New Ideas for the Design of Green Smelting Project of Domestic …
303
Production Process Control
Zhuzhou smelter consolidated a number of production process control operation
methods to ensure the economic operation of the system. One example is the no
insulation operation for the reaction tower when the flash melting furnace stops for
a short time. During the shutdown of the flash melting furnace, the insulation for
the reaction tower is turned off resulting in lower consumption of energy. Another
example is the accelerated start and restart of the electric furnace production, taking
only 72 h for the electric furnace to reach normal operating mode.
During the years of stable operation, the Zhuzhou smelter has continuously
increased the percentage of secondary materials charged to the smelting process
in form of solid wastes and hazardous wastes, including purchased materials such as
lead floating dressing, lead raw ore, lead–zinc mixed ore, high gold ore, lead mud,
lead sand as well as in-house recirculated materials such as high acid slag, sulfur
slag, lead slag, silver flotation slag, and various types of dusts. The treatment of
these materials is truly green and environment-friendly with zero emission of waste
residue and increased the economic benefits of the enterprise, and also bringing good
social benefits.
Industrial Application of Oxygen Pressure Leaching
Combined with Pyrometallurgical Smelting Process
and Equipment
The Danxia oxygen pressure leaching plant is located in Dong Tang town, Renhua
County, Guangdong province. In order to take full advantage of the high contents
of rare metals in Fankou zinc concentrate, the project comprehensively recycles
gallium, germanium, silver, and other valuable elements. In September 2009, the
plant operating with these types of materials was commissioned.
Compared with other oxygen pressure leaching projects, this project has several
remarkable features.
Systematic Acid Equilibrium
In the oxygen leaching process of zinc concentrate, different raw materials have
different requirements on acidity, which may lead to problems with the acid balance
in the system. The process at Danxia is designed and constructed based on treating
seven water zinc sulfate. Fundamentally, this solved a series of problems caused
by the concentration of sulfate ions in the leaching process and ensured the good
operation of the entire system producing high value-added by-products and enlarging
the product portfolio of the company.
303
Production Process Control
Zhuzhou smelter consolidated a number of production process control operation
methods to ensure the economic operation of the system. One example is the no
insulation operation for the reaction tower when the flash melting furnace stops for
a short time. During the shutdown of the flash melting furnace, the insulation for
the reaction tower is turned off resulting in lower consumption of energy. Another
example is the accelerated start and restart of the electric furnace production, taking
only 72 h for the electric furnace to reach normal operating mode.
During the years of stable operation, the Zhuzhou smelter has continuously
increased the percentage of secondary materials charged to the smelting process
in form of solid wastes and hazardous wastes, including purchased materials such as
lead floating dressing, lead raw ore, lead–zinc mixed ore, high gold ore, lead mud,
lead sand as well as in-house recirculated materials such as high acid slag, sulfur
slag, lead slag, silver flotation slag, and various types of dusts. The treatment of
these materials is truly green and environment-friendly with zero emission of waste
residue and increased the economic benefits of the enterprise, and also bringing good
social benefits.
Industrial Application of Oxygen Pressure Leaching
Combined with Pyrometallurgical Smelting Process
and Equipment
The Danxia oxygen pressure leaching plant is located in Dong Tang town, Renhua
County, Guangdong province. In order to take full advantage of the high contents
of rare metals in Fankou zinc concentrate, the project comprehensively recycles
gallium, germanium, silver, and other valuable elements. In September 2009, the
plant operating with these types of materials was commissioned.
Compared with other oxygen pressure leaching projects, this project has several
remarkable features.
Systematic Acid Equilibrium
In the oxygen leaching process of zinc concentrate, different raw materials have
different requirements on acidity, which may lead to problems with the acid balance
in the system. The process at Danxia is designed and constructed based on treating
seven water zinc sulfate. Fundamentally, this solved a series of problems caused
by the concentration of sulfate ions in the leaching process and ensured the good
operation of the entire system producing high value-added by-products and enlarging
the product portfolio of the company.