WO2017113267A1 - Method for removing arsenic from arsenic-rich material by sublimation - Google Patents
Method for removing arsenic from arsenic-rich material by sublimation Download PDFInfo
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- WO2017113267A1 WO2017113267A1 PCT/CN2015/100060 CN2015100060W WO2017113267A1 WO 2017113267 A1 WO2017113267 A1 WO 2017113267A1 CN 2015100060 W CN2015100060 W CN 2015100060W WO 2017113267 A1 WO2017113267 A1 WO 2017113267A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions
- This invention relates to a process for the removal of arsenic from high arsenic materials to recover valuable metals therein.
- arsenic contained in high arsenic materials is often associated with other valuable metal elements such as lead in the smelting process.
- ⁇ , ⁇ , tin, etc. are volatilized into the flue gas dust.
- the total amount of lead, bismuth, antimony and tin in the flue gas is 5-50%, and the arsenic contains 3-60%, which is high value two. Secondary resources.
- the traditional fire recovery and separation process generally uses a rotary kiln method, that is, the low boiling point of arsenic trioxide in the feed is used to volatilize and separate from other metal oxides.
- a rotary kiln method that is, the low boiling point of arsenic trioxide in the feed is used to volatilize and separate from other metal oxides.
- the high arsenic dust, the arsenic content is generally between 60-70%, and the total amount of bismuth, lead, tin, etc. is often as high as 10-20%, because the temperature in the rotary kiln is above 500 °C, it has exceeded Arsenic trioxide has a boiling temperature of 465 ° C. When arsenic is partially boiled and volatilized, it carries other elements, especially lanthanum.
- the purpose of the invention is to utilize the high sublimation vapor pressure characteristic of arsenic trioxide in the wide temperature range before melting point, and provide a "non-stick melting" high arsenic material sublimation arsenic removal method with high metal separation rate. .
- the method for sublimation and arsenic removal of the high arsenic material according to the present invention comprises the following steps:
- step B controlling the temperature below 150 ° C, evaporating the high arsenic soot particles prepared in step A;
- the temperature is gradually increased to 500 ° C in the temperature section and the time period to complete the arsenic removal process.
- the high arsenic soot particles are added to the horse boiling furnace, the furnace temperature is adjusted to 150 ° C, and the drying is performed for 20 minutes.
- the step C is to raise the temperature of the horse boiling furnace to 280 ° C for 120 minutes, and no smoke is observed.
- the step D is: when the amount of residual arsenic in the high arsenic soot particles is reduced to 15-20%, the temperature of the boiling furnace is first adjusted to 320 ° C, after 25 minutes, no smoke is observed; then the temperature of the boiling furnace is adjusted to 380 ° C, 25 After a minute, the smoke is not seen; then the temperature of the horse is raised to 450 ° C. After 25 minutes, no smoke is observed. Finally, the temperature of the horse is increased to 500 ° C. After 30 minutes, no smoke is emitted, and the process of arsenic removal is completed.
- the hot air is heated to 280 ° C, and the air volume is 500 l / min scalar for 120 minutes.
- the step D is: when the amount of residual arsenic in the high arsenic soot particles is reduced to 15-20%, the hot air is first heated to 310 ° C, and the air volume is maintained for 20 minutes; then the hot air is heated to 380 ° C to keep the air volume unchanged. The time is 20 minutes; then the hot air is heated to 450 ° C, the air volume is unchanged, the time is 15 minutes; finally, the hot air is heated to 500 ° C, the air volume remains unchanged, the time is 10 minutes, no smoke is emitted, that is, the arsenic removal process is completed.
- the invention firstly granulates high arsenic soot, on the one hand, avoids secondary dust rising in the production process, on the other hand, can make the high arsenic soot raw material layer have good gas permeability, and is favorable for hot air heating and volatilized arsenic dust to flow out with hot air. .
- the present invention first controls the heating temperature at 200-280 ° C, lower than the melting point temperature of arsenic in the high arsenic pellets 275 ° C and the melting point temperature of arsenic trioxide 315 ° C, sublimation of volatile arsenic in the absence of liquid phase, so that the process There is no melting and sticking, and the whole can go smoothly.
