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A kind of method utilizing potassium chloride and langbeinite to prepare potassium magnesium sulfate fertilizer

A technology of potassium magnesium sulfate fertilizer and langbeinite, which is applied in potash fertilizers, applications, inorganic fertilizers, etc., can solve the problems of not being widely used, poor market response, and low user acceptance, and achieve easy scale production and production Low cost, good water solubility

Active Publication Date: 2020-11-06
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application CN 103172451A (a new type of potassium magnesium sulfate fertilizer and its preparation method) mainly introduces a new type of potassium magnesium sulfate fertilizer prepared by mixing trace elements such as manganese, zinc, boron, potassium sulfate and magnesium sulfate through a blending method method, the new potassium magnesium sulfate fertilizer has the advantages of quick fertilizer effect, comprehensive nutrition and easy application, but its water-soluble potassium (K 2 O) content is only 22%
Chinese patent application CN 104261940 A (a kind of preparation method of potassium and magnesium fertilizer) discloses the process of preparing potassium and magnesium sulfate fertilizer by transformation and flotation by utilizing high-magnesium salt lake brine, Glauber's salt and potassium chloride and phase diagram theory knowledge, which has Low energy consumption, low cost, simple technological process, short production cycle, etc., but its water-soluble potassium (K 2 O) content is only about 22%
[0008] Water-soluble potassium (K 2 O) content is less than 26%, water-insoluble content is generally greater than 3.0%, the market ex-factory price is generally 1100 yuan / ton ~ 1200 yuan / ton, and foreign new high-quality potassium magnesium sulfate fertilizer 40% water-soluble potassium (K 2 O) content, the market price of 4600 yuan / ton has a large gap, the acceptance of the majority of users is not high, the market response is not good, and it has not been widely used in crop cultivation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment includes the following steps:

[0025] (1) Include mass composition including K + 26.45%, Mg 2+ 2.76%, Na + 7.35%, Cl - 37.51%, SO 4 2- 7.93% Potassium chloride concentrate and mass composition obtained by flotation including K + 14.84%, Mg 2+ 5.31%, Na + 3.59%, Cl - 7.60%, SO 4 2- 36.40% langbeinite concentrate obtained by flotation is added to the reaction vessel according to the mass ratio of potassium chloride concentrate: oleonite concentrate=0.40:1, and then the mass of magsonite concentrate is added Fresh water with 54.54% of the sum of the mass of langbeinite concentrate; heated to 50°C and stirred;

[0026] In the present invention, the fresh water is water with a salt content≤5wt%.

[0027] (2) The solid-liquid mixture slurry obtained in step (1) is stirred and reacted for 40 minutes in a constant temperature environment with a temperature of 50° C. to obtain the reacted slurry;

[0028] (3) Filtrating the reacted slurry o...

Embodiment 2

[0032] This embodiment includes the following steps:

[0033] (1) The ion mass composition includes K + 28.86%, Mg 2+ 2.49%, Na + 6.13%, Cl - 39.06%, SO 4 2- 5.19% KCl flotation concentrate and ion mass composition including K + 15.13%, Mg 2+ 5.83%, Na + 2.91%, Cl - 7.11%, SO 4 2- 38.05% langbeinite flotation concentrate is added to the reaction vessel according to the mass ratio potassium chloride concentrate: magsonite concentrate=0.63:1, and then the mass of potassium chloride concentrate and magnesia concentrate is added. Freshwater with 67.00% of the sum of the mass of langbesonite concentrate. The temperature for heating, stirring and mixing was 53°C.

[0034] (2) The solid-liquid mixture slurry obtained in step (1) is subjected to a metathesis reaction for 50 minutes in a constant temperature environment of 53° C. to obtain the reacted slurry;

[0035] (3) Filter the reacted slurry obtained in step (2) at a constant temperature of 53°C for solid-liq...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] (1) The ion mass composition includes K + 51.56%, Mg 2+ 0.30%, Na + 0.73%, Cl - 48.39%, SO 4 2- 0.50% Potassium Chloride Flotation Concentrate with Ionic Mass Composition including composition K + 16.58%, Mg 2+ 6.01%, Na + 0.94%, Cl - 5.00%, SO 4 2- 39.30% langbeinite flotation concentrate is added to the reaction vessel according to the mass ratio of potassium chloride concentrate: magsonite concentrate=0.47:1, and then the mass of potassium chloride concentrate and magnesia concentrate is added. 58.79% fresh water of the sum of the quality of magsonite concentrate; heated and stirred at 55°C;

[0041] (2) The solid-liquid mixture slurry obtained in step (1) is subjected to metathesis reaction for 60 minutes in a constant temperature environment of 55° C. to obtain the reacted slurry;

[0042] (3) The reacted slurry obtained in step (2) is filtered at a constant temperature of 55°C for solid-liq...

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Abstract

Disclosed is a method for utilizing potassium chloride and picromerite to prepare potash magnesium sulphate fertilizer. The method comprises the steps of 1, mixing potassium chloride concentrates obtained by flotation and picromerite concentrates obtained by flotation, adding fresh water, and conducting heating, stirring and mixing; 2, making solid-liquid mixture slurry obtained in the step 1 subjected to a double decomposition reaction at the constant temperature environment of 50-55 DEG C for 40-90 min, and obtaining slurry after the reaction; 3, filtering the slurry obtained after the reaction in the step 2 at the constant temperature environment of 50-55 DEG C to achieve solid-liquid separation, and obtaining a solid S and mother liquid L; 4, drying the solid S obtained in the step 3,and obtaining the potash magnesium sulphate fertilizer product. The K2O content of the product is high, the proportion of potassium, magnesium and sulfur nutrients is reasonable, the water solubilityis good, the shelf life is long, the production cost is low, the added value of the product is high, the process flow is simple, and the large-scale production is easy to achieve.

Description

technical field [0001] The invention relates to a preparation method of high-quality potassium-magnesium sulfate fertilizer, in particular to a method for preparing high-quality potassium-magnesium sulfate fertilizer by using potassium chloride and langbeinite through metathesis reaction. Background technique [0002] Compared with traditional potassium sulphate products, potassium magnesium sulphate fertilizer increases the magnesium middle element, which can promote the formation of chlorophyll, improve crop yield and quality, and prolong the storage period of fruits. It is more suitable for vegetables, fruit trees, tobacco, tea and flowers, etc. crop application. [0003] At present, there are two common potassium magnesium fertilizers on the market. One is the traditional domestic potassium magnesium sulfate fertilizer, which is extracted by physical methods from salt lake brine or solid potassium magnesium ore. Its water-soluble potassium content (K 2 O) 22%-24%, water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05D1/02
Inventor 甘顺鹏季荣谢超郑贤福夏适胡勇蒋世鹏邹娟
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN