Gold refining equipment and method

Abstract

The present invention relates to a gold refining device, comprising a first tank body and a second tank body, wherein at least one pair of first diaphragms are arranged in the first tank body, a first anode plate and a first cathode plate are arranged on both sides of the first diaphragm, and two first anode plates are arranged between the pair of the first diaphragms; at least one pair of second diaphragms are arranged in the second tank body, a second anode plate and a second cathode plate are arranged on both sides of the second diaphragm, and two second cathode plates are arranged between the pair of the second diaphragms; a first anode region is between the pair of the first diaphragms; a second cathode region is between the pair of the second diaphragms; the first anode region and the second cathode region are connected; and further relates to a refining method using the above refining device, wherein the crude gold plate is firstly dissolved in the first tank body, and then the precious metal solution is sequentially introduced into the precious gold solution tank and the second tank body, a mixed solution of hydrochloric acid and urea is added into the second tank body, and the power supply of the second tank body is turned on to precipitate gold; the gold backlog is small and the cost investment is low.

Description

Technical Field

[0001] The present invention relates to a precious metal refining device and method, and in particular to a gold refining device and method. Background Art

[0002] The purpose of gold refining is to remove impurities, improve the purity of gold, and obtain gold products that meet various requirements; currently the production of national standard 2# gold, 1# gold and high-purity gold mainly relies on chemical dissolution reduction and electrolysis.

[0003] The chemical dissolution reduction method requires less investment and has low requirements for raw material purity, but both the aqua regia dissolution reduction method and the chlorination dissolution reduction method will emit a large amount of waste gas, causing serious pollution.

[0004] The electrolysis method is to cast the crude gold containing more than 92% gold into the anode, use the stainless steel plate or titanium plate as the cathode, and use the chloroauric acid aqueous solution and free hydrochloric acid as the electrolyte. Direct current is used for electrolysis, and the gold dissolves from the anode to form Au3+ ions, which move to the cathode for discharge and precipitation and deposit on the cathode. When a certain degree is reached, the cathode is removed and purified to process the ingot, and its gold purity is above 99.99%;

[0005] The traditional electrolysis method requires the preparation of gold electrolyte before electrolysis, that is, a portion of pure gold is dissolved in aqua regia or sodium chlorate solution, and then diluted with hydrochloric acid to prepare the required electrolyte. This process not only releases a large amount of waste gas, but also this portion of pure gold will be occupied all the time, resulting in high initial investment costs; and as impurities accumulate in the electrolyte, it will affect the quality of the cathode gold, and the electrolyte must be regenerated before it can be used again.

[0006] This solution does not require the preparation of electrolyte. The crude gold anode plate is directly hung on the anode rod of the first tank. The solution in the first tank is a hydrochloric acid solution. When the electricity is turned on, it is dissolved in the presence of a diaphragm. The presence of the diaphragm will hinder the passage of Au[I II] in the solution, so Au[III] will accumulate in the anode area of ​​the first tank. When the crude gold anode plate is completely dissolved, the gold-containing precious liquid in the anode area of ​​the first tank is transferred to the cathode area of ​​the second tank through a high-level tank. After the electricity is turned on, the gold is precipitated on the cathode plate of the second tank. There is also a diaphragm between the anode and cathode areas of the second tank, which prevents Au[III] from passing through and intercepts Au[III] in the cathode area so that it can be precipitated on the cathode plate as much as possible.

[0007] As for the accumulation of impurities in the solution, when the impurities accumulate to a certain extent, new solution will be replaced to avoid the precipitation of unqualified gold powder components. Summary of the invention

[0008] The present invention aims at solving the above-mentioned deficiencies in the prior art and provides a gold refining device with low pollution and low cost.

[0009] The technical solution of the present invention to solve the above technical problems is as follows: a gold refining device, comprising a first tank body and a second tank body, wherein a first conductive copper bar and a first diaphragm are arranged in the first tank body, a first anode plate and a first cathode plate are arranged on both sides of the first diaphragm, the first diaphragm comprises at least one pair, and two first anode plates are arranged between the pair of the first diaphragms;

[0010] A second conductive copper bar and a second diaphragm are provided in the second tank body, a second anode plate and a second cathode plate are provided on both sides of the second diaphragm respectively, the second diaphragm includes at least one pair, and two second cathode plates are provided between the pair of second diaphragms;

[0011] The first diaphragm can divide the first tank body into a plurality of regions, the region between a pair of the first diaphragms is a first anode region, and the region between the tank wall of the first tank body and the first diaphragm is a first cathode region;

[0012] The second diaphragm can divide the second tank body into a plurality of regions, the region between a pair of the second diaphragms is a second cathode region, and the region between the tank wall of the second tank body and the second diaphragm is a second anode region;

[0013] When the first diaphragms include two or more pairs, a first cathode plate is provided between two adjacent pairs of the first diaphragms, and the area between two adjacent pairs of the first diaphragms is a first cathode area;

[0014] When the second diaphragms include two or more pairs, a second anode plate is provided between two adjacent pairs of the second diaphragms, and the area between two adjacent pairs of the second diaphragms is a second anode region.