- the temperature is gradually increased to 500 ° C in the temperature section and the time period, and the arsenic removal sublimation is transferred to the gasification and volatilization, which can effectively improve the desorption.
- Arsenic rate when the amount of residual arsenic in the high arsenic soot particles is reduced to 15-20%, the temperature is gradually increased to 500 ° C in the temperature section and the time period, and the arsenic removal sublimation is transferred to the gasification and volatilization, which can effectively improve the desorption. Arsenic rate.
- the arsenic removal process of high arsenic soot is carried out according to the method of the invention, not only the separation rate of arsenic and other valuable metal elements is high, the arsenic removal efficiency is high, and the melting and sticking phenomenon is not generated, so that the whole process proceeds smoothly, and thus the invention is A new, efficient and reliable process.
- Figure 1 is a flow chart of the method of the present invention.
- Embodiment 1 Implementation using a horse boiling furnace
- Embodiment 2 Implementation by hot air shaft furnace
- the specific gravity of the pellets is 1.8; 4) the hot air with a temperature of 150 ° C and a flow rate of 500 l / min, the duration is 80 minutes, and the water is dried; 5) the hot air is heated to 280 ° C, the air volume is 500 l / min scalar, time 120 minutes; 6) Sampling and measuring the amount of residual arsenic in the high arsenic soot particles to 15-20%, then warming the hot air to 310 ° C, maintaining the air volume for 20 minutes; 7) heating the hot air to 380 ° C to keep the air volume unchanged, time 20 8) The hot air is heated to 450 ° C, the air volume is unchanged, the time is 15 minutes; 9) The hot air is heated to 500 ° C, the air volume remains unchanged, the time is 10 minutes, no smoke is emitted, that is, the arsenic removal process is completed, after arsenic removal the residue pellet weight 2.948kg, remaining after removal of arsenic content of the pellets:
Abstract
Provided is a method for removing arsenic from an arsenic-rich material by sublimation, comprising the steps of: firstly, pelletizing an arsenic-rich smoke dust, and selecting pellets of arsenic-rich smoke dust having a particle size of 3-6 mm; next, evaporating moisture from the prepared pellets of arsenic-rich smoke dust at a controlled temperature of 150ºC; then, subjecting the pellets of arsenic-rich smoke dust to removal of arsenic by sublimation by heating the pellets to 200-280ºC; and lastly, completing the process of removal of arsenic by sublimation by increasing the temperature stepwise to different temperature ranges for different periods of time, up to 500ºC. Removing arsenic from arsenic-rich smoke dust with the method offers a high productivity in arsenic removal and does not result in the phenomenon of melting and stickiness, allowing for smooth operation of the whole process.
Description
本发明涉及一种从高砷物料中脱砷以回收其中有价金属的方法。This invention relates to a process for the removal of arsenic from high arsenic materials to recover valuable metals therein.
有色金属冶炼行业，高砷物料(高砷铜-镍合金、高砷铅泥、高砷镍矿、高砷金矿等)中含的砷在冶炼过程中常与其他有价金属元素，如铅、锑、铋、锡等一起挥发进入烟气尘，通常这种烟气尘含铅、锑、铋、锡的总量达5-50％，含砷3-60％不等，是高价值的二次资源。In the non-ferrous metal smelting industry, arsenic contained in high arsenic materials (high arsenic copper-nickel alloy, high arsenic lead mud, high arsenic nickel ore, high arsenic gold ore, etc.) is often associated with other valuable metal elements such as lead in the smelting process.锑, 铋, tin, etc. are volatilized into the flue gas dust. Usually, the total amount of lead, bismuth, antimony and tin in the flue gas is 5-50%, and the arsenic contains 3-60%, which is high value two. Secondary resources.
