CN1274598C - Process for preparing crystalline potassium chloride by raw bittern salt field method - Google Patents
Process for preparing crystalline potassium chloride by raw bittern salt field method Download PDFInfo
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- CN1274598C CN1274598C CN 200410073692 CN200410073692A CN1274598C CN 1274598 C CN1274598 C CN 1274598C CN 200410073692 CN200410073692 CN 200410073692 CN 200410073692 A CN200410073692 A CN 200410073692A CN 1274598 C CN1274598 C CN 1274598C
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- mother liquor
- repone
- potassium chloride
- carnallitite
- teds
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Abstract
Potassium chloride is the main variety of agricultural potassium fertilizer as well as the main raw material for preparing other potassium salts in industry. The method is an invention for the production of high-quality crystal potassium chloride, and the purpose is to overcome the defects of the prior art. The present invention is a method which does not waste resources, has high recovery rate, does not pollute the environment, takes bittern as raw materials, does not have long lines of raw material transportation and workshop production, and directly prepares finished potassium chloride by solarizing a large-area salt field. The method has the process that potassium chloride, magnesium chloride and sodium chloride are prepared by mother solution according to the content of the potassium chloride, the magnesium chloride and the sodium chloride in bittern, and the component content can reach a certain specific value, and then the mixture is pumped to a preset salt field to be solarized after spread. After carnallite is washed by solution which is prepared in advance, freshwater is added to dissolve the carnallite to saturation; after being clarified, the saturated carnallite solution is pumped to a crystallization pool of potassium chloride to be solarized after spread; the solution is concentrated by evaporation, and potassium chloride crystals can be separated out by supersaturation and crystallization; by washing and drying, the grade is regulated between 90% and 95%. The method of the present invention adopts natural solarization by spread and successive recovery, does not use chemicals and does not need temperature rise and heating by fire coal. Accordingly, energy can be saved, and environmental pollution does not exist. Due to the adoption of the large-area operation of a salt field, the cost is very low, the yield is large and concentrated, and the grade is uniform. While potassium chloride is purified, byproducts-sodium chloride and magnesium chloride are.
Description
Technical field
The present invention relates to the alkali metal halide technical field, specifically a kind of preparation method of Repone K.
Background technology
Repone K is the principal item of agriculture potash fertilizer, also is the industrial main raw material of producing other sylvite.The Repone K manufacturing enterprise of China 90% continues to use production methods such as traditional positive and negative " flotation " and thermosol at present, all be that raw material " carnallitite " is passed through forklift entrucking, automobile roping to the workshop stock yard from the salt pan, by the dozer material loading, links such as process charging machine, rotary conveyor, disassembler, flotation machine, whizzer, dryer are packed and are dispatched from the factory again.More than the method for Sheng Chaning all is to found the factory that investment is big, cost is high, and machine is numerous, and process is heavy long, and controlling unit is many, and the rate of recovery is low, all needs chemical agent to add and coal-fired consumption.And link control is bad arbitrarily, and low-grade Repone K product all will emerge in an endless stream.The E halogen F halogen that also has part enterprise to adopt is converted halogen and is gone out carnallitite in converting the halogen device, carnallitite secondary washing drying and packaging is dispatched from the factory again; Adding halogen method needs a large amount of E halogen and F halogen, and the investment of founding the factory is big, and the rate of recovery is low.
Summary of the invention
The present invention is the shortcoming that overcomes in the prior art, and proposing a kind of is the method that the high saltpan method free from environmental pollution of raw material, the rate of recovery is produced Repone K with former halogen.
