Negative pressure suction filtration type cyanidation gold extraction system and control method thereof

Abstract

The invention discloses a negative pressure suction filtration type cyanidation gold extraction system and a control method thereof. And a negative pressure chamber is arranged below the leaching pool through a filter plate. The upper end of a connecting container of the negative pressure manufacturing device is connected with a negative pressure chamber, and the lower end is connected with the upper end of an L-shaped pipe. And the lower end of the L-shaped pipe is sequentially connected with a water tank and a water pump. The water tank is provided with an air pressure communicating pipe and a liquid level meter. A plurality of slurry making pipes are connected to the bottom of a water distribution box of the boiling slurry making device, a fluid inlet pipe is connected to one side, and the tail end of the fluid inlet pipe is used for being connected with a barren liquor submersible pump or a clean water pump or an air compressor. And a crane used for filling and digging gold-bearing ores and hanging the boiling slurry making device in the leaching process is arranged above the leaching pool. The leaching efficiency and the washing efficiency are improved, and the water content of the cyanogen residues is reduced; the investment cost of a cyaniding gold extraction system is reduced, the operation efficiency is improved, and the process index is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of precious metal refining and relates to a cyanidation gold extraction system and a control method thereof. Background Art

[0002] Cyanide gold extraction mainly includes leaching, washing, carbon adsorption and cyanide residue dehydration. Among them, leaching is the process of dissolving gold in oxygen-containing cyanide (or environmentally friendly gold extraction agent) solution; washing is the process of reducing the gold ion concentration of the gold-containing solution after leaching; carbon adsorption is the process of recovering gold ions from the gold-containing solution after cyanide leaching by adsorption of activated carbon; cyanide residue dehydration is the process of solid-liquid separation of cyanide residue and barren solution. Cyanide gold extraction involves factors such as gold particle state, ore pulp concentration, cyanide (or environmentally friendly gold extraction agent) concentration, oxygen concentration, pH value and leaching time.

[0003] The traditional cyanide leaching device is a mechanically stirred leaching tank, the tank body of which is welded by rolling steel plates, with a hollow shaft and a stirring impeller in the middle. The hollow shaft plays an aerating role, and the impeller plays a stirring role of the slurry. The traditional cyanide washing device is a single-layer or multi-layer thickener, which reduces the gold ion concentration of the gold-containing solution in the slurry through countercurrent washing to form precious liquid and lean liquid. The traditional cyanide dehydration device is a filter press, which injects the slurry into the filter chamber formed by adjacent filter plates through a slurry pump, applies pressure to discharge the water through the filter cloth, and the cyanide residue remains in the filter chamber to form a filter cake. The above-mentioned device has high investment cost, long construction period, large floor space, low washing efficiency, and high water content of the cyanide residue filter cake, which has a certain impact on the operating cost and process indicators of the cyanide gold extraction system. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a negative pressure suction filtration type cyanidation gold extraction system and a control method thereof, firstly, to improve the leaching efficiency, and at the same time improve the solid-liquid separation effect, improve the washing efficiency, and reduce the water content of the cyanide slag; secondly, to reduce the investment cost of the cyanidation gold extraction system, and improve the operating efficiency and improve the process indicators; thirdly, to obtain a higher ore processing capacity.

[0005] The technical solution of the present invention is as follows:

[0006] A negative pressure suction filtration type cyanide gold extraction system comprises a sedimentation tank, a settling tank, a noble liquid tank, a carbon adsorption device and a lean liquid tank, the system further comprises one or more leaching tanks and boiling pulping devices corresponding to the leaching tanks one by one; the leaching tank is provided with a drainage pipe connected to the sedimentation tank and an overflow pipe connected to the sedimentation tank; a negative pressure chamber is provided below the leaching tank through a filter plate; the system further comprises a negative pressure manufacturing device; the negative pressure manufacturing device comprises a connecting container and an L-shaped tube, the upper end of the connecting container is connected to each negative pressure chamber through a negative pressure tube, and the lower end is connected to the upper end of the L-shaped tube; the upper end of the L-shaped tube is connected to a water supply pipe and an exhaust pipe, and the lower end of the L-shaped tube is connected to a water tank; the water tank is connected to a variable pressure pump through a water pump inlet pipe A water pump driven by a variable frequency speed regulating motor; an air pressure connecting pipe is installed at the upper end of the water tank; a liquid level gauge is also installed on the water tank, which is located above the air pressure connecting pipe and is used to sense and measure the water level in the water tank; the negative pressure manufacturing device also includes a controller for collecting water level data in the water tank through the liquid level gauge and controlling the variable frequency speed regulating motor; the system also includes a boiling pulping device; the boiling pulping device includes a water distribution tank, a plurality of pulping pipes are connected to the bottom of the water distribution tank, and a fluid inlet pipe is connected to one side, and the end of the fluid inlet pipe is used to connect a lean liquid submersible pump, a clean water pump or an air compressor; a crane is provided above each leaching tank for loading and digging gold-containing ore and hanging the boiling pulping device during the leaching process.

[0007] Preferably, the number of the leaching tanks is determined by calculation according to Formula 1:

[0008] Formula 1:

[0009] Where G is the number of leaching tanks, pieces;

[0010] K-redundancy coefficient, generally 1.1 to 1.2;

[0011] Q-daily ore processing capacity, tons / day;

[0012] t-leaching time determined by boiling pulping leaching test, h;

[0013] a- leaching tank length, m;

[0014] b- leaching tank width, m;

[0015] c-thickness of the gold-bearing ore layer in the leaching tank, m;

[0016] ρ-ore bulk density, t / m 3 .

[0017] Preferably, the diameter and height of the L-shaped tube are calculated and determined according to Formula 2 and Formula 3:

[0018] Formula 2:

[0019] Where φ-L-shaped tube diameter, m;

[0020] K0-redundancy coefficient, generally 1.1~1.2;

[0021] μ-the flow rate of the liquid in the L-shaped tube, which is generally designed to be 0.1-0.2 m / s;

[0022] V- filtrate output of the leaching tank determined by negative pressure filtration experiment, m 3 / s;

[0023] Formula 3: H = K1hP (ρ0 / ρ);

[0024] Wherein, the height difference between the lower edge of the exhaust pipe at the top of the HL-shaped tube and the highest liquid level in the water tank is m;

[0025] K1-redundancy coefficient, generally 1.1~1.2;

[0026] h-the height of a water column that can be supported by ten standard atmospheres, which is 103.4m / Mpa;

[0027] P-vacuum degree required for leaching tank design, MPa;

[0028] ρ0-Clean water density, t / m 3 ;

[0029] ρ-filtrate density, t / m 3 .

[0030] Preferably, the upper part of the sedimentation tank is a cylindrical cylinder with an overflow trough and a feeding barrel, and the lower part is a conical cylinder. The bottom end of the conical cylinder is connected to an underflow slurry pump through a discharge pipe, and the underflow slurry pump is connected to each leaching tank through a pipeline; the overflow trough is connected to the sedimentation tank through a clear liquid overflow pipe; the feeding barrel is connected to the discharge end of the overflow pipe.

