Method for producing potassium phosphate from phosphoric acid and potassium chloride

A technology of potassium phosphate and potassium chloride, which is applied in the field of phosphorus chemical industry, can solve problems such as incomplete removal of chloride ions, and achieve the effect of improving economic efficiency

Inactive Publication Date: 2020-09-15
YIBIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of the invention is simple, the dechlorination efficiency is high, and the disadvantage of incomplete removal of chloride ions in the existing method is overcome

Method used

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  • Method for producing potassium phosphate from phosphoric acid and potassium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Add 100kg of industrial potassium chloride (98.28% KCl content) and 350kg of water produced by a mining company in Qinghai into a raw material dissolving tank, raise the temperature to 85°C and stir for 1 hour to completely dissolve potassium chloride, and separate it by filtration After removing the insoluble matter, transfer the potassium chloride solution into the mixing tank, and weigh 155kg of thermal phosphoric acid (H 3 PO 4 Content 85%) into the mixing tank, keep the temperature not lower than 80 ℃ and stir for 2 hours. At the same time, open the natural gas and air valves of the hot blast stove, and gradually open and adjust the natural gas and air valves after confirming that the ignition is successful, so that the temperature of the hot air entering the roaster from the hot blast stove is 550~600°C.

[0015] Mix the phosphoric acid and potassium chloride mixture evenly and transfer it to the preheater, heat it with the exhaust gas of the roaster t...

Embodiment 2

[0016] Example 2: Add 100kg of industrial potassium chloride (KCl content 98.46%) imported from Canada and 350kg of water into the raw material dissolving tank, raise the temperature to 85°C and stir for 1 hour to completely dissolve potassium chloride, and filter and separate the insoluble matter therein Finally, potassium chloride solution is transferred in the mixing tank, and 94kg thermal phosphoric acid (H 3 PO 4 Content 85%) into the mixing tank, keep the temperature not lower than 80 ℃ and stir for 2 hours. At the same time, open the natural gas and air valves of the hot blast stove, and gradually open and adjust the natural gas and air valves after confirming that the ignition is successful, so that the temperature of the hot air entering the roaster from the hot blast stove is 450~500°C.

[0017] Mix the phosphoric acid and potassium chloride mixture evenly and transfer it to the preheater, heat it with the exhaust gas of the roaster to above 120°C, and then inject i...

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Abstract

The invention relates to a method for preparing potassium phosphate. The method specifically comprises the following steps of: taking phosphoric acid and potassium chloride as raw materials, fully dissolving and mixing the phosphoric acid and the potassium chloride, feeding into a special roasting furnace, spraying the mixed solution of the phosphoric acid and the potassium chloride into the furnace from a spray gun at the top of the roasting furnace, and performing countercurrent mixing with high-temperature gas entering from the bottom of the roasting furnace; discharging hydrogen chloride generated by a reaction of the phosphoric acid and potassium chloride mixed solution at high temperature along with tail gas, and carrying out water washing to obtain finished hydrochloric acid; carrying out a dehydration reaction on the potassium phosphate to generate poly potassium phosphate, discharging the solid granular poly potassium phosphate from the bottom of the roasting furnace, dissolving by hot water, and adjusting the pH value by H3PO4 or KOH; and finally crystallizing, filtering, washing, and drying to obtain the finished product potassium phosphate.

Description

technical field [0001] The invention relates to a production method of potassium phosphate salt, which belongs to the field of phosphorus chemical industry. Specifically, phosphoric acid and potassium chloride are used as raw materials. After fully dissolving and mixing, the two are sent to a special roaster and mixed with the high-temperature gas entering from the bottom of the roaster; The hydrogen chloride generated in the following reaction is discharged with the tail gas and washed with water to obtain the finished product hydrochloric acid, and the potassium phosphate salt undergoes dehydration reaction to generate polymerized potassium phosphate salt. 3 PO 4 Or KOH to adjust its pH value, and finally after crystallization, filtration, washing and drying, the finished potassium phosphate salt can be obtained. Background technique [0002] Potassium phosphate, as one of the important products of the phosphate industry, is widely used in chemical, agricultural, industr...

Claims

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Application Information

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IPC IPC(8): C01B25/30C01B25/41
CPCC01B25/301C01B25/41
Inventor 邓科唐红梅
Owner YIBIN UNIV
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