Concrete technical scheme of the present invention is:
A kind of method of process for preparing crystalline potassium chloride by raw bittern salt field may further comprise the steps:
(1) former bittern shines in advance: former bittern is shone in advance pre-the solarization in the pond, shine and do not float to the bittern surface that salt efflorescence, concentration are between the 31Be to 32Be, KCl 〉=2%, NaCl≤0.8%, MgCl
2〉=26%, remove solid impurity, obtain mother liquor 1;
(2) shine the system carnallitite: mother liquor 1 is continued to shine, and the liquid evaporation condensing crystal is separated out " carnallitite ", when strength of fluid shines to 34～35Be, separates obtaining carnallitite and mother liquor 2;
(3) configuration of washing soln: get a part of mother liquor 2 usefulness fresh water be mixed with concentration be 31～32Be wash silk ribbon solution;
(4) washing carnallitite:, obtain thick Repone K and mother liquor 3 with the carnallitite that washing soln thorough washing step (2) obtains;
(5) thick Repone K dissolving and crystallization: the thick Repone K fresh water dissolution that step (4) is obtained is a saturated potassium chloride solution 2, and solution is tedded in clarification, crystal Repone K is separated out in crystallization, is called smart Repone K 1, when strength of solution is shone to 27～27.5Be, isolate smart Repone K 1, and obtain mother liquor 4;
(6) refining: remove mother liquor with fresh water detergent Repone K 1, obtain smart Repone K 2 and mother liquor 6, drying obtains the crystalline potassium chloride product again.
Described mother liquor 3 teds separately according to step (2) or teds according to step (2) with mother liquor 1 merging, obtains carnallitite.
Described mother liquor 4 continues to ted, and when shining to 39～30Be, separates obtaining thick Repone K and mother liquor 5.
Described mother liquor 5 teds separately according to step (2) or teds according to step (2) with mother liquor 1 merging, obtains carnallitite.
Described mother liquor 6 teds separately according to step (5) or teds according to step (5) with solution 2 merging, obtains smart Repone K 1.
Former bittern in the step (1) shines to Repone K when saturated, separate solid impurity or change the pond and continue to ted and make carnallitite.
Described carnallitite is directly used fresh water dissolution according to step (5) without the described washing process of step (4), teds, and separates obtaining smart Repone K 1.
Described thick Repone K directly makes smart Repone K 1 with the fresh water washing without the dissolving and the crystallization of step (5).
Described mother liquor 2 is evacuated to the other pond of tedding and teds to continuing, and obtains Magnesium dichloride hexahydrate.
The employed various ponds of tedding among the present invention, make with PVC (polyvinyl chloride) plastic-coated fabric, method of construction is: launch by the pond design area with PVC (polyvinyl chloride) plastic-coated fabric heat seal or with the PVC plastic-coated fabric, between every limit and the limit overlapped 2 centimetres, be that the alpha-cyanoacrylate fat caking agent of TYPE-W3 is coated with full lap seam with model again, after treating the alpha-cyanoacrylate fat caking agent curing of TYPE-W3, seal fully with the lap seam of igelite caking agent again the bonding mistake of alpha-cyanoacrylate fat caking agent of TYPE-W3.Behind the design area of bonding intact pond, simultaneously be folded into the designed dykes and dams height dimension in pond and add 0.2 meter in addition all around to the center, pond, then outside around build dykes and dams by pond height heap, at last with unnecessary 0.2 meter dig be placed on dykes and dams above, compress with weight, prevent wind.
Advantage of the present invention and effect:
It is raw material that the present invention adopts former bittern, can economize on resources.
Because what adopt is salt pan big area operation, concentrate so the low yield of the cost utmost point is big, and grade is even.And adopt various mother liquors to ted, reclaim, thereby rate of recovery height of the present invention.
The present invention adopts the pure natural resource and the energy, does not have to increase material and the environment pollute, does not produce any objectionable impurities simultaneously, thereby the present invention is the environmental protection method, and is free from environmental pollution.
Method of the present invention is directly shone system with the big area salt pan, has saved raw material transportation and Workshop Production link, has saved production cost virtually.
Method of the present invention simultaneously can co-producing sodium chloride and magnesium chloride product.
Description of drawings
Fig. 1 is the schema of the method for expression process for preparing crystalline potassium chloride by raw bittern salt field of the present invention.
Embodiment
Adopt the mode of specific embodiment further to explain the present invention below, but the present invention is not limited to these embodiment.
Embodiment 1
The concentration that takes by weighing 1240kg is that the KCE content of 29Be is 1.6% former halogen, shining concentration in advance is 31.5Be, obtain the solution 1 of 1103kg, continue again to ted that to obtain KCE content be 22% carnallitite 81kg, obtaining KCE content through washing again is 68% thick Repone K 19.1kg, teds through dissolving and obtains 93% crystalline potassium chloride 9.12kg.
Claims (9)
1. the method for a process for preparing crystalline potassium chloride by raw bittern salt field is characterized in that it may further comprise the steps:
(1) former bittern shines in advance: former bittern is shone in advance pre-the solarization in the pond, shine and do not float to the bittern surface that salt efflorescence, concentration are between the 31Be to 32Be, KCl 〉=2%, NaCl≤0.8%, MgCl
2〉=26%, remove solid impurity, obtain mother liquor 1;
(2) shine the system carnallitite: mother liquor 1 is continued to shine, and the liquid evaporation condensing crystal is separated out carnallitite, when strength of fluid shines to 34～35Be, separates obtaining carnallitite and mother liquor 2;
(3) configuration of washing soln: get a part of mother liquor 2 usefulness fresh water and be mixed with the washing soln that concentration is 31～32Be;
(4) washing carnallitite:, obtain thick Repone K and mother liquor 3 with the carnallitite that washing soln thorough washing step (2) obtains;
(5) thick Repone K dissolving and crystallization: the thick Repone K fresh water dissolution that step (4) is obtained is a saturated potassium chloride solution 2, and solution is tedded in clarification, crystal Repone K is separated out in crystallization, is called smart Repone K 1, when strength of solution is shone to 27～27.5Be, isolate smart Repone K 1, and obtain mother liquor 4;
(6) refining: remove mother liquor with fresh water detergent Repone K 1, obtain smart Repone K 2 and mother liquor 6, drying obtains the crystalline potassium chloride product again.
2. method according to claim 1 is characterized in that, described mother liquor 3 teds separately according to step (2) or teds according to step (2) with mother liquor 1 merging, obtains carnallitite.
3. method according to claim 1 is characterized in that, described mother liquor 4 continues to ted, and when shining to 39～30Be, separates obtaining thick Repone K and mother liquor 5.
4. method according to claim 3 is characterized in that, described mother liquor 5 teds separately according to step (2) or teds according to step (2) with mother liquor 1 merging, obtains carnallitite.
5. method according to claim 1 is characterized in that, described mother liquor 6 teds separately according to step (5) or teds according to step (5) with solution 2 merging, obtains smart Repone K 1.
6. method according to claim 1 is characterized in that, the former bittern in the step (1) shines to Repone K when saturated, separate solid impurity or change the pond and continue to ted and make carnallitite.
7. method according to claim 1 is characterized in that, described carnallitite is directly used fresh water dissolution according to step (5) without the described washing process of step (4), teds, and separates obtaining smart Repone K 1.
8. method according to claim 1 is characterized in that, described thick Repone K directly makes smart Repone K 1 with the fresh water washing without the dissolving and the crystallization of step (5).
9. method according to claim 1 is characterized in that, described mother liquor 2 is evacuated to the other pond of tedding and teds to continuing, and obtains Magnesium dichloride hexahydrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410073692 CN1274598C (en) | 2004-09-01 | 2004-09-01 | Process for preparing crystalline potassium chloride by raw bittern salt field method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410073692 CN1274598C (en) | 2004-09-01 | 2004-09-01 | Process for preparing crystalline potassium chloride by raw bittern salt field method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1587048A CN1587048A (en) | 2005-03-02 |
| CN1274598C true CN1274598C (en) | 2006-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410073692 Expired - Fee Related CN1274598C (en) | 2004-09-01 | 2004-09-01 | Process for preparing crystalline potassium chloride by raw bittern salt field method |
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| CN (1) | CN1274598C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100402427C (en) * | 2005-06-01 | 2008-07-16 | 高崧耀 | Method for producing potassium chloride crystal through solarization on large area of brine pan |
| CN102923735A (en) * | 2012-09-28 | 2013-02-13 | 新疆昆金矿业有限责任公司 | Method for preparing potassium chloride through highland salt lake raw brine salt pan process |
| CN112441602A (en) * | 2019-08-28 | 2021-03-05 | 中蓝连海设计研究院有限公司 | Salt pan for recovering potassium salt at low cost and method for recovering potassium salt by adopting salt pan |
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- 2004-09-01 CN CN 200410073692 patent/CN1274598C/en not_active Expired - Fee Related
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