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Preparation method of magnesium particle slow-release potassium fertilizer

A slow-release potassium fertilizer and granule technology, applied in the direction of potassium fertilizer, magnesium fertilizer, magnesium sulfate, etc., can solve the problems of affecting plant yield and quality, yellowing, etc., and achieve the effect of high purity and low temperature

Inactive Publication Date: 2018-06-22
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Magnesium is the fourth essential nutrient element, an important part of chlorophyll, and the only metal element in chlorophyll. The physiological role of magnesium in plants lies in its participation in plant metabolism. If it is insufficient, chlorophyll is difficult to produce, and plant leaves will be damaged. It will lose green and turn yellow, and photosynthesis will not proceed, which greatly affects the yield and quality of plants

Method used

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  • Preparation method of magnesium particle slow-release potassium fertilizer
  • Preparation method of magnesium particle slow-release potassium fertilizer
  • Preparation method of magnesium particle slow-release potassium fertilizer

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Embodiment approach

[0034] (1) Weigh 100 grams of low-grade magnesite powder, pour 0.01 grams of surfactant into 100 milliliters of deionized water with a pH value of 11, stir, and modify the surface for 5 minutes.

[0035] (2) The modified magnesite powder is obtained by filtration, and the mother liquor is recycled.

[0036] (3) Pour 100 grams of modified magnesite powder into a 500 ml three-necked flask, measure 100 ml of concentrated sulfuric acid with a measuring cylinder, dilute to 50% (mass ratio), 30 drops / min, and drop into the three-necked flask , start stirring at 300 rpm, heat up to 35°C-85°C, and react for 1 to 3 hours.

[0037] (4) Carbon dioxide, compressed and liquefied.

[0038] (5) Pour 50ml of magnesium sulfate solution (concentration in Baume degrees) and 25g of potassium chloride into a beaker, add 100ml of distilled water and stir for 20min. There is no obvious reaction, and a transparent solution appears after the reaction. The solution was poured into a 1000ml distillati...

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Abstract

The invention discloses a preparation method of a magnesium particle slow-release potassium fertilizer, and relates to a preparation method of a potassium fertilizer. The preparation method comprisesthe steps: low-grade magnesite (magnesium oxide content less than or equal to 40%) is used as a raw material, after crushing, milling and sieving are carried out, magnesite powder is modified by a surface active agent; the modified magnesite powder directly conducts reaction with sulfuric acid to form magnesium sulfate heptahydrate, and released carbon dioxide is recovered; obtained magnesium sulfate filtrate is mixed with potassium chloride to dissolve, a mixed compound is obtained by evaporating and is combined with a binder, and a granule mixed compound is prepared through a turntable method; and the obtained granule mixed compound is combined with a coating agent to prepare the magnesium particle slow-release potassium fertilizer. The process realizes direct chemical utilization of themagnesite, and produces the magnesium sulfate heptahydrate; the dual utilization of magnesium and carbon is realized, and complete utilization of the low-grade magnesite is truly achieved; the wholeprocess is zero-emission, and belongs to green chemical industry technology.

Description

technical field [0001] The invention relates to a preparation method of potassium fertilizer, in particular to a preparation method of magnesium granule slow-release potassium fertilizer. Background technique [0002] In the use of magnesite in China, in order to produce refractory materials, there is a problem that high-quality magnesite is over-mined and used, but low-grade magnesite or fine ore and tailings are not fully utilized. The problem of mine vegetation restoration is serious, and the comprehensive utilization of resources is not high. Not only are there few product varieties, but the product grades are also not high. [0003] So far, the chemical utilization of magnesite is only to use light-calcined magnesite as raw material after magnesite calcining, and then react with sulfuric acid or hydrochloric acid to form magnesium sulfate heptahydrate or magnesium chloride hexahydrate, and carbon dioxide is directly emitted during the calcination process If it is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40C05D5/00C05G3/00
CPCC01F5/40C05D1/02C05D5/00C05G5/30
Inventor 王国胜唐凤翔徐蓉徽贾璇张恩磊孟丹聂鑫
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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