CN111765473A - Arsenic-containing solid waste treatment system and treatment method - Google Patents

Abstract

The invention relates to a system and a method for treating arsenic-containing solid waste, comprising a rotary furnace, wherein the furnace tail of the rotary furnace is connected with a first sealing cover, and the furnace head of the rotary furnace is connected with a second sealing cover; the first feeding mechanism is arranged in the first sealing cover, and a discharge hole of the first feeding mechanism extends into the rotary furnace; and the second feeding mechanism is movably arranged on the side of the furnace end of the rotary furnace and is used for feeding materials from the furnace end of the rotary furnace to the rotary furnace. The two ends of the arsenic-containing solid waste treatment system are respectively provided with the feeding mechanism, so that the problem of wall sticking and blockage of materials can be conveniently solved; and the materials can be fed from two ends of the rotary furnace periodically, so that the phenomenon of wall sticking and blocking is prevented, and the treatment effect and efficiency are improved.

Description

Arsenic-containing solid waste treatment system and treatment method

Technical Field

The invention relates to a system and a method for treating arsenic-containing solid waste, and belongs to the field of solid waste treatment.

Background

With the rapid development of smelting industry, most of the smelting of gold, silver, copper, lead and the like generates a large amount of dangerous solid wastes containing sulfur and arsenic (arsenic) for a long time. The process technologies of dearsenification, arsenic preparation, arsenic treatment, arsenic prevention and the like have relatively original equipment and facilities, and the deposition is stored regularly, so that deposited arsenic-containing solid waste is not effectively treated and utilized, and serious environmental hidden dangers such as soil quality, water quality, atmosphere and the like are caused. The natural treatment cannot be obtained in a real time, so that the natural disease is harmful to the current generation and the offspring, and once the irresistible disastrous weather effect occurs, the natural disease is not imagined. The hidden troubles mainly lie in that arsenic has strong hypertoxicity, extremely complex process technology and low arsenic price, and few clinical scientific researchers really engaged in arsenic smelting and disposal are few, but a plurality of academic experts have reported a plurality of practical production process technologies which are not solved, and arsenic trioxide smelting starts from soil smelting which is left over almost for hundreds of years till now, and has no obvious scientific improvement. Therefore, the national ministry of ecological environment protection, the national institute of improvement and improvement, highly attaches importance to the problem of arsenic pollution, has repeatedly released documents related to arsenic pollution control, and the institute of improvement and improvement, in recent years, i.e., in 4 months in 2019, releases and banns the environmental protection of arsenic smelting by the earth method, and currently, there are three more common disposal methods: 1. the process includes the steps of (1) fully-manual cupola furnace, (2) ore blending, mixing and roasting treatment of a fluidized bed furnace for refining sulfuric acid, and (3) common general rotary furnace. The three methods have serious defects, normal production cannot be realized, the quality of arsenic products cannot meet the international requirement, the disposal cost is high, and the environmental pollution is serious.

The treatment of arsenic-containing solid waste by using a reverberatory furnace, a fluidized bed furnace and a common rotary furnace has respective defects:

for arsenic removal by reverberatory furnace, the nation has already announced banning, but as no updated process facility is developed to replace the earth method production, the earth method production still exists even though the nation has the policy of banning the earth method arsenic removal for a long time.

The model process principle of the reverberatory furnace is as follows:

the reverberatory furnace is horizontal and rectangular, the total length is about 12 meters, the width is about 3.6 meters, the top is arched, the reverberatory furnace is similar to a train tunnel, the height of a spreading platform in the furnace is 0.9 meter, the reverberatory furnace is suitable for manual operation, and a plurality of small door holes on two sides of the furnace are convenient for manual feeding, material turning and slag discharging. The furnace is divided into a furnace end and a furnace tail, and coal is added from the position 1 m away from the front end of the furnace end for combustion. Laying arsenic-containing solid waste backwards, receiving high-temperature sulfur and arsenic gasified to form flue gas, feeding the flue gas into an arsenic product collecting bin from the tail of the furnace, burning the top in the furnace to be high temperature mainly by coal according to the principle, and radiating heat to the added raw materials, so that the furnace is called a fully-manual soil-melting reverberatory furnace.

