阅读说明：本技术 一种清洁环保的锡冶炼厂砷集中回收系统及回收方法 (Clean and environment-friendly concentrated arsenic recovery system and recovery method for tin smelting plant ) 是由 张璋 刘庆东 王彦坤 宋兴诚 陈颖飞 杨从兴 李鹏程 朱子民 于 2020-07-31 设计创作，主要内容包括：一种清洁环保的锡冶炼厂砷集中回收系统及回收方法,通过将沸腾炉布袋收尘器收集的含砷焙烧脱硫烟气布袋尘、顶吹炉布袋收尘器收集的含砷冶炼烟气布袋尘、烟化炉布袋收尘器收集的含砷烟化挥发烟气布袋尘及其电收尘器收集的含砷电收尘烟尘、精炼锅布袋收尘器收集的含砷精炼烟气布袋尘、电炉布袋收尘器收集的含砷冶炼烟气布袋尘通过气力输送管路送入密闭制粒机进行制粒,然后送入回转窑,与精炼锡产生的精炼析渣搭配焙烧,通过回转窑的电收尘器捕集锡氧化物,通过连接回转窑的布袋收尘器捕集砷氧化物,实现锡和砷的分离,得到富集砷的高砷烟尘。本发明实现了含砷烟尘的自动化收集、处理和回收,作业效率高,清洁环保。(A clean and environment-friendly arsenic centralized recovery system and a recovery method for a tin smelting plant are disclosed, wherein arsenic-containing roasting desulfurization flue gas bag dust collected by a boiling furnace bag dust collector, arsenic-containing smelting flue gas bag dust collected by a top-blown furnace bag dust collector, arsenic-containing fuming volatilization flue gas bag dust collected by a fuming furnace bag dust collector, arsenic-containing electric dust collection smoke dust collected by an electric dust collector, arsenic-containing refining flue gas bag dust collected by a refining boiler bag dust collector, and arsenic-containing smelting flue gas bag dust collected by an electric furnace bag dust collector are sent into a closed granulator through a pneumatic conveying pipeline for granulation, then sent into a rotary kiln, matched with refining slag generated by tin for roasting, tin oxide is collected by the refining electric dust collector, and arsenic oxide is collected by the bag dust collector connected with the rotary kiln, so that the separation of tin and arsenic is realized, and high-arsenic enriched smoke dust is obtained. The invention realizes the automatic collection, treatment and recovery of arsenic-containing smoke dust, and has high operation efficiency, cleanness and environmental protection.)

1. A clean and environment-friendly arsenic concentrated recovery system of a tin smelting plant is characterized in that tin smelting equipment of the tin smelting plant comprises a fluidized bed furnace (1), a top-blowing furnace (2), a fuming furnace (3), a crude tin refining pot (4), an electric furnace (5) and a rotary kiln (6), wherein the fluidized bed furnace is connected with a fluidized bed furnace cloth bag dust collector (1-1) for collecting roasting desulfurization smoke through a pipeline, the top-blowing furnace is connected with a top-blowing furnace cloth bag dust collector (2-1) for collecting smelting smoke through a pipeline, the fuming furnace is sequentially connected with an electric dust collector (3-1) and a fuming furnace cloth bag dust collector (3-2) for collecting fuming volatilization smoke through a pipeline, the crude tin refining pot is connected with a refining pot cloth bag dust collector (4-1) for collecting refining smoke through a pipeline, the electric furnace is connected with an electric furnace cloth bag dust collector (5-1) for collecting smelting smoke through a pipeline, a fluidized bed furnace gasification jet bin type pump (1-2), a top-blown furnace gasification jet bin type pump (2-2), a fuming furnace electric dust collection jet bin type pump (3-3), a fuming furnace cloth bag gasification jet bin type pump (4-3), a fuming furnace cloth bag gasification jet bin type pump (3-4), a refining furnace electric dust collection jet bin type pump (4-2), an electric furnace cloth bag gasification jet bin type pump (4-2) and an electric furnace are respectively connected with the lower part of a bottom hopper of the fluidized bed furnace cloth bag dust collector (1-1), the lower part of the bottom hopper of the top-blown furnace cloth bag dust collector (2-1), the lower part of the bottom hopper of the electric furnace cloth bag dust collector (5-1) through pipelines, the discharge ports of the fluidized bed furnace gasification injection bin type pump (1-2), the top-blown furnace gasification injection bin type pump (2-2), the fuming furnace electric dust collection gasification injection bin type pump (3-3), the fuming furnace cloth bag dust collection gasification injection bin type pump (3-4), the refining pot gasification injection bin type pump (4-2) and the electric furnace gasification injection bin type pump (5-2) are respectively connected with a pneumatic conveying pipe leading to a feed port (7-1) of a closed granulator (7), and a discharge port (7-2) of the closed granulator (7) is connected with a feed port of a rotary kiln (6) through a belt conveyor; a discharge control valve of a gasification injection bin pump (1-2) of the fluidized bed furnace, a gasification injection bin pump (2-2) of the top-blown furnace, an electric dust collection gasification injection bin pump (3-3) of the fuming furnace, a cloth bag dust collection gasification injection bin pump (3-4) of the fuming furnace, a gasification injection bin pump (4-2) of the refining boiler and a gasification injection bin pump (5-2) of the electric furnace is connected with a control system of the closed granulator (7).

