含砷铁矿石烧结及除尘灰焙烧脱砷热力学

doi:10.13228/j.boyuan.issn0449-749x.20160389

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Abstract In order to study the arsenic removal by sintering of iron ore and roasting of dust ash，the effects of different oxygen?partial?pressures， temperatures and basicities on the equilibrium compositions，dearsenication rate about arsenic-bearing ores with sintering， and the final morphology of arsenic were investigated by FactSage thermodynamic analysis software， and thermodynamic study on the process of arsenic removal by roasting from dust ash was carried out. Sintering test was carried out in combination with sintering cup， and the roasting experiment about dust ash in multi atmosphere was carried out to verify the thermodynamic analysis. The XRD， SEM and EDS were used to analyze the ore phases. The research results show that arsenic removal product and dearsenication rate are closely related to the temperature， oxygen partial pressure and basicity. In the process of sintering， the residue of arsenic in the sinter mainly exists in the solid state arsenate， and the other arsenic is removed in gaseous As4O6（g）.The arsenic in the dust ash exists in solid state As2O3（s） and As2O5（s）. In the air or anaerobic atmosphere， arsenic transfers into arsenate as roasting of dust ash. However， roasting of dush ash with added coal above 600 ℃ could cause the arsenic to be volatilizedasg as eous As4（g）， and precipitated as arsenic below 400 ℃.

Key words： arsenic-bearing iron ores sintering oxygen partial pressure thermodynamics dust ash

Received: 30 August 2016 Published: 09 June 2017

PACS:

TF512，TF046

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	Articles by authors
	CHENG Ri-Jin
	NIE Hong-Wei
	ZHANG Hua
	XIONG Shan
	GU Shao-Kai

Cite this article:

CHENG Ri-Jin,NIE Hong-Wei,ZHANG Hua等. Thermodynamics of arsenic removal from arsenic-bearing iron ores with sintering process and dust ash by roasting[J]. Iron and Steel, 2017, 52(6): 26-33.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20160389 OR http://www.chinamet.cn/Jweb_gt/EN/Y2017/V52/I6/26

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