[0031] Further preferably, the diameter of the cylindrical barrel is calculated and determined according to Formula 4:

[0032] Formula 4:

[0033] Where φ is the diameter of the cylindrical tube of the sedimentation tank, m;

[0034] K0-safety factor, generally 1.1~1.2;

[0035] V1- turbid liquid yield determined by boiling pulp leaching test, m 3 / h;

[0036] ρ1-density of turbid liquid, t / m 3 ;

[0037] Where ρ1=100 / (C1 / ρ2+100-C1)

[0038] C1-mass concentration of turbid liquid fed into the sedimentation tank, %;

[0039] C2-mass concentration of underflow slurry discharged from the sedimentation tank, %;

[0040] ρ2-suspended matter density, t / m 3 ;

[0041] S-mass of suspended solids treated per unit area of ​​sedimentation tank per unit time, t / (m 2 .h);

[0042] Where S = V P / (R1-R2);

[0043] R1-liquid-to-solid ratio when the concentration of turbid liquid fed into the sedimentation tank is C1;

[0044] R2-liquid-to-solid ratio when the concentration of underflow slurry discharged from the sedimentation tank is C2;

[0045] V P - Average settling velocity of suspended matter when a turbid liquid settles to the required underflow concentration, determined by sedimentation experiments, m / h.

[0046] Preferably, the lean liquid pool is located on one side of the precious liquid pool; the lean liquid pool is provided with a sodium cyanide or environmentally friendly gold extraction agent solution addition pipe and a lime solution addition pipe; the lean liquid pool is provided with a lean liquid submersible pump for transporting the lean liquid in the lean liquid pool to the fluid inlet pipe; the precious liquid pool is located at the end of the sedimentation tank; the carbon adsorption device is arranged above the precious liquid pool; the water pump is connected to the sedimentation tank through a water pump drainage pipe.

[0047] The control method of the negative pressure filtration type cyanide gold extraction system,

[0048] Step 1: Use an electric grab bucket to load gold-containing ore raw materials into the leaching tank and trim and level them;

[0049] Step 2: injecting lean solution into the leaching tank, requiring the lean solution to cover the gold-containing ore raw material layer;

[0050] Step 3: Turn on the negative pressure manufacturing device, and use an electric crane to hang the boiling pulping device from the front end to the rear end of the leaching tank to perform boiling pulping in sections; during the process, the boiling pulping device is first filled with high-pressure air through the fluid inlet pipe, the electric crane hook falls, and the pulping pipe is inserted into the gold ore raw material layer. After the air is continuously filled in the process, the lean liquid is filled in through the fluid inlet pipe;

[0051] Step 4: After the boiling pulping operation in the leaching tank is completed, let it stand until the supernatant is completely clarified, open the drain pipe valve, and the supernatant is discharged into the sedimentation tank by gravity;

[0052] Step 5: After the above operations are completed, the cyanide residue in the leaching tank is further discharged through negative pressure filtration; when the overall moisture content reaches below 15%, the cyanide residue is taken out using an electric grab.

[0053] Furthermore, the specific control method of the negative pressure manufacturing device is as follows:

[0054] Step (a): Close the water tank drain pipe valve and the water pump inlet pipe valve, and open the exhaust pipe valve, the air pressure connecting pipe valve and the water supply pipe valve in sequence, and add lean liquid to the L-shaped pipe and the water tank through the water supply pipe;

[0055] Step (ii): When the air pressure connecting pipe begins to overflow, close the air pressure connecting pipe valve; when the exhaust pipe begins to overflow, close the water supply pipe valve and the exhaust pipe valve in sequence;

[0056] Step (III): After the water replenishment is completed, the water pump is started, the water pump water inlet pipe valve and the air pressure connecting pipe valve are opened in sequence, and part of the liquid in the leaching tank is extracted through the filter plate, and then discharged to the sedimentation tank by the water pump through the negative pressure pipe, L-shaped pipe, water tank in sequence;

[0057] During the negative pressure filtration operation, the operating frequency is adjusted in time through the liquid level detection data and the controller to control the water pump's discharge volume and ensure that the liquid level in the water tank is within the set range, thereby obtaining a continuous and stable vacuum negative pressure effect.

[0058] Compared with the prior art, the positive effect of the present invention is that the system provides basic conditions for ore leaching by constructing several leaching tanks on site, filling the interior with gold-containing ore, and injecting alkaline cyanide solution or environmentally friendly gold extraction agent solution. An overflow pipe and a drain pipe are arranged at the top of the leaching tank, and a negative pressure chamber is arranged at the bottom, and the negative pressure chamber is connected to the negative pressure manufacturing device through a negative pressure pipe. The lean liquid is made to penetrate the gold ore raw material layer uniformly and quickly through the negative pressure manufacturing device, thereby improving the leaching efficiency, improving the solid-liquid separation effect, improving the washing efficiency, and reducing the water content of the cyanide slag. The present invention excavates and constructs a sedimentation tank, a settling tank, a noble liquid tank, and a lean liquid tank on one side of the leaching tank, and arranges a carbon adsorption tank to achieve gold-containing liquid purification and gold ion adsorption recovery. The cyanide gold extraction system of the present invention can play the role of leaching, washing, carbon adsorption, and cyanide slag dehydration, with low investment cost, short construction period, high operating efficiency, excellent process indicators, and easy operation and control. In addition, the leaching tank, settling tank, sedimentation tank, etc. are simple in structure and large in volume, and a higher ore processing capacity can be obtained. The details are as follows:

[0059] (1) The system of the present invention can replace a series of equipment and facilities in the prior art, such as leaching tanks, washing and thickening machines, decarbonization screens and filter presses. The construction costs of leaching tanks, negative pressure manufacturing devices, sedimentation tanks, sedimentation tanks, precious liquid tanks, and lean liquid tanks are mostly civil engineering investments, and can be built using idle mine shafts or mountainous terrain. Under the same processing capacity, the investment can be reduced by about 70% compared with the prior art, and the floor space can be reduced by about 50%.

[0060] (2) The leaching tank and other facilities of the present invention can play multiple roles, have multiple effects, have a short process flow, have centralized equipment and facilities, simple production operation, and are easy to realize production automation, which can reduce the number of post personnel by 30-50%.

[0061] (3) The boiling pulping device in the present invention can continuously charge sodium cyanide or environmentally friendly gold extracting agent, lime and air into the leaching tank, and in the boiling pulping process, a more complete diffusion contact of gold particles, sodium cyanide or environmentally friendly gold extracting agent and oxygen is achieved, which is more conducive to the efficient leaching chemical reaction.

[0062] (4) The negative pressure manufacturing device of the present invention can continuously filter the liquid in the leaching tank under negative pressure. A large amount of liquid is forced to penetrate the ore layer and discharged from the bottom filter plate, ensuring that the leaching reaction in each part of the gold-containing ore raw material layer is more uniform and efficient.

