FIELD: technology of carbon-graphite materials. SUBSTANCE: dispersed graphite- containing wastes with iron content of 10-60 mas. are treated with concentrated sulfuric acid with oxidizer (K2Cr2O7), washed, dried and subjected to heat treatment for expansion in medium of reducing gas (CH4,, CO2 or H2) at 500-1100 C. EFFECT: reduced corrosivity of reaction products (gas atmosphere and expanded graphite) and improved magnetic properties. 3 cl, 2 tbl
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Authors
Dates
1995-07-25—Published
1988-08-01—Filed