CN109019525A - A kind of method of hydrogen sulfide microreactor and preparation method thereof and the dearsenification of phosphoric acid solution depth and heavy metal - Google Patents
A kind of method of hydrogen sulfide microreactor and preparation method thereof and the dearsenification of phosphoric acid solution depth and heavy metal Download PDFInfo
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- CN109019525A CN109019525A CN201811183564.8A CN201811183564A CN109019525A CN 109019525 A CN109019525 A CN 109019525A CN 201811183564 A CN201811183564 A CN 201811183564A CN 109019525 A CN109019525 A CN 109019525A
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- hydrogen sulfide
- microreactor
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/16—Hydrogen sulfides
- C01B17/161—Preparation from elemental sulfur
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/234—Purification; Stabilisation; Concentration
- C01B25/237—Selective elimination of impurities
- C01B25/238—Cationic impurities, e.g. arsenic compounds
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Abstract
The invention discloses a kind of hydrogen sulfide microreactor and preparation method thereof and the dearsenification of phosphoric acid solution depth and the methods of heavy metal.Hydrogen sulfide microreactor is calcined to obtain by excess iron powder and sulphur under protective atmosphere.Hydrogen sulfide microreactor is added in phosphoric acid solution containing arsenic, hydrogen sulfide microreactor surface can slow release S2‑, S2‑With the As in phosphoric acid solution3+、As5+And heavy metal ion reaction generates precipitating to achieve the effect that the arsenic ion and heavy metal in deep purifying phosphoric acid solution, this method has arsenic and heavy metal removing high-efficient, vulcanizing agent usage amount is low, the advantages such as hydrogen sulfide burst size is low, solve in conventional vulcanized dose of use process that dosage is big, utilization rate is low, H2The problems such as S harm is serious, and the operation is simple and convenient for this method removal methods, meets industrialized production.
Description
Technical field
The present invention relates to a kind of hydrogen sulfide microreactors, and in particular to a kind of to be obtained by iron powder and sulphur by high-temperature calcination
Hydrogen sulfide microreactor, further relate to hydrogen sulfide microreactor for arsenic in the dearsenification of industrial phosphoric acid solution deep or phosphoric acid solution
And the method for heavy metal deep purifying, belong to technical field of inorganic chemical industry.
Background technique
Phosphoric acid is widely used in the every field such as medicine, chemical industry, food as chemical industry base stock.But industry is made
Phosphoric acid can not be applied to the field in addition to chemical industry since its impurity content is high.Industrial thermal phosphoric acid is yellow with industry
It is made after phosphorus (P) burning by being hydrated, such as P4+5O2→P4O10；P4O10+6H2O→4H3PO4, the arsenic in the phosphoric acid of preparation is most
It is to be brought by the raw material rock phosphate in powder of production yellow phosphorus, and is enriched in yellow phosphorus product with 10 times, with phosphorus production thermal method phosphorus
Arsenic acid (the H that arsenic generates in the process of acid3AsO4) and arsenious acid (H3AsO3) coexist in phosphoric acid.
Along with the fining of production process of phosphoric acid, either thermal phosphoric acid or Wet-process Phosphoric Acid Production all mentions purification techniques
Increasingly higher demands are gone out.Low-arsenic phosphorus acid is production food-grade, toothpaste grade, pharmaceutical grade, the important source material of feed-grade phosphate
One of, with the continuous improvement of people's living standards, demand will be increasing, thus to the industry of the thermal method of low arsenic high-quality
The demand of phosphoric acid also will be increasing.
Arsenic in phosphoric acid is with arsenious acid H3AsO3Form existing for, the main method of dearsenification at present has chemical method, electrification
Method, extraction and crystallisation etc..Wherein chemical method application is most extensive, is that the arsenic in phosphoric acid is sunk in the form of arsenones
It forms sediment and separates, the aqueous solution of addition vulcanized sodium, phosphorus pentasulfide solid or hydrogen sulfide gas usually into phosphoric acid, gas-liquid-solid three
The processing of phase is with their own characteristics, and the sulfide of that open type is either added, it is generally recognized that is worked is hydrogen sulfide i.e. following formula
Reaction carries out dearsenification:
2H3AsOs+3H2S=As2S3↓+6H2O
Currently, industrial most of all using sulfide sedimentation come dearsenification, capital equipment includes reactive tank, sedimentation
Slot, filter etc..But presently, there are Railway Projects wherein, (1) vulcanized slag containing arsenic it is relatively low, yield is big, and slag arsenic grade is 30%
Hereinafter, being unfavorable for the recycling of arsenic resource；(2) vulcanizing agent (such as vulcanized sodium) dosage is on the high side, reacts not thorough enough, processes
A large amount of H in journey2S escape not only causes processing cost increase, equipment to meet increase, but also will cause environmental pollution.Therefore,
How S is improved2-Efficient utilization, reduce H2The escape of S is most important for the processing of arsenic in phosphoric acid.Therefore, urgent need
Develop a kind of dearsenic technique efficiently, inexpensive, safe.
