A device for roasting and leaching of sulphide ore by concentrated sulphuric acid under micro-negative pressure and its using method

Abstract

The application discloses a sulfide ore micro-negative pressure concentrated sulfuric acid roasting and leaching device and a use method, relates to the field of hydrometallurgy production equipment, and comprises a jacketed reaction kettle, a dissolving tank, a jacketed heating device, a jacketed tail gas pipe, a desulfurization tower, a tail gas treatment device and a tail gas discharge pipe; the tail gas treatment device comprises an ejector and a tail gas absorption tank; a discharge port of the jacketed reaction kettle is connected to a feed inlet of the dissolving tank through a pipeline, an air outlet of the jacketed reaction kettle is connected to an air inlet of the desulfurization tower through the jacketed tail gas pipe, and an air outlet of the desulfurization tower and an air outlet of the dissolving tank are connected to a suction inlet of the ejector in a pipeline confluence mode. The application can make the sulfide ore leaching process be carried out under micro-negative pressure conditions, the adopted equipment has no high requirement on pressure resistance, the manufacturing cost is low, and the safety hidden danger of explosion caused by excessive pressure in the equipment can be eliminated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydrometallurgical production equipment, in particular to a sulfide ore micro-negative pressure concentrated sulfuric acid roasting leaching device and a use method thereof. BACKGROUND

[0002] The current mainstream process of sulfide ore hydrometallurgical leaching is "oxygen pressure leaching", and the supporting equipment includes oxygen pressure kettle, buffer tank, flash tank, adjusting tank and the like. The system has a high requirement for the pressure resistance performance of the equipment, the main investment is large, and there are safety hazards. There have been many accidents of oxygen pressure kettle explosion leading to personnel casualties in the industry.

[0003] To solve the above problems, the present application provides a combination of equipment suitable for sulfide ore feeding, roasting leaching, slurry dissolution, sulfur blocking and tail gas absorption, so as to realize safe and efficient leaching of sulfide ore under micro-negative pressure condition. SUMMARY

[0004] The present application aims to solve the above technical problems, and provides a sulfide ore micro-negative pressure concentrated sulfuric acid roasting leaching device with low manufacturing cost and maintenance cost, safe and efficient leaching.

[0005] The technical scheme of the present application is as follows:

[0006] A sulfide ore micro-negative pressure concentrated sulfuric acid roasting leaching device, comprising a jacketed reaction kettle, a dissolution tank, a jacketed heating device, a jacketed tail gas pipe, a desulfurization tower, a tail gas treatment device, and a tail gas discharge pipe.

[0007] The tail gas treatment device comprises an ejector and a tail gas absorption tank, the ejector is provided with an ejector air inlet, an ejector liquid inlet and an ejector liquid outlet, the ejector liquid outlet is connected with the tail gas absorption tank, the tail gas absorption tank is provided with a liquid inlet, a liquid outlet and a gas outlet, the liquid inlet of the tail gas absorption tank is communicated with the ejector liquid outlet, the tail gas absorption tank liquid outlet is connected with a first circulating pump, the first circulating pump is communicated with the ejector liquid inlet through a pipeline, and the tail gas absorption tank gas outlet is communicated with the tail gas discharge pipe.

[0008] The top of the jacketed reaction kettle and the dissolution tank is provided with a feed inlet and a gas outlet, and the bottom is provided with a discharge outlet; the side wall of the desulfurization tower is provided with an air inlet, the top is provided with a gas outlet, and the bottom is provided with a blowdown port.

[0009] The discharge outlet of the jacketed reaction kettle is connected to the feed inlet of the dissolution tank through a pipeline, the gas outlet of the jacketed reaction kettle is connected to the air inlet of the desulfurization tower through the jacketed tail gas pipe, and the gas outlet of the desulfurization tower and the gas outlet of the dissolution tank are communicated to the ejector air inlet through a pipeline.

[0010] Further, the outer surfaces of the jacketed reaction kettle and the jacketed tail gas pipe are provided with jackets; the jacket heating device comprises a heat conducting oil furnace and a heat conducting oil storage tank, the outlet of the heat conducting oil storage tank is communicated with the inlet of the heat conducting oil furnace through a heat conducting oil pump, the outlet of the heat conducting oil furnace is communicated with the jacket inlet of the jacketed reaction kettle through a pipeline, the jacket outlet of the jacketed reaction kettle is communicated with the jacket inlet of the jacketed tail gas pipe through a pipeline, and the jacket outlet of the jacketed tail gas pipe is communicated with the inlet of the heat conducting oil storage tank through a pipeline.

[0011] Further, the jacketed tail gas pipe is arranged at an inclination angle of 5°-85° with respect to the horizontal plane.

[0012] Further, a shredder and a vacuum feeding machine are further included, the shredder is used for crushing the agglomerated part of the sulfide ore powder, and then the vacuum feeding machine is used for feeding the sulfide ore powder into the feed inlet of the jacketed reaction kettle.

[0013] Further, the tail gas treatment device is arranged in two groups, and the gas outlet of the tail gas absorption tank of the first group of tail gas treatment devices is communicated with the suction inlet of the ejector of the second group of tail gas treatment devices.

[0014] Further, the tail gas treatment device further comprises an absorption liquid preparation tank, the liquid outlet of the absorption liquid preparation tank is connected with one end of a conveying pump through a pipeline, the top of the tail gas absorption tank is provided with a liquid supplementing port, and the other end of the conveying pump is communicated with the liquid supplementing port of the tail gas absorption tank through a pipeline.

[0015] Further, the desulfurization tower is a vertical structure and is composed of a spraying section, a liquid storage section and a sand settling section from top to bottom, the gas inlet of the desulfurization tower is arranged through the lower outer wall of the spraying section, the gas outlet of the desulfurization tower is arranged through the top outer wall of the spraying section, the spraying head is arranged at a position below the gas outlet at the top of the desulfurization tower, the liquid outlet is arranged through the lower outer wall of the liquid storage section, one end of the second circulating pump is communicated with the liquid outlet through a pipeline, and the other end of the second circulating pump is communicated with the spraying head through a pipeline; the bottom of the sand settling section is communicated with a blowdown valve.

[0016] Further, the jacketed reaction kettle, the dissolving tank, the desulfurization tower and the tail gas treatment device are all sealed devices.

[0017] The application further provides a use method of the sulfide ore micro-negative pressure concentrated sulfuric acid roasting and leaching device.

[0018] Step 1, providing the sulfide ore micro-negative pressure concentrated sulfuric acid roasting and leaching device of the application;

[0019] Step 2, feeding: the sulfide ore powder is sent into the shredder hopper through hoisting equipment, the agglomerated part is crushed, the vacuum feeding machine is used for feeding into the jacketed reaction kettle, the feeding is completed, and the feed valve is closed.

[0020] Step 3, leaching, dissolution: open the first circulating pump of the tail gas absorption tank, keep the jacketed reaction kettle, the dissolution tank and the desulfurization tower in a micro-negative pressure state by the action of the ejector, open the heat conduction oil furnace to heat the jacketed reaction kettle and the jacketed tail gas pipe, open the agitator of the jacketed reaction kettle, add the leaching agent, and after the reaction is completed, unload the material into the dissolution tank;

[0021] Step 4, sulfur blocking: when the reaction in the jacketed reaction kettle starts, open the second circulating pump in the desulfurization tower, the tail gas generated in the kettle enters the desulfurization tower through the jacketed tail gas pipe, and the spray liquid at the top of the tower cools the sulfur vapor in the tail gas into solid, achieving sulfur vapor interception and gathering in the sand settling section of the desulfurization tower;

[0022] Step 5, tail gas absorption: the tail gas after removing the sulfur vapor continues to enter the tail gas absorption tank for purification, and is discharged after meeting the relevant national standards.

[0023] Due to the adoption of the above technical scheme, the application has the following beneficial effects:

[0024] The application adopts the combination of a shredder, a vacuum feeding machine, a jacketed reaction kettle, a heat conduction oil furnace, a desulfurization tower, an ejector and a tail gas absorption tank, wherein the jacketed reaction kettle, the dissolution tank, the desulfurization tower and the tail gas absorption tank form a closed space during the reaction, the generated gas is introduced into the tail gas absorption tank by the ejector, safe and efficient leaching of the sulfide ore under micro-negative pressure conditions can be achieved, the whole process is carried out under micro-negative pressure conditions, the pressure resistance of the equipment does not need to be too high, the manufacturing cost is low, and the safety hazard of explosion caused by excessive pressure in the equipment can be eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 The figure is a structural schematic diagram of an embodiment of the application;

[0026] Fig. 2 The figure is a structural schematic diagram of a desulfurization tower in an embodiment of the application;

[0027] Fig. 3 The figure is a structural schematic diagram of a tail gas treatment device in an embodiment of the application.

