Dressing and smelting combined treatment process for high-arsenic high-sulfur heavy placer gold concentrate

Abstract

The invention relates to the technical field of beneficiation and smelting, and provides a high-arsenic high-sulfur heavy placer gold concentrate beneficiation and smelting combined treatment process which comprises the following steps: step 1, treating high-arsenic high-sulfur gold ore heavy sand; secondly, the ore sand is subjected to one-rough-one-fine gravity separation through shaking table equipment, the rough separation inclination angle ranges from 4.2 degrees to 4.8 degrees, and the fine separation inclination angle ranges from 3.5 degrees to 4.0 degrees; 3, the tailings are finely ground until-45 microns account for 90%-95%, and then biological oxidation treatment is conducted; and 4, obtaining high-grade gold-loaded carbon by adopting an oxidizing slag cyaniding carbon leaching process. According to the method, natural gold is fully recycled in an ore grinding and shaking table reselection mode, the high-grade gold concentrate containing 35% of gold is obtained, smelting, pre-selection and recycling can be directly carried out, the technology recycling process is shortened, and the recycling production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing and smelting, and in particular to a combined processing process for the processing of high-arsenic and high-sulfur heavy placer gold concentrate. Background Art

[0002] High-arsenic, high-sulfur heavy placer ore is a tailings product produced during the gold beneficiation process, resulting from centrifugal separation under coarse grinding conditions. It has a gold content of approximately 600g / t, an arsenic content of approximately 15%, and a sulfur content of approximately 30%, making it a difficult-to-process ore. This high-arsenic, high-sulfur heavy placer ore is characterized by the coexistence of some gold minerals with arsenic-sulfur minerals. Gold is often distributed within the arsenopyrite as fine-grained inclusions, or the two minerals coexist.

[0003] The main disadvantages of existing technology in processing this material are:

[0004] 1. Extremely low direct leaching rate: Since sulfides (such as pyrite) and arsenides (mainly arsenopyrite) tightly wrap a considerable portion of gold particles, the effective contact between the leaching agent (such as cyanide) and gold is hindered. As a result, when conventional single smelting methods (such as direct cyanide leaching) are used, the gold leaching recovery rate is very low, making it difficult to obtain satisfactory technical indicators.

[0005] 2. High processing cost: Given the extremely high gold grade of the material, if conventional smelting methods (such as roasting and oxidation followed by cyanidation or direct pressure oxidation) are forcibly adopted, in order to destroy the sulfides and arsenides that encapsulate the gold, extremely high reagent consumption (such as oxidants, acids, etc.) and harsh process conditions (such as high temperature and high pressure) are often required. This directly leads to significantly high smelting operation costs, seriously affecting the economic benefits of this high-value material.

[0006] 3. Low resource utilization: Due to low recovery rate and high cost, existing technologies are difficult to effectively process such high-arsenic and high-sulfur heavy placer gold concentrates, resulting in the high-grade gold resources contained therein being unable to be fully recovered and utilized; in view of this, the present invention proposes a high-arsenic and high-sulfur heavy placer gold concentrate beneficiation and smelting combined processing process. Summary of the Invention

[0007] The present invention proposes a combined beneficiation and smelting process for high-arsenic and high-sulfur heavy placer gold concentrate, which solves the problem of low gold leaching recovery rate.

[0008] The technical solution of the present invention is as follows: a combined beneficiation and smelting process for high-arsenic, high-sulfur heavy placer gold concentrate, comprising the following steps:

[0009] Step 1: Processing of heavy sand from high-arsenic and high-sulfur gold mines. The specific implementation process is as follows:

[0010] A1. Use a crusher to crush the raw ore (particle size ≤ 300mm) to ≤ 25mm to avoid overloading the scrubber;

[0011] A2. Roll grinding the ore particles with a high-pressure roller mill with a roller gap of 8-10 mm and a linear speed of 1.8 m / s to dissociate the gold and arsenic-sulfur minerals at the interface;