The main defects of the technology for treating arsenic-containing solid waste by using the reverberatory furnace are as follows:

hidden danger 1: the small doors and windows on the two sides in the furnace mostly need to be fed continuously for slag discharge and stir-fried by manpower, cannot be sealed, and have a large amount of extremely toxic smoke. The environment pollution of a working place is severe, the direct participation of workers can not guarantee the body at all, and the workers who persist for more than 1 year rarely suffer from diseases.

Hidden danger 2: a large amount of dust generated during coal charging and slag discharging can not enter arsenic products, so that the arsenic products are seriously unqualified.

Hidden danger 3: due to the high labor intensity, the manpower can not complete the work load of 8 hours, the actual operation time is about 5 hours, and the energy, the labor and the consumption are serious.

Hidden danger 4: the daily treatment capacity of the reverberatory furnace is small, the generated sulfur amount is also small, acid making equipment cannot be installed, the water content in solid waste is large, the generated steam cannot be used, and arsenic dust discharged by tail removal of a cloth bag rises. Therefore, sulfur dioxide produced by the reverberatory furnace and part of arsenic discharged from the tail cannot be effectively treated. Only depends on the method of removing sulfur and depositing arsenic by lime, thereby bringing serious defects and hidden troubles.

Relatively speaking, the method does not play a role in half-point disposal of arsenic-containing solid waste, and enlarges the hidden danger of environmental pollution. If lime and alkali are not used for removing sulfur and depositing arsenic in the tail gas discharge process, sulfur dioxide, arsenic dust and other highly toxic flue gas are directly discharged into the atmosphere and are extremely harmful. If the lime alkali spraying mode is adopted to remove sulfur and deposit arsenic, the method is equal to zero. The reason is that the sulfur dioxide, arsenic and other virulent substances are mixed with the lime slag into a whole and are piled on the ground to cause permanent pollution to soil quality and water quality, and then the soil quality is affected infinitely.

The brief introduction of the process for treating the sulfur concentrate and arsenic-containing solid waste in the fluidized bed furnace for preparing the sulfuric acid by the conventional fluidized bed furnace is as follows:

the acid making in the fluidized bed furnace is a mature process for hundreds of years, has a vertical gourd shape and irregular size, is provided with refractory bricks in a steel shell furnace outside the furnace body in quantity for keeping the temperature constant and keeping the temperature, is provided with a plurality of blast nozzle blast caps at the bottom of the furnace, instantly blows and boils sulfur concentrate entering the furnace for combustion by strong wind pressure, and has heat energy depending on the natural energy of minerals, and the sulfur content of the minerals requires 28 percent of granularity and more than 120 meshes. The main defects are as follows:

defect 1: the properties of the sulfur concentrate, such as physical chemistry and the like, are inconsistent under the same temperature condition with solid waste, sulfur in the sulfur concentrate is easy to be removed at the high temperature of 900 ℃, slag materials are easy to be boiled and blown to meet the technological requirements, and the solid waste is in a molten state at the high temperature of 500 ℃, so that slag is easy to wrap, fall to the bottom of the furnace and is agglomerated, and the furnace is dead. Meanwhile, the arsenic removal of the slag charge in the furnace is not thorough, the slag charge is seriously super arsenic, and the existence of dangerous waste is not avoided.

Defect 2: slag dust and arsenic trioxide blown by the fluidized bed furnace by large wind power are difficult to be separated cleanly at one time, arsenic products are unqualified, and secondary arsenic smelting and purification is required, so that the production and unnecessary expenses are seriously increased.

Defect 3: the sulfur-containing and arsenic-containing solid waste is in a sludge state, the water content is basically more than 50%, and impurities such as bricks, rotten tiles and the like are also arranged in the solid waste. Before entering the furnace, dehydrating and removing impurities by the following steps of 1: 5, stirring the mixture evenly, and then drying the mixture by pressure leakage to enter the furnace. More than 5 times of newly added arsenic-containing sewage is caused, some factories flush the sewage into iron red slag discharged by a fluidized bed furnace for sucking and drying still bring environmental hidden dangers, some factories balance the toxicity in water by using a large amount of medicaments, and simultaneously, the toxicity of another medicament appears, so that the method for treating arsenic-containing solid waste by utilizing the fluidized bed furnace has serious environmental pollution hidden dangers and can not achieve the aim of real treatment.

