CN106430248B - The method that potassium chloride is prepared using potassium mixed salt - Google Patents

The method that potassium chloride is prepared using potassium mixed salt Download PDF

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CN106430248B
CN106430248B CN201610996730.0A CN201610996730A CN106430248B CN 106430248 B CN106430248 B CN 106430248B CN 201610996730 A CN201610996730 A CN 201610996730A CN 106430248 B CN106430248 B CN 106430248B
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nanofiltration membrane
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CN106430248A (en
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时历杰
王敏
杨红军
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Qinghai Institute of Salt Lakes Research of CAS
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Qinghai Institute of Salt Lakes Research of CAS
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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
    • C01D3/08—Preparation by working up natural or industrial salt mixtures or siliceous minerals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/027—Nanofiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/58—Multistep processes
    • 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
    • C01D3/14—Purification
    • 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

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  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nanotechnology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention discloses a kind of method that potassium chloride is prepared using potassium mixed salt, including step：Sodium chloride in the potassium mixed salt is removed using reverse floatation process, obtains mine tailing；Mine tailing is dissolved to simultaneously separation of solid and liquid in water, obtains mine tailing solution；One section of nano-filtration step：One section of nanofiltration processing is carried out to mine tailing solution using nanofiltration membrane system, obtains one section of concentrated water and one section of production water；Wherein, nanofiltration membrane system includes the first nanofiltration membrane component and the first concentrated water case being connected on the first nanofiltration membrane component and the first water producing tank；One section of concentrated water is stored in the first concentrated water case, and one section of production water is stored in the first water producing tank；Crystallization is evaporated to one section of production water, obtains potassium chloride.The invention provides a kind of the new method of potassium chloride is produced using potassium mixed salt as raw material, and this method has the advantages of technique is simple, product purity is high, high income.

Description

The method that potassium chloride is prepared using potassium mixed salt
Technical field
The invention belongs to inorganic salts preparing technical field, specifically, it is related to and a kind of prepares potassium chloride using potassium mixed salt Method.
Background technology
Potassium is one of three big nutrients (nitrogen, phosphorus, potassium) necessary to crop growth, and wherein potassium chloride is as main Potash fertilizer kind, account for more than the 90% of potash fertilizer total amount.China is a serious soil potassium deficiency country, with crop yield and The continuous improvement of Nitrogen and phosphate application rate, the potassium amount that crop removes from soil gradually increases, and with organic fertilizer, straw-returning and applies Crop can not be supplied with the potassium amount for giving back soil containing forms such as potassium fertilizers to exhaust increasingly from the amount of removing in soil, soil potassium element Seriously, potassium deficiency area gradually expands, turn into limitation agricultural production continue, one of the major reason of stable development；Therefore, greatly Power develops China's potassium resource, produces potassium chloride, improves grain yield, significant to maintaining social stability.
At present, the technology of potassium chloride is produced using carnallite or sylvite as raw material, according to carnallite and sylvite Composition it is different, and use various processes preparing potassium chloride.
Potassium mixed salt, which is sulfate type bittern, to be shone the salt mine that the stage separates out on salt pan beach and is referred to as, and is the mixed of a variety of mono-salts and double salt Compound, key component have：Halite (NaCl), epsomite (MgSO4Hydrated salt), sylvite (KCl), kainite (KCl MgSO4·3H2O), picromerite (K2SO4·MgSO4·6H2O), carnallite (KClMgCl2·6H2) and bischofite O (MgCl2·6H2O) etc.；It is 20%~30%NaCl, 15%~25%KCl, 20%~30%MgSO that it, which forms content,4, 5%~ 10%MgCl2, it is mass percent above.
Still it is raw material using potassium mixed salt, potassium therein is converted into chlorine containing a large amount of available resources in potassium mixed salt Change potassium, on the one hand supplement the deficiency of potash fertilizer, on the other hand reduce the waste of resource.
