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

A technology of chlorination and recovery of gold, which is applied in the fields of silver, iron and lead, and recovery of gold, which can solve problems such as high cost, difficulty in recovery, and environmental pollution, and achieve the goal of increasing economic benefits of enterprises, eliminating environmental pollution, and reducing smelting costs Effect

Inactive Publication Date: 2008-07-23
张伟晓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for reclaiming gold, silver, iron and lead from acidified roasting slag by magnetization chlorination, comprising step 1 and step 2;

[0019] Said step 1 includes:

[0020] (1) Mix evenly with 18%~50% concentration of sodium chloride and 1~3mm of coal powder and cinder;

[0021] (2), by weight, slag: sodium chloride: coal powder = 1: 0.05~0.5: 0.02~0.2, granulate after stirring and mixing, and its mixing time is 1~3 hours, so that it forms a particle size of 20- 30mm pellets;

[0022] (3) After drying, consolidation and roasting, the roasting temperature is 900-1250°C, and the roasting time is 1-3 hours;

[0023] (4) Collect the roasting flue gas, and spray the flue gas at a temperature of 1000 ° C to 1050 ° C during the roasting process to cool down to the outlet temperature of 20 ° C to 50 ° C, so that the chloride crystals of silver, copper and lead are precipitated, and the output is recovered by filtration Gold, lead chloride, and silver chloride solids...

Embodiment 2

[0030] The method for reclaiming gold, silver, iron and lead from acidified roasting slag by magnetization chlorination method is made up of step 1 and step 2, and described step 1 comprises:

[0031] (1) Mix uniformly with 1.2-2.8mm of coal powder and tailings with 19%-45% concentration of sodium chloride;

[0032] (2), by weight, slag: sodium chloride: coal powder = 1: 0.06~0.49: 0.025~0.19, granulate after stirring and mixing, the mixing time is 1.5~2.5 hours, so that the particle size is 22-28mm pellets;

[0033] (3) After drying, consolidation and roasting, the roasting temperature is 950-1200°C, and the roasting time is 1.2-2.8 hours;

[0034] (4) Collect the roasting flue gas, and spray the flue gas at a temperature of 1000 ° C to 1050 ° C during the roasting process to cool down to the outlet temperature of 20 ° C to 50 ° C, so that the chloride crystals of silver, copper and lead are precipitated, and the output is recovered by filtration Gold, lead chloride, and si...

Embodiment 3

[0038] Referring to Fig. 1, the magnetic chlorination method of solid is mixed with additives of acidified roasted slag, coal powder and liquid, granulated, consolidated, roasted, and the solid part of the roasted product is sent to a ball mill for ball milling. The particle size of -200 mesh should account for 80%, and then the existing magnetic separation process is used for magnetic separation, and the concentrate obtained by magnetic separation is filtered with water to form iron concentrate, and the tailings obtained by magnetic separation are sent to the tailings mine dam. After roasting, the hot gas is mixed with cooling water, and the flue gas with an inlet temperature of 1000-1050°C is cooled to an outlet temperature of 20-50°C by spraying cold water, and part of the exhaust gas is discharged into the atmosphere, and part of the filtered solid is silver copper. Chloride crystallization of lead, while gold is produced in the form of simple substances, the solids produc...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/08C22B3/06
CPCY02P10/20
Inventor 张伟晓
Owner 张伟晓
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