[0063] (5) The present invention uses lean liquid for boiling pulping, and after the last boiling pulping is completed, negative pressure filtration can be performed continuously for several hours. Based on this, the water content of cyanide slag can be greatly reduced, the amount of gold-containing liquid in the cyanide slag can be reduced, and the dehydration time of cyanide slag can be greatly shortened, thereby improving the operation efficiency. In addition, since the present invention performs intermittent processing of the gold-containing ore raw materials in batches, it can be aired to reduce its water content. After the airing operation is carried out, part of the clean water can be used for the last boiling pulping, and negative pressure filtration can be used to evenly penetrate the gold-containing ore raw material layer, thereby further improving the washing effect and reducing the loss of valuable metals.

[0064] (6) In the production process of the present invention, the gold-containing ore raw materials are only loaded and excavated before and after the boiling pulping operation. The ore raw materials are placed in the leaching tank at other times. The process operation only transports and reverses the clarified liquid or the turbid liquid containing a small amount of suspended matter, and most of it can be transported by gravity using the height difference of the facilities. The operation energy consumption is low, and the equipment and facilities are lightly worn. Under the same processing capacity, the operation cost can be reduced by more than 40% compared with the prior art.

[0065] (7) The entire system has a simple configuration, a short process flow, a low probability of leakage, and achieves water balance without sewage discharge, thus achieving inherent safety and environmental protection.

[0066] In general, the system of the present invention can greatly simplify the equipment and facilities of the cyanidation gold extraction process, save infrastructure investment, reduce floor space, reduce operating personnel, and reduce operation and maintenance costs. It has high production efficiency, excellent process indicators, high application value and broad promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a plan view of an embodiment of a cyanide gold extraction system of the present invention;

[0068] Figure 2 It is a schematic elevation view of an embodiment of a cyanidation gold extraction system of the present invention;

[0069] Figure 3 It is a front view structural schematic diagram of a leaching tank in an embodiment of a cyanide gold extraction system of the present invention;

[0070] Figure 4 It is a side view structural schematic diagram of a leaching tank in an embodiment of a cyanide gold extraction system of the present invention;

[0071] Figure 5 A schematic diagram of the structure of a sedimentation tank in an embodiment of a cyanide gold extraction system of the present invention;

[0072] Figure 6 It is a structural schematic diagram of a carbon adsorption device in an embodiment of a cyanide gold extraction system of the present invention;

[0073] Figure 7 It is a structural schematic diagram of a boiling pulping device in an embodiment of a cyanide gold extraction system of the present invention;

[0074] Figure 8 It is a schematic diagram of the upper structure of the negative pressure manufacturing device in the embodiment of the cyanide gold extraction system of the present invention;

[0075] Fig. 9 It is a schematic diagram of the lower structure of the negative pressure manufacturing device in the embodiment of the cyanide gold extraction system of the present invention.

[0076] Description of reference numerals:

[0077] 1. Leaching tank; 1-1. Negative pressure chamber; 1-2. Filter plate; 1-3. Overflow pipe; 1-4. Drain pipe; 1-5. Drain pipe valve; 1-6. Negative pressure pipe; 1-7. Negative pressure pipe valve; 2. Negative pressure manufacturing device; 2-1. Connecting container; 2-2. Water supply pipe; 2-2-1. Water supply pipe valve; 2-3. Exhaust pipe; 2-3-1. Exhaust pipe valve; 2-4. L-shaped pipe; 2-5. Water tank; 2-5-1. Air pressure connecting pipe; 2-5-2. Air pressure connecting pipe valve; 2-5-3. Water tank drain pipe; 2-5-4. Water tank drain pipe valve; 2-6. Water pump; 2-6-1. Water pump inlet pipe; 2-6-2. Water pump inlet pipe valve; 2-6-3. Water pump drain pipe; 2-7. Liquid level meter; 3. Sedimentation tank; 3- 1. Cylindrical cylinder; 3-2. Conical cylinder; 3-3. Feeding cylinder; 3-4. Overflow trough; 3-5. Clear liquid overflow pipe; 3-6. Bottom flow slurry pump; 4. Sedimentation tank; 5. Precious liquid tank; 5-1. Precious liquid submersible pump; 6. Carbon adsorption device; 6-1. Water inlet pipe; 6-2. Water outlet pipe; 6-3. Carbon adsorption tank; 6-4. Bottom plate; 6-5. Top plate; 6-6. Water inlet channel; 6-7. Water outlet channel; 6-8. Lower sieve plate; 6-9. Upper sieve plate; 7. Lean liquid tank; 7-1. Lean liquid submersible pump; 8. Sodium cyanide or environmentally friendly gold extraction agent solution addition pipe; 9. Lime solution addition pipe; 10. Boiling pulping device; 10-1. Water distribution tank; 10-2. Pulping pipe; 10-3. Diagonal support; 10-4. Counterweight tank; 10-5. Fluid inlet pipe. DETAILED DESCRIPTION

[0078] In order to make the present invention better understood by the persons skilled in the art, the present invention is further described below in conjunction with the embodiments, drawings and field applications. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work should belong to the scope of protection of the present invention.

[0079] like Figures 1 to 4 , an embodiment of the cyanide gold extraction system of the present invention includes one or more (five in this embodiment) leaching tanks 1 arranged in parallel and independently operated. The length of the leaching tank is preferably 50.0m, the width is preferably 5.0m, the height is preferably 3.0m, the slope of the bottom of the tank is about 1%, and the tank body is entirely on the ground. The side walls and bottom of the leaching tank are cast with reinforced concrete. In addition, a drain pipe 1-4 and an overflow pipe 1-3 higher than the drain pipe 1-4 are provided at the end of the leaching tank. A drain pipe valve 1-5 is installed on the branch pipeline between each leaching tank and the drain pipe 1-4.

[0080] A negative pressure chamber 1-1 is provided below the leaching tank 1. The negative pressure chamber is 50m long, 5.0m wide, 0.5m high, and has a slope of about 1%. The top of the negative pressure chamber is made of an H-shaped steel mesh support beam, which is fixed to the side wall of the leaching tank, and a filter plate 1-2 is laid above the support beam. The filter plate is made of steel frame nylon, with a length × width × height = 5.0 × 5.0 × 0.05m. The filter plate is covered with 40 × 40mm square seepage holes, with a horizontal center spacing of 100mm and a vertical center spacing of 200mm; two layers of 400g / m 2 Geotextile. Each leaching tank is equipped with a grab-type electric crane for loading and digging gold-bearing ore and hanging boiling slurry making device during leaching. The leaching tank has multiple functions such as leaching, washing and dehydrating gold-bearing ore.

[0081] The number of leaching tanks 1 is related to the size of the leaching tank, the ore processing capacity, the ore bulk density, the leaching time, etc. The specific value is calculated and determined according to Formula 1.

[0082] Formula 1:

[0083] Where G is the number of leaching tanks, pieces;

[0084] K-redundancy coefficient, generally 1.1 to 1.2;

[0085] Q-daily ore processing capacity, tons / day;

[0086] t-leaching time determined by boiling pulping leaching test, h;

[0087] a- leaching tank length, m;

[0088] b- leaching tank width, m;

[0089] c-thickness of the gold-bearing ore layer in the leaching tank, m;

[0090] ρ-ore bulk density, t / m 3 .

