CN217516034U - Spiral discharging device for arsenic trioxide purification system - Google Patents

Abstract

The utility model relates to a spiral discharging device for an arsenic trioxide purification system, which comprises a spiral conveyer and a driving motor in transmission connection with the spiral conveyer, wherein one end of the spiral conveyer extends into the arsenic trioxide purification system, and a slag shovel is arranged on a section of the spiral conveyer extending into the arsenic trioxide purification system; the slag shovel comprises an inclined plate, and baffles are respectively fixed on two side edges of the inclined plate; an opening is formed in the side portion of the spiral conveyor, and the top edge of the inclined plate is fixed to the spiral conveyor along the lower edge of the opening; the section of the screw conveyer outside the arsenic trioxide purification system is provided with a discharge hole. The utility model discloses a spiral discharging device for arsenic trioxide purification system can conveniently clear up the slag charge of remaining in the system when purifying to outside in time discharging the slag charge to the system, degree of automation is higher, need not to rely on the manpower to slag tap.

Description

Spiral discharging device for arsenic trioxide purification system

Technical Field

The utility model relates to a spiral discharging device for arsenic trioxide purification system, which belongs to the field of smelting equipment.

Background

Arsenic (Arsenic), commonly known As Arsenic, is a nonmetallic element in the periodic Table of elements, in the 4 th cycle, group VA, atomic number 33. Arsenic is widely present in nature and hundreds of arsenic minerals have been discovered. Arsenic compound arsenic trioxide is called arsenic trioxide, which is a highly toxic substance.

Arsenic has wide application, and is commonly used as a formula raw material of pesticide preparations, wood preservation, feed additives, Chinese and western medicine preparations and the like. The arsenic trioxide can be used as a main material to be smelted into the simple substance arsenic, and the simple substance arsenic trioxide can be widely applied to semiconductor electronic software, hard alloy, military industry and the like, however, the substance has strong toxicity and serious pollution, the smelting industry technology is complex, and scientific research personnel and workers really engaged in the professional research are few, so that the desire of eliminating and banning the arsenic smelting by an earth method is not realized for a long time, and the research and development of a new smelting technology is urgent. In recent years, a small number of manufacturers make technical and technological improvements, and the improvement is still not substantially achieved. The technical transformation is further needed, and the aims of energy conservation, emission reduction and environmental protection are achieved.

Aiming at the purification of arsenic trioxide, the method mainly comprises the following two existing purification technologies: (1) a chain belt type process furnace and (2) a steel belt conveying type process furnace.

The two technologies have key difficult and complicated problems in the respective process technology and are not solved. Frequent faults, high normal production difficulty, unstable product quality, high production cost, high labor intensity, ineffective control of environmental pollution and great influence on the body of an operator.

Specifically, the chain belt type process furnace has the following main characteristics and defects:

1. the furnace is horizontal, the total length is about 30 meters, the appearance is supported by a steel frame, the width is about 1.8 meters, the height is about 2 meters, the furnace is divided into two layers, and the lower layer with the length being less than 1.3 meters is used as a chain encircling channel. The upper layer is an arsenic trioxide purification combustion chamber, the interior of the combustion chamber is a refractory brick wall body with the thickness of about 30cm around, a top refractory plate is paved, the upper layer of the plate is made of heat-insulating material, and the lower layer of the plate is provided with heating electric furnace wires. The function is to supply the heat for purifying the arsenic trioxide. The bottom structure in the combustion chamber is paved and leveled by using a fire-resistant plate from the furnace head to the furnace tail, and the purpose is to install a plurality of small raw material hoppers on a chain to pass through the furnace smoothly when entering the furnace for purification and combustion. This process is similar to a conventional belt conveyor. Continuously feeding the arsenic trioxide purification raw material into a furnace for production.

2. The process has complete auxiliary facilities in the purification furnace section, and a full-automatic conveyor and a full-automatic feeder are arranged at the feeding position of the furnace end. The furnace tail is provided with a quick slag cooling faucet, a slag material packing machine and the like.

3. The production steps are as follows: checking that safety facilities in each production stage are normal, firstly heating the furnace to 700 ℃, starting a chain conveyor with a bucket, starting a full-automatic feeder to feed materials, feeding the materials into the furnace to react, outputting the materials out of the furnace tail, discharging water to cool slag, packaging the slag, and collecting and packaging arsenic products.

