CN114314657B - Production device and method for continuously preparing arsenic trioxide - Google Patents
Production device and method for continuously preparing arsenic trioxide Download PDFInfo
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- CN114314657B CN114314657B CN202210150692.2A CN202210150692A CN114314657B CN 114314657 B CN114314657 B CN 114314657B CN 202210150692 A CN202210150692 A CN 202210150692A CN 114314657 B CN114314657 B CN 114314657B
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Abstract
The invention relates to the technical field of arsenic trioxide preparation, in particular to a production device and a method for continuously preparing arsenic trioxide from coarse arsenic trioxide. A production apparatus for continuously preparing arsenic trioxide, comprising: the feeding device, the thermal reaction device, the hot air blowing device, the arsenic receiving device, the flue gas treatment device, the induced air device and the discharging device are connected and controlled by the control device; the outlet of the feeding device is communicated with the bottom inlet of the thermal reaction device, the outlet of the hot air blowing device is communicated with the bottom inlet of the thermal reaction device, the outlet of the thermal reaction device is communicated with the inlet of the arsenic collecting device through a pipeline, the outlet of the arsenic collecting device is communicated with the flue gas treatment device through a pipeline, the outlet of the induced air device is communicated with the inlet of the flue gas treatment device and the top outlet of the arsenic collecting device, and the bottom outlet of the arsenic collecting device is connected with the discharging device. The invention can prepare high-purity arsenic trioxide in a large batch, continuously and automatically.
Description
Technical Field
The invention relates to the technical field of arsenic trioxide preparation, in particular to a production device and a method for continuously preparing arsenic trioxide from coarse arsenic trioxide.
Background
Arsenic trioxide (commonly known as arsenic) is mainly used as insecticide, rust-removing preservative, chemical agent and the like in agriculture and coating and pharmaceutical industries. At present, the process technology for separating and refining the coarse arsenic trioxide serving as a raw material to obtain high-purity arsenic trioxide mainly utilizes the characteristic that the arsenic trioxide is easy to sublimate, and impurities (oxides of iron, zinc and the like) in the arsenic trioxide are not sublimated to separate, generally the arsenic trioxide is performed in a vacuum sublimation furnace, sublimation temperature and condensation temperature are controlled, and impurities in the arsenic trioxide are separated and removed, so that the high-purity arsenic trioxide is obtained. In the conventional preparation method for extracting arsenic by the existing sublimation method, the purity of the prepared arsenic trioxide is not high, and the prepared arsenic trioxide generally only reaches the risk of secondary arsenic trioxide (the arsenic trioxide contains about 98 percent), has a severe working environment and causes serious arsenic pollution to the surrounding environment.
Aiming at the improvement of the production and purification of arsenic trioxide, the following two technologies exist: chain belt type process furnace and steel belt conveying type process furnace. The basic principle of the two production processes is that coarse arsenic (coarse arsenic trioxide) is conveyed into a process furnace through a belt conveyor, after an inlet is sealed, the process furnace is heated and insulated, the arsenic trioxide product flue gas is conveyed into a product collecting bin from an outlet at the top of the furnace, and then the process furnace is opened to convey the coarse arsenic trioxide into the process furnace again, so that the arsenic trioxide is prepared in a circulating and reciprocating mode.
