A washing and drying device for the production of ultra-high purity gold

Abstract

The present invention relates to a washing and drying device for the production of ultra-high purity gold, comprising: a washing and drying tank; a stirring mechanism including a stirring rod rotatably installed, the stirring rod being of a tubular structure and fixedly installed with stirring blades; a separating and guiding hopper fixedly installed on the washing and drying tank, the distance between the hopper opening of the separating and guiding hopper and the outer side wall of the stirring rod being set; a liquid material circulation mechanism including a uniform dispersion ring pipe coaxially sleeved on the top of the stirring rod, the uniform dispersion ring pipe being connected to a reflux pipe and uniformly provided with spray heads connected below it; a material reflux mechanism including a driving rod coaxially sleeved inside the stirring rod, and a spiral upwardly arranged auger blade installed on the driving rod; a dispersion and drying mechanism including a dispersion plate fixedly connected to the stirring rod, and a guide pipe arranged on the stirring rod. The present invention effectively improves the impurity removal rate of the gold purity and uses low-grade alloyed gold raw materials to produce 6N ultra-high purity gold.

Description

Technical Field

[0001] The present invention relates to the technical field of gold production and purification, and particularly to a washing and drying device for the production of ultra-high purity gold, especially for the production of 6N ultra-high purity gold from low-grade alloyed gold. Background Art

[0002] The purity of gold determines its performance and application scenarios. Generally, high-purity gold is used in fields such as finance, industry, medicine, aerospace, scientific research, and jewelry. Due to its extremely high purity and excellent unique properties, 6N high-purity gold is widely used in microelectronic components, gold-plated layers of satellite components, and quantum computing. Therefore, in the preparation process, to improve the purity of gold, impurities in gold must be removed.

[0003] In the prior art, the purification methods of gold mainly include aqua regia method, electrolysis method, pyrometallurgy method, solvent extraction method, ion exchange method, and microbial method. These methods have their own advantages and all remove impurities through corresponding means to improve the impurity removal rate. However, there is an important defect in the existing methods. The purity of gold prepared by purifying with gold raw materials with lower requirements can only reach below 4N, while the gold raw materials used for preparing 5N or above, especially 6N, have relatively high requirements.

[0004] Therefore, the research purpose of the present invention is to design a washing and drying device that can further wash and dry with a detergent to effectively improve the impurity removal rate, thereby improving the purity of gold, and effectively overcome the disadvantages of poor raw material adaptability in traditional high-purity gold production methods, difficult separation of impurity silver in gold, inability to use low-grade raw materials to produce high-purity gold, and the product not reaching the high-purity level, and can use low-grade alloyed gold raw materials to produce 6N ultra-high purity gold. Summary of the Invention

[0005] In view of the above technical problems existing in the prior art, the present invention provides a washing and drying device for the production of ultra-high purity gold, which can effectively solve the above technical problems existing in the prior art.

[0006] The technical solution of the present invention is as follows:

[0007] A washing and drying device for the production of ultra-high purity gold, comprising:

[0008] A washing and drying tank, on which a corresponding cover is fixedly installed at the upper part. The cover is respectively provided with a feed pipe and a liquid inlet pipe. A corresponding discharge pipe is provided at the bottom of the washing and drying tank, and a corresponding liquid discharge pipe and a hot gas inlet pipe are respectively provided at the bottom side. Both the liquid discharge pipe and the hot gas inlet pipe are arranged above the sediment.

[0009] A stirring mechanism, comprising a stirring rod which is driven by a corresponding first driving motor to rotate and is mounted on the lower side of the cover, wherein the stirring rod is a tubular structure and is fixedly mounted with a corresponding stirring blade;

[0010] A partitioning guide hopper is fixedly mounted on the inner wall of the washing and drying tank below the stirring blade at the bottom, the partitioning guide hopper is coaxially arranged with the stirring rod, and a spacing is set between the hopper opening and the outer wall of the stirring rod;

