The Process and Application
of Oxygen-Enriched Air Side Blown
Smelting of Lead–Zinc Materials
Ling Zhang, L. Zhang and Y. He
Abstract The paper has discussed smelting process and application of oxygenrich side blown for lead–zinc materials. This process includes three steps: oxidation
melting, reduction melting, and slag fuming which are continuously conducted in
three oxygen-rich side blown furnaces connected by chute. The lead–zinc materials
fed into the first furnace for oxidation melting and desulfurization produce lead-rich
slag which flows into the second furnace to produce crude lead and reduction slag
which flows into the third furnace to fume and produce zinc oxide dust. The result
of application indicates that the process can treat materials with 22–40% lead and
about 10% zinc content in furnace charge. The specific capacity of the furnace is
about 60 t/m
2 d. Oxygen concentration in oxygen-enriched air side blown oxidation
furnace reached 90%. Desulfurization rate of oxidation furnace reached 99.5%. The
coal rate of reduction reached 8.6%. The furnace life is up to 5 years. Lead and zinc.
Recovery are over 97% and 92%, respectively.
Keywords Lead smelting · Oxygen-enriched air side blown · Oxidation
reduction · Fuming
Lead-bearing polymetallic materials exist mainly as metal oxides and sulfates. At
present, the blast furnace is widely applied in China for processing the lead-bearing
polymetallic materials after briquetting. This process is characterized by low investment for per unit output and high direct recovery, yet low SO 2 concentration in
off-gas, impossible for direct acid production, resulting in unsatisfactory environmental protection effect. The oxygen-enriched side blown process is based on the
enriched oxygen-enriched smelting; the off-gas contains high concentration of SO 2 ,
which can be directly used for acid making with good environmental protection
effect. This process can make full use of chemical reaction heat of the charge and
consume less fuel with wide adaptability of the raw materials, it can process powder
L. Zhang (B) · L. Zhang · Y. He
CINF Engineering Co., Ltd., Changsha 410011, Hunan, People’s Republic of China
e-mail: zlingcinf@126.com
© The Minerals, Metals & Materials Society 2020
A. Siegmund et al. (eds.), PbZn 2020: 9th International Symposium
on Lead and Zinc Processing, The Minerals, Metals & Materials Series,
https://doi.org/10.1007/978-3-030-37070-1_25
291
of Oxygen-Enriched Air Side Blown
Smelting of Lead–Zinc Materials
Ling Zhang, L. Zhang and Y. He
Abstract The paper has discussed smelting process and application of oxygenrich side blown for lead–zinc materials. This process includes three steps: oxidation
melting, reduction melting, and slag fuming which are continuously conducted in
three oxygen-rich side blown furnaces connected by chute. The lead–zinc materials
fed into the first furnace for oxidation melting and desulfurization produce lead-rich
slag which flows into the second furnace to produce crude lead and reduction slag
which flows into the third furnace to fume and produce zinc oxide dust. The result
of application indicates that the process can treat materials with 22–40% lead and
about 10% zinc content in furnace charge. The specific capacity of the furnace is
about 60 t/m
2 d. Oxygen concentration in oxygen-enriched air side blown oxidation
furnace reached 90%. Desulfurization rate of oxidation furnace reached 99.5%. The
coal rate of reduction reached 8.6%. The furnace life is up to 5 years. Lead and zinc.
Recovery are over 97% and 92%, respectively.
Keywords Lead smelting · Oxygen-enriched air side blown · Oxidation
reduction · Fuming
Lead-bearing polymetallic materials exist mainly as metal oxides and sulfates. At
present, the blast furnace is widely applied in China for processing the lead-bearing
polymetallic materials after briquetting. This process is characterized by low investment for per unit output and high direct recovery, yet low SO 2 concentration in
off-gas, impossible for direct acid production, resulting in unsatisfactory environmental protection effect. The oxygen-enriched side blown process is based on the
enriched oxygen-enriched smelting; the off-gas contains high concentration of SO 2 ,
which can be directly used for acid making with good environmental protection
effect. This process can make full use of chemical reaction heat of the charge and
consume less fuel with wide adaptability of the raw materials, it can process powder
L. Zhang (B) · L. Zhang · Y. He
CINF Engineering Co., Ltd., Changsha 410011, Hunan, People’s Republic of China
e-mail: zlingcinf@126.com
© The Minerals, Metals & Materials Society 2020
A. Siegmund et al. (eds.), PbZn 2020: 9th International Symposium
on Lead and Zinc Processing, The Minerals, Metals & Materials Series,
https://doi.org/10.1007/978-3-030-37070-1_25
291