At present, using potassium mixed salt as raw material come prepare the technique of potassium chloride mainly have it is following two：(1) direct flotation method, profit By the use of octadecylamine as floating agent, flotation obtains potassium chloride concentrate；(2) acquisition potassium chloride, this method master are converted with reference to old halogen To be based on formula (1)-(3)：
KCl+MgCl2+6H2O→KCl·MgCl2·6H2O (1)
KCl·MgSO4·3H2O+MgCl2+(x+3)H2O→KCl·MgCl2·6H2O+MgSO4·xH2O (2)
K2SO4·MgSO4·6H2O+3MgCl2+(2x+6)H2O→2KCl·MgCl2·6H2O+2MgSO4·xH2O (3)
According to Phase Diagram for Aqueous Salt Solutions cross reaction principle, old halogen is approximately high concentration saturation magnesium chloride solution, utilizes chlorination Magnesium solubility is far above other salt and solubility is increased substantially so that magnesium chloride is in unsaturated shape in old halogen under the high temperature conditions The characteristic of state, the potassium-bearing mineral in potassium mixed salt and (more than 100 DEG C) generations under magnesium chloride in old halogen by a certain percentage hot conditions Above-mentioned serial reaction, obtain mother liquor and solid sodium chloride, magnesium sulfate monohydrate.After separation of solid and liquid, mother liquor is cooled to normal temperature, crystallized Obtain carnallite and old halogen mother liquor, carnallite, which decomposes, can obtain potassium chloride, and old halogen mother liquor is back to system, again with potassium mixed salt React, utilized.
But above two existing scheme has the disadvantage that：(1) when using direct flotation method, potassium mixed salt is in flotation Cheng Zhong, in addition to the potassium chloride, other potassium-bearing minerals such as kainite still enter concentrate foam with the existence form of kainite, it is impossible to The separation of potassium chloride and magnesium sulfate is realized, and picromerite is remained in mine tailing, so as to reduce the flotation yield of octadecylamine； (2) old halogen conversion can realize that potassium mixed salt prepares Potassium Chloride Product, but due to that must implement under the high temperature conditions, condition is harsh, energy Consumption is high, and operational danger is high, and must control potassium ores and old halogen additional proportion, ratio not at that time, sodium chloride and magnesium sulfate Impurity is easily mixed into crystallization carnallite because content is high, influences potassium chloride grade；Although under normal temperature condition old halogen can also and potassium Conversion reaction occurs for mixed salt ore deposit, but transformation efficiency is very low, and infeasible.
The content of the invention
To solve the above-mentioned problems of the prior art, the invention discloses a kind of side that potassium chloride is prepared using potassium mixed salt Method, there is provided it is a kind of to produce the new method of potassium chloride using potassium mixed salt as raw material, and this method has that technique is simple, product is pure The advantages of degree is high, high income.
In order to reach foregoing invention purpose, present invention employs following technical scheme：
A kind of method that potassium chloride is prepared using potassium mixed salt, including step：The potassium mixed salt is removed using reverse floatation process In sodium chloride, obtain mine tailing；The mine tailing is dissolved to simultaneously separation of solid and liquid in water, obtains mine tailing solution；One section of nano-filtration step： One section of nanofiltration processing is carried out to the mine tailing solution using nanofiltration membrane system, obtains one section of concentrated water and one section of production water；Wherein, it is described Nanofiltration membrane system includes the first nanofiltration membrane component and the first concentrated water case being connected on first nanofiltration membrane component and first Water producing tank；One section of concentrated water is stored in the first concentrated water case, and one section of production water is stored in first water producing tank； Crystallization is evaporated to described one section production water, obtains the potassium chloride.
Further, the nanofiltration membrane system also includes being arranged on the first booster pump before first nanofiltration membrane component.
Further, the pressure of first booster pump is 0.6MPa~1.5MPa.
Further, the nanofiltration membrane system also include being connected to the second nanofiltration membrane component on the first concentrated water case, And it is connected to the second concentrated water case and the second water producing tank on second nanofiltration membrane component；One section of nano-filtration step it Afterwards, methods described also includes two sections of nano-filtration steps：Two sections are carried out using second nanofiltration membrane component to first concentrated water to receive Filter is handled, and obtains two sections of concentrated waters and two sections of production water；Two sections of concentrated waters are stored in the second concentrated water case, two sections of productions water It is stored in second water producing tank.