4. The process is reasonably feasible from the flow point of view. However, it does not consider whether the physical and chemical reaction property of arsenic trioxide at a high temperature of 700 ℃ is in a state suitable for the designed equipment, and normal production is difficult to realize.

The process has the production defects that:

1. the raw materials are loaded into a chain bucket and enter a furnace to be heated, and then strong chemical and physical reactions are generated to form an oil sludge state. The slag is adhered to the inner wall of the chain bucket and cannot be peeled off, and the slag cannot be poured out after being discharged, so that the continuous and cyclic production cannot be carried out.

2. After the slag charge is discharged from the furnace tail, water is immediately added for cooling, huge toxic smoke and haze containing arsenic are generated, and environmental pollution is large.

3. The space area between the chain hoppers is large, the gaps between the furnace head and the furnace tail are too large to be sealed, the leakage pollution is large, and the operation environment is influenced.

4. The sealing property needs to be enhanced, and part of dust outside the furnace is pumped into the product by means of high-power negative pressure suction during production, so that the exceeding of harmful substances is easily caused.

5. The chain belt bucket is added with the loaded raw materials, so that the load is high, the continuous operation is carried out at high temperature, the steel softening speed is high, the chain belt bucket is not durable, and the phenomenon of smelting interruption frequently occurs. Specifically, the steel belt conveyor type process furnace mainly has the following characteristics and defects:

the steel belt conveyor type process furnace is horizontal, is horizontally laid on the ground level of a production workshop, has the overall length of about 50 meters, is supported by an appearance main body steel frame, has the overall width of 2.1 meters and the height of 2 meters, is divided into three layers of structural forms, is respectively provided with process tasks of each layer, and is used for the whole steel belt to surround a running channel at the lower layer. The middle layer is used for heating and heat transfer at the bottom of the furnace and plays a role of smooth transportation with steel belts in the furnace, the total thickness of the middle layer is about 50cm, refractory bricks are laid from the top to the tail, an electric furnace wire is arranged at a distance of 30cm from the top to the tail, and a refractory plate is laid on the electric furnace wire. The plate plays a role in protecting the electric furnace wires, and simultaneously transmits heat energy generated by the electric furnace wires to the surface of the refractory plate and continuously transmits the heat energy to raw materials laid on the steel belt.

The upper layer structure and the function are as follows:

two side walls from the furnace head to the furnace tail are built by refractory bricks. The top is tightly paved by a fire-resistant plate. The whole upper layer forms a high-temperature channel. An electric furnace wire is hung below the top refractory plate at a distance of 30cm, heat is radiated to the raw material on the steel belt for purification, and then the flue gas of the arsenic trioxide product is sent into a product collecting bin from an outlet at the top of the furnace.

Auxiliary facilities of the steel belt furnace:

the auxiliary facilities of the steel belt are arranged at the two ends of the feed inlet and the slag outlet in the furnace, are main components of the flow process of the process, and comprise an automatic feeding strip, a slag cooling strip, a dustproof facility and the like.

The production steps are as follows:

1. checking all safety equipment and facilities before production;

2. starting a temperature rise button in the furnace to rise the temperature to 700 ℃;

3. starting the whole-process automatic facility to operate;

4. starting the steel belt to run during production, adding the purified arsenic trioxide raw materials into the steel belt by an automatic feeder, inputting the steel belt into a high-temperature furnace for combustion, basically burning the slag through a conveying stroke in the furnace for about one hour, outputting the slag out of the furnace, and entering a water-discharging cooling process, thus finishing the primary process.

Summary of process practicality:

the overall layout of the process flow appears to be compatible with an industrial process flow, but it also fails to recognize the question of whether the physical and chemical reaction conditions of arsenic trioxide under high, medium and low temperature conditions are compatible with the equipment facilities of the process.

