A biological hydrometallurgical pilot plant flow line device

Abstract

The utility model belongs to the hydrometallurgy process technical field, concretely relates to a biological hydrometallurgy pilot production assembly line device, and the complete set of device function covers all functions such as ore feeding, biological oxidation, solid-liquid separation, biological oxidation slag washing, waste liquid treatment, and plays an important role in biological oxidation pilot experiment. The oxidation reaction unit of the utility model includes a plurality of reaction kettles which are sequentially connected from high to low, can carry out oxidation reaction gradually, help to improve reaction efficiency, and meet the requirements of different types of ore liquid oxidation reaction. The reaction kettle is provided with a vertical stirring device, the bottom of the reaction kettle is provided with a perforated air supply coil pipe, the air holes of the perforated air supply coil pipe are arranged downward, the perforated air supply coil pipe is connected with an air supply system respectively, the vertical stirring device and the perforated air supply coil pipe stir ore liquid together, avoid ore slurry precipitation, and can send sufficient oxygen at the same time, guarantee oxidation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of hydrometallurgical process technology, specifically relating to a pilot production line device for biohydrometallurgical processes. Background Technology

[0002] Bio-oxidation technology, using microorganisms as the core carrier, has developed rapidly in the pretreatment of refractory gold concentrates in recent decades and has been successfully and widely applied in industry, becoming a new generation of pretreatment processes. It has also opened up new technologies and directions for the development and utilization of high-grade sulfide mineral resources. Today, with my country's mineral resources becoming increasingly scarce and complex, and environmental issues receiving increasing attention, there is an urgent need to research and develop new technologies and processes that are competitive in the market, protect the Earth's environment and ecological balance, and conform to the sustainable development strategy. Biotechnology is one of the most promising new technologies in this field.

[0003] Pilot-scale bio-oxidation experiments are of significant verification and guiding importance for scaling up small-scale optimization experiments into industrial applications. While substantial progress has been made in the research of small-scale bio-oxidation reactors, efficient and convenient equipment is lacking in the field of pilot-scale bio-oxidation experiments. Therefore, this patent project primarily focuses on developing an efficient and convenient equipment system for pilot-scale bio-oxidation, aiming to promote the development of this field. The following issues currently exist: (1) In the field of pilot-scale biological oxidation, there is a lack of continuous scale-up reaction equipment (including a complete set of production line treatment equipment such as a high-gradient continuous stirring reactor, a slurry solid-liquid separation thickening device, and a biological oxidation acidic waste liquid treatment device). Therefore, when scaling up the optimal process in the pilot test, there is an urgent need for a high-efficiency medium-sized reactor that can meet the requirements of sufficient stirring, constant temperature control and oxygen supply, and verify the stability of the conditions.

[0004] (2) Large stirred tanks are limited by factors such as rotation speed and stirring power, and the slurry is prone to sedimentation, resulting in insufficient reaction. Utility Model Content

[0005] The purpose of this invention is to provide a pilot-scale biohydrometallurgical production line device. This device includes a feed tank, an oxidation reaction unit, a thickener, a neutralization reaction unit, and a filter press, enabling it to perform all functions such as ore feeding, bio-oxidation, solid-liquid separation, bio-oxidation slag washing, and wastewater treatment. Furthermore, the reactor can be simultaneously stirred using a vertical stirring device and a perforated gas supply coil, effectively preventing slurry sedimentation. The reactor also features an electric heating unit to meet the requirements of different oxidation reaction temperatures and various reaction conditions.

[0006] The technical problem to be solved by this utility model is achieved by the following technical solution: a pilot production line device for biohydrometallurgy, comprising a main frame, a gas supply system, an electric heating unit and a control unit; The main frame is provided with a feed trough, an oxidation reaction unit, a thickener, a neutralization reaction unit, and a filter press arranged in descending order from high to low. The feed trough, oxidation reaction unit, thickener, neutralization reaction unit, and filter press are connected in sequence. The oxidation reaction unit includes multiple reaction vessels connected in series from high to low. Each reaction vessel is equipped with a vertical stirring device and a perforated gas supply coil at the bottom of the reaction vessel with the vents facing downwards. Considering the high concentration of slurry in the reaction vessel, it is difficult to avoid slurry deposition at the lower position of the reaction vessel, especially near the bottom. Therefore, the perforated gas supply coil is located at the very bottom of the reaction vessel with the vents facing downwards, which can fully stir the slurry at the bottom while preventing slurry deposition that could block the vents. The neutralization reaction unit includes two or more neutralization tanks connected in series from high to low, and the neutralization tanks are equipped with a stirring device. The vertical stirring device includes a stirring shaft and stirring blades disposed on the stirring shaft; The perforated gas supply coils are connected to the gas supply system. The reactor is equipped with an electric heating unit; The control unit is connected to the vertical stirring device, the air supply system, and the electric heating unit, respectively, and is used to control the stirring speed of the vertical stirring device, the air supply flow rate of the air supply system, and the heating temperature of the electric heating unit.

[0007] In a preferred embodiment of this invention, the electric heating unit includes a heating jacket, an electric heating rod, and a temperature sensing probe. The heating jacket is located outside the reactor, and a heat-conducting liquid is placed inside the heating jacket. The electric heating rod and the temperature sensing probe are respectively inserted into the heating jacket. The electric heating rod and temperature sensor probe are respectively connected to the control unit. By placing a heat-conducting liquid inside the heating jacket and heating the liquid with the electric heating rod, uniform heating of the reactor can be achieved. The control unit can compare the temperature value detected by the temperature sensor probe with a preset temperature, thereby controlling the start and stop of the electric heating rod to ensure that the microorganisms in the reactor undergo oxidation within the set temperature range, thus guaranteeing oxidation efficiency.

[0008] In a preferred embodiment of this invention, the electric heating unit further includes a heat-conducting liquid supply tank, which is positioned above the heating jacket. The thermally conductive liquid replenishment tank is connected to the heating jacket via a conduit. Because the thermally conductive liquid level may drop due to evaporation or leakage after prolonged reaction, the replenishment tank is used to replenish the thermally conductive liquid in the heating jacket in a timely manner to ensure heating efficiency. To save energy, the thermally conductive liquid replenishment tank is positioned higher than the heating jacket, and gravity is used to deliver the liquid from the replenishment tank into the heating jacket.

[0009] Preferably, in this invention, two electric heating rods are symmetrically arranged within the heating jacket along the axis of the reactor. Simultaneous heating using two electric heating rods symmetrically arranged within the heating jacket along the reactor axis results in faster heating and more uniform heating of the heat-conducting liquid.

[0010] In a preferred embodiment of this invention, the gas supply system includes an air compressor, an air filling pipe, and a flow meter; The air compressor is connected to the perforated air supply coil via an air filling pipe, and the flow meter is installed on the air filling pipe. The air compressor pressurizes the air and then sends it into the reaction vessel through the perforated air supply coil, enhancing the stirring effect while providing oxygen for the oxidation reaction.

[0011] Preferably, in this invention, the air inflator is detachably installed at the inlet end of the perforated air supply coil; to address the potential problem of the air inflator being blocked by slag, the air inflator is designed to be quick-detachable for easy disassembly and cleaning. The perforated gas supply coil is detachably installed inside the reactor. This detachable installation facilitates the cleaning of slag inside the coil after long-term use.

[0012] Preferably, each of the aforementioned reactors is equipped with a separate air compressor, which facilitates the control of gas flow rate according to the reaction efficiency requirements of different reactors; and can ensure a higher gas flow rate, resulting in a better aeration and stirring effect.

[0013] In a preferred embodiment of this invention, the stirring blades are slidably mounted on the stirring shaft. The stirring blades are fixed to the stirring shaft by bolts; The shape and size of the stirring blades are changed according to the slurry concentration and mineral properties to meet the requirements of different reaction conditions.

[0014] Preferably, the stirring blades of this invention are made of 316 stainless steel or nylon. 316 stainless steel or nylon has excellent corrosion resistance and wear resistance, thus improving the service life of the stirring blades.

[0015] In a preferred embodiment of this invention, the neutralization tank cover is provided with a waste liquid treatment agent addition port, and the waste liquid overflowing from the thickener enters the edge of the stirring blade of the neutralization tank through a conduit, in order to improve the mixing effect of the alkaline treatment agent and the acidic waste liquid.

[0016] Compared with the prior art, the beneficial effects of this utility model are: The biohydrometallurgical pilot production line of this invention consists of a feed trough, an oxidation reaction unit, a thickener, a neutralization reaction unit, and a filter press arranged sequentially from high to low on the main frame. The overflow liquid is fed into the next stage of the reaction equipment by gravity, thus saving energy.

[0017] The oxidation reaction unit of this invention includes multiple reaction vessels connected in series from high to low, performing oxidation reactions step by step, which helps to improve reaction efficiency and meet the requirements of oxidation reactions of different types of mineral liquids. Each reaction vessel is equipped with a vertical stirring device, and a perforated gas supply coil is installed at the bottom of the reaction vessel with the vents facing downwards. The perforated gas supply coil is connected to the gas supply system. The vertical stirring device and the perforated gas supply coil work together to stir the mineral liquid, preventing sedimentation and ensuring sufficient oxygen supply to guarantee oxidation efficiency. The reaction vessel is also equipped with an electric heating unit to provide the necessary temperature environment for the oxidation reaction.

[0018] The neutralization reaction unit includes two or more neutralization tanks connected in series from high to low, which neutralize the waste liquid step by step to ensure that the waste liquid is fully neutralized and meets the requirements of waste liquid treatment.

[0019] This invention utilizes a control unit to control the stirring speed of the vertical stirring device, the gas supply flow rate of the gas supply system, and the heating temperature of the electric heating unit to meet different reaction requirements. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the biohydrometallurgical pilot production line device described in this embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the reaction vessel described in an embodiment of the present invention; Figure 3 This is a schematic diagram of the perforated gas supply coil described in an embodiment of the present invention; In the diagram, 1 is the main frame, 2 is the feed trough, 3 is the oxidation reaction unit, 4 is the thickener, 5 is the neutralization reaction unit, and 6 is the filter press. 7. Reactor; 8. Vertical stirring device; 9. Perforated gas supply coil; 10. Neutralization tank; 81. Stirring shaft; 82. Stirring blades; 71 Heating jacket, 72 Electric heating rod, 73 Thermal liquid supply tank; 11 Air compressor, 12 Inflation hose. Detailed Implementation

[0021] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0022] like Figures 1-3 As shown, a pilot production line device for biohydrometallurgy includes a main frame 1, a gas supply system, an electric heating unit, and a control unit.

[0023] The main frame 1 is equipped with, from highest to lowest, a feed trough 2, an oxidation reaction unit 3, a thickener 4, a neutralization reaction unit 5, and a filter press 6. These components are connected sequentially via flexible hoses, allowing liquid to flow from the top into the next device under gravity. The main frame 1 is constructed of welded steel pipes, providing high strength to support the weight of each device.

[0024] In this embodiment, the solid-liquid separation unit includes a thickener and its related connecting devices. The slurry flowing out of the reactor 7 enters the thickener 4. The bottom of the thickener 4 discharges bio-oxidation residue for subsequent leaching reaction. The upper part of the thickener 4 discharges excess bio-oxidation liquid, which enters the neutralization tank 10 through a hose for subsequent neutralization treatment.

[0025] The oxidation reaction unit 3, as the main reaction unit, includes multiple reactors 7 arranged in series from high to low. Depending on the needs, 3-7 reactors 7 can be set; in this embodiment, three reactors 7 are included. Each reactor 7 is equipped with a vertical stirring device 8, and a perforated gas supply coil 9 is installed at the bottom of each reactor 7, with the gas holes of the perforated gas supply coil 9 facing downwards. The gas holes are evenly distributed along the pipe axis of the perforated gas supply coil 9, which is formed by bending a steel pipe.

