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A kind of production technology of high-quality potassium magnesium sulfate fertilizer

A potassium-magnesium sulfate fertilizer and production technology technology, which is applied in directions such as potash fertilizers, inorganic fertilizers, fertilization devices, etc., can solve the problems of no potassium-magnesium sulfate compound fertilizer production technology, low product yield, low O content, etc., and achieves a reasonable ratio, The effect of high K2O content and simple process flow

Active Publication Date: 2020-09-15
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

At present, the domestic potassium and magnesium sulfate fertilizer market still lacks 35% K 2 O's Potassium Magnesium Sulfate Fertilizer Products
And K 2 Potassium magnesium sulfate fertilizer products with 40% O content are only German "Red Bull" potassium magnesium sulfate fertilizer products. At present, there is no K in my country. 2 Production technology of two new high-quality potassium and magnesium sulfate compound fertilizers with 35% and 40% O content
[0007] In recent years, the literature has reported a lot of research on utilizing potassium mixed salt to produce potassium and magnesium fertilizer products, such as CN101412639A, CN1482102A, etc. respectively disclose the use of potassium mixed salt to adopt two-stage fresh water heating conversion, mechanical sieving to remove rock salt, and two-stage fresh water Normal temperature conversion and other technologies produce traditional potassium and magnesium sulfate fertilizers, but the resulting product has low yield, fine particle size, and grade only reaches the requirements of the national standard GB / T20937-2007 for qualified products of potassium and magnesium sulfate fertilizers; CN101318845A, CN101318844A, etc. The process of extracting potassium and magnesium fertilizers from salt adopts one-stage fresh water conversion and second-stage fresh water conversion followed by flotation to produce potassium and magnesium sulfate fertilizers, but the product K 2 The O content is not high; the Chinese patent application No. 200710034292.0 utilizes potassium mixed salt one-step fresh water conversion, high temperature (75 ~ 90 ℃) thermal solution cooling and then mechanical sieving to remove the method of sodium salt slurry to obtain coarse particles (average particle size 3mm or more) potassium and magnesium fertilizer products, but also unresolved product K 2 The low O content problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment includes the following steps:

[0027] (1) The chemical quality composition of the soft potash magnesia concentrate obtained by the flotation of a potash fertilizer plant is K + 16.42%, Mg 2+ 5.37%, SO 4 2- 45.65%, other 32.56%; add this magnesia concentrate to fresh water, the mass ratio is magnesia: fresh water=1:2.5, while stirring, heat to 70℃ to complete the magnesia concentrate Dissolve, get liquid l 0 ;

[0028] (2) The liquid l 0 Filter, get filter residue S 1 And filtrate l 1 . Filter residue S 1 It is water insoluble matter such as silt and discarded as tailings; filtrate l 1 The chemical mass composition is K + 4.69%, Mg 2+ 1.53%, SO 4 2- 13.04%, other 80.74%.

[0029] (3) The filtrate l 1 Perform isothermal evaporation and crystallization operation at 80°C for 3 hours to obtain a crystallization slurry;

[0030] (4) Filter the crystallized slurry at a constant temperature at 80°C to obtain solid S 2 And liquid l 2 ; Solid S 2 The chemical mass ...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] (1) The ion mass composition of the magnesia concentrate obtained by the flotation of a potash fertilizer plant is K + 22.12%, Mg 2+ 6.87%, SO 4 2- 53.17%, other 17.84%; add the magnesia concentrate to fresh water, the mass ratio is magnesia: fresh water=1:4.0, while stirring, heat to 75℃ to dissolve the magnesia concentrate completely , Get liquid l 0 .

[0036] (2) The liquid l 0 Filter, get filter residue S 1 And filtrate l 1 . Filter residue S 1 It is water-insoluble matter such as silt and discarded as tailings; the resulting filtrate l 1 The chemical mass composition is K + 4.42%, Mg 2+ 1.37%, SO 4 2- 10.63%, other 83.58%.

[0037] (3) The filtrate l 1 Perform isothermal evaporation and crystallization operation at 75°C for 4 hours to obtain a crystallization slurry;

[0038] (4) Filter the crystallized slurry at a constant temperature at 75°C to obtain solid S 2 And liquid l 2 ; Solid S 2 The chemical mass com...

Embodiment 3

[0042] This embodiment includes the following steps:

[0043] (1) The chemical quality composition of the soft potash magnesia concentrate obtained by the flotation of a potash fertilizer plant is K + 24.67%, Mg 2+ 7.36%, SO 4 2- 55.49%, other 12.48%; add the magnesia concentrate to fresh water, the mass ratio is magnesia: fresh water=1:4.0, while stirring, heat to 80℃ to dissolve the magnesia concentrate completely , Get liquid l 0 ;

[0044] (2) The liquid l obtained in step (1) 0 Filter, get filter residue S 1 And filtrate l 1 . Filter residue S 1 It is water insoluble matter such as silt and discarded as tailings; filtrate l 1 The chemical mass composition is K + 6.17%, Mg 2+ 1.84%, SO 4 2- 13.87%, other 78.12%.

[0045] (3) The filtrate l 1 Perform an isothermal evaporation crystallization operation at 80°C for 5 hours to obtain a crystallization slurry;

[0046] (4) Filter the crystallized slurry at a constant temperature at 80°C to obtain solid S 2 And liquid l 2 ; Solid...

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PUM

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Abstract

The invention discloses a high-quality potash magnesium sulphate fertilizer production process which includes the steps: (1) mixing fresh water with picromerite concentrate obtained by flotation according to a certain proportion, heating and stirring the mixture until the picromerite concentrate is completely dissolved to obtain liquid l0; (2) filtering the liquid l0 obtained in the step (1) to obtain filter residues S1 and filtrate l1; (3) performing isothermal evaporation and crystallization on the filtrate l1 obtained in the step (2) to obtain crystallized slurry; (4) performing isothermal solid-liquid separation on the crystallized slurry obtained in the step (3) to obtain solid S2 and liquid l2; (5) drying and dewatering the solid S2 obtained in the step (4) to obtain a high-quality potash magnesium sulphate product. The process is simple in flow, the K2O content of the product is greatly improved as compared with that of a traditional potash magnesium sulphate fertilizer, the nutrient proportion is more reasonable, and the product is large in granularity, good in water solubility, high in additional value and still long in guarantee period in a non-sealed state.

Description

Technical field [0001] The present invention relates to a production process of potassium magnesium sulfate fertilizer, in particular to a production process for extracting high-quality potassium magnesium sulfate fertilizer from a flotation concentrate using magnesia flotation concentrate. Background technique [0002] Potassium magnesium sulfate fertilizer, molecular formula mK 2 SO 4 ·MgSO 4 ·NH 2 O, where m=1~2, n=0~6, compared with traditional potassium sulfate products, potassium magnesium sulfate fertilizer increases the element of magnesium, which can provide crops with more comprehensive and balanced nutrients, which is more suitable for vegetables and fruit trees , Tobacco, tea, flowers and other economic crops grow. [0003] At this stage, the main component of domestic potassium magnesium sulfate fertilizer is soft potassium magnesium vanadium, the molecular formula is K 2 Mg(SO 4 ) 2 ·6H 2 O, the executive standard is GB / T20937-2007, and its superior product requires w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05D1/02
CPCC05D1/02
Inventor 甘顺鹏蒋世鹏谢超季荣胡勇郑贤福杨清梁晓玲
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN