CN116083959A - Regeneration preparation method of gold liquid to be recovered prepared from beta-gold potassium citrate and gold potassium cyanide - Google Patents
Regeneration preparation method of gold liquid to be recovered prepared from beta-gold potassium citrate and gold potassium cyanide Download PDFInfo
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- CN116083959A CN116083959A CN202310033088.6A CN202310033088A CN116083959A CN 116083959 A CN116083959 A CN 116083959A CN 202310033088 A CN202310033088 A CN 202310033088A CN 116083959 A CN116083959 A CN 116083959A
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- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/20—Electrolytic production, recovery or refining of metals by electrolysis of solutions of noble metals
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Abstract
The invention discloses a regeneration preparation method of gold liquid to be recovered prepared from beta-potassium gold citrate and potassium aurous cyanide, which aims at regeneration of gold-containing solution, aging solution, gold electroplating and gold electroforming electroplating solution produced by manufacturing to achieve the aim of clean production. Then through electrolytic recovery and adsorption of active carbon or resin and without zinc reduction process, the gold content of the effluent can reach 0.8 parts per million (namely 0.8 PPM) of loss clean production. The regeneration preparation method of the gold-containing recovery liquid and the aging liquid can recover gold with the proportion up to 99.2 percent, and the regenerated product can reach 95 percent.
Description
Technical Field
The invention relates to a regeneration preparation method of gold liquid to be recovered, in particular to a regeneration preparation method of gold-containing recovery liquid and aging liquid for regeneration of gold treatment solution to be recovered, which is prepared from beta-potassium gold citrate and potassium aurous cyanide.
Background
The gold-containing to-be-recovered treatment liquid produced in the process of producing beta-gold potassium citrate or gold potassium cyanide accounts for about 18% of volume liquid, the aging liquid produced in the process of producing gold potassium cyanide accounts for about 25-30%, the current treatment method comprises the steps of electrolytic recovery, zinc reduction and active carbon adsorption or resin adsorption, but the gold loss and recovery cost of the method are both about 15% of the recovered gold value.
Therefore, how to solve the above-mentioned problems and disadvantages of the prior art is a subject to be developed by related industries.
Disclosure of Invention
The invention aims to provide a regeneration preparation method of gold liquid to be recovered, which is prepared from beta-gold potassium citrate and gold potassium cyanide, in particular to gold electroplating, and comprises the following steps:
s101: preparing a gold treatment solution to be recovered prepared from beta-potassium gold citrate and potassium aurous cyanide;
s102: adding recycled material;
s103: heating and concentrating to volume location and refrigerating until the temperature reaches the standard;
s104: vacuum filtering;
s105: generating an initial extract and an initial crystalline precipitate;
s106: performing three purification processes on the initial crystal precipitate to generate a target crystal precipitate;
s107: drying the target crystal precipitate;
s108: detecting whether the gold content accords with the range of 68.1-68.5% by controlling the quality of the target crystal sediment with the national standard deviation of 3 thousandths;
s109: if the judgment in the step S108 is qualified, finishing the regenerated product; and
s110: if the judgment in the step S108 is not qualified, the target crystal precipitate is subjected to a purification process again, and then the step S108 is returned to continue to judge whether the target crystal precipitate is qualified;
wherein the extract produced during the purification process is recycled to the crystalline precipitate or the initial extract of the intermediate process.
In one embodiment of the present invention, the purification process comprises the steps of:
s201: adding pure water at a constant temperature at a specific temperature to dissolve completely;
s202: refrigerating until the temperature reaches the standard; s203: vacuum filtration is carried out.
In one embodiment of the invention, the recycled material is an acidic organic material, and is a buffered complexing substance that undergoes complexing and neutralization during the process to adjust the pH.
In one embodiment of the present invention, after adding the regenerated material to the initial extract in step S105, a purification process is performed to generate a target extract, wherein the crystallization precipitate generated in the process is recycled to the initial crystallization precipitate; the target extract is placed in a multi-effect electrolytic tank for electrolysis to recover gold, the circulating pump flow rate of the multi-effect electrolytic tank is 8-10 times of the volume of an electrolytic chamber, a downstream flow mode is used, the space between the electrolytic chamber and the chamber is 30-36 cm, the distance between the anode and the cathode is 3-6 cm, and the current density is 2-3 (ampere/square decimeter).