The two production processes improve the production efficiency, but in the production process, the problems that the process furnace is not tightly sealed, faults frequently occur, the product quality is unstable, the production cost is greatly increased, the labor intensity is high, the environmental pollution is not effectively controlled, and workers directly participating in production are difficult to work for a long time. In addition, the production process can not be used for preparing arsenic trioxide in a large scale, continuously, with low energy consumption and automation, and is difficult to realize the industrial production requirements and meet the requirements of energy conservation, emission reduction and environmental protection. Therefore, developing a device and a process method for preparing high-purity arsenic trioxide in a batch, continuous and automatic way by taking coarse arsenic trioxide (the arsenic trioxide contains about 96 percent) as a material is the current research direction.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a production device and a method for preparing arsenic trioxide from coarse arsenic trioxide, wherein the device and the method are used for continuously preparing high-purity arsenic trioxide from coarse arsenic trioxide by a sublimation method, the production device and the method can greatly improve the automation degree, and meanwhile, the continuous feeding is adopted, the fluctuation of material components is small, the reaction effect is stable, the production safety of the whole production system is high, and the mass preparation of arsenic trioxide can be carried out under a sealed environment.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a production apparatus for continuously producing arsenic trioxide, the apparatus comprising: the feeding device, the thermal reaction device, the hot air blowing device, the arsenic receiving device, the flue gas treatment device, the induced air device and the discharging device are connected and controlled by the control device; the outlet of the feeding device is communicated with the bottom inlet of the thermal reaction device in a sealing way, the outlet of the thermal blowing device is communicated with the bottom inlet of the thermal reaction device in a sealing way, the outlet of the thermal reaction device is communicated with the inlet of the arsenic collecting device in a sealing way through a pipeline, the outlet of the arsenic collecting device is communicated with the flue gas treatment device in a sealing way through a pipeline, the outlet of the air inducing device is communicated with the inlet of the flue gas treatment device and the top outlet of the arsenic collecting device in a sealing way, and the bottom outlet of the arsenic collecting device is connected with the discharging device in a sealing way.
Further, the thermal reaction device comprises a boiling reaction furnace which is vertically arranged, and a stirring device which is vertically arranged at the bottom in the boiling reaction furnace, wherein outlets of the feeding device and the hot air blowing device are respectively communicated with the boiling reaction furnace in a sealing manner, and the feeding device and the hot air blowing device are oppositely arranged at two sides of the boiling reaction furnace.
Furthermore, a plurality of groups of horizontal spoilers are arranged on the inner wall of the upper part of the boiling reaction furnace in a staggered way.
Further, the arsenic collecting device comprises a first-stage cooling device, a second-stage crystallization collecting device, a third-stage crystallization collecting device and a fourth-stage dust collecting device, wherein the bottom outlets of the first-stage cooling device are respectively and hermetically connected with the discharging device, the inlet of the first-stage cooling device is hermetically communicated with the top outlet of the thermal reaction device, the outlet of the first-stage cooling device is hermetically communicated with the top inlet of the second-stage crystallization collecting device, the top outlet of the second-stage crystallization collecting device is hermetically communicated with the top inlet of the third-stage crystallization collecting device, the top outlet of the third-stage crystallization collecting device is hermetically communicated with the top inlet of the fourth-stage dust collecting device, and the top outlet of the fourth-stage dust collecting device is hermetically connected with the bottom inlet of the flue gas treatment device.
Further, the secondary crystallization collecting device, the tertiary crystallization collecting device and the quaternary dust collecting device are respectively connected with the discharging device in a sealing way through the discharging device, the discharging device comprises a primary discharging valve which is communicated with the arsenic collecting device in a sealing way and a secondary discharging valve which is connected with the primary discharging valve in a sealing way through a pipeline, and the secondary discharging valve is connected with the discharging device in a sealing way.
Further, the hot air blowing device comprises a fan and a heating furnace, wherein an outlet of the fan is connected with an inlet of the heating furnace in a sealing manner, and an outlet of the heating furnace is communicated with an inlet at the bottom of the thermal reaction device in a sealing manner.
Further, the feeding device and the discharging device are both spiral conveying metering devices.
