CN114378092B - Method for oxidation stabilization treatment of arsenic sulfide slag and application thereof - Google Patents
Method for oxidation stabilization treatment of arsenic sulfide slag and application thereof Download PDFInfo
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Abstract
The invention discloses a method for treating arsenic sulfide slag by oxidation stabilization and application thereof, the method comprises the steps of continuously and slowly adding excessive oxidant into the arsenic sulfide slag to be treated, continuously stirring under normal pressure, adding alkaline metal oxide at intervals after the oxidant is dripped, controlling the molar ratio of alkaline metal ions to arsenic ions to be more than 2, reacting for 1-2.5h, and standing for natural maintenance. The method provided by the invention can avoid introducing new impurities, and continuously dropwise adds heat generated by oxidizing arsenic sulfide slag with hydrogen peroxide to provide initial temperature for the subsequent process, so that the method is favorable for stabilizing reaction, and the used curing agent is low in cost, easy to obtain, convenient to operate in the process and mild in condition; the reaction process of the method provided by the invention does not need high-temperature and high-pressure treatment, has low energy consumption and safe operation, can form highly stable arsenic-containing solid precipitate after treatment, has the arsenic slag leaching toxicity of stably lower than 0.5mg/l after maintenance, and can be directly buried in the field.
Description
Technical Field
The invention relates to the technical field of heavy metal pollutant treatment, in particular to a method for treating arsenic sulfide slag by oxidation stabilization and application thereof.
Background
Arsenic is usually accompanied with nonferrous metal minerals, nonferrous smelting is mostly performed by adopting a pyrogenic process, and 40-50wt% of arsenic can enter smelting flue gas in the smelting process; when the smelting flue gas is used as raw material to produce sulfuric acid, the smelting flue gas is generally required to be washed and purified, and the process can produce waste acid with arsenic concentration of 2000-20000 mg/L. According to the relevant standards, the arsenic emission concentration in industrial wastewater should be lower than 0.5mg/L, and the sulfidation precipitation method is a typical representative of wastewater treatment technology, by adding H to arsenic-containing wastewater 2 S、Na 2 The method for generating insoluble sulfide precipitate by S, caS and other vulcanizing agents achieves the aim of removing heavy metals, has the advantages of high treatment rate, high precipitation efficiency, effective recovery of valuable metals and the like, and has the widest application in the treatment of arsenic-containing wastewater, especially high-concentration arsenic-containing heavy metal wastewater.
However, at the same time, the industrial application of the sulfidation precipitation method is accompanied by the mass production of arsenic sulfide slag, and thus, the safe disposal of the arsenic sulfide slag has been unprecedented.
The arsenic sulfide slag is a hazardous waste with strong corrosiveness, specifically, the arsenic content in the arsenic sulfide slag is about 10-60%, and the main component is amorphous As 2 S 3 Part of the arsenic-containing catalyst contains elemental sulfur, is insoluble in hydrochloric acid and sulfuric acid, is soluble in concentrated nitric acid and is easily soluble in alkali, arsenic is relatively high in activity, and most of the arsenic-containing catalyst exists in an oxidizable state and an acid extractable state and is easily migrated and converted under the influence of factors such as light, temperature, pH value, other coexisting matters and the like. Arsenic migrates to the surface or underground water to cause water pollution or is adsorbed by soil, thereby affecting the growth of crops and directly or indirectly endangering the health of human bodies. In addition, arsenic sulfide slag contains Pb, cd, cr and other toxic heavy metals, and the leaching toxicity of the arsenic sulfide slag is generally higher than the hazardous waste identification standard.
In conclusion, the arsenic sulfide slag has the characteristics of small particles, high water content, strong corrosiveness, large arsenic activity, complex components and the like; how to realize the stabilization, the reduction and the recycling treatment of the arsenic sulfide slag is an urgent problem facing the nonferrous smelting enterprises at present.
