A method for removing lead by vacuum distillation of noble lead materials

Abstract

The invention relates to a deleading method through vacuum distillation of noble lead materials, wherein the noble lead materials are placed into a vacuum metallurgical furnace, heated to the temperature of more than 100 DEG C, maintained at the temperature for a period of time, and subjected to distillation separation by the difference of vapor pressure of various alloy elements; and gold and silver are enriched in residue and lead, stibium, bismuth and the like are enriched in volatile, and all the elements are metallic products, thereby facilitating further refining treatment. The technical indexes reached by the method are as follows: the content of noble metal such as the silver and the like in lead bismuth alloy is less than 0.05 percent; both the content of the lead and the content of the bismuth in noble-metal alloy are less than 1 percent; the vacuum refining yield of noble metal is more than 98 percent; as for noble lead materials with high arsenic content (approximately 5 percent), more than 85 percent of arsenic can be removed through vacuum distillation; and each ton of the materials need approximately 300 to 450 degrees of power, and the value is reduced by approximately 7 percent compared with the prior art.

Description

1. Technical field: [0001] The invention relates to a method for vacuum distillation and deleading of precious lead materials, a pyrometallurgical method, belonging to the technical field of heavy metal pyrometallurgy. 2. Background technology: [0002] Precious lead is a by-product of heavy metal metallurgy. The content of gold and silver is generally between 35% and 60%. The rest is mostly lead, and there are also a small amount of impurities such as copper, arsenic, antimony, and bismuth. [0003] At present, most of the treatment processes in the world's producing countries are oxidation refining. The method is to put the precious lead material into the converter to melt, and blow air into the air duct to oxidize the impurities into scum and recover the flue gas, and send it to another process for further processing. Reduction smelting; the rest is gold-silver alloy, which is refined by electrolytic process. In this process, copper and bismuth are elements that are diff...

AI Technical Summary

Problems solved by technology

Moreover, the viscosity of copper and bismuth is relatively high, and gold and silver are often entrained in slag formation, resulting in a decrease in the recovery rate of gold and silver.

In addition, most of arsenic and antimony generate toxic As in the process of blowing 2 o 3 and Sb 2 o 3 Smoke dust and arsenite slag need a complete dust collection system, otherwise it will pollute the environment

This method takes a long time for blowing, has a lot of slag and dust, high energy consumption, and poor production environment