Drying and screening device for pretreating as-furnace mineral aggregate and using method of drying and screening device

Abstract

The invention discloses a drying and screening device for pretreating as-furnace mineral aggregate and a using method of the drying and screening device. The drying and screening device comprises a rectangular shell; a first feed port; the first screen is horizontally arranged on the upper portion in the rectangular shell, and a first screening space is formed in the rectangular shell; the second screen is horizontally arranged in the rectangular shell and located below the first screen, and a second screening space is formed between the second screen and the first screen; a first discharge port; a second discharge port; a second feed port; and the vibration motor is mounted at the bottom of the rectangular shell. The method has the beneficial effects that the high-temperature cinder waste heat generated after pyrite roasting is used for drying the charging mineral aggregate, the water content of the charging mineral aggregate is effectively controlled, meanwhile, the high-temperature cinder is isolated from the charging mineral aggregate, and direct reaction between the charging mineral aggregate and the high-temperature cinder is avoided.

Description

Technical Field

[0001] The invention relates to ore drying and screening in pyrite acid-making industry, and in particular to a drying and screening device for pre-treated ore entering a furnace and a use method thereof. Background Art

[0002] In the pyrite acid system, there are generally clear requirements for the moisture content and particle size of the raw materials entering the furnace. The particle size of the pyrite produced by the mining enterprise is small, and most of them are usually less than 100 microns. The moisture content of the ore is related to the production process of each mining enterprise. There are two types of pyrite ore, one is sulfur concentrate and the other is high-sulfur iron. Under normal circumstances, sulfur concentrate is not easy to agglomerate; if high-sulfur iron is piled for a long time, it is easy to contact with oxygen in the air, spontaneously combust and form sintering, and lumps appear. If the moisture content of the ore entering the furnace is too high, or there are too many lumps, it will not only cause frequent failures of the throwing machine, but in severe cases, it may cause the roasting furnace bed to be crushed, making it difficult to continue production. Therefore, the raw materials need to be screened and dried before entering the furnace. However, although the ore is screened at the front end, it is easy to agglomerate again in the silo or lower hopper after running for a period of time, resulting in unsatisfactory results. In addition, the moisture content of incoming ore is usually between 8% and 13%, while the production equipment requires the moisture content of the ore to be ≤8%. That is, the moisture content of the raw materials sometimes needs to be dried and sometimes does not need to be dried. The use of traditional drying equipment has high operating costs and the effect is not ideal.

[0003] For example, Chinese invention patent publication number CN104445094A discloses a sulfuric acid production process, whose process steps are as follows: (1) crushing and screening: pyrite is selected from the ore for crushing, and then suitable pyrite small particles of 4 to 5 mm are selected through screening; (2) roasting process; (3) purification process; (4) reaction heat recovery: a steam evaporation tube bundle is provided in the waste heat boiler, and the reaction heat obtained by cooling the furnace gas is transported to the water circulation system or other thermal system through the steam evaporation tube bundle; (5) drying process; (6) conversion process: the gas enters the conversion system through the sulfur dioxide blower, and the sulfur dioxide in the original furnace gas is oxidized into sulfur trioxide gas under the catalytic action of the vanadium catalyst; (7) absorption process. In this process, the pyrite that has been screened between steps (1) and (2) is often stored in the silo waiting for use, which will cause caking, and the water content is not controlled. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing pyrite ore fed into a fluidized bed furnace for roasting has too high water content and too many particles. To this end, a drying and screening device for pretreating the ore fed into the furnace and a method for using the device are provided.

[0005] The technical solution of the present invention is: a drying and screening device for pre-treating incoming ore, comprising: a rectangular shell; a first feed port, which is opened at one end of the top of the rectangular shell; a first screen, which is horizontally arranged at the upper part of the rectangular shell to form a first screening space in the rectangular shell; a second screen, which is horizontally arranged in the rectangular shell and located below the first screen, the mesh number of the second screen is greater than the mesh number of the first screen, and a second screening space is formed between the second screen and the first screen; a first discharge port, which is opened on a side of the first screening space away from the first feed port; a second discharge port, which is opened on a side of the second screening space away from the first feed port; a second feed port, which is opened on a side of the rectangular shell close to the first feed port and located below the second screen; a vibration motor, which is installed at the bottom of the rectangular shell.

[0006] An improvement of the above solution is that vertically extending crushing bars are alternately distributed at the top and bottom of the first screening space.

