CN114618113B - Method for stabilizing arsenic-containing waste residue - Google Patents
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Abstract
The invention discloses a method for stabilizing arsenic-containing waste residue, which comprises the following steps: (1) uniformly mixing the pyrometallurgical lead slag and the arsenic-containing waste slag; (2) And (3) uniformly stirring the mixed waste residue obtained in the step (1) and the thiobacillus ferrooxidans bacterial liquid, standing and curing to complete the stabilization treatment of the arsenic-containing waste residue. The stabilizing treatment method of the arsenic-containing waste residue has obvious arsenic fixing effect, and the leaching toxicity of the arsenic residue after stabilizing treatment is lower than 5mg/L and meets the national standard; the arsenic slag after the stabilization treatment has long-term stability, and the leaching toxicity of arsenic can be stabilized below the concentration required by national standards.
Description
Technical Field
The invention belongs to the field of environmental treatment, and particularly relates to a co-treatment stabilizing method for lead-smelting waste residues and arsenic-containing waste residues.
Background
At the end of the last century and in the beginning of this century, a large number of arsenic-containing waste residues are left after the production process is forcibly shut down, and are directly stockpiled in a plant area in the open air, so that heavy metals in soil in the field and nearby soil seriously exceed the standard under the action of weathering eluviation, microorganisms and the like, and particularly, arsenic pollution is the most serious. After entering the soil, arsenic can be subjected to various reactions such as adsorption, complexation, dissolution, oxidation reduction and the like with organic matters, various mineral substances and substances in solution in the soil to form different chemical forms, which exist in the soil, influence the microbial community structure of the soil, and are accumulated in plants through the absorption action of plant root systems so as to enter the food chain circulation, thereby causing serious heavy metal threat to peripheral animals and living human beings.
At present, in the scientific research on the stabilizing treatment and disposal of arsenic slag at home and abroad, oxidation stability, cement curing and microorganism in-situ curing are the main current research hotspots. The purpose of oxidation stability is to improve the oxidation-reduction potential of the system and promote the conversion of highly toxic As (III) to As (V) so As to reduce the environmental toxicity, and common oxidants include hydrogen peroxide, potassium permanganate, liquid chlorine, liquid oxygen and other reagents, but for an open-air waste residue storage yard, the consumption of the oxidant is large, and the reagent purchase and transportation cost is high, so that the method is not an ideal scheme. The cement solidification is the utilization of CaO, siO generated by cement hydration 2 Wrapping the waste slag and hardeningThe leaching concentration of harmful components in the waste residue is reduced, but the cement solidification usually has the characteristics of uneven mixing, premature setting, poor stability and the like. The microorganism in-situ solidification refers to a process of converting free heavy metal ions into insoluble minerals and reducing heavy metal migration by utilizing a microorganism mineralization function, but the process is usually accompanied by the problems of long period, limited treatment capacity and limited growth of microorganisms under heavy metal stress.
Therefore, the development of a technique for stabilizing arsenic-containing waste residue, which is environmentally friendly, stable, harmless and low in cost, is urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects and shortcomings in the background art and provide a method for stabilizing treatment of arsenic-containing waste residue.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
(1) Uniformly mixing the lead slag smelted by the pyrogenic process and the arsenic-containing waste slag;
(2) And (3) uniformly stirring the mixed waste residue obtained in the step (1) and the thiobacillus ferrooxidans bacterial liquid, standing and curing to complete the stabilization treatment of the arsenic-containing waste residue.
Preferably, in the step (1), the main components of the pyrometallurgical lead smelting slag include calcite, gypsum, wustite and magnetite, a paste acid-base value detection method is adopted, the lead smelting slag is air-dried and ground to be less than 0.074mm, the lead smelting slag and water are stirred for half an hour at a mass ratio of 1.
In the method for stabilizing treatment of arsenic-containing waste residues, preferably, the mixing mass ratio of the pyrometallurgical lead smelting slag to the arsenic-containing waste residues is 1. Further preferably, the mixing mass ratio of the pyrometallurgical lead smelting slag to the arsenic-containing waste slag is 1.
Preferably, in the step (1), the pyrometallurgical lead smelting slag is air-dried, crushed and ball-milled and then is uniformly mixed with the arsenic-containing waste slag, and the proportion of-100 meshes of the pyrometallurgical lead smelting slag after ball milling is not less than 90%.
Preferably, in the method for stabilizing arsenic-containing waste residue, in the step (2), the liquid-solid ratio of the thiobacillus ferrooxidans bacterial liquid to the mixed waste residue is 4g/mL-6g/mL. Further preferably, the liquid-solid ratio is 5g/mL, so that the bacteria liquid is completely absorbed by the waste residues, and no redundant leachate is generated.
In the above method for stabilizing arsenic-containing waste residue, preferably, in the step (2), the stirring is performed in a stirrer, the rotation speed of the stirrer is 20rpm to 30rpm, and the stirring time is 5 to 10 minutes. Further, the rotation speed of the stirrer was 30rpm, and the stirring time was 5 minutes.
In the method for stabilizing arsenic-containing waste residue, preferably, in the step (2), the standing and aging time is 3 to 5 days. Further, the aging time was selected to be 5 days.
In the above method for stabilizing arsenic-containing waste residue, preferably, in step (2), before the Thiobacillus ferrooxidans bacterial liquid is mixed with the mixed waste residue, thiobacillus ferrooxidans is pre-cultured at 30 ℃ for 2-3 days.
In the above method for stabilizing arsenic-containing waste residue, preferably, the formula of the culture medium for culturing the thiobacillus ferrooxidans bacterial liquid is as follows: 3g/L (NH) 4 ) 2 SO 4 ，1g/LCaCl 2 ·H 2 O，0.5g/LK 2 HPO 4 ，0.5/LMgSO 4 ·7H 2 O，0.1g/LKCl，50g/LFeSO 4 ·7H 2 And O, dissolving with deionized water when in use, and adjusting the pH value to 3 by using sulfuric acid.
The technical principle of the invention is as follows:
in the lead smelting process, a certain amount of limestone (calcite) and quartz stone are added as a fusing agent, and in addition, the lead smelting raw material usually contains Al 2 O 3 And gangue components such as MgO and CaO, so that the pyrometallurgical lead slag contains partial residual calcium-magnesium alkaline oxides. The invention makes full use of the characteristic to neutralize the faintly acid arsenic-containing waste residue, improve the pH value of the system and reduce the dissolution and release of heavy metal ions. In addition, a large amount of iron oxide exists in the lead slag smelted by the pyrogenic process, so that the activity of mechanically activated minerals can be enhanced in the ore grinding process, the specific surface area is increased, and the lead slag smelted by the pyrogenic process is more beneficial to mixing with heavy oreThe metal is subjected to a series of adsorption, complexing, ion exchange and neutralization precipitation reactions, the lead slag slurry enters weakly acidic arsenic-containing waste slag, iron and calcium ions are released and combined with free (sub) arsenate ions in the slag to form ferric (sub) arsenate and calcium (sub) arsenate, and meanwhile, hydroxyl on the surface of a large amount of iron oxide in the lead slag can be subjected to coordination exchange with the arsenate, so that the mobility of arsenic is reduced. In addition, thiobacillus ferrooxidans is added into the ground ore slurry of the lead slag smelted by the pyrogenic process, the iron in the waste slag is oxidized by utilizing the oxidation effect of the thiobacillus ferrooxidans on the iron, the oxidation reduction potential is improved, the oxidation of arsenic is promoted, and meanwhile, the iron ions and sulfate ions in the solution are converted into hydroxyl ferric sulfate by utilizing the biomineralization function of the thiobacillus ferrooxidans, the hydroxyl ferric sulfate is a mineral material with a weak crystal form and a large specific surface area, and Fe in the mineral 3+ To AsO 4 3- And AsO 3 3- Has strong complexing ability and AsO 4 3- And AsO 3 3- With SO in mineral tubular tunnel structures 4 2- The ion radius is similar, the charged is similar, the exchange effect can be generated, and the arsenic can enter a mineral structure, so that the arsenic can be further stabilized.
Compared with the prior art, the invention has the advantages that:
(1) The stabilizing treatment method of the arsenic-containing waste residue has obvious arsenic fixing effect, the leaching concentration of the arsenic after stabilizing treatment meets the concentration limit value required by hazardous waste identification standard 5085.3-2007, the waste residue is converted from hazardous waste into common solid waste, and the management cost is greatly reduced.
(2) The method introduces thiobacillus ferrooxidans, and the existence of the thiobacillus ferrooxidans can improve the oxidation-reduction potential in the pyrometallurgical lead smelting slag and the arsenic-containing waste slag, inhibit the reductive dissolution of iron oxides, promote the mineralization of iron and arsenic, and improve the long-acting stability of the arsenic fixing technology; moreover, the thiobacillus ferrooxidans is an autotrophic aerobic microorganism, has a simple culture mode and strong heavy metal tolerance, can be propagated and replaced in a slag pile for a long time, and improves the long-acting stability of the arsenic fixing technology.