[0012] A3. Use a double-slot scrubbing grinder to scrub and grind the ore to -74μm, with a scrubbing time of 18-22 minutes;

[0013] Step 2: Use shaking table equipment to conduct coarse and fine gravity separation of ore sand, with the roughing inclination angle of 4.2-4.8° and the fine separation inclination angle of 3.5-4.0°;

[0014] Step 3: Grind the tailings to -45μm, accounting for 90-95%, and then carry out biological oxidation treatment. The biological oxidation parameters are controlled as follows: slurry concentration 8-12%, dissolved oxygen 3.0-4.0mg / L, pH 1.2-1.8, and time 8-10 days;

[0015] Step 4: Using the oxidation slag cyanide carbon leaching process, the specific implementation process is as follows:

[0016] B1. Mixing the finely ground slag with circulating water to prepare a slurry with a concentration of 40%-50%;

[0017] B2. Add Ca(OH)2 (1.5 kg / t) to the slurry, stir for 30 min, then add NaOH solution to adjust the pH to 10.5;

[0018] B3. Adding a sodium cyanide (NaCN) solution having a concentration of 0.02% to 0.1% to the conditioned slurry, and pumping the cyanide-containing slurry into the first carbon leaching tank;

[0019] B4. Add granular activated carbon (GAC) to the carbon leaching tank. The slurry is continuously stirred in a reactor equipped with an impeller or air agitation device and flows forward step by step. Under strong mechanical or air agitation, sodium cyanide reacts with gold to form a stable gold-cyanide complex [Au(CN)2]-. The activated carbon is suspended in the slurry and continuously absorbs the dissolved gold-cyanide complex. Because the activated carbon is more easily absorbed than gold particles, the newly dissolved gold is quickly captured by the carbon, keeping the dissolved gold concentration in the slurry at a very low level.

[0020] B5. The tailings slurry is kept in a large thickener for a long time and aerated. The treated tailings slurry enters the thickener for concentration. The supernatant is recycled for grinding or partially discharged. The concentrated underflow enters the tailings pond for safe storage or backfill. The concentrated supernatant may be returned to the process for reuse, thereby reducing water consumption and the amount of cyanide added.

[0021] B6. The gold-loaded carbon taken out from the carbon leaching tank needs to be washed to remove the attached ore mud and debris, and then classified by the vibrating screen. The qualified gold-loaded carbon is sent to the desorption gold extraction system.

[0022] Preferably, the shaking table equipment includes several support columns, the tops of several support columns are fixedly connected to the same support base, one end of the support base is provided with an installation box, the installation box is provided with a driving mechanism, the top of the support base is provided with a roughing mechanism for cooperating with the activation of the driving mechanism to roughly select the ore sand, and the bottom of the roughing mechanism is provided with a concentrating mechanism for concentrating the ore sand by cooperating with the activation of the driving mechanism.

[0023] Preferably, the roughing mechanism includes a movable seat slidably connected to the top of the support seat, the top of the movable seat is fixedly connected to a roughing shaker, the bottom wall inside the roughing shaker is fixedly connected to a plurality of bed bars equidistantly distributed along the width direction of the roughing shaker, a guide plate is provided on one side of the roughing shaker, and one end of the roughing shaker is provided with a linkage part that drives the roughing shaker to rock back and forth by cooperating with the start-up of the driving mechanism.

[0024] Preferably, one end of the top of the roughing shaking table is fixedly connected to a ore sand frame for introducing ore sand, and the other end of the top of the roughing shaking table is fixedly connected to a water injection frame for introducing clean water.

[0025] Preferably, the linkage comprises a mounting base fixedly connected to the outer wall of the roughing shaker, a connecting rod 1 is hinged on the inner side of the mounting base, one end of the mounting box is rotatably connected to an eccentric wheel 1, and the outer edge of the eccentric wheel 1 is rotatably connected to the connecting rod 1.

[0026] Preferably, a cleaning piece is provided above the roughing shaker, and the cleaning piece includes a fixing frame fixedly connected to the end of the support seat, one end of the fixing frame is fixedly connected to a mounting plate, and the bottom of the mounting plate is fixedly connected to a plurality of bristles distributed in an array, and the bottom ends of several of the bristles are in contact with a bed bar.

[0027] Preferably, the selection mechanism includes a selection shaker slidably connected to the top of the support seat, and the bottom wall on the inner side of the selection shaker is fixedly connected to a plurality of bed bars equidistantly distributed along the length direction of the selection shaker. One end of the selection shaker is fixedly connected to a connecting seat, and the end of the connecting seat is rotatably connected to a connecting rod 2. The other end of the mounting box is rotatably connected to an eccentric wheel 2, and the outer edge of the eccentric wheel 2 is rotatably connected to the connecting rod 2.

[0028] Preferably, the number of the bed rails 1 and 2 is the same, and the distribution directions of the bed rails 1 and 2 are perpendicular to each other.

[0029] Preferably, the driving mechanism includes a motor fixedly mounted on the outside of the mounting box, the output shaft of the motor is fixedly connected to spur gear 1, the eccentric wheel is coaxially fixedly connected to spur gear 2, and the spur gear 2 is meshed with spur gear 1.

[0030] Preferably, the driving mechanism further comprises a bevel gear 1 fixedly connected to the output shaft of the motor, the eccentric wheel 2 is coaxially fixedly connected to the bevel gear 2, and the bevel gear 2 is meshed with the bevel gear 1.

[0031] The working principle and beneficial effects of the present invention are:

[0032] 1. By optimizing grinding fineness (-74μm accounts for 82.03%) and shaking table parameters, efficient gravity separation was achieved. Experimental data shows that ultra-high-grade gold concentrate with a gold grade of up to 350,428.3g / t can be obtained, and the gold recovery rate in the gravity separation operation is as high as 77.74%. This directly recovers most of the dissociated or easily dissociated natural gold, significantly reducing the subsequent processing load.

[0033] 2. Fine grinding (90-95% of the tailings are -45μm) and bio-oxidation (controlling the slurry concentration to 8-12%, dissolved oxygen to 3.0-4.0mg / L, pH to 1.2-1.8, and processing time to 8-10 days) effectively destroys the arsenic-sulfur minerals (such as arsenopyrite and pyrite) that encapsulate the gold. Experiments have shown that the gold cyanide leaching recovery rate after bio-oxidation increases from approximately 71.56% for direct cyanidation to over 90%.

[0034] 3. By designing a double-layer shaking table equipment that integrates roughing and fine separation, it is driven by a single motor, and the roughing shaking table and the fine separation shaking table are driven to reciprocate through gears and bevel gears. The roughing shaking table bars are distributed along the width direction, and the fine separation shaking table bars are distributed along the length direction and are perpendicular to the roughing shaking table bars. This design optimizes the sorting effect; an automatic cleaning device (brush) is set above the roughing shaking table to clean the ore sand accumulated between the bars in real time to ensure sorting efficiency and continuity. The equipment has a compact structure and reliable operation, which improves the efficiency and stability of the re-selection operation and supports the realization of the overall process benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Figure 1 This is a flow chart of a combined treatment process for the beneficiation and smelting of high-arsenic, high-sulfur heavy placer gold concentrate of the present invention;

[0037] Figure 2 The structure of the shaking table device of the present invention is shown as follows Figure 1 ;

[0038] Figure 3 The structure of the shaking table device of the present invention is shown as follows Figure 2 ;

[0039] Figure 4 It is a structural schematic diagram of the roughing mechanism of the present invention;

[0040] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of part A;

[0041] Figure 6 It is a structural schematic diagram of the cleaning piece of the present invention;