[0011] A liquid circulation mechanism, wherein the liquid outlet pipe is provided with a corresponding liquid discharge pipe and a return pipe in parallel through a corresponding liquid pump, and the liquid circulation mechanism comprises a uniform dispersion ring pipe coaxially sleeved on the top of the stirring rod, the uniform dispersion ring pipe is connected to the return pipe and the nozzles under the open slots are evenly connected and provided below the uniform dispersion ring pipe;

[0012] The material reflux mechanism comprises a driving rod coaxially sleeved in the stirring rod, and a second driving motor fixedly connected to the top of the cover and rotating in a direction opposite to that of the first driving motor, wherein the driving rod is driven by the second driving motor, and an auger blade arranged in a spiral upward shape is installed on the driving rod;

[0013] The dispersion and drying mechanism comprises a dispersion plate fixedly connected to the top of the stirring rod and arranged below the uniform dispersion ring tube, the dispersion plate is evenly distributed with a plurality of material penetration holes penetrating from top to bottom thereof, and the stirring rod is evenly and obliquely provided with corresponding material guide pipes at the upper end of the dispersion plate; when the second driving motor is started, the driving rod and the auger blades are driven to rotate to transfer the gold mud deposited at the bottom of the washing and drying tank upward and flow to the dispersion plate along the material guide pipe, and when the second driving motor rotates in the reverse direction, the stirring rod and the dispersion plate are driven to rotate, and the material is evenly dispersed and conducted downward under the action of centrifugal force.

[0014] The outer side of the washing and drying tank is installed with a corresponding heat exchange jacket in an interlayer state. The upper and lower sides of the heat exchange jacket are respectively provided with corresponding medium inlet pipes and medium outlet pipes, and the medium inlet pipe is connected to the external heat exchange liquid source through a corresponding liquid pump; the washing and drying tank is supported and installed by corresponding supporting legs, and a corresponding closing cover is installed on the feed pipe in an openable and closable manner. Corresponding valves are fixedly installed on the liquid inlet pipe, the discharge pipe, the hot air inlet pipe, the liquid return pipe and the discharge pipe, and the liquid outlet pipe and the hot air inlet pipe are both arranged below the partition guide hopper.

[0015] A corresponding mounting tube or mounting ring plate is fixed downwardly on the bottom side of the cover at a position corresponding to the stirring rod, and the stirring rod is rotatably sleeved on the mounting tube or mounting ring plate through a corresponding bearing; the stirring rod is connected to the output shaft end of the first driving motor through a gear meshing transmission method or a belt transmission method.

[0016] An ultra-high purity gold production process based on the above-mentioned washing and drying equipment includes the following specific steps:

[0017] S1. Raw gold analysis: Sampling and analyzing the raw gold for gold, silver, moisture and impurity elements;

[0018] S2. Vacuum gasification separation: Under high vacuum conditions, physically separate gold and silver in one step;

[0019] S3. Gold separation by aqua regia: Prepare aqua regia using concentrated nitric acid and concentrated hydrochloric acid. Aqua regia can dissolve gold. During the dissolution reaction, gold is dissolved, and at the same time, impurity silver reacts with chloride ions to form silver chloride precipitate, achieving a deep chemical separation of gold and silver again;

[0020] S4. Filtration and sedimentation of gold-containing precious liquid: The gold-containing precious liquid is first filtered and purified by the method of "titanium sintered filter element" and "pressure filtration", and then enters the natural sedimentation tank for static sedimentation;

[0021] S5. Extraction: Use a composite extractant to extract the gold-containing precious liquid. During the extraction process, gold and the extractant exist in the form of complex ions and dissolve in the organic phase to form a loaded organic phase;

[0022] S6. Back extraction: Adopt the reduction back extraction method, use a reducing agent to reduce the gold ions in the loaded organic phase to gold atoms, and control the reaction temperature and time to produce ultra-high purity gold mud;

[0023] S7. Washing and drying: Use a combination detergent and the above-mentioned washing and drying equipment to wash the gold mud to remove impurity content, and the gold mud reaches ultra-high purity after drying.