(3) The stabilization of the arsenic-containing waste residue of the present inventionThe treatment method has the technical advantage of treating wastes with wastes, fully utilizes the basic calcium-magnesium oxide remained in the pyrogenic lead smelting slag to perform neutralization reaction with weakly acidic waste residues, improves the pH value of slag heap leachate after rainfall, reduces the acidification hazard of the waste residues to peripheral soil, and can form scorodite (FeAsO) with free arsenate radicals by the specific adsorption and coprecipitation of iron oxide in the pyrogenic lead smelting slag 4 ·2H 2 O), arsenopyrite (Fe) 3 (AsO 4 ) 2 ·8H 2 O), iron pyrite (Fe) 4 (As O 4 ) 3 (OH) 3 ·6H 2 O), etc., and rapidly and efficiently reduce the migration of arsenic.
(4) The stabilizing treatment method of the arsenic-containing waste residue has the advantages of economy, simplicity, low cost and low maintenance cost.
Drawings
FIG. 1 is a phase composition diagram of No. 1 lead smelting slag in example 1 of the present invention.
FIG. 2 is a phase composition diagram of No. 1 arsenic-containing waste residue in example 1 of the present invention.
FIG. 3 is a graph showing the release concentration of statically eluviated As from untreated arsenic-containing waste residue No. 1 in example 1 of the present invention.
FIG. 4 is a graph showing the static leaching arsenic release concentration of the No. 1 arsenic-containing waste residue after the stabilization treatment in example 1 of the present invention.
FIG. 5 is a phase composition diagram of arsenic-containing waste residue No. 2 in example 2 of the present invention.
FIG. 6 is a graph showing the release concentration of statically eluviated As from untreated arsenic-containing waste residue No. 2 in example 2 of the present invention.
FIG. 7 is a graph showing the static leaching arsenic release concentration of the No. 2 arsenic-containing waste residue after the stabilization treatment in example 2 of the present invention.
FIG. 8 is a graph showing the static leaching arsenic release concentration of the arsenic-containing waste residue No. 2 after the stabilization treatment in comparative example 1 of the present invention.
FIG. 9 is a graph showing the static leaching arsenic release concentration of the arsenic-containing waste residue No. 2 after the stabilization treatment in comparative example 2 of the present invention.
Fig. 10 is a graph of the release concentration of static eluviated ferrous ions in various embodiments of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings, and the scope of the invention is not limited to the following specific embodiments.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The Thiobacillus ferrooxidans bacterial liquid adopted in the following examples is pre-cultured for 3 days at 30 ℃ before being mixed with waste residues, and the culture medium mainly comprises the following components: 3g/L (NH) 4 ) 2 SO 4 ，1g/LCaCl 2 ·H 2 O，0.5g/LK 2 HPO 4 ，0.5/LMgSO 4 ·7H 2 O，0.1g/LKCl，50g/LFeSO 4 ·7H 2 O, medium was prepared with deionized water and pH adjusted to 3 with sulfuric acid.
Example 1:
by utilizing the stabilizing treatment method of the arsenic-containing waste residue, a small-scale demonstration test is carried out in a laboratory, the No. 1 pyrogenic process lead smelting residue is taken from a certain lead smelting plant in Yunnan, the No. 1 arsenic-containing waste residue is taken from arsenic smelting residue piled up in a factory site of a certain waste earth arsenic smelting plant in Guangxi, the element composition is shown in a table 1 and a table 2, and the phase composition is shown in a table 1 and a table 2.
Table 1: no. 1 lead slag composition (wt.%)
Table 2: arsenic-containing waste residue component (wt.%) No. 1
The stabilizing treatment method of the arsenic-containing waste residue in the embodiment comprises the following steps:
(1) Air-drying, crushing and ball-milling 10g of the No. 1 pyrogenic process lead smelting slag to ensure that the granularity of the lead smelting slag reaches below 100 meshes (0.37 mu m), and then preliminarily mixing the lead smelting slag with 50g of No. 1 arsenic-containing waste slag according to a mass ratio of 1;
(2) Culturing thiobacillus ferrooxidans at 30 ℃ to logarithmic growth phase to obtain active bacterial liquid;
(3) And (3) stirring the waste residue mixed in the step (1) and the bacterial liquid in the step (2) in a stirrer at the rotating speed of 30rpm for 5 minutes according to the solid-liquid ratio of 5g/mL, uniformly mixing, and then standing and curing for 5 days to finish the stabilization treatment of the arsenic-containing waste residue.
