The invention belongs to the field of
metal smelting, and particularly relates to a method for recycling valuable metals from
zinc-containing
tin materials. The method comprises the following steps that 1, the
zinc-containing
tin materials and reducing raw
coal are mixed and added into a
rotary kiln for
roasting to obtain
smoke dust and
kiln slag; 2, the
smoke dust is oxidized and leached with
sulfuric acid and an
oxidizing agent to obtain
leachate and leached residues; 3, the
leachate is carried out purification and
impurity removal after the
leachate is subjected to extraction to recycle
indium and
germanium, then the leachate is electrolyzed to obtain
metal zinc, and the leached residues are returned to the
rotary kiln or a fuming furnace for treatment; 4, the
kiln slag is subjected toball milling and then is mixed with
coke to be added into a reduction furnace to be smelted to obtain
metal crude
tin and reduced furnace
slag; and 5, vacuum
smelting is carried out on the crude tin to obtain fine tin and metal lead, flotation and
magnetic separation are carried out on the reduced furnace slag, and the
magnetic separation tailings can be used as raw materials for
cement production. According to the method, metals such as lead, zinc and
tin can be efficiently separated and recycled, fewer three wastes are generated, the cost is low, the technological process is short, the device is simple, the adaptability is high, and popularization and application are easy to carry out.