CN108516872A - A method of improving powder potash magnesium sulphate fertilizer granularity - Google Patents
A method of improving powder potash magnesium sulphate fertilizer granularity Download PDFInfo
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- CN108516872A CN108516872A CN201810579882.XA CN201810579882A CN108516872A CN 108516872 A CN108516872 A CN 108516872A CN 201810579882 A CN201810579882 A CN 201810579882A CN 108516872 A CN108516872 A CN 108516872A
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- filter cake
- temperature
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- mother liquor
- washing
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
- C05D1/02—Manufacture from potassium chloride or sulfate or double or mixed salts thereof
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses it is a kind of improve powder potash magnesium sulphate fertilizer granularity method, 1）The soft potassium concentrate foam containing 70% or so picromerite is made through " first turn float then " in magnesium sulfate potassium magnesium mixed salt；2）1) the soft potassium concentrate foam of gained, fresh water and washing are returned into mother liquor and press 5: 1: 4 mixing, washing 30min；3）2) slurry filtration separation obtained, a filtrate part in are returned into room temperature conversion, another part returns to sink and adjusts concentration；4）3) gained filter cake is entered into high-temperature stirring slot, 80 DEG C of hot water of filter cake weight 70% are added, 30min is mixed in 50-55 DEG C of ranges in conversion temperature control；5）4) gained ore pulp is filtered separation, obtains free water content 8% or so, the filter cake that total moisture content is 31% or so, high temperature mother liquor returns to high-temperature stirring slot and recycles use of sizing mixing；6）5) 1.5h is dried under 150 DEG C of environment in the filter cake being separated by filtration in, potassic-magnesian fertilizer Grade A is made.The present invention can effectively overcome the shortcomings that " first turning to float afterwards " technique.
Description
Technical field
The invention belongs to technical field of salt chemical industry more particularly to a kind of methods improving powder potash magnesium sulphate fertilizer granularity.
Background technology
The technique of picromerite relative maturity is produced from sulfate type salt lake brine, is all first to obtain bittern evaporation
Potassium magnesium mixed salt, subsequently through conversion method extracting sulfuric acid potassic-magnesian fertilizer.Conversion method, including first turn to float afterwards, first float and turn afterwards and two sections of conversions
Three kinds of modes.Flotation after first converting first adds water or mother liquor that kainite is converted to picromerite flotation again, realizes soft potassium magnesium
The separation of alum and NaCl and epsomite, obtain picromerite product (CN03134289.2, CN200610008787.1,
CN011136421 etc.)；The method that patent CN101481265A is proposed is converted after first flotation, i.e., in first flotation removal mixed salt
Impure mineral NaCl and epsomite obtain kainite and add water conversion, obtain picromerite product（Other similar patents are also
There are CN101927214, CN200610008786.7 etc.）；Two sections of conversions are to add two sections of water to turn using salt pan potassium magnesium mixed salt as raw material
Change, mechanical removing sodium prepare picromerite (ZL03157856.X, CN1288084C), and the disadvantages of this method is flotation stage tailing
A large amount of two turns of mother liquors are taken away in discharge, cause potassium yield relatively low, and impurity, the product Na+ contents such as floating concentrate entrainment sodium chloride of institute are higher,
And it can only obtain the potassic-magnesian fertilizer Grade A for meeting national standard.
" first turning to float afterwards " process stabilizing, is affected by temperature small, and easy to operate, industrialization easy to implement, major defect has：One
It is that washing gained semi-finished product granularity is meticulous, causes rear system Dust Capacity big；Second is that washing resulting material is mainly picromerite, into
Two crystallizations water are quickly sloughed after entering drying system, material is caused to lump, block drying drum；Third, products obtained therefrom granularity mistake
Carefully, heap density is low, and packaging is difficult, stacks easily caking for a long time.
Invention content
It is follow-up by changing washing the purpose of the present invention is to provide a kind of method improving powder potash magnesium sulphate fertilizer granularity
The shortcomings that workshop section's processing method realization product granularity increases, can effectively overcome " first turning to float afterwards " technique.
