Aluminum scrap in electrical engineering and packaging

Sources of aluminum scrap

Основными источниками промышленности по переработке алюминиевого лома в развитых промышленных странах являются:

  • строительство;
  • транспорт;
  • бытовые и спортивные товары;
  • электротехническая промышленность;
  • food packaging.

Electrical Aluminum Scrap

Electric cables account for a large share of aluminum scrap from the electrical industry.. Alloys are traditionally used for the manufacture of cables 1350 and 6201, and for electric buses and other large conductors, an aluminum alloy is often used 6101.

Recently, they often began to use alloys of the 8xxx series for the manufacture of electric cables, such as 8017 and 8176, which have increased resistance to creep. However, their use is limited to, that they cannot be used for subsequent processing into 1xxx series alloys. A small number of cast aluminum alloys of the 1xxx series are also used in the electrical industry..

Impurities in electrical scrap

Потенциальными источниками примесей и загрязнений в электрических изделиях являются:

  • стальная проволока от усиленных сталью кабелей;
  • copper wire, перемешанные с алюминиевыми проводами;
  • plastics, которые применяют для изоляции проводов и кабелей;
  • омедненные алюминиевые провода.

Packing aluminum scrap

Применение алюминия в упаковке продуктов подразделяется на две подкатегории: жесткие контейнеры (банки) и фольга. Алюминиевые банки для прохладительных напитков – сокращенно: алюминиевые пивные банки – начали применять в США в 1959 year. Two decades later, aluminum cans dominated the packaging of soft drinks and beer.

Although some competition with plastic and glass bottles still remains, they say, what the average american consumes about 350 aluminum cans per year. This situation is facilitated by the exceptional ability of aluminum to be recycled again into aluminum..

Aluminum scrap beer cans

Typical aluminum can изготавливают из двух алюминиевых сплавов:

  • Bank body - 83 % total weight – made of alloy 3004.
  • Крышку и «открывашку» (17 %) делают из более прочного алюминиевого сплава 5182.

Processing a mixture of these alloys is a problem, since a simple remelting of them gives an alloy, which contains too much magnesium, to apply it as an alloy 3004, and too much manganese, what to consider it an alloy 5182. As a result, this melt is usually diluted with primary aluminum or low alloy scrap., to get alloys, suitable for making beer cans.

Aluminum can manufacturers are trying to develop such an aluminum alloy, which could be used for manufacturing, like a can body, and its covers with an “opener”. This would allow truly direct processing of such an alloy..

Алюминиевая мягкая упаковка

К упаковочному алюминиевому лому относятся:

  • мягкие емкости, подносы и одноразовые емкости для напитков.

Aluminum strip and aluminium foil, которая применяется для упаковки в виде мягких емкостей, trays and disposable beverage containers, обычно изготавливается из алюминиевых сплавов 1ххх или 8011. However, such packaging is composite and contains a large amount of paper and plastic., which must be separated from thin aluminum foil before being sent for remelting. Therefore, the cost of processing such "scrap" is excessively high and it is almost never applied..

Aluminum Scrap Contaminants

Pollutants, which are characteristic of packaging scrap include, including:

  • бумагу и пластик;
  • стальные банки среди алюминиевых;
  • stones, mud, песок и стекло;
  • органические покрытия и краски на поверхности банок;
  • excessive moisture.

Источник: Mark E. Schlesinger, Aluminum Recycling, 2011