At present, the recycling treatment of arsenic sulfide slag mainly generates arsenic oxide, arsenate or simple substance arsenic, and adopts pyrogenic treatment such as redox roasting and wet arsenic extraction. Wherein: the pyrogenic process is to obtain arsenic-containing steam separated from other materials by oxidizing, reducing or vacuum roasting the arsenic sulfide slag, and the arsenic steam is subjected to secondary oxidation and dust collection to obtain As 2 O 3 However, the fire treatment has the defects of serious environmental pollution, large investment, small raw material application range and the like; wet arsenic extraction is carried out by acid leaching, alkali leaching or salt leaching to form arsenateSeparating from arsenic sulfide slag, further refining to obtain As 2 O 3 The wet arsenic extraction process has low energy consumption, less pollution and high efficiency, but the process is complex and the treatment cost is high. In summary, although the recycling method relieves the pollution and harm of the arsenic sulfide slag to the environment to a certain extent and realizes the recycling of the arsenic sulfide slag, the recycling method also has the problems of low recycling efficiency, relative limitation of arsenic product market and the like; meanwhile, due to continuous refinement of smelting technology, the contents of valuable metals in high-arsenic waste acid and high-arsenic electrolyte are gradually reduced, the recovery value of the valuable metals in the arsenic sulfide slag obtained after sulfuration and precipitation is not high, and the safe disposal of the arsenic sulfide slag is still an environmental problem facing the current situation.
Stabilization is mainly to change the permeability, compressibility and the like of wastes by adding medicaments and reduce the solubility, migration and toxicity of toxic substances such as heavy metals and the like, thereby reducing the pollution to the environment.
Research has shown that the stabilization and solidification technology can realize harmless treatment of arsenic sulfide slag. Zhou Shuli and the like, by mixing arsenic sulfide slag with sludge, lime, magnesium oxide and cement, it is found that under the optimal experimental condition that the mass ratio of the sludge, lime, magnesium oxide, cement and arsenic slag is 2.0:1.0:0.1:0.3:1.0, the leaching concentration of arsenic is greatly reduced from 1780.00mg/L to 1.37mg/L; however, the technology has the defects of large dosage of the medicament, large weight gain and capacity increase ratio of the final product and the like.
Du Ying and the like are used for solidifying arsenic sulfide slag by calcining industrial manganese slag, under the optimal process condition (the water-cement ratio is 1.67, and the curing is 28 days), the leaching concentration of arsenic in a solidified product is up to 4.4mg/L, and meanwhile, the arsenic is volatilized when calcined, so that secondary pollution is caused.
Qiong Lu et al solidified arsenic sulfide slag by calcining calcium oxide at medium temperature, calcined under optimal reaction conditions (As/Ca molar ratio of 1:8, 550 ℃) for 2 hours, with an As leaching concentration of 4.08mg/L (much higher than 1.2mg/L of the relevant standard).
Therefore, how to provide a stabilization treatment method for arsenic sulfide slag with simple process, stable effect and low cost is still a problem to be solved by the technicians in the field of hazardous waste harmless treatment.
In view of this, the present invention has been made.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a method for oxidizing and stabilizing arsenic sulfide slag and application thereof.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method for oxidation stabilization treatment of arsenic sulfide slag, comprising:
continuously and slowly adding excessive oxidant into arsenic sulfide slag to be treated, continuously stirring under normal pressure, adding alkaline metal oxide at intervals after the oxidant is dripped, wherein the adding amount of the alkaline metal oxide is that the molar ratio of alkaline metal ions to arsenic ions is controlled to be more than 2, reacting for 1-2.5h, and standing for natural maintenance.
In the above technical scheme, the oxidant is at least one of sodium hypochlorite, potassium permanganate, hydrogen peroxide, ferric chloride hexahydrate and ferric sulfate.
In a preferred embodiment of the present invention, the oxidizing agent is hydrogen peroxide.
In the above technical solution, the basic metal oxide is at least one of magnesium oxide, calcium oxide, iron oxide and manganese oxide.
In a preferred embodiment of the present invention, the basic metal oxide is calcium oxide.
In the technical scheme, the reaction temperature of the mixture of the arsenic sulfide slag and the oxidant is controlled to be 30-75 ℃.
In a preferred embodiment of the present invention, the reaction temperature of the mixture of arsenic sulfide slag and oxidizing agent is controlled to be 35-60 ℃.
Further, in the above technical scheme, the stirring revolution is 200-1200rpm, preferably 450-800rpm.
In one embodiment of the invention, the method for oxidation stabilization treatment of arsenic sulfide slag specifically comprises the following steps:
s1, continuously dropwise adding hydrogen peroxide into arsenic sulfide slag to be treated by adopting a peristaltic pump under normal pressure, wherein the adding amount of the hydrogen peroxide is that the liquid-solid ratio of the hydrogen peroxide to the arsenic sulfide slag is controlled to be 0.85-1.20:1, the temperature of a reaction system is controlled to be 40-85 ℃, and the reaction system is continuously and strongly stirred;
s2, adding calcium oxide with the mass which is 0.35-0.55 times of that of the arsenic sulfide slag into the reaction system in the step S1 for 4 times at intervals, and continuously stirring at 300-800rpm until the reaction is finished;
and S3, cooling the mixed slag obtained after the reaction in the step S2 to room temperature, standing for natural maintenance, and performing landfill treatment.
