CN106006678A - Multi-level salt pan evaporation method for raising yield of potassium in low-grade brine - Google Patents

Multi-level salt pan evaporation method for raising yield of potassium in low-grade brine Download PDF

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CN106006678A
CN106006678A CN201610323387.3A CN201610323387A CN106006678A CN 106006678 A CN106006678 A CN 106006678A CN 201610323387 A CN201610323387 A CN 201610323387A CN 106006678 A CN106006678 A CN 106006678A
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salt
potassium
solid
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salt pan
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CN106006678B (en
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马艳芳
张志宏
李玉龙
杨广林
胡天琦
王健康
张永明
赵冬梅
付振海
王婧
董生发
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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
    • C01D3/06—Preparation by working up brines; seawater or spent lyes

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Abstract

The invention discloses a multi-level salt pan evaporation method for raising the yield of potassium in low-grade brine. The method includes the following steps that 1, salt lake brine of any type is taken, the hydrochemical type of the brine is determined through analysis of the chemical composition of the brine, based on the hydrochemical type of the brine, and through a corresponding phase diagram, solid sodium chloride precipitation amount A and K<+>max obtained when the brine is evaporated till potassium ions are saturated are calculated; 2, the salt pan level number n and the common ratio q are calculated according to a formula; 3, the content of potassium ions K<+>n in each level of the brine is calculated according to the salt pan level number n and the common ratio q; 4, the solid sodium chloride precipitation amount an of each level of salt pan is calculate according to the salt pan level number n and the common ratio q; 5, the evaporation processes of all levels of salt pans are monitored according to step 3 and step 4, when the content of potassium ions or the solid sodium chloride precipitation amount in a certain level of slat pan reaches the set value, solid-liquid separation is conducted on the certain level of salt pan, motor liquor enters a next level of salt pan to be continuously evaporated till the n-level salt pan is evaporated and solid-liquid separation is completed, and finally the yield of potassium ions in the mother liquor is higher than or equal to 83.0%.

Description

A kind of multistage salt pan method of evaporating improving potassium yield in low grade brine
Technical field
The invention belongs to salt lake bittern and utilize technical field, improve low grade brine in particular it relates to a kind of The multistage salt pan method of evaporating of middle potassium yield.
Background technology
In the salt lake of Qinghai-Tibet Platean, low grade brine accounts for the 1/3 of salt lake sum, and low-grade salt lake bittern steams in salt pan During Faing, potassium yield is low, especially in sodium chloride salt pond, and the potassium resource due to mother solution entrainment loss, cause potassium yield Low.Valuable salt lake resources is not used adequately reasonably.
In prior art, the evaporation salt field process for low-grade salt lake bittern is to use step evaporation to satisfy to potassium ion With, then solid-liquid isolation method, there are some defects, such as, carry secretly many due to the mother solution in solid, salt in this method Field operation is complicated, solid-liquid separation needs energy consumption and loss are relatively big, clear up after solid-liquid separation salt pond and again lead halogen need to The time wanted is longer, and mother solution entrainment loss is bigger.In existing low grade brine, salt field process potassium yield is low, time-consumingly Long；Only one of which sodium salt pond in existing salt field process, the potassium resource of mother solution entrainment loss is relatively big, causes potassium and receives Rate is low.
Summary of the invention
It is an object of the invention to, it is provided that a kind of multistage salt pan method of evaporating improving potassium yield in low grade brine, The method is for low grade brine, by multistage salt pan essence prosecutor method, makes potassium ion yield improve to >=80.0%, fall Low cost, shortens the time, and salt lake resources has obtained Appropriate application.
