クロム含有スラグからのクロム回収方法 - Nippon Steel & Sumitomo Metal Corporation

Title:

クロム含有スラグからのクロム回収方法

Document Type and Number:

Japanese Patent JP6451462

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a method for recovering chromium from a chromium-containing slag, in which reduction treatment of chromium contained in a slag is efficiently performed till concentration of CrObecomes low using an electric furnace with weak agitation force, even when the slag contains chromium oxide at high concentration, thereby chromium can be inexpensively recovered.SOLUTION: The method for recovering chromium from a chromium-containing slag is provided in which: an auxiliary material with sieve mesh of +25 mm containing the slag is 5 to 30 mass% of an electric furnace charging material, an auxiliary material with sieve mesh of -3.15 mm is 3 mass% or more of the electric furnace charging material; molten iron temperature T after the reduction treatment is 1500°C or more; and a carbon source and a silicon source with C and Si concentration in the molten iron after the reduction treatment satisfying formula (1) and quick lime and/or lime stone and an alumina source with CaO, SiOand AlOconcentration in the slag satisfying formula (2) are each added to the electric furnace. C≥-29.4+0.015×(T+273)-0.003×(T+273)×log(Si) (1) 0.04≤(CaO)/{(SiO)×(AlO)}≤0.20 (2).SELECTED DRAWING: None

Inventors:

Katsuhiko Kato
Yasuhiro Tanaka

Application Number:

JP2015075083A

Publication Date:

January 16, 2019

Filing Date:

April 01, 2015

Export Citation:

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