2. A method for the centralized recovery of arsenic from flue gases of tin smelting plants using the system according to claim 1, characterized in that the method is as follows:

s1, controlling a gasification injection bin type pump (1-2) of the fluidized bed furnace, a gasification injection bin type pump (2-2) of the top-blown furnace, an electric dust collection gasification injection bin type pump (3-3) of the fuming furnace, a cloth bag dust collection gasification injection bin type pump (3-4) of the fuming furnace, a gasification injection bin type pump (4-2) of the refining pot and a discharge valve of a gasification injection bin type pump (5-2) of the electric furnace through a control system, and respectively controlling a cloth bag of the fluidized bed furnace, the gasification injection bin type pump (1-2) of the top-blown furnace, the electric dust collection gasification injection bin type pump (3-3) of the fuming furnace, the cloth bag of the arsenic-containing roasting desulphurization flue gas, the cloth bag of the arsenic-containing desulphurization flue gas, the cloth bag of the fluidized bed furnace, the gasification injection bin type pump (3-4) of the refining pot, the gasification injection bin type pump (4-2) of the electric furnace and the gasification injection, Arsenic-containing smelting flue gas cloth bag dust collected by a top-blowing furnace cloth bag dust collector (2-1), arsenic-containing electric dust collection smoke dust collected by a fuming furnace electric dust collector (3-1), arsenic-containing fuming volatilizing flue gas cloth bag dust collected by the fuming furnace cloth bag dust collector (3-2), arsenic-containing refining flue gas cloth bag dust collected by a refining boiler cloth bag dust collector (4-1) and arsenic-containing smelting flue gas cloth bag dust collected by an electric furnace cloth bag dust collector (5-1) are conveyed into a closed granulator (7) through a pneumatic conveying pipe for granulation;

s2, conveying arsenic-containing smoke dust particles prepared by a closed granulator (7) into a rotary kiln (6) through a belt conveyor, simultaneously conveying refined slag generated by refining tin in a crude tin refining pot (4) into the rotary kiln, matching and roasting the arsenic-containing smoke dust particles and the refined slag according to the mass ratio of 1-5: 1, collecting arsenic-containing tin oxide through an electric dust collector (6-1) of the rotary kiln, conveying the collected arsenic-containing tin oxide to the closed granulator (7) through a rotary kiln electric dust collection jet bin pump (6-3) for granulation, returning to the rotary kiln for roasting, collecting the arsenic oxide through a cloth bag dust collector (6-2) connected with the rotary kiln, realizing separation of tin and arsenic, and obtaining arsenic-enriched high-arsenic smoke dust;

s3, storing the high-arsenic smoke dust in a charging bucket (8), and finally transporting the high-arsenic smoke dust through a closed tank truck (9).

Technical Field

The invention belongs to the technical field of recovery of harmful substances in tin smelting, and particularly relates to an arsenic recovery system and a recovery method in a tin smelting process of a large-scale tin smelting plant.

Background

Arsenic in tin smelting mainly comes from tin concentrate, most of arsenic in the tin concentrate is removed through a beneficiation process, but arsenic is easily enriched in smelting smoke dust and also easily enters crude tin to be enriched in refining slag in the tin smelting process. Arsenic is widely distributed in a tin smelting process, and the harm of arsenic to tin smelting is reflected in that the tin smelting operation cost and the smelting difficulty are increased, and the defect that the unstructured emission of arsenic-containing materials can cause great adverse effects on the smelting surrounding environment and even endanger the health and life safety of people is also reflected in that the control is improper. In the processes of transporting and granulating arsenic-rich tin smoke dust, most tin smelting plants lack reasonable system planning and advanced process equipment configuration, so that the smoke dust is transported and granulated in an open or semi-open mode, manual participation is more, potential safety hazards are higher, particularly in large-scale tin smelting plants, arsenic-rich tin materials are more in variety, large in quantity and more dispersed in distribution, and the arsenic-rich tin materials are difficult to clean, efficiently and environmentally concentrate and recycle. Therefore, a process system which can collect the arsenic-tin-rich material cleanly and efficiently, can effectively separate arsenic from the arsenic-tin-rich material and can realize the respective recovery of arsenic and tin needs to be established, so that the tracking treatment of the arsenic-tin-rich material is more accurate, the deteriorative circulation of arsenic in the tin smelting process is avoided, and the arsenic is recycled.

