CN106011475A - Method for innocent treatment of low-concentration arsenic-containing waste residue and recovery of arsenic - Google Patents
Method for innocent treatment of low-concentration arsenic-containing waste residue and recovery of arsenic Download PDFInfo
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- CN106011475A CN106011475A CN201610431490.XA CN201610431490A CN106011475A CN 106011475 A CN106011475 A CN 106011475A CN 201610431490 A CN201610431490 A CN 201610431490A CN 106011475 A CN106011475 A CN 106011475A
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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
- C22B7/006—Wet processes
- C22B7/008—Wet processes by an alkaline or ammoniacal leaching
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G28/00—Compounds of arsenic
- C01G28/005—Oxides; Hydroxides; Oxyacids
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
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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
- C22B30/00—Obtaining antimony, arsenic or bismuth
- C22B30/04—Obtaining arsenic
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a method for innocent treatment of low-concentration arsenic-containing waste residue and recovery of arsenic. Aiming at low-concentration arsenic-containing waste residue, according to the invention, a multistage alkaline leaching method is adopted, wherein mechanical stirring is performed for 10-12h in the environment of 60-80 DEG C, three-stage successive leaching is adopted, the arsenic leaching rate reaches more than 80%, the arsenic content of waste residue after treatment is less than 0.05%, which is lower than the hazardous waste identification limiting value, and therefore, the waste residue can be used as making material of building materials. As2O3 in an arsenic-containing alkaline leaching solution can be recovered by acid neutralization and sedimentation, and ferric sulfate is added to a leaching solution after filtering and sedimentation so as to produce FeAsO4.2H2O sedimentation, the comprehensive arsenic removing rate of the arsenic-containing alkaline leaching solution can reach 99%, and filter liquor can be recycled. Compared with the prior art, according to the invention, no wastewater discharge is caused in the whole process, the technology is simple, and the material is easily available, and the method can be widely popularized and applied to treatment and resource utilization of low-concentration arsenic-containing solid waste.
Description
Technical field
The invention belongs to hazardous waste process and application technology as the second resource field, especially relate to a kind of low concentration and contain
The method that arsenic waste residue harmless treatment and arsenic reclaim.
Background technology
Arsenic often and the non-ferrous metal association such as tungsten, stannum, copper, lead, zinc, antimony, hydrargyrum, gold, along with these metals
A large amount of exploitations and smelt, substantial amounts of arsenic enters in the arsenic-containing waste residue that smeltery produced million tons per year, but these contain
Arsenic waste residue generally processes in the way of hoarding storage.Therefore domestic multiple area there occurs serious arseniasis event,
Create serious environmental problem.Therefore, how to process these arsenic-containing waste residues and become unavoidable problem.
At present, development a series of solidification, stabilization technology tackles this problem.Main by adding
A certain amount of cement, Calx, iron salt, aluminium salt etc. stablize the arsenic in refuse.But these stabilizer additions are big,
Price is higher, causes processing and cost of disposal height, and the product increase-volume after processing is than big, is unfavorable for final disposal.
Processing mode more preferable to arsenic-containing waste residue is also resource recycling while harmless treatment.Its technology is mainly divided
For pyrogenic process and wet method, pyrogenic process is i.e. by methods such as oxidizing roasting, reduction roasting and vacuum bakings, at arsenic-containing waste residue
As is obtained while reason2O3；Wet method i.e. uses salt leaching, alkali leaching or the method for acidleach, is first transferred in solution by arsenic,
Extract arsenic compound therein the most again.But both approaches is applicable to arsenic content higher (10～30%) more
High concentration arsenic-containing waste residue, resource inconspicuous for the arsenic content low concentration arsenic-containing waste residue treatment effect less than 3%
Utilize cost performance the highest.It addition, the influence of extraction to arsenic such as other compositions such as Al, Fe etc. in low concentration arsenic-containing waste residue
Very big, increase the intractability of such arsenic-containing waste residue.
