Arsenic trioxide purification treatment equipment

Abstract

The utility model provides arsenic trioxide purification treatment equipment which comprises a purification furnace, the purification furnace is provided with a first inlet and a first outlet, and the purification furnace is used for purifying coarse arsenic trioxide in the purification furnace to obtain purified flue gas; the sedimentation device is communicated with the purification furnace through a first inlet and is used for carrying out sedimentation treatment on the purified flue gas entering the inner cavity of the sedimentation device so as to obtain sedimentation flue gas; the cooling device is communicated with the settling device and is used for reducing the temperature of settling flue gas flowing into the cooling device from the inner cavity of the settling device to a second preset temperature so as to obtain arsenic trioxide crystals. According to the present invention, with the equipment, the problem that the arsenic trioxide product content in the product is not stable due to the fact that the arsenic trioxide product content is not stable is solved, and the purity of the obtained arsenic trioxide is high and can achieve 99.5%.

Description

TECHNICAL FIELD

[0001] The utility model relates to arsenic trioxide post treatment technical field, specifically, relate to a kind of arsenic trioxide purification treatment equipment. BACKGROUND

[0002] Arsenic trioxide is one of by-products in gold smelting and copper smelting process, arsenic trioxide product is generally produced using pyrogenic process purification.

[0003] At present, arsenic trioxide is cooled and crystallized after being collected and smoke treatment in arsenic-containing flue gas of pyrogenic process furnace is often ignored, and in prior art, electric furnace heating and water cooling are generally used to collect, but the qualified rate of arsenic trioxide product obtained by this method is low, and the impurities are more, so that the purity and whiteness of arsenic trioxide do not meet the standard, and the water cooling method is used for cooling, easy to block, and difficult to maintain. INVENTION CONTENTS

[0004] The main purpose of the utility model is to provide a kind of arsenic trioxide purification treatment equipment, to solve the problem of unstable content of arsenic trioxide product in product in prior art using electric furnace heating and water cooling.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a kind of arsenic trioxide purification treatment equipment is provided, comprising:

[0006] Purification furnace, purification furnace has first import and first export, purification furnace is used to purify the crude arsenic trioxide in its for purification operation, to obtain purification flue gas;

[0007] Sedimentation device, sedimentation device is communicated with purification furnace by first import, for the sedimentation treatment of purification flue gas into the inner chamber of sedimentation device, to obtain sedimentation flue gas;

[0008] Cooling device, cooling device is communicated with sedimentation device, for reducing the temperature of sedimentation flue gas to second preset temperature by the inner chamber of sedimentation device to obtain arsenic trioxide crystal.

[0009] Further, the sedimentation device further comprises: sedimentation chamber, the sedimentation chamber is communicated with the purification furnace by the first import;

[0010] First collection device, first collection device includes a plurality of first collection bucket arranged along horizontal direction, each first collection bucket is communicated with sedimentation chamber and is located below sedimentation chamber, for collecting product system obtained after sedimentation from sedimentation chamber.

[0011] Further, the first collection bucket is conical, the large end of the first collection bucket is communicated with the sedimentation chamber, and the included angle formed by the generatrix of the first collection bucket and the plane where the small diameter end of the first collection bucket is located is a first preset included angle.

[0012] Further, the cooling device further comprises a cooling chamber, the cooling chamber being in communication with the settling device.

[0013] A second collecting device, the second collecting device comprising a plurality of second collecting buckets arranged along a horizontal direction, each of the second collecting buckets being in communication with the cooling chamber and being located below the cooling chamber, and being used for collecting the product system after being cooled by the cooling chamber.

[0014] Further, the second collecting bucket is conical, a large-diameter end of the second collecting bucket is in communication with the cooling chamber, and an included angle formed between a generatrix of the second collecting bucket and a plane where a small-diameter end of the second collecting bucket is located is a second preset included angle.

[0015] Further, the cooling device further comprises a plurality of cooling chambers, the plurality of cooling chambers being arranged along the horizontal direction, and each of the cooling chambers being in communication with one of the second collecting buckets.

[0016] Further, a plurality of first flow guides are arranged in the cooling chamber, one end of each of the first flow guides is connected to a first inner side wall of the cooling chamber, and the other end of each of the first flow guides is arranged in a gap with a first plane, the first plane being a plane where the large-diameter end of the second collecting bucket is located.

[0017] Further, a plurality of second flow guides are arranged on the first plane, a free end of each of the second flow guides is arranged in a gap with the first inner side wall of the cooling chamber, and the plurality of second flow guides and the plurality of first flow guides are arranged in the chamber of the cooling chamber in a staggered manner along the horizontal direction.