In detail, in the above technical solution, in step S1, the dropping speed of the hydrogen peroxide is 0.35-0.7ml/min for every 30g of arsenic sulfide slag.
In detail, in the above technical scheme, in step S2, calcium oxide is added at 3-4 uniform intervals within 20-50min after hydrogen peroxide is added dropwise to the arsenic sulfide slag to be treated.
Further, in the technical scheme, the reaction time is 30-60min.
In detail, in the above technical solution, in step S3, the time of standing and natural curing is 1-7d.
Still further, in the above technical scheme, the content of trivalent arsenic in the arsenic sulfide slag to be treated is 280-600mg/g in terms of arsenic.
The invention also provides application of the method for treating the arsenic sulfide slag by oxidation stabilization in treating arsenic sulfide-containing waste slag.
Compared with the prior art, the invention has the following advantages:
(1) The oxidant used in the method for oxidizing and stabilizing the arsenic sulfide slag is hydrogen peroxide, so that new impurities are prevented from being introduced in the treatment process, secondary pollution is avoided, the heat generated by continuously dropwise adding hydrogen peroxide to oxidize the arsenic sulfide slag provides an initial temperature for the next reaction, the stabilization reaction is facilitated, the used curing agent is calcium oxide, the method is low in cost and easy to obtain, the process operation is convenient, and the reaction condition is mild;
(2) The reaction process of the method for oxidizing and stabilizing the arsenic sulfide slag provided by the invention does not need high-temperature and high-pressure treatment, has low energy consumption and safe operation, can form highly stable arsenic-containing solid precipitate after treatment, has the leaching toxicity of the arsenic slag after maintenance of less than 0.5mg/L, has the leaching toxicity of arsenic far less than 5mg/L specified in GB5085.3-2007 hazardous waste identification standard leaching toxicity identification, stably reaches the latest landfill standard GB18598-2019 landfill pollutant control standard, and can be directly landfilled;
(3) The method for oxidation stabilization treatment of arsenic sulfide slag mainly comprises two stages, wherein in the oxidation stage, arsenic is oxidized into +5 by an oxidant from +3 valence, sulfur is oxidized into 0 valence or higher valence sulfur from-2 valence, in the stabilization stage, arsenic is subjected to arsenate precipitation, crystallization mineralization reaction, arsenate and metal ions are combined to form arsenic-containing mineral with small solubility, and XRD and SEM analysis show that the arsenic-containing mineral has low solubility calcium salt of arsenate Ca 4 (OH) 2 (AsO 4 ) 2 ·4H 2 O and Ca 5 (AsO 4 ) 3 (OH) and other crystals are formed, meanwhile, the mineral containing arsenic possibly coordinates and adsorbs with coordination groups in the medicament to form various stabilization acting forces, and particle size analysis shows that the particle size of the mineralized slag obtained after oxidation stabilization treatment is obviously increased, meanwhile, the formed calcium sulfate salt physically wraps arsenic and reduces the leaching concentration of the arsenic, the treatment effect is good, and the toxic leaching concentration of the arsenic reaches 0.27mg/L;
(4) The method for oxidizing and stabilizing the arsenic sulfide slag provided by the invention is wide in applicable arsenic content range, has the advantages of economy, environmental protection, short process flow and the like, has wide actual industrial application prospect, and has important practical significance in the field of dangerous waste treatment.
Drawings
FIG. 1 is a graph showing comparison of toxic leaching concentrations of solid products obtained by treating arsenic sulfide slag under different addition amounts of oxidizing agents in example 1 of the present invention;
FIG. 2 is an XRD spectrum of a solid product obtained by treating arsenic sulfide slag under different addition amounts of an oxidizing agent in example 1 of the present invention;
FIG. 3 is a fine XPS spectrum of S of a solid product obtained by treating arsenic sulfide slag under the conditions that the addition amount of an oxidizing agent is 6ml (a) and 30ml (b), respectively, in example 1 of the present invention;
FIG. 4 is a graph showing comparison of toxic leaching concentrations of solid products obtained by treating arsenic sulfide slag under different calcium oxide addition amounts in example 2 of the present invention;
FIG. 5 is a graph showing comparison of toxic leaching concentrations of solid products obtained by treating arsenic sulfide slag in example 3 of the present invention under different water bath temperatures;
FIG. 6 is an SEM image of the solid product obtained by treating arsenic sulfide slag under optimal process conditions in example 4 of the present invention;
FIG. 7 is a graph showing the particle size distribution of arsenic sulfide slag used in example 4 of the present invention;
FIG. 8 is a graph showing the particle size distribution of a solid product obtained by treating arsenic sulfide slag under optimal process conditions in example 4 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the examples, all means used are conventional in the art unless otherwise specified.