The process has the following defects:

1. raw materials for purifying arsenic trioxide come from smelting smoke dust, the smoke dust contains other metals and nonmetals besides arsenic, the smoke dust has certain corrosivity, and the steel strip is extremely severely corroded at high temperature in the purification process, so that the steel strip is easily worn and broken. Meanwhile, under the action of high temperature, the materials are melted to form a molten state, and easily flow out of the steel strip and permeate into the refractory plate to cause short circuit of the resistance wire at the bottom of the furnace. The replacement of the electric furnace wire is difficult, and the replacement loss is large after the furnace is cooled.

2. The energy consumption is large, and the utilization rate of the heat generated in the furnace can only reach about 60 percent. The reason is that the total width of the steel strip is 1.5 m, and the lower electric furnace wire should be disconnected in order to prevent the raw material on the steel strip from flowing out of the steel strip after being changed into liquid. Therefore, the left and right sides of the steel strip surface must be respectively reserved with a position of 0.3 m width, and raw materials cannot be added. This is one of the important reasons for the low heat utilization efficiency.

In conclusion, the two technologies have many points to be improved, and the higher and higher requirements on energy conservation, emission reduction and environmental protection are difficult to meet.

Therefore, the applicant develops a novel arsenic trioxide purification system so as to improve the treatment efficiency and better meet the requirements of energy conservation, emission reduction and environmental protection. In order to better meet the slag tapping requirement of the novel arsenic trioxide purification system, the applicant specially develops a spiral discharging device for the arsenic trioxide purification system.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art, the utility model aims to provide a spiral discharging device for arsenic trioxide purification system to convenient in time discharge arsenic trioxide purification system remains the slag charge in the system when carrying out the purification to arsenic trioxide material.

In order to solve the technical problem, the technical scheme of the utility model as follows:

a spiral discharging device comprises a spiral conveyor and a driving motor in transmission connection with the spiral conveyor, wherein one end of the spiral conveyor extends into an arsenic trioxide purification system, and a slag shovel is arranged on a section of the spiral conveyor extending into the arsenic trioxide purification system; the slag shovel comprises an inclined plate, and baffles are respectively fixed on two side edges of the inclined plate; an opening is formed in the side portion of the spiral conveyor, and the top edge of the inclined plate is fixed to the spiral conveyor along the lower edge of the opening; and a discharge port is arranged on the section of the screw conveyor outside the arsenic trioxide purification system.

The charging tray of arsenic trioxide purification system can be relatively the shovel of slagging tap and rotate, and the slag charge on the charging tray bottom surface can be scraped by the shovel of slagging tap to pushed screw conveyer, finally see off to the system outside through screw conveyer, and then avoid artifical slagging tap, use manpower sparingly, reduce cost.

Further, be equipped with many sand grips on the swash plate, many sand grips distribute along the length direction of swash plate in proper order, the sand grip is parallel with the width direction of swash plate to prevent that the slag charge from rolling down from the swash plate, slag tap better.

Further, the sand grip is the triangular prism type, and a side and the swash plate laminating of sand grip, the side that screw conveyer was kept away from to the sand grip is less than the side that the sand grip is close to screw conveyer and the contained angle of swash plate with the contained angle of swash plate.

Furthermore, the included angle between the side surface of the convex strip far away from the spiral conveyor and the inclined plate is 10-20 degrees.

Furthermore, the spiral conveyer further comprises a plurality of telescopic supports, and the spiral conveyer is fixed on the telescopic supports.

The novel arsenic trioxide purification system developed by the applicant comprises a side wall and a furnace cover, wherein the inner side wall of the side wall is cylindrical, the furnace cover is arranged at the top of the side wall, the side wall and the furnace cover enclose a hearth, the furnace cover is provided with a smoke outlet communicated with the hearth, and a plurality of heating elements are arranged in the hearth;

a material tray which is in clearance fit with the hearth is arranged in the hearth and is positioned below the heating element, the material tray and the side wall share a central axis, and a driving mechanism for driving the material tray to rotate around the central axis is arranged at the bottom of the material tray;

the device also comprises a feeding mechanism used for adding materials (namely arsenic trioxide raw materials to be purified) into the material tray and a discharging mechanism used for discharging slag materials in the material tray.

Thus, the side wall, the furnace cover and the material tray can enclose a relatively closed purification reaction space, the material tray can rotate relative to the hearth, raw arsenic trioxide to be purified can be continuously added into the material tray through the feeding mechanism, the temperature in the hearth is kept at the required purification temperature through the heating element, the raw arsenic trioxide to be purified is continuously heated and reacted while rotating along with the material tray, the arsenic trioxide in the raw material is continuously gasified, separated from impurities and discharged through the smoke outlet; when waiting the arsenic trioxide raw materials of purification to rotate to discharge mechanism position, because the raw materials has walked one section stroke, the arsenic trioxide probably gasifies totally this moment, can discharge remaining slag charge through discharge mechanism according to the circumstances at this moment, so can constantly feed in raw materials, constantly slag tap according to the circumstances, effectively promote treatment effeciency. By controlling the rotating speed of the material tray and the adding speed of the materials, continuous production can be easily realized, even continuous feeding and continuous slag discharging are realized, and heat is effectively utilized.

Optionally, the tray is a disc.

Optionally, the material tray is annular, and at least 1 annular groove extending along the circumferential direction of the material tray is formed in the material tray; when the number of the annular grooves is 2 or more than 2, the annular grooves share the central axis, and the outer diameters of the annular grooves are sequentially increased.

Further, the side wall includes first side wall and second side wall, the inside wall of first side wall is cylindricly, the lateral wall of second side wall is cylindricly, first side wall, the common central axis of second side wall, and the internal diameter of first side wall is greater than the external diameter of second side wall, the furnace casing sets up in the top of first side wall, second side wall, and first side wall, second side wall and furnace casing enclose into furnace.

Furthermore, the bottom surface of the second side wall is suspended in the air and is positioned between the top surface of the rotating bracket and the top surface of the material tray; the arsenic trioxide purification system further comprises a hanging bracket and a plurality of hanging rods, the hanging rods are fixedly connected with the second side wall, and the upper ends of the hanging rods are fixed on the hanging bracket. So, gallows and jib mating reaction can play good reinforcing effect to the second side wall.

Thus, the first side wall, the second side wall, the furnace cover and the annular groove can enclose a relatively closed purification reaction space, the material tray can rotate relative to the hearth, the arsenic trioxide raw material to be purified can be continuously added into the annular groove through the feeding mechanism, the temperature in the hearth is kept at the required purification temperature condition through the heating element, the arsenic trioxide raw material to be purified is continuously heated and reacted while rotating along with the material tray, the arsenic trioxide in the raw material is continuously gasified, separated from impurities and discharged through the smoke outlet; when the arsenic trioxide raw material to be purified rotates to the position of the discharging mechanism, the raw material is moved by a stroke, the arsenic trioxide is gasified completely, and residual slag can be discharged through the discharging mechanism according to the condition. By controlling the rotating speed of the material tray and the adding speed of the materials, the continuous production can be easily realized, even the continuous feeding and the continuous discharging are realized, and the heat is effectively utilized. Additionally, the utility model discloses a material adds in the annular groove, and the material is heated when intensification to about 500 ℃, even if the material forms the paste liquid state this moment, can not flow everywhere yet, can effectively reduce and avoid polluted environment and avoid equipment corrosion.

In the system, the heating element is positioned above the material tray and can radiate heat to materials in the material tray, so that the arsenic trioxide is efficiently gasified, and a good impurity separation effect is obtained.

Furthermore, the driving mechanism comprises a rotating support used for containing the material tray, a driving motor in transmission connection with the rotating support and a circular guide rail which is coaxial with the side wall, a plurality of walking wheels are arranged at the bottom of the rotating support, and the walking wheels are placed on the circular guide rail. Thus, the rotating bracket can rotate around the central axis stably and regularly.

Further, the angle required for rotating from the position of the charging mechanism to the position of the discharging mechanism around the central axis is more than 180 degrees and less than 360 degrees, further 225 degrees and 315 degrees, and further 270 degrees and 300 degrees when viewed along the rotating direction of the tray. Therefore, after the materials are added into the material tray, the materials need to pass through enough travel and time to reach the position of the discharging mechanism, so that the materials are better purified, and the continuous production is realized.

Further, the feeding mechanism is a spiral feeding mechanism, and one end of the feeding mechanism penetrates through the first side wall and extends to a position right above the material tray. Therefore, the mechanical automatic feeding can be realized, and the original mode of manual feeding is avoided.