[0028] Figs. 1-3 The reference numerals in the figure are as follows: 1, shredder; 2, vacuum feeding machine; 3, jacketed reaction kettle; 4, dissolution tank; 5, heat conduction oil furnace; 6, heat conduction oil storage tank; 7, jacketed tail gas pipe; 8, desulfurization tower; 81, spray section; 82, liquid storage section; 83, sand settling section; 84, spray head; 85, second circulating pump; 9, tail gas absorption tank; 91, first circulating pump; 10, ejector; 101, suction port of the ejector; 102, liquid inlet of the ejector; 103, liquid outlet of the ejector; 11, tail gas discharge pipe; 12, absorption liquid preparation tank. DETAILED DESCRIPTION

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figs. 1-3 As shown, a sulfide ore micro-negative pressure concentrated sulfuric acid roasting and leaching device includes a jacketed reactor 3, a dissolving tank 4, a jacketed heating device, a jacketed tail gas pipe 7, a desulfurization tower 8, a tail gas treatment device, and a tail gas emission pipe 11.

[0031] The exhaust gas treatment device includes an injector 10 and an exhaust gas absorption tank 9. The injector 10 is provided with an injector air intake 101, an injector liquid inlet 102 and an injector liquid outlet 103. The injector liquid outlet 103 is connected to the exhaust gas absorption tank 9. The exhaust gas absorption tank 9 is provided with a liquid inlet, a liquid outlet and an air outlet. The liquid inlet of the exhaust gas absorption tank 9 is connected to the injector liquid outlet 103. The liquid outlet of the exhaust gas absorption tank 9 is connected to a first circulation pump 91. The first circulation pump 91 is connected to the injector liquid inlet 102 through a pipe. The air outlet of the exhaust gas absorption tank 9 is connected to the exhaust gas discharge pipe 11.

[0032] The jacketed reactor 3 and the dissolving tank 4 are both equipped with a feed inlet and a gas outlet at the top, and a discharge outlet at the bottom; the desulfurization tower 8 has a gas inlet on the side wall, a gas outlet at the top, and a sewage outlet at the bottom.

[0033] The outlet of the jacketed reactor 3 is connected to the inlet of the dissolving tank 4 through a pipeline. The outlet of the jacketed reactor 3 is connected to the inlet of the desulfurization tower 8 through the jacketed tail gas pipe 7. The outlet of the desulfurization tower 8 and the outlet of the dissolving tank 4 are connected to the injector suction port 101 through a pipeline.

[0034] The leaching reaction is completed in the jacketed reactor 3. The dissolving tank 4 is used to dissolve and dilute the high-concentration material released from the reactor. Both processes generate gas pressure. In this embodiment, the jacketed reactor 3, dissolving tank 4, desulfurization tower 8, and tail gas treatment device are all sealed devices, forming a single enclosed space during the reaction. All gases are introduced into the tail gas absorption tank 9 by the ejector 10, purified, and then discharged through the tail gas discharge pipe 11. The tail gas absorption tank 9 contains alkaline solutions, such as liquid alkali, soda ash solution, and lime slurry. After the first circulation pump 91 is started, a high-speed liquid flow is generated to form a negative pressure, drawing away the gas inside the equipment. The airflow direction is: a. Jacketed reactor 3 → Jacketed tail gas pipe 7 → Desulfurization tower 8 → Ejector 10 → Tail gas absorption tank 9 → Tail gas discharge pipe 11; b. Dissolving tank 4 → Ejector 10 → Tail gas absorption tank 9 → Tail gas discharge pipe 11. The degree of negative pressure inside the equipment can be controlled by the frequency conversion adjustment of the first circulation pump 91.

[0035] The outer surface of the jacketed reaction kettle 3 and the jacketed tail gas pipe 7 is provided with a jacket; the jacket heating device comprises a heat conducting oil furnace 5 and a heat conducting oil storage tank 6, the oil outlet of the heat conducting oil storage tank 6 is communicated with the oil inlet of the heat conducting oil furnace 5 through a heat conducting oil pump, the oil outlet of the heat conducting oil furnace 5 is communicated with the jacket inlet of the jacketed reaction kettle 3 through a pipeline, the jacket outlet of the jacketed reaction kettle 3 is communicated with the jacket inlet of the jacketed tail gas pipe 7 through a pipeline, and the jacket outlet of the jacketed tail gas pipe 7 is communicated with the oil inlet of the heat conducting oil storage tank 6 through a pipeline.

