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Updated: May 4, 2025
Burning and slaking afforded to man a natural means of putting it into form for distribution, and it is only within recent years that the pulverization of limestone for land has become a business of considerable magnitude.
Fine pulverization of the sample is not essential, and in fact is rather detrimental, as the graphite, when fine, is more difficult to wash without loss. When operating on a coarse sample more time is necessarily taken, but the resulting graphite shows the manner of occurrence better, whether in scales or in the amorphous form.
Pulverization of the rock by machinery for use on land is recent. The devices for burning are various, a modern lime plant containing immense kilns, cylindrical in form, the stone being fed into them at the top continuously, and the lime removed at the bottom. A large part of the lime that is sold for use on land is made in plants of this kind.
Still another class, though not exactly understanding his reasoning, had so great love for the young preacher and so great confidence in his ability that they were his warm advocates. Of this blindly trustful number, none were stouter in their adherence than Mason Rogers. To Hiram Gilcrest these sermons seemed the undermining, blowing up and pulverization of the whole structure of sound doctrine.
They should be dried under cover and hermetically closed up in sacks or other vessels to prevent untimely pulverization. The finer the flower-heads are pulverized the more effectually the powder acts and the more economical in its use. Proper pulverization in large quantities is best done by those who make a business of it and have special mill facilities.
Every instant the wall of fire is drawing closer in, the roll of the thunder is continuous, a dismal pulverization of 90,000 men! Never before has anything equal to this been seen; never before has an army been overwhelmed beneath such a downpour of lead and iron! At one o'clock all is lost. The regiments fly helter-skelter into Sedan.
Silver ore after pulverization is smelted by mixing with it fifty per cent. of lead in metal or ore, and ten per cent. of iron, and exposing the whole to a heat sufficient to melt the silver which runs off. The metal thus obtained is not pure but contains much lead, which is driven off by heat while the silver is kept in a molten condition for a period of four or six hours.
After pulverization comes the separation of the gold from the rocky portion of the powder. The means of separation are mechanical or chemical. The chemical process is amalgamation; the mechanical are those wherein the gold is caught on a rough surface with the aid of its specific gravity.
Hundreds of other acres will be ploughed by steam, improved by manures, or enriched by artificial soil obtained by the pulverization of rocks.
Pulverization of the soil can only be accomplished successfully after it has parted with the excessive moisture consequent on melting snows and spring rains. Therefore let it lie as thrown up by the spade until it is in a condition to crumble readily under the application of hoe or rake. Shrubs can be reset as soon as frost is out of the ground. Remove all defective roots when this is done.
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