Summary of the invention
The present invention is directed to present stage low concentration arsenic-containing waste residue be difficult to process disposal the problem of recycling and provide
A kind of method that low concentration arsenic-containing waste residue harmless treatment and arsenic reclaim.The inventive method makes full use of arsenic-containing waste certainly
The feature of body also combines the advantage of multistage alkali leaching, and points three grades gradually leach, and the first order mainly releases in arsenic-containing waste residue it
The competitive inhibition that arsenic is leached by he composition such as Al, Fe etc., second and third grade relieves the base of suppression in the first order
On plinth, leaching arsenic efficiently, make the arsenic-containing waste residue arsenic content after process be less than 500mg/kg, can be as Building wood
Material manufactures raw material resourcesization and utilizes, and turns waste into wealth, and can obtain As simultaneously2O3Product.Have significant economy,
Society and environmental benefit.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of method that low concentration arsenic-containing waste residue harmless treatment and arsenic reclaim, comprises the following steps:
(1) leaching of one-level alkali processes: mixed with arsenic-containing waste residue by alkali liquor, mechanical agitation 10～12h, and solid-liquid separation
Obtaining one-level alkali leaching slag and one-level alkali immersion, one-level alkali immersion supplements alkali liquor, continues on for new arsenic-containing waste residue and leaches, directly
To alkali immersion arsenic concentration more than 0.3～0.4g/L, enter step (5) (namely arsenic precipitation recycling step) afterwards；
(2) two grades of alkali leachings process: one-level alkali leaching slag mixes with alkali liquor, mechanical agitation 10～12h, and solid-liquid separation
Obtaining two grades of alkali leaching slags and two grades of alkali immersion, two grades of alkali immersion supplement alkali liquor, are recycled and reused for the leaching of one-level alkali leaching slag,
Step (4) (namely arsenic precipitation recycling step) is entered after being more than 1.5～2g/L to alkali immersion arsenic concentration；
(3) three grades of alkali leachings process: two grades of alkali leaching slags mix with alkali liquor, mechanical agitation 10～12h, and solid-liquid separation
Obtaining three grades of alkali leaching slags and three grades of alkali immersion, three grades of alkali immersion supplement alkali liquor, are recycled and reused for the leaching of two grades of alkali leaching slags,
Step (4) (namely arsenic precipitation recycling step), three grades of alkali are entered after being more than 1.5～2g/L to alkali immersion arsenic concentration
Leaching slag has completed dearsenization, can manufacture raw material recycling as construction material；
(4) after two grades of alkali immersion and three grades of alkali immersion mixing, obtain mixed base immersion, add acid for adjusting pH to 1～2,
Mechanical agitation, reacts 1～2h, precipitates and collect precipitate, scrubbed dried product As2O3；
(5) precipitate and collect the mixed base immersion after precipitate, after mixing with one-level alkali immersion, adding Fe2(SO4)3
Solution, mechanical agitation, react 1～2h, precipitate and collect precipitate, after sediment undergoes washing, obtain scorodite；Receive
Liquid after collection precipitate is back to one-level alkali leaching process as alkali liquor, two grades of alkali leachings process and process step with three grades of alkali leachings
Suddenly.
The reaction related generally in step (1), (2), (3) is: As2O3+ 6NaOH=2Na3AsO3+3H2O
The dominant response formula that step (4) relates to is:
2Na3AsO3+3H2SO4=3Na3AsO3+3H2O+As2O3；
The dominant response formula that step (5) relates to is:
2Na3AsO3+Fe2(SO4)3+4H2O=2FeAsO3·2H2O+3Na SO4。
One-level alkali leaching processes in step, the volume mass ratio 3～4L/kg of alkali liquor and arsenic-containing waste residue；
Two grades of alkali leachings process in step, and alkali liquor soaks the volume mass ratio 3～4L/kg of slag with one-level alkali；
Three grades of alkali leachings process in step, alkali liquor and the volume mass ratio 3～4L/kg of two grades of alkali leaching slags.
Described arsenic-containing waste residue is exploitation, roasting, smelting is containing arsenic ore and produces containing containing of producing in arsenic product process
Arsenic solid waste, wherein arsenic mainly exists with oxide and sulphided form；The total content of arsenic is that one thousandth is to hundred
/ tri-.
Described alkali liquor is sodium hydroxide solution, and pH is 12.5～13.5.
Three grades of described alkali leaching slag arsenic contents are less than 500mg/kg.
One-level alkali leaching processes in step, and the temperature that alkali liquor mixes with arsenic-containing waste residue is 60-80 DEG C；
Two grades of alkali leachings process in step, and the temperature that alkali liquor mixes with one-level alkali leaching slag is 60-80 DEG C；
Three grades of alkali leachings process in step, and the temperature of alkali liquor and two grades of alkali leaching slag mixing is 60-80 DEG C.