Another object of the present invention is to provide a method for continuously preparing arsenic trioxide using the production apparatus described above, comprising the steps of:
s1: setting various parameters of a feeding device, a hot air blowing device, a thermal reaction device, an arsenic collecting device, a flue gas treatment device, a discharging device and an induced air device through a control device, controlling the blowing temperature of the hot air blowing device to be 400-500 ℃ and controlling the temperature in the arsenic collecting device to be 50-300 ℃;
s2: starting a hot blowing device, a hot reaction device and an induced draft device;
s3: the feeding device feeds coarse arsenic trioxide through the set feeding parameters, performs sublimation reaction with hot air blown by the hot air blowing device after stirring and scattering of the thermal reaction device to generate arsenic trioxide gas, performs crystallization collection through the arsenic collecting device, conveys the arsenic trioxide gas into a finished product bin through the discharging device, and performs centralized treatment on the uncrystallized gas through the flue gas treatment device;
s4: and S3, continuously preparing the arsenic trioxide by repeating the steps.
Compared with the prior art, the invention has the beneficial effects that:
1. by adopting the technical scheme, the invention not only can continuously prepare the arsenic trioxide from the coarse arsenic trioxide by using a sublimation method in a large batch, but also can ensure that the whole preparation system is in a closed state and avoid potential safety hazards caused by leakage of arsenic trioxide smoke.
2. The control device is used for connecting and controlling the feeding device, the thermal reaction device, the hot air blowing device, the arsenic collecting device, the smoke treatment device, the air inducing device and the discharging device so as to realize automation of arsenic trioxide preparation, realize unattended operation and have good popularization and application prospects.
3. In the whole system of the production device, the front end adopts the hot air blowing device to blow air, and the rear end adopts the air inducing device to conduct negative pressure air induction, so that the fluidity of substances in the whole production system is quickened, and the production efficiency is improved.
4. Related equipment such as a feeding device and a discharging device can adopt a spiral conveying metering device, a discharging device can adopt a discharge valve controlled by a servo motor, a hot air blowing device can adopt a Roots blower and a heating furnace, an arsenic collecting device can adopt the existing condensation kettle and dust collecting equipment, a flue gas treatment device can adopt a spray tower and water bath treatment technology, the related equipment and the technology are standardized equipment, the whole production system is convenient to build, and the development cost of system equipment is saved.
5. The thermal reaction device adopts the boiling reaction furnace, and the stirring device is arranged at the bottom of the boiling reaction furnace in a sealing way, so that the arsenic trioxide coarse material is scattered while the thermal reaction is carried out, and the sublimation reaction efficiency of the arsenic trioxide coarse material is improved while caking and blockage are avoided; through setting up the spoiler of horizontal direction in boiling reacting furnace, further improve the sufficiency of arsenic trioxide coarse material sublimation reaction and control the velocity of flow of arsenic trioxide flue gas.
6. The discharging device adopts a secondary discharging mechanism, so that the tightness of the whole production system can be improved, arsenic trioxide smoke is prevented from escaping from the discharging device, a temporary storage box can be arranged between the two discharging mechanisms, and the temporary storage box is uniformly discharged after being full, so that the discharging device is prevented from running all the time, and energy conservation and consumption reduction are realized.
7. The four-stage arsenic collecting mechanism is adopted in the arsenic collecting device, so that the arsenic collecting efficiency and the arsenic collecting quality are further improved.
Drawings
Fig. 1 is a schematic overall structure of an embodiment of the present invention.
FIG. 2 is a schematic structural view of an embodiment of the thermal reaction apparatus of the present invention.
Fig. 3 is an enlarged schematic view of a part of the section at a in fig. 2.
Fig. 4 is an enlarged schematic view of the cross section of the stirring device at a in fig. 2.
Fig. 5 is an enlarged schematic view of the structure at B of fig. 1.
