Desorption electrolysis system for low-grade gold oxide ores

Abstract

The utility model discloses a desorption electrolysis system for low-grade gold oxide ores. The desorption electrolysis system comprises a gold-loaded carbon conveying pipeline, a nitric acid pool, a carbon-rich pickling tank, a desorption column, a filter and an electrolytic tank, a discharge end of the gold-loaded carbon conveying pipeline and a liquid outlet of the nitric acid pool are communicated with a liquid inlet of the carbon-rich pickling tank, a liquid outlet of the carbon-rich pickling tank is communicated with a liquid inlet of the nitric acid pool, and a discharge port of the carbon-rich pickling tank is communicated with a feed port of the desorption column; a liquid outlet of the desorption column is communicated with the filter, and a liquid outlet of the filter is communicated with a liquid inlet of the electrolytic bath. The utility model has the advantages that the connecting structure is simple and easy to realize, the effect of dissolving gold and silver elements in electrolyte is improved, gold and silver are ensured to be fully separated from activated carbon in the desorption process, the effective utilization of resources is realized, and the production cost of enterprises is reduced.

Description

Technical fields:

[0001] This utility model relates to a desorption electrolysis system, and more particularly to a desorption electrolysis system for low-grade oxidized gold ore. Background technology:

[0002] The whole-sludge cyanidation carbon-in-pulp process specifically involves crushing all the gold ore sequentially through a jaw crusher and a cone crusher, then grinding it into slurry using a ball mill, followed by cyanidation leaching, and then using activated carbon to directly adsorb the dissolved gold from the slurry to form gold-loaded carbon. Finally, gold mud is obtained through desorption and electrolysis.

[0003] However, in low-grade oxidized gold ore treated by heap leaching, there are various elements such as gold, silver, copper, iron, and lead. Except for gold and silver, which have recovery value, other metal elements will affect the leaching and adsorption of gold and silver during the leaching process, resulting in a decrease in the utilization rate of activated carbon. The long leaching time and the long adsorption cycle required for gold-loaded carbon result in a large amount of impurities such as fine mud and alkaline salts being adsorbed. These impurities form a coating on gold and silver complexes, making it impossible to effectively desorb gold and silver during the desorption process, which seriously affects the separation of gold and silver from activated carbon during the desorption process. Utility Model Content:

[0004] The purpose of this invention is to provide a desorption electrolysis system for low-grade oxidized gold ore with a simple connection structure that ensures that gold and silver are fully separated from activated carbon during the desorption process.

[0005] This utility model is implemented by the following technical solution: The purpose of this patent is to provide a desorption electrolysis system for low-grade oxidized gold ore, which includes a gold-carrying carbon conveying pipeline, a nitric acid tank, a carbon-rich acid washing tank, a desorption column, a filter, and an electrolytic cell; the outlet end of the gold-carrying carbon conveying pipeline and the outlet of the nitric acid tank are connected to the inlet of the carbon-rich acid washing tank, the outlet of the carbon-rich acid washing tank is connected to the inlet of the nitric acid tank, the outlet of the carbon-rich acid washing tank is connected to the inlet of the desorption column, the outlet of the desorption column is connected to the filter, and the outlet of the filter is connected to the inlet of the electrolytic cell.

[0006] Furthermore, it also includes a nitric acid replenishment pipeline, the outlet of which is connected to the inlet of the nitric acid tank.

[0007] Furthermore, it also includes a lean carbon acid washing tank, wherein the outlet of the desorption column is connected to the inlet of the lean carbon acid washing tank.

[0008] Furthermore, it also includes a heater, with the outlet of the electrolytic cell connected to the inlet of the heater, and the outlet of the heater connected to the inlet of the desorption column.

[0009] The advantages of this utility model are: 1. The connection structure of this utility model is simple and easy to implement. By sending the gold-loaded carbon to a carbon-rich acid washing tank, nitric acid is used to remove impurities and clean the gold-loaded carbon, thereby removing various impurities and other calcium-containing substances attached to the surface of the gold-loaded carbon, increasing the active area on the carbon surface, and enhancing the effect of dissolving gold and silver elements in the electrolyte. This ensures that gold and silver are fully separated from the activated carbon during the desorption process. In addition, the acid washing process can also remove copper elements contained in the gold-loaded carbon, avoiding cross-mixing of gold and copper elements and increasing the difficulty of desorption; 2. By heating the electrolyte after electrolysis and then returning it to the desorption column for reuse, the effective utilization of resources is achieved, reducing the production costs of enterprises. Attached image description:

