CN107352560A - Ted technique in a kind of salt pan of the low potassium sulfate type bittern of high magnesium - Google Patents
Ted technique in a kind of salt pan of the low potassium sulfate type bittern of high magnesium Download PDFInfo
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- CN107352560A CN107352560A CN201710548077.6A CN201710548077A CN107352560A CN 107352560 A CN107352560 A CN 107352560A CN 201710548077 A CN201710548077 A CN 201710548077A CN 107352560 A CN107352560 A CN 107352560A
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- bittern
- potassium
- epsomite
- carnallite
- salt
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/06—Preparation of sulfates by double decomposition
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/12—Preparation of double sulfates of magnesium with sodium or potassium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/26—Magnesium halides
- C01F5/30—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/40—Magnesium sulfates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Abstract
Technique is tedded in a kind of salt pan of the low potassium sulfate type bittern of high magnesium, is comprised the following steps：（1）The low potassium sulfate type bittern of high magnesium is imported into sodium chloride salt pan, tedded naturally, is selected when bittern and reaches epsomite saturation and when starting to separate out epsomite, bittern is imported into epsomite salt pan；（2）By bittern evaporation, when to epsomite amount of precipitation being 40 80wt%, bittern is imported into one-level carnallite salt pan；（3）When by bittern evaporation to carnallite amount of precipitation being 40% -60wt%, bittern is imported into two level carnallitite field；（4）Bittern is continued to evaporate, carnallite continues to separate out, and after bittern reaches old halogen point, bittern is imported into old halogen field；（5）One-level carnallite is crushed, decomposed, dehalogenation.The present invention produces high-quality potassium sulfate using the low potassium sulfate type bittern of high magnesium that can only produce potassium chloride originally, lifts the resource exploitation rate and added value of product of the type salt lake and subsurface brine resource.
Description
Technical field
The present invention relates to a kind of salt pan of the low potassium sulfate type bittern of high magnesium to ted technique, belongs to salt chemical engineering technology neck
Domain.
Background technology
The soluble potassium salt rich content in Chinese sulfate type sylvite lake, it is the important source material for producing potassium sulfate.Utilize sulphur
Hydrochlorate type bittern produces potassium sulfate, is all the technique tedded by salt pan phase detachment technique i.e. salt pan both at home and abroad at present to realize.
Salt pan phase detachment technique is using solar radiation as the energy, in the large area pond built with specific structure, saves appropriate depth
Bittern, during solar energy is absorbed, due to the heat chemistry accumulated energy effect of salting liquid, temperature rise, be advantageous to moisture steaming
Hair, bittern are concentrated to a certain salinity and reach the saturation degree under the temperature conditionss, in addition it is supersaturated when, the component is with solid salt
（Or hydrated salt, or even water complex salt）Form separate out, reach the purpose of certain salt that is separated from multi-component complex bittern.
The bittern that existing bittern production potassium sulfate enterprise of China uses, substantially belongs to magnesium sulfate bittern, in west
Under the weather conditions in backlands area, the main evaporation route that salt pan is tedded is typically all to be evaporated according to evaporative crystallization rule, bittern
During flow through sodium chloride salt pan --- epsomite salt pan --- potassium magnesium mixed salt salt pan --- carnallite salt pan --- old halogen successively
Salt pan, and separate out corresponding salt in each salt pan.Wherein, for producing the main raw material i.e. potassium magnesium mixed salt of potassium sulfate（Mainly into
It is divided into sodium chloride, epsomite and potassium chloride）With carnallite type mixed salt（Main component is sodium chloride, epsomite and carnallite）.And
Potassium sulfate is produced using these salt, then the technique for mainly employing substep synthesis.I.e. potassium magnesium mixed salt carries out conversion and prepares soft potassium magnesium
Alum, carnallite decompose production potassium chloride, then convert production potassium sulfate again by potassium chloride and picromerite.