For reaching above-mentioned purpose, present invention employs following technical scheme:
1) take any type of salt lake bittern, determined the hydrochemical type of this salt by the chemical composition analyzing salt, Again according to the hydrochemical type of this salt, and by this bittern evaporation of corresponding PHASE DIAGRAM CALCULATION to potassium ion saturated time solid Body sodium chloride separate out amount A and
2) salt pan progression n and common ratio q is calculated according to the following equation；
N=K+ max/KJust +, K+ JustFor K in salt+Initial concentration, n takes positive integer；
Q=2.44-0.124n；
3) potassium content K in every one-level salt is calculated according to salt pan progression n and common ratio q+ n；
K1 +%=K+ max/(qn-1+qn-2+……+q2+q+1)；
K2 +%=K+ max/(qn-2+qn-3+……+q2+q+1)；
K3 +%=K+ max/(qn-3+qn-4+……+q2+q+1)；
……；
Kn-1 +%=K+ max/(q+1)；
Kn +%=K+ max；
4) calculate, according to salt pan progression n and common ratio q, amount a that every one-level salt pan solid sodium chloride separates outn；
Bn=A/ (qn+qn-1+……+q2+q+1)；
Bn-1=A/ (qn-1+qn-2+……+q2+q+1)；
……；
B2=A/ (q2+q+1)；
B1=A/ (q+1)；
B=Bn+Bn-1+…+B1；
Cn=Bn/B；
……；
C1=B1/B；
an=A × Cn；
……；
a1=A × C1；
5) according to step 3), 4) the amount monitoring that separates out of the potassium content in salt pans at different levels that sets and solid sodium chloride The evaporation process in salt pans at different levels, when in certain one-level salt pan of n level salt Tanaka, potassium content or solid sodium chloride separate out Amount when reaching setting value, this grade of salt pan is carried out solid-liquid separation, the mother solution of isolated enters next stage salt pan and continues Continuous evaporation, until solid-liquid separation has been evaporated in n-th grade of salt pan, yield >=80.0% of potassium ion in final mother solution.
Preferably, described salt lake bittern is balun horse sea, Qinghai sulfate type salt lake brine, and salt consists of: K+: 0.07-0.3%, Mg2+: 0.5-1.5%, Na+: 7.4-9.8%, Cl-: 12.1-17.2%, SO4 2-: 1.0-2.2%.
Preferably, described n is the positive integer more than 1.
Preferably, during every one-level salt pan solid-liquid separation, in solid, entrainment mother liquor amount accounts for the 15-25% of solid gross mass.
The inventive method is simple, quick, and the production cycle is shorter, and process is easy, solves potassium in low grade brine and receives The problem that rate is low.The potassium in low grade brine can be made after being evaporated by multi-level oil control salt pan to receive improve to >=83.0%.
The present invention is directed to low grade brine, it is adaptable to the low product salt of all hydrochemical types.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further detailed explanation.
Embodiment 1
A kind of salt field process method improving potassium yield in low grade brine, comprises the following steps:
(1) taking balun horse sea, Qinghai sulfate type salt lake brine, analytical chemistry forms, salt consist of K+、Mg2+、 Na+、Cl-、SO4 2-It is main solution, wherein K+(i.e. K0 +) mass content is 0.25%, Mg2+Mass content It is 1.5%, Na+Mass content is 9.8%, Cl-Mass content is 17.2%, SO4 2-Mass content is 2.2%；
(2) by five yuan of phasor K+,Mg2+,Na+,Cl-,SO4 2-//H2O calculates, and this salt separated out in the sodium chloride stage Total amount 20kg, K in liquid phase+Concentration reaches potassium saturated (K when 2.20%+ max)。
(3) taking 100kg salt as raw material, be placed in vaporization chamber, electric fan is interrupted air draft, prepares multiple simultaneously Evaporation tank；
(4) salt pan progression determines: n=K+ max/K0 +=2.20/0.25=8,
(5) NaCl salt pond being designed as 8 grades of salt pans, salt pan numbering is designated as respectively: 1,2,3,4,5,6,7, 8。
Common ratio q separates according to being with every one-level salt pan:
Q=2.48-0.21 × n, (n=4), q=0.80；
K1 +%=K+ max/(qn-1+qn-2+……+q2+q+1)
=2.2/ (0.87+0.86+0.85+0.84+0.83+0.82+ 0.8+1)=0.53；
K2 +%=2.2/ (0.86+0.85+0.84+0.83+0.82+ 0.8+1)=0.56；
K3 +%=2.2/ (0.85+0.84+0.83+0.82+ 0.8+1)=0.60；
K4 +%=2.2/ (0.84+0.83+0.82+ 0.8+1)=0.65；
K5 +%=2.2/ (0.83+0.82+ 0.8+1)=0.75；
K6 +%=2.2/ (0.82+ 0.8+1)=0.90；
K7 +%=2.2/ (0.8+1)=1.22；
K8 +%=2.20；
B8=A/ (qn+qn-1+qn-2+……+q2+q+1)
=20/ (0.88+0.87+0.86+0.85+0.84+0.83+0.82+ 0.8+1)=4.62；
B7=A/ (qn-1+qn-2+……+q2+q+1)
=20/ (0.87+0.86+0.85+0.84+0.83+0.82+ 0.8+1)=4.81；
B6=20/ (0.86+0.85+0.84+0.83+0.82+ 0.8+1)=5.06；
B5=20/ (0.85+0.84+0.83+0.82+ 0.8+1)=5.42；
B4=20/ (0.84+0.83+0.82+ 0.8+1)=5.95；
B3=20/0.83+0.82+ 0.8+1)=6.78；
B2=20/ (0.82+ 0.8+1)=8.20；
B1=20/ (0.8+1)=11.11；
B=B8+B7+B6+B5+B4+B3+B2+B1=51.9；
C8=B8/ B=0.08；
C7To C1It is respectively 0.09,0.10,0.11,0.12,0.13,0.16,0.21；
a8=A*C8…a1=A*C1；
a8To a1It is respectively 1.78,1.85,1.95,2.09,2.29,2.61,3.15,4.28.