[0091] The embodiment of the cyanide gold extraction system of the present invention further includes a negative pressure manufacturing device 2. Figure 1 , Figure 2 , Figure 3 , Figure 8 and Fig. 9The negative pressure manufacturing device 2 is located as a whole below the ground surface, and includes a connecting container 2-1 and an L-shaped tube 2-4. The longitudinal section of the L-shaped tube 2-4 is arranged perpendicular to the horizontal plane, and the transverse section is arranged parallel to the horizontal plane. The upper end of the connecting container 2-1 is connected to each negative pressure chamber 1-1 through a negative pressure tube 1-6, and a negative pressure tube valve 1-7 is installed on the branch pipeline between the negative pressure tube 1-6 and each negative pressure chamber 1-1. The lower end of the connecting container 2-1 is connected to the upper end of the longitudinal section of the L-shaped tube 2-4. The upper end of the longitudinal section of the L-shaped tube 2-4 is connected to a water supply pipe 2-2 with a water supply pipe valve 2-2-1 and an exhaust pipe 2-3 with an exhaust pipe valve 2-3-1. The outer end of the transverse section of the L-shaped tube 2-4 is connected to a water tank 2-5.

[0092] The water tank 2-5 is connected to a water pump 2-6 through a water pump inlet pipe 2-6-1 with a water pump inlet pipe valve 2-6-2. The water pump 2-6 is connected to a water pump drain pipe 2-6-3. The other end of the water pump drain pipe 2-6-3 is connected to a sedimentation tank 4.

[0093] The water pump 2-6 adopts a variable frequency speed regulating motor. An air pressure connecting pipe 2-5-1 with an air pressure connecting pipe valve 2-5-2 is installed on the upper end of the water tank 2-5. The air pressure connecting pipe 2-5-1 is arranged vertically. The water tank 2-5 is also equipped with a liquid level meter 2-7 located directly above the air pressure connecting pipe 2-5-1 and used for sensing and measuring the water level in the water tank 2-5. The liquid level meter 2-7 is generally a radar level meter, a laser level meter or an ultrasonic level meter. The bottom side or lower end of the water tank 2-5 is also connected to a water tank drain pipe 2-5-3 with a water tank drain pipe valve 2-5-4.

[0094] The embodiment of the system of the present invention also includes a controller for collecting water level data in the water tank 2-5 through the liquid level meter 2-7 and for controlling the variable frequency speed regulating motor.

[0095] The diameter and height of the L-shaped pipe are related to the filtrate output in the leaching tank and the designed negative pressure strength, and the specific values ​​are calculated and determined according to formulas 2 and 3.

[0096] Formula 2:

[0097] Where φ-L-shaped tube diameter, m;

[0098] K0-redundancy coefficient, generally 1.1~1.2;

[0099] μ -The flow rate of the liquid in the L-shaped tube is generally designed to be 0.1-0.2 m / s;

[0100] V- filtrate output of the leaching tank determined by negative pressure filtration experiment, m 3 / s.

[0101] Formula 3: H = K1hP (ρ0 / ρ);

[0102] Wherein, the height difference between the lower edge of the exhaust pipe at the top of the HL-shaped tube and the highest liquid level in the water tank is m;

[0103] K1-redundancy coefficient, generally 1.1~1.2;

[0104] h-the height of a water column that can be supported by ten standard atmospheres, which is 103.4m / Mpa;

[0105] P-vacuum degree required for leaching tank design, MPa;

[0106] ρ0-Clean water density, t / m 3 ;

[0107] ρ-filtrate density, t / m 3 .

[0108] The embodiment of the cyanide gold extraction system of the present invention further includes a sedimentation tank 3, a precipitation tank 4, a noble liquid tank 5, a set of carbon adsorption devices 6, a lean liquid tank 7 and five sets (the number corresponds to the leaching tank 1) of boiling pulping devices 10. The overflow end of the overflow pipe 1-3 is connected to the sedimentation tank 3. The discharge end of the discharge pipe 1-4 is connected to the sedimentation tank 4.

[0109] like Figure 7 The boiling pulping device 10 is composed of a water distribution tank 10-1, a pulping pipe 10-2 in the form of a galvanized pipe, a counterweight tank 10-4, a fluid inlet pipe 10-5 and an automatic coiler. Among them, the water distribution tank 10-1 is made of iron plate welding and is in the shape of a rectangular parallelepiped, with a length × width × height = 5.0 × 4.5 × 0.35m; nine DN25mm pulping pipes 10-2 are vertically welded at a spacing of 1.7m at the bottom of the water distribution tank 10-1, each with a length of 3.0m. The upper 1 / 3 of each pulping pipe 10-2 is welded and fixed with a diagonal brace 10-3 (20# round steel). In addition, the end of the pulping pipe 10-2 is processed into a pointed head to facilitate insertion into the slurry layer. The upper part of the water distribution tank 10-1 is welded with a steel plate to form a counterweight tank 10-4 with a length × width × height = 0.50 × 0.45 × 0.20, which is used to place counterweight blocks to help the pulping pipe 10-2 insert into the slurry layer. A DN50mm fluid inlet pipe 10-5 is connected to one side of the long side of the water distribution tank 10-1. It is required to be a hose and fixed with an automatic hose reel. It can move back and forth along the leaching tank 1 with the boiling pulping device 10. The end is used to connect the lean liquid supply pipeline of the lean liquid submersible pump 7-1, the clean water supply pipeline of the clean water pump or the high-pressure gas supply pipeline of the air compressor. Different pipelines are respectively provided with control valves. Among them, the function of the lean liquid supply pipeline is to transport lean liquid to the leaching tank 1, the function of the air compressor high-pressure gas supply pipeline is to transport high-pressure gas to the water distribution tank 10-1, and the function of the clean water supply pipeline is to provide clean water for washing after all the boiling pulping operations are completed.

[0110] like Figure 5 The sedimentation tank 3 is made of galvanized canvas, and its upper part is a cylindrical tube 3-1 with an overflow trough 3-4 and a feed tube 3-3, preferably with a height of 2.0m, partly above the ground surface and partly below the ground surface. The lower part of the sedimentation tank 3 is a conical tube 3-2, and the cone angle of the conical tube 3-2 is preferably 60°. The upper end of the conical tube 3-2 is connected to the lower end of the cylindrical tube 3-1, and the bottom end of the conical tube 3-2 is connected to an underflow slurry pump 3-6 through a discharge pipe, and the underflow slurry pump 3-6 is connected to each leaching tank 1 through a pipeline. The overflow trough 3-4 is connected to the sedimentation tank 4 through a clear liquid overflow pipe 3-5.

[0111] The diameter (inner diameter) of the cylindrical tube 3 - 1 of the sedimentation tank 3 is related to the volume and concentration of the input turbid liquid, the concentration of the underflow slurry, the sedimentation velocity, the density of the suspended matter, etc., and is specifically calculated using Formula 4.