Summary of the invention
For the method for arsenic component in prior art removing phosphoric acid solution, there are at high cost, low efficiencys, H2Big wait of S harm lacks
It falls into, the first purpose of this invention is that be to provide one kind can be with slow release high activity S2-, and S2-Using height, without H2S harm
Hydrogen sulfide microreactor, especially suitable for micro amount of arsenic in phosphoric acid solution and the deep removal of heavy metal ion.
Second object of the present invention is to be to provide a kind of easy to operate, inexpensive to prepare the hydrogen sulfide microreactor
Method.
Third object of the present invention is to be to provide a kind of application of hydrogen sulfide microreactor, utilizes the micro- reaction of hydrogen sulfide
Device slow release high activity S2-The characteristics of, efficient, inexpensive arsenic can be removed in depth from phosphoric acid solution, relatively existing vulcanization
Agent reduces vulcanizing agent dosage, save the cost, while the problem of reduce hydrogen sulfide contamination environment, and arsenic in phosphoric acid can be contained
Amount is reduced to 0.5ppm hereinafter, reaching food-grade requirement.
Fourth object of the present invention is to be to provide a kind of utilize in hydrogen sulfide microreactor removing phosphoric acid solution with much money
The method of category or arsenic, utilizes hydrogen sulfide microreactor slow release high activity S2-The characteristics of, it can be efficient, inexpensive molten from phosphoric acid
Arsenic and heavy metal, relatively existing vulcanizing agent are removed in depth in liquid reduces vulcanizing agent dosage, save the cost, while reducing sulphur
The problem of changing hydrogen contamination environment, and arsenic in phosphoric acid solution and content of beary metal can be reduced to 0.5ppm or less.
In order to achieve the above technical purposes, the present invention provides a kind of preparation method of hydrogen sulfide microreactor, this method
Be excess iron powder and sulphur are calcined under protective atmosphere to get.
The molar ratio of preferred scheme, iron powder and sulphur is 1.2~1.5:1.Excessive iron powder can guarantee iron powder in height
Ferrous sulfide is mainly generated in warm reaction process.Hydrogen sulfide microreactor of the invention is black solid particle.
Preferred scheme, for the purity of the iron powder 90% or more, the grade of iron powder meets -400 mesh grade quality percentages
80% or more is accounted for than content.
Preferred scheme, for the purity of the sulphur 90% or more, the grade of sulphur meets -400 mesh grade quality percentages
80% or more is accounted for than content.
Preferred scheme, the temperature of calcining are 300~600 DEG C, and the time of calcining is to be fired to entire reactant red heat
Only.
Preferred scheme, protective atmosphere are nitrogen or inert atmosphere etc..
The present invention provides a kind of hydrogen sulfide microreactors, are made by above-mentioned preparation method.
Hydrogen sulfide microreactor of the invention can slowly discharge activity S in acidic solution system from surface2, by
Relatively low, the S in the solubility product of ferrous sulfide2It preferentially reacts to generate arsenones and vulcanize arsenous with the arsenic ion in solution and sink
Shallow lake phase can effectively reduce it and react with sour, so that the generation of hydrogen sulfide is reduced, in extra a small amount of ferrous ion and solution
Phosphoric acid complex-precipitation be filtered to remove, foreign ion is substantially free of in solution, obtains deep purifying.
The present invention also provides a kind of applications of hydrogen sulfide microreactor, are applied in industrial phosphoric acid as sulphur sustained release agent
The deep purifying of arsenic ion.
Industrial sulphuric acid of the invention is thermal phosphoric acid or phosphoric acid by wet process, in industrial phosphoric acid general arsenic content be 20~
100ppm.5ppm or less can be reduced to after hydrogen persulfide microreactor deep removal.
Hydrogen sulfide microreactor is added into the industrial phosphoric acid containing arsenic ion preferred scheme, in 80~90 DEG C of temperature
Lower reaction generates arsenic sulfide precipitation.Reaction time is preferably 0.5~1h.It can guarantee that hydrogen sulfide is micro- under the conditions of the temperature
Reactor surface slow release activity S2, while being conducive to the rapid precipitation of arsenic.
Preferred scheme, the dosage of the hydrogen sulfide microreactor are that arsenic ion in phosphoric acid solution is converted to corresponding pozzuolite
1.5~2.0 times of sulphur anion theoretical molar amount needed for compound；The hydrogen sulfide microreactor by it includes sulphur anion in terms of
Amount.
The present invention also provides a kind of hydrogen sulfide microreactors for the dearsenification of phosphoric acid solution depth and the method for heavy metal, should
Method is that hydrogen sulfide microreactor is added in the phosphoric acid solution containing arsenic ion and/or heavy metal ion, in 80~90 DEG C of temperature
Lower reaction settles, and is separated by solid-liquid separation, obtains one section of slag phase and one section of scavenging solution；One section of slag phase is subjected to magnetic separation separation, magnetic product
That is hydrogen sulfide microreactor, non-magnetic product, that is, pozzuolite compound and/or heavy metal sulfide；Gained magnetic product is through mechanical activation
Afterwards, it returns in one section of scavenging solution, is reacted under the conditions of 80~90 DEG C of temperature, settled, be separated by solid-liquid separation, obtain two sections of scavenging solutions and two
Section slag phase.
Preferred scheme, the hydrogen sulfide microreactor dosage are that arsenic ion and heavy metal ion are converted in phosphoric acid solution
1.5~5.0 times of sulphur anion theory integral molar quantity needed for corresponding pozzuolite compound and heavy metal sulfide；The hydrogen sulfide is micro-
Reactor with it includes sulphur anion metering.
Preferred scheme, mechanical activation use Ball-stirring mill, and the ore grinding time is 10~15min.Magnetic product is that unreacted is complete
After the agitated mill mechanical activation of full hydrogen sulfide microreactor, recycling can be returned, improves the utilization of hydrogen sulfide microreactor
Efficiency, and keep dearsenification reaction more thorough, effect of removing arsenic is more preferable.
Non-magnetic product obtained by preferred scheme, two sections of slags and one section of slag merges integrated treatment；Obtained two sections
Arsenic content can be controlled in 0.5ppm or less in scavenging solution.
The method that the present invention purifies arsenic in acid solution using hydrogen sulfide microreactor, comprising the following steps:
1) hydrogen sulfide microreactor is proportionally added in the phosphoric acid solution containing arsenic ion, it is anti-at a temperature of 80~90 DEG C
0.5~1h is answered, is settled (flocculant can be added with accelerated sedimentation), is separated by solid-liquid separation, obtains one section of slag phase and one section of scavenging solution；Institute
Stating hydrogen sulfide microreactor dosage is sulphur anion theoretical molar amount needed for generating corresponding sulfide containing arsenic ion in phosphoric acid solution
1.5~2.0 times；
2) one section of slag phase is subjected to one section of preliminary magnetic separation (magnetic field strength is 500~1000GS), isolated magnetic and non-magnetic
Property product, then will after magnetic product mechanical activation put into one section of scavenging solution in, the reaction was continued under the conditions of 80~90 DEG C, sedimentation,
It is separated by solid-liquid separation, obtains two sections of scavenging solutions and two sections of slag phases.
