CH83155A
(en )
1919-11-17
Process for smelting lead ores with basic gangue
FR518251A
(en )
1921-05-21
Ore concentration process
CH78964A
(en )
1918-09-16
Process for smelting smelting materials
AT87448B
(en )
1922-02-25
Process for producing cement from liquid slag in an electric furnace.
CH82595A
(en )
1919-10-01
Process for leaching substances
CA198928A
(en )
1920-04-06
Apparatus for smelting ores
FR524603A
(en )
1921-09-08
Process for the reduction of iron ores
CH81398A
(en )
1919-11-17
Process for the extraction of minerals
FR572375A
(en )
1924-06-04
New ore roasting process
FI8919A
(en )
1922-04-21
Procedure for refining ore after slag process
CH80535A
(en )
1919-03-17
Process for enriching the copper concentration in electrolytic baths
FR520529A
(en )
1921-06-27
Ore concentration process
FR571282A
(en )
1924-05-14
Process for extracting rocks and ores
CH78963A
(en )
1918-09-16
Process and device for the reduction of ores
AT87383B
(en )
1922-02-25
Device for processing ores using the foam floating method.
AU1117919B
(en )
1920-06-01
Improved method and apparatus for concentrating ores by flotation
CA194115A
(en )
1919-11-18
Smelting process
AU1165419A
(en )
1920-10-26
Method of roasting ores or concentrates
FR548449A
(en )
1923-01-15
Zinc ore processing process
AT111036B
(en )
1928-10-25
Process for the direct recovery of molten low carbon pure iron from ores.
AT88426B
(en )
1922-05-10
Process for processing manganese-containing slags and ores.
CA4662S
(en )
1919-10-20
Sign
CH83124A
(en )
1919-11-17
Process for the preparation of mercury oxide by electrolysis
FR519843A
(en )
1921-06-16
Improvements in lead refining
CA190149A
(en )
1919-05-06
Ore manufacturing apparatus