The brief introduction of disposing arsenic-containing solid waste by using a common rotary furnace:

a common rotary furnace is a kiln dedicated to the drying of minerals and zinc smelting. The exterior structure of rotary furnace is cylindrical steel casing, and the refractory brick of inner structure builds the structure, and the rotary furnace is horizontal to be set up, and the slope is 3-5, divides furnace end and stove tail, and is general, and the stove tail is high, and the furnace end is low, from the stove tail feeding, and the furnace end is slagging tap, and fuel is spouted into toward the stove tail from the furnace end, and the stove total length is 40~50 meters, or is longer. The outlets at the head and the tail are straight, the furnace is suitable for baking minerals, and the feeding materials from the furnace tail are heated and move out of the furnace head opening along with the operation in the direction of the furnace head to be dried. It is suitable for smelting zinc, but its method is different from drying, and the zinc ore powder and coal are fed from tail of furnace, passed through the high-temp. of above 1000 deg.C, and the material fed into the furnace is changed into liquid, and when it is rolled, the liquid can not stick to the high-temp. of furnace wall, the zinc is gasified at high temp., and fed into collecting bin, and the zinc powder product slag liquid is formed, and then the slag liquid can be quickly flowed out of furnace mouth, and soaked in cold water.

The common zinc smelting and mineral drying in the rotary furnace are mature processes for many years, if the processes are used for treating arsenic-containing solid waste, the ideal effect is difficult to achieve, but a considerable number of enterprises are also used for rotationally treating arsenic-containing solid waste, the faults in the rotary furnace are frequent, and the materials are seriously adhered to the furnace wall. The furnace is dead in less than 10 days of production in each period, the furnace needs to be shut down, cooled and cleaned, and then the production is continued, the loss is large, the arsenic product and the slag charge can not reach the minimum requirement and quality standard, and the arsenic pollution is also large.

The main defects of the rotary furnace for treating the arsenic-containing solid waste are as follows:

defect 1: the furnace is over long, and once the furnace wall is stuck and cannot be cleaned in time, the continuous production cannot be carried out.

Defect 2: the furnace body is in a straight cylinder shape, the outer diameter is too large, the circumference is about 8 meters, tight sealing is difficult to carry out, and highly toxic smoke is easy to leak and pollutes the environment.

Defect 3: the furnace body is in a straight cylinder shape, the diameters of all the parts are the same, the time of the material in the furnace is short, and the arsenic can not be completely removed.

Defect 4: the furnace is over long, the material running distance is far, the generated dust is much, and the dust is easy to be mixed into arsenic products, so that the arsenic products are impure.

Defect 5: the furnace is over-long, the temperature difference is extremely large, and the energy consumption is high.

Defect 6: the single-side feeding from the furnace tail cannot be balanced, and the temperature difference between the furnace head and the furnace tail is large.

And 7, defect: the feeding is from the upwind direction of the furnace tail, and difficult huge toxic flue gas is sprayed out from the feeding hole when feeding.

Arsenic-containing solid waste can not be scientifically treated for a long time, arsenic is gasified at high temperature, and is crystallized or powdered when meeting cold, if the arsenic is not well collected and utilized, the arsenic can drift to atmosphere and silts on the ground, the virulent property of the arsenic can never disappear no matter the arsenic is at high temperature or low temperature, according to related medical professional documents, the arsenic is carcinogenic, the smelting industry develops rapidly nowadays, and various flue dusts hardly contain the arsenic. Due to the lack of advanced scientific technologies for arsenic recovery, arsenic treatment, arsenic prevention and the like, the serious arsenic in local areas, soil, water rivers and atmosphere is caused, at present, people suffering from cancer diseases rise year by year, and the influence of arsenic pollution is more and more serious.

In order to solve the problems of serious defects of arsenic-containing solid waste treatment and the like, an applicant extracts resources in an environment-protecting mode, takes the environment-protecting mode of resource extraction as a central concept, consumes a lot of manpower, material resources and financial resources, organizes the field practice of the old, middle and young forces of arsenic in the past year, explores, finds, summarizes and demonstrates the defects of various historical process methods, and finally develops a device and a process for treating the arsenic-containing solid waste so as to solve the treatment problem of the arsenic-containing solid waste and effectively relieve the serious pollution problem of arsenic.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an arsenic-containing solid waste treatment system to facilitate the solution of the problem of sticking to the wall and dying the furnace; the second purpose of the invention is to provide a method for treating arsenic-containing solid waste.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a solid waste treatment system containing arsenic comprises a rotary furnace, wherein the tail of the rotary furnace is connected with a first sealing cover, the head of the rotary furnace is connected with a second sealing cover, and an exhaust port is formed in the first sealing cover; the device also comprises a first feeding mechanism and a second feeding mechanism, wherein the first feeding mechanism comprises a first chute obliquely arranged in the first sealing cover and a second chute with one end extending into the first sealing cover, the lower end of the first chute extends into the rotary furnace, and the second chute obliquely extends downwards to the position above the first chute towards the direction far away from the rotary furnace; the second chute penetrates through the wall of the first sealing cover, and the lower end of the second chute is positioned between the junction position of the second chute and the first sealing cover and the exhaust port; when the materials are fed through the first feeding mechanism, the first chute bears the materials from the second chute and feeds the materials into the rotary furnace;