传统的火法回收分离工艺方法一般用转窑法，即利用料中三氧化二砷沸点低的特性，与其他金属氧化物挥发分离。此方法存在两大缺点：其一,高砷物料在较低温度时，例如300-400℃，会在转窑内壁上出现熔化、粘糊状态，产生“结圈”和“缩径”现象，导致操作困难，原因是三氧化二砷的熔点为315℃，当其在物料中的含量超过15-18％时，就会产生熔化粘糊现象；其二，其他有价金属的分离率低，在挥发出的高砷烟尘中，含砷量一般在60-70％之间，而锑、铅、锡等的总量常高达10-20％，原因是在转窑内温度达500℃以上时，已超过三氧化二砷的沸点温度465℃，当砷局部剧烈沸腾挥发时，携带其他元素，特别是锑大量挥发。The traditional fire recovery and separation process generally uses a rotary kiln method, that is, the low boiling point of arsenic trioxide in the feed is used to volatilize and separate from other metal oxides. There are two major disadvantages of this method: First, when the high arsenic material is at a lower temperature, for example, 300-400 ° C, it will be melted and viscous on the inner wall of the rotary kiln, resulting in "ringing" and "reducing the diameter" phenomenon. The operation is difficult because the melting point of arsenic trioxide is 315 ° C. When it exceeds 15-18% in the material, it will melt and paste; secondly, the separation rate of other valuable metals is low, and it will evaporate. The high arsenic dust, the arsenic content is generally between 60-70%, and the total amount of bismuth, lead, tin, etc. is often as high as 10-20%, because the temperature in the rotary kiln is above 500 °C, it has exceeded Arsenic trioxide has a boiling temperature of 465 ° C. When arsenic is partially boiled and volatilized, it carries other elements, especially lanthanum.
发明内容Summary of the invention
本发明目的是利用三氧化二砷在熔点前，在较宽的温度范围内有很高的升华蒸汽压的特性，提供一种“不粘熔”，且具有高金属分离率的高砷物料升华脱砷方法。The purpose of the invention is to utilize the high sublimation vapor pressure characteristic of arsenic trioxide in the wide temperature range before melting point, and provide a "non-stick melting" high arsenic material sublimation arsenic removal method with high metal separation rate. .
本发明所述的高砷物料的升华脱砷方法，包括步骤为：The method for sublimation and arsenic removal of the high arsenic material according to the present invention comprises the following steps:
A、将高砷烟尘造粒，并选取粒径3-6mm的高砷烟尘粒料；A. Granulate high-arsenic soot and select high-arsenic soot particles with a particle size of 3-6mm;
B、控温150℃以下，将步骤A制得的高砷烟尘粒料水分蒸发；B. controlling the temperature below 150 ° C, evaporating the high arsenic soot particles prepared in step A;
C、将高砷烟尘粒料加热至200-280℃，进行升华脱砷；C. heating the high arsenic soot pellets to 200-280 ° C for sublimation and arsenic removal;
D、当高砷烟尘粒料中残砷量降到15-20％后，分温度段和时间段逐步升高温度直至500℃，完成脱砷过程。D. When the amount of residual arsenic in the high arsenic soot particles is reduced to 15-20%, the temperature is gradually increased to 500 ° C in the temperature section and the time period to complete the arsenic removal process.
进一步地，所述步骤B为将高砷烟尘粒料加入马沸炉，调炉温至150℃，烘干20分钟。所述步骤C为调升马沸炉温度至280℃，持续时间120分钟，待不见冒烟。所述步骤D为：当高砷烟尘粒料中残砷量降到15-20％后，首先调马沸炉温度至320℃，25分钟后，待不见冒烟；然后调马沸炉温度至380℃，25分钟后，待不见冒烟；接着调马沸炉温度至450℃，25分钟后，待不见冒烟；最后调马沸炉温度至500℃，30分钟后，不见冒烟，即完成脱砷过程。
Further, in the step B, the high arsenic soot particles are added to the horse boiling furnace, the furnace temperature is adjusted to 150 ° C, and the drying is performed for 20 minutes. The step C is to raise the temperature of the horse boiling furnace to 280 ° C for 120 minutes, and no smoke is observed. The step D is: when the amount of residual arsenic in the high arsenic soot particles is reduced to 15-20%, the temperature of the boiling furnace is first adjusted to 320 ° C, after 25 minutes, no smoke is observed; then the temperature of the boiling furnace is adjusted to 380 ° C, 25 After a minute, the smoke is not seen; then the temperature of the horse is raised to 450 ° C. After 25 minutes, no smoke is observed. Finally, the temperature of the horse is increased to 500 ° C. After 30 minutes, no smoke is emitted, and the process of arsenic removal is completed.
进一步地，所述步骤B可为将高砷烟尘粒料装入热风竖炉的保温铁管内，料柱高度H＝283mm，粒料堆积比重1.8，并通以温度150℃，流量500l/min的热风,持续时间80分钟，烘干水分。所述步骤C为将热风升温至280℃，风量500l/min标量，时间120分钟。所述步骤D为：当高砷烟尘粒料中残砷量降到15-20％后，首先将热风升温至310℃，保持风量，时间20分钟；然后将热风升温至380℃保持风量不变，时间20分钟；接着将热风升温至450℃，风量不变，时间15分钟；最后将热风升温至500℃，风量保持不变，时间10分钟，不见冒烟，即完成脱砷过程。Further, the step B may be that the high-arsenic soot particles are charged into the heat-insulating iron pipe of the hot air shaft furnace, the height of the column is H=283 mm, the specific gravity of the pellets is 1.8, and the temperature is 150° C., and the flow rate is 500 l/min. Hot air, lasting 80 minutes, dry the water. In the step C, the hot air is heated to 280 ° C, and the air volume is 500 l / min scalar for 120 minutes. The step D is: when the amount of residual arsenic in the high arsenic soot particles is reduced to 15-20%, the hot air is first heated to 310 ° C, and the air volume is maintained for 20 minutes; then the hot air is heated to 380 ° C to keep the air volume unchanged. The time is 20 minutes; then the hot air is heated to 450 ° C, the air volume is unchanged, the time is 15 minutes; finally, the hot air is heated to 500 ° C, the air volume remains unchanged, the time is 10 minutes, no smoke is emitted, that is, the arsenic removal process is completed.
本发明首先将高砷烟尘造粒，一方面避免生产过程中二次扬灰尘，另一方面，可使高砷烟尘原料层有良好的透气性，利于热风加热和挥发出的砷尘随热风流出。另外，本发明先控制加热温度在200-280℃，低于高砷粒料中砷的熔点温度275℃和三氧化二砷的熔点温度315℃，在不产生液相的条件下，升华挥发砷，使过程不会产生熔化粘糊现象，整个能顺利进行。本发明方法中，当高砷烟尘粒料中残砷量降到15-20％后，分温度段和时间段逐步升温至500℃，由脱砷升华，转入气化挥发，能有效提高脱砷率。The invention firstly granulates high arsenic soot, on the one hand, avoids secondary dust rising in the production process, on the other hand, can make the high arsenic soot raw material layer have good gas permeability, and is favorable for hot air heating and volatilized arsenic dust to flow out with hot air. . In addition, the present invention first controls the heating temperature at 200-280 ° C, lower than the melting point temperature of arsenic in the high arsenic pellets 275 ° C and the melting point temperature of arsenic trioxide 315 ° C, sublimation of volatile arsenic in the absence of liquid phase, so that the process There is no melting and sticking, and the whole can go smoothly. In the method of the invention, when the amount of residual arsenic in the high arsenic soot particles is reduced to 15-20%, the temperature is gradually increased to 500 ° C in the temperature section and the time period, and the arsenic removal sublimation is transferred to the gasification and volatilization, which can effectively improve the desorption. Arsenic rate.
按本发明方法进行高砷烟尘的脱砷处理，不仅砷和其他有价金属元素分离率很高，脱砷生产率高，而且不会产生熔化粘糊现象，使整个过程顺利进行，因而本发明是一种全新、高效、可靠的工艺方法。The arsenic removal process of high arsenic soot is carried out according to the method of the invention, not only the separation rate of arsenic and other valuable metal elements is high, the arsenic removal efficiency is high, and the melting and sticking phenomenon is not generated, so that the whole process proceeds smoothly, and thus the invention is A new, efficient and reliable process.
图1为本发明方法流程图。Figure 1 is a flow chart of the method of the present invention.