Furtherly, be equipped with the draught fan in the exhaust port, so, can be so that the interior volatile flow direction exhaust port of furnace will in time take out to follow-up equipment, further processing.

Furthermore, one end of the spiral conveyor penetrates through the first side wall and extends into the hearth, and the spiral conveyor is in clearance fit with the first side wall; the discharging mechanism further comprises a plurality of telescopic supports arranged on the outer side of the first side wall, and the spiral conveyor is fixed on the telescopic supports. So, the accessible highly finely tunes screw conveyer, and then adjusts the position of the shovel of slagging tap to control ejection of compact opportunity. Optionally, the gap between the screw conveyor and the first side wall is filled with heat insulation cotton, so that heat loss can be prevented, a certain moving space can be reserved between the screw conveyor and the first side wall, and the height can be conveniently adjusted finely.

Furthermore, the charging tray comprises a refractory material layer and a steel shell layer which are sequentially distributed from inside to outside. Therefore, the condition that the arsenic-containing material is in direct contact with the metal part can be avoided, the corrosion of the arsenic-containing material to the metal part is effectively prevented, frequent overhaul and equipment replacement are avoided, continuous production can be realized, the automation degree is improved, the product quality is improved, the production cost is greatly reduced, and the problem of serious pollution in arsenic trioxide purification and smelting can be effectively solved.

When the arsenic trioxide purification system is used for purifying arsenic trioxide, the following steps can be carried out:

s1, starting a heating element to raise the temperature in the hearth to a target temperature;

s2, continuously adding the arsenic trioxide raw material to be purified into the annular groove through the feeding mechanism, and simultaneously starting the driving mechanism to drive the annular tray to rotate; subsequently, the discharge mechanism is opened as needed.

The arsenic trioxide purification system is high in treatment efficiency, continuous purification of arsenic trioxide can be achieved, equipment does not need to be corroded due to the fact that the arsenic trioxide flows everywhere when heated, the service life of the system can be effectively guaranteed, and pollution to the environment can be reduced.

The arsenic trioxide purification system has high degree of mechanization, can save labor and reduce cost.

The utility model discloses a spiral discharging device can conveniently clear up the slag charge of remaining in the system during purification to outside in time discharging the slag charge to the system, degree of automation is higher, need not to rely on the manpower to slag tap.

Drawings

FIG. 1 is a schematic diagram of the arsenic trioxide purification system of the present invention.

Fig. 2 is a sectional view of a tray of the present invention.

Fig. 3 is a schematic structural diagram of a driving mechanism of the present invention.

Fig. 4 is a top view of an actuating mechanism of the present invention.

Fig. 5 is a top view of a guide rail according to the present invention.

Fig. 6 is a schematic diagram of the relative position relationship among the material tray, the feeding mechanism and the spiral discharging device of the present invention.

Fig. 7 is a schematic sectional view of a discharging shovel of the discharging mechanism of the present invention.

Fig. 8 is a cross-sectional view of another tray of the present invention.

Detailed Description

The present invention will be described in detail with reference to examples. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

Example 1

Referring to fig. 1, fig. 6 and fig. 7, the spiral discharging device for the arsenic trioxide purification system comprises a spiral conveyer 801 and a driving motor 802 in transmission connection with the spiral conveyer 801, wherein one end of the spiral conveyer 801 extends into the arsenic trioxide purification system, and a slag shovel 803 is arranged on a section of the spiral conveyer 801 extending into the arsenic trioxide purification system; the slag shovel 803 comprises an inclined plate 8031, and baffle plates 8032 are respectively fixed on two side edges of the inclined plate 8031; an opening is formed in the side portion of the spiral conveyor 801, and the top edge of the inclined plate 8031 is fixed on the spiral conveyor 801 along the lower edge of the opening; the section of the screw conveyer 801 outside the arsenic trioxide purification system is provided with a discharge hole 805.

Be equipped with many sand grips 8033 on the swash plate 8031, many sand grips 8033 distribute in proper order along the length direction of swash plate 8031, sand grip 8033 is parallel with the width direction of swash plate 8031.