In the figure: 1. the device comprises a feeding device, 11 parts of spiral conveying metering devices, 12 parts of feeding ports, 2 parts of thermal reaction devices, 21 parts of boiling reaction furnaces, 211 parts of combustion chambers, 2111 parts of cooling pipelines, 212 parts of heat preservation furnace bodies, 213 parts of connecting cylinders, 22 parts of stirring devices, 221 parts of motors, 222 parts of stirring shafts, 223 parts of stirring paddles, 224 parts of stirring frames, 225 parts of dustproof sealing covers, 226 parts of racks, 23 parts of stirring plates, 24 parts of overhaul holes, 25 parts of emptying ports, 3 parts of hot air blowing devices, 31 parts of fans, 32 parts of heating furnaces, 4 parts of arsenic collecting devices, 41 parts of primary cooling devices, 42 parts of secondary crystallization collecting devices, 43 parts of tertiary crystallization collecting devices, 44 parts of quaternary dust collecting devices, 5 parts of flue gas treatment devices, 6 parts of induced draft devices, 7 parts of discharging devices, 8 parts of discharging devices, 81 parts of primary discharging valves, 82 parts of secondary discharging valves, 83 parts of temporary storage boxes.
Detailed Description
The following is a further detailed description of embodiments of the invention in conjunction with the examples.
Referring to fig. 1, a production apparatus for continuously preparing arsenic trioxide, the apparatus comprising: the feeding device 1, the thermal reaction device 2, the hot air blowing device 3, the arsenic collecting device 4, the flue gas treatment device 5, the induced air device 6 and the discharging device 7 are connected and controlled by the control device; the outlet of the feeding device 1 is communicated with the bottom inlet of the thermal reaction device 2 in a sealing way, the outlet of the hot air blowing device 3 is communicated with the bottom inlet of the thermal reaction device 2 in a sealing way, the outlet of the thermal reaction device 2 is communicated with the inlet of the arsenic collecting device 4 in a sealing way through a pipeline, the outlet of the arsenic collecting device 4 is communicated with the flue gas treatment device 5 in a sealing way through a pipeline, the outlet of the air inducing device 6 is communicated with the inlet of the flue gas treatment device 5 and the top outlet of the arsenic collecting device 4 in a sealing way, and the bottom outlet of the arsenic collecting device 4 is connected with the discharging device 7 in a sealing way.
The production device is used for continuously preparing and purifying the arsenic trioxide from coarse arsenic trioxide with the arsenic trioxide content of more than 96 percent and crushed to granularity smaller than 1 mm.
And the feeding device 1 is used for conveying the coarse arsenic trioxide material into the thermal reaction device 2 to sublimate to generate arsenic trioxide flue gas. The feeding device 1 comprises a spiral conveying metering device 11 in the horizontal direction, a feeding port 12 is arranged on the spiral conveying metering device 11, and an outlet of the spiral conveying metering device 11 is communicated with a bottom inlet of the thermal reaction device 2 in a sealing mode through a sealing flange. Coarse arsenic trioxide enters the feeding device 1 through the feeding port 12. By using the screw conveyor metering device 11 as a feeding device, the arsenic trioxide coarse material is in a sealed state during feeding.
The thermal reaction device 2 is used for sublimating, heating and oxidizing the coarse arsenic trioxide and generating arsenic trioxide gas. Referring to fig. 2, 3 and 4, the thermal reaction device 2 comprises a boiling reaction furnace 21 arranged vertically, and a stirring device 22 arranged vertically at the bottom in the boiling reaction furnace 21, wherein outlets of the feeding device 1 and the thermal blowing device 3 are respectively communicated with the boiling reaction furnace 21 in a sealing manner, and the feeding device 1 and the thermal blowing device 3 are arranged on two sides of the boiling reaction furnace 21 relatively.
The boiling reaction furnace 21 comprises a combustion chamber 211, a heat preservation furnace body 212 which is communicated with the upper end surface of the combustion chamber 211 in a sealing way through a sealing flange, and a connecting cylinder 213 which is connected with the outer circumference of the combustion chamber 211 in a sealing way outside the combustion chamber 211, wherein the connecting cylinder 213 is fixed on a frame 226 through a fastening bolt, the bottom in the connecting cylinder 213 is in an inverted cone shape, and a gap is arranged between the bottom in the connecting cylinder 213 and the bottom of the combustion chamber 211 so that hot air can conveniently enter the combustion chamber 211; an air inlet is formed in the connecting cylinder 213, and an outlet of the hot air blowing device 3 is communicated with the air inlet in a sealing manner through a flange. The furnace wall of the combustion chamber 211 has a hollow structure, and a cooling pipe 2111 is provided therein, so that cooling water can be injected to control the temperature of the furnace wall and the inner space of the combustion chamber 211.
The stirring device 22 comprises a motor 221, a stirring shaft 222 driven by the motor 221 through a belt pulley, a stirring paddle 223 fixedly installed on the stirring shaft 222, and a stirring frame 224 sleeved on the stirring shaft 222 and fixed on a frame 226, wherein a conical dustproof sealing cover 225 is arranged on the stirring frame 224 extending into the combustion chamber 211, the stirring paddle 223 and the stirring frame 224 extend into the combustion chamber 211, and a gap is arranged between the dustproof sealing cover 225 on the stirring frame 224 and the bottom of the combustion chamber 211 so that hot air can conveniently enter the combustion chamber 211.
At the same time of forming a closed space by the combustion chamber 211, the stirring frame 223, the dustproof sealing cover 225 and the connecting cylinder 213, because gaps are arranged among the combustion chamber 211, the hot air generated by the hot air blowing device 3 enters the combustion chamber 211 through the gaps and reacts with the coarse arsenic trioxide to generate arsenic trioxide flue gas and other impurity gases.
By arranging the stirring paddles 224 in the combustion chamber 211, the arsenic trioxide coarse materials conveyed by the feeding device 1 can be stirred and scattered, so that the contact area of the arsenic trioxide coarse materials and oxygen is increased to improve the reaction efficiency while the caking of the arsenic trioxide coarse materials is avoided.
Because the bottom of the connecting cylinder 213 is of an inverted cone structure, the outer circumference of the bottom of the combustion chamber 211 is of an inverted cone structure, the upper part of the stirring frame 224, which goes deep into the combustion chamber 211, is of a cone structure, the conicity of the bottom of the combustion chamber 211 is larger than that of the connecting cylinder 213, and when hot air generated by the hot air blowing device 3 enters the combustion chamber 211 through a gap, the hot air can ascend along the cone surface of the stirring frame 224 while reducing wind resistance, so that the phenomenon that the reaction is insufficient due to direct blowing of coarse arsenic trioxide is avoided.
A heat preservation layer is arranged in the heat preservation furnace body 212, a vent 25 is arranged at the top end of the heat preservation furnace body 212, and the upper part of the heat preservation furnace body 212 is communicated with the inlet of the arsenic collecting device 4 in a sealing way through a pipeline.
The inner wall of the heat preservation furnace body 212 is provided with a plurality of groups of horizontal spoilers 23 in a staggered manner, and the spoilers 23 are used for controlling the upward speed of the generated arsenic trioxide flue gas, and in addition, the reaction area of the arsenic trioxide coarse fodder can be increased, and the sufficiency of the reaction is improved. The spoiler 23 can be provided as a fin structure, so that the contact area between unreacted arsenic trioxide coarse powder and the spoiler can be further increased, and the generation efficiency and the full rate of arsenic trioxide can be improved at a higher temperature.
In order to facilitate the maintenance of the thermal reaction device 2, a maintenance hole 24 may be formed in the wall of the heat-insulating furnace body 212.
And the hot blast device 3 is used for generating hot air and reacting with the coarse arsenic trioxide fed by the feeding device 1 to generate arsenic trioxide gas. The blowing device comprises a fan 31 and a heating furnace 32, wherein the outlet of the fan 31 is connected with the inlet of the heating furnace 32 in a sealing way, and the outlet of the heating furnace 32 is communicated with the inlet of the connecting cylinder 213 of the thermal reaction device 2 in a sealing way.