the second feeding mechanism comprises a feeding trolley, a storage bin and a spiral feeder are arranged on the feeding trolley, and a feeding hole of the spiral feeder is communicated with the storage bin; an access door is arranged on the second sealing cover; when the material is fed through the second feeding mechanism, the discharge port of the spiral feeding machine sequentially penetrates through the inlet and outlet door and the furnace end of the rotary furnace and extends into the rotary furnace.

So, can realize the two-way feeding to the rotary furnace through first feed mechanism and second feed mechanism, general condition is interior input material through first feed mechanism to the rotary furnace, when appearing gluing the stifled stove phenomenon of wall in the rotary furnace, can stop first feed mechanism immediately, change the head direction feeding from the rotary furnace by second feed mechanism, through the feed quantity that increases the furnace end, make the arsenic that contains of furnace end section useless fiercely fire admittedly, the heat is towards the furnace tail extension to melt the viscidity that glues at the oven and fall, realize normal production, the normal operating of assurance system, and make the material obtain abundant processing, be favorable to promoting material treatment effect and treatment effeciency. In addition, the first feeding mechanism and the second feeding mechanism can be used for alternately feeding, the temperature difference between the furnace head section and the furnace tail end of the rotary furnace is balanced, and the phenomenon of furnace wall blockage is prevented.

The existence of the exhaust port generally causes the flow path of the flue gas in the first sealing cover to be approximately in the flow direction from the extending end of the rotary furnace to the exhaust port. According to the invention, through the cooperative fit of the first chute and the second chute, the junction position of the second chute and the first sealing cover is positioned at a position far away from the exhaust port and far away from the main body flue gas flow passage, so that the risk of flue gas in the first sealing cover overflowing from the junction position of the feeding chute and the first sealing cover is reduced, and the hidden danger of environmental pollution caused by toxic gas leakage is eliminated. The material can be fed into the furnace end section of the rotary furnace through the second feeding mechanism as required, and the second feeding mechanism can be drawn out of the second sealing cover in idle time, so that the operations of discharging slag, spraying fuel and the like are not influenced.

Furthermore, a support is arranged in the first sealing cover, and the first chute is placed on the support to realize fixation.

Furthermore, the lower end of the second chute is placed on the first chute, so that the second chute and the first chute are relatively fixed, and the material can pass through a gap only by reserving the place where the second chute is placed.

Further, the central axis of the first trough and the central axis of the second trough are coplanar.

Further, the central axis of the first chute and the central axis of the second chute are located in the same vertical plane.

Further, the exhaust port is positioned on one side wall of the first sealing cover, and the side wall is positioned on the opposite side of one end, extending into the first sealing cover, of the rotary furnace.

Optionally, the central axis of the first chute forms an angle of 30-50 ° with the horizontal plane.

Optionally, the central axis of the second chute forms an angle of 30-50 ° with the horizontal plane.

Optionally, a plurality of valves are arranged at the access door for the spiral feeder to stretch into or draw out, and smoke is prevented from leaking.

Further, still include the guide rail, the pay-off dolly sets up on the guide rail.

Furthermore, the rotary furnace comprises a cylindrical furnace body, cylindrical furnace necks are arranged at one end or two ends of the furnace body, the furnace body and the furnace necks share the central axis, the furnace necks extend into the corresponding sealing covers and are movably connected with the sealing covers, the outer diameters of the furnace necks are smaller than that of the furnace body, the furnace necks and the furnace body are integrally connected through annular transition plates, and the furnace necks, the transition plates and the furnace body jointly form a stepped structure.