[0042] Figure 7 It is a structural schematic diagram of the selection mechanism of the present invention;

[0043] Figure 8 It is a structural schematic diagram of the driving mechanism of the present invention;

[0044] In the figure: 1. Support column; 2. Support seat; 3. Roughing mechanism; 31. Movable seat; 32. Roughing shaker; 33. Bed bar 1; 34. Guide plate; 35. Ore sand frame; 36. Water injection frame; 37. Linkage part; 371. Mounting seat; 372. Connecting rod 1; 373. Eccentric wheel 1; 38. Cleaning part; 381. Fixing frame; 382. Mounting plate; 383. Brush; 4. Selecting mechanism; 41. Selecting shaker; 42. Bed bar 2; 43. Connecting seat; 44. Connecting rod 2; 45. Eccentric wheel 2; 5. Mounting box; 6. Driving mechanism; 61. Motor; 62. Spur gear 1; 63. Spur gear 2; 64. Bevel gear 1; 65. Bevel gear 2. DETAILED DESCRIPTION

[0045] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0046] like Figure 1 This embodiment proposes a combined beneficiation and smelting process for high-arsenic, high-sulfur heavy placer gold concentrate, comprising the following steps:

[0047] Step 1: Processing of heavy sand from high-arsenic and high-sulfur gold mines. The specific implementation process is as follows:

[0048] A1. Use a crusher to crush the raw ore (particle size ≤ 300mm) to ≤ 25mm to avoid overloading the scrubber;

[0049] A2. Roll grinding the ore particles with a high-pressure roller mill with a roller gap of 8-10 mm and a linear speed of 1.8 m / s to dissociate the gold and arsenic-sulfur minerals at the interface;

[0050] A3. Use a double-slot scrubbing grinder to scrub and grind the ore to -74μm, with a scrubbing time of 18-22 minutes;

[0051] Step 2: Use shaking table equipment to conduct coarse and fine gravity separation of ore sand, with the roughing inclination angle of 4.2-4.8° and the fine separation inclination angle of 3.5-4.0°;

[0052] Step 3: Grind the tailings to -45μm, accounting for 90-95%, and then carry out biological oxidation treatment. The biological oxidation parameters are controlled as follows: slurry concentration 8-12%, dissolved oxygen 3.0-4.0mg / L, pH 1.2-1.8, and time 8-10 days;

[0053] Step 4: Using the oxidation slag cyanide carbon leaching process, the specific implementation process is as follows:

[0054] B1. Mixing the finely ground slag with circulating water to prepare a slurry with a concentration of 40%-50%;

[0055] B2. Add Ca(OH)2 (1.5 kg / t) to the slurry, stir for 30 min, then add NaOH solution to adjust the pH to 10.5;

[0056] B3. Adding a sodium cyanide (NaCN) solution having a concentration of 0.02% to 0.1% to the conditioned slurry, and pumping the cyanide-containing slurry into the first carbon leaching tank;

[0057] B4. Add granular activated carbon (GAC) to the carbon leaching tank. The slurry is continuously stirred in a reactor equipped with an impeller or air agitation device and flows forward step by step. Under strong mechanical or air agitation, sodium cyanide reacts with gold to form a stable gold-cyanide complex [Au(CN)2]-. The activated carbon is suspended in the slurry and continuously absorbs the dissolved gold-cyanide complex. Because the activated carbon is more easily absorbed than gold particles, the newly dissolved gold is quickly captured by the carbon, keeping the dissolved gold concentration in the slurry at a very low level.

[0058] B5. The tailings slurry is kept in a large thickener for a long time and aerated. The treated tailings slurry enters the thickener for concentration. The supernatant is recycled for grinding or partially discharged. The concentrated underflow enters the tailings pond for safe storage or backfill. The concentrated supernatant may be returned to the process for reuse, thereby reducing water consumption and the amount of cyanide added.