[0036] The heat conducting oil furnace 5 is used for heating the heat conducting oil, and the heat conducting oil storage tank 6 is used for heat conducting oil storage and oil gas separation: the heat conducting oil is heated, the volume will expand, and the expansion coefficient is relatively large, so a storage tank is needed to accommodate the expanded volume in the heating process, and the heat conducting oil storage tank 6 will not be filled, and the liquid level is only between one third and one half. The heat conducting oil is heated by the jacket and then returns to the heat conducting oil storage tank 6 for oil gas separation and next cycle.

[0037] In the reaction process of the sulfide ore, sulfur steam is generated and migrated with the tail gas, and the temperature is lowered in the migration process, the sulfur steam is condensed into solid, which is easy to cause pipeline blockage, therefore, the jacketed tail gas pipe 7 is adopted for connection, the jacketed tail gas pipe 7 is heated by the heat conducting oil to avoid the cooling of the sulfur steam. At the same time, the jacketed tail gas pipe 7 is arranged to have an inclination angle of 5°-85° with the horizontal plane, the upper port of the jacketed tail gas pipe 7 is communicated with the gas outlet of the jacketed reaction kettle 3, and the lower port of the jacketed tail gas pipe 7 is communicated with the gas inlet of the desulfurization tower 8, even if the sulfur steam is cooled into liquid sulfur, it can also flow naturally, further reducing the probability of pipe blockage.

[0038] The embodiment further comprises a shredder 1 and a vacuum feeding machine 2, the shredder 1 is used for crushing the sulfide ore powder agglomerates, and then the vacuum feeding machine 2 is used for feeding the sulfide ore powder agglomerates into the feed inlet of the jacketed reaction kettle 3.

[0039] After the sulfide ore powder is fed, the agglomerates are first crushed by the shredder 1, and then fed into the jacketed reaction kettle 3 by the vacuum feeding machine 2. The shredder 1 and the vacuum feeding machine 2 are connected by a pipeline, the inflection point of the pipeline does not turn a right angle, but a round angle, so as to avoid pipeline blockage.

[0040] In order to enhance the effect of tail gas absorption treatment, the tail gas treatment device is arranged in two groups, and the gas outlet of the tail gas absorption tank 9 of the first group of tail gas treatment devices is communicated with the gas suction port 101 of the ejector of the second group of tail gas treatment devices.

[0041] The tail gas treatment device further comprises an absorption liquid preparation tank 12, the liquid outlet of the absorption liquid preparation tank 12 is connected with one end of a delivery pump through a pipeline, the top of the tail gas absorption tank 9 is provided with a liquid supplement port, and the other end of the delivery pump is communicated with the liquid supplement port of the tail gas absorption tank 9 through a pipeline. When the liquid level in the tail gas absorption tank 9 is lowered, the absorption liquid preparation tank 12 can be used for supplement.

[0042] The gas from the jacketed reaction kettle 3 contains sulfur dioxide and sulfur vapor, which needs to be treated by absorption. The gas is cooled during the backward migration process, and the sulfur vapor will condense into solid sulfur, causing pipe blockage. Therefore, desulfurization is required. The mixed gas enters the desulfurization tower 8, and the sulfur is changed into a solid state by water spray cooling to achieve separation, and other gases are absorbed in the later stage, so there is no risk of pipe blockage.

[0043] In this embodiment, the desulfurization tower 8 is a vertical structure, and the inside is a cavity except for the spray head 84. It is composed of a spray section 81, a liquid storage section 82, and a sand settling section 83 from top to bottom. The gas inlet of the desulfurization tower 8 is arranged through the lower outer wall of the spray section 81, the gas outlet of the desulfurization tower 8 is arranged through the top outer wall of the spray section 81, the spray head 84 is arranged at the position below the gas outlet at the top of the desulfurization tower 8, the liquid outlet is arranged through the lower outer wall of the liquid storage section 82, the liquid outlet is connected to one end of the second circulating pump 85 through a pipeline, and the other end of the second circulating pump 85 is connected to the spray head 84 through a pipeline. The bottom of the sand settling section is connected to a blowdown valve. The tail gas enters from the bottom of the spray section 81, is cooled by the spray liquid, and the sulfur is separated. The sulfur particles are deposited in the sand settling section 83 and are periodically discharged through the blowdown valve. The liquid storage section 82 is filled with supernatant after spraying, which can be pumped to the spray head 84 by the second circulating pump 85 for circular spraying.