Further, the nanofiltration membrane component also includes being arranged on the first concentrated water case and second nanofiltration membrane component Between the second booster pump.
Further, the pressure of second booster pump is 1.2MPa~2.5MPa.
Further, two sections of productions water is incorporated in one section of production water.
Further, two sections of concentrated waters are incorporated in the mine tailing solution.
Further, after two sections of nano-filtration steps, methods described also includes：Two sections of concentrated waters are evaporated Simultaneously separation of solid and liquid is crystallized, obtains the sulfate and evaporation mother liquor of magnesium；Wherein, the evaporation mother liquor is incorporated in the mine tailing solution.
Further, the nanofiltration membrane system is concentrated water internal-circulation type membranous system.
Beneficial effects of the present invention：
(1) method that potassium chloride is prepared using potassium mixed salt of the invention is orderly by reverse flotation technology and Nanofiltration Membrane Separation Technology It is coupled, wherein reverse flotation technology preferentially removes in potassium mixed salt 90%~95% sodium chloride, and sodium chloride is greatly lowered Separating and the influence in product preparation process；Nanofiltration separation technology uses the nanofiltration membrane system of concentrated water part outer circulation, realizes Separation between the monovalent ion such as the high valence ions such as magnesium, sulfate radical in potassium mixed salt and potassium, sodium, ensure the receipts of the potassium in production water Rate, and the potassium in production water is finally separated out in the form of potassium chloride, it is achieved thereby that potassium mixed salt prepares the purpose of Potassium Chloride Product；
(2) the method according to the invention removes substantial amounts of sodium chloride in potassium mixed salt using reverse floatation process, is greatly lowered Influence of the sodium chloride to later separation efficiency and product；
(3) consumption that the fresh water of mine tailing is dissolved in the method according to the invention is dense with the setting of all kinds of salt in mine tailing solution Degree is defined, and prevents the excessive consumption of fresh water；By dissolving mine tailing eliminate gypsum impurity a small amount of in potassium mixed salt simultaneously, avoid into Enter in mine tailing solution and influence the efficiency of separation and nanofiltration processing；
(4) present invention preferably employs two sections of nanofiltration membrane components to be separated, and can further separate magnesium, the sulphur in one section of concentrated water The monovalent ion such as the high valence ions such as acid group and potassium, sodium, one improves the separation yield of potassium chloride, ensures the potassium in production water with potassium chloride Form separates out；
(5) the single hop nanofiltration membrane component in nanofiltration membrane system of the present invention loads return valve, realize each section it is dense Circulated in water, maintain the stabilization of water inlet flow velocity in nanofiltration membrane component, while not with leading portion nanofiltration membrane component pollution level or water inlet The change of composition and change；
(6) nanofiltration membrane system of the present invention is concentrated water part outer circulation membranous system, and two sections of part concentrated water is back to In mine tailing solution, increase the relative scale of magnesium salts in mine tailing solution, so as to further improve high valence ion and the potassium such as magnesium, sulfate radical Deng the nanofiltration separation efficiency of monovalent ion；In combination with the composition of evaporation mother liquor, the internal circulating load of two sections of concentrated waters is adjusted, meets mine tailing The concentration requirement of solution；And two sections of concentrated waters being introduced into mine tailing solution can be used for the sulphur for preparing the magnesium such as magnesium sulfate, picromerite Hydrochlorate product, so as to realize the comprehensive utilization of two sections of concentrated waters；
(7) in evaporation and crystal process, theoretical direction and calculating are carried out using Phase Diagram for Aqueous Salt Solutions, is ensured in crystalline solid phase The high-purity of product, beneficial to the quality standard of control product.
Brief description of the drawings
The following description carried out in conjunction with the accompanying drawings, above and other aspect, feature and the advantage of embodiments of the invention It will become clearer, in accompanying drawing：
Fig. 1 is the process chart of the method according to an embodiment of the invention that potassium chloride is prepared using potassium mixed salt；
Fig. 2 is the step flow chart of the method according to an embodiment of the invention that potassium chloride is prepared using potassium mixed salt.
