Reduction of chromium(VI) to chromium(III) with sodium borohydride in an alkaline medium

Journal Article · Mon Aug 01 00:00:00 EDT 1988 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:6187012

Khain, V S; Martynova, V F; Volkov, A A

In many cases it is necessary to extract chromium from spent industrial solutions. The method in use is based on the reduction of the chromate to chromium(III) with metallic aluminum in a strongly alkaline medium. It was demonstrated earlier that in solutions with pH = 8-10 chromium(VI) is slowly reduced by sodium borohydride to chromium(III) hydroxide. Responsible for the reaction are not the BH/sub 4/ ions, but its hydrolysis products: mono-, di-, and trihydroxyborohydrides. With the aim of understanding more accurately the mechanism of the process and of finding the optimum conditions for the separation of chromium from the solutions, we studied the quantitative rules governing the reduction of the chromate ion in weakly alkaline solutions of NaBH/sub 4/.

• Research Organization: Ukhta Industrial Institute (USSR)
• OSTI ID: 6187012
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Vol. 24:3; Other Information: Translated from Izv. Akad. Nauk SSSR, Neorg. Mater.; 24: No. 3, 462-465(Mar 1988)
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BOROHYDRIDES
REDOX POTENTIAL
CHROMIUM COMPOUNDS
REDUCTION
INDUSTRIAL WASTES
MATERIALS RECOVERY
SODIUM COMPOUNDS
CHEMICAL REACTION KINETICS
CHROMATES
EXTRACTION
KINETIC EQUATIONS
OPTIMIZATION
PH VALUE
PRECIPITATION
REDUCING AGENTS
SPECTROPHOTOMETRY
VALENCE
ALKALI METAL COMPOUNDS
BORON COMPOUNDS
CHEMICAL REACTIONS
EQUATIONS
HYDROGEN COMPOUNDS
KINETICS
MANAGEMENT
OXYGEN COMPOUNDS
PROCESSING
REACTION KINETICS
RECOVERY
SEPARATION PROCESSES
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
400201 - Chemical & Physicochemical Properties