Apparatus and method for extracting gold from gold concentrate by non-cyanide leaching

Abstract

The application discloses a device and method for extracting gold from gold concentrate by non-cyanide leaching, and the device comprises a tank body, a detachable end cover is arranged on the upper end of the tank body, a driving motor is fixedly arranged on the upper end of the end cover, a stirring shaft is fixedly connected to the output end of the driving motor and penetrates through the end cover, the stirring shaft is provided with a stirring paddle, a pressure adjusting plate which is threadedly connected with the stirring shaft is further sleeved on the stirring shaft, the adjusting plate is in interference fit with the inner wall of the tank body, the stirring shaft is provided with a reversing thread matched with the adjusting plate, and the adjusting plate is reciprocally displaced along the stirring shaft to adjust the pressure in the tank body by rotating the stirring shaft. The application not only reduces the harm of leaching reagents to human bodies, but also improves the gold extraction rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gold concentrate, in particular to a device and method for extracting gold from gold concentrate by non-cyanide leaching. BACKGROUND

[0002] Currently, the main method for extracting gold from gold concentrate is cyanide leaching, but this method has high reagent toxicity, which not only easily corrodes equipment, but also affects human health, so it is an urgent technical problem in the art to develop a higher safety and higher gold extraction rate extraction process. SUMMARY

[0003] Based on the technical problems existing in the background technology, the present application provides a device and method for extracting gold from gold concentrate by non-cyanide leaching, which not only reduces the harm of leaching reagents to the human body, but also improves the gold extraction rate.

[0004] The device for extracting gold from gold concentrate by non-cyanide leaching provided by the present application comprises a tank body, a cover is detachably arranged at the upper end of the tank body, a driving motor is fixedly arranged at the upper end of the cover, a stirring shaft is fixedly connected to the output end of the driving motor and penetrates the cover, the stirring shaft is provided with a stirring paddle, a pressure adjusting plate is further sleeved on the stirring shaft and threadedly connected with the stirring shaft, the adjusting plate is in interference fit with the inner wall of the tank body, the stirring shaft is provided with a reversing thread matched with the adjusting plate, and the adjusting plate is reciprocally displaced along the stirring shaft to adjust the pressure in the tank body by rotating the stirring shaft.

[0005] Preferably, the reversing thread comprises first and second thread grooves arranged in staggered helix, both ends of the first and second thread grooves are communicated, and a plug is fixedly arranged on one side of the pressure adjusting plate close to the stirring shaft and inserted into the first / second thread groove.

[0006] Preferably, an extension limiting rod is further fixedly arranged at the upper end of the pressure adjusting plate, and one end of the extension limiting rod away from the pressure adjusting plate penetrates the cover and is fixedly connected thereto.

[0007] Preferably, the tank body is further provided with a refrigeration module for cooling the inside of the tank body and a heating module for heating the inside of the tank body.

[0008] The method for extracting gold from gold concentrate by non-cyanide leaching provided by the present application comprises the following steps:

[0009] S1: ball milling the gold concentrate;

[0010] S2: adding the ball-milled gold concentrate in S1 into the tank body, and adding a leaching solution into the tank body;

[0011] S3: The stirring shaft is controlled to rotate by the drive motor. The stirring shaft drives the material to rotate. At the same time, the pressure regulating plate moves back and forth along the reversing thread on the stirring shaft to continuously regulate the pressure inside the tank.

[0012] S4: During the leaching process, the heating module heats the tank to the preset temperature, then the heating module is turned off and the cooling module is turned on to cool the tank to the preset temperature. The heating module is then turned on again for heating and the cooling module is turned on for cooling.

[0013] S5: Separate the treated leachate and leachate residue.

[0014] Preferably, the mass-to-volume ratio of the gold concentrate to the leachate is 1g:2-4mL.