[0007] In the above solution, the side of the crushing rod facing the mineral material is a sharp surface.

[0008] A further improvement of the above scheme is that both ends of the inner bottom of the rectangular shell are provided with slopes located below the second feed port, and the slopes are fixedly connected with a plurality of rows of inclined baffles spaced apart along the length direction of the slopes.

[0009] The upper side surface of the inclined baffle in the above solution is a sharp surface.

[0010] A further improvement of the above scheme is that a belt is fixed between the two inclined baffles at the bottom, and the belt divides the part of the rectangular shell below the second screening space into two upper and lower spaces. A compression spring is fixed to the center of the bottom of the rectangular shell, and the compression spring contacts the bottom of the belt.

[0011] The method for using a drying and screening device for pre-treating incoming ore comprises the following steps: feeding pyrite into a rectangular shell from a first feed port, feeding high-temperature slag from a furnace bottom into a rectangular shell from a second feed port, starting a vibration motor, and allowing the pyrite to move forward in a first screening space, wherein small-sized particles fall into a second screening space, and large-sized particles are discharged from a first discharge port. The heat of the high-temperature slag from the furnace bottom rises to the second screening space and the first screening space, and the small-sized pyrite is dried, and the dried small-sized pyrite is discharged from the second discharge port.

[0012] The beneficial effect of the present invention is to utilize the waste heat of high-temperature slag generated after roasting pyrite to dry the ore entering the furnace, effectively control the water content of the ore entering the furnace, and at the same time isolate the high-temperature slag from the ore entering the furnace to avoid direct reaction between the ore entering the furnace and the high-temperature slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a drying and screening device for pre-treating incoming ore materials of the present invention; Figure 2 yes Figure 1 Schematic diagram of the middle breaker bar; Figure 3 It is a schematic diagram of a preferred example of a drying and screening device for pre-treating incoming ore materials of the present invention; In the figure, 1, rectangular shell, 2, first feed port, 3, first screen, 4, second screen, 5, first discharge port, 6, second discharge port, 7, second feed port, 8, vibration motor, 9, breaking rod, 10, ramp, 11, inclined baffle, 12, belt, 13, compression spring. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0015] like Figure 1 As shown, a drying and screening device for pre-treating incoming ore comprises: a rectangular shell 1; a first feed port 2, which is opened at one end of the top of the rectangular shell; a first screen 3, which is horizontally arranged at the upper part of the rectangular shell to form a first screening space in the rectangular shell; a second screen 4, which is horizontally arranged in the rectangular shell and is located below the first screen, the mesh number of the second screen is greater than the mesh number of the first screen, and a second screening space is formed between the second screen and the first screen; a first discharge port 5, which is opened on a side of the first screening space away from the first feed port; a second discharge port 6, which is opened on a side of the second screening space away from the first feed port; a second feed port 7, which is opened on a side of the rectangular shell close to the first feed port and is located below the second screen, and the second feed port is preferably a curved pipe with an opening facing upwards to ensure stable feeding and prevent pyrite from overflowing due to the vibration of the rectangular shell; a vibration motor 8, which is installed at the bottom of the rectangular shell.

[0016] As an embodiment of the present invention, vertically extending crushing bars are staggered at the top and bottom of the first screening space. When the pyrite moves toward the first discharge port in the first screening space, the crushing bars collide with it. The collision includes horizontal collision and vertical collision caused by the vertical vibration of the crushing bars with the rectangular shell. This helps to fully crush the pyrite, so that large-size pyrite and small-size pyrite are quickly separated. The separated small-size pyrite passes through the first screen and enters the second screening space. More preferably, Figure 2 As shown, the bottom of the breaker bar has a sharp corner, and the side of the breaker bar facing the mineral material is a sharp surface.

[0017] As an embodiment of the present invention, both ends of the inner bottom of the rectangular shell are provided with a slope 10 located below the second feed port, and the slope is fixed with multiple rows of inclined baffles 11 spaced apart along the length direction of the slope. When the high-temperature slag at the bottom of the furnace enters the second feed port, it falls into an inclined baffle on a slope, and the inclined baffle relies on the vibration force to throw up the high-temperature slag at the bottom of the furnace, which helps to quickly disperse the high-temperature slag at the bottom of the furnace and prevent heat accumulation. When the high-temperature slag at the bottom of the furnace moves forward to another slope, the inclined baffle on the slope prevents the high-temperature slag at the bottom of the furnace from moving forward, and at the same time provides a vibration force transmission medium for the high-temperature slag at the bottom of the furnace, so that it is thrown toward the second feed port, realizing the reciprocating motion of the high-temperature slag at the bottom of the furnace, and making full use of the waste heat energy of the high-temperature slag at the bottom of the furnace. The purpose of drying more pyrite with less high-temperature slag at the bottom of the furnace is achieved.