The terms "comprising," "including," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.
In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The raw materials used in the present invention are commercially available conventional products unless otherwise specified.
Example 1
This example 1 compares the effect of different amounts of oxidizing agent on As leaching toxicity in stabilized arsenic sulfide slag during oxidation stabilization of the arsenic sulfide slag, and is specifically As follows:
weighing 30.00g of arsenic sulfide slag in a 250mL beaker, placing the beaker in a water bath kettle with the temperature of 20 ℃ (the initial temperature of the reaction is controlled to be 20 ℃, and along with the exothermic reaction, the temperature of a reaction system is ensured to be 30-75 ℃), fully stirring and uniformly mixing by using a strong stirrer, the stirring speed of the stirrer is constant at 600r/min, the consumption of an oxidant (30% hydrogen peroxide) is respectively 0, 6, 12, 18, 24, 30, 36 and 42mL, continuously dropwise adding hydrogen peroxide at the rate of (0.6 mL/min) by using a peristaltic pump, adding 13.5g of CaO in three times at uniform intervals within 30min after the dropwise adding of the oxidant is finished, taking out the beaker after the reaction is finished, sealing by using a preservative film, naturally curing for two days, and freeze-drying the obtained cured slag by using a freeze dryer.
According to the standard of sulfuric acid nitric acid method (HJ/T299-2007) of solid waste leaching toxicity leaching method, a turnover type oscillator is adopted to carry out toxicity leaching test of As, and the concentration of As ions is analyzed by ICP-OES, and the specific result is shown in figure 1; as can be seen from FIG. 1, the arsenic ion concentrations in the leachate were 2311.5, 254, 10.17, 6.975, 0.47, 0.51, 0.33 and 0.36mg/L, respectively.
The XRD of the precipitated solid slag obtained after treating the arsenic sulfide slag is compared with a standard card, and the chart is shown in figure 2; as can be seen from FIG. 2, when the addition amount of the oxidant is 30, 36 and 42ml, the arsenic sulfide slag is treated to have Ca 4 (OH) 2 (AsO 4 ) 2 ·4H 2 O and Ca s (AsO 4 ) 3 (OH) and the like. When no oxidant exists, the arsenic sulfide slag can exist stably under the acidic condition, and when hydrogen peroxide is added, as 3+ Oxidized to H 3 AsO 4 And H 2 AsO 4 - Etc. while sulfur is oxidized to higher sulfur, as with the increase of the oxidizing agent 5+ The content is increased.
As shown in FIG. 3, the addition amount of the oxidant (30% hydrogen peroxide) is 6ml (a) and 30m1 (b) respectivelyXPS fine spectrum of S of the solid product obtained by treating arsenic sulfide slag. As can be seen from FIG. 3, XPS fine spectrum of a comparative oxidant amount of 6ml S when 30ml of oxidant was added 2- The content is obviously reduced, and more SO is generated by oxidation 3 2- SO and SO 4 2- Calcium sulfate is easy to form; research shows that under proper conditions, the solution containing arsenic acid anions reacts with calcium sulfate to form calcium arsenate minerals such as toxite, and the formation of the mineral absorbing the arsenic acid anions depends on Ca 2+ The ions are preferentially formed on the surface of calcium sulfate salt under the conditions of relative concentration, pH value, temperature and the like, and the toxite and other calcium arsenate minerals have higher solubility products, so that the formation of the toxite and other calcium arsenate minerals is beneficial to the stabilization of arsenic slag, and meanwhile, excessive calcium sulfate possibly coats the calcium arsenate salt, so that the leaching toxicity of arsenic after the stabilization treatment is further reduced.