[0024] The raw gold used in step S1 is low-grade alloy gold, which is alloy gold containing 60 - 99% gold, 5 - 50% silver, and 0.1 - 10% copper.

[0025] The vacuum degree of the vacuum gasification separation in step S2 is 1 - 100 Pa, the gasification temperature range is 1400 - 1600 °C, the heat preservation time is 3 - 10 h, and the silver vapor condensation temperature range is 100 °C - 300 °C.

[0026] The aqua regia for gold separation in step S3 is prepared using concentrated nitric acid with a concentration of 95 - 98% and concentrated hydrochloric acid with a concentration of 33 - 36%, and the ratio of concentrated nitric acid to concentrated hydrochloric acid is 1:3. The dissolution reaction time of aqua regia for gold separation is 2 - 4 h, the reaction temperature is 50 - 100 °C, and the cooling temperature after the reaction is 10 - 30 °C.

[0027] The filtration device used for filtration and sedimentation of the gold-containing precious liquid in step S4 is a closed container with a titanium material shell, and multiple titanium sintered filter elements are installed inside the container. The filtration pressure is 0.5 - 1.0 MPa; after filtration, it is left to stand in the natural sedimentation tank, and the sedimentation time is 8 - 16 h.

[0028] The extraction in step S5 uses a composite extractant for liquid-liquid extraction of gold-containing precious liquid. The extraction system mainly consists of multi-stage extraction, multi-stage washing, and stripping processes. The extraction speed is controlled by frequency conversion, the extraction frequency is 15 - 40 Hz, the volume ratio O / A is 1:1.5 - 3.0, the number of extraction stages is 3 - 8, the number of washing stages is 3 - 5, and the washing section is washed with a detergent, and the added concentration of the detergent is 0.3 - 0.65 mol / L.

[0029] The reduction and stripping temperature in step S6 is 50 - 90 °C, and the reduction and stripping time is 1.5 - 3 h; the washing and drying in step S7 use a combined detergent to wash the gold mud, where the washing temperature is 80 - 100 °C and the drying temperature is 200 - 450 °C.

[0030] Advantages of the present invention:

[0031] 1) Based on separate stirring, washing, and drying, the present invention combines them into a washing and drying integrated device, thereby achieving the dual effects of washing and drying. The washing and drying tank is divided into two communicable upper and lower parts by a partition guiding hopper. During the process of stirring and washing with the combined detergent, the detergent and sediment will flow through the gradually narrowing partition guiding hopper to the lower part of the washing and drying tank for effective separation; then, the liquid material circulation mechanism pumps the detergent flowing to the lower part of the washing and drying tank back to its upper part to continue reacting with the material; and it is dispersed into the material in a centrifugal state through a dispersion disk rotating with the stirring rod to ensure full contact and reaction between the detergent and the material, further improving the utilization rate of the detergent, and thus increasing the washing and impurity removal rate.

[0032] 2) When the sediment flows through the gradually narrowing partition guiding hopper to the lower part of the washing and drying tank, it may be mixed with some gold mud that has not been fully washed. Therefore, the present invention coaxially sets a reversely rotating driving rod inside the tubular stirring rod, and installs a spiral upward auger blade on the driving rod, thereby re-transporting the material and sediment flowing through the guiding filter to the lower part of the washing and drying tank and guiding them through a guiding pipe to the dispersion disk, and dispersing and mixing them in a centrifugal state again with the refluxing detergent to further improve the washing and impurity removal efficiency.

[0033] 3) After traditional washing, it is necessary to transfer the material to a corresponding filtering container for filtration and then dry it through a drying device. In this way, the material will stick in the device, resulting in a reduction in the finished product recovery rate. Therefore, after the washing is completed in the present invention, the precipitate and the washing liquid are directly guided through a separating and guiding hopper with a gradually narrowing opening to the lower part of the washing and drying tank, and a relatively independent space is formed in the washing and drying tank, which will not be overly affected by the stirring process in the upper part, and there is no need to wait for the stirring process to be completely completed before proceeding to the next solid-liquid separation step. This effectively improves the processing efficiency of washing and drying, and thus effectively realizes rapid solid-liquid stratification. The separated upper-layer liquid is pumped away by a liquid material pump, and the lower-layer precipitate is conveyed upward by the auger blades of the material reflux mechanism and centrifugally dispersed by a rotating dispersion disk. Hot air is transmitted through a hot air inlet pipe, and then upwardly open dispersion is formed through the separating and guiding hopper, fully contacting the dispersed precipitate for drying, ensuring an improvement in the drying efficiency.