The method of arsenic and heavy metal in deep purifying phosphoric acid solution of the invention comprising the following specific steps
Step 1: the preparation of hydrogen sulfide microreactor
Excess iron powder and sulphur are put into reacting furnace and calcined under nitrogen protection, temperature is 300~600 DEG C, is added
Heat arrives entire reactant red heat, stops heating, obtains black solid particle, as hydrogen sulfide microreactor；
Step 2: the sustained release vulcanization of arsenic in phosphoric acid solution
Hydrogen sulfide microreactor is added in the phosphoric acid solution containing arsenic ion and heavy metal ion, the hydrogen sulfide being added is micro-
Reactor dosage is 1.5~5.0 times of theoretical amount, is stirred to react 0.5~1h, and reaction temperature is 80~90 DEG C, after the reaction was completed,
Add flocculant rapid subsidence, and be separated by filtration, obtain one section of slag phase, i.e., high arsenic heavy metal slag, filtrate is one section of scavenging solution；
Step 3: the magnetic separation separation of one section of slag
One section of slag phase is subjected to one section of preliminary magnetic separation, isolates magnetic and non-magnetic product, the magnetic used during magnetic separation
Field intensity is 500~1000GS, and non-magnetic product is the arsenic slag precipitated phase of fully reacting, and magnetic product is the sufficient sulphur of unreacted
Change hydrogen microreactor；
Step 4: the deep purifying of phosphoric acid solution
One section of slag phase is subjected to one section of preliminary magnetic separation, isolates magnetic and non-magnetic product, then by magnetic product by stirring
Mill mechanical activation is mixed, is put into one section of scavenging solution, the reaction was continued under the conditions of 80~90 DEG C, settles, and is separated by solid-liquid separation, obtains two sections
Scavenging solution and two sections of slag phases；Two sections of slags are merged into one section of slag and carry out comprehensive utilization or safe handling, arsenic content in two sections of scavenging solutions
0.5ppm or less can be down to.
Compared with the prior art, technical solution of the present invention bring advantageous effects:
1) hydrogen sulfide microreactor of the invention has and is sustained S in strongly acidic solution2-The characteristics of, H can be reduced2S
Harm, improves the utilization rate of vulcanizing agent, can not only reduce the use cost of vulcanizing agent, and reduce the harm to environment；Solution
Vulcanizing agent dosage is big, utilization rate is low, H in the vulcanizing agents such as certainly conventional vulcanized sodium vulcanization arsenic removal process2The problems such as S harm is serious,
2) hydrogen sulfide microreactor preparation method of the invention is simple, and raw material sources are wide, are conducive to industrialized production.
3) hydrogen sulfide microreactor of the invention is for arsenic in industrial phosphoric acid solution, not only to the deep purifying effect of arsenic
It is good, and the release of hydrogen sulfide gas is reduced, while decreasing the usage amount of vulcanizing agent, the application for meeting existing industry is wanted
It asks.
4) arsenic and a huge sum of money in phosphoric acid solution may be implemented in the method for deep purifying phosphoric acid solution arsenic of the invention and heavy metal
The deep removal of category, and realize and efficiently separate and recycle, greatly improve the grade of arsenic in slag phase, while the usage amount of vulcanizing agent
Few, the harmful gas emissions such as hydrogen sulfide are low, are conducive to industrialized production.
Detailed description of the invention
Fig. 1 is industrial phosphoric acid dearsenification flow chart.
Specific embodiment
Following embodiment is intended to further illustrate the content of present invention, rather than limits the scope of the invention.
Embodiment 1
Certain industrial phosphoric acid is handled using this process, the specific steps are as follows: takes a certain amount of industrial phosphoric acid (H3PO4Content
It is 105%, arsenic content 50ppm), take a certain amount of iron powder and the sulphur nitrogen protection at 300 DEG C to be fired to black solid particle,
The molar ratio of iron powder and sulphur is 1.2, and the granularity of iron powder and sulphur is to account for 90% less than 38 microns, and hydrogen sulfide obtained is micro-
During reactor pours into, temperature is set as 85 DEG C, mixing speed 150r/min, sufficiently reacts a hour, the micro- reaction of hydrogen sulfide
The additional amount of device is 3 times of calculated value, and one section of precipitation slag and one section of scavenging solution is obtained by filtration in reaction later.Then to one section
Precipitation slag carries out wet magnetic separation, isolates magnetic product and non-magnetic product, magnetic field strength 500GS.Magnetic product is agitated
Mill activation 10min, puts into one section of scavenging solution that the reaction was continued half an hour, and reaction condition is same as above.Two sections of slags are obtained by filtration later
With two sections of scavenging solutions, two sections of slags merge with one section of slag carries out safe handling.
Arsenic content is 0.1ppm in two sections of scavenging solutions, and arsenic-removing rate 99.8% meets the requirement of phosphoric acid for food 0.5ppm.
