Thermodynamic Justification of the Dephosphorization of Manganese Ores and Concentrates in a Reducing Atmosphere

Петелин, А. Л.; Polulyakh, L. A.; Makeev, D. B.; Dashevskii, V. Ya.

doi:10.1134/s003602951801010x

Cited by 4 publications

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“…[11][12][13] In order to solve the problem of "phosphorus damage" in iron and steel production process, domestic and foreign researchers have carried out experimental study on iron ore dephosphorization by using a variety of methods. Traditional dephosphorization methods such as beneficiation, 14,15) chemical treating, 16,17) gas-based reduction, 18,19) direct reduction 20) and microbial leaching, 21) due to their high energy consumption, high pollution, high equipment requirements, high cost and poor dephosphorizing effect, these methods could not meet the demand of industrial production. 22,23) Although the partial removal of phosphorus can be achieved by iron ore powder sintering and agglomeration process, however, in order to ensure the strength and reducibility of sinter in the common sintering process, the carbon content of raw materials must be controlled at about 5%.…”

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confidence: 99%

Gasification Behavior of Phosphorus during Pre-reduction Sintering of Medium-high Phosphorus Iron Ore

Chen

Zuo

2021

ISIJ Int.

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The effects of dephosphorization agents (SiO 2 , Na 2 CO 3 and Al 2 O 3 ) and reduction time on phosphorus gasification during pre-reduction sintering gasification dephosphorization were studied. The results indicate that the dephosphorization rate of apatite by carbothermal reduction is 23%, the dephosphorization rate of adding SiO 2 and Al 2 O 3 is 25%, and the optimal dephosphorization rate is 36% by adding SiO 2 and Na 2 CO 3 . The dephosphorization rate increased from 13% to 31% with the reduction time increased from 20 min to 60 min. Thermodynamic analysis shows that the promotion effect of Na 2 CO 3 on apatite reduction is stronger than that of Al 2 O 3 , and the thermodynamic conditions of apatite reduction are optimized to the greatest extent by adding SiO 2 and Na 2 CO 3 , with the starting temperature of carbothermal reduction of apatite decreased from 1 464°C to 746°C. P and C have the same variation and change trend, and the migration of phosphorus ito metallic iron is related to the carburizing reaction. The good heat storage of the sinter layer in pre-reduction sintering increases the time for maintaining the apatite reaction temperature and promotes the occurrence of dephosphorization reaction, however part of the phosphorus gas is absorbed by liquid metallic iron to form stable iron phosphorus compounds,which leads to the decrease of dephosphorization rate. Besides addition of dephosphorization agent, restricting migration of phosphorus into iron phase is the key point to increase gasification dephosphorization efficiency in sintering process.

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