The raised line 8033 is in a triangular prism shape, one side surface of the raised line 8033 is attached to the inclined plate 8031, and an included angle between the side surface of the raised line 8033 far away from the screw conveyor 801 and the inclined plate 8031 is smaller than an included angle between the side surface of the raised line 8033 close to the screw conveyor 801 and the inclined plate 8033.

The included angle between the side face of the convex strip 8033 far away from the screw conveyor 801 and the inclined plate 8031 is 15 degrees.

The spiral conveyor further comprises 2 telescopic supports 804, and the spiral conveyor 801 is fixed on the telescopic supports 804.

Referring to fig. 1 to 7, the spiral discharging device is used in an arsenic trioxide purification system developed by the applicant, the arsenic trioxide purification system comprises a side wall and a furnace cover 3, wherein the side wall comprises a first side wall 1 and a second side wall 2, the inner side wall of the first side wall 1 is cylindrical, the outer side wall of the second side wall 2 is cylindrical, the first side wall 1 and the second side wall 2 share the same central axis, the inner diameter of the first side wall 1 is larger than that of the second side wall 2, the furnace cover 3 is arranged at the top of the first side wall 1 and the second side wall 2, the first side wall 1, the second side wall 2 and the furnace cover 3 enclose a ring-shaped hearth 4, the furnace hood 3 is provided with a smoke outlet 16 communicated with the hearth 4, a plurality of heating elements 9 are arranged in the hearth 4, the heating elements are heating rods, and the plurality of heating elements 9 are uniformly distributed along the circumferential direction of the hearth 4;

a charging tray 5 which is in clearance fit with the hearth 4 is arranged in the hearth 4, the width of the clearance is 1mm, and the proper size of the clearance is controlled, so that the rotating requirement of the annular charging tray can be met, and the dispersion of volatile matters penetrating through the clearance can be reduced as much as possible; the material tray is annular and is positioned below the heating element 9, an annular groove 6 extending along the circumferential direction of the material tray 5 is arranged on the material tray 5, the material tray 5 and the side wall share a central axis, and a driving mechanism for driving the material tray 5 to rotate around the central axis is arranged at the bottom of the material tray 5;

and a feeding mechanism 7 for adding materials into the groove 6 and a discharging mechanism 8 (namely the spiral discharging device) for discharging slag in the annular groove 6.

The driving mechanism comprises a rotating support 10 for containing the material tray 5, a driving motor' 11 in transmission connection with the rotating support 10 and a circular guide rail 12 which is coaxial with the side wall, a plurality of walking wheels 13 are arranged at the bottom of the rotating support 10, and the walking wheels 13 are placed on the circular guide rail 12. The circular guide rail 12 is a circular steel rail and is fixed on the workshop floor through a fixing foot 19. The rotary support 10 is a cross-shaped support and is formed by welding I-shaped steel, and 1 traveling wheel 13 is respectively arranged at the bottom of each of 4 end points of the cross-shaped support.

The bottom surface of the second side wall 2 is suspended and is positioned between the top surface of the rotating bracket 10 and the top surface of the material tray 5; the arsenic trioxide purification system further comprises a hanging bracket 14 and a plurality of hanging rods 15, the hanging rods 15 are fixedly connected with the second side wall 2, and the upper ends of the hanging rods 15 are fixed on the hanging bracket 14.

The angle required to rotate around the central axis from the position of the charging mechanism 7 to the position of the discharging mechanism 8 is 330 ° as seen in the rotating direction of the tray 5.

The feeding mechanism 7 is a spiral feeding mechanism, and one end of the feeding mechanism 7 penetrates through the first side wall 1 and extends to the position right above the annular groove 6. The feeding mechanism 7 is fixed on the ground through 2 support frames 18.

One end of the screw conveyer 801 extends into the hearth 4, the slag tapping shovel 803 is positioned on a section of the screw conveyer 801 extending into the hearth 4, and the discharge hole 805 is positioned on a section of the screw conveyer 801 positioned outside the hearth 4; the swash plate 8031 from top to bottom inclines towards the opposite direction of the direction of rotation of charging tray 5, the base of swash plate 8031 stretch into in the annular groove 6 and with the bottom surface butt of annular groove 6, the base of swash plate 8031 with the central axis coplane, optionally, the length on the base of swash plate can be as long as possible, do not influence the relative motion between shovel and the annular groove of slagging tap can to it is bigger to make the region that shovel can be arrived of shovel of slagging tap as far as possible. The inclined plate 8031 and the bottom surface of the annular groove form an included angle of 15 degrees. The arrangement of the convex strips on the inclined plate can enable slag on the inclined plate to move towards the direction of the screw conveyor better.

