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Method of preparing potassium-magnesium fertilizer

A technology of potassium-magnesium fertilizer and potassium-feldspar, applied in the field of preparing potassium-magnesium fertilizer from ore, which can solve the problems that mining and utilization cannot satisfy the planting industry, technical solutions cannot be applied, and raw material restrictions are relatively large, and it is easy to popularize and use, and the cost is low , the effect of low production cost

Inactive Publication Date: 2018-09-28
UNIV FOR SCI & TECH ZHENGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual use and research process, we found that it still has the following shortcomings: 1. The ore raw material used in the above application is polyhalite, relatively speaking, the raw material restrictions are relatively large, such as potassium feldspar, which is abundant in my country, cannot be used. Technical solutions
2. The quality of the prepared potassium sulfate is not high
However, the exploitation and utilization of soluble potassium resources in salt lakes in my country cannot meet the needs of the planting industry, and about 75% of potassium fertilizers depend on imports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing potassium magnesium fertilizer, comprising the following steps:

[0024] (1) raw material preparation: 30kg polyhalite, 10kg potassium feldspar are broken into the particle of 3mm respectively, then respectively pulverized to cross 100 mesh sieves, obtain polyhalite powder and potassium feldspar powder;

[0025] (2) Roasting: Roast the polyhalite powder at 400°C for 3 hours under an inert atmosphere to obtain sintered powder 1, add magnesium sulfate to the potassium feldspar powder, and control the molar ratio of K in the potassium feldspar powder to Mg in magnesium sulfate to be 1: 1. Calcining at 300°C for 2 hours under vacuum conditions to obtain sintered powder 2;

[0026] (3) Leaching: Mix sintered powder 1 and sintered powder 2, and then immerse in water for 3 hours under ultrasonic, the frequency of ultrasonic is 30kHz;

[0027] (4) Filtration: filter the leached material to obtain a leaching solution and a filter cake, the filter cake is ...

Embodiment 2

[0030] A method for preparing potassium magnesium fertilizer, comprising the following steps:

[0031] (1) raw material preparation: 500kg polyhalite, 100kg potassium feldspar are broken into the particle of 5mm respectively, then respectively pulverized to cross 100 mesh sieves, obtain polyhalite powder and potassium feldspar powder;

[0032] (2) Roasting: Roast the polyhalite powder at 800°C for 1 h under an inert atmosphere to obtain sintered powder 1, add magnesium sulfate to the potassium feldspar powder, and control the molar ratio of K in the potassium feldspar powder to Mg in magnesium sulfate to be 1: 3. Calcining at 600°C for 4 hours under vacuum conditions to obtain sintered powder 2;

[0033] (3) Leaching: Mix sintered powder 1 and sintered powder 2, and then immerse in water for 1 hour under ultrasonic, the frequency of ultrasonic is 40kHz;

[0034] (4) Filtration: filter the leached material to obtain a leaching solution and a filter cake, rinse the filter cake ...

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Abstract

The invention discloses a method of preparing a potassium-magnesium fertilizer. The method comprises the following steps of by taking polyhalite and potash feldspar as raw materials, crushing the rawmaterials into powder, then replenishing magnesium sulfate, and performing calcination, water immersion, filtering and evaporation to prepare the potassium-magnesium fertilizer. Compared with the prior art, the method has the advantages that, firstly, by adopting the polyhalite and the potash feldspar as raw materials, the raw materials are available, the cost is low, potassium-bearing minerals which widely exist in China are fully utilized to replace brine, and the technical problem of shortage of agricultural potassium resources in China is solved; secondly, by fully utilizing potassium andmagnesium elements in the raw materials and combining with external the magnesium sulfate for further replenishment of the magnesium elements, the produced potassium-magnesium fertilizer provides thepotassium and magnesium elements required for growth of crops and is good in fertilizer efficiency; and thirdly, the preparation method is simple and is low in production requirement and production cost and liable in popularization use.

Description

technical field [0001] The invention relates to a method for preparing fertilizer, in particular to a method for preparing potassium-magnesium fertilizer from ore. Background technique [0002] Polyhalite is a kind of insoluble potassium ore, which is widely distributed in sulfate-type potassium ore, and its theoretical potassium content (K 2 O) reaches 15.6%, which is an important potential potassium resource. The world's polyhalite resources are very rich, and the research on the development and utilization technology of polyhalite is of great significance for alleviating the situation of the world's potash resources, improving the status of the potash industry, and increasing the strategic resource reserves. [0003] The structure of polyhalite is stable, and its water solubility is poor. It needs certain treatment to dissolve potassium and magnesium. It contains K + and Mg 2+ The solution is mostly used to prepare potassium sulfate or potassium-magnesium fertilizer, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05D11/00
CPCC05D1/04C05D5/00
Inventor 郭禧斌
Owner UNIV FOR SCI & TECH ZHENGZHOU
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