The object of the present invention is achieved like this, a method of raising powder potash magnesium sulphate fertilizer granularity, 1）Magnesium sulfate is sub-
The soft potassium concentrate foam containing 70% or so picromerite is made through " first turn float then " technique in type potassium magnesium mixed salt；2）Obtained by step 1)
It is 5: 1: 4 mixing that soft potassium concentrate foam, fresh water and washing, which return to mother liquor by weight, washing 30min；3）It will be made in step 2)
Slurry filtration separation, a filtrate part return room temperature conversion, another part return sink adjust concentration；4）By step 3) institute
It obtains filter cake and enters high-temperature stirring slot, 80 DEG C of hot water of filter cake weight 70% are added, conversion temperature control is mixed in 50-55 DEG C of ranges
Close stirring 30min；5）Ore pulp obtained by step 4) is filtered separation, obtains free water content 8% or so, total moisture content is
31% or so filter cake, high temperature mother liquor return to high-temperature stirring slot and recycle use of sizing mixing； 6）By what is be separated by filtration in step 5)
1.5h is dried under 150 DEG C of environment in filter cake, and potassic-magnesian fertilizer Grade A is made.
The present invention is ensureing potassium yield and energy consumption not on the basis of " first turning to float afterwards " potash magnesium sulphate fertilizer technological process of production
Under the premise of change, by back segment heating hand-held potassium persulfate fertiliser containing magnesium semi-finished product granularity, reaches and solve a systems such as dust, drying, packaging
The purpose of row problem.
By workshop long run test verification in 72 hours ,+100 mesh content of products obtained therefrom is increased to 70% by 40%；Heap is close
Degree is increased to 1.05g/ml by 0.89g/ml.Semi-finished product are not required to stack predrainage, it can be achieved that continuous drying operation, successfully solves powder
Dirt and packaging Problems.
The main feature of the present invention：1）Product granularity is improved, packaging process is solved and falls bag, sack is excessive, stores easily knot
The problems such as block；2）Dust Capacity is reduced, improves operating environment, prevents the pollution of the environment；3）It realizes continuous drying operation, stockyard is avoided to raise
Material pollution environment, cost management easy to produce；4）Relative to high-temperature wash technique, energy can be greatly reduced in high temperature mother liquor local circulation
Consumption avoids high temperature mother liquor from returning and generates interference to leading portion conversion operation.
Description of the drawings
Below in conjunction with attached drawing, the present invention is described in further detail.
Fig. 1 is the principle process flow chart of the present invention.
Specific implementation mode
A method of powder potash magnesium sulphate fertilizer granularity being improved, referring to Fig.1, processing step is as follows：1）Magnesium sulfate potassium
The soft potassium concentrate foam containing 70% or so picromerite is made through " first turn float then " technique in magnesium mixed salt；2）By soft potassium obtained by step 1)
It is 5: 1: 4 mixing that concentrate foam, fresh water and washing, which return to mother liquor by weight, washing 30min；3）By mine obtained in step 2)
Slurry is separated by filtration, and a filtrate part returns to room temperature conversion, and another part returns to sink and adjusts concentration；4）It will be filtered obtained by step 3)
Cake enters high-temperature stirring slot, and 80 DEG C of hot water of filter cake weight 70% are added, and conversion temperature is controlled in 50-55 DEG C of ranges, and mixing is stirred
Mix 30min；5）Ore pulp obtained by step 4) is filtered separation, obtains free water content 8% or so, total moisture content is 31% left
Right filter cake, high temperature mother liquor return to high-temperature stirring slot and recycle use of sizing mixing； 6）The filter cake being separated by filtration in step 5) is existed
It is dried under 150 DEG C of environment 1.5 hours, potassic-magnesian fertilizer Grade A is made.The percentage is mass percent.