[0018] Further, the cooling device further comprises a plurality of cooling chambers, the plurality of cooling chambers being divided into a first cooling chamber group and a second cooling chamber group, the first cooling chamber group comprising a plurality of cooling chambers arranged along a first direction, and the second cooling chamber group comprising a plurality of cooling chambers arranged along a second direction; wherein each of the cooling chambers in the first cooling chamber group and each of the cooling chambers in the second cooling chamber group are correspondingly provided with a second collecting bucket in communication therewith below; and wherein the first direction is perpendicular to the second direction.

[0019] Further, each of the cooling chambers in the first cooling chamber group is provided with a third flow guide, one end of the third flow guide is connected to a second inner side wall of the cooling chamber, and the other end of the third flow guide is arranged in a gap with a second plane, the second plane being a plane where the large-diameter end of the second collecting bucket is located; and each of the cooling chambers in the second cooling chamber group is provided with a fourth flow guide, one end of the fourth flow guide is connected to a third inner side wall of the cooling chamber, and the other end of the fourth flow guide is arranged in a gap with a fourth inner side wall of the cooling chamber, the third inner side wall and the fourth inner side wall being oppositely arranged.

[0020] Further, the material of the settling chamber and the first collecting device is carbon steel, and the inner wall of the settling chamber and the inner wall of the first collecting device are provided with a refractory castable layer or a refractory brick.

[0021] Furthermore, the purification equipment also includes a desulfurization unit, which is connected to a cooling unit. The desulfurization unit is used to desulfurize the product system from the cooling unit using alkaline solution as a desulfurizing agent to obtain desulfurized products.

[0022] Furthermore, the purification equipment also includes a wet scrubber, which is connected to the desulfurization unit and is used to remove particulate matter from the desulfurization products.

[0023] The smoke exhaust device is connected to the wet scrubber and is used to discharge the product system of the wet scrubber.

[0024] Furthermore, the purification and processing equipment also includes: a transport device, which is located below the second collection device and is used to transport the product system obtained from the second collection device;

[0025] Packaging equipment, connected to the transport equipment, is used to collect and package the product system output by the transport equipment.

[0026] Furthermore, the desulfurization device includes: a desulfurization unit, which is connected to the settling chamber and is used to desulfurize the product system obtained in the settling chamber;

[0027] The cooling unit is connected to the desulfurization unit and is used to deliver a cooling medium into the settling chamber during the desulfurization process in the desulfurization unit to cool the product system in the settling chamber.

[0028] Furthermore, the desulfurizing agent is any one of sodium hydroxide, sodium carbonate, or sodium bicarbonate.

[0029] By applying the technical solution of this utility model and the technical solution of this application, crude arsenic trioxide is first heated in a purification furnace to obtain purified flue gas. The purified flue gas is then fed into a settling device to fully burn the unburned substances contained in the purified flue gas. At the same time, large particulate impurities in the purified flue gas settle in the settling device to achieve preliminary purification of the purified flue gas, resulting in settled flue gas. The settled flue gas is then fed into a cooling device to cool it, thereby obtaining arsenic trioxide crystals.

[0030] Compared with existing technologies, the arsenic trioxide purification equipment provided in this application effectively improves the purity of arsenic trioxide products. Through reasonable purification and sedimentation steps, the residual impurities are reduced, making the chemical composition of the product purer. The process flow of this application helps to remove impurities that affect color, giving the product better appearance quality. Furthermore, a series of improvements from purification to cooling enable the produced arsenic trioxide crystals to achieve high and stable levels in key indicators such as purity, content, and whiteness. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0032] Fig. 1 A schematic diagram of the purification equipment in an embodiment of this application is shown;

[0033] Fig. 2 A schematic diagram showing the cooling chambers arranged in a straight line is shown;

[0034] Fig. 3 A schematic diagram showing the L-shaped arrangement of the cooling chambers in an embodiment of this application is shown.

[0035] The above figures include the following reference numerals:

[0036] 1. Purification furnace; 101. First inlet; 102. First outlet; 2. Settling device; 201. Settling chamber; 202. First collection hopper; 3. Cooling device; 301. Cooling chamber; 302. Second collection hopper; 4. Baffle plate; 5. Desulfurization device; 501. Desulfurization unit; 502. Cooling unit; 6. Wet dust collector; 7. Exhaust device; 8. Conveying device; 9. Packaging device; 10. Fan; 11. Second baffle plate; 12. Third baffle plate; 13. Fourth baffle plate. Detailed Implementation

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Arsenic trioxide is a byproduct of gold and copper smelting. Arsenic-containing flue gas produced by roasting gold concentrate or smelting copper is cooled in a quench tower to obtain crude arsenic trioxide dust, which is generally purified by pyrometallurgical processes.