In the prior art, Chinese patent CN 100383045C disclose a kind of potassium for evaporating to obtain with sulfate brine
Mixed salt is the method that raw material produces potassium sulfate, and the technological process of this method is conversion screening, filtering, potassium sulfate synthesis, crosses and is filtered dry
Dry that four processes of product, the soft potassium mother liquor that filter progress obtains obtain low-sodium carnalite through converting halogen process, low-sodium carnalite is through dividing
Solution filters to obtain solid potassium chloride and potassium chloride mother liquor, and solid potassium chloride enters potassium sulfate synthesis procedure.
CN 1817794A disclose a kind of using the potassium mixed salt of sulfate brine production and carnallite as raw material production potassium sulfate
Method.This method by the potassium mixed salt for the system of shining it is inverted, decompose and flotation obtains picromerite, then with carnallite through plus moisture
The potassium chloride that solution, flotation obtain adds water Synthesis potassium sulfate.
Prior art disclosure satisfy that the requirement of magnesium sulfate bittern containing potassium production potassium sulfate, but it is only applicable to magnesium ion
The magnesium sulfate raw brine that content is relatively low and potassium content is of a relatively high.And for the bittern of some Salt Lake Areas, by
In its magnesium ion content, high while potassium content is relatively low, then does not apply to.Because prior art requires that salt Tanaka needs
The corresponding potassium mixed salt of output and carnallite, wherein potassium mixed salt are exactly mainly Shoenite and potassium chloride containing potassium composition, and real
In the production of border, it is desirable to which potassium content reaches more than 8% in potassium mixed salt.And for the low potassium sulfate type bittern of high magnesium, when bittern steams
When being dealt into the precipitation of component containing potassium, bittern composition is selected is located away from what potassium chloride, Shoenite and epsomite were satisfied altogether on phasor
On the potassium chloride and epsomite saturated line of three phase point or reach epsomite, carnallite, potassium chloride three phase point, even up to rush down profit
On the saturated line of salt and carnallite.In evaporation process, the bittern in such composition point will not separate out Shoenite, only analyse
Go out a small amount of potassium chloride salt or do not separate out potassium chloride salt.Therefore, in the entirely salt field process of evaporation route, if continued to use existing
There are the salt pan hierarchical pattern and follow-up processing technology that technology is taken, then in the case where potassium chloride does not separate out, can not obtain
Produce the potassium magnesium mixed salt needed for potassium sulfate；And in the case where there is a small amount of potassium chloride to separate out, in order to ensure potassium ion in mixed salt
Content, the yield of the potassium magnesium mixed salt of obtained qualified grade are very low, it is impossible to are matched with back segment carnallite amount.In potassium magnesium
In the case that mixed salt lacks or yield can not match with carnallite, according to prior art, the low potassium sulfate type of high magnesium
Bittern can not directly produce potassium product or only produce minimal amount of potassium product, and then and cause carnallite resource
Surplus, Brine resources can not the high products of output added value.Current solution, usually utilize the salt lake bittern of the type
Directly prepare and be worth lower potassium chloride.
The content of the invention
The technical problem to be solved in the present invention is overcome the deficiencies in the prior art, there is provided a kind of low potassium sulfate type of high magnesium
Ted technique in the salt pan of bittern.