Embodiment
Hereinafter, with reference to the accompanying drawings to embodiments of the invention are described in detail.However, it is possible to come in many different forms real Apply the present invention, and the specific embodiment of the invention that should not be construed as limited to illustrate here.Conversely, there is provided these implementations Example is in order to explain the principle and its practical application of the present invention, so that others skilled in the art are it will be appreciated that the present invention Various embodiments and be suitable for the various modifications of specific intended application.In the accompanying drawings, for the sake of clarity, element can be exaggerated Shape and size, and identical label will be used to indicate same or analogous element all the time.
It will be appreciated that although can be used term " first ", " second " etc. to describe various elements herein, but these Element should not be limited by these terms.These terms are only used for making a distinction an element with another element.
Present embodiment discloses a kind of method that potassium chloride is prepared using potassium mixed salt, referring in particular to Fig. 1 and Fig. 2, according to this The method that potassium chloride is prepared using potassium mixed salt of embodiment is comprised the following steps：
S1, the sodium chloride in potassium mixed salt, acquisition mine tailing are removed using reverse floatation process.
Specifically, in flotation cell 1, using sodium chloride floating agent flotation potassium mixed salt, using sodium chloride, soft potassium magnesium The common saturated solution of alum, sylvite and carnallite scrapes as flotation medium, sodium chloride with flotation froth, remaining sodium chloride content The mine tailing being greatly reduced.
The wherein preferred alkyls morpholine of sodium chloride floating agent.
In the present embodiment, the removal efficiency of sodium chloride reaches 90%~95% in potassium mixed salt, sodium chloride in the mine tailing of acquisition Mass percent be only 2%~4%.
S2, mine tailing is dissolved to simultaneously separation of solid and liquid in water, obtain mine tailing solution.
Obtained after reverse flotation in mine tailing based on potassium-bearing mineral, also containing a small amount of sodium chloride and micro gypsum；By mine tailing Water is dissolved in dissolving tank 2, and is separated through separation of solid and liquid, gypsum with mine tailing solution.
S3, one section of nano-filtration step：One section is carried out to mine tailing solution using the first nanofiltration membrane component 31 in nanofiltration membrane system Nanofiltration is handled, and obtains one section of concentrated water and one section of production water.
Specifically, nanofiltration membrane system includes the first nanofiltration membrane component 31 and is connected on the first nanofiltration membrane component 31 The first concentrated water case (not shown) and the first water producing tank (not shown)；First concentrated water case is used to store one section of concentrated water, And the first water producing tank is used to store one section of production water.
Because still suffering from substantial amounts of potassium chloride in one section of concentrated water, in order to further improve the yield of potassium chloride, by one section of concentrated water Separated again by nanofiltration membrane component, therefore, also included after step S3：
S4, two sections of nano-filtration steps：Two sections are carried out to the first concentrated water using the second nanofiltration membrane component 32 in nanofiltration membrane system Nanofiltration is handled, and obtains two sections of concentrated waters and two sections of production water.
Specifically, the second nanofiltration membrane component 32 is connected on the first concentrated water case, and the second concentrated water case (not shown) It is both connected to the second water producing tank (not shown) on the second nanofiltration membrane component 2；Second concentrated water case is used to store two sections of concentrated waters, Second water producing tank is used to store two sections of production water.
Preferably, the nanofiltration membrane system also include being arranged on the first booster pump 33 before the first nanofiltration membrane component 31 and The second booster pump 34 being arranged between the first concentrated water case and the second nanofiltration membrane component 32.
In the present embodiment, the pressure for controlling the first booster pump 33 is 0.6MPa~1.5MPa, controls the second booster pump 34 Pressure be 1.2MPa~2.5MPa.
Preferably, nanofiltration membrane system is concentrated water internal-circulation type membranous system used by the present embodiment；That is, in nanofiltration Load return valve (not shown) in membranous system, part concentrated water can be returned directly to the import of nanofiltration membrane component by return valve And merge with water inlet (i.e. mine tailing solution, one section of concentrated water), it is again introduced into corresponding nanofiltration membrane component and is separated.Followed in concentrated water Ring can make the water inlet flow rate kept constant in nanofiltration membrane component, and pressure of the nanofiltration membrane component import between exporting keeps one Cause, so that the desalination rate of nanofiltration membrane component is improved, which greatly enhances separative efficiency and the system rate of recovery, reduces and receive The series of filter.