[0112] Formula 4:

[0113] Where φ is the diameter of the cylindrical tube of the sedimentation tank, m;

[0114] K0-safety factor, generally 1.1~1.2;

[0115] V1- turbid liquid yield determined by boiling pulp leaching test, m 3 / h;

[0116] ρ1-density of turbid liquid, t / m 3 ;

[0117] Where ρ1=100 / (C1 / ρ2+100-C1)

[0118] C1-mass concentration of turbid liquid fed into the sedimentation tank, %;

[0119] C2-mass concentration of underflow slurry discharged from the sedimentation tank, %;

[0120] ρ2-suspended matter density, t / m 3 ;

[0121] S-mass of suspended solids treated per unit area of ​​sedimentation tank per unit time, t / (m 2 .h);

[0122] Where S = V P / (R1-R2)

[0123] R1-liquid-to-solid ratio when the concentration of turbid liquid fed into the sedimentation tank is C1;

[0124] R2-liquid-to-solid ratio when the concentration of underflow slurry discharged from the sedimentation tank is C2;

[0125] VP - Average settling velocity of suspended matter when a turbid liquid settles to the required underflow concentration, determined by sedimentation experiments, m / h.

[0126] Still Figure 1 The sedimentation tank 4 is generally composed of four sub-tanks, which are operated in series. The sedimentation tank is excavated and constructed on site, with a length of 25.0m, a width of 10.0m and a depth of 5.0m. The side walls and bottom of the sedimentation tank 4 are cast with reinforced concrete, and overflow ports are provided between different sub-tanks. During normal production, the four sub-tanks are operated in series. When dredging is required (once every 0.5-1 year), the dredging can be stopped separately, and the other sub-tanks can be operated normally in series. The sedimentation tank 4 is mainly used for the sedimentation and purification of the filtrate at the bottom of the leaching tank, the upper drainage after the boiling pulping of the leaching tank, and the overflow of the sedimentation tank to remove suspended matter in the liquid.

[0127] The negative pressure manufacturing device 2 uses the local vacuum and atmospheric pressure generated by the height difference of the liquid at both ends of the L-shaped tube 2-4 to form a negative pressure at the connection container 2-1. Since the connection container 2-1 is connected to the negative pressure chamber 1-1 below the leaching tank 1 through the negative pressure tube 1-6, the liquid in the negative pressure chamber 1-1 is filtered. After the liquid is extracted from the filter plate 1-2, it enters the connection container 2-1, the L-shaped tube 2-4, the water tank 2-5 in sequence along the negative pressure tube 1-6, and is finally discharged to the sedimentation tank 4 by the water pump 2-6.

[0128] The precious liquid pool 5 is located at the end of the sedimentation pool 4, and is mainly used to contain precious liquid and perform secondary sedimentation. A precious liquid submersible pump 5-1 is arranged in the precious liquid pool 5.

[0129] Combination Figure 6 The carbon adsorption device 6 includes a tank body with a top plate 6-5 at the upper end and a bottom plate 6-4 at the lower end. An upper sieve plate 6-9 and a lower sieve plate 6-8 are arranged in the tank body. The space between the upper sieve plate 6-9 and the lower sieve plate 6-8 is a carbon adsorption chamber 6-3, and the carbon adsorption chamber 6-3 is filled with activated carbon particles. There is a water outlet channel 6-7 between the top plate 6-5 and the upper sieve plate 6-9, and the water outlet channel 6-7 is connected to the water outlet pipe 6-2. There is a water inlet channel 6-6 between the bottom plate 6-4 and the lower sieve plate 6-8, and the water inlet channel 6-6 is connected to the water inlet pipe 6-1. Furthermore, one or two layers of cotton sail filter cloth are laid on the upper side of the bottom plate 6-4 and the lower side of the top plate 6-5 respectively to prevent carbon particles from passing through the sieve holes and being discharged, and also play a role in filtering and purifying water quality, further improving the carbon adsorption effect.

[0130] The carbon adsorption device 6 of this embodiment has five tanks, the outlet pipe 6-2 of the first tank is connected to the inlet pipe 6-1 of the adjacent second tank, and the inlet pipe 6-1 of the first tank is connected to the precious liquid submersible pump 5-1 through a pipeline. The outlet pipe 6-2 of the last carbon adsorption tank is connected to the lean liquid pool 7. The gold-containing precious liquid is supplied to the carbon adsorption device 6 through the precious liquid submersible pump 5-1, and the lean liquid is discharged into the lean liquid pool 7 through the outlet pipe 6-2 of the last tank, so as to realize the cyclic adsorption of gold.

[0131] The tank body is made of rolled steel plates and welded, and is cylindrical. The bottom plate 6-4 is welded to the tank body, and the top plate 6-5 is fastened with flanges, bolts, and rubber gaskets. Water channels and pipelines are left above and below the carbon adsorption tank to achieve liquid inlet and outlet. The diameter of the tank body is 1.0-2.0m, and the height is 1.5-2.5m. Multiple tanks can be set depending on the gold content of the precious liquid.

[0132] The lean liquid pool 7 is located on one side of the precious liquid pool 5, and its main functions are to contain lean liquid, sodium cyanide (or environmentally friendly gold extraction agent) and lime solution, place a submersible pump to supply lean liquid to the leaching pool, and place a submersible pump to fill water to the negative pressure manufacturing device. The lean liquid pool 7 is excavated on site, with a length of 12.5m, a width of 10.0m, and a depth of 5.0m. The side walls and bottom of the lean liquid pool 7 are cast with reinforced concrete, and a sodium cyanide or environmentally friendly gold extraction agent solution addition pipe 8 and a lime solution addition pipe 9 are arranged around it.

[0133] A lean liquid submersible pump 7-1 is provided in the lean liquid pool 7. The lean liquid submersible pump 7-1 is used to transport the lean liquid in the lean liquid pool 7 to the fluid inlet pipe 10-5.

[0134] The noble liquid pool 5 is located at the end of the sedimentation tank. The noble liquid pool 5 is excavated on site, and preferably has a length of 12.5 m, a width of 10.0 m, and a depth of 5.0 m. The side walls and bottom of the noble liquid pool 5 are cast with reinforced concrete, and the carbon adsorption device 6 is arranged above the noble liquid pool 5.

[0135] The production control method of the cyanidation gold extraction system of the present invention is as follows:

[0136] Step 1: Use an electric grab to load gold-bearing ore raw materials into the leaching tank 1, and use manual trimming and leveling of the surface layer. The gold-bearing ore raw materials are required to be filled at a height of 2.0m, and the surface layer forms a slope of about 1% from the front end to the end of the leaching tank 1.

[0137] Step 2: Inject lean solution into the leaching tank, requiring the lean solution to cover the highest point of the gold-containing ore raw material layer by more than 0.3m.

[0138] Step three: Start the negative pressure manufacturing device 2, and use an electric crane to hang the boiling pulping device 10 to perform boiling pulping in sections from the front end to the rear end of the leaching tank 1. During the process, the boiling pulping device 10 is first filled with high-pressure air through the fluid inlet pipe 10-5, and the electric crane hook slowly falls. Under the action of the counterweight block and high-pressure air, the pulping pipe 10-2 is inserted into the slurry layer to the bottom of the leaching tank 1. After the air is continuously filled for 10 minutes, the lean liquid is filled through the fluid inlet pipe 10-5 for 20 minutes. After completion, the electric crane hook is slowly lifted and moved forward to carry out the next stage of boiling pulping. Each section of gold-containing ore raw material is subjected to a continuous cycle of boiling pulping for 0.5 hours and standing soaking for 4.5 hours until the leaching time requirement is met.