In one embodiment of the invention, the multi-effect electrolytic cell consists of 6 cathode plates and 7 anode plates, and when the gold content of the electrolyte reaches below 0.9PPM, free cyanide in the solution can be decomposed.
The invention provides a regeneration preparation method of potassium aurous cyanide aging liquid, in particular to gold electroforming, which comprises the following steps:
s301: preparing an aging solution of potassium aurous cyanide;
s302: adding recycled material;
s303: heating and concentrating to volume location and refrigerating until the temperature reaches the standard;
s304: vacuum filtering;
s305: generating an initial extract and an initial crystalline precipitate;
s306: performing two purification processes on the initial crystal precipitate to generate a target crystal precipitate;
s307: drying the target crystal precipitate;
s308: detecting whether the gold content accords with the range of 68.1-68.5% by controlling the quality of the target crystal sediment with the national standard deviation of 3 thousandths;
s309: if the judgment in the step S308 is qualified, finishing the regenerated product;
s310: if the judgment in the step S308 is not qualified, the target crystal precipitate is subjected to a purification process again, and then the step S108 is returned to continue to judge whether the target crystal precipitate is qualified;
s311: adding regenerative substances to the initial extract, and then performing a purification process to generate a target extract and a crystallization precipitate which is generated along with the target extract;
s312: heating and concentrating to volume location and refrigerating until the temperature reaches the standard;
s313: vacuum filtering;
s314: generating a draw-off solution to be electrolyzed and a crystallization precipitate which is generated along with the draw-off solution;
s315: the extraction liquid to be electrolyzed is electrolyzed in a multi-effect electrolyzer to recover gold, wherein the extraction liquid generated in the process of the purification process is recycled and combined to the crystallization precipitate or the initial extraction liquid of the intermediate process.
In one embodiment of the present invention, the accompanying crystallization precipitate is subjected to a purification process to produce a new draw solution and a new crystallization precipitate, and the new draw solution is combined in a target draw solution and the new crystallization precipitate is combined in an initial crystallization precipitate.
In one embodiment of the invention, the recycled material is an acidic organic material, and is a buffered complexing substance that undergoes complexing and neutralization during the process to adjust the pH.
In one embodiment of the invention, the circulating pump flow rate of the multi-effect electrolytic tank is 8-10 times of the volume of the electrolytic chamber, and a downstream flow mode is used, wherein the space between the electrolytic chamber and the chamber is 30-36 cm, the distance between the anode and the cathode is 3-6 cm, and the current density is 2-3 (ampere/square decimeter).
In one embodiment of the invention, the multi-effect electrolytic cell consists of 6 cathode plates and 7 anode plates, and when the gold content of the electrolyte reaches below 0.9PPM, free cyanide in the solution can be decomposed.
In summary, the regeneration preparation method of the gold liquid to be recovered prepared from beta-gold potassium citrate and gold potassium cyanide disclosed by the invention can achieve the following effects:
1. the regeneration of the aging solution, the gold electroplating and the gold electroforming electroplating solution is clean aiming at the gold-containing solution produced by manufacturing;
2. the gold content of the effluent can reach 0.8 parts per million (namely 0.8 PPM) of loss clean production;
3. the regeneration preparation method of the gold-containing recovery liquid and the aging liquid can recover gold with the proportion up to 99.2, and the regenerated product can reach 95%; and
4. saving gold resources, and no secondary pollution after waste liquid treatment is generated in gold recovery.
The objects, technical contents, features and effects achieved by the present invention will be more readily understood by the following detailed description of the embodiments.
Drawings
FIG. 1 is a schematic diagram of a regeneration chemical process of gold solution to be recovered prepared from beta-potassium gold citrate and potassium aurous cyanide according to the present invention;
FIG. 2 is a flow chart of a regeneration preparation method of gold liquid to be recovered prepared by beta-potassium gold citrate and potassium aurous cyanide according to the invention;
FIG. 3 is a flow chart of a method according to the present invention for the purification process of FIG. 2;
FIG. 4 is a schematic chemical flow chart of a regeneration preparation method of the potassium aurous cyanide ageing liquid;
FIG. 5 is a flow chart of a method for regenerating and preparing the potassium aurous cyanide ageing liquor of the invention;
FIG. 6 is a flow chart of a method according to the present invention for the purification process of FIG. 5.