K will be consisted of+0.25%, Mg2+1.5%, Na+9.8%, Cl-17.2%, SO4 2-The salt of 2.2% injects Evaporating in 1 grade of salt pond, the potassium content in detection salt reaches 0.50%, and solid-liquid separation, salt imports in 2 grades of salt ponds Evaporation, amount of solid 4.20kg；
Detect in 2 grades of salt ponds potassium content in salt and reach 0.56%, solid-liquid separation, salt imports in 3 grades of salt ponds and evaporates, Amount of solid 3.15kg；
Detect the potassium content in 3 grades of salt pond salt and reach 0.61%, solid-liquid separation, salt imports in 4 grades of salt ponds and evaporates, Amount of solid 2.61kg；
Same operational approach, the potassium content in detection salt reaches or close to after theoretical expectation values, leads the most successively Enter in next stage salt pond and evaporate, potassium content in 4,5,6,7,8 salt pond salt successively reaches 0.68,0.75,0.88, 1.22,2.10%, amount of solid is respectively 2.33,2.09,1.90,1.89,1.78kg.
(6) every one-level mother solution carries 20% secretly.
(7) being calculated as follows of potassium yield:
General potassium amount: K+ Just% × salt total amount=0.25% × 100=25kg
Mother solution entrainment loss in the solid-liquid separation of every one-level salt pond: K during every one-level solid-liquid separation+ n% × every one-level Solid-liquid weight a separatedn× mother solution is carried secretly, such as: 0.50 × 4.20 × 20%=0.42kg.
1, the potassium of 2,3,4,5,6,7,8 salt pond solid-liquid separation losses be respectively as follows: 0.42,0.35,0.32,0.32, 0.31,0.33,0.46,0.71kg, add up to 3.229kg.
Potassium yield: (25-3.229)/25 × 100%=87.1%
Embodiment 2
A kind of salt field process method improving potassium yield in low grade brine, comprises the following steps:
(1) taking balun horse sea, Qinghai sulfate type salt lake brine, analytical chemistry forms, salt consist of K+、Mg2+、 Na+、Cl-、SO4 2-It is main solution, wherein K+Mass content is 0.25%, Mg2+Mass content is 1.5%, Na+Mass content is 9.8%, Cl-Mass content is 17.2%, SO4 2-Mass content is 2.2%；
(2) by five yuan of phasor K+,Mg2+,Na+,Cl-,SO4 2-//H2O calculates, and this salt separated out in the sodium chloride stage Total amount 20kg, K in liquid phase+It is saturated that concentration reaches potassium when 2.20%.
