Wet phosphoric acid production process through ceramic membrane method

A production process, wet-process phosphoric acid technology, applied in the direction of phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of complex structure of phosphoric acid settling tank, frequent slag discharge, etc., achieve excellent phosphoric acid corrosion resistance and shorten processing time , The effect of shortening the production process

Active Publication Date: 2015-08-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is more frequent for slagging, and due to the introduction of thickeners and settlers, the structure of the phosphoric acid settling tank is complicated

Method used

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  • Wet phosphoric acid production process through ceramic membrane method
  • Wet phosphoric acid production process through ceramic membrane method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The concentration of crude phosphoric acid after filtration in a phosphoric acid production plant is 25%wtP 2 O 5 , The solid content is 0.3wt%, and the ceramic membrane separation system is used for processing (the feed pump of the ceramic membrane separation system is an acid-resistant centrifugal pump; the material of the flow part is polyperfluoroethylene propylene). Under the conditions of a temperature of 20℃, an operating pressure of 0.2MPa, and a cross-flow velocity of 3m / s, through ZrO with a pore diameter of 50nm 2 The ceramic membrane is concentrated 18 times, the yield of phosphoric acid is 96%, and the permeate flux is 160L·m -2 ·H -1 Above, the obtained dilute phosphoric acid is clear and transparent, with a solid content of 0 wt%.

Embodiment 2

[0027] The concentration of crude phosphoric acid after filtration in a phosphoric acid production plant is 30%wtP 2 O 5 , The solid content is 0.75wt%, and the ceramic membrane separation system is used for processing (the feed pump of the ceramic membrane separation system is an acid-resistant centrifugal pump; the flow-through component material is polyperfluoroethylene propylene). Under the conditions of a temperature of 25°C, an operating pressure of 0.15MPa, and a cross-flow velocity of 3m / s, through ZrO with a pore size of 200nm 2 The ceramic membrane is concentrated 15 times, the yield of phosphoric acid is 96%, and the permeate flux is 180L·m -2 ·H -1 Above, the obtained dilute phosphoric acid is clear and transparent, with a solid content of 0 wt%.

Embodiment 3

[0029] The concentration of crude phosphoric acid after filtration in a phosphoric acid production plant is 20%wtP 2 O 5 , The solid content is 1.1wt%, and the ceramic membrane separation system is used for processing (the feed pump of the ceramic membrane separation system is an acid-resistant centrifugal pump; the material of the flow part is polyethylene). Under the conditions of a temperature of 30℃, an operating pressure of 0.15MPa, and a cross-flow velocity of 3m / s, through Al with a pore diameter of 500nm 2 O 3 The ceramic membrane is concentrated 12 times, the yield of phosphoric acid is 95%, and the permeate flux is 220L·m -2 ·H -1 Above, the obtained dilute phosphoric acid is clear and transparent, with a solid content of 0 wt%.

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Abstract

The invention relates to a wet phosphoric acid production process through a ceramic membrane method. The wet phosphoric acid production process is characterized in that crude phosphoric acid filtered by a filter is pumped into a ceramic membrane separation system to be filtered, so that suspended matter in the crude phosphoric acid is removed, and clarified and transparent diluted phosphoric acid is obtained; and a ceramic membrane concentrated solution returns into the filter to circulate and is discharged along with gypsum filter residues. Compared with a conventional wet phosphoric acid production process, the wet phosphoric acid production process provided by the invention has the characteristics that the crude phosphoric acid filtered by the filter is not aged and clarified and directly enters the ceramic membrane separation system to be filtered, and therefore, the technological process and the crude phosphoric acid processing time are shortened; furthermore, a flocculating agent is not needed in the treating process; and, after the crude phosphoric acid is filtered, the solid content in the crude phosphoric acid is reduced to 0.01 wt% and below. The wet phosphoric acid production process disclosed by the invention can effectively solve the technical problems of long technological process and crude phosphoric acid processing time and low suspended matter removing efficiency in the traditional wet phosphoric acid production process; simultaneously, the ceramic membrane separation system in the invention is simple in equipment and small in occupation area; and continuous operation can be realized.

Description

Technical field [0001] The invention relates to a phosphoric acid production process and a membrane separation technology, in particular to a ceramic membrane wet process phosphoric acid production process, belonging to the chemical industry. Background technique [0002] Phosphoric acid production methods mainly include wet-process phosphoric acid and thermal phosphoric acid, of which wet-process phosphoric acid production processes account for more than 90%. According to the different grades of phosphate rock and the fluctuation of production conditions, the concentration of crude phosphoric acid produced by wet-process phosphoric acid is 20wt%~30%wtP 2 O 5 between. [0003] The production process of wet-process phosphoric acid is as follows: Phosphate rock and sulfuric acid are reacted in the acidolysis reaction tank to generate phosphoric acid slurry. The slurry from the acidolysis reaction tank is pumped into a vacuum filter through a slurry pump for solid-liquid separation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/222
Inventor 邢卫红黄姗徐南平范益群
Owner NANJING UNIV OF TECH
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