Symbol description:
100: regeneration preparation method of gold liquid to be recovered prepared from beta-gold potassium citrate and gold potassium cyanide
300: regeneration preparation method of potassium aurous cyanide aging liquid
200. 400: purification process method
S101, S102, S103, S104, S105, S106, S107, S108, S109, S110: step (a)
S201, S202, S203: step (a)
S301, S302, S303, S304, S305, S306, S307, S308, S309, S310, S311, S312, S313, S314, S315: step (a)
S401, S402, S403: step (a)
Detailed Description
In order to solve the problem of poor effect of the existing recovery of gold, recovery of beta-gold potassium citrate and crystallization of gold potassium cyanide, the inventor has studied and developed for many years to improve the defects of the existing products, and then, will describe in detail how to achieve the most efficient functional requirements by a regeneration preparation method of gold liquid to be recovered prepared from beta-gold potassium citrate and gold potassium cyanide.
The invention aims at the regeneration of gold-containing solution, aging solution, gold electroplating and gold electroforming electroplating solution produced by manufacturing to achieve the aim of clean production, and then the clean production is carried out by electrolytic recovery and adsorption of active carbon or resin without zinc reduction process, wherein the gold content of the effluent can reach 0.8 parts per million (namely 0.8 PPM). Next, the relevant matters of the embodiments of the present invention will be described in further detail.
[ regeneration preparation method of gold solution to be recovered prepared from beta-gold potassium citrate and gold potassium cyanide ]
Referring to fig. 1 to 3, fig. 1 is a schematic diagram of a regeneration chemical process of gold solution to be recovered prepared from beta-potassium gold citrate and potassium aurous cyanide according to the present invention. FIG. 2 is a flow chart of a regeneration preparation method of gold liquid to be recovered prepared from beta-potassium gold citrate and potassium aurous cyanide. FIG. 3 is a flow chart of a method according to the present invention for the purification process of FIG. 2. As shown in the figure, the regeneration preparation method 100 of the gold liquid to be recovered prepared from beta-gold potassium citrate and potassium aurous cyanide, particularly gold electroplating, the regeneration preparation method 100 of the gold liquid to be recovered prepared from beta-gold potassium citrate and potassium aurous cyanide comprises the following steps: in step S101: firstly, preparing a solution to be recovered gold treatment prepared by beta-potassium gold citrate and potassium aurous cyanide, and then entering step S102: adding regenerative material into the solution prepared from beta-gold potassium citrate and gold potassium cyanide and used for gold treatment to be recovered, wherein the regenerative material is an acidic organic substance and is a buffering complexing article, and the regenerative material can perform complexing reaction and neutralization reaction in the process so as to adjust the pH value. Next, the process advances to step S103: heating and concentrating to volume positioning and refrigerating until the temperature reaches the standard, and then entering step S104: vacuum filtration is performed to separate liquid and solid.
After the above-mentioned vacuum filtration step is completed, the process proceeds to step S105: an initial withdrawal and an initial crystalline precipitate are produced. Next, the process advances to step S106: the initial crystalline precipitate is subjected to three purification processes to produce a target crystalline precipitate, and the extract produced during the purification process is recycled and combined to the intermediate crystalline precipitate or the initial extract. Herein, referring to fig. 3, the purification process 200 includes the following steps: step S201: adding pure water at a constant temperature at a specific temperature to dissolve completely; step S202: refrigerating until the temperature reaches the standard; step S203: vacuum filtration is carried out. Next, the process proceeds to step S107 after the target crystal precipitate is produced: drying the target crystal precipitate at 101-120 deg.c. Next, the process advances to step S108: and detecting whether the gold content of the target crystal precipitate accords with the range of 68.1-68.5% by controlling the quality of the target crystal precipitate with the national standard deviation of 3 thousandths. If the determination result in step S108 is yes (pass), the process proceeds to step S109: and (3) finishing a regenerated product, wherein the regenerated product is slightly toxic gold potassium cyanide. If the determination result in step S108 is no (failed), the process proceeds to step S110: and then carrying out a purification process on the target crystal precipitate again, and replaying the extraction liquid generated in the purification process into the crystal precipitate or the initial extraction liquid in the middle process. It should be noted that after the completion of step S110, the process returns to step S108 to continue to determine whether the test result is acceptable.