The fan 31 can be a Roots fan, the control device can control the rotating speed of the fan 31 to control the wind speed, and can control the temperature of the heating furnace 32 to control the reaction speed of the arsenic trioxide coarse materials in the thermal reaction device.
And an arsenic collecting device 4 for cooling and crystallizing the arsenic trioxide gas. The arsenic collecting device 4 comprises a first-stage cooling device 41, a second-stage crystallization collecting device 42, a third-stage crystallization collecting device 43 and a fourth-stage dust collecting device 44, wherein the bottom outlets of the first-stage cooling device 41 and the third-stage crystallization collecting device 43 are respectively connected with the discharging device 7 in a sealing manner.
The inlet of the primary cooling device 41 is communicated with the top outlet of the heat preservation furnace body 212 of the thermal reaction device 2 in a sealing way through a pipeline, the outlet of the primary cooling device is communicated with the top inlet of the secondary crystallization collecting device 42 in a sealing way through a pipeline, the top outlet of the secondary crystallization collecting device 42 is communicated with the top inlet of the tertiary crystallization collecting device 43 in a sealing way through a pipeline, the top outlet of the tertiary crystallization collecting device 43 is communicated with the top inlet of the quaternary dust collecting device 44 in a sealing way through a pipeline, and the top outlet of the quaternary dust collecting device 44 is connected with the bottom inlet of the flue gas treatment device 5 in a sealing way through a pipeline.
The primary cooling device 41 can be an existing water cooling kettle or a cooling pipe with a water cooling device arranged at the inner part and the outer part, the secondary crystallization collecting device 42 and the tertiary crystallization collecting device 43 can be bag type dust collectors, the quaternary dust collecting device 44 can be precise dust collecting equipment such as a pulse type dust collector, the arsenic trioxide gas cools the high-temperature gas coming out of the thermal reaction device 2 through the primary cooling device 41, and the secondary crystallization collecting device 42, the tertiary crystallization collecting device 43 and the quaternary dust collecting device 44 crystallize and collect the cooled arsenic trioxide gas so as to achieve the purpose of collecting arsenic.
In order to maintain the sealing effect of the whole system, arsenic trioxide gas is prevented from escaping into the atmosphere through the arsenic collecting device 4 and the discharging device 7, the secondary crystallization collecting device 42, the tertiary crystallization collecting device 43 and the quaternary dust collecting device 44 are respectively connected with the discharging device 7 in a sealing way through the discharging device 8, the discharging device 8 comprises a primary discharging valve 81 respectively connected with the bottoms of the secondary crystallization collecting device 42, the tertiary crystallization collecting device 43 and the quaternary dust collecting device 44 in a sealing way, the secondary discharging valve 82 is connected with the primary discharging valve 81 in a sealing way through a pipeline, and the secondary discharging valve 82 is connected with the discharging device 7 in a sealing way.
In order to avoid the energy consumption caused by continuous discharging of the discharging device, a temporary storage box 83 can be connected between a first-stage discharging valve 81 and a second-stage discharging valve 82, a weighing metering device is arranged in the temporary storage box 83, in the circulation process of discharging, the first-stage discharging valve 81 is firstly opened, arsenic trioxide solids fall into the temporary storage box 83 until reaching the upper limit threshold value set by the weighing metering device, the first-stage discharging valve 81 is closed, the second-stage discharging valve 82 is opened, arsenic trioxide solids fall into the discharging device 7 and are conveyed to a finished product bin, when reaching the lower limit threshold value set by the weighing metering device in the temporary storage box 83, the second-stage discharging valve 82 is closed, and the arsenic trioxide solids collected by the second-stage crystallization collecting device 42, the third-stage crystallization collecting device 43 and the fourth-stage dust collecting device 44 enter the temporary storage box 83, so that the circulation is repeated.
