Ausmelt / Isasmelt Matte Smelting: Part Two

요약:

One of the additional uses of Ausmelt technology is to allow for the recovering of copper from non-sulfide materials, particularly slags and sludges.

Most of the energy for smelting is obtained from oxidizing the concentrate's Fe and S. The vertical lance consists of two pipes-the inner for supplying supplementary hydrocarbon fuel, the annulus for supplying oxygen-enriched air.

The Technology

One of the additional uses of Ausmelt technology is to allow for the recovering of copper from non-sulfide materials, particularly slags and sludges. Its ability to control air and fuel inputs means that conditions can be changed from oxidizing to reducing without transferring the material to a second furnace. This is particularly effective for smelting Cu/Ni hydrometallurgical residues.

The Technology can be applied to a wide range of applications and uses. This flexibility is due to its inherent ability to be operated and controlled over a wide range of oxygen potentials, from strongly oxidizing, neutral, through to strongly reducing. Operating temperatures range from 900°C (lead) to 1400°C and above (ferrous applications). This flexibility is shown in Figure 2.



Figure 2: Operating Flexibility of Ausmelt Technology

The Ausmelt furnace system is based on the use of a top submerged lance to inject combustion gases and fuel into a molten slag bath. The main features of the technology are illustrated in Figure 3.



Figure 3: Features of Ausmelt Technology

The technology provides a variety of benefits and features including:

  • Submerged injection resulting in rapid mixing and fast reaction rates
  • High reaction intensity allowing a high level of productivity per unit area of furnace. This minimizes the heat losses and fuel requirements per unit of product
  • The use of non-consumable lances, using controlled cooling to solidify slag on its outer surface, protecting it from attack in a highly aggressive environment
  • The use of a range of fuels, including coal, natural gas and fuel oils. This allows those fuels most readily and economically available to be used
  • The ability to use oxygen enriched air to raise productivity, reduce offgas volumes and increase acid gas tenors when needed
  • The capability to easily control the degree of oxidation and reduction by adjusting the fuel to oxygen ratio in the lance, and the addition of reductant coal with the feed
  • The use of a stationary, well-sealed reactor to minimize fugitive emissions
  • The ability to implement installations as either new plants or in retrofit installations
  • The ability to use simple agglomeration and feed-rate control systems
  • Waste heat recovery, when required, using conventional equipment
  • A plant that is simple to operate and does not require a large number of highly skilled operators
  • The use of advanced control systems to improve process control and product quality
  • High level control of the process chemistry to ensure that the slag produced is disposable without further treatment
  • High level control of the process chemistry for removal of impurities such as arsenic, antimony, bismuth and halides

Summary

Ausmelt and Isasmelt smelting is done in vertically aligned cylindrical furnaces ~3.5 m diameter and 12 m high. The smelting entails:

  • Dropping moist concentrate, flux and recycle materials into a molten matte/slag bath in a hot furnace
  • Blowing oxygen-enriched air through a vertical lance into the matte/slag bath

Most of the energy for smelting is obtained from oxidizing the concentrate's Fe and S. The vertical lance consists of two pipes-the inner for supplying supplementary hydrocarbon fuel, the annulus for supplying oxygen-enriched air. The outer pipe penetrates ~0.3m into the bath. The inner pipe ends ~1 m above the bath. The oxygen-enriched blast is swirled down the lower part of the lance by helical swirl vanes. This causes rapid heat extraction from the lance into the cool blast and solidification of a protective slag coating on the lance`s outer surface. This is a unique feature of the process. The principal product of the furnace is a matte/mixture. It is tapped into a hydrocarbon fired or electric settling furnace. The products, after settling, are 60% matte and 0.7% Cu slag.

기술 자료 검색

검색할 어구를 입력하십시오:

검색 범위

본문
키워드

머릿글
요약

이 문서는 전체 문서 중 일부분입니다. 이 주제에 대해 더 읽고 싶으시면 아래 링크를 클릭하시면 됩니다.

물리적 특성은 Total Materia 데이터베이스 내 많은 재질에서 검토하실 수 있습니다.

데이터는 규격의 공식 정보와 Total Materia의 강력한 상호 참조 표를 통해 검색 가능하며 이는 물리적 특성 데이터 검색에 매우 효과적일 것입니다!

신속 검색에 검색할 재질명을 입력합니다. 원하신다면 국가/규격을 지정하신 후 검색 버튼을 클릭합니다.


관심 있는 재질을 선택하신 후, 물리적 특성 링크를 클릭하셔서 선택된 재질의 데이터를 검토합니다. 물리적 특성 데이터 기록의 개수는 링크 옆에 괄호 안에 표시됩니다.


물리적 특성은 원래 데이터 값에 따라 표시됩니다. 규격에 의한 공식 데이터는 공식 탭에서 찾을 수 있고, 다른 출처를 통해 검색된 재질의 데이터는 자신의 탭에 표시 됩니다.


유사 재질 탭에는 원래 재질과 비슷하며 물리적 특성이 포함된 재질을 표시합니다. 등가 재질 검색 시에 매우 유용할 수 있습니다!


일반 탭은 특성 데이터에 대한 일반적인 개요를 제공하며 추가 조사를 위한 유용한 출발점으로 사용될 수 있습니다.


Total Materia 데이터베이스를 사용해 보실 수 있는 기회가 있습니다. 저희는 Total Materia 무료 체험을 통해 150,000명 이상의 사용자가 이용하고 있는 커뮤니티로 귀하를 초대합니다.