Therefore, by arranging the furnace necks with smaller outer diameters at one end or two ends of the furnace body, the sealing connection difficulty between the rotary furnace and the sealing cover can be effectively reduced, and the flue gas leakage risk in the furnace body is reduced; in addition, when the furnace end position of rotary furnace formed the stair structure, the material got into rotary furnace and moved to the head end of furnace body after from the stove tail, can not discharge immediately, can "block" in rotary furnace by the stair structure, when the head end of furnace body accumulated abundant material, the material just can cross the stair structure and discharge, consequently, even adopt the rotary furnace that length is shorter, also can make the material remain longer time in rotary furnace, be favorable to the degree of depth, the abundant processing to the material.

Furthermore, one end of the furnace body close to the furnace end is provided with a first furnace neck, and one end of the furnace body close to the furnace tail is provided with a second furnace neck. Therefore, the two ends of the rotary furnace are respectively provided with the stepped structures, so that a good sealing movable connection relationship can be conveniently formed between the rotary furnace and the sealing cover; but also can ensure that the materials have longer retention time in the rotary furnace.

Further, the central axis of the furnace body is perpendicular to the transition plate.

Optionally, the transition plate is in a conical barrel shape, the cross-sectional area is gradually reduced from inside to outside, one end of the transition plate is integrally connected with the furnace body, and the other end of the transition plate is integrally connected with the furnace neck to form a certain angle, so that slag materials can be conveniently discharged.

Further, the length of the furnace body is 14-16 m; furthermore, the length of the furnace neck is 0.2-0.8 m. Because the furnace end is formed with a step structure, the length of the furnace body can be shortened to 14-16m, and the requirement of the retention time of materials in the furnace can be still met. The cleaning operation of the rotary furnace can be facilitated, for example, the steel drill rod is stretched into from the furnace head and the furnace tail respectively through manpower, the cleaning of the whole rotary furnace can be completed, and the cleaning difficulty is greatly reduced.

Further, the rotary furnace is inclined downwards from the furnace tail to the furnace head, and further the inclination angle is 3-5 degrees.

Based on the same inventive concept, the invention also provides an arsenic-containing solid waste treatment method, which is carried out by utilizing the arsenic-containing solid waste treatment system, and comprises the following steps:

starting the rotary furnace, adding arsenic-containing solid waste into the rotary furnace through a first feeding mechanism, igniting and treating;

when the phenomenon of wall sticking and blocking occur in the rotary furnace, the first feeding mechanism is stopped, and arsenic-containing solid waste is added into the rotary furnace from the furnace end of the rotary furnace through the second feeding mechanism, so that the material at the position where the wall sticking and blocking occur is melted.

Compared with the prior art, the invention has the following beneficial effects:

(1) the two ends of the arsenic-containing solid waste treatment system are respectively provided with the feeding mechanism, so that the problem of wall sticking and blockage of materials can be conveniently solved; and the materials can be fed from two ends of the rotary furnace periodically, so that the phenomenon of wall sticking and blocking is prevented, and the treatment effect and efficiency are improved.

(2) At least 1 end of the rotary furnace of the arsenic-containing solid waste treatment system is provided with a step structure, the sealing gap is short, the sealing connection difficulty between the rotary furnace and the sealing cover can be effectively reduced, toxic gas leakage is not easy to cause, and the environmental safety is ensured; in addition, the stepped structure at the furnace end can also improve the retention time of materials in the furnace body, so that the length of the traditional rotary furnace can be greatly shortened.

(3) The rotary furnace of the arsenic-containing solid waste treatment system is shorter in overall length, once the furnace body is blocked by a wall sticking caused by a molten material containing arsenic-containing solid waste, steel rods can be directly inserted from two ends of the furnace, and under the condition that the furnace is not stopped, the steel rods can continuously chisel the wall to clear without hindering production, and the clear can be finished within 20 minutes, so that the phenomenon that the furnace wall is dead is thoroughly solved.

(4) The two ends of the rotary furnace of the arsenic-containing solid waste treatment system can be respectively provided with bottlenecks, and the whole rotary furnace is in a shape with a large middle and small ends, so that the material loading amount of each batch in the furnace body is large, more than about 4 tons, each batch of materials can be fed in within about 20 minutes, the feeding machinery does not need to continuously operate, electricity and manpower are saved, and meanwhile, the rotary furnace only needs to rotate one circle per minute to completely stir and fry the materials in the furnace body, the electricity consumption is low, and the efficiency is high.