[0139] The turbid liquid in the upper layer of the leaching tank flows by gravity into the feed barrel 3-3 of the sedimentation tank 3 through the overflow pipe 1-3. After the turbid liquid is purified in the sedimentation tank 3, the suspended matter gradually settles into the conical cylinder 3-2 by its own weight. When the concentration of the bottom flow suspended matter reaches more than 40%, it is discharged back to the leaching tank 1 through the bottom flow slurry pump 3-6. The upper clear liquid enters the overflow tank 3-4 and flows by gravity to the sedimentation tank 4 through the clear liquid overflow pipe 3-5 for subsequent treatment. When the boiling pulping operation causes the liquid level to be too high due to the addition of lean liquid, the excess turbid liquid in the upper layer of the leaching tank 1 is discharged from the overflow pipe 1-3 and flows by gravity into the sedimentation tank 3.

[0140] Step 4: After the boiling pulping operation in the leaching tank 1 is completed, the liquid is allowed to stand until the supernatant is completely clarified, and the valves 1-5 of the liquid discharge pipe are opened, and the supernatant is discharged into the sedimentation tank 4 by gravity.

[0141] After the gold-containing liquid is purified in the sedimentation tank 4 at four stages, it flows by gravity into the precious liquid tank 5. After the precious liquid is gold-recovered by the carbon adsorption device 6, the barren liquid is discharged into the barren liquid tank 7. Sodium cyanide (or environmentally friendly gold extraction agent) solution and lime solution are added to the barren liquid tank 7. After the required reagent concentration and pH value are restored, the barren liquid is fed into the leaching tank 1 and the boiling pulping device 10 through the barren liquid submersible pump 7-1 for recycling.

[0142] Step 5: After the above operations are completed, the cyanide residue (gold-containing ore after leaching) in the leaching pool is filtered through negative pressure for several hours, and most of the liquid inside is discharged through the negative pressure manufacturing device. When the overall moisture content reaches below 15%, the cyanide residue is taken out by an electric grab. The system enters the next cycle operation.

[0143] Among them, the specific control method of the negative pressure manufacturing device 2 is as follows:

[0144] Step (i): close the water tank drain pipe valve 2-5-4 and the water pump inlet pipe valve 2-6-2, and open the exhaust pipe valve 2-3-1, the air pressure connecting pipe valve 2-5-2 and the water supply pipe valve 2-2-1 in sequence, and add lean liquid to the L-shaped pipe 2-4 and the water tank 2-5 through the water supply pipe 2-2;

[0145] Step (ii): When the air pressure connecting pipe 2-5-1 starts to overflow, close the air pressure connecting pipe valve 2-5-2; when the exhaust pipe 2-3 starts to overflow, close the water supply pipe valve 2-2-1 and the exhaust pipe valve 2-3-1 in sequence;

[0146] The water replenishment operation into the L-shaped tube 2-4 and the water tank 2-5 is completed through step (1) and step (2);

[0147] Step (III): After the water replenishment is completed, the water pump 2-6 is started, the water pump inlet pipe valve 2-6-2 and the air pressure connecting pipe valve 2-5-2 are opened in sequence, and a vacuum negative pressure is formed inside the connection container 2-1. After the negative pressure pipe valve 1-7 is opened, the leaching tank 1 connected thereto begins to discharge the filtrate. Part of the liquid in the leaching tank 1 is drawn out through the filter plate 1-2, and then sequentially passes through the negative pressure pipe 1-6, the L-shaped pipe 2-4, the water tank 2-5, and finally discharged to the sedimentation tank 4 by the water pump 2-6.

[0148] During the negative pressure filtration operation, the liquid level meter 2-7 detects data and the controller timely adjusts the operating frequency of the variable frequency speed regulating motor to reasonably control the discharge volume of the water pump 2-6 to ensure that the liquid level in the water tank 2-5 is within a certain set range (for example, the liquid level in the water tank is not lower than the upper edge of the horizontal section of the L-shaped pipe and not lower than the upper edge of the water inlet pipe of the water pump), thereby obtaining a continuous and stable vacuum negative pressure effect.

[0149] Example

[0150] A gold mine originally used crushing, grinding and flotation beneficiation technology, and the tailings were discharged into the tailings pond for storage. As the price of gold continued to rise, the mine decided to recover the old tailings pond that had been closed and recover the residual gold in the tailings. The tailings in the tailings pond have a stock of 4 million tons, with an average gold grade of 0.9g / t. The mine plans to recover and utilize 600t / d of tailings, with an annual operation of 330 days, which can be recovered and utilized for 12 years. Since the tailings pond has been closed for a long time and the tailings are severely oxidized, the recovery rates of gravity separation and flotation processes are low; if the cyanide gold extraction process is used, the impact of tailings oxidation can be avoided, a higher recovery rate can be obtained, and the economic feasibility of recovering the tailings pond can be ensured. In view of this situation, the design institute commissioned by the mine used existing technology to design the gold extraction system. The main equipment to be selected is as follows: 2 4.0×4.5m slurry mixing barrels; 10 7.0×7.5m aerated mechanical stirring leaching tanks; 2 3060 vibrating screens; 1 32m thickener; 225m 25 diaphragm filter presses; 6 slurry pumps; 2 Roots blowers; 2 clean water pumps. The main operating parameters are as follows: leaching time 24h; leaching concentration 40%; sodium cyanide concentration 1‰; slurry pH 11-12. The laboratory conducted cyanide leaching tests on the ore samples of the mine, and the leaching rate was 90.2%, the washing rate was 88.1%, and the cyanide slag moisture content was 15%. According to the design institute's plan, the mine's cyanide gold extraction system is expected to cover an area of ​​11,000m 2 The estimated investment is RMB 60 million. According to the equipment to be selected, the energy consumption of the cyanide gold extraction system built by the mine using existing technology is about 24.63 kwh / t, and there are 50 operators and maintenance personnel.

[0151] In view of the above situation, the mine adopted the negative pressure suction filtration cyanidation gold extraction system of the present invention to replace the original design for tailings cyanidation gold extraction under confidentiality conditions. The specific parameters are as follows: 5 leaching tanks, located on the surface, 50m long, 5.0m wide, 3.0m high, the supporting negative pressure chamber is 50m long, 5.0m wide, 0.5m high, and the thickness of the gold tailings raw material layer in the leaching tank is 2.0m; the negative pressure manufacturing device is built using an idle shaft, the negative pressure auxiliary generating pipe model is 480×12mm seamless steel pipe, and the height difference from the top of the auxiliary pipe to the water tank liquid level is 30m; the sedimentation tank is made of galvanized canvas material, semi-underground construction, the cylindrical tube is 2.0m high, 15m in diameter, and round The cone has an angle of 60° and is supported by the ground after excavation, with space for the installation and operation of a slurry pump at the bottom. The sedimentation tank adopts a 4-stage sedimentation method and is constructed by surface excavation. Each sub-tank is 12.5m long, 5.0m wide and 5.0m deep. The precious liquid tank is constructed by surface excavation, with a length of 12.5m, a width of 10.0m and a depth of 5.0m. Five groups of carbon adsorption tanks are installed on the upper part. The lean liquid tank is constructed by surface excavation, with a length of 12.5m, a width of 10.0m and a depth of 5.0m. It is equipped with 6 submersible pumps. There are 5 groups of boiling slurry making devices.