Disclosure of Invention

The invention aims to solve the problems existing in the arsenic open circuit process of the current large-scale tin smelting plant, and provides a clean and environment-friendly concentrated arsenic recovery system and method for the tin smelting plant.

The technical scheme adopted by the invention is as follows:

the utility model provides a recovery system is concentrated to tin smelting plant arsenic of clean environmental protection, tin smelting plant's tin smelting equipment is including fluidized bed furnace, top-blown converter, fuming furnace, crude tin refining pot, electric stove, rotary kiln, the fluidized bed furnace has the fluidized bed furnace cloth bag dust collector of collecting calcination desulfurization flue gas through the tube coupling, and the top-blown converter cloth bag dust collector of collecting the smelting flue gas is connected with through the pipeline to the top-blown converter, and the fuming furnace has electric dust collector and fuming furnace cloth bag dust collector of collecting the fuming volatilization flue gas through pipeline order, and crude tin refining pot has the refining pot cloth bag dust collector of collecting the refining flue gas through the tube coupling, and the electric stove has the electric stove cloth bag dust collector of collecting the smelting flue gas through the tube coupling the bottom hopper below of fluidized bed furnace cloth bag dust collector, the bottom hopper below of top-blown converter cloth bag dust collector, the bottom hopper below of electric dust collector, the bottom hopper below of smoke bag dust collector, the smoke bag dust collector below of furnace cloth bag dust collector, The lower part of a bottom hopper of the refining boiler cloth bag dust collector and the lower part of a bottom hopper of the electric furnace cloth bag dust collector are respectively connected with a fluidized jet bin pump of the boiling furnace, a fluidized jet bin pump of the top-blowing furnace, an electric dust collection gasification jet bin pump of the fuming furnace, a bag dust collection gasification jet bin pump of the fuming furnace, a gasification jet bin pump of the refining boiler and a gasification jet bin pump of the electric furnace through pipelines, discharge ports of the fluidized jet bin pump of the boiling furnace, the fluidized jet bin pump of the top-blowing furnace, the electric dust collection gasification jet bin pump of the fuming furnace, the bag dust collection gasification jet bin pump of the fuming furnace, the gasification jet bin pump of the refining boiler, the gasification jet bin pump of the electric furnace and the gasification jet bin pump of the electric furnace are respectively connected with pneumatic conveying pipes leading to a feed port of a closed granulator, and a discharge port of; the discharge control valves of the fluidized jet bin pump of the fluidized bed furnace, the fluidized jet bin pump of the top-blown furnace, the electric dust collection gasification jet bin pump of the fuming furnace, the cloth bag dust collection gasification jet bin pump of the fuming furnace, the gasification jet bin pump of the refining boiler and the gasification jet bin pump of the electric furnace are connected with the control system of the closed granulator.

The method for intensively recovering arsenic in the flue gas of the tin smelting plant by adopting the system comprises the following steps:

s1, controlling discharge valves of a fluidized bed furnace gasification jet bin type pump, a top-blown furnace gasification jet bin type pump, a fuming furnace electric dust collection gasification jet bin type pump, a fuming furnace cloth bag dust collection gasification jet bin type pump, a refining boiler gasification jet bin type pump and an electric furnace gasification jet bin type pump through a control system, and respectively enabling arsenic-containing roasting desulfurization cloth bag flue gas dust collected by a fluidized bed furnace cloth bag dust collector, arsenic-containing smelting flue gas dust bag dust collected by the top-blown furnace cloth bag dust collector, arsenic-containing electric smoke dust collected by the fuming furnace electric collector, arsenic-containing volatilization flue gas cloth bag collected by the smoke bag dust collector, arsenic-containing refining gas cloth bag dust collected by the refining boiler cloth bag dust collector, arsenic-containing refining cloth bag dust collected by the refining boiler cloth bag dust collector, arsenic-containing gasification volatilization flue gas cloth bag collected by the refining boiler cloth bag dust collector, smoke dust collected by the refining boiler cloth bag dust collector, smoke bag dust collected by the refining boiler cloth bag dust collector, arsenic gasification jet bin type pump, and electric furnace gasification furnace, Arsenic-containing smelting flue gas bag dust collected by the electric furnace bag dust collector is conveyed into a closed granulator through a pneumatic conveying pipe for granulation;