实施例一：利用马沸炉实施Embodiment 1: Implementation using a horse boiling furnace
1)取高砷烟尘500g，该高砷烟尘成分为pb10％、sb25％、Bi 1％、Sn0.5％、As2o335％、H2O3％；2)在装有高砷烟尘的料盘内喷水70g并用人工摇动造粒；3)选取粒径3-6mm的高砷烟尘粒料100g加入马沸炉，调炉温至150℃，烘干20分钟，得高砷烟尘干料100-14.9＝85.1g；4)调升马沸炉温度至280℃，持续时间120分钟，待不见冒烟；5)取样测定高砷烟尘粒料中残砷量降到15-20％后，调马沸炉温度至320℃，25分钟后待不见冒烟；6)调马沸炉温度至380℃，25分钟后，待不见冒烟；7)调马沸炉温度至450℃，25分钟后待不见冒烟；8)调马沸炉温度至500℃，30分钟后不见冒烟，即完成脱砷过程，得到的脱砷残渣重量为64.52g、其中Pb13.03％、Sb31.74％、Bi 1.32％、Sn0.66％、As2o323％、脱砷率50％，脱砷烟尘重量为20.48g,含As2o375％、Pb0.48％、Sb3.87％、Bi0、Sn0。1) Take 500g of high-arsenic soot, which is pb10%, sb25%, Bi 1%, Sn0.5%, As 2 o 3 35%, H 2 O3%; 2) in high-arsenic soot Spray 70g of water in the tray and granulate by manual shaking; 3) Add 100g of high arsenic soot pellets with a particle size of 3-6mm to the horse boiling furnace, adjust the temperature of the furnace to 150 °C, and dry for 20 minutes to obtain high arsenic soot dry material 100- 14.9=85.1g; 4) Increase the temperature of the horse boiling furnace to 280 ° C for 120 minutes, and wait for no smoke; 5) Sampling and measuring the amount of residual arsenic in the high arsenic soot particles to 15-20%, then adjust the temperature of the horse to the furnace 320 ° C, after 25 minutes, no smoke will be seen; 6) adjust the temperature of the horse to 380 ° C, after 25 minutes, no smoke will be seen; 7) adjust the temperature of the horse to 450 ° C, 25 minutes after the smoke is not seen; 8) After the temperature reached 500 ° C, no smoke was observed after 30 minutes, that is, the arsenic removal process was completed, and the weight of the obtained arsenic removal residue was 64.52 g, of which Pb was 13.03%, Sb was 31.74%, Bi was 1.32%, Sn was 0.66%, and As 2 was obtained. o 3 23%, arsenic removal rate 50%, de-arsenic dust weight 20.48g, including As 2 o 3 75%, Pb 0.48%, Sb3.87%, Bi0, Sn0.
实施例二：利用热风竖炉实施Embodiment 2: Implementation by hot air shaft furnace
1)取高砷烟尘10kg，该高砷烟尘成分：Pb5％、Sb28％、Sn0.8％、As2o340％、H2O2％，2)
在装有高砷烟尘的料盘内喷水1.4kg并用人工摇动造粒；3)选取粒径3-6mm的高砷烟尘粒料4kg装入直径Φ100mm底部装有格筛的用于防漏的保温铁管内，料柱高度H＝283mm，粒料堆积比重1.8；4)通以温度150℃，流量500l/min的热风,持续时间为80分钟，烘干水分；5)将热风升温至280℃，风量500l/min标量，时间120分钟；6)取样测定高砷烟尘粒料中残砷量降到15-20％后，将热风升温至310℃，保持风量，时间20分钟；7)将热风升温至380℃保持风量不变，时间20分钟；8)将热风升温至450℃，风量不变，时间15分钟；9)将热风升温至500℃，风量保持不变，时间10分钟，不见冒烟，即完成脱砷过程，脱砷后残留粒料重量2.948kg，脱砷后残留粒料成分为：Pb6.71％、Sb36.56％、Sn1.08％、As2o328.2％，脱砷后收集烟尘量为1.052kg，脱砷后收集烟尘成分为Pb0.2％、Sb4％、As2o373％，脱砷率48％，金属分离率Pb大于99％，Sb大于95％，实现了高金属分离率。