[0152] 1.1 The number of leaching tanks is based on the formula:

[0153] Where G is the number of leaching pools, K is the surplus coefficient, which is 1.1; Q is the daily ore processing capacity, 1000 tons / day; t is the leaching time determined by the boiling slurry leaching test, 45h; a is the length of the leaching pool, 50m; b is the width of the leaching pool, 5m; c is the thickness of the gold-bearing tailings layer in the leaching pool, 2.0m; ρ is the bulk density of the tailings, 1.6t / m 3 .

[0154] Calculation results:

[0155] Based on the calculation results, the number of leaching tanks is determined to be five.

[0156] 1.2L-shaped tube diameter according to the formula:

[0157] Where φ is the diameter of the L-shaped tube, m; K0 is the surplus coefficient, which is 1.2; μ is the flow rate of the liquid in the L-shaped tube, which is designed to be 0.15 m / s; V is the filtrate output of the leaching pool determined by the negative pressure filtration experiment, 0.017 m 3 / s.

[0158] Calculation results:

[0159] According to the calculation results, the inner diameter of the L-shaped tube is determined to be 456mm, and it is made of 480×12mm standard seamless steel pipe.

[0160] 1.3 The height of the L-shaped tube is based on the formula: H = K1hP (ρ0 / ρ);

[0161] Wherein, the height difference from the lower edge of the exhaust pipe at the top of the HL-shaped tube to the highest liquid level in the water tank is m; K1-redundancy coefficient, taken as 1.2; h-the height of the clean water column that can be supported by ten standard atmospheric pressures, taken as 103.4m / Mpa; P-the vacuum degree required for the design of the leaching tank, 0.25Mpa; ρ0-clean water density, 1.00t / m 3 ;ρ-filtrate density, 1.02t / m 3 .

[0162] Calculation results: H = 1.2 × 103.4 × 0.25 × (1.00 / 1.02) = 30.41 m.

[0163] According to the calculation results, the height difference from the lower edge of the exhaust pipe at the top of the L-shaped pipe to the highest liquid level in the water tank is determined to be 30m.

[0164] 1.4 The diameter of the sedimentation tank is based on the formula:

[0165] Where φ is the diameter of the cylindrical tube of the sedimentation tank, m; K0 is the safety factor, which is 1.1; V1 is the turbid liquid output determined by the boiling pulping leaching test, 12.24m 3 / h; ρ1-density of turbid liquid, t / m 3 ; ρ1 = 100 / (C1 / ρ2+100-C1), where C1 is the mass concentration of the turbid liquid fed into the sedimentation tank, 10%; C2 is the mass concentration of the bottom flow slurry discharged from the sedimentation tank, 40%; ρ2 is the suspended matter density, 3.0t / m 3 ; Calculated ρ1 is 1.07t / m 3 ; S-mass of suspended solids treated per unit area of ​​the sedimentation tank per unit time, t / (m 2 .h); where S = V P / (R1-R2), where R1 is the liquid-to-solid ratio of the turbid liquid fed into the sedimentation tank when the concentration is C1, 9:1; R2 is the liquid-to-solid ratio of the underflow slurry discharged from the sedimentation tank when the concentration is C2, 3:2; VP - The average sedimentation velocity of suspended matter under the condition of turbid liquid settling to the required underflow concentration determined by sedimentation experiment is 0.0722m / h; S is calculated to be 0.00963t / (m 2 .h).

[0166] Calculation results:

[0167] According to the calculation results, the diameter of the cylindrical tube of the sedimentation tank is determined to be 15m.

[0168] The mine adopts the present invention to carry out cyanide gold extraction treatment on tailings in the tailings pond. According to statistics, the present invention is compared with the existing technology after construction and commissioning as follows: (1) The total investment of the system of the present invention is 12 million yuan, which reduces the investment cost by 80% compared with the existing technology; (2) The system of the present invention occupies an area of ​​5000m 2 , compared with the prior art, the floor space is reduced by 55%; (3) the energy consumption of the system of the present invention is 8.83kwh / t, which is 64% lower than that of the prior art; (4) the number of operators and maintenance personnel is reduced to 25, which reduces the labor cost by 50% compared with the prior art; (5) in terms of production indicators, the cyanide leaching rate reaches 90.5%, which is 0.3% higher than that of the prior art; the cyanide slag washing rate reaches 92.3%, which is 4.2% higher than that of the prior art; the water content of the cyanide slag is 12.2%, which is 2.8% lower than that of the prior art.

[0169] Although the present invention has been described in detail by reference to the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A negative pressure suction filtration type cyanide gold extraction system, comprising a sedimentation tank (3), a precipitation tank (4), a noble liquid tank (5), a carbon adsorption device (6) and a lean liquid tank (7), characterized in that: The system further comprises one or more leaching tanks (1) and boiling pulping devices (10) corresponding to the leaching tanks (1) one by one; the leaching tank (1) is provided with a drainage pipe (1-4) connected to the sedimentation tank (4) and an overflow pipe (1-3) connected to the settling tank (3); a negative pressure chamber (1-1) is provided below the leaching tank (1) through a filter plate (1-2); the system further comprises a negative pressure manufacturing device (2); the negative pressure manufacturing device (2) comprises a connection container (2- 1) and an L-shaped tube (2-4); the upper end of the connecting container (2-1) is connected to each negative pressure chamber (1-1) through a negative pressure tube (1-6), and the lower end is connected to the upper end of the L-shaped tube (2-4); the upper end of the L-shaped tube (2-4) is connected to a water supply pipe (2-2) and an exhaust pipe (2-3), and the lower end of the L-shaped tube (2-4) is connected to a water tank (2-5); the water tank (2-5) is connected to a water pump (2-6-1) driven by a variable frequency speed regulating motor 2-6); an air pressure connecting pipe (2-5-1) is installed at the upper end of the water tank (2-5); a liquid level meter (2-7) is also installed on the water tank (2-5) and is located above the air pressure connecting pipe (2-5-1) and is used to sense and measure the water level in the water tank (2-5); the negative pressure manufacturing device (2) also includes a controller for collecting water level data in the water tank (2-5) through the liquid level meter (2-7) and for controlling the variable frequency speed regulating motor; the system also includes a boiling pulping device ( 10); the boiling pulping device (10) comprises a water distribution tank (10-1), the bottom of which is connected to a plurality of pulping pipes (10-2), and one side of which is connected to a fluid inlet pipe (10-5), the end of which is used to connect to a lean liquid submersible pump (7-1), a clean water pump or an air compressor; a crane is provided above each leaching tank for loading and digging gold-containing ore and hanging the boiling pulping device (10) during the leaching process.