One end of the spiral conveyor 801 penetrates through the first side wall 1 and extends into the hearth 4, the spiral conveyor 801 is in clearance fit with the first side wall 1, and heat insulation cotton is filled in the clearance between the spiral conveyor and the first side wall.

An induced draft fan 17 is arranged in the smoke outlet 16.

The charging tray 5 comprises a refractory material layer 501 and a steel shell layer 502 which are sequentially distributed from inside to outside, the refractory material layer 501 is formed by building refractory bricks, the refractory bricks are hard in material and strong in corrosion resistance, the thickness of the refractory material layer 501 is 20cm, and on one hand, the refractory material layer has good heat preservation and constant temperature capability; on the other hand, the refractory material layer can isolate high temperature from being transferred to the steel shell layer, so that the service life of the steel shell layer is influenced, and meanwhile, the steel shell layer is prevented from being corroded due to the fact that the arsenic-containing material directly contacts the steel shell layer; on the other hand, the steel shell layer can play a better supporting role for the refractory material layer, the refractory material layer can protect the steel shell layer from being corroded in turn, and the steel shell layer and the refractory material layer take the advantages of the steel shell layer and the refractory material layer to make up for the defects, so that the service life of equipment is prolonged, and further guarantee is provided for continuous production. Optionally, the tray 5 is a disc, see fig. 8.

A purification method of arsenic trioxide is carried out by using the arsenic trioxide purification system; the method comprises the following steps:

s0, checking whether the functions of the parts such as the tray are normal;

s1, starting the heating element 9 to raise the temperature in the hearth 4 to a target temperature;

s2, continuously adding the arsenic trioxide raw material to be purified into the annular groove 6 through the feeding mechanism 7, and simultaneously starting the driving mechanism to drive the material tray 5 to rotate; and then, opening the discharging mechanism 8 as required, and discharging the residual slag out of the system in time.

The above-mentioned embodiments are illustrative and should not be construed as limiting the scope of the invention, which is defined by the appended claims, and all modifications of the equivalent forms of the present invention which are obvious to those skilled in the art after reading the present invention.

Claims (5)

1. The spiral discharging device for the arsenic trioxide purification system is characterized by comprising a spiral conveyor (801) and a driving motor (802) in transmission connection with the spiral conveyor (801), wherein one end of the spiral conveyor (801) extends into the arsenic trioxide purification system, and a slag shovel (803) is arranged on a section of the spiral conveyor (801) extending into the arsenic trioxide purification system; the slag shovel (803) comprises an inclined plate (8031), and baffle plates (8032) are respectively fixed on two side edges of the inclined plate (8031); an opening is formed in the side portion of the spiral conveyor (801), and the top edge of the inclined plate (8031) is fixed to the spiral conveyor (801) along the lower edge of the opening; the section of the screw conveyer (801) outside the arsenic trioxide purification system is provided with a discharge hole (805).

2. The spiral discharging device according to claim 1, wherein the sloping plate (8031) is provided with a plurality of ribs (8033), the plurality of ribs (8033) are sequentially distributed along the length direction of the sloping plate (8031), and the ribs (8033) are parallel to the width direction of the sloping plate (8031).

3. The spiral discharging device according to claim 2, wherein the rib (8033) is in a triangular prism shape, one side surface of the rib (8033) is attached to the inclined plate (8031), and an included angle between the side surface of the rib (8033) away from the screw conveyor (801) and the inclined plate (8031) is smaller than an included angle between the side surface of the rib (8033) close to the screw conveyor (801) and the inclined plate (8033).

4. Spiral discharge device according to claim 3, wherein the side of the rib (8033) facing away from the screw conveyor (801) forms an angle of 10-20 ° with the ramp (8031).

5. Spiral discharge apparatus according to any one of claims 1 to 4, further comprising a plurality of telescopic supports (804), said spiral conveyor (801) being fixed to the telescopic supports (804).

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