation of charge.
2. Scorification.
8. Cupellation.
4. Weighing bead (an alloy of gold and silver).
5. Inquartation (when necessary).
6. Parting.
7. Weighing residue of fine gold.
8. Calculations.
Weigh out — Powdered ore . • . .50 grains.
Granulated lead .... 500 „ Borax 5 ,, Digitized by VjOOQIC ASSAY APPARATUS AND ASSAYING 207 Mix the ore with half the granulated lead and cover the mixture with the remainder of th...e granulated lead and borax.
When the temperature of the muffle is right (pale red heat), place the scorifier, which has been previously heated, well into the muffle. After a lapse of three or four minutes, when the charge will be melted, partly open the muffle door to admit air, which acts as an oxidising agent. When the alloy is thoroughly melted it is well to add a few grains of powdered anthracite wrapped in tissue paper, as it has a cleansing action on the slag. When the molten lead is entirely covered with slag the heat is increased in order to thoroughly liquefy the slag ; then withdraw the scorifier, and pour the contents into an iron mould previously warmed.
What to read after A Practical Guide for Prospectors, Explorers And Miners ...?
You can find similar books in the "Read Also" column, or choose other free books by Moore, Cuninghame Wilson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The various processes should be conducted in the follow- ing order : — 1. Preparation of charge.
2. Scorification.
8. Cupellation.
4. Weighing bead (an alloy of gold and silver).
5. Inquartation (when necessary).
6. Parting.
7. Weighing residue of fine gold.
8. Calculations.
Weigh out — Powdered ore . • . .50 grains.
Granulated lead .... 500 „ Borax 5 ,, Digitized by VjOOQIC ASSAY APPARATUS AND ASSAYING 207 Mix the ore with half the granulated lead and cover the mixture with the remainder of th...e granulated lead and borax.
When the temperature of the muffle is right (pale red heat), place the scorifier, which has been previously heated, well into the muffle. After a lapse of three or four minutes, when the charge will be melted, partly open the muffle door to admit air, which acts as an oxidising agent. When the alloy is thoroughly melted it is well to add a few grains of powdered anthracite wrapped in tissue paper, as it has a cleansing action on the slag. When the molten lead is entirely covered with slag the heat is increased in order to thoroughly liquefy the slag ; then withdraw the scorifier, and pour the contents into an iron mould previously warmed.
What to read after A Practical Guide for Prospectors, Explorers And Miners ...?
You can find similar books in the "Read Also" column, or choose other free books by Moore, Cuninghame Wilson to read onlineMoreLess
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