[0015] Preferably, the leachate comprises the following raw materials in parts by weight: 10-20 parts lime-sulfur mixture, 1-5 parts sodium sulfate, 1-5 parts sodium hexametaphosphate, 1-3 parts chitosan surfactant, 1-3 parts sodium dodecylbenzenesulfonate, and 100 parts water.

[0016] Preferably, the chitosan surfactant is prepared by grafting carboxyl chitosan with 3-chloro-2-hydroxypropyldehydroabietic ammonium chloride.

[0017] Preferably, the maximum pressure inside the tank after adjustment by the pressure regulating plate in S3 is 0.4-0.6 MPa.

[0018] Preferably, the final heating temperature in S4 is 60-80℃, the final cooling temperature is 5-15℃, the cooling and heating rates are both 1-3℃ / min, and the leaching time is 3-5h.

[0019] Beneficial technical effects of the present invention:

[0020] (1) The stirring shaft inside the tank of the present invention is provided with a stirring paddle and a pressure regulating plate, and the stirring shaft is engaged with the pressure regulating plate through a reversing thread. Thus, while the stirring paddle is stirring, the pressure regulating plate continuously changes the pressure inside the tank, thereby improving the leaching effect of gold concentrate. Moreover, the structure of the pressure regulating plate reversing in the present invention is simple and can be achieved without a forward and reverse motor.

[0021] (2) The present invention uses temperature and pressure variation to leach gold concentrate, which not only makes the leaching conditions mild but also improves the leaching effect of gold concentrate. In addition, the leaching solution added in the present invention includes components such as lime sulfur mixture, sodium sulfate, sodium hexametaphosphate, chitosan surfactant, and sodium dodecylbenzene sulfonate. These components are not only low in toxicity and low in corrosiveness to equipment, but also significantly improve the gold recovery rate in gold concentrate. Moreover, chitosan surfactant and sodium dodecylbenzene sulfonate have a synergistic effect in promoting the improvement of recovery rate. Attached Figure Description

[0022] Fig. 1 This is a schematic diagram of the apparatus for non-cyanide leaching gold extraction from gold concentrate proposed in this invention.

[0023] Fig. 2 This is a partial enlarged AA view of the apparatus for non-cyanide leaching gold extraction from gold concentrate proposed in this invention.

[0024] In the diagram: 1-tank body, 2-pressure regulating plate, 3-end cover, 4-telescopic limit rod, 5-drive motor, 6-stirring paddle, 7-stirring shaft, 8-insert block, 9-first threaded groove, 10-second threaded groove. Detailed Implementation

[0025] Reference Figs. 1-2 The apparatus for non-cyanide leaching gold extraction from gold concentrate proposed in this invention includes a tank body 1. An end cap 3 is detachably mounted on the upper end of the tank body 1. A drive motor 5 is fixedly mounted on the upper end of the end cap 3. The output end of the drive motor 5 passes through the end cap 3 and is fixedly connected to a stirring shaft 7. The stirring shaft 7 is equipped with a stirring paddle 6. A pressure regulating plate 2, threadedly connected to the stirring shaft 7, is also fitted onto the stirring shaft 7. The regulating plate is interference-fitted with the inner wall of the tank body 1. The stirring shaft 7 is provided with a reversing thread that matches the regulating plate. By rotating the stirring shaft 7, the regulating plate moves back and forth along the stirring shaft 7 to adjust the internal pressure of the tank body 1. Furthermore, the tank body 1 of this invention is also equipped with a feed pipe (not shown in the figure) and a discharge pipe (not shown in the figure).

[0026] Specifically, the reversing thread includes a first thread groove 9 and a second thread groove 10 with staggered spiral distribution. Both ends of the first thread groove 9 and the second thread groove 10 are connected. The pressure regulating plate 2 is fixedly provided with a plug 8 that is inserted into the first thread groove 9 / second thread groove 10 on the side near the stirring shaft 7.