[0015] Furthermore, it also includes a noble metal solution tank, the first anode area and the second cathode area are connected through the noble metal solution tank, and the height of the noble metal solution tank is higher than the height of the first trough body and the second trough body.

[0016] Furthermore, it also includes a first type of solution tank, which can supply liquid to the first tank body, and the first solution tank is filled with hydrochloric acid.

[0017] Furthermore, it also includes a second type of solution tank, which can supply liquid to the second cathode area, and the second type of solution tank contains a mixed solution of hydrochloric acid and urea.

[0018] Furthermore, the first anode plate is a rough gold plate, the first cathode plate is a titanium plate, and the second anode plate and the second cathode plate are both titanium plates.

[0019] Furthermore, the first trough body and the second trough body are respectively provided with diaphragm fixing clamps, and the first diaphragm and the second diaphragm are respectively installed in the first trough body and the second trough body through the diaphragm fixing clamps.

[0020] Furthermore, it also includes a smoke baffle, which is arranged obliquely and is located above the first trough body and the second trough body.

[0021] Furthermore, it also includes a waste liquid tank, which is connected to the second cathode region.

[0022] Further, further, the first trough body and the second trough body are arranged in parallel, the first type of solution tank, the second type of solution tank, the precious metal solution tank and the waste liquid tank are arranged in parallel, and a partition is provided between the area where the first trough body and the second trough body are located and the area where the first type of solution tank, the second type of solution tank, the precious metal solution tank and the waste liquid tank are located, and an exhaust hole is provided on the partition, and the exhaust hole is located above the first trough body and the second trough body; a gas-liquid separator is connected to the exhaust hole through a pipeline.

[0023] Furthermore, an anode bag is sleeved on the outer periphery of the first anode plate.

[0024] Furthermore, it also includes a plurality of circulation pumps, which can respectively mix the solutions in the first tank body and the second tank body evenly.

[0025] The present invention also relates to a gold refining method, which is characterized in that the gold refining device is used for refining, and specifically comprises the following steps:

[0026] Step 1, add a first type of solution into the first tank, wherein the first type of solution is hydrochloric acid, and turn on the power supply of the first tank to energize the first type of solution; the first anode plate begins to dissolve, and the gold, silver, lead, zinc, copper, bismuth, etc. on the first anode plate form corresponding ions and enter the solution, wherein the silver ions combine with the chloride ions in the solution to generate silver chloride precipitates that fall into the anode bag, while Au[III], divalent lead ions, divalent zinc ions, divalent copper ions, divalent bismuth ions, etc., due to the presence of the first diaphragm, the first diaphragm can block Au[III] from passing through, but has no obstructive effect on other metal ions. Therefore, under the action of the first diaphragm and the current, the divalent lead ions, divalent zinc ions, divalent copper ions, divalent bismuth ions, etc., pass through the first diaphragm to the first cathode region, while Au[III] is enriched in the first anode region because it cannot pass through the first diaphragm; after the first anode plate is completely dissolved, turn off the power supply of the first tank, wherein Au[III] includes trivalent gold ions and gold ions in a complex state, such as [AuCl4] - ion;

[0027] Step 2, evacuate the precious metal solution tank, absorb the precious metal solution in the first anode area into the precious metal solution tank, then, using the height difference between the precious metal solution tank and the second tank body, transport the solution in the precious metal solution tank to the second cathode area, and add the second type of solution to the second anode area, wherein the second type of solution is a mixed solution of hydrochloric acid and urea; then, turn on the power of the second tank body to start gold precipitation; the presence of the second diaphragm can block Au[III] in the second cathode area, prevent it from moving to the second anode area and causing the Au[III] concentration in the solution of the second cathode area to decrease, resulting in less gold powder precipitated; when the Au[III] concentration in the solution in the second cathode area is reduced to 5g / L, turn off the power of the second tank body, take out the second cathode plate, and flush off the gold powder on the second cathode plate;

[0028] Step 3: evacuate the waste liquid tank, and pump the solution in the second cathode area into the waste liquid tank, collect and concentrate to reduce the residual gold therein.