Embodiment 2
Certain industrial phosphoric acid is handled using this process, the specific steps are as follows: takes a certain amount of industrial phosphoric acid (H3PO4Content
It is 109%, arsenic content 85ppm), take a certain amount of iron powder and the sulphur nitrogen protection at 500 DEG C to be fired to black solid particle,
The molar ratio of iron powder and sulphur is 1.2, and the granularity of iron powder and sulphur is to account for 90% less than 38 microns, and hydrogen sulfide obtained is micro-
During reactor pours into, temperature is set as 90 DEG C, mixing speed 300r/min, sufficiently reacts a hour, the micro- reaction of hydrogen sulfide
The additional amount of device is 2 times of calculated value, and one section of precipitation slag and one section of scavenging solution is obtained by filtration in reaction later.Then to one section
Precipitation slag carries out wet magnetic separation, isolates magnetic product and non-magnetic product, magnetic field strength 750GS.Magnetic product is agitated
Mill activation 15min, puts into one section of scavenging solution that the reaction was continued half an hour, and reaction condition is same as above.Two sections of slags are obtained by filtration later
With two sections of scavenging solutions, two sections of slags merge with one section of slag carries out safe handling.
Arsenic content is 0.3ppm in two sections of scavenging solutions, and arsenic-removing rate 99.65% meets wanting for phosphoric acid for food 0.5ppm
It asks.
Embodiment 3
Certain industrial phosphoric acid is handled using this process, the specific steps are as follows: takes a certain amount of industrial phosphoric acid (H3PO4Content
It is 115%, arsenic content 20ppm), take a certain amount of iron powder and the sulphur nitrogen protection at 600 DEG C to be fired to black solid particle,
The molar ratio of iron powder and sulphur is 1.5, and the granularity of iron powder and sulphur is to account for 90% less than 38 microns, and hydrogen sulfide obtained is micro-
During reactor pours into, temperature is set as 80 DEG C, mixing speed 150r/min, sufficiently reacts a hour, the micro- reaction of hydrogen sulfide
The additional amount of device is 5 times of calculated value, and one section of precipitation slag and one section of scavenging solution is obtained by filtration in reaction later.Then to one section
Precipitation slag carries out wet magnetic separation, isolates magnetic product and non-magnetic product, magnetic field strength 1000GS.Magnetic product is agitated
The reaction was continued in mill activation 12min one section of scavenging solution of investment half an hour, and reaction condition is same as above.Be obtained by filtration later two sections of slags and
Two sections of scavenging solutions, two sections of slags merge with one section of slag carries out safe handling.
Arsenic content is 0.07ppm in two sections of scavenging solutions, and arsenic-removing rate 99.85% meets wanting for phosphoric acid for food 0.5ppm
It asks.
Embodiment 4
Certain industrial phosphoric acid is handled using this process, the specific steps are as follows: takes a certain amount of industrial phosphoric acid (H3PO4Content
It is 115%, arsenic content 70ppm, copper content 50ppm, lead content 45ppm), take a certain amount of iron powder and the sulphur nitrogen at 600 DEG C
Gas shielded is fired to black solid particle, and the molar ratio of iron powder and sulphur is 1.5, and the granularity of iron powder and sulphur is micro- less than 38
Rice accounts for 90%, and hydrogen sulfide microreactor obtained poured into, and temperature is set as 80 DEG C, mixing speed 150r/min, sufficiently
It reacts a hour, the additional amount of hydrogen sulfide microreactor is 5 times of calculated value, and one section of precipitating is obtained by filtration later in reaction
Slag and one section of scavenging solution.Then wet magnetic separation is carried out to one section of precipitation slag, isolates magnetic product and non-magnetic product, magnetic field is strong
Degree is 1000GS.Magnetic product agitated mill activation 12min puts into one section of scavenging solution that the reaction was continued half an hour, reaction condition
Ibid.Two sections of slags and two sections of scavenging solutions are obtained by filtration later, two sections of slags merge with one section of slag carries out safe handling.
Arsenic content is 0.12ppm in two sections of scavenging solutions, and arsenic-removing rate 99.83% meets wanting for phosphoric acid for food 0.5ppm
It asks, copper content 0.32ppm, lead content 0.89ppm, achievees the purpose that remove heavy metal.