[0059] B6. The gold-loaded carbon taken out from the carbon leaching tank needs to be washed to remove the attached ore mud and debris, and then classified by the vibrating screen. The qualified gold-loaded carbon is sent to the desorption gold extraction system.

[0060] The present invention fully recovers natural gold through the "grinding + shaking table gravity separation" method to obtain a high-grade gold concentrate containing 35% gold, which can be directly smelted and pre-selected for recovery, shortening the process recovery process and reducing the recovery production cost;

[0061] Among them, such as Figure 2-Figure 8The shaking table equipment includes several support columns 1, each of which is fixedly connected to a common support base 2 at its top. A mounting box 5 is provided at one end of the support base 2, which is equipped with a drive mechanism 6. A roughing mechanism 3 is provided at the top of the support base 2, which is activated by the drive mechanism 6 to roughly select the ore. Below the roughing mechanism 3 is a concentrating mechanism 4, which is activated by the drive mechanism 6 to finely select the ore. The roughing mechanism 3 and the concentrating mechanism 4 perform a double-layer screening of the ore, which can greatly improve the gold recovery rate.

[0062] Among them, the roughing mechanism 3 includes a movable seat 31 slidably connected to the top of the support seat 2, and a roughing shaking table 32 is fixedly connected to the top of the movable seat 31. One end of the top of the roughing shaking table 32 is fixedly connected to an ore frame 35 for introducing ore sand, and the other end of the top of the roughing shaking table 32 is fixedly connected to a water injection frame 36 for introducing clean water. The bottom wall inside the roughing shaking table 32 is fixedly connected to a plurality of bed bars 33 equidistantly distributed along the width direction of the roughing shaking table 32, a guide plate 34 is provided on one side of the roughing shaking table 32, and a linkage part 37 is provided at one end of the roughing shaking table 32 for driving the roughing shaking table 32 to swing back and forth by cooperating with the start of the driving mechanism 6; the ore sand is introduced into the roughing shaking table 32 through the ore frame 35, and then the driving mechanism 6 is started so that the linkage part 37 drives the roughing shaking table 32 to swing back and forth, thereby realizing rough selection of the ore.

[0063] The linkage 37 includes a mounting base 371 fixedly connected to the outer wall of the roughing table 32. A connecting rod 1 372 is hingedly connected to the inner side of the mounting base 371. An eccentric wheel 1 373 is rotatably connected to one end of the mounting box 5. The outer edge of the eccentric wheel 1 373 is rotatably connected to the connecting rod 1 372. The rotation of the eccentric wheel 1 373 drives the connecting rod 1 372 to deflect, so that the connecting rod 1 372 drives the roughing table 32 to reciprocate and achieve rough separation of the ore.

[0064] A cleaning member 38 is positioned above the roughing shaker 32. The cleaning member 38 comprises a mounting bracket 381 fixedly connected to the end of the support base 2. A mounting plate 382 is fixedly connected to one end of the mounting bracket 381. A plurality of bristles 383 arranged in an array are fixedly connected to the bottom of the mounting plate 382. The bottom ends of the bristles 383 contact the bed rail 1 33. As the roughing shaker 32 reciprocates, it slides relative to the bristles 383, allowing the bristles 383 to remove any accumulated sand between the bed rails 1 33, preventing excessive accumulation of coarse sand on the bed rails 1 33 and affecting subsequent screening.

[0065] Among them, the selecting mechanism 4 includes a selecting shaker 41 which is slidably connected to the top of the support seat 2, and the bottom wall on the inner side of the selecting shaker 41 is fixedly connected to a number of bed strips 42 equidistantly distributed along the length direction of the selecting shaker 41, and one end of the selecting shaker 41 is fixedly connected to a connecting seat 43, and the end of the connecting seat 43 is rotatably connected to a connecting rod 2 44, and the other end of the mounting box 5 is rotatably connected to an eccentric wheel 2 45, and the outer edge of the eccentric wheel 2 45 is rotatably connected to the connecting rod 2 44, and the number of bed strips 1 33 and bed strips 2 42 is the same, and the distribution directions of bed strips 1 33 and bed strips 2 42 are perpendicular to each other.