NF membrane in the above-mentioned nanofiltration membrane component 32 of first nanofiltration membrane component 31 and second can be selected any ripe production, The rolling nanofiltration membrane component of application, such as NF90, NF270 series NF membrane of DOW companies, DK, DL of GE companies, CK, The serial NF membrane such as Duraslick, HL, MUNi NF.DK, DL series NF membrane of the preferred GE companies of the present embodiment.
S5, crystallization is evaporated to one section of production water, obtains potassium chloride.
Preferably, two sections of production water are incorporated in one section of production water, crystallization is evaporated jointly with one section of production water.
Usually, after the mixing production water of one section of production water and two sections of production water being evaporated into crystallization, the first compound can be produced Slurry, the first mixed slurry obtain rich potassium evaporation mother liquor and wet potassium chloride through separation of solid and liquid；Wherein, in rich potassium evaporation mother liquor, K+'s Concentration is 65g/L~73g/L, Na+Concentration be 45g/L~50g/L, Mg2+Concentration be 10g/L~15g/L, SO4 2-Concentration For 35g/L~40g/L.
Wet potassium chloride refines through water washing, that is, obtains potassium chloride.
Because the content for mixing NaCl in production water is relatively low, therefore the solid phase separated out through evaporative crystallization is the very high KCl of purity, Scrubbed refine can obtain target product potassium chloride, K again+Total eduction rate be 80%~85%.
Preferably, caused water and rich potassium evaporation mother liquor are incorporated to mine tailing solution in production water evaporation crystallization process is mixed In；And refine rich potassium washing mother liquor caused by wet potassium chloride in washing and may be incorporated into mine tailing solution, or be incorporated to one section of production water and In the mixing production water of two sections of production water, crystallization is evaporated in the lump.
Two sections of S6, processing concentrated waters.
Specifically, two sections of part concentrated water is incorporated in mine tailing solution, remaining two sections of concentrated water is evaporated and crystallizes and consolidates Liquid separates, and obtains the sulfate and rich magnesium evaporation mother liquor of magnesium.
Specifically, two sections of concentrated waters obtain the second mixed slurry through evaporative crystallization, and the second mixed slurry obtains through separation of solid and liquid The sulfate of magnesium and rich magnesium evaporation mother liquor；The sulfate of the magnesium obtained herein includes magnesium sulfate, picromerite etc.；Simultaneously by richness Magnesium evaporation mother liquor is incorporated in mine tailing solution.
Preferably, caused water is incorporated in mine tailing solution in two sections of concentrated water evaporation and crystal processes, to be used as the molten of mine tailing Agent, reduce fresh water usage amount.
The high price ion concentration such as magnesium, sulfate radical is higher in two sections of concentrated waters, using part concentrated water outer circulation, returns it to tail In mineral solution, the relative scale of magnesium salts in mine tailing solution can be increased, so as to further improve magnesium, sulphur in one section of nano-filtration step The nanofiltration separation efficiency of the monovalent ion such as the high valence ions such as acid group and potassium, sodium.
What deserves to be explained is in above-mentioned steps S5 and S6, the conventional evaporation mode of twice evaporation crystallization is solar energy salt Pond, forced evaporation or counter-infiltration combination forced evaporation etc.；Wherein the mode in solar energy salt pond can make full use of abundant solar energy Resource, but recycle-water resource capability is limited；Forced evaporation, the mode of counter-infiltration combination forced evaporation can realize substantial amounts of fresh water Recycle, but certain energy consumption need to be consumed.Because total dissolved solid (abbreviation TDS) is relative in one section of production water and two sections of production water It is higher, therefore when from the mode of counter-infiltration combination forced evaporation, the preferred seawater reverse osmosis membrane of reverse-osmosis membrane element therein Element, to improve the rate of recovery of fresh water.
The concentration and separating effect of the liquid in each stage in the present embodiment are listed below by way of table 1, to illustrate according to this hair The beneficial effect of the bright method that potassium chloride is prepared using potassium mixed salt.