s2, conveying the arsenic-containing smoke dust particles prepared by the closed granulator into a rotary kiln through a belt conveyor, simultaneously conveying refined slag generated by refining tin in a crude tin refining pot into the rotary kiln, and roasting the arsenic-containing smoke dust particles and the refined slag according to the mass ratio of 1-5: 1. Tin oxide is collected by an electric dust collector of the rotary kiln, the collected tin oxide containing arsenic is conveyed to a closed granulator by using a rotary kiln electric dust collection spraying bin type pump to be granulated and then returned to the rotary kiln for roasting, and the arsenic oxide is collected by a cloth bag dust collector connected with the rotary kiln, so that the separation of tin and arsenic is realized, and the arsenic-enriched high-arsenic smoke dust is obtained;

s3, storing the high-arsenic smoke in a charging bucket, and finally transporting the high-arsenic smoke through a closed tank truck.

According to the distribution characteristics of equipment for producing the arsenic-tin-rich materials in the smelting process of a large-scale tin smelting plant, the invention respectively adopts a clean and efficient arsenic-tin-rich material collecting means. Compared with the original arsenic treatment system of a large-scale tin smelting plant, the method provided by the invention realizes the collection, conveying and granulation of arsenic-containing tin smoke dust enriched with arsenic in each tin smelting process in a completely closed environment. The gasification injection bin pump, the closed granulator and the like are reasonably controlled by the control system, so that the arsenic-tin-containing smoke dust is collected and treated, and the device is clean, environment-friendly, automatic and efficient. Particularly, in the roasting and dearsenification process of the rotary kiln, the mode of matching treatment of arsenic-tin-containing smoke particles and refining iron and arsenic removal slag is adopted, the kiln period of the rotary kiln is prolonged, and high-arsenic dust collected by a rotary kiln cloth dust collector can be transported by a closed tank car to realize seamless butt joint. The whole arsenic open-circuit system fully embodies the obvious advantages of cleanness, high efficiency, safety and environmental protection.

Drawings

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

Detailed Description

FIG. 1 shows equipment for producing arsenic-tin rich material in a smelting process of a large-scale tin smelting plant, around which the concentrated arsenic recovery system of the present invention is installed. In the drawing, A represents a decontamination working section of a fluidized bed furnace, arsenic is enriched in cloth bag dust of a cloth bag dust collector of the fluidized bed furnace, B represents a smelting working section of a top-blown furnace, arsenic is enriched in the cloth bag dust of the cloth bag dust collector of the top-blown furnace, C represents a fuming working section of the fuming furnace, arsenic is enriched in electric dust collection of the electric dust collector and cloth bag dust of the cloth bag dust collector of the fuming furnace, D represents a crude tin refining working section, part of arsenic is enriched in the cloth bag dust of the cloth bag dust collector of the refining pot, most of arsenic is enriched in refining slag, and the refining slag is transported to a roasting working section of the rotary kiln through a slag box; e represents an electric furnace smelting refining section, arsenic is enriched in bag dust of an electric furnace bag dust collector, F represents a roasting section, G represents a closed granulation section, and arsenic-containing smoke dust from each smelting section is granulated so as to facilitate subsequent roasting dearsenification treatment.