In addition, after the regeneration material is added to the initial extract in the step S105, a purification process (e.g., steps S201 to S203) is performed once to generate the target extract, wherein the crystallization precipitate generated in the process is recycled to the initial crystallization precipitate. Next, the target draw solution is placed in a multi-effect electrolyzer for electrolysis to recover gold. In the embodiment of the invention, the flow rate of the circulating pump of the multi-effect electrolytic tank is 8-10 times of the volume of the electrolytic chamber, the space between the electrolytic chamber and the chamber is 30-36 cm by using a downstream flow mode, the distance between the anode and the cathode is 3-6 cm, and the current density is 2-3 amperes/square decimeter. The multi-effect electrolytic tank consists of 6 cathode plates and 7 anode plates, and when the gold content of the electrolyte reaches below 0.9PPM, free cyanide in the solution can be decomposed. It is worth mentioning that the regenerated material is organic hydrocarbon, and when gold is recovered by electrolysis, oxygen is produced by the anode to remove the gold. In the embodiment of the invention, the regeneration preparation method of the gold liquid to be recovered prepared from beta-potassium gold citrate and potassium aurous cyanide can recover gold with the proportion up to 99.2%, and the regenerated product can reach 95%. Saving gold resources, and no secondary pollution after waste liquid treatment is generated in gold recovery.
[ regeneration preparation method of potassium aurous cyanide aging solution ]
Referring to fig. 4 to 6, fig. 4 is a chemical flow chart of a method for preparing the potassium aurous cyanide aging solution according to the present invention. FIG. 5 is a flow chart of a method for regenerating and preparing the potassium aurous cyanide ageing liquid. FIG. 6 is a flow chart of a method according to the present invention for the purification process of FIG. 5. As shown in the figure, the regeneration preparation method 300 of the potassium aurous cyanide aging solution, particularly for gold electroforming, comprises the following steps: step S301: preparing an aging liquid of potassium aurous cyanide, and then proceeding to step S302: the regenerated matter is one kind of acid organic matter and is one kind of buffering complex matter, and the regenerated matter may be used in complexing reaction and neutralization reaction to regulate pH value. Next, the process advances to step S303: heating and concentrating to volume positioning and refrigerating until the temperature reaches the standard, and then entering step S304: vacuum filtration is carried out to separate liquid and solid.
After the above-mentioned vacuum filtration step is completed, the process proceeds to step S305: an initial extraction liquid and an initial crystalline precipitate are generated, and the process proceeds to step S306: the initial crystal precipitate is subjected to two purification processes to produce a target crystal precipitate, and the extract produced during the purification process is recycled and combined to the intermediate crystal precipitate or the initial extract. Herein, referring to fig. 6, the purification process 400 includes the following steps: step S401: adding pure water at a constant temperature at a specific temperature to dissolve completely; step S402: refrigerating until the temperature reaches the standard; step S403: vacuum filtration is carried out. Next, the process advances to step S307: drying the target crystal precipitate at 101-120 deg.c. Next, the flow advances to step S308: and detecting whether the gold content of the target crystal precipitate accords with the range of 68.1-68.5% by controlling the quality of the target crystal precipitate with the national standard deviation of 3 thousandths. If the determination result of step S308 is yes (pass), the flow proceeds to step S309: and (3) finishing a regenerated product which is or slightly toxic gold potassium cyanide. If the determination result in step S308 is no (failed), the flow proceeds to step S310: and (3) carrying out a purification process on the target crystal precipitate again, and replaying the extraction liquid generated in the purification process to be combined with the crystal precipitate in the middle process or the initial extraction liquid. It should be noted that after the completion of step S310, the process returns to step S308 to continue to determine whether the test result is acceptable.