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] 1. Gold-loaded carbon conveying pipeline, 2. Nitric acid tank, 3. Rich carbon acid washing tank, 4. Desorption column, 5. Filter, 6. Electrolytic cell, 7. Nitric acid replenishment pipeline, 8. Lean carbon acid washing tank, 9. Heater. Detailed implementation method:

[0013] Example: Figure 1 As shown, a desorption electrolysis system for low-grade oxidized gold ore includes a gold-carrying carbon conveying pipeline 1, a nitric acid tank 2, a carbon-rich acid washing tank 3, a desorption column 4, a filter 5, an electrolytic cell 6, a supplementary nitric acid pipeline 7, a lean-carbon acid washing tank 8, and a heater 9. The outlet of the gold-carrying carbon conveying pipeline 1 and the outlet of the nitric acid tank 2 are connected to the inlet of the carbon-rich acid washing tank 3. The outlet of the carbon-rich acid washing tank 3 is connected to the inlet of the nitric acid tank 2. The outlet of the supplementary nitric acid pipeline 7 is connected to the inlet of the nitric acid tank 2.

[0014] The outlet of the rich carbonate washing tank 3 is connected to the inlet of the desorption column 4, the outlet of the desorption column 4 is connected to the filter 5, and the outlet of the desorption column 4 is connected to the inlet of the lean carbonate washing tank 8; the outlet of the filter 5 is connected to the inlet of the electrolytic cell 6, the outlet of the electrolytic cell 6 is connected to the inlet of the heater 9, and the outlet of the heater 9 is connected to the inlet of the desorption column 4.

[0015] Working principle: The gold-loaded carbon first enters the carbon-rich acid washing tank 3, where nitric acid is used to remove impurities and clean the gold-loaded carbon. This removes various impurities and other calcium-containing substances attached to the surface of the gold-loaded carbon, increases the active area on the carbon surface, and enhances the effect of dissolving gold and silver elements in the electrolyte. This ensures that gold and silver are fully separated from the activated carbon during the desorption process. In addition, the acid washing process can remove the copper element contained in the gold-loaded carbon, avoiding cross-contamination between the gold and copper elements and increasing the difficulty of desorption. The acid-washed gold-loaded carbon is sent to the desorption column 4 for desorption, separating the gold and silver from the activated carbon. The gold-loaded carbon becomes lean carbon and is sent to the lean carbon acid washing tank 8 for acid washing and regeneration. It is then used to adsorb dissolved gold from the slurry. The electrolyte after absorbing gold and silver is called precious solution. It is first filtered by filter 5 to remove impurities from the activated carbon before entering the electrolytic cell 6 for electrolysis. Ionization occurs in a high current and low voltage environment. In the anodic electric field in the electrolytic cell 6, the gold and silver ions in the precious solution are converted into elemental mud to obtain the product gold and silver mud. The precious solution becomes lean solution and is heated by heater 9 before being sent back to the desorption column 4 for reuse, realizing the effective utilization of resources and reducing the production cost of enterprises.

[0016] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A desorption electrolysis system for low-grade oxidized gold ore, characterized in that, It includes a gold-loaded carbon conveying pipeline, a nitric acid tank, a carbon-rich acid washing tank, a desorption column, a filter, and an electrolytic cell; the outlet of the gold-loaded carbon conveying pipeline and the outlet of the nitric acid tank are connected to the inlet of the carbon-rich acid washing tank, the outlet of the carbon-rich acid washing tank is connected to the inlet of the nitric acid tank, the outlet of the carbon-rich acid washing tank is connected to the inlet of the desorption column, the outlet of the desorption column is connected to the filter, and the outlet of the filter is connected to the inlet of the electrolytic cell.

2. The desorption electrolysis system for low-grade oxidized gold ore according to claim 1, characterized in that, It also includes a nitric acid replenishment pipeline, the outlet of which is connected to the inlet of the nitric acid tank.

3. The desorption electrolysis system for low-grade oxidized gold ore according to claim 1, characterized in that, It also includes a lean carbon acid washing tank, and the outlet of the desorption column is connected to the inlet of the lean carbon acid washing tank.

4. The desorption and electrolysis system for low-grade oxidized gold ore according to claim 1, characterized in that, It also includes a heater, the outlet of the electrolytic cell is connected to the inlet of the heater, and the outlet of the heater is connected to the inlet of the desorption column.

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