[0029] The beneficial effects of the present invention are as follows: without the need to configure an electrolyte, the first anode plate is directly hung on the anode rod of the first tank body, the solution in the first tank body is a hydrochloric acid solution, and when power is applied, Au[III] in the solution is dissolved in the presence of a first diaphragm, and the presence of the first diaphragm will hinder the passage of Au[III] in the solution, so Au[III] will accumulate in the anode area of ​​the first tank body, and when the first gold anode plate is completely dissolved, the gold-containing precious metal solution in the first anode area is transferred to the second cathode area of ​​the second tank body through a precious metal solution tank, and gold is precipitated on the second cathode plate after power is applied. A second diaphragm is provided in the second tank body to prevent the passage of Au[III], and to retain Au[III] in the second cathode area so that it can be precipitated on the second cathode plate as much as possible; the problem of large gold backlog and high cost investment in the traditional gold electrolysis process is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the internal structure of the device in the present invention;

[0031] Figure 2 It is a front view of the device in the present invention;

[0032] Figure 3 It is a rear view of the device in the present invention;

[0033] Figure 4 It is the right view of the device in the present invention

[0034] Explanation of the numbers in the accompanying drawings: 1: circulating pump; 2: diaphragm fixing clamp; 3: first cathode area; 4: first anode area; 5: first tank body; 6: first cathode plate; 7: first diaphragm; 8: first anode plate; 9: suction hole; 10: liquid level sight glass; 11: second cathode area; 12: second tank body; 13: second cathode plate; 14: second anode plate; 15: second anode area; 16: second diaphragm; 17: first tank body main electrical control; 18: intelligent control system; 19: second conductive copper busbar; 20: first type solution tank; 21: second type solution tank; 22: precious metal solution tank; 23: waste liquid tank; 24: flue gas duct; 25: gas-liquid separator; 26: flue gas baffle; 27: movable door; 28: first conductive copper busbar. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] like Figure 1-Figure 4 As shown, a gold refining device comprises a first tank body 5 and a second tank body 12, wherein a first conductive copper bar 28 and a first diaphragm 7 are arranged in the first tank body 5, a first anode plate 8 and a first cathode plate 6 are arranged on both sides of the first diaphragm 7, the first diaphragm 7 comprises two pairs, two first anode plates 8 are arranged between a pair of the first diaphragms 7; a first cathode plate 6 is arranged between two adjacent pairs of the first diaphragms 7, and the area between the two adjacent pairs of the first diaphragms 7 is a first cathode area 3;

[0037] A second conductive copper bar 19 and a second diaphragm 16 are arranged in the second tank body 12, and a second anode plate 14 and a second cathode plate 13 are arranged on both sides of the second diaphragm 16, respectively. The second diaphragm 16 includes two pairs, and two second cathode plates 13 are arranged between a pair of the second diaphragms 16; a second anode plate 14 is arranged between two adjacent pairs of the second diaphragms 16, and the area between the two adjacent pairs of the second diaphragms 16 is a second anode area 15;

[0038] The first diaphragm 7 can divide the first tank body 5 into a plurality of regions, the region between a pair of the first diaphragms 7 is a first anode region 4, and the region between the tank wall of the first tank body 5 and the first diaphragm 7 is a first cathode region 3;

[0039] The second diaphragm 16 can divide the second tank body 12 into a plurality of regions. The region between a pair of the second diaphragms 16 is the second cathode region 11, and the region between the tank wall of the second tank body 12 and the second diaphragm 16 is the second anode region 15.

[0040] The first anode region 4 and the second cathode region 15 are connected via a noble metal solution tank 22 . The height of the noble metal solution tank 22 is higher than that of the first tank body 5 and the second tank body 12 .

[0041] It also includes a first type solution tank 20, which can supply liquid to the first tank body 5, and the first solution tank 20 is filled with hydrochloric acid.

[0042] The second type solution tank 21 is also included. The second type solution tank 21 can supply liquid to the second cathode area 11. The second type solution tank 21 contains a mixed liquid of hydrochloric acid and urea.

[0043] The first anode plate 8 is a rough gold plate, the first cathode plate 6 is a titanium plate, and the second anode plate 14 and the second cathode plate 13 are both titanium plates.