One-level alkali leaching process, two grades of alkali leaching process and three grades of alkali leachings process in steps, and solid-liquid separation all uses nature to sink
The mode of fall is carried out.
In step (5), add Fe by Fe:As mol ratio 2～3:12(SO4)3Solution.
Further, one-level alkali leaching processes in step, is mixed with arsenic-containing waste residue by alkali liquor and first obtains after solid-liquid separation
One-level alkali leaching slag and 1 alkali immersion of one-level, after 1 alkali immersion of one-level supplements alkali liquor, continue on for new arsenic-containing waste residue
Leaching, obtain 2 alkali immersion of one-level, 2 alkali immersion of one-level are recycled and reused for new arsenic-containing waste residue and leach after supplementing alkali liquor,
Until alkali immersion arsenic concentration is more than 0.3～0.4g/L, enter step (5) afterwards.
Further, two grades of alkali leachings process in steps, alkali liquor is mixed with one-level alkali leaching slag also after solid-liquid separation first
Obtain two grades of alkali leaching slags and two grades of 1 alkali immersion, after two grades of 1 alkali immersion supplement alkali liquor, continue on for the leaching of one-level alkali
The leaching of slag, obtains two grades of 2 alkali immersion, and two grades of 2 alkali immersion are recycled and reused for one-level alkali leaching slag after supplementing alkali liquor
Leaching, until alkali immersion arsenic concentration more than 1.5～2g/L, enters step (4) afterwards.
Further, three grades of alkali leachings process in steps, by after alkali liquor and two grades of alkali leaching slag mixing also solid-liquid separation first
Obtain three grades of alkali leaching slags and three grades of 1 alkali immersion, after three grades of 1 alkali immersion supplement alkali liquor, continue on for two grades of alkali leachings
The leaching of slag, obtains three grades of 2 alkali immersion, and three grades of 2 alkali immersion are recycled and reused for two grades of alkali leaching slags after supplementing alkali liquor
Leaching, until alkali immersion arsenic concentration more than 1.5～2g/L, enters step (4) afterwards.
Compared with prior art, the present invention has the following advantages and beneficial effect:
1., for other treatment technologies reluctant low concentration arsenic-containing waste residue, the invention provides a kind of multistage alkalescence
The method leached, the first order releases the competitive inhibition that in arsenic-containing waste residue, arsenic is leached by other compositions such as Al, Fe etc.,
Second and third level leaches on the basis of the first order leaches, leaching arsenic efficiently；The method can the most innoxious place
Manage such arsenic-containing waste residue, alleviate arsenic-containing waste residue and hoard storage, pollute the present situation of environment.
2. low concentration arsenic-containing waste residue is after this method harmless treatment, and arsenic content is less than 500mg/kg, can conduct
Construction material manufactures raw material resourcesization recycling, turns waste into wealth, and can obtain As simultaneously2O3With scorodite product.
There is significant economy, society and environmental benefit.
Accompanying drawing explanation
Fig. 1 is present invention process flow chart.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
Process object be certain gold mine produce carry gold mine tailing, in celadon fine grained be dehydrated purees, moisture content is
13.90～16.14%, x-ray fluorescence spectrometry (XRF) detection show this mine tailing mainly containing Si, Al, Fe, Ca,
The elements such as K, the content of arsenic is 0.263%, and x-ray diffractometer detection shows that the arsenic in this mine tailing is mainly with As2O3
Presented in, on a small quantity with As2S3, the form such as FeAsS exists.
