The Elements of economic geology

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Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Part II. Ore deposits

Collection:: Economics Books

ECONOMIC GEOLOGY cement, ciment fondu. This cement is very resistant to chemical attack, sets in as many hours as Portland Cement takes days, consists of calcium silicate mixed with calcium aluminate, and is made by the electric fusion of bauxite and limestone. Bauxite is usually mined by those who use it, so that there is no common market price; the value depends on the percentage of free alumina, with deductions for high percentages of silica, iron, and titanium oxide, The highest grade bauxite ranges from 60 to 65 per cent. of alumina, with I per cent. of iron oxide, and 2 to 5 per cent. of silica ; most of it is used for the manufacture of aluminium for which the usual minimum is 52 per cent. of alumina, not over 3 or 4 per cent. of silica, 2 or 4 per cent. of titanium oxide, or over 6-5 per cent. of iron oxide. The second largest quantity is used for alum, for which the essentials are little titanium and iron, and no chromite, The qualities preferred are as follows —— For Manufac- ture of Aluminium Alum . | Refractories Cement . . Al,O,. + 52 per cent. + 52 percent. } 40 per cent + 45 per cent SiO... — 4% per cent. -—~— 10 per cent. —~ 15 per cent. + 10-15 per cent. Feo,Qq, — 61 per cent. low low 10 per cent. TiO... — 2 per cent. or 4 per cent, in highest grades. low, no Cr,03.

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