2. The negative pressure filtration type cyanide gold extraction system as claimed in claim 1, characterized in that The number of the leaching tanks (1) is determined by calculation according to Formula 1: Formula 1: Where G is the number of leaching tanks, pieces; K—redundancy coefficient, generally 1.1 to 1.2; Q—daily processing volume, tons / day; t—leaching time determined by boiling pulping leaching test, h; a—length of leaching tank, m; b—width of leaching tank, m; c—thickness of the gold-bearing ore layer in the leaching tank, m; ρ—ore bulk density, t / m 3 .

3. The negative pressure filtration type cyanide gold extraction system as claimed in claim 1, characterized in that The diameter and height of the L-shaped tube (2-4) are calculated and determined according to Formula 2 and Formula 3: Formula 2: Where φ is the diameter of L-shaped tube, m; K0—redundancy coefficient, generally 1.1 to 1.2; μ—the flow rate of liquid in the L-shaped tube, generally designed to be 0.1-0.2 m / s; V—The filtrate output of the leaching tank determined by the negative pressure filtration experiment, m 3 / s; Formula 3: H = K1hP (ρ0 / ρ); Wherein, the height difference between the lower edge of the exhaust pipe at the top of the H-L-shaped tube and the highest liquid level in the water tank is m; K1—Redundancy coefficient, generally 1.1 to 1.2; h—the height of a clean water column that can be supported by ten standard atmospheres, which is 103.4m / Mpa; P—vacuum degree required for leaching tank design, MPa; ρ0—Clean water density, t / m 3 ; ρ—filtrate density, t / m 3 .

4. The negative pressure filtration type cyanide gold extraction system according to claim 1, characterized in that: The upper part of the sedimentation tank (3) is a cylindrical cylinder (3-1) with an overflow trough (3-4) and a feed cylinder (3-3), and the lower part is a conical cylinder (3-2). The bottom end of the conical cylinder (3-2) is connected to an underflow slurry pump (3-6) through a discharge pipe, and the underflow slurry pump (3-6) is connected to each leaching tank (1) through a pipeline; the overflow trough (3-4) is connected to the sedimentation tank (4) through a clear liquid overflow pipe (3-5); and the feed cylinder (3-3) is connected to the discharge end of the overflow pipe (1-3).

5. The negative pressure filtration type cyanide gold extraction system as claimed in claim 4, characterized in that The diameter of the cylindrical barrel (3-1) is calculated and determined according to Formula 4: Formula 4: Where φ is the diameter of the cylindrical tube of the sedimentation tank, m; K0—safety factor, generally 1.1 to 1.2; V1—The turbid liquid yield determined by boiling pulping leaching test, m 3 / h; ρ1—density of turbid liquid, t / m 3 ; Where ρ1=100 / (C1 / ρ2+100-C1) C1—mass concentration of turbid liquid fed into the sedimentation tank, %; C2—mass concentration of bottom flow slurry discharged from the sedimentation tank, %; ρ2—suspended matter density, t / m 3 ; S—the mass of suspended solids treated per unit area of ​​the sedimentation tank per unit time, t / (m 2 .h); Where S = V P / (R1-R2); R1—liquid-to-solid ratio when the concentration of turbid liquid fed into the sedimentation tank is C1; R2—liquid-to-solid ratio when the concentration of underflow slurry discharged from the sedimentation tank is C2; V P —The average settling velocity of suspended matter when a turbid liquid settles to the required underflow concentration, determined by sedimentation experiments, in m / h.

6. The negative pressure filtration type cyanide gold extraction system according to claim 1, characterized in that: The lean liquid pool (7) is located at one side of the precious liquid pool (5); the lean liquid pool (7) is provided with a sodium cyanide or environmentally friendly gold extraction agent solution addition pipe (8) and a lime solution addition pipe (9); the lean liquid pool (7) is provided with a lean liquid submersible pump (7-1) for conveying the lean liquid in the lean liquid pool (7) to the fluid inlet pipe (10-5); the precious liquid pool (5) is located at the end of the sedimentation tank (4); the carbon adsorption device (6) is arranged above the precious liquid pool (5); the water pump (2-6) is connected to the sedimentation tank (4) through a water pump drainage pipe (2-6-3).

7. A control method for a negative pressure filtration type cyanidation gold extraction system according to any one of claims 1 to 6, characterized in that: Step 1: using an electric grab bucket to load gold-containing ore raw materials into the leaching tank (1) and trim and flatten them; Step 2: injecting lean solution into the leaching tank (1), requiring the lean solution to cover the gold-containing ore raw material layer; Step 3: start the negative pressure manufacturing device (2), and use an electric crane to hang the boiling pulping device (10) from the front end to the rear end of the leaching tank (1) to perform boiling pulping in sections; during the process, the boiling pulping device (10) is first filled with high-pressure air through the fluid inlet pipe (10-5), the electric crane hook is dropped, and the pulping pipe (10-2) is inserted into the gold ore raw material layer. After the air is continuously filled in the process, the lean liquid is filled in through the fluid inlet pipe (10-5); Step 4: After the boiling pulping operation in the leaching tank (1) is completed, the liquid is allowed to stand until the supernatant is completely clarified, and the valve of the discharge pipe (1-5) is opened, and the supernatant is discharged into the sedimentation tank (4) by gravity; Step 5: After the above operations are completed, the cyanide residue in the leaching tank is further discharged through negative pressure filtration; when the overall moisture content reaches below 15%, the cyanide residue is taken out using an electric grab.

8. The control method according to claim 7, characterized in that The specific control method of the negative pressure manufacturing device (2) is as follows: Step (1): close the water tank drain pipe valve (2-5-4) and the water pump inlet pipe valve (2-6-2), and open the exhaust pipe valve (2-3-1), the air pressure connecting pipe valve (2-5-2) and the water supply pipe valve (2-2-1) in sequence, and add lean liquid into the L-shaped pipe (2-4) and the water tank (2-5) through the water supply pipe (2-2); Step (ii): when the air pressure connecting pipe (2-5-1) begins to overflow, the air pressure connecting pipe valve (2-5-2) is closed; when the exhaust pipe (2-3) begins to overflow, the water supply pipe valve (2-2-1) and the exhaust pipe valve (2-3-1) are closed in sequence; Step (iii): after the water replenishment is completed, the water pump (2-6) is started in sequence, the water pump water inlet pipe valve (2-6-2) and the air pressure connecting pipe valve (2-5-2) are opened, and part of the liquid in the leaching tank (1) is extracted through the filter plate (1-2), and then sequentially discharged to the sedimentation tank (4) through the negative pressure pipe (1-6), the L-shaped pipe (2-4), and the water tank (2-5) by the water pump (2-6); During the negative pressure filtration operation, the liquid level (2-7) detection data and the controller are used to timely adjust the operating frequency, control the drainage volume of the water pump (2-6), and ensure that the liquid level in the water tank (2-5) is within the set range, thereby obtaining a continuous and stable vacuum negative pressure effect.

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