Example 2
This example 2 compares the effect of different CaO amounts on As leaching toxicity in stabilized arsenic sulfide slag during oxidation stabilization of the arsenic sulfide slag, and is specifically As follows:
weighing 30.00g of arsenic sulfide slag in a 250mL beaker, placing the beaker in a water bath kettle with the temperature of 20 ℃ (the initial temperature of the reaction is controlled to be 20 ℃, the temperature of a reaction system is ensured to be 30-75 ℃ along with the exothermic reaction), fully stirring and uniformly mixing by using a powerful stirrer, the stirring speed of the stirrer is constant at 600r/min, the dosage of an oxidant (30% hydrogen peroxide) is fixed at 24mL, continuously dropwise adding hydrogen peroxide at the rate of 0.6mL/min by using a peristaltic pump, after the dropwise adding of the oxidant is finished, adding 6, 7.5, 9, 10.5, 12, 13.5 and 15g of CaO (the mass ratio of calcium oxide to arsenic sulfide slag is 0.2:1, 0.25:1, 0.3:1, 0.35:1, 0.4:1, 0.45:1 and 0.5:1) at equal intervals for three times within 30min, and taking out the beaker after the completion of the reaction, sealing by using a preservative film, naturally curing for two days, and adopting a freeze dryer to freeze-dry the obtained solidified slag.
According to the standard of sulfuric acid nitric acid method (HJ/T299-2007) of solid waste leaching toxicity leaching method, a toxicity leaching test of As is carried out by adopting a turnover type oscillator, and the concentration of As ions is analyzed by ICP-OES, and the specific result is shown in figure 4. As can be seen from FIG. 4, the arsenic ion concentrations in the leachate were 37.575, 3.895, 2.84, 2.43, 2.355, 0.575 and 0.40mg/L, respectively; with the increase of CaO amount, the pH value of the reaction system is continuously increased, which is favorable for leaching arsenic sulfide, and meanwhile, rich calcium ions and arsenate ions form more calcium arsenate minerals.
Example 3
This example 3 compares the effect of different bath temperatures on As leaching toxicity in stabilized arsenic sulfide slag during oxidation stabilization of the arsenic sulfide slag, and is specifically described As follows:
weighing 30.00g of arsenic sulfide slag in a 250mL beaker, placing the beaker in water baths with the temperature of 20, 40, 60 and 80 ℃ respectively, fully stirring and uniformly mixing by using a strong stirrer, wherein the stirring speed of the stirrer is constant at 600r/min, the consumption of an oxidant (30% hydrogen peroxide) is fixed at 30mL, continuously dropwise adding hydrogen peroxide at the rate of (0.6 mL/min) by using a peristaltic pump, adding 13.5g of CaO at equal intervals for three times within 30min after the dropwise adding of the oxidant is finished, taking out the beaker after the reaction is finished, sealing by using a preservative film, naturally curing for two days, and freeze-drying the obtained solidified slag by using a freeze dryer.
According to the standard of sulfuric acid nitric acid method (HJ/T299-2007) of solid waste leaching toxicity leaching method, a toxicity leaching test of As is carried out by adopting a turnover type oscillator, and the concentration of As ions is analyzed by ICP-OES, and the specific result is shown in figure 5. As can be seen from FIG. 5, the arsenic ion concentrations in the leachate were 0.5, 0.27, 0.42 and 0.48mg/L, respectively; the analysis results show that the oxidation process is a continuous exothermic reaction, the reaction in the previous stage provides an initial temperature for the surface reaction, and the water bath temperature has little influence on the leaching toxicity of the oxidation stabilization process As of the arsenic sulfide slag.
Example 4
In this example 4, arsenic sulfide slag was treated under the optimal process conditions (arsenic sulfide slag: hydrogen peroxide 1 g: 1mL, oxidant injection rate 0.6mL/min, caO usage 13.5g, addition time and addition mode 30min and three times of addition at even intervals, water bath temperature 40 ℃, stirring rate 600 r/min), and leaching toxicity experiments were performed on the obtained solidified slag according to the standard, specifically as follows:
weighing 30.00g of arsenic sulfide slag in a 250mL beaker, placing the beaker in a water bath kettle with the temperature of 40 ℃, fully stirring and uniformly mixing by using a strong stirrer, wherein the stirring speed of the stirrer is constant at 600r/min, the consumption of an oxidant (30% hydrogen peroxide) is fixed at 30mL, continuously dropwise adding hydrogen peroxide at the rate of 0.6mL/min through a peristaltic pump, adding 13.5g of CaO at three uniform intervals within 30min after the dropwise adding of the oxidant is finished, taking out the beaker after the reaction is finished, sealing by using a preservative film, naturally curing for two days, and freeze-drying the obtained solidified slag by using a freeze dryer.