(3) taking 100kg salt as raw material, be placed in vaporization chamber, electric fan is interrupted air draft, prepares multiple simultaneously Evaporation tank；
(4) salt pan progression determines: n=K+ max/K0 +=2.20/0.25=8,
(5) NaCl salt pond being designed as 8 grades of salt pans, salt pan numbering is designated as respectively: 1,2,3,4,5,6,7, 8。
Common ratio q separates according to being with every one-level salt pan:
Q=2.48-0.21 × n, (n=4), q=0.80；
K1 +%=K+ max/(qn-1+qn-2+……+q2+q+1)
=2.2/ (0.87+0.86+0.85+0.84+0.83+0.82+ 0.8+1)=0.53；
K2 +%=2.2/ (0.86+0.85+0.84+0.83+0.82+ 0.8+1)=0.56；
K3 +%=2.2/ (0.85+0.84+0.83+0.82+ 0.8+1)=0.60；
K4 +%=2.2/ (0.84+0.83+0.82+ 0.8+1)=0.65；
K5 +%=2.2/ (0.83+0.82+ 0.8+1)=0.75；
K6 +%=2.2/ (0.82+ 0.8+1)=0.90；
K7 +%=2.2/ (0.8+1)=1.22；
K8 +%=2.20；
B8=A/ (qn+qn-1+qn-2+……+q2+q+1)
=20/ (0.88+0.87+0.86+0.85+0.84+0.83+0.82+ 0.8+1)=4.62；
B7=A/ (qn-1+qn-2+……+q2+q+1)
=20/ (0.87+0.86+0.85+0.84+0.83+0.82+ 0.8+1)=4.81；
B6=20/ (0.86+0.85+0.84+0.83+0.82+ 0.8+1)=5.06；
B5=20/ (0.85+0.84+0.83+0.82+ 0.8+1)=5.42；
B4=20/ (0.84+0.83+0.82+ 0.8+1)=5.95；
B3=20/0.83+0.82+ 0.8+1)=6.78；
B2=20/ (0.82+ 0.8+1)=8.20；
B1=20/ (0.8+1)=11.11；
B=B8+B7+B6+B5+B4+B3+B2+B1=51.9；
C8=B8/ B=0.08；
C7To C1It is respectively 0.09,0.10,0.11,0.12,0.13,0.16,0.21；
a8=A*C8…a1=A*C1；
a8To a1It is respectively 1.78,1.85,1.95,2.09,2.29,2.61,3.15,4.28.
K will be consisted of+0.25%, Mg2+1.5%, Na+9.8%, Cl-17.2%, SO4 2-The salt of 2.2% injects Evaporating in 1 grade of salt pond, the potassium content in detection salt reaches 0.53%, and solid-liquid separation, salt imports in 2 grades of salt ponds Evaporation, amount of solid 4.30kg；
Detect in 2 grades of salt ponds potassium content in salt and reach 0.54%, solid-liquid separation, salt imports in 3 grades of salt ponds and evaporates, Amount of solid 3.10kg；
Detect the potassium content in 3 grades of salt pond salt and reach 0.59%, solid-liquid separation, salt imports in 4 grades of salt ponds and evaporates, Amount of solid 2.64kg；
Same operational approach, the potassium content in detection salt reaches or close to after theoretical expectation values, leads the most successively Enter in next stage salt pond and evaporate, potassium content in 4,5,6,7,8 salt pond salt successively reaches 0.65,0.73,0.94, 1.25,2.20%, amount of solid is respectively 2.29,2.00,1.98,1.80,1.79kg.
(6) every one-level mother solution carries 15% secretly.
(7) being calculated as follows of potassium yield:
General potassium amount: K+ Just% × salt total amount=0.25% × 100=25kg
Mother solution entrainment loss in the solid-liquid separation of every one-level salt pond: K during every one-level solid-liquid separation+ n% × every one-level Solid-liquid weight a separatedn× mother solution is carried secretly, such as: 0.53 × 4.30 × 15%=0.34kg.
1, the potassium of 2,3,4,5,6,7,8 salt pond solid-liquid separation losses be respectively as follows: 0.34,0.25,0.23,0.22, 0.22,0.28,0.34,0.59kg, add up to 2.476kg.
Potassium yield: (25-2.476)/25 × 100%=90.1%
Embodiment 3
A kind of salt field process method improving potassium yield in low grade brine, comprises the following steps:
(1) taking Qinghai balun Ma Hai sulfate type salt lake brine, analytical chemistry forms, salt consist of K+、 Mg2+、Na+、Cl-、SO4 2-It is main solution, wherein K+Mass content is 0.25%, Mg2+Mass content is 1.5%, Na+Mass content is 9.8%, Cl-Mass content is 17.2%, SO4 2-Mass content is 2.2%；
(2) by five yuan of phasor K+,Mg2+,Na+,Cl-,SO4 2-//H2O calculates, and this salt separated out in the sodium chloride stage Total amount 20kg, K in liquid phase+It is saturated that concentration reaches potassium when 2.20%.
