304
C. Chen et al.
New Technology for Particle Size Control of Oxygen Pressure Leaching
Products
Due to the improper control of reactor operating conditions during operation, the
elemental sulfur generated in the leaching process and the unreacted sulfide form an
enveloping polymer, which affects achieving high leaching rates of the reaction. The
application of two kinds of additive instead of one single not only effectively avoids
the leaching requirement of molten zinc sulfide and other sulfide sulfur package
agglomerate but also takes good control of the output material particle size and
eliminates employing a pressure tank. Overall, it lowers the overall additive cost
consumption and significantly improving the efficiency of leaching of ore concentrate
obtaining leaching rates of 98–98.5%.
Upgrading of Main Equipment
One of the refractory lining materials in the high-pressure autoclave was replaced
by a new patented product in China that meets the requirements of long service life
and greatly reduces the cost of the autoclave. Furthermore, adjusting the tank lining in the flash tank in conjunction with a structural form transformation effectively
enhanced the anti-abrasion and anti-corrosion performance of the equipment. Manufacturing and installation cost were significantly decreased with equipment operating
availability at above 90%.
Zinc Electrowinning Cellhouse
For the first time, the employment of glass fiber reinforced plastic wind fans installed
on the roof was adopted for cellhouse ventilation. The acid mist is removed by means
of cooling tower fan and ventilation and exhaust fan, which effectively lowered the
potential severe equipment corrosion rate caused by acid mist over long-term operation. In addition, a comparison with the conventional ventilation method showed
that ventilation air change and energy consumption could be reduced.
The oxygen pressure leaching system at Danxia smelter greatly improved the level
of available zinc smelting technologies and equipment in China. At the same time, the
stable operation of ten years played a positive role in promoting the transformation
and improvement of the existing zinc smelting technologies in China. At present,
in order to improve the overall smelting process for lead and zinc, it is planned
during the relocation of Shaoguan smelting plant, an affiliation of the company, to
design and put into production a set of flash smelting systems matching the output
of secondary slag in the existing lead–zinc process, so as to realize zero discharge
and zero storage of waste slag.
C. Chen et al.
New Technology for Particle Size Control of Oxygen Pressure Leaching
Products
Due to the improper control of reactor operating conditions during operation, the
elemental sulfur generated in the leaching process and the unreacted sulfide form an
enveloping polymer, which affects achieving high leaching rates of the reaction. The
application of two kinds of additive instead of one single not only effectively avoids
the leaching requirement of molten zinc sulfide and other sulfide sulfur package
agglomerate but also takes good control of the output material particle size and
eliminates employing a pressure tank. Overall, it lowers the overall additive cost
consumption and significantly improving the efficiency of leaching of ore concentrate
obtaining leaching rates of 98–98.5%.
Upgrading of Main Equipment
One of the refractory lining materials in the high-pressure autoclave was replaced
by a new patented product in China that meets the requirements of long service life
and greatly reduces the cost of the autoclave. Furthermore, adjusting the tank lining in the flash tank in conjunction with a structural form transformation effectively
enhanced the anti-abrasion and anti-corrosion performance of the equipment. Manufacturing and installation cost were significantly decreased with equipment operating
availability at above 90%.
Zinc Electrowinning Cellhouse
For the first time, the employment of glass fiber reinforced plastic wind fans installed
on the roof was adopted for cellhouse ventilation. The acid mist is removed by means
of cooling tower fan and ventilation and exhaust fan, which effectively lowered the
potential severe equipment corrosion rate caused by acid mist over long-term operation. In addition, a comparison with the conventional ventilation method showed
that ventilation air change and energy consumption could be reduced.
The oxygen pressure leaching system at Danxia smelter greatly improved the level
of available zinc smelting technologies and equipment in China. At the same time, the
stable operation of ten years played a positive role in promoting the transformation
and improvement of the existing zinc smelting technologies in China. At present,
in order to improve the overall smelting process for lead and zinc, it is planned
during the relocation of Shaoguan smelting plant, an affiliation of the company, to
design and put into production a set of flash smelting systems matching the output
of secondary slag in the existing lead–zinc process, so as to realize zero discharge
and zero storage of waste slag.