The present invention solves the technical scheme that its technical problem uses：A kind of low potassium sulfate type bittern production sulfuric acid of high magnesium
Technique is tedded in the salt pan of potassium, is comprised the following steps：
（1）The low potassium sulfate type bittern of high magnesium is imported into sodium chloride salt pan, precipitated sodium chloride is tedded naturally, is rushed down when bittern point reaches
Sharp salt loading and when starting to separate out epsomite, epsomite salt pan is imported by bittern；The mineral that sodium chloride salt pan separates out are sodium chloride；
（2）The bittern evaporation in epsomite salt pan will be imported, when to epsomite amount of precipitation be 40-80wt%, by bittern importing one
Level carnallite salt pan, the mixed salt that the mineral that epsomite salt pan separates out are made up of sodium chloride and epsomite；
（3）When bittern evaporation to carnallite amount of precipitation by importing one-level carnallite salt pan is 40% -60wt%, by bittern
It imported into two level carnallitite field；In this step evaporation process, when bittern, which reaches potassium saturation, separates out sylvite, bittern point is in chlorination
On potassium and epsomite saturated line or in the three-phase total saturation point of potassium chloride, epsomite and carnallite, then one-level carnallitite
It is sodium chloride, epsomite, potassium chloride, the mixed salt of carnallite that field, which separates out mineral,；If bittern reaches potassium saturation precipitation sylvite, bittern
Select on the saturated line of epsomite and carnallite, then it is sodium chloride, epsomite and carnallite that one-level carnallite salt pan, which separates out mineral,
Mixed salt；The mixed salt mineral abbreviation one-level carnallite that one-level carnallite salt pan obtains；
（4）The bittern for importing two level carnallitite field is continued to evaporate, carnallite continues to separate out, after bittern reaches old halogen point,
Bittern is imported into old halogen field；Two level carnallitite field separates out the mixed salt that mineral are sodium chloride, epsomite and carnallite, secondary light
The mineral abbreviation two level carnallite that halogen halite field obtains；
（5）By step（3）After gained one-level carnallite is broken, add water or brackish water decomposition, dehalogenation, that is, obtain potassium magnesium and mix
Salt, it is mainly formed as sodium chloride, epsomite and potassium chloride.
By the processing of above step, one-level carnallite can be used as the qualified potassium magnesium mixed salt of Synthesis Shoenite
Raw material, two level carnallite, which then turns into, decomposes the raw material that flotation obtains potassium chloride, and two kinds of raw materials can utilize existing process to produce
Go out high-quality potassium sulfate.
Further, step（1）In, the low potassium sulfate type bittern of the high magnesium, refer to mainly contain K+、Na+、Mg2+、Cl-、
SO4 2-The salt lake bittern or subsurface brine of ion.Other impurities mass of ion fraction summation is no more than raw brine quality
0.5%。
Further, step（1）In, the low potassium sulfate type bittern of the high magnesium, is the bittern with following property：That is the halogen
Water is in evaporation process, and when reaching potassium ion saturation precipitation sylvite, its bittern composition point is located at Na+、K+、Mg2+//Cl-、
SO4 2-—H2On epsomite and carnallite saturated line in O quinary system phasors；Or positioned at epsomite, potassium chloride and light
The three-phase total saturation point of halogen stone；Or close to epsomite, potassium chloride and carnallite three-phase on epsomite and potassium chloride saturated line
One section of total saturation point, the segment length are less than the 50% of epsomite and potassium chloride saturated line total length, particularly less than 30%.
Further, the evaporation process of the technical field of the invention salt-water system is typically all represented and counted using phasor
Calculate, brine systems of the present invention belong to Na+、K+、Mg2+//Cl-、SO4 2-—H2O quinary systems, the phasor of the system are used
Ye Nieke indexes come show bittern form point.Step of the present invention（1）Described in the low potassium sulfate type bittern of high magnesium, actually refer to
The bittern point of a certain special area on phasor, and at different temperatures, the specific region residing for bittern point is incomplete same,
Illustrated below with Ye Nieke index ranges under different temperatures：
Exemplified by carrying out salt pan evaporation at 25 DEG C, the low potassium sulfate type bittern of the high magnesium refers to：When the bittern evaporation is to containing potassium
When component separates out, meet potassium ion Ye Nieke indexes 0.1<J2k<8.0, magnesium ion Ye Nieke index 91.2>JMg>76.5；Especially
It is potassium ion Ye Nieke indexes 3.5<J2k<7.2, magnesium ion Ye Nieke index 85.4>JMg>78.5 bittern.
Exemplified by carrying out salt pan evaporation at 15 DEG C, when the low potassium sulfate type bittern of the high magnesium refers to：When the bittern evaporation
When being separated out to component containing potassium, potassium ion Ye Nieke indexes 0.2 should be met<J2k<7.7, magnesium ion Ye Nieke index 91.9>JMg>
78.6；Particularly potassium ion Ye Nieke indexes 2.6<J2k<6.8, magnesium ion Ye Nieke index 88.7>JMg>81.3。
Further, step（1）Described in bittern, refer to potassium concentration in 0.1wt%~1.5wt%, magnesium ion concentration
In 0.5wt%~8.0wt%, and magnesium ion concentration and potassium concentration ratio are 2~60 ︰ 1, at the same magnesium ion concentration and sulfate radical from
Sub- concentration is 0.25~2.8 ︰ 1 bittern.Potassium concentration is particularly related in 0.2wt%~1.5wt%, magnesium ion concentration to exist
2.0wt%~7.0wt%, and magnesium ion concentration and potassium concentration ratio are 4.5~40 ︰ 1, at the same magnesium ion concentration and sulfate radical from
Sub- concentration is 0.30~2.1 ︰ 1 bittern.
Further, step（2）In, the mass fraction of epsomite precipitation, refer to that this grade of salt pan separates out epsomite quality and account for halogen
Epsomite salt pan and one-level carnallite salt pan separate out the mass percent of epsomite total amount during water evaporation.
Further, step（3）In, carnallite separates out mass fraction, refers to that this grade of salt pan separates out carnallite quality and account for bittern
The mass percent for the carnallite total amount that one-level carnallite salt pan, two level carnallitite Tanaka are separated out in evaporation process.
Further, step（5）In, the addition of the brackish water or water, it is the 25%~40% of one-level carnallite quality.
Further, step（5）In, the brackish water is salt content≤5wt% water.
The invention provides a kind of salt pan of the low potassium sulfate type bittern production potassium sulfate of high magnesium to ted technique, for such
Salt lake bittern, the present invention proposes that stage division is tedded in a kind of new salt pan, and is shone to how new salt pan being tedded into grading technology
The raw material that the mineral gone out are processed into production high-quality potassium sulfate proposes further method.It is low for high magnesium of the prior art
Potassium sulfate type bittern can not obtain potassium magnesium mixed salt or potassium magnesium mixed salt yield is very low, can not be obtained with follow-up carnallite salt pan
The defects of carnallite matching obtained produces qualified potassium sulfate, the present invention proposes following solution：By the low potassium sulfate type of high magnesium
Bittern salt pan, which is tedded, is divided into sodium chloride salt pan --- epsomite salt pan --- one-level carnallite salt pan --- two level carnallitite
Field --- old five parts in halogen field, wherein first order salt pan and afterbody salt pan and existing process technology scheme purpose one
Cause is using the Isolating chlorinated sodium in primary salt pan and utilizes the old halogen of final stage salt pan storage, and the epsomite salt pan in this programme, and one
Level carnallite salt pan and two level carnallitite field, then it is adjusted for the raw material needed for potassium sulfate synthesis, it is follow-up to obtain
The mixed salt that production line needs.
Its advantage is as follows：
（1）The present invention solves the key technical problem that the low potassium sulfate type bittern of high magnesium can not directly produce potassium sulfate.
（2）The present invention produces potassium sulfate using the low potassium sulfate type bittern of high magnesium that can only produce potassium chloride originally, carries
The resource exploitation rate and added value of product of the type salt lake and subsurface brine resource are risen.
（3）Processing step of the present invention（3）, due in upper level epsomite salt pan and next stage two level carnallitite
Field, which has to be adjusted flexibly, leads halogen point, thus the potassium content of the one-level carnallite obtained and sulphur potassium ratio are all to adjust
Whole, this flexible salt pan mineralizing genesis can meet under different working conditions（Such as high temperature season and low temperature season
Change, the change of Brine resources in itself）Keep the requirement of steady production；
（4）Step of the present invention（5）The potassium magnesium mixed salt prepared by one-level carnallite obtained, because sulphur potassium is than controllable so that its
The technical process for the Shoenite that conversion production obtains is controllable, and the quality of Shoenite is higher；Step of the present invention simultaneously（4）Obtained
The two level carnallite obtained is the product that bittern evaporation separates out carnallite back segment, is a kind of typical low-sodium carnalite, utilizes low sodium
The potassium chloride concentrate purity that carnallite prepares potassium sulfate acquisition is higher；The Shoenite of high quality and the potassium chloride concentrate of high-purity
So that the potassium sulfate quality of synthesis is higher.