[0034] 4) On the basis of ensuring the washing and impurity removal rate of the gold mud and improving the efficiency, the present invention can further remove silver through vacuum gasification separation. Utilizing the difference in the saturated vapor pressures of various elements in the alloyed gold, the silver saturated vapor is relatively large and volatilizes in a gaseous state to be enriched at the top layer of the vacuum gasification separation device. After collection, it enters the silver purification and recovery process. Gold, due to its smaller saturated vapor than silver, is enriched in a solid state at the bottom layer of the vacuum gasification separation device and enters the ultra-high purity gold production process. The high-temperature melting physical method is adopted to achieve the physical separation of gold and silver at one time under high vacuum conditions, avoiding the formation of a large amount of silver slag during the subsequent aqua regia gold separation process to wrap the gold, reducing the direct recovery rate of gold; dissolving gold through aqua regia gold separation, during the dissolution reaction process, gold is dissolved, and at the same time, the impurity silver reacts with chloride ions to form silver chloride precipitate, realizing the deep chemical separation of gold and silver again; achieving the sedimentation of gold-containing precious liquid through "titanium sintered filter element" pressure filtration and natural sedimentation method; then, the liquid-liquid extraction extraction system mainly consists of multiple-stage extraction, multiple-stage washing, and stripping processes. During the extraction process, gold and the extractant exist in the form of complex ions and dissolve in the organic phase to form a loaded organic phase; and the reduction stripping method is adopted, using a reducing agent to reduce the gold ions in the loaded organic phase to gold atoms, controlling the reaction temperature and time to produce ultra-high purity gold mud; finally, the gold mud is cleaned with a combined detergent, and after drying, it reaches ultra-high purity gold mud, further meeting the requirement of removing the impurity content of the ultra-high purity gold mud, with the gold content in the gold mud reaching more than 99.9999%, and the direct recovery rate of 6N ultra-high purity gold being 99%. The present invention can effectively overcome the disadvantages of the traditional high-purity gold production method, such as poor adaptability of raw materials, difficulty in separating impurity silver in gold, inability to use low-grade raw materials to produce high-purity gold, and the product not being able to reach the high-purity level, and uses low-grade alloyed gold raw materials to produce 6N ultra-high purity gold. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of the present invention.

[0036] Figure 2 isFigure 1 Schematic sectional view.

[0037] Figure 3 Installation schematic diagram of the uniform dispersion ring pipe and the dispersion plate.

[0038] Figure 4 Process flow chart of the present invention.

[0039] In the drawings: washing and drying tank 1, feed pipe 101, liquid inlet pipe 102, discharge pipe 103, liquid outlet pipe 104, hot gas inlet pipe 105, heat exchange jacket 106, cover 2, stirring mechanism 3, first driving motor 301, stirring rod 302, stirring blade 303, material guiding pipe 304, partitioned material guiding hopper 4, liquid material circulation mechanism 5, liquid material pump 501, uniform dispersion ring pipe 502, nozzle 503, material reflux mechanism 6, driving rod 601, second driving motor 602, auger blade 603, dispersion and drying mechanism 7, dispersion plate 701. Detailed implementation manners

[0040] For the convenience of those skilled in the art to understand, the embodiments will be further described in detail with reference to the drawings for the structure of the present invention:

[0041] Embodiment 1:

[0042] Refer to Figures 1-3 , a washing and drying device for ultra-high purity gold production, comprising:

[0043] Washing and drying tank 1, with a corresponding cover 2 fixedly installed on its upper part, the cover 2 is respectively provided with a feed pipe 101 and a liquid inlet pipe 102, the bottom of the washing and drying tank 1 is provided with a corresponding discharge pipe 103, and its bottom side is respectively provided with a corresponding liquid outlet pipe 104 and a hot gas inlet pipe 105, and both the liquid outlet pipe 104 and the hot gas inlet pipe 105 are arranged above the sediment;

[0044] Stirring mechanism 3, including a stirring rod 302 rotatably installed under the cover 2 driven by a corresponding first driving motor 301, the stirring rod 302 is in a tubular structure and fixedly installed with corresponding stirring blades 303;

[0045] Partitioned material guiding hopper 4, fixedly installed on the inner wall of the washing and drying tank 1 below the lowermost stirring blade 303, the partitioned material guiding hopper 4 is coaxially arranged with the stirring rod 302, and the distance between its hopper mouth and the outer wall of the stirring rod 302 is set;

[0046] Liquid material circulation mechanism 5. The liquid outlet pipe 104 is provided with a corresponding drain pipe and a reflux pipe in parallel through a corresponding liquid material pump 501. The liquid material circulation mechanism 5 includes a uniform dispersion ring pipe 502 coaxially sleeved on the top of the stirring rod 302. The uniform dispersion ring pipe 502 communicates with the reflux pipe and is uniformly connected with spray heads 503 under the open slots below it.

[0047] Material reflux mechanism 6, including a driving rod 601 coaxially sleeved in the stirring rod 302 and a second driving motor 602 fixedly connected to the top of the cover 2 and rotating in the opposite direction to the first driving motor 301. The driving rod 601 is driven by the second driving motor 602, and a spiral upward auger blade 603 is installed on the driving rod 601.

[0048] Dispersion and drying mechanism 7, including a dispersion plate 701 fixedly connected to the top of the stirring rod 302 and arranged below the uniform dispersion ring pipe 502. A plurality of material-penetrating holes penetrating through the upper and lower parts are uniformly distributed on the dispersion plate 701. Corresponding guide pipes 304 are inclined and uniformly arranged on the stirring rod 302 above the dispersion plate 701. When the second driving motor 602 is started, the driving rod 601 and the auger blade 603 are driven to rotate to convey the gold mud deposited at the bottom of the washing and drying tank 1 upward and flow onto the dispersion plate 701 along the guide pipes 304. When the first driving motor 301 rotates reversely, the stirring rod 302 and the dispersion plate 701 are driven to rotate, and the material is uniformly dispersed under the action of centrifugal force and conducted downward.

[0049] Based on separate stirring, washing and drying, the present invention combines them into a washing and drying integrated device, and thus can achieve the dual effects of washing and drying. The washing and drying tank 1 is separated into two communicable upper and lower parts by the partition guide hopper 4. During the process of stirring and washing with the mixed detergent, the detergent and the precipitate will flow to the lower part of the washing and drying tank 1 along the gradually narrowing partition guide hopper 4 for effective separation. Then, the liquid material circulation mechanism 5 pumps the detergent flowing to the lower part of the washing and drying tank 1 back to its upper part to continue to react with the material. And it is dispersed into the material in a centrifugal state by the dispersion plate rotating with the stirring rod 302 to ensure full contact and reaction between the detergent and the material, further improving the utilization rate of the detergent and thus increasing the washing and impurity removal rate.

[0050] While the sediment is being guided from the gradually narrowing partition guide hopper 4 to the lower part of the washing and drying tank 1, some gold mud that has not been fully washed may be mixed. Therefore, the present invention coaxially arranges a counter-rotating drive rod 601 in the tubular structure of the stirring rod 302, and installs a spiral upward auger blade 603 on the drive rod 601, so that the material and sediment guided and filtered to the lower part of the washing and drying tank 1 are re-transmitted and guided to the dispersion disk through the guide pipe 304, and are dispersed and mixed again in a centrifugal manner with the refluxed detergent to further improve the washing and impurity removal efficiency.