[0026] The neutralization reaction unit 5, serving as a waste liquid treatment unit, includes two or more neutralization tanks 10 connected in series from high to low. Each neutralization tank 10 is equipped with a stirring device. In this embodiment, two neutralization tanks 10 are included. After the reaction is completed, the neutralized liquid flows out from the overflow port of the neutralization tank.

[0027] The vertical stirring device 8 includes a stirring shaft 81 and stirring blades 82 disposed on the stirring shaft.

[0028] The perforated gas supply coil 9 is connected to the gas supply system, which is an oxygen supply unit.

[0029] The reactor 7 is equipped with an electric heating unit, which is used to heat the reactor 7 to provide the temperature required for the oxidation reaction.

[0030] The control unit is connected to the vertical stirring device 8, the air supply system and the electric heating unit respectively, and is used to control the stirring speed of the vertical stirring device 8, the air supply flow rate of the air supply system and the heating temperature of the electric heating unit.

[0031] The electric heating unit includes a heating jacket 71, an electric heating rod 72, and a temperature sensing probe.

[0032] The heating jacket 71 is disposed outside the reactor 7, and a heat-conducting liquid is disposed inside the heating jacket 71. The electric heating rod 72 and the temperature sensing probe are vertically inserted into the heating jacket 71. In this embodiment, water is used as the heat-conducting liquid.

[0033] The electric heating rod 72 and the temperature sensing probe are respectively connected to the control unit.

[0034] The electric heating unit also includes a heat-conducting liquid supply tank 73, which is positioned above the heating jacket 71.

[0035] The heat-conducting liquid supply tank 73 is connected to the heating jacket 71 via a conduit. Specifically, during operation, the water level in the heat-conducting liquid supply tank 73 is always kept above the specified scale line to compensate for the amount of water evaporation caused by the heating jacket 71 during the heating process in the test.

[0036] Two electric heating rods 72 are symmetrically arranged in the heating jacket 71 along the axis of the reactor 7.

[0037] The air supply system includes an air compressor 11, an air filling pipe 12, and a flow meter.

[0038] The air compressor 11 is connected to the perforated air supply coil 9 via an air filling pipe 12, and the flow meter is installed on the air filling pipe 12.

[0039] The air inlet pipe 12 is detachably installed at the inlet end of the perforated air supply coil 9.

[0040] The perforated gas supply coil 9 is detachably installed inside the reactor 7. Specifically, an intermediate connecting pipe is provided above the perforated gas supply coil 9, and the intermediate connecting pipe is quickly connected to the reactor cover of the reactor 7 by a clamp. The gas filling pipe 12 is connected to the intermediate connecting pipe.

[0041] Each of the aforementioned reactors 7 is equipped with a separate air compressor 11.

[0042] The stirring blades 82 are slidably mounted on the stirring shaft 81. In this embodiment, two stirring blades 82 are mounted on the stirring shaft 81.

[0043] The stirring blade 82 is fixed to the stirring shaft 81 by bolts.

[0044] The shape and size of the stirring blades 82 are changed according to the slurry concentration and mineral properties.

[0045] The stirring blade 82 is made of 316 stainless steel or nylon.

[0046] The neutralization tank 10 is provided with a waste liquid treatment agent addition port on the top cover. The waste liquid overflowing from the thickener 4 enters the edge of the stirring blade of the neutralization tank 10 through a conduit.

[0047] This embodiment constructs a complete pilot-scale biological oxidation experimental system. The pilot-scale biological oxidation reaction device includes a heating unit, an oxygen supply unit, a main reaction unit, and a solid-liquid separation unit, which can meet the needs of conventional pilot-scale experiments, with a daily processing capacity of 100 kg / day. It can efficiently carry out the main biological oxidation reaction, as well as subsequent processes such as solid-liquid separation of slurry and wastewater treatment.

[0048] The aforementioned device can be applied to pilot-scale experiments exploring the bioleaching reaction of arsenic-sulfur minerals, such as gold concentrate encapsulated in sulfide minerals, and various types of sulfide minerals containing both arsenic and sulfur. It is particularly suitable for gold concentrate encapsulated in sulfides. This complete equipment system comprehensively covers all functions including ore feeding, bio-oxidation, solid-liquid separation, bio-oxidation slag washing, and wastewater treatment, playing a crucial role in pilot-scale bio-oxidation experiments.

