hot slags in the melting pots in the copper processing factory. copper slag is a by-product of copper extraction by smelting.

asia become casting color copper damaged disaster environment environmental equipment extraction factory flame floats foundry horizontal hot image images impurities industrial industry iron issue large manufacture manufacturing many melting metal mine molten motion ore outdoors people photography photos pot pots process processing produces product products quenched sky slag slags smelter smelting smoke steel usa vessel which work