Method for comprehensively recovering valuable metals from complex alloys containing stibium, tellurium, indium, germanium and silver

Abstract

The invention discloses a method for comprehensively recovering valuable metals from complex alloys containing stibium, tellurium, indium, germanium and silver. The method comprises the following steps of: alkaline roasting and transformation: mechanically and uniformly stirring smashed and ball milled alloy powder and caustic soda flakes according to a weight ratio of 1:2, loading into an automatic control electric roasting furnace and heating to a temperature of 850 DEG C for 10 hours and taking out of the furnace and then smashing for later use; production of germanium: acidizing roasted powder through sulfuric acid, then obtaining germanium tetrachloride through a process for distilling and extracting the germanium and producing high-purity germanium ingots through rectification, hydrolysis, reduction and zone-melting; recovery of tellurium and silver: washing and filter-pressing acid sludge mixed liquor in the kettle after distilling the germanium to obtain residues; recovery of indium and stibium: neutralizing filter-pressed acid liquor by using alkali liquor to have the pH value of 5 to obtain an indium-stibium mine, and leaching by using dilute sulphuric acid, wherein a final pH value is 1.0-1.5, the content of stibium in leached residues is 30 percent; and extracting, replacing, fusion casting, electrolyzing and refining leach liquor through P204 to obtain 4N high-purity indium ingots.

Description

technical field

[0001] The invention relates to a method for comprehensively recovering valuable metals from complex alloys containing antimony, tellurium, indium, germanium and silver. Background technique

[0002] Existing complex alloys are rich in various valuable metals such as antimony, tellurium, indium, germanium, and silver. There is no public report on how to carry out comprehensive recycling. Contents of the invention

[0003] Aiming at the deficiencies in the prior art, the present invention designs a method for comprehensively recovering valuable metals from complex alloys containing antimony, tellurium, indium, germanium, and silver. The technical scheme is:

[0004] A method for comprehensively recovering valuable metals from a complex alloy containing antimony, tellurium, indium, germanium, and silver, the steps of which are:

[0005] Alkaline roasting transformation: mechanically mix the crushed and ball-milled alloy powder and caustic soda at a weight r...