[0039] Currently, the collection and treatment of arsenic trioxide after cooling and crystallization in arsenic-containing flue gas from pyrometallurgical processes are often overlooked. Due to unreasonable design of subsequent cooling equipment, the arsenic trioxide content in the product is unstable. The flue gas contains harmful substances such as arsenic and sulfur, which need to be removed. Traditional flue gas treatment requires equipment such as bag filters, wet desulfurization towers, and electrostatic precipitators. The process is long and the equipment is complex. Since arsenic trioxide is toxic, the health of workers is also harmed during product transportation, packaging, and equipment maintenance such as filter bag replacement.

[0040] The collected arsenic trioxide has low purity and whiteness, making it unsuitable for direct use as a product. Purification is necessary. Crude arsenic trioxide is purified by heating it above its boiling point in a specific furnace, causing it to volatilize and enter the flue gas. After cooling, higher purity arsenic trioxide is obtained. Currently, the main furnaces for purifying crude arsenic trioxide are reverberatory furnaces, rotary kilns, and steel belt furnaces. For these three pyrometallurgical purification processes, there has been considerable development and design optimization of furnace types, and the processes are relatively mature. However, the collection of arsenic trioxide after cooling and crystallization from the arsenic-containing flue gas and the treatment of arsenic- and sulfur-containing flue gas are often overlooked. Due to unreasonable design of the subsequent cooling and crystallization equipment, the quality of the arsenic trioxide product is unstable, with many impurities, and the purity and whiteness do not meet standards. Flue gas contains harmful substances such as arsenic and sulfur. Traditional flue gas treatment uses a combination of bag filters and wet desulfurization. Arsenic trioxide easily forms glassy arsenic that clogs the filter bags, significantly shortening their lifespan. Wet desulfurization also requires a wet electrostatic precipitator to ensure particulate matter emissions meet standards, prolonging the flue gas treatment process and complicating the equipment. Furthermore, due to the toxicity of arsenic trioxide, the transportation, packaging, and filter bag replacement processes pose health risks to workers.

[0041] Therefore, the purpose of this application is to provide an arsenic trioxide purification and treatment device to address the above problems. The purification and treatment device includes:

[0042] Purification furnace 1 has a first inlet 101 and a first outlet 102. Purification furnace 1 is used to purify crude arsenic trioxide inside it to obtain purified flue gas.

[0043] The settling device 2 is connected to the purification furnace 1 through the first inlet 101 and is used to settling the purification flue gas entering the inner cavity of the settling device 2 to obtain settling flue gas.

[0044] Cooling device 3 is connected to settling device 2 and is used to reduce the temperature of the settling flue gas flowing from the inner cavity of settling device 2 into cooling device 3 to a second preset temperature in order to obtain arsenic trioxide crystals.

[0045] When using it, such as Figs. 1 to 3As shown, the generated crude arsenic trioxide enters the purification furnace 1 through the first inlet 101 and volatilizes into flue gas to obtain purified flue gas. At this time, the temperature of the purified flue gas is 600°C. The purified flue gas enters the settling device 2 through the first outlet 102, where the flow rate slows down. Unburned substances in the purified flue gas are fully burned in the settling device 2, while large particles of impurities are precipitated in the settling device 2. At this time, the purified flue gas is initially purified and settling flue gas is obtained. The temperature of the settling flue gas is 400°C to 450°C. The settling flue gas is then introduced into the cooling device 3. The cooling device 3 is used to reduce the current temperature of the settling flue gas to a second preset temperature. In this embodiment, the second preset temperature is 130°C to 160°C. The settling flue gas gradually changes from a gaseous state to a solid crystal, that is, arsenic trioxide crystals are obtained.

[0046] By applying the technical solution of this application, crude arsenic trioxide is first heated in a purification furnace 1 to obtain purified flue gas. The purified flue gas is then fed into a settling device 2 to fully combust any unburned substances contained in the purified flue gas. At the same time, large particulate impurities in the purified flue gas settle in the settling device 2 to achieve preliminary purification of the purified flue gas, resulting in settled flue gas. The settled flue gas is then fed into a cooling device 3 to cool it, thereby obtaining arsenic trioxide crystals.

[0047] Compared with existing technologies, the arsenic trioxide purification equipment provided in this application effectively improves the purity of arsenic trioxide products. Through reasonable purification and sedimentation steps, the residual impurities are reduced, making the chemical composition of the product purer. The process flow of this application helps to remove impurities that affect color, giving the product better appearance quality. Furthermore, a series of improvements from purification to cooling enable the produced arsenic trioxide crystals to achieve high and stable levels in key indicators such as purity, content, and whiteness.

[0048] Furthermore, the settling device 2 also includes a settling chamber 201, which is connected to the purification furnace 1 through a first inlet 101;

[0049] The first collection device includes a plurality of first collection hoppers 202 arranged in a horizontal direction. Each first collection hopper 202 is connected to a settling chamber 201 and is located below the settling chamber 201, and is used to collect the product system obtained after settling from the settling chamber 201.

