PRELIMINARY EXAMINATION FOR ACIDS
Note 1. Do not boil with Na2CO3 unless necessary. If only alkalies are present it is unnecessary. Note 2. If organic acids and Groups I. and II. or H2CrO4 are present add HCl, and pass H2S before boiling with Na2CO3 to make solution (4). The following should be tested for separately:— HNO3.—Black ring test, with […]
Oxygen Gas
Take a few crystals of potassium chlorate (KClO3), place them in a clean dry test-tube, and heat them gently over a small bunsen flame; the salt begins to split, then fuses. Insert into the test-tube a splint of wood, glowing at the point, but do not allow the wood to quite touch the fused salt. The splint, which […]
Glass Working
Before starting to work at Practical Chemistry it is necessary that the student should have some knowledge of how to cut, bend, draw down, and round off the ends of glass tubing, make closed and bulbed tubes, mend test- tubes, top and bottom, and fit up a decent wash-bottle. In this chapter is included also […]
Properties of Gold & Alloys
From very early times the ancients were attracted by the beautiful colour, the brilliant lustre, and the indestructibility of gold, and spared no pains in the endeavour to acquire it. In the code of Menes, who reigned in Egypt in 3600 B.C. or about 2000 years before Moses, the ratio of value between gold and […]
Extraction Of Silver
The extraction of silver by the solving processes simple. The ore is first roasted with salt in the usual way, whereby the formation of base metal chlorides cannot be avoided entirely. After roasting, the ore is first subjected to leaching with water, in order to extract the base metal chlorides, and then with hyposulphite of […]
Basic Ball Mill Grinding Circuit
A mill consists of a steel shell supported at each end by a hollow trunnion running in a bearing, lined with steel plates, and driven by belt and gears or by motor and gears. The mill is set at a slight slope and is fed with finely crushed ore and water through one trunnion. When […]
TECHNICAL WRITING for Metallurgists
General Principles Superlatives and the Superfluous The Subjunctive, Shall And Will, And The Possessive Punctuation Jargon Clearness Prepositions and Prepositional-Verbs
RP4 Shaker Table
RP-4 Shaker Table Instructions Manual RP-4 GOLD SHAKER TABLE All RP4 shaker tables operate best when firmly secured to a dense solid mounting base. Wooden stands will set up harmonics and vibrations. Dense concrete or solid bedrock is preferred or a heavy braced steel table sitting on concrete. Mount shaker table to solid bed rock […]
How to Extinguish a Mine Fire
In the anthracite fields of Pennsylvania, mine fires occur with more or less regularity and their existence is an ever-present hazard in coal mining. In all probability 90 per cent, of the mine fires can be ascribed directly or indirectly to the ordinary miner’s open lamp. Other causes may be smoking, electrical installations, gas explosions, […]
Analyse & Assay Refined Lead
In preparing a sample of refined lead for analysis, it is necessary to exercise great care to avoid contamination, as the amounts of the various impurities present in market lead are very small. The lead is cut into convenient-sized pieces, which are flattened out with a hammer, so that, on putting the lead through the […]