[0066] The rotation of the second eccentric wheel 45 drives the second connecting rod 44 to deflect, so that the second connecting rod 44 drives the selection shaking table 41 to shake back and forth, thereby achieving the selection of ore sand, and cooperating with the roughing shaking table 32 to achieve double-layer screening, thereby improving the recovery rate of gold.

[0067] Among them, the driving mechanism 6 includes a motor 61 fixedly installed on the outside of the mounting box 5, the output shaft of the motor 61 is fixedly connected to the spur gear 1 62, the eccentric wheel 1 373 is coaxially fixedly connected to the spur gear 2 63, the spur gear 2 63 is meshed with the spur gear 1 62, and the output shaft of the motor 61 is also fixedly connected to the bevel gear 1 64, the eccentric wheel 2 45 is coaxially fixedly connected to the bevel gear 2 65, and the bevel gear 2 65 is meshed with the bevel gear 1 64.

[0068] Working principle: By starting the motor 61, the spur gear 1 62 is driven to rotate, so that the spur gear 2 63 rotates synchronously, so that the eccentric wheel 1 373 rotates and drives the connecting rod 1 372 to deflect, so that the connecting rod 1 372 drives the roughing shaking table 32 to shake back and forth to achieve roughing of the ore;

[0069] At the same time, the bevel gear 1 64 rotates synchronously, so that the bevel gear 2 65 drives the eccentric wheel 2 45 to rotate. The rotation of the eccentric wheel 2 45 can drive the connecting rod 2 44 to deflect, so that the connecting rod 2 44 drives the selection shaking table 41 to shake back and forth, thereby realizing the selection of ore sand, cooperating with the roughing shaking table 32 to realize double-layer screening, thereby improving the recovery rate of gold.

[0070] Experimental Example 1:

[0071] This experiment was used to conduct a shaker gravity separation test on a high-arsenic, high-sulfur heavy placer gold concentrate. The results of the multi-element analysis of the raw ore showed that the gangue minerals in the ore are silicate minerals such as quartz, which have a significant density difference from native gold and metallic arsenic sulfide ores. Gravity separation technology can be considered for recovery. By controlling the fineness of the grinding, the monomer dissociation degree of arsenic iron ore and pyrite can be increased to improve the concentrate grade. The shaker rougher concentrate is further refined to meet the needs of direct smelting. The results of the shaker recovery test at different grinding finenesses are shown in the table below:

[0072]

[0073] As can be seen from the upper right table, with the increase of grinding fineness, the gold grade of the high-grade gold concentrate produced by gravity separation gradually increases. When the grinding fineness is 74μm, accounting for 82.03%, the gold grade of the high-grade concentrate reaches 350428.3g / t, and the recovery rate of the shaking table concentrate operation is as high as 77.74%. When the grinding fineness is further increased, although the gold grade of the concentrate increases slightly, the concentrate recovery rate decreases significantly. Therefore, the optimal grinding fineness recommended is -74μm, accounting for 82.03%.

[0074] Experimental Example 2:

[0075] This experimental example conducts a shaker tailings regrinding and leaching test. In order to promote the full exposure of the gold surface and further improve the smelting recovery rate of the shaker tailings, the shaker tailings need to be regrinded and then leached. The test results of the regrinding fineness conditions are shown in the following table:

[0076]

[0077] It can be seen from the above table that with the increase of grinding fineness, the recovery rate of gold cyaniding operation increases. When the grinding fineness is -45μm and the content accounts for 93.06%, the gold recovery rate does not increase significantly when the grinding fineness is further increased. Moreover, under the condition of sufficient grinding and dissociation, the recovery rate of gold direct cyaniding operation is only 71.56%. The direct cyaniding recovery rate index is low, mainly because part of the gold is still wrapped by pyrite, arsenopyrite, etc. The next step can be to use biological oxidation pretreatment process for desulfurization and dearsenicization.