(3) taking 100kg salt as raw material, be placed in vaporization chamber, electric fan is interrupted air draft, prepares multiple simultaneously Evaporation tank；
(4) salt pan progression determines: n=K+ max/K0 +=2.20/0.25=8,
(5) NaCl salt pond being designed as 8 grades of salt pans, salt pan numbering is designated as respectively: 1,2,3,4,5,6,7, 8。
Common ratio q separates according to being with every one-level salt pan:
Q=2.48-0.21 × n, (n=4), q=0.80；
K1 +%=K+ max/(qn-1+qn-2+……+q2+q+1)
=2.2/ (0.87+0.86+0.85+0.84+0.83+0.82+ 0.8+1)=0.53；
K2 +%=2.2/ (0.86+0.85+0.84+0.83+0.82+ 0.8+1)=0.56；
K3 +%=2.2/ (0.85+0.84+0.83+0.82+ 0.8+1)=0.60；
K4 +%=2.2/ (0.84+0.83+0.82+ 0.8+1)=0.65；
K5 +%=2.2/ (0.83+0.82+ 0.8+1)=0.75；
K6 +%=2.2/ (0.82+ 0.8+1)=0.90；
K7 +%=2.2/ (0.8+1)=1.22；
K8 +%=2.20；
B8=A/ (qn+qn-1+qn-2+……+q2+q+1)
=20/ (0.88+0.87+0.86+0.85+0.84+0.83+0.82+ 0.8+1)=4.62；
B7=A/ (qn-1+qn-2+……+q2+q+1)
=20/ (0.87+0.86+0.85+0.84+0.83+0.82+ 0.8+1)=4.81；
B6=20/ (0.86+0.85+0.84+0.83+0.82+ 0.8+1)=5.06；
B5=20/ (0.85+0.84+0.83+0.82+ 0.8+1)=5.42；
B4=20/ (0.84+0.83+0.82+ 0.8+1)=5.95；
B3=20/0.83+0.82+ 0.8+1)=6.78；
B2=20/ (0.82+ 0.8+1)=8.20；
B1=20/ (0.8+1)=11.11；
B=B8+B7+B6+B5+B4+B3+B2+B1=51.9；
C8=B8/ B=0.08；
C7To C1It is respectively 0.09,0.10,0.11,0.12,0.13,0.16,0.21；
a8=A*C8…a1=A*C1；
a8To a1It is respectively 1.78,1.85,1.95,2.09,2.29,2.61,3.15,4.28.
K will be consisted of+0.25%, Mg2+1.5%, Na+9.8%, Cl-17.2%, SO4 2-The salt of 2.2% injects Evaporating in 1 grade of salt pond, the potassium content in detection salt reaches 0.55%, and solid-liquid separation, salt imports in 2 grades of salt ponds Evaporation, amount of solid 4.28kg；
Detect in 2 grades of salt ponds potassium content in salt and reach 0.57%, solid-liquid separation, salt imports in 3 grades of salt ponds and evaporates, Amount of solid 3.22kg；
Detect the potassium content in 3 grades of salt pond salt and reach 0.60%, solid-liquid separation, salt imports in 4 grades of salt ponds and evaporates, Amount of solid 2.60kg；
Same operational approach, the potassium content in detection salt reaches or close to after theoretical expectation values, leads the most successively Enter in next stage salt pond and evaporate, potassium content in 4,5,6,7,8 salt pond salt successively reaches 0.63,0.79,0.90, 1.20,2.35%, amount of solid is respectively 2.21,2.15,1.95,1.85,1.74kg.
(6) every one-level mother solution carries 25% secretly.
(7) being calculated as follows of potassium yield:
General potassium amount: K+ Just% × salt total amount=0.25% × 100=25kg
Mother solution entrainment loss in the solid-liquid separation of every one-level salt pond: K during every one-level solid-liquid separation+ n% × every one-level Solid-liquid weight a separatedn× mother solution is carried secretly, such as: 0.55 × 4.28 × 25%=0.59kg.
1, the potassium of 2,3,4,5,6,7,8 salt pond solid-liquid separation losses be respectively as follows: 0.59,0.46,0.39,0.35, 0.42,0.44,0.56,1.02kg, add up to 4.226kg.
Potassium yield: (25-4.226)/25 × 100%=83.0%
Comparative example 1
A kind of salt field process method improving potassium yield in low grade brine, comprises the following steps:
(1) taking Qinghai balun Ma Hai sulfate type salt lake brine, analytical chemistry forms, salt consist of K+、 Mg2+、Na+、Cl-、SO4 2-It is main solution, wherein K+Mass content is 0.25%, Mg2+Mass content is 1.5%, Na+Mass content is 9.8%, Cl-Mass content is 17.2%, SO4 2-Mass content is 2.2%；
(2) by five yuan of phasor K+,Mg2+,Na+,Cl-,SO4 2-//H2O calculates, and this salt separated out in the sodium chloride stage Total amount 20kg, K in liquid phase+It is saturated that concentration reaches potassium when 2.20%.
