Claims
- 1. An exothermic slag-forming mixture for refining metals, said mixture comprising an aluminium powder, sodium or potassium nitrate, a silica-containing component, calcium oxide, a compoent selected from the group consisting of expanded pearlite and fluorspar, and a silicon-containing component, said silicon being in elemental form.
- 2. An exothermic mixture as claimed in claim 1, comprising (weight per cent):
- ______________________________________aluminium powder 0.1-15sodium nitrate 24-40calcium oxide 5-15silicon-containing component 0.1-20component selected from the group consisting of expanded pearlite and fluorspar 5-15silica-containing component the balance.______________________________________
- 3. An exothermic mixture as claimed in claim 1, comprising from 0.1 to 6.0% of powdered silicon taken as a silicon-containing component, the weight percentage of its other constituents being as follows:
- ______________________________________aluminium powder 9-15sodium nitrate 28-30calcium oxide 5-15component selected from the group consisting of expanded pearlite and fluorspar 5-15silica-containing component the balance.______________________________________
- 4. An exothermic mixture as claimed in claim 1, whose composition incorporates from 5 to 20.0% of calcium silicon in combination with 0.1-20% of manganese ore as a silicon-containing component, the weight percentage of the other mixture constituents being as follows:
- ______________________________________aluminium powder 0.1-10sodium nitrate 24-40calcium oxide 5-45component selected from the group consisting of expanded pearlite and fluorspar 5-15silica-containing component the balance.______________________________________
Parent Case Info
This is a continuation of U.S. Pat. Application Ser. No. 775,929, filed Mar. 9, 1976, now abandoned.
US Referenced Citations (4)
Continuations (1)
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Number |
Date |
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Parent |
775929 |
Mar 1976 |
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