[0044] Please refer to Figs. 1-3 The application provides a use method of a sulfide ore micro-negative pressure concentrated sulfuric acid roasting and leaching device, which comprises the following steps:

[0045] Step 1, providing the above equipment;

[0046] Step 2, feeding: sending sulfide ore powder into the shredder 1 hopper through hoisting equipment, crushing the clumps, sending the crushed clumps into the jacketed reaction kettle 3 through the vacuum feeder 2, closing the feeding valve after feeding is completed;

[0047] Step 3, leaching and dissolving: opening the first circulating pump 91 of the tail gas absorption tank 9, maintaining micro-negative pressure in the jacketed reaction kettle 3, the dissolving tank 4 and the desulfurization tower 8 through the action of the ejector 10, opening the heat conduction oil furnace 5 to heat the jacketed reaction kettle 3 and the jacketed tail gas pipe 7, opening the agitator of the jacketed reaction kettle 3, adding leaching agent, and discharging the material into the dissolving tank 4 after the reaction is completed;

[0048] Step 4, sulfur blocking: opening the second circulating pump 85 in the desulfurization tower 8 when the reaction in the jacketed reaction kettle 3 starts, the tail gas generated in the kettle enters the desulfurization tower 8 through the jacketed tail gas pipe 7, the spray liquid at the top of the tower cools the sulfur vapor in the tail gas to become a solid, achieving sulfur vapor interception, and gathering in the sand settling section 83 of the desulfurization tower 8;

[0049] Step 5, tail gas absorption: the tail gas of sulfur vapor is removed and continuously enters the tail gas absorption tank 9 for purification, and is discharged after meeting the relevant national standards.

[0050] The use method of the sulfide ore micro-negative pressure concentrated sulfuric acid roasting leaching device has the following advantages: 1. Safe and efficient leaching under micro-negative pressure conditions; 2. The method has low requirements for the pressure resistance of the equipment, small main investment, and is suitable for large-scale production.

[0051] The above description is a detailed description of the preferred embodiments of the present application, but the embodiments are not intended to limit the scope of the patent application of the present application. Any equivalent changes or modifications made under the technical spirit of the present application should be included in the scope of the patent.

Claims

1. A sulfide ore micro-negative pressure concentrated sulfuric acid roasting leaching device, characterized in that: it comprises a jacketed reaction kettle (3), a dissolving tank (4), a jacketed heating device, a jacketed tail gas pipe (7), a desulfurization tower (8), a tail gas treatment device, a tail gas discharge pipe (11); the tail gas treatment device comprises an ejector (10) and a tail gas absorption tank (9), the ejector (10) is provided with an ejector air suction port (101), an ejector liquid inlet (102) and an ejector liquid outlet (103); the tail gas absorption tank (9) is provided with a liquid inlet, a liquid outlet and a gas outlet, the liquid inlet of the tail gas absorption tank (9) is communicated with the ejector liquid outlet (103), the liquid outlet of the tail gas absorption tank (9) is connected with a first circulating pump (91), the first circulating pump (91) is communicated with the ejector liquid inlet (102) through a pipeline, the gas outlet of the tail gas absorption tank (9) is communicated with the tail gas discharge pipe (11); the tail gas treatment device is provided in two groups, the gas outlet of the tail gas absorption tank (9) of the first group of tail gas treatment devices is communicated to the ejector air suction port (101) of the second group of tail gas treatment devices; the tail gas treatment device further comprises an absorption liquid preparation tank (12), the liquid outlet of the absorption liquid preparation tank (12) is connected with one end of a delivery pump through a pipeline, the top of the tail gas absorption tank (9) is provided with a liquid supplementing port, the other end of the delivery pump is communicated with the liquid supplementing port of the tail gas absorption tank (9) through a pipeline; the top of the jacketed reaction kettle (3) and the dissolving tank (4) is provided with a feed inlet and a gas outlet, the bottom is provided with a discharge outlet; the side wall of the desulfurization tower (8) is provided with an air inlet, the top is provided with a gas outlet, and the bottom is provided with a blowdown port; the discharge outlet of the jacketed reaction kettle (3) is connected to the feed inlet of the dissolving tank (4) through a pipeline, the gas outlet of the jacketed reaction kettle (3) is connected to the air inlet of the desulfurization tower (8) through the jacketed tail gas pipe (7), and the gas outlet of the desulfurization tower (8) is communicated to the air suction port (101) of the ejector (10) through a pipeline; the desulfurization tower (8) is a vertical structure, which is composed of a spraying section (81), a liquid storage section (82) and a sand settling section (83) from top to bottom, the air inlet of the desulfurization tower (8) is through the lower outer wall of the spraying section (81), the gas outlet of the desulfurization tower (8) is through the top outer wall of the spraying section (81), the spraying head (84) is arranged at a position below the gas outlet at the top of the desulfurization tower (8), the liquid outlet is through the lower outer wall of the liquid storage section (82), one end of the second circulating pump (85) is communicated through a pipeline, the other end of the second circulating pump (85) is communicated with the spraying head (84) through a pipeline; the blowdown valve is communicated with the bottom of the sand settling section. ​ ​ 2. The apparatus for roasting and leaching of sulphide ore by micro negative pressure concentrated sulphuric acid in accordance with claim 1, characterized in that: The outer surface of the jacketed reaction kettle (3) and the jacketed tail gas pipe (7) is provided with a jacket; the jacket heating device comprises a heat conducting oil furnace (5) and a heat conducting oil storage tank (6), the oil outlet of the heat conducting oil storage tank (6) is communicated with the oil inlet of the heat conducting oil furnace (5) through a heat conducting oil pump, the oil outlet of the heat conducting oil furnace (5) is communicated with the jacket inlet of the jacketed reaction kettle (3) through a pipeline, the jacket outlet of the jacketed reaction kettle (3) is communicated with the jacket inlet of the jacketed tail gas pipe (7) through a pipeline, and the jacket outlet of the jacketed tail gas pipe (7) is communicated with the oil inlet of the heat conducting oil storage tank (6) through a pipeline.