[0078] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A combined beneficiation and smelting process for high-arsenic, high-sulfur heavy placer gold concentrate, characterized in that: The steps include: Step 1: Processing of heavy sand from high-arsenic and high-sulfur gold mines. The specific implementation process is as follows: A1. Use a crusher to crush the raw ore (particle size ≤ 300mm) to ≤ 25mm to avoid overloading the scrubber; A2. Roll grinding the ore particles with a high-pressure roller mill with a roller gap of 8-10 mm and a linear speed of 1.8 m / s to dissociate the gold and arsenic-sulfur minerals at the interface; A3. Use a double-slot scrubbing grinder to scrub and grind the ore to -74μm, with a scrubbing time of 18-22 minutes; Step 2: Use shaking table equipment to conduct coarse and fine gravity separation of ore sand, with the roughing inclination angle of 4.2-4.8° and the fine separation inclination angle of 3.5-4.0°; Step 3: Grind the tailings to -45μm, accounting for 90-95%, and then carry out biological oxidation treatment. The biological oxidation parameters are controlled as follows: slurry concentration 8-12%, dissolved oxygen 3.0-4.0mg / L, pH 1.2-1.8, and time 8-10 days; Step 4: Using the oxidation slag cyanide carbon leaching process, the specific implementation process is as follows: B1. Mixing the finely ground slag with circulating water to prepare a slurry with a concentration of 40%-50%; B2. Add Ca(OH)2 (1.5 kg / t) to the slurry, stir for 30 minutes, then add NaOH solution to adjust the pH to 10.5; B3. Add sodium cyanide (NaCN) solution with a concentration of 0.02%-0.1% to the adjusted slurry and pump the cyanide-containing slurry into the first carbon leaching tank; B4. Add granular activated carbon (GAC) to the carbon leaching tank. The slurry is continuously stirred in a reactor equipped with an impeller or air agitation device and flows forward step by step. Under strong mechanical or air agitation, sodium cyanide reacts with gold to form a stable gold-cyanide complex [Au(CN)2]⁻. The activated carbon is suspended in the slurry and continuously absorbs the dissolved gold-cyanide complex. Because the activated carbon is more easily absorbed than gold particles, the newly dissolved gold is quickly captured by the carbon, keeping the dissolved gold concentration in the slurry at a very low level. B5. The tailings slurry is kept in a large thickener for a long time and aerated. The treated tailings slurry enters the thickener for concentration. The supernatant is recycled for grinding or partially discharged. The concentrated underflow enters the tailings pond for safe storage or backfill. The concentrated supernatant may be returned to the process for reuse, thereby reducing water consumption and the amount of cyanide added. B6. The gold-loaded carbon taken out from the carbon leaching tank needs to be washed to remove the attached ore mud and debris, and then classified by the vibrating screen. The qualified gold-loaded carbon is sent to the desorption gold extraction system.

2. A combined treatment process for the beneficiation and smelting of high-arsenic and high-sulfur heavy placer gold concentrate according to claim 1, characterized in that: The shaking table device comprises a plurality of support columns (1), the tops of the plurality of support columns (1) are fixedly connected to a same support base (2), one end of the support base (2) is provided with a mounting box (5), a driving mechanism (6) is provided on the mounting box (5), a roughing mechanism (3) is provided on the top of the support base (2) for roughing the ore sand by cooperating with the activation of the driving mechanism (6), and a concentrating mechanism (4) is provided below the roughing mechanism (3) for concentrating the ore sand by cooperating with the activation of the driving mechanism (6).