[0050] By providing a settling chamber 201, large particulate impurities in the purified flue gas can settle in the settling chamber 201 and fall into the first collection device, which collects the large particulate impurities, thus preventing them from falling into the environment and causing harm.

[0051] Furthermore, the first collecting hopper 202 is conical in shape, and the large end of the first collecting hopper 202 is connected to the settling chamber 201. The angle formed by the generatrix of the first collecting hopper 202 and the plane containing its small-diameter end is a first preset angle.

[0052] The first collecting hopper 202 is conical in shape. The large-diameter end of the first collecting hopper 202 is connected to the settling chamber 201, and the small-diameter end of the first collecting hopper 202 forms a first plane. The angle between the generatrix of the first collecting hopper 202 and the first plane is 62 degrees, which is conducive to the smooth entry of large particles of impurities into the bottom of the first collecting hopper 202. In this process, large particles of impurities will not adhere to the inner wall of the first collecting hopper 202.

[0053] Furthermore, the cooling device 3 also includes a cooling chamber 301, which is connected to the settling device 2;

[0054] The second collection device includes a plurality of second collection hoppers 302 arranged in a horizontal direction. Each second collection hopper 302 is connected to the cooling chamber 301 and is located below the cooling chamber 301, for collecting the product system after cooling from the cooling chamber 301.

[0055] A second collection device is provided below the cooling chamber 301. The second collection device includes a plurality of second collection hoppers 302 arranged in a horizontal direction. The second collection hoppers 302 are used to collect the product system after cooling from the cooling chamber 301.

[0056] Furthermore, the second collecting hopper 302 is conical in shape, and the large-diameter end of the second collecting hopper 302 is connected to the cooling chamber 301. The angle formed by the generatrix of the second collecting hopper 302 and the plane containing its small-diameter end is a second preset angle.

[0057] The second collecting hopper 302 is conical in shape. The large-diameter end of the second collecting hopper 302 is connected to the cooling chamber 301, and the small-diameter end of the second collecting hopper 302 forms a second plane. The angle between the generatrix of the second collecting hopper 302 and the second plane is 62 degrees, which is conducive to the smooth entry of the cooled product system into the bottom of the second collecting hopper 302. In this process, the product system of the cooling chamber 301 will not adhere to the inner wall of the second collecting hopper 302.

[0058] Furthermore, there are multiple cooling chambers 301, all of which are arranged horizontally, and each cooling chamber 301 is connected to a second collection hopper 302.

[0059] Furthermore, a plurality of first guide plates 4 are provided in the cooling chamber 301. One end of each first guide plate 4 is connected to the first inner sidewall of the cooling chamber 301, and the other end of each first guide plate 4 is spaced apart from the first plane, which is the plane where the large diameter end of the second collection hopper 302 is located.

[0060] By providing multiple cooling chambers 301, and in each cooling chamber 301 providing multiple first guide plates 4, the multiple first guide plates 4 can be arranged at equal intervals in the inner cavity of the cooling chamber 301, or they can be arranged at unequal intervals in the inner cavity of the cooling chamber 301. One end of each first guide plate 4 is connected to the first inner side wall of the cooling chamber 301, and the other end of each first guide plate 4 is separated from the first plane. The first plane is the plane where the large-diameter end of the second collection hopper 302 is located. Each cooling chamber 301 is connected to a second collection hopper 302 at the bottom. The purpose is to prolong the residence time of the flue gas in the cooling chamber 301, so as to maximize the settling of arsenic trioxide in the flue gas and increase the yield and quality of arsenic trioxide crystals.

[0061] Furthermore, a plurality of second guide plates 11 are provided on the first plane, and the free end of each second guide plate 11 is spaced apart from the first inner wall of the cooling chamber 301. The plurality of second guide plates 11 and the plurality of first guide plates 4 are staggered in the horizontal direction in the chamber of the cooling chamber 301.

[0062] By providing multiple second guide plates 11 on the first plane, and having the multiple second guide plates 11 and the first guide plate 4 staggered in the horizontal direction in the chamber of the cooling chamber 301, the residence time of the settling flue gas in the cooling chamber 301 can be further extended, thereby precipitating arsenic trioxide in the settling flue gas as much as possible, so as to increase the yield and quality of arsenic trioxide crystals.

[0063] Furthermore, there are multiple cooling chambers 301, which are divided into a first cooling chamber group and a second cooling chamber group. The first cooling chamber group includes multiple cooling chambers 301 arranged along a first direction, and the second cooling chamber group includes multiple cooling chambers 301 arranged along a second direction. Each cooling chamber 301 in the first cooling chamber group and each cooling chamber 301 in the second cooling chamber group is provided with a second collection hopper 302 below it, which is connected to it. The first direction is perpendicular to the second direction.