According to the standard of sulfuric acid nitric acid method (HJ/T299-2007) of solid waste leaching toxicity leaching method, a turnover type oscillator is adopted to carry out As toxicity leaching test, the concentration of As ions is analyzed by ICP-OES, the concentration of the As ions in leaching liquid is respectively 0.27mg/L, the leaching concentration of arsenic is far lower than the limit value (5 mg/L) of the standard of GB5085.3-2007 (solid waste identification standard-leaching toxicity identification), and the requirement of the limit value (1.2 mg/L) of the standard of pollution control of hazardous waste landfill (GB 18598-2019) can be stably met.
As shown in FIG. 6, which is an SEM image of the solidified slag obtained under the optimal process conditions in example 4 of the present invention, showing the characteristic needle-like morphology, in combination with the corresponding XRD pattern under the conditions (shown in FIG. 2), it can be inferred that the mineral Ca reported by Bothes was generated in the solidified slag 5 (AsO 4 ) 3 (OH) the arsenate has low solubility, can be stable in a wide pH range, and can generate a large amount of calcium sulfate dihydrate crystals, and the particle size analysis of the stabilized product is carried out (the result is shown in figure 8), so that the particle size of the product is increased by nearly two times compared with that of raw slag (the result is shown in figure 7), and the calcium sulfate and the generated calcium arsenate are likely to be mutually wrapped, so that the method is one of the reasons for extremely good treatment effect of the invention.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention.
It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. A method for oxidation stabilization treatment of arsenic sulfide slag is characterized in that,
comprising the following steps:
continuously and slowly adding excessive oxidant into arsenic sulfide slag to be treated, continuously stirring under normal pressure, adding alkaline metal oxide at intervals after the oxidant is added dropwise, standing and naturally curing after the reaction;
the grain size of the mineralized slag obtained after oxidation stabilization treatment is obviously increased, and meanwhile, the formed calcium sulfate crystal salt physically wraps calcium arsenate salt to form solid solution, so that the leaching concentration of arsenic is reduced, and the obtained product reaches the latest landfill standard of GB18598-2019 landfill pollutant control standard;
the method specifically comprises the following steps:
s1, continuously dropwise adding hydrogen peroxide into arsenic sulfide slag to be treated by adopting a peristaltic pump under normal pressure, wherein the total adding amount is that the liquid-solid ratio of 30% hydrogen peroxide to the arsenic sulfide slag is controlled to be 0.8-1.4mL:1g, and continuously and strongly stirring;
s2, adding calcium oxide into the reaction system of the step S1 for 3 times at intervals, wherein the total mass of the calcium oxide is 0.45-0.5 times of that of the arsenic sulfide slag, and continuously stirring until the reaction is finished;
s3, standing the mixed slag obtained after the reaction in the step S2 for natural maintenance.
2. The method for oxidation stabilization treatment of arsenic sulfide slag according to claim 1, wherein,
controlling the reaction temperature of the mixture of the arsenic sulfide slag and the oxidant to be 30-75 ℃.
3. The method for oxidation stabilization treatment of arsenic sulfide slag according to claim 1, wherein,
in the step S3, the standing and natural curing time is 1-7d.
4. Use of the method according to any one of claims 1-3 in the treatment of arsenic sulphide-containing waste residues.
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| CN102151690A (en) * | 2011-01-20 | 2011-08-17 | 杭州大地环保有限公司 | Method for treating arsenic sulfide residue |
| CN105963902A (en) * | 2016-05-03 | 2016-09-28 | 云南大地丰源环保有限公司 | Method for innocent treatment of arsenic sulfide residues |
| CN113351630A (en) * | 2021-07-01 | 2021-09-07 | 中城华宇（北京）矿业技术有限公司 | Harmless treatment method for arsenic sulfide slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102151690A (en) * | 2011-01-20 | 2011-08-17 | 杭州大地环保有限公司 | Method for treating arsenic sulfide residue |
| CN105963902A (en) * | 2016-05-03 | 2016-09-28 | 云南大地丰源环保有限公司 | Method for innocent treatment of arsenic sulfide residues |
| CN113351630A (en) * | 2021-07-01 | 2021-09-07 | 中城华宇（北京）矿业技术有限公司 | Harmless treatment method for arsenic sulfide slag |
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