Brief description of the drawings
Fig. 1 is Na at 15 DEG C+、K+、Mg2+//Cl-、SO4 2-—H2O quinary system phasors；
Fig. 2 is Na at 25 DEG C+、K+、Mg2+//Cl-、SO4 2-—H2O quinary system phasors；
Part shown in shade is the bittern point position that technical solution of the present invention is suitable to processing in figure.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Comparative example 1：
Weight/mass percentage composition composition is K+ 0.53%、Mg2+ 2.6%、Cl- 16.3%、SO4 2- 2.0%、Na+ 6.2%、H2O
72.17%th, the low potassium sulfate type original halogen of the high magnesium of other impurities 0.2%, at 15 DEG C natural evaporation to potassium ion saturation separate out potassium
During salt, bittern point potassium ion Ye Nieke indexes J2k=5.8, magnesium ion Ye Nieke indexes JMg=84.1, its bittern composition point is located at
15℃ Na+、K+、Mg2+//Cl-、SO4 2-—H2It is close on epsomite and potassium chloride saturated line in O quinary system phasors to rush down
One section of sharp salt, potassium chloride and carnallite three-phase total saturation point, if now according to prior art, make bittern after sodium chloride salt pan,
Epsomite salt pan, potassium mixed salt salt pan and carnallite salt pan are tedded, and are ensureing that potassium mixed salt salt pan mineral potassium concentration is 8%
Under the premise of, although corresponding potassium mixed salt and carnallite can be obtained, the amount of potassium mixed salt is extremely low, and the mass ratio of the two is light halogen
Stone：Potassium mixed salt=10.8:1, and utilize the carnallite needed for existing process technology production potassium sulfate：Potassium mixed salt mass ratio be 1.3~
1.6:1, carnallite amount and potassium ores amount seriously mismatch, therefore most carnallites are only used for producing potassium chloride.
Embodiment 1：Former halogen used in the present embodiment（The low potassium sulfate type bittern of i.e. high magnesium）It is identical with comparative example 1；At 15 DEG C
Under ted.
（1）The low potassium sulfate type bittern of high magnesium is imported into sodium chloride salt pan, precipitated sodium chloride is tedded naturally, when bittern point reaches
When to epsomite saturation and starting to separate out epsomite, bittern is imported into epsomite salt pan；The mineral that sodium chloride salt pan separates out are chlorine
Change sodium；（2）The bittern evaporation in epsomite salt pan will be imported, when to epsomite amount of precipitation being 45wt%, bittern is imported into one-level
Carnallite salt pan, the mixed salt that the mineral that epsomite salt pan separates out are made up of sodium chloride and epsomite；
（3）When bittern evaporation to carnallite amount of precipitation by importing one-level carnallite salt pan is 50wt%, bittern is imported into
Two level carnallitite field；In this step evaporation process, when bittern reaches potassium saturation precipitation sylvite, bittern is selected in epsomite and light halogen
On the saturated line of stone, one-level carnallite salt pan separates out the mixed salt that mineral are sodium chloride, epsomite and carnallite；One-level carnallitite
The mixed salt mineral abbreviation one-level carnallite that field obtains；
（4）The bittern for importing two level carnallitite field is continued to evaporate, carnallite continues to separate out, after bittern reaches old halogen point,
Bittern is imported into old halogen field；Two level carnallitite field separates out the mixed salt that mineral are sodium chloride, epsomite and carnallite, secondary light
The mineral abbreviation two level carnallite that halogen halite field obtains；
（5）By step（3）After gained one-level carnallite is broken, adds the water decomposition equivalent to one-level carnallite quality 40%, take off
Halogen, that is, potassium magnesium mixed salt is obtained, it is mainly formed as sodium chloride, epsomite and potassium chloride.Potassium magnesium mixed salt potassium ion mass ratio is
9.2%, the two level carnallite and the mass ratio of potassium magnesium mixed salt that two level carnallitite field obtains are 1.5：1；
By step（5）The inverted reaction of potassium magnesium mixed salt of acquisition obtains Shoenite concentrate, and its potassium content is reachable
16.0wt%, sulfate ion content 40.4wt%；Two level carnallite decomposes flotation and obtains potassium chloride concentrate, its potassium content
For 34.1 wt %, sodium ions content is only 1.9wt%；What Shoenite concentrate and potassium chloride concentrate were produced using existing process
In potassium product, potassium oxide（K2O）Mass fraction be 53.8%, be top grade product agricultural potassium sulfate.
Comparative example 2：
Weight/mass percentage composition composition is K+ 0.42%、Mg2+ 2.9%、Cl- 15.0%、SO4 2- 2.8%、Na+ 5.2%、H2O
73.28%th, the low potassium sulfate type original halogen of the high magnesium of other impurities 0.4%, at 15 DEG C natural evaporation to potassium ion saturation sylvite analyse
When going out, bittern point potassium ion Ye Nieke indexes J2k=4.6, magnesium ion Ye Nieke indexes JMg=83.6, its bittern composition point is located at
25℃ Na+、K+、Mg2+//Cl-、SO4 2-—H2Epsomite in O quinary system phasors and on the saturated line of carnallite, this
Shi Ruo teds technique according to the salt pan of prior art, then due in whole evaporation process, all without Shoenite and potassium chloride
Precipitation, therefore actually potassium mixed salt lacks completely, and the potassium-bearing mineral of gained only has carnallite, and prior art is typically used up
Halogen stone produces potassium chloride.
Embodiment 2
Former halogen used in the present embodiment（The low potassium sulfate type bittern of i.e. high magnesium）It is identical with comparative example 2；Tedded at 25 DEG C.
（1）The low potassium sulfate type bittern of high magnesium is imported into sodium chloride salt pan, precipitated sodium chloride is tedded naturally at 25 DEG C, when
Bittern is selected when reaching epsomite saturation and starting to separate out epsomite, and bittern is imported into epsomite salt pan；What sodium chloride salt pan separated out
Mineral are sodium chloride；
（2）The bittern evaporation in epsomite salt pan will be imported, when to epsomite amount of precipitation being 65wt%, bittern is imported into one-level
Carnallite salt pan, the mixed salt that the mineral that epsomite salt pan separates out are made up of sodium chloride and epsomite；
（3）When bittern evaporation to carnallite amount of precipitation by importing one-level carnallite salt pan is 40wt%, bittern is imported into
Two level carnallitite field；When bittern, which reaches potassium saturation, separates out sylvite, bittern is selected on the saturated line of epsomite and carnallite, and one
Level carnallite salt pan separates out the mixed salt that mineral are sodium chloride, epsomite and carnallite；The mixed salt ore deposit that one-level carnallite salt pan obtains
Thing abbreviation one-level carnallite；
（4）The bittern for importing two level carnallitite field is continued to evaporate, carnallite continues to separate out, after bittern reaches old halogen point,
Bittern is imported into old halogen field；Two level carnallitite field separates out the mixed salt that mineral are sodium chloride, epsomite and carnallite, secondary light
The mineral abbreviation two level carnallite that halogen halite field obtains；
（5）By step（3）After gained one-level carnallite is broken, adds the water decomposition equivalent to one-level carnallite quality 34%, take off
Halogen, that is, potassium magnesium mixed salt is obtained, it is mainly formed as sodium chloride, epsomite and potassium chloride；Potassium magnesium mixed salt potassium ion mass content is
9.2%, the carnallite and the mass ratio of potassium magnesium mixed salt that two level carnallitite field obtains are 1.4：1.
By step（5）The inverted reaction of potassium magnesium mixed salt of acquisition obtains Shoenite concentrate, and its potassium concentration is reachable
16.0%, sulfate ion concentration 40.4%；Two level carnallite decomposes flotation and obtains potassium chloride concentrate, and its potassium concentration is
30.5%, sodium ion is only 2.93%；The potassium product that Shoenite concentrate and potassium chloride concentrate are produced using existing process
Potassium oxide（K2O）Mass fraction be 53.6%, be top grade product agricultural potassium sulfate.