[0027] In addition, a telescopic limiting rod 4 is fixedly installed on the upper end of the pressure regulating plate 2. The end of the telescopic limiting rod 4 away from the pressure regulating plate 2 passes through the end cover 3 and is fixedly connected to it. The telescopic limiting rod 4 restricts the rotation of the pressure regulating plate 2 relative to the stirring shaft 7, thereby realizing its axial displacement along the stirring shaft 7.

[0028] To further improve the leaching effect of gold concentrate, tank 1 is also equipped with a cooling module (not shown in the figure) for cooling the interior and a heating module (not shown in the figure) for heating the interior. The heating and cooling modules can be made using existing technologies.

[0029] The present invention has an agitator and a pressure regulating plate installed on the agitator shaft inside the tank. The agitator shaft is connected to the pressure regulating plate through a reversing thread, so that while the agitator is agitating, the pressure regulating plate continuously changes the pressure inside the tank, thereby improving the leaching effect of gold concentrate. Moreover, the structure of the pressure regulating plate reversing is simple and does not require a forward and reverse motor.

[0030] Example 1

[0031] The method for non-cyanide leaching extraction of gold from gold concentrate proposed in this invention comprises the following steps:

[0032] S1: The gold concentrate is ball-milled, and at least 90% of the gold concentrate after ball milling has a particle size of less than 200 mesh.

[0033] S2: Add the ball-milled gold concentrate from S1 into the tank, and at the same time add the leachate into the tank. The mass-volume ratio of gold concentrate to leachate is 1g:3mL.

[0034] S3: The stirring shaft is controlled to rotate by the drive motor. The stirring shaft drives the material to rotate. At the same time, the pressure regulating plate moves back and forth along the reversing thread on the stirring shaft to continuously regulate the pressure inside the tank. The maximum pressure inside the tank is 0.5MPa.

[0035] S4: During the leaching process, the heating module heats the tank to the preset temperature, then the heating module is turned off and the cooling module is started to cool the tank to the preset temperature. The heating module is then started again for heating and the cooling module is started for cooling. The final temperature of heating is 70℃, the final temperature of cooling is 10℃, the rate of heating and cooling is 2℃ / min, and the leaching time is 4h.

[0036] S5: Separate the treated leachate and leachate residue.

[0037] The leachate contains the following raw materials in parts by weight: 15 parts lime-sulfur mixture, 3 parts sodium sulfate, 3 parts sodium hexametaphosphate, 2 parts chitosan surfactant, 2 parts sodium dodecylbenzenesulfonate, and 100 parts water. The chitosan surfactant is prepared by grafting carboxyl chitosan with 3-chloro-2-hydroxypropyldehydroabietic ammonium chloride.

[0038] The gold recovery rate was 82.1% after the leachate was treated by potentiometric reduction.

[0039] Example 2

[0040] The method for non-cyanide leaching extraction of gold from gold concentrate proposed in this invention comprises the following steps:

[0041] S1: The gold concentrate is ball-milled, and at least 90% of the gold concentrate after ball milling has a particle size of less than 200 mesh.

[0042] S2: Add the ball-milled gold concentrate from S1 into the tank, and at the same time add the leachate into the tank. The mass-volume ratio of gold concentrate to leachate is 1g:2mL.

[0043] S3: The stirring shaft is controlled to rotate by the drive motor. The stirring shaft drives the material to rotate. At the same time, the pressure regulating plate moves back and forth along the reversing thread on the stirring shaft to continuously regulate the pressure inside the tank. The maximum pressure inside the tank is 0.4MPa.

[0044] S4: During the leaching process, the heating module heats the tank to the preset temperature, then the heating module is turned off and the cooling module is started to cool the tank to the preset temperature. The heating module is then started again for heating and the cooling module is started for cooling. The final temperature of heating is 60℃, the final temperature of cooling is 5℃, the rate of heating and cooling is 1℃ / min, and the leaching time is 3h.

