CN103738983B - Technology for preparing kainite with potassium-containing heptahydrate epsomite raw product - Google Patents
Technology for preparing kainite with potassium-containing heptahydrate epsomite raw product Download PDFInfo
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- CN103738983B CN103738983B CN201410021722.5A CN201410021722A CN103738983B CN 103738983 B CN103738983 B CN 103738983B CN 201410021722 A CN201410021722 A CN 201410021722A CN 103738983 B CN103738983 B CN 103738983B
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- kainite
- potassium
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Abstract
The invention relates to a technology for preparing kainite with a potassium-containing heptahydrate epsomite raw product. The technology comprises the following steps: (1) mixing brine according to the mass ratio of the potassium-containing heptahydrate epsomite raw product to magnesium sulfate saturated epsomite mother liquor or old brine being 1:(1-3), then adding in a heating fluid bowl for heating to 60-90 DEG C, preserving the heat for dissolution for 0.5-4 hours to obtain hot brine; (2) preserving the heat and filtering the hot brine obtained in the step (1), wherein the filter residue is crude kainite; (3) adding water with the amount of 1-4 times of the weight of the crude kainite equivalently to the crude kainite obtained in the step (2) and then washing with slurry to obtain high-quality kainite and potassium-containing repulping water; (4) returning the potassium-containing repulping water obtained in the step (3) to the step (1) to replace the epsomite mother liquor or old brine used in the step (1). According to the technology, the flow is simple, the solution temperature is low, the energy consumption is low, the production cost is low and economic benefits are good.
Description
Technical field
The present invention relates to a kind of preparation technology of kainite, especially relate to the technique preparing kainite containing the thick product of potassium seven water epsom salt that a kind of flotation process obtains.
Background technology
Potassium sulfate is China's chlorideless potassic fertilizer in short supply for a long time, kainite be prepare potassium sulfate intermediates, its chemical formula is KClMgSO
42.75H
2o.Kainite by being processed into schoenite, then adding Repone K replacement(metathesis)reaction and transforms into potassium sulfate; Or adopt operational path disclosed in the patent application of application number 201080019037.9, by preparing potassium sulfate, ammonium sulfate etc. with ammonia react.
The main preparation technology of current kainite be sulfuric acid type salt lake brine by after sun power Exposure to Sunlight concentrated brine precipitated sodium chloride, epsom salt, mother liquor evaporates further separates out sylvite mineral.China's sulfate type salt lake aboundresources, has an appointment more than 90 according to statistics; Salt, in the evaporation technology of salt pan, at epsom salt field later stage, is separated out based on epsom salt in the salt lake of this type, but along with there being a small amount of sylvite to separate out.This part sylvite general all goes out of use, and causes the waste of resource.If application number is the patent application of 201210283735.0, disclose the production technique that a kind of direct flotation extracts the thick product of magnesium sulfate heptahydrate, it prepares the thick product of seven water epsom salts, along with there being a small amount of sylvite in thick product by flotation process; If this part sylvite can be able to abundant recovery, will greatly increase the resource utilization of sylvite.At present, research is rarely had to the recycling of this part sylvite, in a small amount of report, while general employing recrystallization method is purified to magnesium sulfate heptahydrate, make potassium ion enter solution phase, solution returns salt pan circulation, but the method energy consumption is high, and can not directly obtain sylvite product.
Summary of the invention
Technical problem to be solved by this invention overcomes the deficiencies in the prior art, provides a kind of energy consumption low, and the use that production cost is low prepares the technique of kainite containing the thick product of potassium seven water epsom salt.
The present invention solve that its technical problem adopts technical scheme be: a kind of use prepares the technique of kainite containing the thick product of potassium seven water epsom salt, comprises the following steps:
(1) by containing the thick product of potassium seven water epsom salt with to the saturated epsom salt mother liquor of magnesium sulfate or old halogen in mass ratio 1:1-3 convert halogen, then add in thermosol groove and be heated to 60-90 DEG C, insulation dissolving 0.5-4 hour, obtains hot halogen;
Described is that the intermediates after part sodium-chlor are removed by means such as flotation in ore deposit, epsom salt field containing the thick product of potassium seven water epsom salt;
(2) hot for step (1) gained halogen insulation filtered, filter residue is thick kainite, and filtrate can be used for prepares high-purity epsom salt;
(3) the thick kainite of step (2) gained is added the water plasm scouring being again equivalent to thick kainite weight 1-4 times, obtain high-quality kainite and wash and starch water again containing potassium; Gained high-quality kainite can be used for preparing potassium sulfate;
(4) step (3) gained is washed and starched water again containing potassium and return step (1), replace epsom salt mother liquor used or old halogen in step (1) to use.
Further, in step (1), described epsom salt mother liquor is the saturated mother liquor of epsom salt (this mother liquor can obtain with epsom salt field mother liquor or by dissolving epsom salt), and described old halogen is old halogen field mother liquor, also can adopt MgCl
2saturated mother liquor.
Compared with prior art, the present invention has the following advantages:
(1) can reclaim potassium ion from containing the thick product of potassium seven water epsom salt, prepare kainite, potassium ion yield can up to more than 80%;
(2) technical process is simple, and solvent temperature is low, and energy consumption is low, and production cost is low, good in economic efficiency;
(3) salt pan of the same type is all applicable, has promotional value;
(4) except recovery obtains sylvite, filtrate can be used as prepares the raw material of epsom salt, and resource is effectively fully utilized, and meanwhile, without " three wastes " discharge, environmental pollution is little.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
The present embodiment comprises the following steps:
(1) mix containing the thick product of potassium seven water epsom salt (it is containing potassium ion 4wt%) with the epsom salt mother liquor saturated to magnesium sulfate be equivalent to containing the thick quality product of potassium seven water epsom salt 1 times, mother liquor magnesium ion concentration is 5 wt%, then add in thermosol groove and be heated to 70 DEG C, insulation dissolving 0.5 hour, obtains hot halogen;
Described is that the intermediates after part sodium-chlor are removed by flotation practice in ore deposit, epsom salt field containing the thick product of potassium seven water epsom salt;
(2) hot for step (1) gained halogen insulation filtered, filter residue is thick kainite, and kainite purity is 75%, and potassium ion yield is 70%;
(3) the thick kainite of step (2) gained is added the water plasm scouring being again equivalent to thick kainite weight 1 times, obtain high-quality kainite and wash and starch water again containing potassium, in high-quality kainite, kainite purity is 95%; Gained high-quality kainite can be used for preparing potassium sulfate;
(4) step (3) gained is washed and starched water again containing potassium and return step (1), replace epsom salt mother liquor used in step (1) to use.
Embodiment 2
The present embodiment comprises the following steps:
(1) will containing the thick product of potassium seven water epsom salt (it be containing potassium ion 4wt%), mix with the old halogen mother liquor saturated to magnesium sulfate be equivalent to containing the thick quality product of potassium seven water epsom salt 1 times, mother liquor magnesium ion concentration is 8 wt%, then add in thermosol groove and be heated to 70 DEG C, insulation dissolving 2 hours, obtains hot halogen;
Described is that the intermediates after part sodium-chlor are removed by flotation practice in ore deposit, epsom salt field containing the thick product of potassium seven water epsom salt;
(2) hot for step (1) gained halogen insulation filtered, filter residue is thick kainite, and kainite purity is 80%, and potassium ion yield is 75%;
(3) by the thick kainite of step (2) gained by adding the water plasm scouring being again equivalent to thick kainite weight 2 times, obtain high-quality kainite and wash and starch water again containing potassium, in high-quality kainite, kainite purity is 98%;
(4) step (3) gained is washed and starched water again containing potassium and return step (1), replace old halogen used in step (1) to use.
Embodiment 3
The present embodiment comprises the following steps:
(1) will containing the thick product of potassium seven water epsom salt (it be containing potassium ion 4wt%), mix with the old halogen mother liquor saturated to magnesium sulfate be equivalent to containing the thick quality product of potassium seven water epsom salt 3 times, mother liquor magnesium ion concentration is 8wt%, then add in thermosol groove and be heated to 70 DEG C, insulation dissolving 3 hours, obtains hot halogen;
Described is that the intermediates after part sodium-chlor are removed by flotation practice in ore deposit, epsom salt field containing the thick product of potassium seven water epsom salt;
(2) hot for step (1) gained halogen insulation filtered, filter residue is thick kainite, and kainite purity is 90%, and potassium ion yield is 65%;
(3) by the thick kainite of step (2) gained by adding the water plasm scouring being again equivalent to thick kainite weight 3 times, can obtain high-quality kainite and wash and starch water again containing potassium, in high-quality kainite, kainite purity is 98%;
(4) step (3) gained is washed and starched water again containing potassium and return step (1), replace old halogen used in step (1) to use.