Claims (10)
1. technique is tedded in a kind of salt pan of the low potassium sulfate type bittern of high magnesium, it is characterised in that is comprised the following steps：
（1）The low potassium sulfate type bittern of high magnesium is imported into sodium chloride salt pan, precipitated sodium chloride is tedded naturally, is rushed down when bittern point reaches
Sharp salt loading and when starting to separate out epsomite, epsomite salt pan is imported by bittern；The mineral that sodium chloride salt pan separates out are sodium chloride；
（2）The bittern evaporation in epsomite salt pan will be imported, when to epsomite amount of precipitation be 40-80wt%, by bittern importing one
Level carnallite salt pan, the mixed salt that the mineral that epsomite salt pan separates out are made up of sodium chloride and epsomite；
The mass fraction that epsomite separates out, refer to that this grade of salt pan separates out epsomite quality and account for epsomite salt pan during bittern evaporation
The mass percent of epsomite total amount is separated out with one-level carnallite salt pan；
（3）When bittern evaporation to carnallite amount of precipitation by importing one-level carnallite salt pan is 40% -60wt%, by bittern
It imported into two level carnallitite field；In this step evaporation process, when bittern, which reaches potassium saturation, separates out sylvite, bittern point is in chlorination
On potassium and epsomite saturated line or in the three-phase total saturation point of potassium chloride, epsomite and carnallite, then one-level carnallitite
It is sodium chloride, epsomite, potassium chloride, the mixed salt of carnallite that field, which separates out mineral,；If bittern reaches potassium saturation precipitation sylvite, bittern
Select on the saturated line of epsomite and carnallite, then it is sodium chloride, epsomite and carnallite that one-level carnallite salt pan, which separates out mineral,
Mixed salt；The mixed salt mineral abbreviation one-level carnallite that one-level carnallite salt pan obtains；
Carnallite separates out mass fraction, refers to that this grade of salt pan separates out carnallite quality and account for one-level carnallitite during bittern evaporation
The mass percent for the carnallite total amount that field, two level carnallitite Tanaka are separated out；
（4）The bittern for importing two level carnallitite field is continued to evaporate, carnallite continues to separate out, after bittern reaches old halogen point,
Bittern is imported into old halogen field；Two level carnallitite field separates out the mixed salt that mineral are sodium chloride, epsomite and carnallite, secondary light
The mineral abbreviation two level carnallite that halogen halite field obtains；
（5）By step（3）After gained one-level carnallite is broken, add water or brackish water decomposition, dehalogenation, that is, obtain potassium magnesium and mix
Salt, it is mainly formed as sodium chloride, epsomite and potassium chloride.
2. technique is tedded in the salt pan of the low potassium sulfate type bittern of high magnesium according to claim 1, it is characterised in that step
（1）In, the low potassium sulfate type bittern of the high magnesium, refer to mainly contain K+、Na+、Mg2+、Cl-、SO4 2-The salt lake bittern of ion or
Person's subsurface brine, other impurities mass of ion fraction summation are no more than the 0.5% of raw brine quality.
3. technique is tedded in the salt pan of the low potassium sulfate type bittern of high magnesium according to claim 1 or 2, it is characterised in that step
Suddenly（1）In, the low potassium sulfate type bittern of the high magnesium, is the bittern with following property：That is the bittern in evaporation process, when
When reaching potassium ion saturation precipitation sylvite, its bittern composition point is located at Na+、K+、Mg2+//Cl-、SO4 2-—H2O quinary systems
On epsomite and carnallite saturated line in phasor；Or the three-phase total saturation point positioned at epsomite, potassium chloride and carnallite；Or
On epsomite and potassium chloride saturated line close to epsomite, one section of potassium chloride and carnallite three-phase total saturation point, the segment length
For less than the 50% of epsomite and potassium chloride saturated line total length.