[0064] Each cooling chamber 301 in the first cooling chamber group is provided with a third guide plate 12. One end of the third guide plate 12 is connected to the second inner side wall of the cooling chamber 301, and the other end of the third guide plate 12 is spaced apart from the second plane. The second plane is the plane where the large diameter end of the second collection hopper 302 is located. Each cooling chamber 301 in the second cooling chamber group is provided with a fourth guide plate 13. One end of the fourth guide plate 13 is connected to the third inner side wall of the cooling chamber 301, and the other end of the fourth guide plate 13 is spaced apart from the fourth inner side wall of the cooling chamber 301. The third inner side wall and the fourth inner side wall are arranged opposite to each other.

[0065] The first and second cooling chamber groups together present an L-shape. By setting multiple cooling chambers 301 in an L-shape, and by providing a third guide plate 12 and a fourth guide plate 13, the residence time of the settled flue gas in the cooling chamber 301 can be increased, thereby increasing the yield and quality of arsenic trioxide crystals.

[0066] Furthermore, both the settling chamber 201 and the first collecting device are made of carbon steel, and the inner walls of both the settling chamber 201 and the first collecting device are provided with a refractory castable layer or refractory bricks.

[0067] By providing refractory castable or refractory bricks on the inner walls of the settling chamber 201 and the first collecting device, in this embodiment, high-alumina refractory castable or high-alumina refractory bricks with alumina as the main material are selected. Among them, the refractory castable material is relatively inexpensive, and the refractory brick material is easy to construct. By providing refractory castable or refractory bricks on the inner wall of the first collecting device, it can withstand the high temperature during the settling process, prevent the inner wall from deforming or being damaged due to high temperature, and ensure the stability and integrity of the structure in the settling chamber 201 and the first collecting device. At the same time, it can also effectively resist the scouring and abrasion of particulate matter in the settling flue gas, extend the service life of the settling chamber 201 and the first collecting device, and resist the erosion and corrosion of chemical substances in the flue gas, maintaining the performance and structural stability of the inner wall. In addition, the settling chamber 201 and the first collecting device are made of carbon steel, which can ensure that the settling chamber 201 and the first collecting device have high strength and can withstand the pressure and mechanical stress in the settling chamber 201, ensuring the stability and safety of the structure.

[0068] Furthermore, the purification equipment also includes a desulfurization device 5, which is connected to the cooling device 3. The desulfurization device 5 is used to desulfurize the product system from the cooling device 3 using alkaline solution as a desulfurizing agent to obtain desulfurized products.

[0069] The desulfurizing agent is any one of sodium hydroxide, sodium carbonate, or sodium bicarbonate, preferably sodium hydroxide.

[0070] Using alkaline solution as a desulfurizing agent can improve desulfurization efficiency. Alkaline solution has strong alkalinity and can more effectively absorb sulfur dioxide, metal particulate matter, and residual arsenic in flue gas. Compared with other desulfurizing agents, alkaline solution is relatively inexpensive, which can effectively reduce operating costs. At the same time, the products generated after the reaction of alkaline solution with sulfur dioxide have high solubility and are less likely to form waste residue, reducing the cost of waste residue treatment and disposal. In this application, sodium hydroxide with a mass concentration of 5% is selected as the desulfurizing agent. Sodium hydroxide is a strong alkali and can effectively absorb sulfur dioxide, thereby improving desulfurization efficiency.

[0071] Furthermore, the purification equipment also includes a wet dust collector 6, which is connected to the desulfurization unit 5 and is used to remove particulate matter from the desulfurization products.

[0072] The smoke exhaust device 7 is connected to the wet dust collector 6 and is used to discharge the product system of the wet dust collector 6.

[0073] By providing a wet dust collector 6, particulate matter in the desulfurization products can be removed. The product system in the wet dust collector 6 can be discharged to the outside through the exhaust device 7. In this embodiment, the exhaust device 7 is a chimney.

[0074] Furthermore, the purification and processing equipment also includes: a transport device 8, which is located below the second collection device and is used to transport the product system obtained from the second collection device;

[0075] Packaging device 9, which is connected to transport device 8, is used to collect and package the product system output by transport device 8.

[0076] The product system collected by the second collecting device enters the transport device 8 directly. The transport device 8 then transports the product system to the packaging device 9, where it is collected and packaged. The second collecting device and the transport device 8, as well as the transport device 8 and the packaging device 9, are all sealed together to form a fully sealed structure, preventing dust leakage. The entire process is fully automated, eliminating the need for direct contact between humans and arsenic trioxide, thus avoiding its harm to the human body.