Embodiment 4
The present embodiment comprises the following steps:
(1) will containing the thick product of potassium seven water epsom salt (it be containing potassium ion 4wt%), mix with the epsom salt field mother liquor saturated to magnesium sulfate be equivalent to containing the thick quality product of potassium seven water epsom salt 4 times, mother liquor magnesium ion concentration is 5 wt%, then add in thermosol groove and be heated to 90 DEG C, insulation dissolving 4 hours, obtains hot halogen;
Described is that the intermediates after part sodium-chlor are removed by flotation practice in ore deposit, epsom salt field containing the thick product of potassium seven water epsom salt;
(2) hot for step (1) gained halogen insulation filtered, filter residue is thick kainite, and kainite purity is 70%, and potassium ion yield is 85%;
(3) by the thick kainite of step (2) gained by adding the water plasm scouring being again equivalent to thick kainite weight 4 times, obtain high-quality kainite and wash and starch water again containing potassium, in high-quality kainite, kainite purity is 98%;
(4) step (3) gained is washed and starched water again containing potassium and return step (1), replace epsom salt mother liquor used in step (1) to use.
Claims (2)
1., by the technique preparing kainite containing the thick product of potassium seven water epsom salt, it is characterized in that, comprise the following steps:
(1) by containing the thick product of potassium seven water epsom salt with to the saturated epsom salt mother liquor of magnesium sulfate or old halogen in mass ratio 1:1-3 convert halogen, then add in thermosol groove and be heated to 60-90 DEG C, insulation dissolving 0.5-4 hour, obtains hot halogen;
(2) hot for step (1) gained halogen insulation filtered, filter residue is thick kainite;
(3) the thick kainite of step (2) gained is added the water plasm scouring being again equivalent to thick kainite weight 1-4 times, obtain high-quality kainite and wash and starch water again containing potassium;
(4) step (3) gained is washed and starched water again containing potassium and return step (1), replace epsom salt mother liquor used or old halogen in step (1) to use.
2., according to claim 1 by the production technique preparing kainite containing the thick product of potassium seven water epsom salt, it is characterized in that, in step (1), described epsom salt mother liquor is the saturated mother liquor of epsom salt, and described old halogen is old halogen field mother liquor or MgCl
2saturated mother liquor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410021722.5A CN103738983B (en) | 2014-01-17 | 2014-01-17 | Technology for preparing kainite with potassium-containing heptahydrate epsomite raw product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410021722.5A CN103738983B (en) | 2014-01-17 | 2014-01-17 | Technology for preparing kainite with potassium-containing heptahydrate epsomite raw product |
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| Publication Number | Publication Date |
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| CN103738983A CN103738983A (en) | 2014-04-23 |
| CN103738983B true CN103738983B (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410021722.5A Active CN103738983B (en) | 2014-01-17 | 2014-01-17 | Technology for preparing kainite with potassium-containing heptahydrate epsomite raw product |
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| CN112047364A (en) * | 2020-09-22 | 2020-12-08 | 青海省柴达木综合地质矿产勘查院 | Method for preparing picromerite from magnesium sulfate subtype brine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3598522A (en) * | 1968-07-18 | 1971-08-10 | Nat Lead Co | Conversion of potassium-magnesium double salts into kainite |
| CN1335260A (en) * | 2001-09-07 | 2002-02-13 | 中信国安锂业科技有限责任公司 | Halogenation process of preparing KCl |
| CN1751999A (en) * | 2005-07-30 | 2006-03-29 | 中蓝连海设计研究院 | Method of preparing low sodium carnallite by blending halogen |
| CN1887817A (en) * | 2006-07-21 | 2007-01-03 | 中蓝连海设计研究院 | Process of preparing magnesium potassium fertilizer directly from bittern |
-
2014
- 2014-01-17 CN CN201410021722.5A patent/CN103738983B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3598522A (en) * | 1968-07-18 | 1971-08-10 | Nat Lead Co | Conversion of potassium-magnesium double salts into kainite |
| CN1335260A (en) * | 2001-09-07 | 2002-02-13 | 中信国安锂业科技有限责任公司 | Halogenation process of preparing KCl |
| CN1751999A (en) * | 2005-07-30 | 2006-03-29 | 中蓝连海设计研究院 | Method of preparing low sodium carnallite by blending halogen |
| CN1887817A (en) * | 2006-07-21 | 2007-01-03 | 中蓝连海设计研究院 | Process of preparing magnesium potassium fertilizer directly from bittern |
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