[0044] The first trough body 5 and the second trough body 12 are respectively provided with a diaphragm fixing clamp 2 , and the first diaphragm 7 and the second diaphragm 16 are respectively installed in the first trough body 5 and the second trough body 12 through the diaphragm fixing clamp 2 .

[0045] It also includes a gas-liquid separator 25, and the gas-liquid separator 25 is connected to the exhaust hole 9 through a pipeline. Because the operating temperature is relatively high (during normal operation, the solution temperature in the first tank body is 98°C, and the solution temperature in the second tank body is 68°C), the solution evaporates, and gold is dissolved in the solution. If this part of the gas is directly extracted by the fan, it will cause part of the raw material loss, resulting in a decrease in the raw material recovery rate. Therefore, a gas-liquid separator is designed at the exhaust port, and cooling circulating water is passed through the gas-liquid separator. After the flue gas enters the gas-liquid separator, it is cooled, and the water mist in the flue gas is liquefied and refluxed into the tank body, thereby avoiding the loss of gold and improving the raw material recovery rate.

[0046] It also includes a smoke baffle 26 , which is arranged at an angle and is located above the first tank body 5 and the second tank body 12 .

[0047] The system further comprises a waste liquid tank 23 , which is in communication with the second cathode region 11 .

[0048] It also includes the first tank body master electric control 17 and the second tank body master electric control, and an intelligent control system, which can directly supply power to the first conductive copper bus 28 and the second conductive copper bus 19 in the first tank body 5 and the second tank body 12. The first tank body 5 and the second tank body 12 are both provided with movable doors 27 in front for easy opening for maintenance.

[0049] The first tank body 5 and the second tank body 12 are arranged in parallel, the first type solution tank 20, the second type solution tank 21, the precious metal solution tank 22 and the waste liquid tank 23 are arranged in parallel, and a partition is provided between the area where the first tank body 5 and the second tank body 12 are located and the area where the first type solution tank 20, the second type solution tank 21, the precious metal solution tank 22 and the waste liquid tank 23 are located, and the partition is provided with an air extraction hole 9, and the air extraction hole 9 is located above the first tank body 5 and the second tank body 12;

[0050] The first solution tank 20 , the second solution tank 21 , the precious metal solution tank 22 and the waste liquid tank 23 are each provided with a liquid level sight glass 10 .

[0051] It also includes a plurality of circulation pumps 1, which can respectively mix the solutions in the first tank body 5 and the second tank body 12 evenly.

[0052] The present invention also relates to a gold refining method, which is characterized in that the gold refining device is used for refining, and specifically comprises the following steps:

[0053] Step 1, add a first type of solution into the first tank body 5, wherein the first type of solution is hydrochloric acid, and the power supply of the first tank body 5 is turned on to energize the first type of solution; the first anode plate 8 begins to dissolve, and the gold, silver, lead, zinc, copper, bismuth, etc. on the first anode plate 8 form corresponding ions and enter the solution, wherein the silver ions combine with the chloride ions in the solution to generate silver chloride precipitates that fall into the anode bag, while Au[III], divalent lead ions, divalent zinc ions, divalent copper ions, divalent bismuth ions, etc. are blocked from passing through by the first diaphragm 7, but have no blocking effect on other metal ions. Therefore, under the action of the first diaphragm 7 and the current, the divalent lead ions, divalent zinc ions, divalent copper ions, divalent bismuth ions, etc. pass through the first diaphragm to the first cathode region, while Au[III] is enriched in the first anode region 4 because it cannot pass through the first diaphragm 7; after the first anode plate 8 is completely dissolved, turn off the power supply of the first tank body 5;

[0054] Step 2, evacuate the precious metal solution tank 22, pump the precious metal solution in the first anode area 4 into the precious metal solution tank 22, then, by utilizing the height difference between the precious metal solution tank 22 and the second tank body 12, transport the solution in the precious metal solution tank 22 to the second cathode area 11, and add the second type of solution to the second anode area 15, wherein the second type of solution is a mixed solution of hydrochloric acid and urea; then, turn on the power of the second tank body 12 to start gold precipitation; the presence of the second diaphragm 16 can block Au[III] in the second cathode area 11, prevent it from moving to the second anode area 15 and causing the concentration of Au[III] in the solution of the second cathode area 11 to decrease, resulting in less precipitated gold powder; when the concentration of Au[III] in the solution in the second cathode area 11 decreases to 5 g / L, turn off the power of the second tank body, take out the second cathode plate, and flush off the gold powder on the second cathode plate;