[0045] S5: Separate the treated leachate and leachate residue.

[0046] The leachate contains the following raw materials in parts by weight: 10 parts lime-sulfur mixture, 1 part sodium sulfate, 1 part sodium hexametaphosphate, 1 part chitosan surfactant, 1 part sodium dodecylbenzenesulfonate, and 100 parts water. The chitosan surfactant is prepared by grafting carboxyl chitosan with 3-chloro-2-hydroxypropyldehydroabietic ammonium chloride.

[0047] The gold recovery rate was 80.7% after the leachate was treated by potentiometric reduction.

[0048] Example 3

[0049] The method for non-cyanide leaching extraction of gold from gold concentrate proposed in this invention comprises the following steps:

[0050] S1: The gold concentrate is ball-milled, and at least 90% of the gold concentrate after ball milling has a particle size of less than 200 mesh.

[0051] S2: Add the ball-milled gold concentrate from S1 into the tank, and at the same time add the leachate into the tank. The mass-volume ratio of gold concentrate to leachate is 1g:4mL.

[0052] S3: The stirring shaft is controlled to rotate by the drive motor. The stirring shaft drives the material to rotate. At the same time, the pressure regulating plate moves back and forth along the reversing thread on the stirring shaft to continuously regulate the pressure inside the tank. The maximum pressure inside the tank is 0.6MPa.

[0053] S4: During the leaching process, the heating module heats the tank to the preset temperature, then the heating module is turned off and the cooling module is started to cool the tank to the preset temperature. The heating module is then started again for heating and the cooling module is started for cooling. The final temperature of heating is 80℃, the final temperature of cooling is 15℃, the rate of heating and cooling is 3℃ / min, and the leaching time is 5h.

[0054] S5: Separate the treated leachate and leachate residue.

[0055] The leachate contains the following raw materials in parts by weight: 20 parts lime-sulfur mixture, 5 parts sodium sulfate, 5 parts sodium hexametaphosphate, 3 parts chitosan surfactant, 3 parts sodium dodecylbenzenesulfonate, and 100 parts water. The chitosan surfactant is prepared by grafting carboxyl chitosan with 3-chloro-2-hydroxypropyldehydroabimethanone chloride.

[0056] The gold recovery rate was 81.3% after the leachate was treated by potentiometric reduction.

[0057] Comparative Example 1

[0058] The leachate of this method contains the following raw materials in parts by weight: 15 parts lime-sulfur mixture, 3 parts sodium sulfate, 3 parts sodium hexametaphosphate, and 100 parts water. All other conditions are the same as in Example 1.

[0059] The gold recovery rate was 64.2% after the leachate was treated by potentiometric reduction.

[0060] Comparative Example 2

[0061] The leachate of this method contains the following raw materials in parts by weight: 15 parts lime-sulfur mixture, 3 parts sodium sulfate, 3 parts sodium hexametaphosphate, 4 parts chitosan surfactant, and 100 parts water. The chitosan surfactant is prepared by grafting carboxyl chitosan with 3-chloro-2-hydroxypropyldehydroabietic ammonium chloride. All other conditions are the same as in Example 1.

[0062] The gold recovery rate was 72.5% after the leachate was treated by potentiometric reduction.

[0063] Comparative Example 3

[0064] The leachate of this method comprises the following raw materials in parts by weight: 15 parts lime-sulfur mixture, 3 parts sodium sulfate, 3 parts sodium hexametaphosphate, 4 parts sodium dodecylbenzenesulfonate, and 100 parts water. All other conditions are the same as in Example 1.

[0065] The gold recovery rate was 70.8% after the leachate was treated by potentiometric reduction.

[0066] As can be seen from the results of Example 1 and Comparative Example 1, the chitosan surfactant and sodium dodecylbenzenesulfonate added to the leachate of the present invention can significantly improve the gold recovery rate; while the results of Example 1, Comparative Example 2 and Comparative Example 3 show that the chitosan surfactant and sodium dodecylbenzenesulfonate have a synergistic effect in improving the gold recovery rate.