(5) The arrangement of the bottlenecks at the two ends of the rotary furnace of the arsenic-containing solid waste treatment system is beneficial to completely removing arsenic from slag, when the slag in the rotary furnace is not completely removed, the rotary furnace can continuously rotate, meanwhile, the slag which is not completely removed with arsenic is blocked by the bottleneck and can never come out, a batch of new materials are fed from the tail of the rotary furnace after the arsenic is completely removed, and the slag which is completely removed with arsenic is extruded out of the rotary furnace until the slag which is completely removed with arsenic is completely extruded.

(6) According to the invention, through the optimized design of the first feeding mechanism, the flue gas leakage risk in the feeding process of the rotary furnace can be effectively improved, and the environment is protected; in addition, two operation processes of smoke exhaust and material feeding can be smoothly carried out, and the normal working operation of the system is effectively guaranteed.

(7) Through the optimization design of the furnace body length, the furnace neck, the feeding at two ends and the like, the structure compactness of the arsenic-containing solid waste treatment system can be improved, the occupied area is reduced, and the high-efficiency and high-quality treatment of the arsenic-containing solid waste is realized.

Drawings

FIG. 1 is a schematic configuration diagram of an arsenic-containing solid waste treatment system according to a first embodiment of the present invention.

Detailed Description

The following description describes alternative embodiments of the invention to teach one of ordinary skill in the art how to make and use the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.

Referring to fig. 1, the arsenic-containing solid waste treatment system comprises a rotary furnace A, wherein the furnace tail of the rotary furnace A is connected with a first sealing cover B4, and the furnace head of the rotary furnace A is connected with a second sealing cover C1; also comprises

The first feeding mechanism is arranged in the first sealing cover B4, and a discharge hole of the first feeding mechanism extends into the rotary furnace A; and

and the second feeding mechanism D is movably arranged on the side of the furnace end of the rotary furnace A and is used for feeding materials from the furnace end of the rotary furnace A into the rotary furnace A. The second feeding mechanism D comprises a feeding trolley D2, a stock bin D1 and a spiral feeder D5 are arranged on the feeding trolley D2, and a feeding hole of the spiral feeder D5 is communicated with a stock bin D1; an access door C3 is arranged on the second sealing cover C1, 4 rollers D3 are arranged at the bottom of the feeding trolley D2, and the rollers D3 are placed on the guide rail D4; the screw feeder D5 has a drive motor D6. When feeding, the discharge port of the spiral feeder D5 sequentially passes through the inlet-outlet door C3 and the furnace end of the rotary furnace A and extends into the rotary furnace A. Second feed mechanism D is portable feeding equipment, appears gluing the stifled stove of wall when the stove tail of rotary furnace, can stop first feed mechanism immediately, stretches into the furnace end section of rotary furnace with second feed mechanism's screw feeder D5's discharge gate, to gluing the opposite side of stifled stove department and adding and contain arsenic and give up admittedly to making contain arsenic and give up useless burning admittedly, giving off the heat, will glue the material melting on the oven, thereby guarantee normal production.

Be equipped with gas vent B3 on the first sealed cowling B4, first feed mechanism includes that the slope sets up first chute B1 and one end in first sealed cowling B4 and stretch into second chute B2 in first sealed cowling B4, the lower extreme of first chute B1 stretches into in rotary furnace A, second chute B2 is inclined downwardly extending to first chute B1 top towards the direction of keeping away from rotary furnace A. The second chute B2 passes through the wall of the first sealing hood B4, and the lower end of the second chute B2 is positioned between the interface position of the second chute B2 and the first sealing hood B4 and the exhaust port B3. In feeding, the first chute B1 receives material from the second chute B2 and feeds the material into the rotary furnace a. Through the cooperation of first chute and second chute for the juncture position of second chute and second sealed cowling is in the position of keeping away from the gas vent, keeps away from main part flue gas runner, thereby reduces the flue gas in the second sealed cowling and spills over the risk from the juncture position of feeding chute and second sealed cowling, eliminates the poison gas and leaks and lead to environmental pollution's hidden danger.

A support B5 is arranged in the first sealing cover B4, and a first chute B1 is placed on the support B5. The lower end of the second chute B2 rests on the first chute B1. The central axis of the first chute B1 and the central axis of the second chute B2 are located in the same vertical plane.

The exhaust port B3 is located on a side wall of the first sealed housing opposite to the end of the rotary furnace a extending into the first sealed housing B4.