3. A combined treatment process for the beneficiation and smelting of high-arsenic and high-sulfur heavy placer gold concentrate according to claim 2, characterized in that: The roughing mechanism (3) includes a movable seat (31) slidably connected to the top of the support seat (2), a roughing shaker (32) is fixedly connected to the top of the movable seat (31), a bottom wall inside the roughing shaker (32) is fixedly connected to a plurality of bed bars (33) equidistantly distributed along the width direction of the roughing shaker (32), a guide plate (34) is provided on one side of the roughing shaker (32), and a linkage member (37) is provided at one end of the roughing shaker (32) for driving the roughing shaker (32) to reciprocate by cooperating with the start of the driving mechanism (6).

4. A combined treatment process for the beneficiation and smelting of high-arsenic and high-sulfur heavy placer gold concentrate according to claim 3, characterized in that: One end of the top of the roughing shaking table (32) is fixedly connected to a ore sand frame (35) for introducing ore sand, and the other end of the top of the roughing shaking table (32) is fixedly connected to a water injection frame (36) for introducing clean water.

5. A combined treatment process for the beneficiation and smelting of high-arsenic and high-sulfur heavy placer gold concentrate according to claim 4, characterized in that: The linkage member (37) includes a mounting seat (371) fixedly connected to the outer wall of the roughing shaker (32), a connecting rod (372) is hinged on the inner side of the mounting seat (371), an eccentric wheel (373) is rotatably connected to one end of the mounting box (5), and an outer edge of the eccentric wheel (373) is rotatably connected to the connecting rod (372).

6. A combined treatment process for the beneficiation and smelting of high-arsenic and high-sulfur heavy placer gold concentrate according to claim 4, characterized in that: A cleaning member (38) is provided above the roughing shaker (32), and the cleaning member (38) comprises a fixing frame (381) fixedly connected to the end of the support seat (2), one end of the fixing frame (381) is fixedly connected to a mounting plate (382), and the bottom of the mounting plate (382) is fixedly connected to a plurality of bristles (383) distributed in an array, and the bottom ends of the plurality of bristles (383) are in contact with the bed bar (33).

7. The combined beneficiation and smelting process of high-arsenic and high-sulfur heavy placer gold concentrate according to claim 5, characterized in that: The selection mechanism (4) includes a selection rocking table (41) slidably connected to the top of the support seat (2), a plurality of bed bars (42) equidistantly distributed along the length direction of the selection rocking table (41) are fixedly connected to the bottom wall of the inner side of the selection rocking table (41), one end of the selection rocking table (41) is fixedly connected to a connecting seat (43), the end of the connecting seat (43) is rotatably connected to a connecting rod (44), the other end of the installation box (5) is rotatably connected to an eccentric wheel (45), and the outer edge of the eccentric wheel (45) is rotatably connected to the connecting rod (44).

8. A combined treatment process for the beneficiation and smelting of high-arsenic and high-sulfur heavy placer gold concentrate according to claim 7, characterized in that: The number of the bed strips 1 (33) and 2 (42) is the same, and the distribution directions of the bed strips 1 (33) and 2 (42) are perpendicular to each other.

9. The combined beneficiation and smelting process of high-arsenic and high-sulfur heavy placer gold concentrate according to claim 7, characterized in that: The driving mechanism (6) includes a motor (61) fixedly mounted on the outside of the mounting box (5), the output shaft of the motor (61) is fixedly connected to a spur gear 1 (62), the eccentric wheel 1 (373) is coaxially fixedly connected to a spur gear 2 (63), and the spur gear 2 (63) is meshed with the spur gear 1 (62).

10. A combined beneficiation and smelting process for high-arsenic, high-sulfur heavy placer gold concentrate according to claim 9, characterized in that: The driving mechanism (6) further comprises a bevel gear 1 (64) fixedly connected to the output shaft of the motor (61), the eccentric wheel 2 (45) is coaxially fixedly connected to the bevel gear 2 (65), and the bevel gear 2 (65) is meshed with the bevel gear 1 (64).

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