After step S305, the process also proceeds to step S311: after adding the recycled material to the initial extract, a purification process is performed once to produce a target extract and a crystal precipitate accompanying the production, wherein the extract produced during the purification process is recycled to be combined with the crystal precipitate of the intermediate process or the initial extract. Next, the process advances to step S312: heating and concentrating to volume positioning and refrigerating until the temperature reaches the standard, and then entering step S313: vacuum filtration is performed to separate liquid and solid. After that, the process advances to step S314: generating a draw-out solution to be electrolyzed and a crystal precipitate accompanying the generation, and proceeding to step S315: the extraction liquid to be electrolyzed is electrolyzed in a multi-effect electrolytic tank to recover gold, the flow rate of a circulating pump of the multi-effect electrolytic tank is 8-10 times of the volume of an electrolytic chamber, a downstream flow mode is used, the space between the electrolytic chamber and the chamber is 30-36 cm, the distance between a cathode and an anode is 3-6 cm, and the current density is 2-3 amperes/square decimeter. The multi-effect electrolytic tank consists of 6 cathode plates and 7 anode plates, and when the gold content of the electrolyte reaches below 0.9PPM, free cyanide in the solution can be decomposed. In addition, the recycled material is an organic hydrocarbon, and when gold is recovered by electrolysis, oxygen is generated by the anode to remove the gold.
It should be noted that in the above process, the crystallization precipitate accompanying the generation is subjected to a purification process to generate a new extract and a new crystallization precipitate, and the new extract is recycled and combined to the target extract, and the new crystallization precipitate is recycled and combined to the initial crystallization precipitate. In another embodiment of the present invention, the method 300 for regenerating potassium aurous cyanide aging solution can recover gold in a proportion of up to 99.2%, and the regenerated product can reach 95%. Saving gold resources, and no secondary pollution after waste liquid treatment is generated in gold recovery.
The invention uses physical principles of supersaturated solution, saturated solution, recrystallization and purification to achieve the aim of purifying the regenerated product beta-gold potassium citrate or gold potassium cyanide up to the standard. When the solubility of the neutralization and complexing substances of the regenerated substances in the solution is higher than that of the neutralization and binding substances of the regenerated substances in the solution when the cooling temperature reaches the standard (the neutralization substances and the complexing substances are soluble substances), vacuum filtration is carried out, the water for suction filtration exists between the complexing substances and the neutralization substances, and the crystallization filtration is completely separated when the beta-gold potassium citrate or the gold potassium cyanide is formed.
It should be noted that the regenerated material is an organic acid, and the regenerated material generates neutral complex material after the complex and neutralization reaction, and the complex material and the gold salt crystals are separated by the characteristic that the saturation solubility of the complex material and the gold salt crystals are greatly different from each other, wherein the pH value of the extracted liquid and the crystal precipitate is 8-12.
In summary, the regeneration preparation method of the gold liquid to be recovered prepared from beta-gold potassium citrate and gold potassium cyanide disclosed by the invention can achieve the following effects:
1. the regeneration of the aging solution, the gold electroplating and the gold electroforming electroplating solution is clean aiming at the gold-containing solution produced by manufacturing;
2. the gold content of the effluent can reach 0.8 parts per million (namely 0.8 PPM) of loss clean production;
3. the regeneration preparation method of the gold-containing recovery liquid and the aging liquid can recover gold with the proportion up to 99.2 percent, and the regenerated product can reach 95 percent; and
4. saving gold resources, and no secondary pollution after waste liquid treatment is generated in gold recovery.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the scope of the invention. Therefore, all equivalent changes or modifications with the characteristics and spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The regeneration preparation method of the gold liquid to be recovered prepared from beta-gold potassium citrate and gold potassium cyanide is characterized by comprising the following steps:
s101: preparing a gold treatment solution to be recovered prepared from beta-potassium gold citrate and potassium aurous cyanide;
s102: adding recycled material;
s103: heating and concentrating to volume location and refrigerating until the temperature reaches the standard;
s104: vacuum filtering;
s105: generating an initial extract and an initial crystalline precipitate;
s106: performing three purification processes on the initial crystal precipitate to generate a target crystal precipitate;
s107: drying the target crystal precipitate;
s108: detecting whether the gold content accords with the range of 68.1-68.5% by controlling the quality of the target crystal sediment with the national standard deviation of 3 thousandths;
s109: if the judgment in the step S108 is qualified, finishing the regenerated product; and
s110: if the judgment in the step S108 is not qualified, the target crystal precipitate is subjected to a purification process again, and then the step S108 is returned to continue to judge whether the target crystal precipitate is qualified;
wherein the extract produced during the purification process is recycled to the crystalline precipitate or the initial extract of the intermediate process.
