Production method of acidic potassium thiophosphate

Abstract

The invention belongs to the technical field of phosphate production in the industry of inorganic chemistry and particularly relates to a production method of acidic potassium thiophosphate. The technical scheme of the invention for solving the technical problems is providing the production method of acidic potassium thiophosphate. The method comprises the following steps: slurrying potassium chloride and water; sequentially adding sulfuric acid and phosphoric acid into the obtained slurry for reactions; and drying the reaction slurry obtained by the reactions to obtain a product of acidic potassium thiophosphate. The method provided by the invention can be used for preparing a high-phosphorous high-potassium compound with good water solubility and high acidity; the defects of easy moisture absorption and easy caking of the products obtained through simple physical mixing of wet-process phosphoric acid and a raw material potassium sulfate in the prior art are solved; and the method has a perfect market prospect.

Description

technical field

[0001] The invention belongs to the technical field of phosphate production in the inorganic chemical industry, in particular to a production method of acid potassium thiophosphate. Background technique

[0002] Potassium acid thiophosphate, its molecular structure is: KH 2 PO 4 ·KHSO 4 ·H 3 PO 4 , and its pH value is around 2.0. There are few related reports and studies.

[0003] Due to the high phosphorus and potassium content, good water solubility and high acidity of acid potassium thiophosphate products, it is suitable for cotton planting with drip irrigation technology in dry saline-alkali land in Northwest China. When used at the peak of potassium absorption, it can promote early maturity, increase boll weight, and improve cotton quality. During use, the acid potassium thiophosphate fertilizer can be dissolved in water, and then sent to the place where fertilization is required through the drip irrigation pipe, which is very convenient to use. ...

Examples

Embodiment 1

[0042] Weigh 100kg of potassium chloride, add it to 60kg of water, start stirring, disperse evenly, heat to 60°C, and then follow the P 2 o 5 / K 2 O mass ratio is the ratio calculation of 1.0 Take wet-process phosphoric acid 149kg, join in the potassium chloride slurry that stirs, then according to H 2 SO 4 / K 2 O mol ratio is that the ratio calculation of 0.86 takes by weighing the concentrated sulfuric acid 69.2kg, reacts 3 hours;

[0043] Add the slurry to the dryer for atomization and drying, control the inlet temperature of the dryer to 230-270°C, and the outlet temperature to 110-130°C to obtain a powdery final product. Product indicators are shown in Table 4.

Embodiment 2

[0045] Weigh 100kg of potassium chloride, add it to 70kg of water, start stirring, disperse evenly, heat to 90°C, and then follow the P 2 o 5 / K 2 O mass ratio is that the ratio calculation of 1.2 takes wet-process phosphoric acid 179kg, joins in the potassium chloride slurry that stirs, then according to H 2 SO 4 / K 2 O molar ratio is that the ratio calculation of 0.5 takes by weighing the vitriol oil 40kg, reacts 2 hours;

[0046] Put the slurry into the dryer for atomization and drying, control the inlet temperature of the dryer to 280-300°C, and the outlet temperature to 100-110°C to obtain a powdery final product. Product indicators are shown in Table 4.

Embodiment 3

[0048] Weigh 100kg of potassium chloride, add it to 90kg of water, start stirring, disperse evenly, heat to 80°C, and then follow the P 2 o 5 / K 2 O mass ratio is the ratio calculation of 0.8 Take wet-process phosphoric acid 119kg, join in the potassium chloride slurry that stirs, then according to H 2 SO 4 / K 2 O molar ratio is that the ratio calculation of 0.7 takes by weighing the vitriol oil 56kg, reacts 4 hours;

[0049] Add the slurry to the dryer for atomization and drying, control the inlet temperature of the dryer to 320-350°C, and the outlet temperature to 90-100°C to obtain a powdery final product. Product indicators are shown in Table 4.

[0050] Table 2 Product Index

[0051]

[0052]

[0053] The method for measuring the acidity is: take 1 g of the sample, dissolve it in 100 ml of water, titrate it with 0.5 mol / L NaOH solution to a pH value of 6.5, and the volume of lye consumed is the acidity of the product. This can more intuitively reflect the abi...

technical field

[0001] The invention belongs to the technical field of phosphate production in the inorganic chemical industry, in particular to a production method of acid potassium thiophosphate. Background technique

[0002] Potassium acid thiophosphate, its molecular structure is: KH 2 PO 4 ·KHSO 4 ·H 3 PO 4 , and its pH value is around 2.0. There are few related reports and studies.

[0003] Due to the high phosphorus and potassium content, good water solubility and high acidity of acid potassium thiophosphate products, it is suitable for cotton planting with drip irrigation technology in dry saline-alkali land in Northwest China. When used at the peak of potassium absorption, it can promote early maturity, increase boll weight, and improve cotton quality. During use, the acid potassium thiophosphate fertilizer can be dissolved in water, and then sent to the place where fertilization is required through the drip irrigation pipe, which is very convenient to use. ...

Examples

Embodiment 1

[0042] Weigh 100kg of potassium chloride, add it to 60kg of water, start stirring, disperse evenly, heat to 60°C, and then follow the P 2 o 5 / K 2 O mass ratio is the ratio calculation of 1.0 Take wet-process phosphoric acid 149kg, join in the potassium chloride slurry that stirs, then according to H 2 SO 4 / K 2 O mol ratio is that the ratio calculation of 0.86 takes by weighing the concentrated sulfuric acid 69.2kg, reacts 3 hours;

[0043] Add the slurry to the dryer for atomization and drying, control the inlet temperature of the dryer to 230-270°C, and the outlet temperature to 110-130°C to obtain a powdery final product. Product indicators are shown in Table 4.

Embodiment 2

[0045] Weigh 100kg of potassium chloride, add it to 70kg of water, start stirring, disperse evenly, heat to 90°C, and then follow the P 2 o 5 / K 2 O mass ratio is that the ratio calculation of 1.2 takes wet-process phosphoric acid 179kg, joins in the potassium chloride slurry that stirs, then according to H 2 SO 4 / K 2 O molar ratio is that the ratio calculation of 0.5 takes by weighing the vitriol oil 40kg, reacts 2 hours;

[0046] Put the slurry into the dryer for atomization and drying, control the inlet temperature of the dryer to 280-300°C, and the outlet temperature to 100-110°C to obtain a powdery final product. Product indicators are shown in Table 4.

Embodiment 3

[0048] Weigh 100kg of potassium chloride, add it to 90kg of water, start stirring, disperse evenly, heat to 80°C, and then follow the P 2 o 5 / K 2 O mass ratio is the ratio calculation of 0.8 Take wet-process phosphoric acid 119kg, join in the potassium chloride slurry that stirs, then according to H 2 SO 4 / K 2 O molar ratio is that the ratio calculation of 0.7 takes by weighing the vitriol oil 56kg, reacts 4 hours;

[0049] Add the slurry to the dryer for atomization and drying, control the inlet temperature of the dryer to 320-350°C, and the outlet temperature to 90-100°C to obtain a powdery final product. Product indicators are shown in Table 4.

[0050] Table 2 Product Index

[0051]

[0052]

[0053] The method for measuring the acidity is: take 1 g of the sample, dissolve it in 100 ml of water, titrate it with 0.5 mol / L NaOH solution to a pH value of 6.5, and the volume of lye consumed is the acidity of the product. This can more intuitively reflect the abi...

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