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Hemi-hydrate process wet process phosphoric acid production process

A wet-process phosphoric acid and production process technology, applied in the field of phosphoric acid, can solve problems such as aggravation of equipment corrosion, and achieve the effects of high energy consumption and cost reduction

Active Publication Date: 2013-10-02
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies of the prior art, to provide a semi-aqueous wet-process phosphoric acid production process, using phosphoric acid to extract phosphate rock by increasing the liquid-solid ratio and controlling the phosphoric acid concentration to increase the conversion rate of phosphorus, while solving the problem of temperature rise The problem of increased corrosion of equipment caused by

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take by weighing 100 grams of phosphate rock, and pass through a 100 mesh sieve through a disk mill to 60% of the phosphate rock powder, and its composition is: P 2 o 5 30% CaO 48% MgO 1.3% F 2.9% SiO 2 8% sesquioxide 2.4%;

[0016] Prepare 1100 grams of phosphoric acid solution with a concentration of 50%, add it to a reactor with a capacity of 1000ML, heat and stir with a constant temperature heating device (the temperature is set at 85°C) and stir at a speed of 210rmp, when the temperature reaches 80°C, add the above-mentioned phosphate rock powder , reacted for 60 minutes, and stopped for 60 minutes after the end of the reaction.

[0017] Slowly add sulfuric acid with a concentration of 93% into the above-mentioned reaction slurry, and control the sulfuric acid addition time to be 30. After the addition is complete, continue the reaction for 30 minutes to end.

[0018] Filter the slurry produced by the reaction quickly with a filter, and add hot water ...

Embodiment 2

[0021] Take by weighing 200 grams of phosphate rock, and pass through a 100-mesh sieve through disc mill grinding to 60% phosphate rock powder, and its composition is: P 2 o 5 30% CaO 48% MgO 1.3% F 2.9% SiO 2 8% sesquioxide 2.4%;

[0022] Prepare 2200 grams of phosphoric acid solution with a concentration of 50%, add it to a reactor with a capacity of 2000ML, heat and stir with a constant temperature heating device (the temperature is set at 85°C) and stir at a speed of 210rmp, when the temperature reaches 80°C, add the above-mentioned phosphate rock powder , reacted for 60 minutes, and stopped for 60 minutes after the end of the reaction.

[0023] Slowly add sulfuric acid with a concentration of 93% into the above-mentioned reaction slurry, and control the sulfuric acid addition time to be 30. After the addition is complete, continue the reaction for 30 minutes to end.

[0024] Filter the slurry produced by the reaction quickly with a filter, and add hot wat...

Embodiment 3

[0027] Take by weighing 100 grams of phosphate rock, and pass through a 100-mesh sieve through disc mill grinding to 60% phosphate rock powder, and its composition is: P 2 o 5 30% CaO 48% MgO 1.3% F 2.9% SiO 2 8% sesquioxide 2.4%;

[0028] Prepare 1100 grams of phosphoric acid solution with a concentration of 55%, add it to a reactor with a capacity of 1000ML, heat and stir with a constant temperature heating device (the temperature is set at 80°C) and stir at a speed of 210rmp, when the temperature reaches 80°C, add the above-mentioned phosphate rock powder , reacted for 90 minutes, and stopped for 60 minutes after the end of the reaction.

[0029] Slowly add sulfuric acid with a concentration of 93% into the above-mentioned reaction slurry, and control the sulfuric acid addition time to be 30. After the addition is complete, continue the reaction for 30 minutes to end.

[0030] Filter the slurry produced by the reaction quickly with a filter, and add hot water ...

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Abstract

The invention discloses a hemi-hydrate process wet process phosphoric acid production process which comprises the following steps of: 1) crushing commercial-grade phosphate ore to be 60% ground phosphate rock and screening by using a sieve of 100 meshes; 2) adding the crushed phosphate ore into phosphoric acid which is 50-55% in mass concentration, controlling the liquid-solid ratio to be 12:1 and the reaction temperature to be 60-80 DEG C, carrying out decomposition reaction for 60-90 minutes; 3) adding reaction slurry into concentrated sulfuric acid (93-98%) to carry out rapid chemical reaction to generate hemi-hydrate gypsum and phosphoric acid; 4) filtering the generated hemi-hydrate gypsum by using a filtering machine, washing by using hot water, drying and grinding so as to obtain a product hemi-hydrate building gypsum powder; 5) using the filtrate obtained through filtration as another objective product, i.e., the wet process phosphoric acid. By using the process, the problem that the hemi-hydrate gypsum is hard to filter and wash is solved, and moreover the cost on ardealite resource application is greatly lowered.

Description

technical field [0001] The present invention relates to phosphoric acid, specifically, is a kind of semi-aqueous wet-process phosphoric acid production process. Background technique [0002] The traditional semi-aqueous wet-process phosphoric acid production process realizes the semi-aqueous wet-process phosphoric acid process through measures such as increasing the reaction temperature and controlling the shortage of sulfuric acid. There are problems such as high reaction temperature, increased corrosion, and large investment in equipment. The extraction rate and the washing rate are low, leading to the problem of large phosphorus loss. Contents of the invention [0003] The purpose of the present invention is to address the deficiencies of the prior art, to provide a semi-aqueous wet-process phosphoric acid production process, using phosphoric acid to extract phosphate rock by increasing the liquid-solid ratio and controlling the phosphoric acid concentration to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/18C01F11/46
Inventor 胡厚美
Owner WENGFU (GRP) CO LTD
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