And a discharging device 7 for conveying the crystallized arsenic trioxide into the collecting container. The discharging device 7 can be a horizontally arranged screw conveyor, the outlets of the secondary discharging valves 82 are respectively connected with the screw conveyor through sealing flanges, and the sealing effect of the discharging flow can be realized through the screw conveyor.
And a flue gas treatment device 5 for collecting and concentrating impurity gases which fail to crystallize. The impurity gas which fails to pass through the condensation crystallization or dust collection device needs to be treated, and the flue gas treatment device can use a spray tower and water bath technology in the prior art for treatment.
And the induced air device 6 is used for forming a negative pressure state in the whole production device and accelerating the forward movement of the arsenic trioxide gas. The outlet of the induced air device 6 is hermetically communicated with the inlet of the flue gas treatment device 5 and the top outlet of the four-stage dust collection device 44 of the arsenic collecting device 4.
The control device is used for connecting and controlling the feeding device 1, the hot air blowing device 3, the thermal reaction device 2, the arsenic collecting device 4, the flue gas treatment device 5, the discharging device 7, the air inducing device 6 and the discharging device 8. The control device is connected with and controls the devices, so that the automatic and digital control of the production system can be realized, even unmanned production can be realized, and the production system can be regulated according to actual production parameters, production environment and production modes.
For example, the control device can control the feeding speed and the feeding amount by controlling the feeding device 1, control the discharging device 8 to control the discharging speed, the discharging amount and the discharging interval, control the hot blast device 3 to control the wind speed and the blast temperature, control the hot reaction device 2 to control the hot reaction temperature, control the arsenic receiving device 4 to control the arsenic receiving speed and the arsenic receiving amount, control the flue gas treatment device 5 to control the waste gas treatment speed and the treatment amount, and control the discharging device 7 to control the discharging speed and the discharging amount. The existing programs can be utilized by the programs for controlling parameters of various related devices by the control device, so that the control and the construction of the whole production system are facilitated, the production efficiency and the production safety of arsenic trioxide are improved, and the construction cost of the whole production system is reduced.
The feeding device 1, the hot air blowing device 3, the thermal reaction device 2, the arsenic collecting device 4, the flue gas treatment device 5, the discharging device 7 and the induced air device 6 can be provided with a plurality of groups, and the control device can respectively control the plurality of groups of automatic operation, so that the production efficiency can be further improved.
On the premise of adopting the production device for continuously preparing the arsenic trioxide, the production method for continuously preparing the arsenic trioxide comprises the following steps of:
s1: setting various parameters of a feeding device 1, a hot air blowing device 3, a hot reaction device 2, an arsenic collecting device 4, a flue gas treatment device 5, a discharging device 7 and an induced air device 6 through a control device, controlling the blowing temperature of the hot air blowing device 3 to be 400-500 ℃ and controlling the temperature in the arsenic collecting device 4 to be 50-300 ℃;
s2: starting the hot blast device 3, the thermal reaction device 2 and the induced draft device 6;
s3: the feeding device 1 feeds coarse arsenic trioxide through set feeding parameters, performs sublimation reaction with hot air blown in by the hot air blowing device 3 after stirring and scattering of the thermal reaction device 2 to generate arsenic trioxide gas, performs crystallization collection through the arsenic collecting device 4, conveys the arsenic trioxide gas into a finished product bin through the discharging device, and performs centralized treatment on the uncrystallized impurity gas through the flue gas treatment device;
s4: and S3, continuously preparing and purifying the arsenic trioxide.
The above specific embodiments and examples are specific support for technical ideas of a production device and a method for continuously preparing arsenic trioxide, which are provided by the present invention, and the scope of protection of the present invention is not limited thereto, and any equivalent changes or equivalent modifications made on the basis of the technical scheme according to the technical ideas provided by the present invention still belong to the scope of protection of the technical scheme of the present invention.