4. technique is tedded in the salt pan of the low potassium sulfate type bittern of high magnesium according to claim 3, it is characterised in that high magnesium is low
Potassium sulfate type bittern, it is the bittern with following property：That is the bittern separates out in evaporation process when reaching potassium ion saturation
During sylvite, its bittern composition point is located at Na+、K+、Mg2+//Cl-、SO4 2-—H2Epsomite and chlorination in O quinary system phasors
Close to one section of epsomite, potassium chloride and carnallite three-phase total saturation point on potassium saturated line, the segment length is epsomite and potassium chloride
Less than the 30% of saturated line total length.
5. technique is tedded in the salt pan of the low potassium sulfate type bittern of high magnesium according to claim 1 or 2, it is characterised in that institute
State brine systems and belong to Na+、K+、Mg2+//Cl-、SO4 2-—H2O quinary systems, the phasor of the system with Ye Nieke indexes come
Show that bittern forms point；At 25 DEG C, the low potassium sulfate type bittern of the high magnesium refers to：When the bittern evaporation to component containing potassium separates out
When, meet potassium ion Ye Nieke indexes 0.1<J2k<8.0, magnesium ion Ye Nieke index 91.2>JMg>76.5。
6. technique is tedded in the salt pan of the low potassium sulfate type bittern of high magnesium according to claim 1 or 2, it is characterised in that institute
State brine systems and belong to Na+、K+、Mg2+//Cl-、SO4 2-—H2O quinary systems, the phasor of the system with Ye Nieke indexes come
Show that bittern forms point；At 15 DEG C, the low potassium sulfate type bittern of the high magnesium refers to：When the bittern evaporation to component containing potassium separates out
When, potassium ion Ye Nieke indexes 0.2 should be met<J2k<7.7, magnesium ion Ye Nieke index 91.9>JMg>78.6。
7. technique is tedded in the salt pan of the low potassium sulfate type bittern of high magnesium according to claim 1, it is characterised in that step
（1）Described in bittern, refer to potassium concentration in 0.1wt%~1.5wt%, magnesium ion concentration is in 0.5wt%~8.0wt%, and magnesium
Ion concentration and potassium concentration ratio are 2~60 ︰ 1, while magnesium ion concentration and sulfate ion concentration are 0.25~2.8 ︰'s 1
Bittern.
8. technique is tedded in the salt pan of the low potassium sulfate type bittern of high magnesium according to claim 7, it is characterised in that step
（1）Described in bittern, refer to potassium concentration in 0.2wt%~1.5wt%, magnesium ion concentration in 2.0wt%~7.0wt%, and magnesium from
Sub- concentration and potassium concentration ratio are 4.5~40 ︰ 1, while magnesium ion concentration and sulfate ion concentration are 0.30~2.1 ︰'s 1
Bittern.
9. technique is tedded in the salt pan of the low potassium sulfate type bittern of high magnesium according to claim 1, it is characterised in that step
（5）In, the addition of the brackish water or water, it is the 25%~40% of one-level carnallite quality.
10. technique is tedded in the salt pan of the low potassium sulfate type bittern of high magnesium according to claim 1 or 9, it is characterised in that step
Suddenly（5）In, the brackish water is salt content≤5wt% water.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113412926A (en) * | 2021-08-03 | 2021-09-21 | 地矿集团格尔木盐湖资源开发有限公司 | Nutritional green edible salt extracted from salt lake mining area and extraction method thereof |
| CN114059989A (en) * | 2021-11-09 | 2022-02-18 | 青海省柴达木综合地质矿产勘查院 | Dissolving mining method of low-grade solid sylvite ore |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113412926A (en) * | 2021-08-03 | 2021-09-21 | 地矿集团格尔木盐湖资源开发有限公司 | Nutritional green edible salt extracted from salt lake mining area and extraction method thereof |
| CN114059989A (en) * | 2021-11-09 | 2022-02-18 | 青海省柴达木综合地质矿产勘查院 | Dissolving mining method of low-grade solid sylvite ore |
| CN114059989B (en) * | 2021-11-09 | 2024-04-26 | 青海省柴达木综合地质矿产勘查院 | Solution mining method of low-grade solid potassium salt ore |
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