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Reaction Behavior of Na2SO4-Containing Copper Matte Powders in a Simulated Flash Converting Process.
- Source :
- Metallurgical & Materials Transactions. Part B; Oct2021, Vol. 52 Issue 5, p3468-3476, 9p
- Publication Year :
- 2021
-
Abstract
- Sodium sulfate accumulation in the water system is a common problem in the production of primary metals from sulfide minerals. In flash smelting-flash converting copper smelters, when molten copper matte quenched in industrial water to produce matte granules, Na<subscript>2</subscript>SO<subscript>4</subscript> precipitated and entered the system, which had negative influence on the matte converting process. The reaction behaviors of copper matte powder containing Na<subscript>2</subscript>SO<subscript>4</subscript> have been studied through thermodynamic calculation and single-particle experiments. Calculated results showed that a liquid sulfate phase, Na<subscript>2</subscript>S containing copper matte, and Cu–Na alloy may form in the processing conditions of the converting process. The influence of the Na<subscript>2</subscript>SO<subscript>4</subscript> dosage, fluxing conditions, and processing temperature has been systematically studied, and the results obtained showed that: (1); Na<subscript>2</subscript>SO<subscript>4</subscript> physically precipitated on matte particles, and the Cu–Na alloy phase was found within copper phase in reacted particles; (2); Na<subscript>2</subscript>SO<subscript>4</subscript> contamination hindered oxygen transfer by forming a low melting sulfate phase, and the de-sulfuration rate of matte powder changed dramatically along with the variation in Na<subscript>2</subscript>SO<subscript>4</subscript> amount; (3); CaO flux was able to promote the converting reactions and Na<subscript>2</subscript>SO<subscript>4</subscript> transformation; (4); Na<subscript>2</subscript>SO<subscript>4</subscript> melt and formed a sulphate layer on matte particles at 1000 °C, Cu–Na alloy phase was found in samples collected at 1200 °C, and Cu–Na–O phase was detected in blister copper at 1600 °C. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10735615
- Volume :
- 52
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Metallurgical & Materials Transactions. Part B
- Publication Type :
- Academic Journal
- Accession number :
- 152559166
- Full Text :
- https://doi.org/10.1007/s11663-021-02275-7