Claims

1. A pilot-scale biohydrometallurgical production line device, characterized in that: Includes the main frame (1), gas supply system, electric heating unit and control unit; The main frame (1) is provided with a feed tank (2), an oxidation reaction unit (3), a thickener (4), a neutralization reaction unit (5), and a filter press (6) arranged in sequence from high to low. The feed tank (2), oxidation reaction unit (3), thickener (4), neutralization reaction unit (5), and filter press (6) are connected in sequence. The oxidation reaction unit (3) includes multiple reaction vessels (7) arranged in series from high to low. Each reaction vessel (7) is equipped with a vertical stirring device (8). A perforated gas supply coil (9) is provided at the bottom of the reaction vessel (7), with the gas holes of the perforated gas supply coil (9) facing downwards. The neutralization reaction unit (5) includes two or more neutralization tanks (10) arranged in series from high to low, and the neutralization tanks (10) are equipped with a stirring device; The vertical stirring device (8) includes a stirring shaft (81) and stirring blades (82) disposed on the stirring shaft. The perforated gas supply coil (9) is connected to the gas supply system. The reactor (7) is equipped with an electric heating unit; The control unit is connected to the vertical stirring device (8), the gas supply system and the electric heating unit respectively, and is used to control the stirring speed of the vertical stirring device (8), the gas supply flow rate of the gas supply system and the heating temperature of the electric heating unit.

2. The pilot-scale biohydrometallurgical production line according to claim 1, characterized in that: The electric heating unit includes a heating jacket (71), an electric heating rod (72), and a temperature sensing probe; The heating jacket (71) is located outside the reactor (7), and a heat-conducting liquid is provided inside the heating jacket (71). The electric heating rod (72) and the temperature sensing probe are respectively inserted into the heating jacket (71). The electric heating rod (72) and the temperature sensing probe are respectively connected to the control unit.

3. The pilot-scale biohydrometallurgical production line according to claim 2, characterized in that: The electric heating unit also includes a heat-conducting liquid supply tank (73), which is positioned above the heating jacket (71); The heat-conducting liquid supply tank (73) is connected to the heating jacket (71) via a conduit.

4. The pilot-scale biohydrometallurgical production line according to claim 2, characterized in that: Two electric heating rods (72) are symmetrically arranged in the heating jacket (71) along the axis of the reactor (7).

5. The pilot-scale biohydrometallurgical production line according to claim 1, characterized in that: The air supply system includes an air compressor (11), an air filling pipe (12), and a flow meter; The air compressor (11) is connected to the perforated air supply coil (9) via an air filling pipe (12), and the flow meter is installed on the air filling pipe (12).

6. The pilot-scale biohydrometallurgical production line according to claim 5, characterized in that: The air inlet pipe (12) is detachably installed at the inlet end of the perforated air supply coil (9); The perforated gas supply coil (9) is detachably installed inside the reactor (7).

7. The pilot-scale biohydrometallurgical production line according to claim 5, characterized in that: Each of the aforementioned reactors (7) is equipped with a separate air compressor (11).

8. The pilot-scale biohydrometallurgical production line according to claim 1, characterized in that: The stirring blades (82) are slidably mounted on the stirring shaft (81); The stirring blades (82) are fixed to the stirring shaft (81) by bolts; The shape and size of the stirring blades (82) are changed according to the slurry concentration and mineral properties.

9. The pilot-scale biohydrometallurgical production line according to claim 1, characterized in that: The stirring blade (82) is made of 316 stainless steel or nylon.

10. The pilot-scale biohydrometallurgical production line according to claim 1, characterized in that: The neutralization tank (10) is provided with a waste liquid treatment agent addition port on the top cover. The waste liquid overflowing from the thickener (4) enters the edge of the stirring blade of the neutralization tank (10) through the conduit.

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