[0077] Furthermore, the desulfurization device 5 includes: a desulfurization unit 501, which is connected to the settling chamber 201 and is used to desulfurize the product system obtained in the settling chamber 201.

[0078] Cooling unit 502 is connected to desulfurization unit 501 and is used to deliver cooling medium into settling chamber 201 during the desulfurization process in desulfurization unit 501 in order to cool the product system in settling chamber 201.

[0079] The desulfurization unit 501 uses eight dual-fluid physicochemical spray guns, and the cooling unit 502 uses industrial circulating water as the medium, which can cool the product system in the settling chamber 201 during the desulfurization process.

[0080] Example 1

[0081] The generated crude arsenic trioxide is fed into purification furnace 1 through the first inlet 101 for purification. In purification furnace 1, the crude arsenic trioxide is heated to form purification flue gas. The temperature of the purification flue gas is 600℃, and the dust content in the purification flue gas is approximately 10 g / Nm³. 3 SO2 is approximately 400 mg / Nm³ 3 Crude arsenic trioxide enters the settling chamber 201 along with the purified flue gas. The settling chamber measures 9000mm * 4000mm * 6000mm (length * width * height). A single layer of corundum refractory bricks is installed on the inner wall of the settling chamber 201. The first collecting hopper 202, located below the settling chamber 201, has an inclination angle of 62 degrees (the inclination angle is the angle between the plane formed by the small-diameter end of the first collecting hopper 202 and the generatrix of the first collecting hopper 202). Within this range, large unburned particles in the purified flue gas can be... The flue gas is collected by the first collection bucket 202, where it undergoes preliminary purification. The temperature of the flue gas decreases to 400°C to 450°C. The arsenic trioxide-rich flue gas then enters the cooling chambers 301, arranged in a straight line or L-shape. Multiple first guide plates 4 are installed in the cooling chambers 301 to cool the flue gas, causing its temperature to slowly decrease to 130°C to 160°C. The cooling chambers have a capacity of 4000 cubic meters per second. The second collection hopper 302, located below the cooling chamber 301 and measuring 4000mm x 3000mm (length x width x height), has an inclination angle of 62 degrees (the angle between the plane formed by the small-diameter end of the second collection hopper 302 and the generatrix of the second collection hopper 302). Arsenic trioxide crystals enter the transport device 8 below from the second collection hopper 302. The transport device 8 transports the arsenic trioxide crystals to the packaging device 9, where the packaging device 9 packages the collected arsenic trioxide crystals. The other end of the settling chamber 201 is also connected to the desulfurization unit 501. The flue gas after removing arsenic trioxide enters the desulfurization unit 501 for desulfurization treatment. The desulfurizing agent is a 5% sodium hydroxide dilute alkaline solution. During the desulfurization process, the cooling unit 502 delivers a cooling medium into the settling chamber 201 to cool the product system in the settling chamber 201 and discharges the final flue gas through the chimney. The purity of the arsenic trioxide product obtained through the embodiments of this application is greater than or equal to 99.5%.

[0082] Example 2

[0083] The generated crude arsenic trioxide is fed into purification furnace 1 through the first inlet 101 for purification. In purification furnace 1, the crude arsenic trioxide is heated to form purification flue gas. The temperature of the purification flue gas is 350℃-400℃, and the dust content in the purification flue gas is approximately 8g / Nm³. 3 SO2 is approximately 300 mg / Nm³ 3 Crude arsenic trioxide enters the settling chamber 201 along with the purified flue gas. The settling chamber has dimensions of 4000mm*3000mm*3000mm (length*width*height). A single layer of refractory castable is provided on the inner wall of the settling chamber 201. The first collecting hopper 202 located below the settling chamber 201 has an inclination angle of 63 degrees (the inclination angle is the angle between the plane formed by the small-diameter end of the first collecting hopper 202 and the generatrix of the first collecting hopper 202). Within this range, large unburned particles in the purified flue gas can be collected by the first collecting hopper 202. At this point, the purified flue gas is initially purified, and its temperature drops to 300℃. The arsenic trioxide-rich settling flue gas then sequentially enters the cooling chamber 301, which is arranged in a straight line or an L-shape (e.g., ...). Fig. 3 As shown in the top view (which presents an L-shape) of multiple cooling chambers 301, each cooling chamber 301 is equipped with multiple first guide plates 4, which cool the settling flue gas. The temperature of the settling flue gas is slowly reduced to 140℃ to 160℃. The dimensions of the cooling chamber are 3000mm*3000mm*3000mm (length*width*height). The inclination angle of the second collection hopper 302 located below the cooling chamber 301 (the inclination angle is the angle between the plane formed by the small diameter end of the second collection hopper 302 and the generatrix of the second collection hopper 302) is 62 degrees. Arsenic trioxide crystals enter the conveying device 8 below from the second collection hopper 302. Arsenic trioxide crystals are transported by transport device 8 to packaging device 9, where they are packaged. Simultaneously, the other end of settling chamber 201 is connected to desulfurization unit 501. The flue gas from which arsenic trioxide has been removed enters desulfurization unit 501 for desulfurization treatment. The desulfurizing agent is a 5% sodium hydroxide dilute alkaline solution. During desulfurization, cooling unit 502 delivers cooling medium into settling chamber 201 to cool the product system within the settling chamber 201, and the final flue gas is discharged through a chimney. The purity of the arsenic trioxide product obtained through this application embodiment is greater than or equal to 99.9%.

