The Chemical Analysis of Steel Works Materials

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) Pass hydrogen sulphide through the diluted solution, collect any precipitated copper sulphide and reserve it. Boil off the excess of hydrogen sulphide from the nitrate, add sodium phos- phate and then dilute ammonium hydrate until a precipitate just forms. Clear the solution with hydrochloric acid, dilute largely, add 10 grams of sodium thiosulphate, 20 c. C. Of acetic acid, and then boil, filter, and wash as in the estimation of aluminium in steel. Dissolve the ignited VANADIUM ALLOYS 211 ph...osphate of aluminium, which contains iron and vanadium, in hydro- chloric acid, and re-precipitate it, thus removing iron. To eliminate vanadium, dissolve the residue once more in acid, and to the solution, which is coloured if much vanadium is present, add one gram of sodium phosphate and sodium peroxide until the reddish brown colour of pervanadic acid is fully developed. Make alkaline with ammonium hydrate, boil, allow to settle, filter and wash the precipitate of aluminium phosphate. Set the filter and precipitate to digest in dilute hydrochloric acid, and in the meantime acidify the filtrate strongly and boil to decom- pose the pervanadic acid and excess of hydrogen peroxide.

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