The rotary furnace A comprises a cylindrical furnace body A1, one end or two ends of the furnace body A1 are provided with cylindrical furnace necks, the furnace body A1 and the furnace necks share the central axis, the furnace necks extend into the corresponding sealing covers and are movably connected with the sealing covers, the outer diameter of the furnace necks is smaller than that of the furnace body A1, the furnace necks and the furnace body A1 are integrally connected through an annular transition plate A10, and the furnace necks, the transition plate A10 and the furnace body A1 jointly form a ladder structure. Therefore, the whole rotary furnace is in a state that the middle is large and the two ends are small, compared with the traditional straight-barrel rotary furnace, the rotary furnace has the advantages that the material loading capacity of a batch of materials can be actually larger and can reach more than 4t, the feeding of a batch of materials can be completed in about 20min, the feeding mechanism does not need to operate continuously, electricity and manpower are saved, meanwhile, the rotary furnace can completely stir and fry the materials in the rotary furnace by rotating one circle per minute, the electric energy consumption is low, and the efficiency is high. In addition, the arrangement of the bottle necks at the two ends of the furnace body is beneficial to completely removing arsenic from arsenic-containing solid waste, when the slag charge in the rotary furnace is not completely removed, the furnace can continuously rotate, meanwhile, the slag charge without completely removing arsenic is blocked by the bottle necks and can never come out, a batch of new materials are fed from the tail of the furnace after the arsenic is completely removed, and the slag charge without completely removing arsenic is extruded out of the furnace. And continuously until the slag material which is completely removed with arsenic is extruded out.

The rotary furnace A further comprises a driving mechanism A7, a large gear ring A4 sleeved on the furnace body A1, and a furnace head trunnion ring A3 and a furnace tail trunnion ring A2 sleeved on the furnace body A1, wherein the large gear ring A4 is fixedly connected with the furnace body A1, and an output gear of the driving mechanism is in meshing transmission with the large gear ring A4. The furnace head trunnion ring A3 and the furnace tail trunnion ring A2 are positioned on two sides of the large gear ring A4. The bottom of the furnace end trunnion ring A3 is provided with 2 furnace end trunnion wheels A6 for placing the furnace end trunnion ring, and the bottom of the furnace end trunnion ring A2 is provided with 2 furnace end trunnion wheels A5 for placing the furnace end trunnion ring.

One end of the furnace body A1, which is close to the furnace end, is provided with a first furnace neck A8, and one end of the furnace body A1, which is close to the furnace tail, is provided with a second furnace neck A9. The length of the furnace body A1 is 15 m; the length of the furnace neck is 0.5 m. The outer diameter of the furnace body A1 is 2.5 m; the outer diameter of the furnace neck is 0.8m, the circumference of a sealing gap between the furnace neck and the sealing cover is short, toxic gas leakage is not easy to cause, and the environmental safety is ensured. Adopt than the shorter furnace body of traditional rotary furnace, when appearing gluing wall blocking phenomenon, can conveniently adopt the drill rod to directly alternate into from the both ends of rotary furnace, under the incessant rotation of rotary furnace, make a round trip to chisel the wall through the drill rod and clear and lead to incessantly, do not hinder production, can wash unblocked in 20 minutes, thoroughly solve and glue the dead stove phenomenon of wall.

An opening for one end of the rotary furnace to extend into is arranged on one side wall of the second sealing cover C1, the first bottleneck A8 extends into the second sealing cover through the opening and is movably connected with the second sealing cover, an observation hole C2 is arranged on the other side wall of the second sealing cover C1, and optionally, the observation hole C2 is sealed by transparent glass, so that the operation condition in the furnace body can be observed through the observation hole; the second sealing cover C1 is also provided with a combustion valve C4, and the bottom space of the second sealing cover C1 is used as a slag storage groove C5. The access door C3 is arranged on the side wall of the second sealing cover C1 opposite to the rotary furnace, so that the spiral feeder D5 can conveniently penetrate through the feeding port and extend into the rotary furnace, and spiral feeding is realized.

The rotary furnace is inclined from the furnace tail to the furnace head, and the inclination angle is 4 degrees.

The arsenic-containing solid waste treatment method is carried out by utilizing the arsenic-containing solid waste treatment system, and comprises the following steps:

starting the rotary furnace A, adding arsenic-containing solid waste into the rotary furnace A1 through a first feeding mechanism, igniting and treating;

when the phenomenon of wall sticking and blocking appear in the rotary furnace A, the first feeding mechanism is stopped, and arsenic-containing solid waste is added into the rotary furnace A from the furnace end of the rotary furnace A through the second feeding mechanism D, so that the material at the position where the wall sticking and blocking appear is melted.

