Process for preparing potassic-magnesian fertilizer by using polyhalite

A polyhalite, potassium-magnesium fertilizer technology, applied in potassium fertilizer, application, inorganic fertilizer and other directions, can solve the problems of low leaching rate and utilization rate, complex process, etc. consumption effect

Inactive Publication Date: 2017-02-08
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Some literatures have reported the method of preparing potassium fertilizer from polyhalite, but there are K + The leaching rate and utilization rate are low, the process is complicated, etc., and the polyhalite used does not contain sodium chloride or has a low sodium chloride content, and polyhalite ore is mostly associated with rock salt. In some areas, polyhalite The content of sodium chloride is relatively high, in order to ensure the purity of the product, it is also necessary to solve the problem of removing impurities of sodium chloride

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment takes polyhalite ore in a certain place abroad as an example, the content of NaCl in the mineral is 37.9wt%, and specifically includes the following steps:

[0034] (1) Grinding: Grinding polyhalite to -100 mesh 86wt%;

[0035] (2) Washing: wash the polyhalite ground by step (1) with water equivalent to 0.4 times the weight of the polyhalite, remove sodium chloride in the polyhalite, filter, and use water equivalent to 0.2 times the weight of the filter cake The filter cake is rinsed with water, and the sodium chloride content in the filter cake polyhalite after the rinse is 0.40wt%;

[0036] (3) Roasting: Roast the polyhalite washed in step (2) at 430°C for 40 minutes;

[0037] (4) Leaching: leaching the polyhalite roasted in step (3) (mainly used for leaching potassium and magnesium) in two-stage countercurrent with water, the liquid-solid mass ratio is 2:1; the leaching time is 40 minutes; the leaching temperature When the temperature is 80°C, the o...

Embodiment 2

[0042] This embodiment takes polyhalite ore in a foreign country as an example, the content of NaCl in the mineral is 29.3wt%, and specifically includes the following steps:

[0043] (1) Grinding: Grinding polyhalite to -100 mesh 89wt%;

[0044](2) Washing: Use the solution of polyhalite washed in step (2) of Example 1 to continue washing the polyhalite ground in step (1), filter, and rinse with water equivalent to 0.15 times the weight of the filter cake. cake, the sodium chloride content in the filter cake polyhalite after leaching is 0.46wt%;

[0045] (3) Roasting: Roast the polyhalite washed in step (2) at 450°C for 30 minutes;

[0046] (4) Leaching: leaching the polyhalite roasted in step (3) (mainly used for leaching potassium and magnesium) with secondary countercurrent water, the liquid-solid mass ratio is 3:1, the leaching time is 50min, and the leaching temperature at 90°C, filtered, K in the resulting mother liquor + If the concentration is less than 2.5wt%, cont...

Embodiment 3

[0051] This embodiment takes polyhalite ore in a foreign country as an example, the content of NaCl in the mineral is 12.5wt%, and specifically includes the following steps:

[0052] (1) Grinding: Grinding polyhalite to -100 mesh 87wt%;

[0053] (2) Washing: wash the polyhalite ground in step (1) with water equivalent to 0.25 times the weight of the polyhalite, remove sodium chloride in the polyhalite, filter, and use water equivalent to 0.2 times the weight of the filter cake The filter cake is rinsed with water, and the sodium chloride content in the filter cake polyhalite after the rinse is 0.30wt%;

[0054] (3) Roasting: Roast the polyhalite washed in step (2) at 490°C for 25 minutes;

[0055] (4) Leaching: leaching the roasted polyhalite with secondary countercurrent water, the liquid-solid mass ratio is 4:1; the leaching time is 70min; the leaching temperature is 100°C; + Concentration is less than 2.5wt%, continues to leaching polyhalite twice with mother liquor, and ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a process for preparing a potassic-magnesian fertilizer by using the polyhalite. The process comprises the steps of (1) grinding ores: grinding the polyhalite till 85wt% of the polyhalite are over 100 meshes in size; (2) washing: washing with water to remove the sodium chloride in the polyhalite; (3) roasting: roasting washed minerals at a high temperature; (4) leaching: leaching to extract potassium and magnesium in the polyhalite; (5) solid-liquid separation: subjecting the ore pulp obtained through the leaching step to solid-liquid separation so as to obtain a mother liquor containing potassium sulfate and magnesium sulfate; (6) evaporation: evaporating and crystallizing the mother liquor to obtain a potassium-magnesium fertilizer product. The process is simple, wide in source of raw materials and low in cost, wherein the sodium chloride in the polyhalite can be effectively removed. Meanwhile, the leaching rate of K+ is high and the water consumption of leaching is reduced. The concentration of K+ in the leaching mother liquor is high, and the energy consumption of the subsequent evaporation and crystallization step is reduced. The potassium-magnesium fertilizer product obtained after the evaporation step meets the requirements of first-class products specified in GB / T20937-2007.

Description

technical field [0001] The invention relates to a process for preparing potassium-magnesium fertilizer with potassium-containing minerals, in particular to a process for preparing potassium-magnesium fertilizer with insoluble polyhalite. Background technique [0002] Polyhalite (K 2 SO 4 · MgSO 4 2CaSO 4 2H 2 O), is a kind of insoluble potassium ore, which is light gray or dark gray, widely distributed in sulfate-type potassium ore, and its theoretical potassium content (K 2 O) reaches 15.6%, which is an important potash resource. The polyhalite resources in the world are very rich, and the geological ages of its production are mainly concentrated in the Permian, Triassic and Tertiary. In terms of geological plane distribution, they are relatively concentrated in the ring belt of 25°-50° north latitude . With the continuous development of high-quality potassium-containing brine resources and the scarcity of soluble solid potassium ore resources, it is necessary to loo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C05D1/04
CPCC05D1/04
Inventor 冯文平季荣高文远孙成高李昱昀谢晶磊汤建良
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap