Process for producing potassium phosphate with wet phosphoric acid

A technology of wet-process phosphoric acid and potassium phosphate salt, which is applied in the fields of phosphorus compounds, chemical instruments and methods, and inorganic chemistry. It can solve the problems of complex operation, large equipment investment, and high purification cost, and achieve low purity, low concentration, and easy removal. Effect

Inactive Publication Date: 2010-06-30
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing wet-process phosphoric acid purification methods such as solvent extraction, ion exchange, and ele

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Wet-process phosphoric acid, lead ore and Repone K react to produce potassium phosphate technology, and it comprises the steps:

[0021] ①Obtained by the determination of which P 2 o 5 Content is the wet-process phosphoric acid of 14.72% (mass percentage), by wet-process phosphoric acid, lead in lead ore, potassium chloride (industrial grade) molar ratio is 2: 1: 2 feeding, mixed liquid is put into ultrasonic reactor, At a temperature of 34-40°C, take it out after 40 minutes of reaction, cool to room temperature and filter off the precipitate, add potassium hydroxide to adjust the pH=4.59, and generate Al(OH) 3 and CaHPO 4 The insoluble precipitate was filtered off.

[0022] ② The filtrate is evaporated and crystallized. After the solution reaches saturation, the crystals are separated at a temperature of 40° C. to obtain potassium phosphate salt, and the mother liquor is returned to the filtrate obtained by filtration for reuse.

[0023] The potassium phosphate pr...

Embodiment 2

[0025] Wet-process phosphoric acid, waste lead plaster and Repone K react to produce potassium phosphate salt technology, and it comprises the steps:

[0026] ①Obtained by the determination of which P 2 o 5 Content is the wet-process phosphoric acid of 10.54% (mass percentage), according to the molar ratio of wet-process phosphoric acid, lead in the waste lead plaster, potassium chloride (industrial grade) is 2: 1: 2 feeding, the mixed liquid is put into ultrasonic reactor , at a temperature of 2-4°C, take it out after reacting for 40 minutes, cool to room temperature and filter off the precipitate. Add potassium hydroxide to adjust pH=4.23 to produce Al(OH) 3 and CaHPO 4 The insoluble precipitate was filtered off.

[0027] ② The filtrate is evaporated and crystallized. After the solution reached saturation, the crystals were separated at a temperature of 40° C. to obtain potassium phosphate salt. The mother liquor is returned to the filtered filtrate for reuse.

[0028...

Embodiment 3

[0030] Wet-process phosphoric acid, lead oxide or lead dioxide react with potassium chloride to produce potassium phosphate salt process, and it comprises the steps:

[0031] ①Obtained by the determination of which P 2 o 5 The content is 14.72% (mass percentage) of wet-process phosphoric acid, according to the molar ratio of wet-process phosphoric acid, lead in lead oxide, potassium chloride (industrial grade) is 2: 1: 1.8 feeding, the mixed liquid is put into ultrasonic reactor , at a temperature of 26-30°C, take it out after reacting for 60 minutes, cool to room temperature and filter off the precipitate. Add potassium hydroxide to adjust pH=4.23 to produce Al(OH) 3 and CaHPO 4 The insoluble precipitate was filtered off.

[0032] ② The filtrate is evaporated and crystallized. After the solution reached saturation, the crystals were separated at a temperature of 40° C. to obtain potassium phosphate salt. The mother liquor is returned to the filtered filtrate for reuse. ...

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Abstract

The invention relates to a process for producing potassium phosphate with wet phosphoric acid. The process comprises the following steps that: 1) wet phosphoric acid is put into an ultrasonic reactor for ultrasonication at the temperature of 2-80 degree centigrade with the reaction time of 10-120 minutes; then the product is cooled to be at room temperature and precipitates are leached, thus obtaining a filter liquor; 2) potassium hydroxide, potassium carbonate or potassium bicarbonate is used to regulate the PH value of the filter liquor and generate precipitates, and a new filter liquor obtained after filtering is concentrated, evaporated, crystallized and then separated, thus obtaining potassium phosphate. The process is characterized in that wet phosphoric acid with low purity, purity and cost, lead-bearing material and potassium chloride are used as raw materials to react and generate potassium phosphate, which reduces production cost. Impurities in the raw materials interact and generate insoluble precipitates, and the insoluble precipitates can be easily separated. In the simple process, products are generated only by concentrating and crystallizing a neutralizer; potassium phosphate is directly prepared by utilizing phosphoric acid with the concentration of 5-40%, which solves the problems of low consistency of wet phosphoric acid and high energy consumption for concentration.

Description

technical field [0001] The invention relates to a process for producing potassium phosphate salt with wet-process phosphoric acid. Background technique [0002] Potassium phosphate in China is usually produced by neutralization, concentration and crystallization of thermal phosphoric acid or refined phosphoric acid and potassium hydroxide or potassium carbonate, and the production cost is relatively high. Wet-process phosphoric acid and potassium chloride with lower production costs are used instead of hot-process phosphoric acid to produce potassium phosphate, and wet-process phosphoric acid must be pretreated. Existing wet-process phosphoric acid purification methods such as solvent extraction, ion exchange, and electrodialysis have disadvantages: large equipment investment; complicated operation; and high purification costs. Contents of the invention [0003] The problem to be solved by the present invention is to propose a kind of technology that uses wet-process phos...

Claims

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Application Information

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IPC IPC(8): C01B25/30
Inventor 熊祥祖李志保张林锋魏世辕李文歆王威
Owner WUHAN INSTITUTE OF TECHNOLOGY
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