And (3) detecting leaching toxicity: and (3) taking the waste residue subjected to the curing treatment in the step (3) and the untreated arsenic-containing waste residue No. 1, performing a solid waste toxicity leaching experiment, and detecting the concentration of heavy metal ions in the leaching solution by using an inductively coupled plasma emission spectrometer (ICP-OES), wherein the result is shown in Table 3.
Table 3: heavy metal leaching toxicity (mg/L) before and after No. 1 waste residue stabilization treatment
As shown in table 3, in the stabilized arsenic-containing waste residue No. 1, the leaching toxicity of heavy metals is significantly reduced, the leaching concentration of arsenic meets the concentration limit value required by hazardous waste identification standard 5085.3-2007, and the pH of the leachate is changed from weak acidity to neutrality, which indicates that the stabilization treatment can not only reduce the leaching toxicity of heavy metals in the waste residue, but also reduce the acidification hazard of the waste residue to the surrounding environment.
And (3) static leaching detection: taking the waste residue after the curing treatment in the step (3) and the untreated arsenic-containing waste residue No. 1, performing a static leaching experiment for 12 days, and detecting the concentration of heavy metal ions in the leachate by using an inductively coupled plasma emission spectrometer (ICP-OES), wherein the solid-liquid mass ratio of the waste residue to deionized water is 1:10, under the condition of static leaching in a room temperature environment, the concentration of arsenic in the untreated arsenic-containing waste residue leachate No. 1 is in a stable rising trend, the concentration can reach more than 70ppm after 12 days, and the initial concentration of arsenic in the stabilized arsenic-containing waste residue leachate No. 1 is lower than the concentration limit value (5 g/mL) required by hazardous waste identification standard 5085.3-2007, gradually decreases with the increase of time, and shows good long-term stability and safety.
Example 2:
by utilizing the method for stabilizing the arsenic-containing waste residue, a small-scale demonstration test is carried out in a laboratory, the No. 1 pyrogenic process lead slag is taken from a certain lead smelting plant in Yunnan, the components are the same as those in example 1, the No. 2 arsenic-containing waste residue is taken from the roasting furnace residue piled up in the factory site of a certain waste earth arsenic smelting plant in Guangxi, the surface is orange red, the composition of the elements of the waste residue is shown in a table 4, and the composition of the phases is shown in a table 5.
Table 4: arsenic-containing waste residue component (wt.%) No. 2
The procedure of the stabilizing treatment method of arsenic-containing waste residue of this example is the same as that of example 1.
And (3) detecting leaching toxicity: and (3) taking the waste residue after the curing treatment in the step (3) and the untreated arsenic-containing waste residue No. 2, performing a solid waste toxicity leaching experiment, and detecting the concentration of heavy metal ions in the leaching solution by using an inductively coupled plasma emission spectrometer (ICP-OES), wherein the result is shown in Table 5.
Table 5: heavy metal leaching toxicity (mg/L) before and after stabilizing treatment of No. 2 arsenic-containing waste residue
As shown in table 5, the leaching toxicity of heavy metals in the stabilizing treated arsenic-containing waste residue No. 2 is significantly reduced, the leaching concentration of arsenic meets the concentration limit value required by the hazardous waste identification standard 5085.3-2007, and the pH of the leachate is changed from weak acidity to neutrality, which indicates that the stabilizing treatment can not only reduce the leaching toxicity of heavy metals in the waste residue, but also reduce the acidification harm of the waste residue to the surrounding environment.
And (4) performing a static leaching experiment, namely performing a static leaching experiment for 12 days on the waste residue after the aging treatment in the step (3) and the untreated arsenic-containing waste residue No. 2, and detecting the concentration of heavy metal ions in the leachate by using an inductively coupled plasma emission spectrometer (ICP-OES), wherein the result is shown in figures 6 and 7, and the solid-liquid mass ratio of the waste residue to deionized water is 1: 10. under the condition of room-temperature environment static leaching, the concentration of arsenic in the untreated arsenic-containing waste residue leachate is in a stable rising trend, the concentration can reach more than 120ppm after 12 days, and the leaching rate does not have a reduction trend, which shows that the heavy metal in the untreated waste residue has the characteristic of continuous high-concentration release, while the initial concentration of the heavy metal arsenic in the waste residue after stabilization treatment is only single digit and continuously decreases, and is finally stabilized below 2mg/L, thereby meeting the concentration limit value required by hazardous waste identification standard 5085.3-2007.
Comparative example 1:
the comparative example aims to illustrate the synergistic promotion effect of the addition of the pyrogenic lead slag and the thiobacillus ferrooxidans on the stabilization of arsenic-containing waste residues, so that the comparative example only takes the pyrogenic lead slag as a stabilizing material, other used materials are the same as those in example 2, and the specific steps are as follows:
(1) Air-drying, crushing and ball-milling 10g of the No. 1 pyrogenic process lead smelting slag to ensure that the granularity of the lead smelting slag reaches below 100 meshes (0.37 mm), and then preliminarily mixing the lead smelting slag with 50g of No. 2 arsenic-containing waste slag according to a mass ratio of 1;
(2) And (3) stirring the water and the waste residue mixed in the step (1) in a stirrer at the rotating speed of 30rpm for 5 minutes according to the solid-to-liquid ratio of 5g/mL, uniformly mixing, and then standing and curing for 5 days to finish the stabilization treatment of the arsenic-containing waste residue.
And (3) leaching toxicity detection: and (3) taking the waste residue after the curing treatment in the step (2) and the untreated arsenic-containing waste residue No. 2, performing a solid waste toxicity leaching experiment, and detecting the concentration of heavy metal ions in the leaching solution by using an inductively coupled plasma emission spectrometer (ICP-OES), wherein the result is shown in Table 6.
Table 6: heavy metal leaching toxicity (mg/L) before and after stabilizing treatment of No. 2 arsenic-containing waste residue
As shown in table 6, when the arsenic-containing waste residue after the stabilization treatment of the lead-smelting slag is added, the pH of the leachate is significantly increased because acidic substances are neutralized with calcite in the lead slag, the leaching concentration of heavy metals in the treated waste residue is also significantly reduced, but the leaching concentration of arsenic cannot meet the concentration limit required by "hazardous waste identification standard 5085.3-2007".
Static leaching experiment: and (3) taking the waste residue after the curing treatment in the step (3), carrying out a static leaching experiment for 12 days, and detecting the concentration of heavy metal ions in the leaching solution by using an inductively coupled plasma emission spectrometer (ICP-OES), wherein the result is shown in figure 8.
Comparative example 2:
the embodiment aims to illustrate the synergistic promotion effect of the addition of the pyrometallurgical lead smelting slag and the thiobacillus ferrooxidans on the stabilization of arsenic-containing waste slag, so that the embodiment only takes the thiobacillus ferrooxidans as a stabilizing material, other used materials are the same as those in embodiment 2, and the specific steps are as follows:
(1) Preparing bacterial liquid: centrifuging 100mL of Thiobacillus ferrooxidans in logarithmic phase at 8000rpm for 10 min, pouring out supernatant, washing with ultrapure water, repeating the centrifuging step for 2 times, and finally preparing 100mL of bacterial suspension from bacterial precipitate with ultrapure water;
(2) Stirring: and (3) taking 500g of No. 2 arsenic-containing waste residue to be treated, pouring the waste residue and 100mL of bacterial suspension into a stirrer, and stirring at the rotating speed of 30rpm for 5 minutes to mix uniformly.
(3) Curing treatment: and (3) standing the waste residue stirred in the step (2) together with a container for 5 days at room temperature to finish the stabilization treatment of the arsenic-containing waste residue.
And (3) leaching toxicity detection: and (4) taking the waste residue after the curing treatment in the step (3) and the untreated arsenic-containing waste residue No. 2, performing a solid waste toxicity leaching experiment, and detecting the concentration of heavy metal ions in the leachate by using an inductively coupled plasma emission spectrometer (ICP-OES), wherein the result is shown in Table 7.
Table 7: heavy metal leaching toxicity (mg/L) before and after stabilizing treatment of No. 2 arsenic-containing waste residue
As shown in table 7, although the arsenic leaching concentration of the arsenic-containing waste residue subjected to the iron protoxide thiobacillus stabilization treatment is significantly reduced, the arsenic-containing waste residue is far below the concentration limit value required by "hazardous waste identification standard 5085.3-2007", because the iron content of the waste residue is low, biosynthesis of iron oxide and a scholar mineral is not facilitated, and in addition, the leaching concentration of other heavy metals has no significant reduction tendency, and the pH of the leaching solution is lower than that of an untreated group, because the iron protoxide thiobacillus promotes oxidation acid production of a sulfide mineral, which leads to slag heap acidification and dissolution of a part of sulfide binding heavy metals.