[0055] Step 3: evacuate the waste liquid tank 23, and pump the solution in the second cathode region 11 into the waste liquid tank 23, collect and concentrate the residual gold therein to reduce it.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gold refining equipment, characterized in that: It comprises a first tank body and a second tank body, wherein a first conductive copper bar and a first diaphragm are arranged in the first tank body, a first anode plate and a first cathode plate are arranged on both sides of the first diaphragm, the first diaphragm comprises at least one pair, and two first anode plates are arranged between the pair of the first diaphragms; A second conductive copper bar and a second diaphragm are provided in the second tank body, a second anode plate and a second cathode plate are provided on both sides of the second diaphragm respectively, the second diaphragm includes at least one pair, and two second cathode plates are provided between the pair of second diaphragms; The first diaphragm can divide the first tank body into a plurality of regions, the region between a pair of the first diaphragms is a first anode region, and the region between the tank wall of the first tank body and the first diaphragm is a first cathode region; The second diaphragm can divide the second tank body into a plurality of regions, the region between a pair of the second diaphragms is a second cathode region, and the region between the tank wall of the second tank body and the second diaphragm is a second anode region; When the first diaphragms include two or more pairs, a first cathode plate is provided between two adjacent pairs of the first diaphragms, and the area between two adjacent pairs of the first diaphragms is a first cathode area; When the second diaphragms include two or more pairs, a second anode plate is provided between two adjacent pairs of the second diaphragms, and the area between the two adjacent pairs of the second diaphragms is the second anode area; The first anode plate is a rough gold plate, the first cathode plate is a titanium plate, and the second anode plate and the second cathode plate are both titanium plates; The first diaphragm blocks the passage of Au[III], but has no blocking effect on divalent lead ions, divalent zinc ions, divalent copper ions, and divalent bismuth ions. The second diaphragm blocks Au[III] in the second cathode region, and the Au[III] includes trivalent gold ions and complexed gold ions.

2. The gold refining equipment according to claim 1, characterized in that: It also includes a noble metal solution tank, through which the first anode region and the second cathode region are connected, and a height of the noble metal solution tank is higher than a height of the first trough body and the second trough body.

3. The gold refining equipment according to claim 2, characterized in that: It also includes a first type of solution tank, which can supply liquid to the first tank body.

4. The gold refining equipment according to claim 3, characterized in that: Also included is a second type of solution tank, which can supply solution to the second cathode region.

5. The gold refining equipment according to claim 1, characterized in that: The first trough body and the second trough body are respectively provided with diaphragm fixing clamps, and the first diaphragm and the second diaphragm are respectively installed in the first trough body and the second trough body through the diaphragm fixing clamps.

6. The gold refining equipment according to claim 1, characterized in that: It also includes a smoke baffle, which is inclined and located above the first trough body and the second trough body.

7. The gold refining equipment according to claim 4, characterized in that: The invention also comprises a waste liquid tank, which is communicated with the second cathode region.

8. The gold refining equipment according to claim 4, characterized in that: The first trough body and the second trough body are arranged in parallel, and the first type solution tank, the second type solution tank, the precious metal solution tank and the waste liquid tank are arranged in parallel. A partition is provided between the area where the first trough body and the second trough body are located and the area where the first type solution tank, the second type solution tank, the precious metal solution tank and the waste liquid tank are located, and an exhaust hole is provided on the partition, and the exhaust hole is located above the first trough body and the second trough body; a gas-liquid separator is connected to the exhaust hole through a pipeline.

9. A gold refining method, characterized in that: The gold refining equipment according to any one of claims 1 to 8 is used for refining, which specifically comprises the following steps: Step 1, add a first type of solution into the first tank, wherein the first type of solution is hydrochloric acid, and turn on the power supply of the first tank, power the first type of solution, and the first anode plate begins to dissolve. After the first anode plate is completely dissolved, turn off the power supply of the first tank; Step 2, transporting the precious metal solution to the precious metal solution tank, and transporting the solution in the precious metal solution tank to the second cathode area, adding the second type of solution to the second anode area, wherein the second type of solution is a mixed solution of hydrochloric acid and urea; then turning on the power of the second tank body to start gold precipitation; when the Au[III] concentration in the solution in the second cathode area is reduced to 5 g / L, turning off the power of the second tank body, taking out the second cathode plate, and flushing off the gold powder on the second cathode plate; Step 3: transport the solution in the second cathode area to a waste liquid tank, collect and concentrate the residual gold therein to reduce it.

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