[0051] After traditional washing, the material needs to be transferred to the corresponding filter container for filtration and then dried by the drying equipment. This will cause the material to stick in the equipment, resulting in a reduction in the finished product recovery rate. Therefore, after the washing is completed, the precipitate and the washing liquid are directly guided to the lower part of the washing and drying tank 1 through the gradually narrowed separation guide hopper 4, and a relatively independent space is formed in the washing and drying tank 1, which will not be affected too much by the stirring process of the upper part, and there is no need to wait for the stirring process to be completely completed before continuing the next step of solid-liquid separation, which effectively improves the processing efficiency of washing and drying, and then effectively realizes rapid solid-liquid stratification. The separated upper layer liquid is extracted by a liquid material pump, and the lower layer precipitate is transmitted upward by the auger blade 603 of the material reflux mechanism 6 and centrifugally dispersed by the rotating dispersion disk, and hot gas is transmitted through the hot gas inlet pipe 105, and then the separation guide hopper 4 is formed to be open upward for dispersion, fully contacting with the dispersed precipitate for drying, ensuring the improvement of drying efficiency.

[0052] The outer side of the washing and drying tank 1 is installed with a corresponding heat exchange jacket 106 in an interlayer state. The upper and lower sides of the heat exchange jacket 106 are respectively provided with corresponding medium inlet pipes and medium outlet pipes, and the medium inlet pipe is connected to the external heat exchange liquid source through a corresponding liquid pump; the washing and drying tank 1 is supported and installed by corresponding supporting legs, and the corresponding closing cover can be opened and closed on the feed pipe 101, and corresponding valves are fixedly installed on the liquid inlet pipe 102, the discharge pipe 103, the hot air inlet pipe 105, the return liquid pipe and the discharge pipe, and the liquid outlet pipe 104 and the hot air inlet pipe 105 are both arranged below the partition guide hopper 4.

[0053] A corresponding mounting tube or mounting ring plate is fixed downwardly on the bottom side of the cover 2 at a position corresponding to the stirring rod 302, and the stirring rod 302 is rotatably sleeved on the mounting tube or mounting ring plate through a corresponding bearing; the stirring rod 302 is connected to the output shaft end of the first driving motor 301 through a gear meshing transmission method or a belt transmission method.

[0054] Embodiment 2:

[0055] refer to Figure 4, A super-high purity gold production process based on the above-mentioned washing and drying equipment, including the following specific steps:

[0056] S1, Raw gold analysis: Sampling and analyzing the raw gold for gold, silver, moisture and impurity elements;

[0057] S2, Vacuum gasification separation: Under high vacuum conditions, physically separate gold and silver in one step;

[0058] S3, Gold parting with aqua regia: Prepare aqua regia by mixing concentrated nitric acid and concentrated hydrochloric acid. Aqua regia can dissolve gold. During the dissolution reaction, gold is dissolved, and at the same time, impurity silver reacts with chloride ions to form silver chloride precipitate, achieving a deep chemical separation of gold and silver again;

[0059] S4, Filtration and sedimentation of gold-containing precious liquid: The gold-containing precious liquid is first filtered and purified by the methods of "titanium sintered filter element" and "pressure filtration", and then enters the natural sedimentation tank for static sedimentation;

[0060] S5, Extraction: Use a composite extractant to extract the gold-containing precious liquid. During the extraction process, gold and the extractant exist in the form of complex ions and dissolve in the organic phase to form a loaded organic phase;

[0061] S6, Back extraction: Adopt the reduction back extraction method, use a reducing agent to reduce the gold ions in the loaded organic phase to gold atoms, and control the reaction temperature and time to produce super-high purity gold mud;

[0062] S7, Washing and drying: Use a combined detergent and the above-mentioned washing and drying equipment to clean the gold mud to remove the impurity content, and the gold mud reaches super-high purity after drying.

[0063] The raw gold used in step S1 is low-grade alloy gold, which is alloy gold containing 60 - 99% gold, 5 - 50% silver, and 0.1 - 10% copper.

[0064] The vacuum degree of the vacuum gasification separation in step S2 is 1 - 100 Pa, the gasification temperature range is 1400 - 1600 °C, the heat preservation time is 3 - 10 h, and the silver vapor condensation temperature range is 100 °C - 300 °C.