Static leaching experiment: and (3) taking the waste residue after the curing treatment in the step (3), carrying out a static leaching experiment for 12 days, and detecting the concentration of heavy metal ions in the leaching solution by using an inductively coupled plasma emission spectrometer (ICP-OES), wherein the result is shown in figure 9.
From the test results, the leaching concentrations of arsenic and other heavy metals in the waste residues after the stabilizing treatment in the examples 1 and 2 are obviously reduced, particularly the leaching concentrations of arsenic are below 1.5mg/L, the heavy metal leaching standard of industrial waste is met, and compared with the arsenic-containing waste residue without stabilizing treatment, the leaching concentrations are respectively reduced by 99.45% and 99.43%. As can be seen from comparison of the treatment results of comparative examples 1 and 2 and example 2, when the pyrometallurgical lead smelting slag is used as a stabilizer alone, calcite in the slag has a certain neutralizing capacity on acidic substances in arsenic-containing waste residues, active mineral components such as iron, silicon, calcium and magnesium can reduce the leaching concentration of heavy metals through reactions such as adsorption, complexation, ion exchange and precipitation, but the leaching concentration of arsenic cannot reach the concentration limit value required by hazardous waste identification standard 5085.3-2007. The stability of arsenic has an important relationship with the content and form of iron oxide, and when Thiobacillus ferrooxidans is used alone as a stabilizer, the formation of iron oxide can be promoted by biological oxidation, and part of arsenic is stabilized by coordination exchange. When the lead smelting slag is independently used as a stabilizer, the reducibility inside the slag is enhanced along with the occurrence of a neutralization effect, iron oxide is reducibly dissolved under the promotion effect of anaerobic microorganisms, and the concentration of ferrous ions is gradually increased, as shown in fig. 10. As time goes by, iron oxide is dissolved and arsenic is easily released again, so that the arsenic-containing waste residue needs to be stabilized through the synergistic effect of the lead smelting slag and the thiobacillus ferrooxidans.
The above embodiments are only preferred embodiments of the present invention, and the technical solutions of the present invention can be illustrated in detail, but not limited to the present invention, and any supplement, modification or similar substitution made within the scope of the principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for stabilizing treatment of arsenic-containing waste residue is characterized by comprising the following steps:
(1) Uniformly mixing the pyrometallurgical lead slag and the arsenic-containing waste slag; the main components of the lead slag produced by the pyrogenic process comprise calcite, gypsum, wustite and magnetite, wherein the iron content is 30-40%, and the calcium content is 10-15%; the mass ratio of the lead slag smelted by the pyrogenic process to the arsenic-containing waste slag is 1-1;
(2) And (2) uniformly stirring the mixed waste residue obtained in the step (1) and the thiobacillus ferrooxidans bacterial liquid, standing and curing to complete the stabilization treatment of arsenic-containing waste residue, wherein the solid-liquid ratio of the mixed waste residue to the thiobacillus ferrooxidans bacterial liquid is 4-6 g/mL.
2. The method for stabilizing treatment of the arsenic-containing waste residue according to claim 1, wherein in the step (1), the pyrometallurgical lead slag is air-dried, crushed and ball-milled, and then is uniformly mixed with the arsenic-containing waste residue, and the proportion of the-100 mesh size fraction of the pyrometallurgical lead slag after ball milling is not less than 90%.
3. The method according to claim 1, wherein in the step (2), the stirring is performed in a stirrer, the stirrer rotates at 20 to 30rpm, and the stirring time is 5 to 10 minutes.
4. The method of claim 1, wherein the standing aging time in step (2) is 3 to 5 days.
5. The method according to any one of claims 1 to 4, wherein the Thiobacillus ferrooxidans bacterial liquid is cultured in advance at 30 ℃ for 2 to 3 days before being mixed with the mixed slag in the step (2).
6. The method for stabilizing treatment of arsenic-containing waste residue as claimed in claim 5, wherein the formula of the culture medium for culturing the Thiobacillus ferrooxidans bacterial solution is as follows: 3g/L (NH) 4 ) 2 SO 4 ，1g/LCaCl 2 ·H 2 O，0.5g/LK 2 HPO 4 ，0.5/LMgSO 4 ·7H 2 O，0.1g/LKCl，50g/LFeSO 4 ·7H 2 O, pH value is 3.
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