The liquid composition and separating effect in 1 each stage of table
The composition of mine tailing solution in the step S2 of table 2
Each liquid composition in the step S3 of table 3
Each liquid composition in the step S4 of table 4
The composition of production water is mixed in the step S5 of table 5
With reference to table 3 and table 4, from table 1 it follows that mine tailing solution passes through continuous two sections of nanofiltration separations, KCl's is total It is 80%~85%, MgSO to cross total transmitance that rate is 87%~94%, NaCl4Total rejection be 96%~99.9%, MgCl2Total rejection be 94%~99%；In this way, the high valence ion such as the monovalent ion such as potassium, sodium and magnesium, sulfate radical in potassium mixed salt Obtain excellent separating effect.
It can be seen from Table 5 that in one section is produced the mixing production water of water and two sections of production hydrations simultaneously, KCl accounts for total salinity 85%~90%, thus Potassium Chloride Product can be then obtained first by evaporative crystallization.
According to the method innovation that potassium chloride is prepared using potassium mixed salt of the present embodiment using reverse flotation-nanofiltration coupling skill Art, on the premise of any other salt raw material is not added, realize that potassium mixed salt produces high-quality Potassium Chloride Product, there is technological operation The advantages that mild condition, separating effect are excellent, other components influences are small, product purity is high, high income；Meanwhile technological process letter Single, reasonable, equipment is easy to configure, clean, install and shift, easily popularization and application.
Although the present invention has shown and described with reference to specific embodiment, it should be appreciated by those skilled in the art that： In the case where not departing from the spirit and scope of the present invention limited by claim and its equivalent, can carry out herein form and Various change in details.

Claims (7)

  1. A kind of 1. method that potassium chloride is prepared using potassium mixed salt, it is characterised in that including step：
    Sodium chloride in the potassium mixed salt is removed using reverse floatation process, obtains mine tailing；
    The mine tailing is dissolved to simultaneously separation of solid and liquid in water, obtains mine tailing solution；
    One section of nano-filtration step：One section of nanofiltration processing is carried out to the mine tailing solution using nanofiltration membrane system, obtain one section of concentrated water and One section of production water；Wherein, the nanofiltration membrane system includes the first nanofiltration membrane component and is connected on first nanofiltration membrane component The first concentrated water case and the first water producing tank；One section of concentrated water is stored in the first concentrated water case, one section of production water storage In first water producing tank；
    Two sections of nano-filtration steps：The nanofiltration membrane system also include being connected to the second nanofiltration membrane component on the first concentrated water case, And it is connected to the second concentrated water case and the second water producing tank on second nanofiltration membrane component；Using second nanofiltration membrane component Two sections of nanofiltration processing are carried out to first concentrated water, obtain two sections of concentrated waters and two sections of production water；Two sections of productions water is stored in described In second water producing tank, two sections of concentrated waters are stored in the second concentrated water case, to be incorporated in the mine tailing solution；
    To carrying out evaporative crystallization after described one section production water and two sections of productions hydration simultaneously, the potassium chloride is obtained.
  2. 2. according to the method for claim 1, it is characterised in that the nanofiltration membrane system is also received including being arranged on described first The first booster pump before filter membrane component.
  3. 3. according to the method for claim 2, it is characterised in that the pressure of first booster pump be 0.6MPa~ 1.5MPa。
  4. 4. according to the method for claim 1, it is characterised in that the nanofiltration membrane component is also dense including being arranged on described first The second booster pump between water tank and second nanofiltration membrane component.
  5. 5. according to the method for claim 4, it is characterised in that the pressure of second booster pump be 1.2MPa~ 2.5MPa。
  6. 6. according to the method for claim 1, it is characterised in that after two sections of nano-filtration steps, methods described is also wrapped Include：Crystallization and separation of solid and liquid are evaporated to two sections of concentrated waters, obtains the sulfate and evaporation mother liquor of magnesium；Wherein, the steaming Hair mother liquor is incorporated in the mine tailing solution.
  7. 7. according to the method for claim 1, it is characterised in that the nanofiltration membrane system is concentrated water internal-circulation type membranous system.
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