[0084] The arsenic trioxide purification equipment provided in this application includes a purification furnace 1. Crude arsenic trioxide enters the purification furnace 1 through a first inlet 101 for purification, resulting in purified flue gas. The purified flue gas enters a straight or L-shaped settling chamber 201 through a first outlet 102. The settling chamber 201 settles the purified flue gas within its cavity to remove large particulate impurities as much as possible. During the settling process in the settling chamber 201, large particulate impurities are collected in a first collection hopper 202. The collected flue gas then enters a cooling chamber 301, where it is cooled to a second preset temperature, resulting in arsenic trioxide crystals. The arsenic trioxide crystals enter the second collection hopper 302 and then flow into the transport device 8. The transport device 8 transports the obtained arsenic trioxide crystals to the packaging device 9, where the packaging device 9 collects and packages the arsenic trioxide crystals. Meanwhile, the other end of the settling chamber 201 is connected to a desulfurization unit 501. The desulfurization unit 501 sprays sodium hydroxide solution into the settling chamber 201 to desulfurize the product system obtained in the settling chamber 201. During the desulfurization process, the cooling unit 502 delivers a cooling medium into the settling chamber 201 to cool the product system in the settling chamber 201. The cooling medium is industrial water. A fan 10 is also provided between the desulfurization device 5 and the cooling chamber 301. The fan 10 is used to transport the product system in the cooling chamber 301 to the desulfurization device 5 for desulfurization and discharge the desulfurized flue gas from the chimney.

[0085] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0086] By applying the technical solution of this application, crude arsenic trioxide is first heated in a purification furnace 1 to obtain purified flue gas. The purified flue gas is then fed into a settling device 2 to fully combust any unburned substances contained in the purified flue gas. At the same time, large particulate impurities in the purified flue gas settle in the settling device 2 to achieve preliminary purification of the purified flue gas, resulting in settled flue gas. The settled flue gas is then fed into a cooling device 3 to cool it, thereby obtaining arsenic trioxide crystals.

[0087] Compared with existing technologies, the arsenic trioxide purification equipment provided in this application effectively improves the purity of arsenic trioxide products. Through reasonable purification and sedimentation steps, the residual impurities are reduced, making the chemical composition of the product purer. The process flow of this application helps to remove impurities that affect color, giving the product better appearance quality. Furthermore, a series of improvements from purification to cooling enable the produced arsenic trioxide crystals to achieve high and stable levels in key indicators such as purity, content, and whiteness.

[0088] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0089] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0090] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0091] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0092] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0093] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An arsenic trioxide purification and treatment device, characterized in that, include: Purification furnace (1), the purification furnace (1) having a first inlet (101) and a first outlet (102), the purification furnace (1) being used to purify crude arsenic trioxide contained therein to obtain purified flue gas; A settling device (2) is connected to the purification furnace (1) through the first inlet (101) and is used to settling the purification flue gas that enters the inner cavity of the settling device (2) to obtain settling flue gas. Cooling device (3), which is connected to settling device (2), is used to reduce the temperature of the settling flue gas flowing from the inner cavity of settling device (2) to the cooling device (3) to a second preset temperature in order to obtain arsenic trioxide crystals.

2. The arsenic trioxide purification and treatment equipment according to claim 1, characterized in that, The settling device (2) also includes: A settling chamber (201) is connected to the purification furnace (1) through the first inlet (101); The first collection device includes a plurality of first collection hoppers (202) arranged in a horizontal direction. Each of the first collection hoppers (202) is connected to the settling chamber (201) and is located below the settling chamber (201) for collecting the product system obtained after settling from the settling chamber (201).

3. The arsenic trioxide purification equipment according to claim 2, characterized in that, The first collecting hopper (202) is conical in shape. The large end of the first collecting hopper (202) is connected to the settling chamber (201). The angle formed by the generatrix of the first collecting hopper (202) and the plane containing its small diameter end is a first preset angle.