[0067] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An apparatus for non-cyanide leaching gold extraction from gold concentrate, characterized in that, The device includes a tank body, with a detachable end cap at the upper end. A drive motor is fixedly mounted on the upper end of the end cap. The output end of the drive motor passes through the end cap and is fixedly connected to a stirring shaft. A stirring paddle is mounted on the stirring shaft, and a pressure regulating plate is threadedly connected to the stirring shaft. The pressure regulating plate is interference-fitted with the inner wall of the tank body. The stirring shaft is provided with a reversing thread that matches the pressure regulating plate. By rotating the stirring shaft, the pressure regulating plate moves back and forth along the stirring shaft to adjust the internal pressure of the tank body.

2. The apparatus for non-cyanide leaching gold extraction from gold concentrate according to claim 1, characterized in that, The reversing thread includes a first thread groove and a second thread groove that are staggered and spirally distributed. Both ends of the first thread groove and the second thread groove are connected. The pressure regulating plate is fixedly provided with a plug that is inserted into the first thread groove or the second thread groove on the side near the stirring shaft.

3. The apparatus for non-cyanide leaching gold extraction from gold concentrate according to claim 1, characterized in that, A telescopic limiting rod is also fixedly installed at the upper end of the pressure regulating plate. The end of the telescopic limiting rod away from the pressure regulating plate passes through the end cover and is fixedly connected to it.

4. The apparatus for non-cyanide leaching gold extraction from gold concentrate according to claim 1, characterized in that, The tank is also equipped with a refrigeration module for cooling its interior and a heating module for heating its interior.

5. A method for non-cyanide leaching gold from gold concentrate, using the apparatus for non-cyanide leaching gold from gold concentrate as described in any one of claims 1-4, characterized in that, The steps are as follows: S1: Ball milling the gold concentrate; S2: Add the ball-milled gold concentrate from S1 into the tank, and at the same time add the leachate into the tank; S3: The stirring shaft is controlled to rotate by the drive motor. The stirring shaft drives the material to rotate. At the same time, the pressure regulating plate moves back and forth along the reversing thread on the stirring shaft to continuously regulate the pressure inside the tank. S4: During the leaching process, the heating module heats the tank to the preset temperature, then the heating module is turned off and the cooling module is turned on to cool the tank to the preset temperature. The heating module is then turned on again for heating and the cooling module is turned on for cooling. S5: Separate the treated leachate and leachate residue.

6. The method for non-cyanide leaching gold extraction from gold concentrate according to claim 5, characterized in that, The mass-to-volume ratio of the gold concentrate to the leachate is 1g:2-4mL.

7. The method for non-cyanide leaching gold extraction from gold concentrate according to claim 6, characterized in that, The leachate contains the following raw materials in parts by weight: 10-20 parts lime sulfur mixture, 1-5 parts sodium sulfate, 1-5 parts sodium hexametaphosphate, 1-3 parts chitosan surfactant, 1-3 parts sodium dodecylbenzene sulfonate, and 100 parts water.

8. The method for non-cyanide leaching gold extraction from gold concentrate according to claim 7, characterized in that, The chitosan surfactant is prepared by grafting carboxyl chitosan with 3-chloro-2-hydroxypropyl dehydroabietic ammonium chloride.

9. The method for non-cyanide leaching gold extraction from gold concentrate according to claim 5, characterized in that, The maximum pressure inside the tank after adjustment by the pressure regulating plate in S3 is 0.4-0.6 MPa.

10. The method for non-cyanide leaching gold extraction from gold concentrate according to claim 5, characterized in that, The final heating temperature in S4 is 60-80℃, the final cooling temperature is 5-15℃, the cooling and heating rates are both 1-3℃ / min, and the leaching time is 3-5h.

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