Method for recovering gold, silver, iron and lead from acid calcination slag by magnetization chlorination process

Abstract

The invention discloses a method to recover the gold, silver, iron and lead from the acidiation roasted cinder by a magnetic chlorination method, which is characterized in that the method comprises two sections, one is that the gold, silver, lead, and copper in the cinder are volatilized as a chloride gas through the high temperature chlorination roasting, and the gold, silver, copper and lead are recovered through the condensed gas; the other is that the iron is recovered by the process that the coal dust is filled during the granulation of the cinder, the magnetic reduction roasting is done with the chlorination roasting, the ferric oxide is reduced to the ferroferric oxide, and the processed cinder is ground and selected magnetically. Thanks to the recovering method, the recovery rate of the gold and silver is above 95%, the iron recovery rate is above 85%, and the lead recovery rate is above 90%, the production cost is about 300 RMB per ton, the profit is over 700 RMB per ton, so that a multiple billion RMB profit is harvested, and the waste of the limited resource is reduced. The method to recover the gold, silver, iron and lead from the acidiation roasted cinder by a magnetic chlorination method has the advantages of simple process, high efficiency, low smelting cost, comprehensive utilization of the ore resources, elimination of the environment pollution, and economic benefit growth of enterprise.

Description

technical field [0001] The invention relates to a method for recovering metals from metallurgical tailings waste slag, in particular to a method for recovering gold, silver, iron and lead from acidified roasting slag by magnetization chlorination. Background technique [0002] As a relatively effective method for treating refractory metallurgical concentrates, the prior art gold concentrate acidification roasting-cyanidation process has been more and more applied. For example, there are more than 8 manufacturers using this process in a mining area in a certain province, with a total daily processing capacity of more than 2,500 tons. The tailings produced are more than 2000 tons per day. Because the grades of gold, silver, iron and lead contained in the tailings are all low, only about 1.5-2.5g / t, 50-150g / t, 35% and 3% respectively, it is difficult to effectively recover, so all smelters directly Abandoned, the tailings are no longer reprocessed. It is preliminarily estima...

AI Technical Summary

Problems solved by technology

On the one hand, the above-mentioned smelting process pollutes the environment, and on the other hand, it causes serious waste of resources and other defects.

[0003] In addition, some enterprises used to immerse lead in chloride salt, but they had to give up due to various reasons such as serious equipment corrosion, high cost, and difficulty in recovery from the liquid phase, and failed.

The same is true for the recovery of iron. There are many solutions to be explored, such as flotation and magnetic separation, but they all failed in the end and have not been applied industrially; and the recovery of gold and silver has not found an effective method for many years.

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