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Updated: May 11, 2025
At the society had some essays upon the specific weight of the ore of manganese, which was caviare to the President, and I think most of the members. But it seemed extremely accurate, and I have little doubt was intelligible to those who had the requisite key. We supped at Mr. Russell's, where the conversation was as gay as usual. Lieut-Col. Ferguson was my guest at the dinner. December 4.
When the percolating acidulated water passes slowly through a pure limestone it is filtered of impurities and deposits a crystal, either pure white or transparent; if it comes in contact with metallic bodies of any kind, it carries away more or less in solution to act as coloring matter; the beautiful pale green onyx in several Missouri counties taking its tint from the copper; in South Dakota, manganese in various combinations produces black and many shades of brown; in both states an excessive flow of water often carries a quantity of red or yellow clay which temporarily destroys the beauty of exposed surfaces, but in after years becomes a fine band of brilliant color.
We effect the move between us. What I am after is oxygen, the gas which I once saw fail so lamentably. I thought it all out at my leisure, with the help of a book. I will do this, I will do that, I will go to work in this or the other fashion. Above all, we will run no risks, perhaps of blinding ourselves; for it is once more a question of heating manganese dioxide with sulfuric acid.
An excess of manganese renders cast iron hard and brittle, and imparts to it the properties to absorb gases, while an amount of 1.5 per centum, as found in Scotch iron, undoubtedly has the effect to produce those properties for which this iron is held in high repute. The amount of copper is not visibly altered by fusion, but that of phosphorus and sulphur slowly increased.
For manner of using, see farther on, under head of Accelerators. Bromides. A bromide treated with oil of vitriol, disengages chlorohyadic acid; but vapors of bromine are constantly disengaged, at the same time imparting a brown color to the gas. If the bromide be treated with a mixture of sulphuric acid, and peroxide of manganese, bromide is only disengaged.
Of ferromanganese and other very manganiferous substances, in which the manganese need not be determined with greater exactness than to 0.1 per cent., only 0.01 gram. is taken for a test; but of common pig, wrought iron, steel, iron ore, slags, etc., there is taken 0.5 to 1 gramme according to the supposed content of manganese and the desired exactness of the estimation.
From the corrected volume of the solution required, calculate the amount of oxalic acid undecomposed by the pyrolusite; subtract this from the total quantity of acid used, and calculate the weight of manganese dioxide which would react with the balance of the acid, and from this the percentage in the sample.
It was not, in fact, the presence of one-tenth of a percent of sulphur or phosphorous which affected the result if the Bessemer process were combined with his process by adding a triple compound of iron, carbon, and manganese to the pig. After emphasizing the uniqueness of his attempt to make Bessemer's process successful, he asserts:
"I like to reconstruct my cases in my own mind," explained Kennedy, as he took his time in the examination. "Now, this fellow must have stripped the safe of all the outer trimmings. His next move was to make a dent in the manganese surface across the joint where the door fits the body. That must have taken a good many minutes of husky work.
The latter method is hardly practicable, and I never have time to use it, as the titration and all together yields a value of 99.80 in most cases, if accurately executed. From the bases of groups V. and VI. these are separated by hydrogen sulphide, from iron in alloys, ores, etc., and in general the iron is separated as basic acetate, and the manganese afterward precipitated with chlorine.
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