As shown in figure 1, the arsenic centralized recovery system of the large-scale tin smelting plant is clean and environment-friendly, tin smelting equipment of the large-scale tin smelting plant generally comprises a fluidized bed furnace 1, a top-blown furnace 2, a fuming furnace 3, a crude tin refining pot 4, an electric furnace 5 and a rotary kiln 6, wherein the fluidized bed furnace is connected with a fluidized bed furnace bag dust collector 1-1 for collecting roasting desulfurization flue gas through a pipeline, the top-blown furnace is connected with a top-blown furnace bag dust collector 2-1 for collecting smelting flue gas through a pipeline, the fuming furnace is sequentially connected with an electric dust collector 3-1 for collecting fuming volatile flue gas and a fuming furnace bag dust collector 3-2 through pipelines, the crude tin refining pot is connected with a refining pot bag dust collector 4-1 for collecting refining flue gas through a pipeline, and the electric furnace is connected with an electric furnace bag dust collector 5-1 for collecting smelting flue gas through a pipeline. The lower part of a bottom hopper of the boiling furnace bag dust collector 1-1 is connected with a boiling furnace gasification jet bin type pump 1-2 through a pipeline, the lower part of a bottom hopper of the top-blowing furnace bag dust collector 2-1 is connected with a top-blowing furnace gasification jet bin type pump 2-2 through a pipeline, the lower part of a bottom hopper of the fuming furnace electric dust collector 3-1 is connected with a fuming furnace electric dust collection gasification jet bin type pump 3-3 through a pipeline, the lower part of a bottom hopper of the fuming furnace bag dust collector 3-2 is connected with a fuming furnace bag dust collection gasification jet bin type pump 3-4 through a pipeline, the lower part of a bottom hopper of the refining furnace bag dust collector 4-1 is connected with a refining furnace gasification jet bin type pump 4-2 through a pipeline, and the lower part of a bottom hopper of the electric furnace bag dust collector 5-1 is connected with a gasification jet bin type pump 5-2 through an electric furnace through a pipeline. The device comprises a gasification injection bin type pump 1-2, a top-blown furnace gasification injection bin type pump 2-2, a fuming furnace electric dust collection gasification injection bin type pump 3-3, a fuming furnace cloth bag dust gasification injection bin type pump 3-4, a refining boiler gasification injection bin type pump 4-2 and an electric furnace gasification injection bin type pump 5-2, wherein discharge openings of the gasification injection bin type pump 3-3, the fuming furnace cloth bag dust gasification injection bin type pump 3-4, the refining boiler gasification injection bin type pump 4-2 and the electric furnace gasification injection bin type pump 5-2 are respectively connected with a feeding pipe leading to a feeding hole 7-1 of a closed granulator 7, the feeding pipes leading to the closed granulator by the gasification injection bin type pumps can be independently arranged or can be led to the closed granulator after being collected, arrows in the figure 1 indicate. A discharge port 7-2 of the closed granulator 7 is connected with a feed port of the rotary kiln 6 through a belt conveyor; a discharge valve of a gasification injection bin type pump 1-2, a gasification injection bin type pump 2-2 of the top-blown furnace, an electric dust collection gasification injection bin type pump 3-3 of the fuming furnace, a cloth bag dust gasification injection bin type pump 3-4 of the fuming furnace, a gasification injection bin type pump 4-2 of the refining boiler and a gasification injection bin type pump 5-2 of the electric furnace is connected with a control system of a closed granulator 7. The gasification jet bin type pump 1-2, the top-blown furnace gasification jet bin type pump 2-2, the fuming furnace electric dust collection gasification jet bin type pump 3-3, the fuming furnace cloth bag dust gasification jet bin type pump 3-4, the refining pot gasification jet bin type pump 4-2 and the electric furnace gasification jet bin type pump 5-2 are all gasification jet pumps in the prior art and can be directly purchased in the market. The control system adopts a DCS control system in the prior art. The closed granulator and the rotary kiln are both equipment in the prior art.

The method for intensively recovering arsenic in flue gas of a tin smelting plant by adopting the system shown in figure 1 comprises the following steps:

s1, controlling a fluidized bed furnace gasification jet bin type pump 1-2, a top-blown furnace gasification jet bin type pump 2-2, a fuming furnace electric dust collection gasification jet bin type pump 3-3, a fuming furnace cloth bag dust collection gasification jet bin type pump 3-4, a refining boiler gasification jet bin type pump 4-2 and a discharge valve of an electric furnace gasification jet bin type pump 5-2 through a control system, and respectively enabling an arsenic-containing roasting desulfurization flue gas cloth bag collected by a fluidized bed furnace cloth bag collector 1-1, an arsenic-containing smelting flue gas cloth bag collected by the top-blown furnace cloth bag collector 2-1, a dust-containing smelting flue gas bag collected by the top-blown furnace cloth bag collector 4-2 and the electric furnace gasification jet bin type pump 5-2 to pass through a discharge valve of the fluidized bed furnace gasification jet bin type pump 1-2, the top-blown furnace electric dust collection gasification jet bin type pump 3-3, the refining boiler cloth bag gasification jet bin type pump 3-4-2, and the electric furnace gasification jet bin type pump 5-2, Arsenic-containing electric dust collection smoke collected by a fuming furnace electric dust collector 3-1, arsenic-containing fuming volatilizing smoke bag dust collected by a fuming furnace bag dust collector 3-2, arsenic-containing refined smoke bag dust collected by a refining pot bag dust collector 4-1 and arsenic-containing smelting smoke bag dust collected by an electric furnace bag dust collector 5-1 are conveyed into a closed granulator 7 through a pneumatic conveying pipe for granulation;