Claims (5)
1. A production device for continuously preparing arsenic trioxide is characterized in that: the device comprises: the feeding device, the thermal reaction device, the hot air blowing device, the arsenic receiving device, the flue gas treatment device, the induced air device and the discharging device are connected and controlled by the control device; the outlet of the feeding device is communicated with the bottom inlet of the thermal reaction device in a sealing way, the outlet of the hot air blowing device is communicated with the bottom inlet of the thermal reaction device in a sealing way through a pipeline, the outlet of the arsenic collecting device is communicated with the flue gas treatment device in a sealing way through a pipeline, the outlet of the air inducing device is communicated with the inlet of the flue gas treatment device and the top outlet of the arsenic collecting device in a sealing way, and the bottom outlet of the arsenic collecting device is connected with the discharging device in a sealing way;
the hot reaction device comprises a boiling reaction furnace which is vertically arranged and a stirring device which is vertically arranged at the bottom in the boiling reaction furnace, outlets of the feeding device and the hot air blowing device are respectively communicated with the boiling reaction furnace in a sealing manner, and the feeding device and the hot air blowing device are oppositely arranged at two sides of the boiling reaction furnace;
the arsenic collecting device comprises a first-stage cooling device, a second-stage crystallization collecting device, a third-stage crystallization collecting device and a fourth-stage dust collecting device, wherein the bottom outlets of the first-stage cooling device are respectively and hermetically connected with the second-stage crystallization collecting device, the inlet of the first-stage cooling device is hermetically connected with the top outlet of the thermal reaction device, the outlet of the first-stage cooling device is hermetically connected with the top inlet of the second-stage crystallization collecting device, the top outlet of the second-stage crystallization collecting device is hermetically connected with the top inlet of the third-stage crystallization collecting device, the top outlet of the third-stage crystallization collecting device is hermetically connected with the top inlet of the fourth-stage dust collecting device, and the top outlet of the fourth-stage dust collecting device is hermetically connected with the bottom inlet of the flue gas treatment device;
the secondary crystallization collecting device, the tertiary crystallization collecting device and the quaternary dust collecting device are respectively connected with the discharging device in a sealing way through the discharging device, the discharging device comprises a primary discharging valve which is communicated with the arsenic collecting device in a sealing way and a secondary discharging valve which is connected with the primary discharging valve in a sealing way through a pipeline, and the secondary discharging valve is connected with the discharging device in a sealing way.
2. The production apparatus for continuously producing arsenic trioxide according to claim 1, characterized in that: a plurality of groups of horizontal spoilers are arranged on the inner wall of the upper part of the boiling reaction furnace in a staggered way.
3. The production apparatus for continuously producing arsenic trioxide according to claim 1, characterized in that: the hot air blowing device comprises a fan and a heating furnace, wherein an outlet of the fan is connected with an inlet of the heating furnace in a sealing manner, and an outlet of the heating furnace is communicated with an inlet at the bottom of the thermal reaction device in a sealing manner.
4. The production apparatus for continuously producing arsenic trioxide according to claim 1, characterized in that: the feeding device and the discharging device are both spiral conveying metering devices.
5. A production method using the production apparatus for continuously producing arsenic trioxide according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
s1: setting various parameters of a feeding device, a hot air blowing device, a thermal reaction device, an arsenic collecting device, a flue gas treatment device, a discharging device and an induced air device through a control device, controlling the blowing temperature of the hot air blowing device to be 400-500 ℃ and controlling the temperature in the arsenic collecting device to be 50-300 ℃;
s2: starting a hot blowing device, a hot reaction device and an induced draft device;
s3: the feeding device feeds coarse arsenic through the set feeding parameters, performs sublimation reaction with hot air blown by the hot air blowing device after stirring and scattering of the thermal reaction device to generate arsenic trioxide gas, performs crystallization collection through the arsenic collecting device, and conveys the arsenic trioxide gas into a finished product bin through the discharging device, and performs centralized treatment on the uncrystallized arsenic through the flue gas treatment device;
s4: and S3, continuously preparing the arsenic trioxide by repeating the steps.
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