3. The apparatus for micro-negative pressure concentrated sulfuric acid roasting leaching of sulfide ores according to claim 1, characterized in that: The jacketed tail gas pipe (7) is arranged at an inclination angle of 5°-85° with the horizontal plane.

4. The apparatus for micro-negative pressure concentrated sulfuric acid roasting leaching of sulfide ores according to claim 1, characterized in that: The device further comprises a shredder (1) and a vacuum feeding machine (2), the shredder (1) is used for crushing the caked part of the sulfide ore powder, and then the vacuum feeding machine (2) is used for feeding the caked part into the feed inlet of the jacketed reaction kettle (3).

5. The apparatus for micro-negative pressure concentrated sulfuric acid roasting leaching of sulfide ores according to claim 1, characterized in that: The jacketed reaction kettle (3), the dissolving tank (4), the desulfurization tower (8) and the tail gas treatment device are all sealed devices.

6. A method of using a sulphide ore micro-subatmospheric concentrated sulphuric acid roasting leaching apparatus, characterised by, The device comprises the following steps: Step 1, providing a sulfide ore micro-negative pressure concentrated sulfuric acid roasting and leaching device as claimed in any one of claims 1-5; Step 2, feeding: the sulfide ore powder is sent into the hopper of the shredder (1) through hoisting equipment, the caked part is crushed, and then the caked part is sent into the jacketed reaction kettle (3) through the vacuum feeding machine (2), the feeding is completed, and the feed valve is closed; Step 3, leaching and dissolving: the first circulating pump (91) of the tail gas absorption tank (9) is started, the jacketed reaction kettle (3), the dissolving tank (4) and the desulfurization tower (8) are kept in a micro-negative pressure state through the action of the ejector (10), the heat conducting oil furnace (5) is started, the jacketed reaction kettle (3) and the jacketed tail gas pipe (7) are heated, the agitator of the jacketed reaction kettle (3) is started, and the leaching agent is added, and then the material is unloaded into the dissolving tank (4) after the reaction is completed; Step 3, sulfur blocking: when the reaction in the jacketed reaction kettle (3) starts, the second circulating pump (85) in the desulfurization tower (8) is started, the tail gas generated in the kettle enters the desulfurization tower (8) through the jacketed tail gas pipe (7), the spray liquid at the top of the tower cools the sulfur vapor in the tail gas and changes it into a solid, so that the sulfur vapor is intercepted and gathered in the sand settling section of the desulfurization tower (8); Step 4, tail gas absorption: the tail gas after the sulfur vapor is removed continues to enter the tail gas absorption tank (9) for purification, and is discharged after meeting the relevant national standards. Step 1, providing a sulfide ore micro-negative pressure concentrated sulfuric acid roasting and leaching device as claimed in any one of claims 1-5;

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