A simple economic analysis of this technique was further conducted
and is shown in Table 1. It should be noted that calculation
was conducted based on the price of items in China. Electric cost
involves the cost of crushing, heating and agitation; labor cost was
calculated by considering that it approximately accounts for 5% of
total cost; the price of Al is the price of waste Al metal. Moreover,
the exchange rate is 6.1 CNY USD1