2. The method for regenerating gold liquid to be recovered from beta-potassium gold citrate and potassium aurous cyanide as claimed in claim 1, wherein the purification process comprises the steps of:
s201: adding pure water at a constant temperature at a specific temperature to dissolve completely;
s202: refrigerating until the temperature reaches the standard; and
s203: vacuum filtration is carried out.
3. The method for preparing gold liquid to be recovered from beta-potassium gold citrate and potassium aurous cyanide according to claim 1, wherein the regenerated material is an acidic organic substance and is a buffer complex, and the complex and neutralization reactions are performed during the process to adjust the pH.
4. The method for regenerating gold solution to be recovered from beta-gold potassium citrate and gold potassium cyanide according to claim 1, wherein the initial extract in step S105 is added with regenerative substances, and then a purification process is performed to produce a target extract, wherein the crystal precipitate produced in the process is recycled to the initial crystal precipitate; the target extract is placed in a multi-effect electrolytic tank to carry out electrolysis so as to recover gold, wherein the flow rate of a circulating pump of the multi-effect electrolytic tank is 8-10 times the volume of an electrolytic chamber, and a downstream flow-through mode is used, the electrolytic chamber is separated from the chamber by 30-36 cm, the distance between a cathode and an anode is 3-6 cm, and the current density is 2-3 (ampere/square decimeter).
5. The method for regenerating gold solution to be recovered from gold potassium beta-citrate and gold potassium cyanide according to claim 4, wherein the multi-effect electrolytic tank comprises 6 cathode plates and 7 anode plates, and free cyanide in the solution is decomposed when the gold content of the electrolytic solution is below 0.9 PPM.
6. The regeneration preparation method of the potassium aurous cyanide aging liquid is characterized by comprising the following steps of:
s301: preparing an aging solution of potassium aurous cyanide;
s302: adding recycled material;
s303: heating and concentrating to volume location and refrigerating until the temperature reaches the standard;
s304: vacuum filtering;
s305: generating an initial extract and an initial crystalline precipitate;
s306: performing two purification processes on the initial crystal precipitate to generate a target crystal precipitate;
s307: drying the target crystal precipitate;
s308: detecting whether the gold content accords with the range of 68.1-68.5% by controlling the quality of the target crystal sediment with the national standard deviation of 3 thousandths;
s309: if the judgment in the step S308 is qualified, finishing the regenerated product;
s310: if the judgment in the step S308 is not qualified, the target crystal precipitate is subjected to a purification process again, and then the step S108 is returned to continue to judge whether the target crystal precipitate is qualified;
s311: adding regenerative substances to the initial extract, and then performing a purification process to generate a target extract and a crystallization precipitate which is generated along with the target extract;
s312: heating and concentrating to volume location and refrigerating until the temperature reaches the standard;
s313: vacuum filtering;
s314: generating a draw-off solution to be electrolyzed and a crystallization precipitate which is generated along with the draw-off solution; and
s315: electrolyzing the extract to be electrolyzed in a multi-effect electrolyzer to recover gold,
wherein the extract produced during the purification process is recycled to the crystalline precipitate or the initial extract of the intermediate process.
7. The method for preparing a potassium aurous cyanide aging solution according to claim 6, wherein the accompanying crystal precipitate is subjected to a purification process once to produce a new extract and a new crystal precipitate, and the new extract is recycled and combined with the target extract, and the new crystal precipitate is recycled and combined with the initial crystal precipitate.
8. The method for preparing a potassium aurous cyanide aging solution according to claim 6, wherein the regenerated substance is an acidic organic substance and is a buffer complex, and the complex and the neutralization are performed during the process to adjust the pH.
9. The method for preparing the potassium aurous cyanide aging solution according to claim 6, wherein the circulating pump flow rate of the multi-effect electrolytic cell is 8-10 times the volume of the electrolytic chamber, and a downstream flow-through mode is used, wherein the space between the electrolytic chamber and the chamber is 30-36 cm, the distance between the anode and the cathode is 3-6 cm, and the current density is 2-3 (ampere/square decimeter).
10. The method for preparing the potassium aurous cyanide aging solution according to claim 6, wherein the multi-effect electrolytic tank consists of 6 cathode plates and 7 anode plates, and free cyanide in the solution is decomposed when the gold content of the electrolytic solution is less than 0.9 PPM.
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