[0018] In order to achieve the effect of crushing the high-temperature slag at the furnace bottom and fully release its heat, the upper side surface of the inclined baffle is a sharp surface.

[0019] As a preferred embodiment of the present invention, Figure 3 As shown, a belt 12 is fixedly connected between the two inclined baffles at the bottom, and the belt divides the part of the rectangular shell below the second screening space into two spaces, and a compression spring 13 is fixedly connected to the center of the bottom of the rectangular shell, and the compression spring contacts the bottom of the belt. In this way, the high-temperature slag at the bottom of the furnace falls on the belt, and the vibration force of the rectangular shell makes the compression spring vibrate up and down, driving the belt to vibrate up and down periodically, ensuring that the high-temperature slag at the bottom of the furnace is evenly distributed on the belt.

[0020] The reason for designing the first screening space and the second screening space is that the temperature of the furnace bottom slag produced after the pyrite is roasted is relatively high, generally around 850°C, and this heat is difficult to recycle. If it is directly mixed with pyrite and heated, the local temperature will be too high, causing the pyrite material to react. The water in the pyrite material evaporates after being heated, thereby achieving drying. And the water content of the discharge material can be controlled by the feed amount of pyrite material and high-temperature slag.

Claims

1. A drying and screening device for pre-treating incoming ore, characterized by: include: A rectangular shell (1); a first feed inlet (2), the first feed inlet being opened at one end of the top of the rectangular shell; a first screen (3), the first screen being horizontally arranged at the upper part of the rectangular shell to form a first screening space in the rectangular shell; a second screen (4), the second screen being horizontally arranged in the rectangular shell and located below the first screen, the mesh number of the second screen being greater than the mesh number of the first screen, and a second screening space being formed between the second screen and the first screen; a first discharge port (5), the first discharge port being opened at a side of the first screening space away from the first feed inlet; a second discharge port (6), the second discharge port being opened at a side of the second screening space away from the first feed inlet; a second feed port (7), the second feed port being opened at a side of the rectangular shell close to the first feed inlet and located below the second screen; and a vibration motor (8), the vibration motor being mounted at the bottom of the rectangular shell.

2. The drying and screening device for pre-treating incoming ore as claimed in claim 1, characterized in that: Vertically extending crushing bars (9) are alternately distributed at the top and bottom of the first screening space.

3. The drying and screening device for pre-treating incoming ore as claimed in claim 2, characterized in that: The side of the crushing rod facing the mineral material is a sharp surface.

4. The drying and screening device for pre-treating incoming ore materials according to claim 1, characterized in that: Both ends of the inner bottom of the rectangular shell are provided with slopes (10) located below the second feed port, and the slopes are fixedly connected with a plurality of rows of inclined baffles (11) spaced apart along the length direction of the slope.

5. The drying and screening device for pre-treating incoming ore materials as claimed in claim 4, characterized in that: The upper side surface of the inclined baffle is a sharp surface.

6. The drying and screening device for pre-treating incoming ore as claimed in claim 4 or 5, characterized in that: A belt (12) is fixedly connected between the two inclined baffles at the bottom, the belt dividing the part of the rectangular shell below the second screening space into two upper and lower spaces, and a compression spring (13) is fixedly connected to the center of the bottom of the rectangular shell, the compression spring being in contact with the bottom of the belt.

7. The method for using the drying and screening device for pre-treating incoming ore according to any one of claims 1 to 6, characterized in that: The following steps are involved: Pyrite is put into the rectangular shell from the first feed port, and the high-temperature slag from the furnace bottom is put into the rectangular shell from the second feed port. The vibration motor is started, and the pyrite moves forward in the first screening space, and the small-sized particles therein fall into the second screening space, and the large-sized particles are discharged from the first discharge port. The heat of the high-temperature slag at the furnace bottom rises to the second screening space and the first screening space, and the small-sized pyrite is dried. The dried small-sized pyrite is discharged from the second discharge port.

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