the conveying control of the arsenic-containing smoke dust is integrated on a DCS control interface of the granulation section, and the start and stop of the gasification spraying bin type pump of each section can be controlled through the DCS control interface, so that the arsenic-containing smoke dust of each section can be simultaneously conveyed or independently conveyed to the granulation section for granulation. The type of the smoke dust to be conveyed is set on the DCS control system, and the gasification injection bin type pump can feed back according to the information of the charge level indicator, so that automatic start-stop conveying operation is realized; after control parameters such as the feeding amount, the water adding amount, the rotating speed and the like of the closed granulator are set on a DCS control interface, the granulator can realize automatic granulation operation.

On the selection of the collocation and granulation of the arsenic-containing smoke dust from different sources, reasonable collocation and selection are carried out according to the arsenic content and the particle size distribution of the smoke dust material, so as to improve the granulation and balling rate, and simultaneously, the arsenic grade after the smoke dust granulation is controlled to be a more stable value, thereby facilitating the collocation and treatment of the raw materials roasted in the rotary kiln. For example, the bag-type dust of a boiling furnace with larger granularity and higher arsenic content and the bag-type dust of a fuming furnace with smaller granularity and lower arsenic content can be selected and matched for granulation, a gasification jet bin type pump for conveying the two kinds of smoke dust is started simultaneously through a DCS control interface, the conveying time is set to control the conveying amount of the two kinds of smoke dust, and the two kinds of smoke dust can be mixed in a closed granulator bin according to a certain proportion and then granulated.

S2, conveying the arsenic-containing smoke dust particles prepared by the closed granulator 7 into a rotary kiln 6 through a belt conveyor, simultaneously conveying refined slag (blocky arsenic-rich tin slag) generated by refining tin in a crude tin refining pot 4 into the rotary kiln, and roasting the arsenic-containing smoke dust particles and the refined slag according to the mass ratio of 1-5: 1 so as to balance the average arsenic grade of materials fed into the kiln and avoid agglomeration of the refined slag in the roasting process. Collecting arsenic-containing tin oxide by an electric dust collector 6-1 of a rotary kiln, wherein the collected arsenic-containing tin oxide has high arsenic content, conveying the collected arsenic-containing tin oxide to a closed granulator 7 by using an electric dust collection jet bin pump 6-3 of the rotary kiln for granulation, returning the obtained product to the rotary kiln for roasting, collecting arsenic oxide (mainly arsenic trioxide) by a bag dust collector 6-2 connected with the rotary kiln, realizing separation of tin and arsenic and obtaining arsenic-enriched high-arsenic smoke dust; and returning the roasting slag after arsenic removal to the smelting process.

S3, storing the high-arsenic smoke dust in a charging bucket 8, and finally transporting and selling the high-arsenic smoke dust through a closed tank truck 9.

Application example: a 60000t fine tin production tin smelting plant produces 17000t arsenic-tin-containing smoke dust in total every year, the average tin content is 45 percent, and the average arsenic content is 4.2 percent; 11000t of refined arsenic-removed slag is produced, and the slag contains 43 percent of tin on average and 12.5 percent of arsenic on average. The arsenic-containing tin smoke dust collected in each smelting section is conveyed to a closed granulator for granulation through a gasification injection bin type pump in a cleaning and high-efficiency mode, arsenic-removing and separating slag produced in a refining section is mixed and is subjected to centralized roasting treatment in a rotary kiln, finally, roasted sand containing 1.2% of arsenic on average and high-arsenic smoke dust containing 48% of arsenic are obtained, the high-arsenic smoke dust is transported and sold in a butt joint mode through a closed tanker, and the once removal rate of arsenic in a tin smelting process reaches 78%.

The invention realizes the separation and recovery of tin and arsenic in arsenic-containing smoke dust (namely arsenic-tin-rich smoke dust) generated by each tin smelting work section of a large tin smelting plant, can collect arsenic-tin-rich materials cleanly and efficiently, can also separate arsenic from the arsenic-tin-rich materials effectively, realizes the respective recovery of arsenic and tin, avoids the malignant circulation of arsenic in the tin smelting process, and ensures that the arsenic is recycled.