Innoxious and the arsenic recovery process of this mine tailing is as it is shown in figure 1, in Fig. 1*Place's dotted line represents that sulphuric acid is according to demand
Whether adding, remaining dotted line, detailed process is as follows if representing circulation:
(1) concentration is that the sodium hydroxide solution of 1.2mol/L is mixed in 3L/kg ratio with mine tailings, heated solution
To 60 DEG C, mechanical agitation 12h, natural subsidence solid-liquid separation obtains one-level alkali leaching slag and 1 alkali immersion of one-level, one-level
1 alkali immersion continues on for new arsenic-containing waste residue and leaches after supplementing NaOH solution, obtain 2 alkali immersion of one-level, and one
Level alkali immersion is so recycled and reused for arsenic-containing waste residue and leaches, until 9 times；One-level alkali leaching slag is same and 1.2mol/L
Sodium hydroxide solution by volume mass ratio 3L/kg mixes, under the conditions of 60 DEG C, and mechanical agitation 12h, solid-liquid separation
Obtaining two grades of alkali leaching slags and two grades of 1 alkali immersion, two grades of alkali immersion are also recycled and reused for two grades after supplementing NaOH solution
The leaching of alkali leaching slag, until 9 times；Two grades of alkali leaching slag is same again and 1.2mol/L sodium hydroxide solution by volume matter
Amount ratio 3L/kg mixing, under the conditions of 60 DEG C, mechanical agitation 12h, solid-liquid separation obtains three grades of alkali leaching slags and three grade 1
Secondary alkali immersion, three grades of alkali immersion are also recycled and reused for the leaching of three grades of alkali leaching slags after supplementing NaOH solution, until 9
Secondary.
(2) two grades of 9 alkali immersion and three grades of 9 alkali immersion mixing are 3251.69mg/L containing arsenic concentration, acid adding
Regulation pH to 2, mechanic whirl-nett reaction 2h, precipitate and collect precipitate, scrubbed dried product As2O3；
Two grades of 9 alkali immersion and three grades of 9 alkali immersion after precipitating and collecting precipitate add 9 alkali immersion of one-level
After (being 701.30mg/L containing arsenic concentration), add Fe by Fe:As mol ratio 3:12(SO4)3Solution, machinery stirs
Mix reaction 2h, precipitate and collect precipitate, scrubbed dried scorodite.Collect the liquid (arsenic after precipitate
Concentration is 1.4mg/L) it is back to the dipped journey of alkali.
Arsenic-containing waste residue averagely goes arsenic rate to be 99.3%, and the alkali leaching slag obtained is averagely containing arsenic 0.04%, and washing is dried to be used
In firing Dinas brickes.
Embodiment 2
Process object is same as in Example 1.
Innoxious and arsenic recovery process is as it is shown in figure 1, in Fig. 1*Place's dotted line represents the most whether sulphuric acid adds,
Remaining dotted line represents circulation, and detailed process is as follows:
(1) concentration is that the sodium hydroxide solution of 1.2mol/L is mixed in 3L/kg ratio with mine tailings, heated solution
To 60 DEG C, mechanical agitation 12h, natural subsidence solid-liquid separation obtains one-level alkali leaching slag and 1 alkali immersion of one-level, one-level
1 alkali immersion continues on for arsenic-containing waste residue and leaches after supplementing NaOH solution, obtain 2 alkali immersion of one-level, one-level
Alkali immersion is so recycled and reused for arsenic-containing waste residue and leaches, until 16 times；One-level alkali leaching slag is same and the hydrogen of 1.2mol/L
Sodium hydroxide solution by volume mass ratio 3L/kg mixes, and under the conditions of 60 DEG C, mechanical agitation 12h, solid-liquid separation obtains
Two grades of alkali leaching slags and two grades of 1 alkali immersion, two grades of alkali immersion are also recycled and reused for two grades of alkali after supplementing NaOH solution
The leaching of leaching slag, until 16 times；Two grades of alkali leaching slag is same again and 1.2mol/L sodium hydroxide solution by volume quality
Ratio 3L/kg mixing, under the conditions of 60 DEG C, mechanical agitation 12h, solid-liquid separation obtain three grades of alkali leaching slags and three grades 1 time
Alkali immersion, three grades of alkali immersion are also recycled and reused for the leaching of three grades of alkali leaching slags after supplementing NaOH solution, until 16 times.
(2) two grades of 16 alkali immersion and three grades of 16 alkali immersion mixing are 3577.59mg/L containing arsenic concentration, add
Acid for adjusting pH to 1.5, mechanic whirl-nett reaction 2h, precipitate and collect precipitate, scrubbed dried product
As2O3；Two grades of 16 alkali immersion and three grades of 16 alkali immersion after precipitating and collecting precipitate add one-level 16
After secondary alkali immersion (being 1039.53mg/L containing arsenic concentration), add Fe by Fe:As mol ratio 3:12(SO4)3Solution,
Mechanic whirl-nett reaction 2h, precipitates and collects precipitate, scrubbed dried scorodite.After collecting precipitate
Liquid (arsenic concentration is 1.7mg/L) is back to the dipped journey of alkali.