The applicant believes that the arsenic-containing solid waste treatment system and method provided by the invention are relatively advanced arsenic treatment technologies at home and abroad at present, the hidden danger of environmental pollution in arsenic trioxide production treatment work is eliminated, energy conservation and emission reduction are realized, the production benefit can be improved, and a brand-new step is provided for the arsenic-containing solid waste treatment technology.

The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.

Claims (9)

1. A solid waste treatment system containing arsenic comprises a rotary furnace (A), wherein the tail of the rotary furnace (A) is connected with a first sealing cover (B4), the head of the rotary furnace (A) is connected with a second sealing cover (C1), and an exhaust port (B3) is arranged on the first sealing cover (B4); the device is characterized by further comprising a first feeding mechanism and a second feeding mechanism (D), wherein the first feeding mechanism comprises a first chute (B1) obliquely arranged in a first sealing cover (B4) and a second chute (B2) with one end extending into the first sealing cover (B4), the lower end of the first chute (B1) extends into the rotary furnace (A), and the second chute (B2) obliquely extends downwards to the position above the first chute (B1) towards the direction far away from the rotary furnace (A); the second chute (B2) penetrates through the wall of the first sealing cover (B4), and the lower end of the second chute (B2) is positioned between the interface position of the second chute (B2) and the first sealing cover (B4) and the exhaust port (B3); when fed by the first feeding mechanism, the first chute (B1) receives the material from the second chute (B2) and feeds the material into the rotary furnace (A);

the second feeding mechanism (D) comprises a feeding trolley (D2), a storage bin (D1) and a spiral feeder (D5) are arranged on the feeding trolley (D2), and a feeding hole of the spiral feeder (D5) is communicated with the storage bin (D1); an access door (C3) is arranged on the second sealing cover (C1); when the material is fed through the second feeding mechanism (D), the discharge hole of the spiral feeding machine (D5) sequentially penetrates through the inlet and outlet door (C3) and the furnace end of the rotary furnace (A) and extends into the rotary furnace (A).

2. The arsenic-containing solid waste treatment system according to claim 1, further comprising a guide rail (D4), wherein the feeding trolley (D2) is arranged on the guide rail (D4).

3. The arsenic-containing solid waste treatment system according to claim 1, wherein the rotary furnace (a) comprises a cylindrical furnace body (a 1), one end or both ends of the furnace body (a 1) are provided with cylindrical furnace necks, the furnace body (a 1) and the furnace necks share a central axis, the furnace necks extend into the corresponding sealing covers and are movably connected with the sealing covers, the outer diameter of the furnace necks is smaller than that of the furnace body (a 1), the furnace necks and the furnace body (a 1) are integrally connected through an annular transition plate (a 10), and the furnace necks, the transition plate (a 10) and the furnace body (a 1) form a stepped structure together.

4. The arsenic-containing solid waste treatment system according to claim 3, wherein the furnace body (A1) is provided with a first furnace neck (A8) at the end close to the furnace head, and a second furnace neck (A9) at the end close to the furnace tail of the furnace body (A1).

5. The arsenic-containing solid waste treatment system according to claim 3, wherein the length of the furnace body (A1) is 14-16 m.

6. The arsenic-containing solid waste treatment system according to claim 4, wherein the length of the furnace neck is 0.2-0.8 m.

7. The arsenic-containing solid waste treatment system according to any one of claims 1 to 6, wherein the rotary furnace (A) is inclined downward from the furnace tail to the furnace head.

8. The arsenic-containing solid waste treatment system according to claim 7, wherein the angle of inclination of the rotary furnace (A) is 3-5 °.

9. A method for treating arsenic-containing solid waste, which is carried out by using the arsenic-containing solid waste treatment system according to any one of claims 1 to 8, and which comprises the steps of:

starting the rotary furnace (A), adding arsenic-containing solid waste into the rotary furnace (A1) through a first feeding mechanism, igniting and treating;

when the phenomenon of wall sticking and blocking occur in the rotary furnace (A), the first feeding mechanism is stopped, and arsenic-containing solid waste is added into the rotary furnace (A) from the furnace end of the rotary furnace (A) through the second feeding mechanism (D), so that the material at the wall sticking and blocking position is melted.

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