[0065] The gold parting with aqua regia in step S3 is prepared by using concentrated nitric acid with a concentration of 95 - 98% and concentrated hydrochloric acid with a concentration of 33 - 36%, and the ratio of concentrated nitric acid to concentrated hydrochloric acid is 1:3. The dissolution reaction time of gold parting with aqua regia is 2 - 4 h, the reaction temperature is 50 - 100 °C, and the cooling temperature after the reaction is 10 - 30 °C.

[0066] The filtration device used for the filtration and sedimentation of the gold-containing precious liquid in step S4 is a closed container with a titanium material shell, and multiple titanium sintered filter elements are installed in the container. The filtration pressure is 0.5 - 1.0 MPa; after filtration, it is left to stand in the natural sedimentation tank, and the sedimentation time is 8 - 16 h.

[0067] The extraction in step S5 uses a composite extractant for liquid-liquid extraction of gold-containing precious liquid. The extraction system mainly consists of multi-stage extraction, multi-stage washing, and stripping processes. The extraction speed is controlled by frequency conversion, with the extraction frequency number being 15 - 40 Hz, the volume ratio O / A being 1:1.5 - 3.0, the number of extraction stages being 3 - 8, the number of washing stages being 3 - 5, and the washing stage uses a detergent for washing, with the added concentration of the detergent being 0.3 - 0.65 mol / L.

[0068] The reduction and stripping temperature in step S6 is 50 - 90 °C, and the reduction and stripping time is 1.5 - 3 h; the washing and drying in step S7 use a combined detergent to wash the gold mud, where the washing temperature is 80 - 100 °C and the drying temperature is 200 - 450 °C.

[0069] On the basis of ensuring the washing and impurity removal rate of the gold mud and improving the efficiency, the present invention can further remove silver by vacuum gasification separation. Utilizing the difference in saturated vapor pressures of various elements in the crude gold, the silver saturated vapor is relatively large and volatilizes in a gaseous state and accumulates at the top layer of the vacuum gasification separation equipment. After collection, it enters the silver purification and recovery process. Gold, due to its smaller saturated vapor than silver, accumulates in a solid state at the bottom layer of the vacuum gasification separation equipment and enters the ultra-high purity gold production process. By using the high-temperature melting physical method, the physical separation of gold and silver is achieved once under high vacuum conditions, avoiding the formation of more silver slag during the subsequent aqua regia gold separation process to wrap the gold, reducing the direct recovery rate of gold; dissolving gold by aqua regia, during the dissolution reaction process, gold is dissolved, and at the same time, the impurity silver reacts with chloride ions to form silver chloride precipitation, realizing the deep chemical separation of gold and silver again; achieving the sedimentation of gold-containing precious liquid through "titanium sintered filter element" pressure filtration and natural sedimentation method; then, the liquid-liquid extraction system mainly consists of multi-stage extraction, multi-stage washing, and stripping processes. During the extraction process, gold exists in the form of complex ions with the extractant and dissolves in the organic phase to form a loaded organic phase; and the reduction and stripping method is adopted, using a reducing agent to reduce the gold ions in the loaded organic phase to gold atoms, controlling the reaction temperature and time to produce ultra-high purity gold mud; finally, using a combined detergent to wash the gold mud, and after drying the gold mud, it reaches ultra-high purity gold mud, further meeting the requirement of removing the impurity content of the ultra-high purity gold mud, with the gold content in the gold mud reaching more than 99.9999%, and the direct recovery rate of 6N ultra-high purity gold being 99%. The present invention can effectively overcome the disadvantages of the traditional high-purity gold production methods, such as poor adaptability of raw materials, difficulty in separating impurity silver in gold, inability to use low-grade raw materials to produce high-purity gold, and the product not being able to reach the high-purity level, and uses low-grade crude gold raw materials to produce 6N ultra-high purity gold.

[0070] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A washing and drying equipment for ultra-high purity gold production, characterized in that: include: A washing and drying tank (1) is fixedly mounted with a corresponding sealing cover (2) on its upper part, a material feed pipe (101) and a liquid inlet pipe (102) are respectively arranged on the sealing cover (2), a corresponding material discharge pipe (103) is arranged at the bottom of the washing and drying tank (1), and corresponding liquid discharge pipes (104) and hot air inlet pipes (105) are respectively arranged on the sides of the bottom, and the liquid discharge pipes (104) and hot air inlet pipes (105) are both arranged above the sediment; A stirring mechanism (3), comprising a stirring rod (302) which is driven by a corresponding first driving motor (301) to rotate and is mounted on the lower side of the cover (2); the stirring rod (302) is a tubular structure and is fixedly mounted with a corresponding stirring blade (303); A partitioning guide hopper (4) is fixedly mounted on the inner wall of the washing and drying tank (1) below the stirring blade (303) at the bottom, the partitioning guide hopper (4) being coaxially arranged with the stirring rod (302), and a hopper opening thereof is spaced apart from the outer wall of the stirring rod (302); A liquid material circulation mechanism (5), wherein the liquid outlet pipe (104) is provided with a corresponding liquid discharge pipe and a return pipe in parallel via a corresponding liquid pump (501), and the liquid material circulation mechanism (5) comprises a uniform dispersion ring pipe (502) coaxially sleeved on the top of the stirring rod (302), the uniform dispersion ring pipe (502) being connected to the return pipe and having nozzles (503) uniformly connected below the open slots; The material reflux mechanism (6) comprises a driving rod (601) coaxially sleeved in the stirring rod (302), and a second driving motor (602) fixedly connected to the top of the cover (2) and having a rotation direction opposite to that of the first driving motor (301), wherein the driving rod (601) is driven by the second driving motor (602), and an auger blade (603) arranged in a spiral upward direction is installed on the driving rod (601); The dispersion and drying mechanism (7) comprises a dispersion plate (701) fixedly connected to the top of the stirring rod (302) and arranged below the uniform dispersion ring tube (502); the dispersion plate (701) is uniformly provided with a plurality of material penetration holes penetrating the top and the bottom thereof; and corresponding material guide pipes (304) are uniformly arranged obliquely on the upper end of the dispersion plate (701) on the stirring rod (302); when the second driving motor (602) is started, the driving rod (601) and the auger blade (603) are driven to rotate, so that the gold mud deposited at the bottom of the washing and drying tank (1) is transferred upward and flows to the dispersion plate (701) along the material guide pipe (304); and when the first driving motor (301) rotates in the reverse direction, the stirring rod (302) and the dispersion plate (701) are driven to rotate, so that the material is uniformly dispersed and transferred downward under the action of centrifugal force.

2. The washing and drying equipment for ultra-high purity gold production according to claim 1, characterized in that: The outer side of the washing and drying tank (1) is provided with a corresponding heat exchange jacket (106) in an interlayer state, and the upper and lower sides of the heat exchange jacket (106) are provided with corresponding medium inlet pipes and medium outlet pipes, respectively, and the medium inlet pipe is connected to an external heat exchange liquid source through a corresponding liquid pump; the washing and drying tank (1) is supported and installed by corresponding supporting legs, and a corresponding closing cover is installed on the feed pipe (101) in an openable and closable manner; corresponding valves are fixedly installed on the liquid inlet pipe (102), the discharge pipe (103), the hot air inlet pipe (105), the liquid return pipe and the liquid discharge pipe; and the liquid outlet pipe (104) and the hot air inlet pipe (105) are both arranged below the partition guide hopper (4).

3. The washing and drying equipment for ultra-high purity gold production according to claim 1, characterized in that: A corresponding mounting tube or mounting ring plate is fixedly connected downwardly to the bottom side of the cover (2) at a position corresponding to the stirring rod (302); the stirring rod (302) is rotatably sleeved onto the mounting tube or mounting ring plate via a corresponding bearing; the stirring rod (302) is transmission-connected to the output shaft end of the first drive motor (301) via a gear meshing transmission method or a belt transmission method.

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