Claims (1)
1. a kind of method improving powder potash magnesium sulphate fertilizer granularity, it is characterised in that：It is produced according to the following steps, 1）Sulfuric acid
The soft potassium concentrate foam containing 70% or so picromerite is made through " first turn float then " technique in magnesium hypotype potassium magnesium mixed salt；2）By step 1)
It is 5: 1: 4 mixing that the soft potassium concentrate foam of gained, fresh water and washing, which return to mother liquor by weight, washing 30min；3）It will be in step 2)
Slurry filtration separation obtained, a filtrate part return to room temperature conversion, and another part returns to sink and adjusts concentration；4）By step
3) gained filter cake enters high-temperature stirring slot, and 80 DEG C of hot water of filter cake weight 70% are added, and conversion temperature is controlled in 50-55 DEG C of models
It encloses, 30min is mixed；5）Ore pulp obtained by step 4) is filtered separation, obtains free water content 8% or so, total moisture contains
The filter cake that amount is 31% or so, high temperature mother liquor return to high-temperature stirring slot and recycle use of sizing mixing； 6）It will be separated by filtration in step 5)
To filter cake 1.5h is dried under 150 DEG C of environment, potassic-magnesian fertilizer Grade A is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810579882.XA CN108516872A (en) | 2018-06-07 | 2018-06-07 | A method of improving powder potash magnesium sulphate fertilizer granularity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810579882.XA CN108516872A (en) | 2018-06-07 | 2018-06-07 | A method of improving powder potash magnesium sulphate fertilizer granularity |
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| CN108516872A true CN108516872A (en) | 2018-09-11 |
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| CN201810579882.XA Pending CN108516872A (en) | 2018-06-07 | 2018-06-07 | A method of improving powder potash magnesium sulphate fertilizer granularity |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318844A (en) * | 2008-07-13 | 2008-12-10 | 青海中信国安科技发展有限公司 | Process for preparing potassium magnesium sulfate fertilizer with two-stage conversion and floatation method |
| CN102442687A (en) * | 2010-10-13 | 2012-05-09 | 云南省化工研究院 | Method for preparing potassium chloride from solid kali salt mine through rotating decomposition and positive flotation |
| CN102757072A (en) * | 2012-08-02 | 2012-10-31 | 化工部长沙设计研究院 | Process for preparing magnesium sulfate heptahydrate |
| CN107382381A (en) * | 2017-08-31 | 2017-11-24 | 化工部长沙设计研究院 | A kind of production technology of high-quality potash magnesium sulphate fertilizer |
| CN107935637A (en) * | 2017-11-10 | 2018-04-20 | 国投新疆罗布泊钾盐有限责任公司 | A kind of method for producing top grade potassic-magnesian fertilizer |
| CN107963914A (en) * | 2017-11-10 | 2018-04-27 | 国投新疆罗布泊钾盐有限责任公司 | A kind of method that pyrolytic conversion legal system takes top grade high-grade potassic-magnesian fertilizer |
-
2018
- 2018-06-07 CN CN201810579882.XA patent/CN108516872A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318844A (en) * | 2008-07-13 | 2008-12-10 | 青海中信国安科技发展有限公司 | Process for preparing potassium magnesium sulfate fertilizer with two-stage conversion and floatation method |
| CN102442687A (en) * | 2010-10-13 | 2012-05-09 | 云南省化工研究院 | Method for preparing potassium chloride from solid kali salt mine through rotating decomposition and positive flotation |
| CN102757072A (en) * | 2012-08-02 | 2012-10-31 | 化工部长沙设计研究院 | Process for preparing magnesium sulfate heptahydrate |
| CN107382381A (en) * | 2017-08-31 | 2017-11-24 | 化工部长沙设计研究院 | A kind of production technology of high-quality potash magnesium sulphate fertilizer |
| CN107935637A (en) * | 2017-11-10 | 2018-04-20 | 国投新疆罗布泊钾盐有限责任公司 | A kind of method for producing top grade potassic-magnesian fertilizer |
| CN107963914A (en) * | 2017-11-10 | 2018-04-27 | 国投新疆罗布泊钾盐有限责任公司 | A kind of method that pyrolytic conversion legal system takes top grade high-grade potassic-magnesian fertilizer |
Non-Patent Citations (1)
| Title |
|---|
| 胡莉等: "两种硫酸盐高温转化试验研究", 《化工矿物与加工》 * |
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Application publication date: 20180911 |
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