4. The arsenic trioxide purification and treatment equipment according to claim 3, characterized in that, The cooling device (3) further includes: Cooling chamber (301), which is connected to the settling device (2); The second collection device includes a plurality of second collection hoppers (302) arranged in a horizontal direction. Each second collection hopper (302) is connected to the cooling chamber (301) and is located below the cooling chamber (301) for collecting the product system after cooling from the cooling chamber (301).

5. The arsenic trioxide purification and treatment equipment according to claim 4, characterized in that, The second collecting hopper (302) is conical in shape. The large-diameter end of the second collecting hopper (302) is connected to the cooling chamber (301). The angle formed by the generatrix of the second collecting hopper (302) and the plane containing its small-diameter end is a second preset angle.

6. The arsenic trioxide purification and treatment equipment according to claim 4, characterized in that, The number of cooling chambers (301) is multiple, and the multiple cooling chambers (301) are arranged along the horizontal direction, and each cooling chamber (301) is connected to a second collection hopper (302).

7. The arsenic trioxide purification equipment according to claim 6, characterized in that, Multiple first guide plates (4) are provided in the cooling chamber (301). One end of each first guide plate (4) is connected to the first inner wall of the cooling chamber (301), and the other end of each first guide plate (4) is spaced apart from the first plane. The first plane is the plane where the large diameter end of the second collection hopper (302) is located.

8. The arsenic trioxide purification equipment according to claim 7, characterized in that, A plurality of second guide plates (11) are provided on the first plane. The free end of each second guide plate (11) is separated from the first inner wall of the cooling chamber (301). The plurality of second guide plates (11) and the plurality of first guide plates (4) are staggered in the horizontal direction in the chamber of the cooling chamber (301).

9. The arsenic trioxide purification and treatment equipment according to claim 4, characterized in that, The number of cooling chambers (301) is multiple, and the multiple cooling chambers (301) are divided into a first cooling chamber group and a second cooling chamber group. The first cooling chamber group includes multiple cooling chambers (301) arranged along a first direction, and the second cooling chamber group includes multiple cooling chambers (301) arranged along a second direction. Each cooling chamber (301) in the first cooling chamber group and each cooling chamber (301) in the second cooling chamber group is provided with a second collection hopper (302) communicating with it below. The first direction is perpendicular to the second direction.

10. The arsenic trioxide purification and treatment equipment according to claim 9, characterized in that, Each cooling chamber (301) in the first cooling chamber group is provided with a third guide plate (12). One end of the third guide plate (12) is connected to the second inner wall of the cooling chamber (301), and the other end of the third guide plate (12) is separated from the second plane. The second plane is the plane where the large diameter end of the second collection hopper (302) is located. Each cooling chamber (301) in the second cooling chamber group is provided with a fourth guide plate (13). One end of the fourth guide plate (13) is connected to the third inner wall of the cooling chamber (301), and the other end of the fourth guide plate (13) is separated from the fourth inner wall of the cooling chamber (301). The third inner wall and the fourth inner wall are arranged opposite to each other.

11. The arsenic trioxide purification and treatment equipment according to claim 2, characterized in that, The settling chamber (201) and the first collecting device are both made of carbon steel, and the inner wall of the settling chamber (201) and the inner wall of the first collecting device are both provided with a refractory castable layer or refractory bricks.

12. The arsenic trioxide purification and treatment equipment according to claim 11, characterized in that, The purification equipment also includes: The desulfurization device (5) is connected to the cooling device (3). The desulfurization device (5) is used to desulfurize the product system from the cooling device (3) using alkaline solution as a desulfurizing agent to obtain desulfurized products.

13. The arsenic trioxide purification and treatment equipment according to claim 12, characterized in that, The purification equipment also includes: A wet dust collector (6) is connected to the desulfurization device (5) and is used to remove particulate matter from the desulfurization products. Smoke exhaust device (7), which is connected to the wet dust collector (6), is used to discharge the product system of the wet dust collector (6).

14. The arsenic trioxide purification and treatment equipment according to claim 4, characterized in that, The purification equipment also includes: A transport device (8) is provided below the second collection device for transporting the product system obtained from the second collection device; Packaging device (9), which is connected to the transport device (8), is used to collect and package the product system output by the transport device (8).

15. The arsenic trioxide purification and treatment equipment according to claim 12, characterized in that, The desulfurization device (5) includes: A desulfurization unit (501) is connected to the settling chamber (201) and is used to desulfurize the product system obtained in the settling chamber (201). A cooling unit (502) is connected to the desulfurization unit (501) and is used to deliver a cooling medium into the settling chamber (201) during the desulfurization process in the desulfurization unit (501) to cool the product system in the settling chamber (201).

16. The arsenic trioxide purification and treatment equipment according to claim 12, characterized in that, The desulfurizing agent is any one of sodium hydroxide, sodium carbonate, or sodium bicarbonate.

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