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Potassium polyphosphate slow-dissolving compound fertilizer and its preparation method and application

A technology of potassium polyphosphate and compound fertilizer, applied in ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, application and other directions, can solve the problems of increasing the cost of transportation and packaging, prone to agglomeration, etc. Agglomeration, high fertilizer effect

Active Publication Date: 2022-04-29
YUNNAN ADDIPHOS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium tripolyphosphate, potassium pyrophosphate and potassium dihydrogen phosphate all have the characteristics of easy moisture absorption, and they are prone to agglomeration when used with nitrogen fertilizers, which will affect the use. Therefore, they are mostly made into water formulations and shipped in packaging drums. Will increase shipping packaging costs

Method used

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  • Potassium polyphosphate slow-dissolving compound fertilizer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] The preparation method of the potassium polyphosphate slow-dissolving compound fertilizer provided by the present embodiment may further comprise the steps:

[0077] (1) Put 61.22g of potassium hydroxide with a content of 98.5% in a 500ml beaker, add water to make a solution with a mass fraction of 55%, take 80.75g of phosphoric acid with a mass fraction of 85.1%, and slowly dissolve the phosphoric acid while stirring. Pour into a beaker containing potassium hydroxide solution, and mix well to obtain a clear neutralization solution;

[0078] (2) Add the neutralization solution obtained in step (1) into a ceramic evaporating dish, then place it in a muffle furnace, heat up, and heat at a constant temperature of 800°C for 4 hours, dehydration and polymerization, to obtain a high-temperature melt, and lose weight on ignition 0.1%;

[0079] (3) Carefully take out the ceramic evaporating dish that is equipped with high-temperature melt with pliers, and pour it on a clean st...

Embodiment 2

[0085] The preparation method of the potassium polyphosphate slow-dissolving compound fertilizer provided by the present embodiment may further comprise the steps:

[0086] The preparation method is basically the same as that of Example 1, the only difference being that the potassium hydroxide potassium source is replaced by potassium carbonate K 2 CO 3 , and change its dosage. Concretely, step (1) comprises: adding water to 77.26g content of 95.0% potassium carbonate to make a 55% solution is placed in a 500ml beaker, taking 80.75g concentration of 85.1% phosphoric acid, slowly pouring it into the beaker while stirring, mixing After uniformity, a clear neutralization solution is obtained. All the other steps (2), (3), (4) and (5) are the same as in Example 1.

[0087] The same method as in Example 1 was used for detection, and it was found that basically the same results could be achieved.

Embodiment 3

[0089] The preparation method of the potassium polyphosphate slow-dissolving compound fertilizer provided by the present embodiment may further comprise the steps:

[0090] (1) getting 0.8046kg mass fraction is 85.15% food grade phosphoric acid and 0.6091kg mass fraction is 98.5% food grade potassium hydroxide, potassium hydroxide is dissolved in water and made mass fraction is 55% solution, while stirring Slowly add potassium hydroxide solution into phosphoric acid to carry out neutralization reaction to obtain a clear neutralization solution;

[0091] (2) Add the neutralizing solution into a fixed cellar-type polymerization furnace, heat and dehydrate and polymerize at 850° C. to obtain a high-temperature melt with a weight loss on ignition of 0.1%;

[0092] (3) After the high-temperature melt is kept at 800±25° C. for a certain period of time, the weight loss on ignition of sampling analysis is: 0.2%, and at 850±25° C., adjust the heating heat and the amount of neutralizing...

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Abstract

The invention relates to the technical field of water-soluble compound fertilizers, in particular to slow-dissolving potassium polyphosphate compound fertilizers and their preparation methods and applications. The preparation method of the potassium polyphosphate slow-dissolving compound fertilizer comprises the following steps: uniformly mixing the potassium source solution and phosphoric acid to obtain a neutralization solution; the neutralization solution is dehydrated and polymerized by heating to obtain a molten glass body; the glass body is quenched and secondarily After cooling, crushing and sieving, solid potassium polyphosphate slow-dissolving compound fertilizer is obtained; the potassium source includes potassium carbonate and / or potassium hydroxide; the mass ratio of phosphoric acid and potassium carbonate is 7-9:6-8; phosphoric acid and The mass ratio of potassium hydroxide is 7-9:5-7; the mass fraction of phosphoric acid is 80%-90%. By using specific raw materials, controlling a specific material ratio, heating and dehydrating polymerization at a specific temperature, and then quenching, cooling, and crushing, the potassium polyphosphate with specific components accounting for 50% of phosphorus and potassium and excellent performance is obtained. Slow soluble compound fertilizer.

Description

technical field [0001] The invention relates to the technical field of water-soluble compound fertilizers, in particular to high-phosphorus potassium polyphosphate slow-dissolving compound fertilizers and their preparation methods and applications. Background technique [0002] The existing water-soluble fertilizer sources in China include potassium fertilizer, nitrogen fertilizer and phosphorus fertilizer. Among them, potassium fertilizers include potassium phosphate, potassium chloride, and potassium nitrate, etc., phosphate fertilizers include ammonium phosphate, potassium phosphate, etc., and nitrogen fertilizers include ammonium bicarbonate, ammonium nitrate, and urea. However, the above-mentioned fertilizer sources have the disadvantages of high leaching property, difficulty in long-term retention in the soil, low fertilizer utilization rate, and repeated use will increase labor force and increase cost. [0003] In recent years, potassium tripolyphosphate and potassiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05B7/00C05G3/40C01B25/41
CPCC05B7/00C05G3/40C01B25/41C01P2006/80C05B17/00C05D1/00
Inventor 李敬民李雯
Owner YUNNAN ADDIPHOS TECH CO LTD
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