Arsenic-containing waste residue averagely goes arsenic rate to be 98.7%, and the alkali leaching slag obtained is averagely containing arsenic 0.05%, and washing is dried to be used
In firing Dinas brickes.
The above-mentioned description to embodiment is to be understood that for ease of those skilled in the art and use to send out
Bright.These embodiments obviously easily can be made various amendment by person skilled in the art, and at this
The General Principle illustrated is applied in other embodiments without through performing creative labour.Therefore, the present invention does not limits
In above-described embodiment, those skilled in the art are according to the announcement of the present invention, without departing from changing that scope is made
Entering and revise all should be within protection scope of the present invention.
Claims (10)
1. the method that a low concentration arsenic-containing waste residue harmless treatment and arsenic reclaim, it is characterised in that include following
Step:
(1) leaching of one-level alkali processes: mixed with arsenic-containing waste residue by alkali liquor, mechanical agitation, and solid-liquid separation obtains one-level
Alkali leaching slag and one-level alkali immersion, one-level alkali immersion supplements alkali liquor, continues on for new arsenic-containing waste residue and leaches, until alkali leaching
Liquid arsenic concentration is more than 0.3～0.4g/L, enters step (5) afterwards；
(2) two grades of alkali leachings process: one-level alkali leaching slag mixes with alkali liquor, mechanical agitation, and solid-liquid separation obtains two grades
Alkali leaching slag and two grades of alkali immersion, two grades of alkali immersion supplement alkali liquor, are recycled and reused for the leaching of one-level alkali leaching slag, soak to alkali
Liquid arsenic concentration enters step (4) after being more than 1.5～2g/L；
(3) three grades of alkali leachings process: two grades of alkali leaching slags mix with alkali liquor, mechanical agitation, and solid-liquid separation obtains three grades
Alkali leaching slag and three grades of alkali immersion, three grades of alkali immersion supplement alkali liquor, are recycled and reused for the leaching of two grades of alkali leaching slags, soak to alkali
Liquid arsenic concentration enters step (4) after being more than 1.5～2g/L, three grades of alkali leaching slags have completed dearsenization, can be as Building wood
Material manufactures raw material recycling；
(4) after two grades of alkali immersion and three grades of alkali immersion mixing, obtain mixed base immersion, add acid for adjusting pH to 1～2,
Mechanical agitation, precipitates and collects precipitate, scrubbed dried product As2O3；
(5) precipitate and collect the mixed base immersion after precipitate, after mixing with one-level alkali immersion, adding Fe2(SO4)3
Solution, mechanical agitation, precipitates and collects precipitate, obtain scorodite after sediment undergoes washing；After collecting precipitate
Liquid is back to one-level alkali leaching process as alkali liquor, two grades of alkali leachings process and process steps with three grades of alkali leachings.
The method that a kind of low concentration arsenic-containing waste residue harmless treatment the most according to claim 1 and arsenic reclaim,
It is characterized in that, one-level alkali leaching processes in step, the volume mass ratio 3～4L/kg of alkali liquor and arsenic-containing waste residue；
Two grades of alkali leachings process in step, and alkali liquor soaks the volume mass ratio 3～4L/kg of slag with one-level alkali；
Three grades of alkali leachings process in step, alkali liquor and the volume mass ratio 3～4L/kg of two grades of alkali leaching slags.
The method that a kind of low concentration arsenic-containing waste residue harmless treatment the most according to claim 1 and arsenic reclaim,
It is characterized in that, described arsenic-containing waste residue is exploitation, roasting, smelting is containing arsenic ore and produces containing in arsenic product process
The arsenic-containing solid wastes produced, wherein arsenic mainly exists with oxide and sulphided form；The total content of arsenic is thousand points
One of to 3 percent.
The method that a kind of low concentration arsenic-containing waste residue harmless treatment the most according to claim 1 and arsenic reclaim,
It is characterized in that, described alkali liquor is sodium hydroxide solution, and pH is 12.5～13.5.
The method that a kind of low concentration arsenic-containing waste residue harmless treatment the most according to claim 1 and arsenic reclaim,
It is characterized in that, three grades of described alkali leaching slag arsenic contents are less than 500mg/kg.