Comparative example 1
Certain industrial phosphoric acid is handled using this process, the specific steps are as follows: takes a certain amount of industrial phosphoric acid (H3PO4Content
It is 105%, arsenic content 98ppm), take a certain amount of iron powder and the sulphur nitrogen protection at 600 DEG C to be fired to black solid particle,
The molar ratio of iron powder and sulphur is 1.5, and the granularity of iron powder and sulphur is to account for 90% less than 38 microns, and hydrogen sulfide obtained is micro-
During reactor pours into, temperature is set as room temperature (25 DEG C), mixing speed 150r/min, sufficiently reacts a hour, hydrogen sulfide
The additional amount of microreactor is 2 times of calculated value, and one section of precipitation slag and one section of scavenging solution is obtained by filtration in reaction later.Then
Wet magnetic separation is carried out to one section of precipitation slag, isolates magnetic product and non-magnetic product, magnetic field strength 1000GS.Magnetic product
The reaction was continued in agitated mill activation 10min one section of scavenging solution of investment half an hour, and reaction condition is same as above.Two are obtained by filtration later
Section slag and two sections of scavenging solutions, two sections of slags merge with one section of slag carries out safe handling.
Arsenic content is 32ppm in two sections of scavenging solutions, and arsenic-removing rate 67.35% does not meet wanting for phosphoric acid for food 0.5ppm
It asks.
In conjunction with attached drawing, the embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned
Embodiment within the knowledge of a person skilled in the art can also be before not departing from present inventive concept
Put that various changes can be made.
Claims (10)
1. a kind of preparation method of hydrogen sulfide microreactor, it is characterised in that: by excess iron powder and sulphur under protective atmosphere into
Row calcining to get.
2. the preparation method of hydrogen sulfide microreactor according to claim 1, it is characterised in that: mole of iron powder and sulphur
Than for 1.2~1.5:1.
3. the preparation method of hydrogen sulfide microreactor according to claim 1 or 2, it is characterised in that: the iron powder it is pure
90% or more, the grade of iron powder meets -400 mesh grade mass percentage contents and accounts for 80% or more degree；The purity of the sulphur
90% or more, the grade of sulphur meets -400 mesh grade mass percentage contents and accounts for 80% or more.
4. the preparation method of hydrogen sulfide microreactor according to claim 1 or 2, it is characterised in that: the temperature of the calcining
Degree is 300~600 DEG C, and the time of calcining is until being fired to entire reactant red heat.
5. a kind of hydrogen sulfide microreactor, it is characterised in that: be made by any one of Claims 1 to 4 preparation method.
6. the application of hydrogen sulfide microreactor described in claim 5, it is characterised in that: be applied to industrial phosphorus as sulphur sustained release agent
The deep purifying of arsenic ion in acid.
7. the application of hydrogen sulfide microreactor according to claim 6, it is characterised in that: hydrogen sulfide microreactor to be added
It in the industrial phosphoric acid containing arsenic ion, is reacted at a temperature of 80~90 DEG C, generates arsenic sulfide precipitation；The micro- reaction of hydrogen sulfide
The dosage of device be sulphur anion theoretical molar amount needed for arsenic ion in phosphoric acid solution is converted to corresponding pozzuolite compound 1.5~
2.0 again；The hydrogen sulfide microreactor with it includes sulphur anion metering.
8. hydrogen sulfide microreactor described in claim 5 is for the dearsenification of phosphoric acid solution depth and the method for heavy metal, feature
It is: hydrogen sulfide microreactor is added in the phosphoric acid solution containing arsenic ion and/or heavy metal ion, at a temperature of 80~90 DEG C
Reaction settles, and is separated by solid-liquid separation, obtains one section of slag phase and one section of scavenging solution；One section of slag phase is subjected to magnetic separation separation, magnetic product is
Hydrogen sulfide microreactor, non-magnetic product, that is, pozzuolite compound and/or heavy metal sulfide；Gained magnetic product is through mechanical activation
Afterwards, it returns in one section of scavenging solution, is reacted under the conditions of 80~90 DEG C of temperature, settled, be separated by solid-liquid separation, obtain two sections of scavenging solutions and two
Section slag phase.
9. the method that hydrogen sulfide microreactor according to claim 8 is used for the dearsenification of phosphoric acid solution depth and heavy metal,
Be characterized in that: the hydrogen sulfide microreactor dosage is that arsenic ion and heavy metal ion are converted to corresponding pozzuolite in phosphoric acid solution
1.5~5.0 times of sulphur anion theory integral molar quantity needed for closing object and heavy metal sulfide；
The hydrogen sulfide microreactor with it includes sulphur anion metering.
10. the method that hydrogen sulfide microreactor according to claim 8 is used for the dearsenification of phosphoric acid solution depth, feature exist
In:
The mechanical activation uses Ball-stirring mill, and the ore grinding time is 10~15min.
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| CN109019525B (en) | 2020-12-22 |
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