1) Take 10kg of high arsenic soot, the high arsenic soot composition: Pb5%, Sb28%, Sn0.8%, As 2 o 3 40%, H 2 O2%, 2) Spray in the tray filled with high arsenic dust 1.4kg of water and granulation by artificial shaking; 3) 4kg of high-arsenic soot particles with a particle size of 3-6mm are selected and placed in a heat-insulating iron pipe with a grid of Φ100mm at the bottom and equipped with a sieve for leak prevention. The height of the column is H=283mm. The specific gravity of the pellets is 1.8; 4) the hot air with a temperature of 150 ° C and a flow rate of 500 l / min, the duration is 80 minutes, and the water is dried; 5) the hot air is heated to 280 ° C, the air volume is 500 l / min scalar, time 120 minutes; 6) Sampling and measuring the amount of residual arsenic in the high arsenic soot particles to 15-20%, then warming the hot air to 310 ° C, maintaining the air volume for 20 minutes; 7) heating the hot air to 380 ° C to keep the air volume unchanged, time 20 8) The hot air is heated to 450 ° C, the air volume is unchanged, the time is 15 minutes; 9) The hot air is heated to 500 ° C, the air volume remains unchanged, the time is 10 minutes, no smoke is emitted, that is, the arsenic removal process is completed, after arsenic removal the residue pellet weight 2.948kg, remaining after removal of arsenic content of the pellets: Pb6.71%, Sb36.56%, Sn1.08 %, as 2 o 3 28.2%, after the removal of arsenic collected Dust amount 1.052kg, dust collection Pb0.2% content of the arsenic removal, Sb4%, As 2 o 3 73%, 48% arsenic removal, Pb metal separation rate greater than 99%, Sb greater than 95%, to achieve a high Metal separation rate.
Claims (7)
- 一种高砷物料的升华脱砷方法，其特征在于包括步骤为：A method for sublimation and arsenic removal of a high arsenic material, characterized in that the steps include:A、将高砷烟尘造粒，并选取粒径3-6mm的高砷烟尘粒料；A. Granulate high-arsenic soot and select high-arsenic soot particles with a particle size of 3-6mm;B、控温150℃以下，将步骤A制得的高砷烟尘粒料水分蒸发；B. controlling the temperature below 150 ° C, evaporating the high arsenic soot particles prepared in step A;C、将高砷烟尘粒料加热至200-280℃，进行升华脱砷；C. heating the high arsenic soot pellets to 200-280 ° C for sublimation and arsenic removal;D、当高砷烟尘粒料中残砷量降到15-20％后，分温度段和时间段逐步升高温度直至500℃，完成脱砷过程。D. When the amount of residual arsenic in the high arsenic soot particles is reduced to 15-20%, the temperature is gradually increased to 500 ° C in the temperature section and the time period to complete the arsenic removal process.
- 根据权利要求1所述的一种高砷物料的升华脱砷方法，其特征在于，所述步骤B为将高砷烟尘粒料加入马沸炉，调炉温至150℃，烘干20分钟。The method for sublimation and arsenic removal of a high arsenic material according to claim 1, wherein the step B is to add the high arsenic soot particles to the horse boiling furnace, adjust the temperature of the furnace to 150 ° C, and dry for 20 minutes.
- 根据权利要求2所述的一种高砷物料的升华脱砷方法，其特征在于，所述步骤C为调升马沸炉温度至280℃，持续时间120分钟，待不见冒烟。The method for sublimation and arsenic removal of a high arsenic material according to claim 2, wherein the step C is to raise the temperature of the horse boiling furnace to 280 ° C for 120 minutes, and no smoke is observed.