The method that a kind of low concentration arsenic-containing waste residue harmless treatment the most according to claim 1 and arsenic reclaim,
It is characterized in that, one-level alkali leaching processes in step, and the temperature that alkali liquor mixes with arsenic-containing waste residue is 60-80 DEG C；
Two grades of alkali leachings process in step, and the temperature that alkali liquor mixes with one-level alkali leaching slag is 60-80 DEG C；
Three grades of alkali leachings process in step, and the temperature of alkali liquor and two grades of alkali leaching slag mixing is 60-80 DEG C.
The method that a kind of low concentration arsenic-containing waste residue harmless treatment the most according to claim 1 and arsenic reclaim,
It is characterized in that, in step (5), add Fe by Fe:As mol ratio 2～3:12(SO4)3Solution.
The method that a kind of low concentration arsenic-containing waste residue harmless treatment the most according to claim 1 and arsenic reclaim,
It is characterized in that, one-level alkali leaching processes in step, is mixed with arsenic-containing waste residue by alkali liquor and first obtains one after solid-liquid separation
Level alkali leaching slag and 1 alkali immersion of one-level, after 1 alkali immersion of one-level supplements alkali liquor, continue on for the leaching of new arsenic-containing waste residue
Going out, obtain 2 alkali immersion of one-level, 2 alkali immersion of one-level are recycled and reused for new arsenic-containing waste residue and leach after supplementing alkali liquor,
Until alkali immersion arsenic concentration is more than 0.3～0.4g/L, enter step (5) afterwards.
The method that a kind of low concentration arsenic-containing waste residue harmless treatment the most according to claim 1 and arsenic reclaim,
It is characterized in that, two grades of alkali leachings process in step, and alkali liquor is mixed with one-level alkali leaching slag and first obtained after solid-liquid separation
Two grades of alkali leaching slags and two grades of 1 alkali immersion, after two grades of 1 alkali immersion supplement alkali liquor, continue on for one-level alkali leaching slag
Leaching, obtain two grades of 2 alkali immersion, two grades of 2 alkali immersion are recycled and reused for one-level alkali leaching slag after supplementing alkali liquor
Leach, until alkali immersion arsenic concentration is more than 1.5～2g/L, enter step (4) afterwards.
The method that a kind of low concentration arsenic-containing waste residue harmless treatment the most according to claim 1 and arsenic reclaim,
It is characterized in that, three grades of alkali leachings process in step, first obtain after alkali liquor and two grades of alkali leaching slag mixing solid-liquid separation
Three grades of alkali leaching slags and three grades of 1 alkali immersion, after three grades of 1 alkali immersion supplement alkali liquor, continue on for two grades of alkali leaching slags
Leaching, obtain three grades of 2 alkali immersion, three grades of 2 alkali immersion are recycled and reused for two grades of alkali leaching slags after supplementing alkali liquor
Leach, until alkali immersion arsenic concentration is more than 1.5～2g/L, enter step (4) afterwards.
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| CN106673069A (en) * | 2016-12-20 | 2017-05-17 | 中南大学 | Black ferric arsenate crystal and synthesis method thereof |
| CN106756114A (en) * | 2017-01-20 | 2017-05-31 | 江苏澄天环保科技有限公司 | A kind of cleaning manufacturing technique method and equipment for extracting arsenic |
| CN107352581A (en) * | 2017-08-23 | 2017-11-17 | 中南大学 | A kind of method that antimony cigarette ash pressure reduction prepares arsenic trioxide |
| CN107739837A (en) * | 2017-11-01 | 2018-02-27 | 紫金铜业有限公司 | A kind of method of the efficient dearsenification of the high arsenic smoke dust of Copper making |
| CN110306066A (en) * | 2019-07-22 | 2019-10-08 | 山东国大黄金股份有限公司 | A kind of multistage gold extracting method of the difficult tailing of gold containing arsenic |
| CN110512095A (en) * | 2019-08-21 | 2019-11-29 | 长沙矿冶研究院有限责任公司 | A method of arsenic is extracted and stablized from tungsten metallurgy phosphorus and arsenic slag |
| CN112692042A (en) * | 2020-12-08 | 2021-04-23 | 广西博世科环保科技股份有限公司 | Aluminum electrolysis cell waste refractory material treatment process and system thereof |
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| CN112692042B (en) * | 2020-12-08 | 2022-05-24 | 广西博世科环保科技股份有限公司 | Aluminum electrolysis cell waste refractory material treatment process and system thereof |
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