(3) taking 100kg salt as raw material, be placed in vaporization chamber, electric fan is interrupted air draft；
(4) evaporation process monitoring solid, liquid mutually in K+Content, comparing calculation solid, liquid phase content, when in solid phase During the 20-30% of content >=liquid content, illustrate that the potassium in salt is saturated, stop evaporation, solid-liquid separation,
(4) K in liquid phase+Content 2.3%, solid NaCl weight 19.0kg, the mother solution in solid carries secretly respectively 15.0%, 20%, 25%, to potassium yield see (5).
(5) potassium 19.0 × 2.3% × 15%=0.0655kg of mother solution entrainment loss,
Potassium ion yield (100 × 0.25%-0.0655)/(100 × 0.25%)=73.8%；
Potassium 19.0 × 2.3% × 20%=0.0874kg of mother solution entrainment loss,
Potassium ion yield (100 × 0.25%-0.0874)/(100 × 0.25%)=65.0%；
Potassium 19.0 × 2.3% × 30%=0.1092kg of mother solution entrainment loss,
Potassium ion yield (100 × 0.25%-0.1092)/(100 × 0.25%)=56.3%.
After embodiment 1-3 and comparative example 1 are it can be seen that use multistage salt pan method of evaporating, potassium yield reaches More than 83%, 90% can be reached.And using traditional salt pan method of evaporating, the highest ability of its yield is to 73.8%.
It should be noted last that, above example is only in order to illustrate technical scheme and unrestricted.Although With reference to embodiment, the present invention is described in detail, it will be apparent to an ordinarily skilled person in the art that the present invention Technical scheme modify or equivalent, without departure from the spirit and scope of technical solution of the present invention, it is equal Should contain in the middle of scope of the presently claimed invention.

Claims (4)

1. improve a multistage salt pan method of evaporating for potassium yield in low grade brine, said method comprising the steps of:
1) take any type of salt lake bittern, determined the hydrochemical type of this salt by the chemical composition analyzing salt, Again according to the hydrochemical type of this salt, and by this bittern evaporation of corresponding PHASE DIAGRAM CALCULATION to potassium ion saturated time solid Body sodium chloride separate out amount A and
2) salt pan progression n and common ratio q is calculated according to the following equation；
N=K+ max/KJust +, K+ JustFor K in salt+Initial concentration, n takes positive integer；
Q=2.44-0.124n；
3) potassium content K in every one-level salt is calculated according to salt pan progression n and common ratio q+ n；
K1 +%=K+ max/(qn-1+qn-2+……+q2+q+1)；
K2 +%=K+ max/(qn-2+qn-3+……+q2+q+1)；
K3 +%=K+ max/(qn-3+qn-4+……+q2+q+1)；
……；
Kn-1 +%=K+ max/(q+1)；
Kn +%=K+ max；
4) calculate, according to salt pan progression n and common ratio q, amount a that every one-level salt pan solid sodium chloride separates outn；
Bn=A/ (qn+qn-1+……+q2+q+1)；
Bn-1=A/ (qn-1+qn-2+……+q2+q+1)；
……；
B2=A/ (q2+q+1)；
B1=A/ (q+1)；
B=Bn+Bn-1+…+B1；
Cn=Bn/B；
……；
C1=B1/B；
an=A × Cn；
……；
a1=A × C1；
5) according to step 3), 4) the amount monitoring that separates out of the potassium content in salt pans at different levels that sets and solid sodium chloride The evaporation process in salt pans at different levels, when in certain one-level salt pan of n level salt Tanaka, potassium content or solid sodium chloride separate out Amount when reaching setting value, this grade of salt pan is carried out solid-liquid separation, the mother solution of isolated enters next stage salt pan and continues Continuous evaporation, until solid-liquid separation has been evaporated in n-th grade of salt pan, yield >=83.0% of potassium ion in final mother solution.
A kind of multistage salt pan method of evaporating improving potassium yield in low grade brine the most according to claim 1, It is characterized in that, described salt lake bittern is Qinghai balun Ma Hai sulfate type salt lake brine.
A kind of multistage salt pan method of evaporating improving potassium yield in low grade brine the most according to claim 1, It is characterized in that, described n is the positive integer more than 1.
A kind of multistage salt pan method of evaporating improving potassium yield in low grade brine the most according to claim 1, It is characterized in that, during every one-level salt pan solid-liquid separation, in solid, entrainment mother liquor amount accounts for the 15-25% of solid gross mass.
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