- 根据权利要求3所述的一种高砷物料的升华脱砷方法，其特征在于，所述步骤D为：当高砷烟尘粒料中残砷量降到15-20％后，首先调马沸炉温度至320℃，25分钟后，待不见冒烟；然后调马沸炉温度至380℃，25分钟后，待不见冒烟；接着调马沸炉温度至450℃，25分钟后，待不见冒烟；最后调马沸炉温度至500℃，30分钟后，不见冒烟，即完成脱砷过程。The method for sublimation and arsenic removal of a high arsenic material according to claim 3, wherein the step D is: when the amount of residual arsenic in the high arsenic soot particles is reduced to 15-20%, the temperature of the boiling furnace is first adjusted. After 320 minutes, after 25 minutes, no smoke will be seen; then the temperature of the horse is increased to 380 ° C. After 25 minutes, no smoke will be emitted; then the temperature of the horse is increased to 450 ° C. After 25 minutes, no smoke will be emitted; After the temperature reached 500 ° C, after 30 minutes, no smoke was observed, that is, the arsenic removal process was completed.
- 根据权利要求1所述的一种高砷物料的升华脱砷方法，其特征在于，所述步骤B为将高砷烟尘粒料装入热风竖炉的保温铁管内，料柱高度H＝283mm，粒料堆积比重1.8，并通以温度150℃，流量500l/min的热风,持续时间80分钟，烘干水分。The method for sublimation and arsenic removal of a high arsenic material according to claim 1, wherein the step B is to install the high arsenic soot particles into the heat preservation iron pipe of the hot air shaft furnace, and the height of the material column is H=283 mm. The pellets have a specific gravity of 1.8 and are heated to a temperature of 150 ° C and a flow rate of 500 l / min for 80 minutes to dry the water.
- 根据权利要求5所述的一种高砷物料的升华脱砷方法，其特征在于，所述步骤C为将热风升温至280℃，风量500l/min标量，时间120分钟。The method for sublimation and arsenic removal of a high arsenic material according to claim 5, wherein the step C is to raise the hot air to 280 ° C, and the air volume is 500 l / min scalar for 120 minutes.
- 根据权利要求6所述的一种高砷物料的升华脱砷方法，其特征在于，所述步骤D为：当高砷烟尘粒料中残砷量降到15-20％后，首先将热风升温至310℃，保持风量，时间20分钟；然后将热风升温至380℃保持风量不变，时间20分钟；接着将热风升温至450℃，风量不变，时间15分钟；最后将热风升温至500℃，风量保持不变，时间10分钟，不见冒烟，即完成脱砷过程。 The method for sublimation and arsenic removal of a high arsenic material according to claim 6, wherein the step D is: when the amount of residual arsenic in the high arsenic soot particles is reduced to 15-20%, the hot air is first heated. Maintain air volume to 310 ° C for 20 minutes; then heat the hot air to 380 ° C to keep the air volume for 20 minutes; then heat the hot air to 450 ° C, the air volume is unchanged for 15 minutes; finally heat the hot air to 500 ° C The air volume remains unchanged for 10 minutes, and no smoke is emitted, that is, the process of removing arsenic is completed.
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| PCT/CN2015/100060 WO2017113267A1 (en) | 2015-12-31 | 2015-12-31 | Method for removing arsenic from arsenic-rich material by sublimation |
| ZA2018/04396A ZA201804396B (en) | 2015-12-31 | 2018-06-29 | Method for removing arsenic from high-arsenic material to recovery valuable metals therein |
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| CN101412538A (en) * | 2008-11-10 | 2009-04-22 | 江苏康洁环境工程有限公司 | Method for extracting arsenic trioxide from roasting dust of arsenic-containing gold concentrate powder |
| JP2014198655A (en) * | 2013-03-29 | 2014-10-23 | Jx日鉱日石金属株式会社 | Method for treating arsenic |
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| CN101412538A (en) * | 2008-11-10 | 2009-04-22 | 江苏康洁环境工程有限公司 | Method for extracting arsenic trioxide from roasting dust of arsenic-containing gold concentrate powder |
| JP2014198655A (en) * | 2013-03-29 | 2014-10-23 | Jx日鉱日石金属株式会社 | Method for treating arsenic |
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| CN115193210A (en) * | 2022-07-19 | 2022-10-18 | 中南大学 | Method for regulating and controlling condensation growth of gaseous arsenic oxide and application |
| CN115193210B (en) * | 2022-07-19 | 2023-09-26 | 中南大学 | Method for regulating and controlling condensation growth of gaseous arsenic oxide and application |
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