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Method for improving property of dihydrate wet-process phosphoric acid reaction slurry

A technology of wet-process phosphoric acid and reaction materials, which is applied in the direction of phosphoric acid, phosphorus oxyacids, chemical instruments and methods, etc., which can solve the problem of equipment production capacity, washing rate, phosphorus pentoxide recovery rate, and affecting reaction slurry filtration and washing performance , finely crushed phosphogypsum crystals, etc., to improve filtration and washing performance, increase filtration strength and device capacity, and increase filtration strength

Inactive Publication Date: 2005-09-21
云南云天化国际化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the depletion of phosphate rock resources, the grade of phosphate rock used for wet-process phosphoric acid production (characterized by P 2 o 5 ), the quality (representing impurities) declines, resulting in finely crushed phosphogypsum crystals. When filtering, the gaps in the filter cloth and filter cake are blocked, which seriously affects the filtration and washing performance of the reaction slurry, resulting in the production capacity, washing rate, and phosphorus pentoxide of the device. The recovery rate drops and the consumption increases, seriously restricting the improvement of economic benefits

Method used

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  • Method for improving property of dihydrate wet-process phosphoric acid reaction slurry

Examples

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Embodiment 1

[0025] In Yunnan Sanhuan Chemical Co., Ltd. 70kt P 2 o 5 / a On the dihydrate wet-process phosphoric acid production unit, the cyclone is used to classify the reaction slurry. Then the phosphogypsum crystal particle size is 91% of +40um particles, 54% of +100um particles, 22% of +150um particles, and the graded underflow with a solid concentration of 43% is sent to the filter for filtration and wash.

[0026] The contained phosphogypsum crystal grain size is -40um particle proportion rate is 82%, -100um particle proportion rate is 100%, the graded overflow with solid concentration of 30% is sent back to the reaction tank, and the finely divided particles contained in the graded overflow Phosphogypsum crystals are used as seeds to further grow and increase in the reaction tank.

[0027] The filtered and washed phosphogypsum is sent to the slag yard, the dilute phosphoric acid is sent to the storage tank, and the primary filtrate and a washing liquid are returned to the reacti...

Embodiment 2

[0030] Except that described grading equipment adopts inclined plate classifier, other production process is identical with embodiment 1.

Embodiment 3

[0032] Repeat Example 1, with the following differences: the contained phosphogypsum crystal grain size is 95% of +40um particles, 65% of +100um particles, and 35% of +150um particles, and the solid concentration is 50% % of the graded underflow is sent to the filter for filtration and washing. Send the phosphogypsum crystalline particle size of -40um particles to 85%, the proportion of -100um particles to 100%, and the grading overflow with a solid concentration of 20% to be sent back to the reaction tank. Phosphogypsum crystals are used as seeds to further grow and increase in the reaction tank. Comprehensive effect of implementation: the filtration strength of the reaction slurry is increased by 16.8%, and the washing rate is increased by 0.65%.

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Abstract

The invention discloses a method for improving the performance of dihydrate wet methods phosphoric acid reaction stuff, which comprises the following steps: Classify treating the stuffs by a classifier, the ardealite crystal size of classification bottom current is: the proportion of particles of +40 um size is 90%-95%, 100 um size is 50%-65%, +150 um size is 20%-35%. Filtering and washing the classification bottom current in a filter. The ardealite crystal size of classification overflow is: the proportion of particles of -40 um size is 80%-85%, -100 um size is 100%. Growing and increasing further have the classification overflow in a seed crystal reaction tank and entering the next classified cycle. Taking the ardealite filtrated and washed to the slag ground, and taking the diluted phosphoric acid to the storage tank, returning the preliminary filter liquid and 1st cleaning solution to the reaction tank, and quadratic countercurrent washing the 2nd cleaning solution in the filter.

Description

technical field [0001] The present invention relates to the production method of dihydrate wet-process phosphoric acid, more specifically, the present invention relates to the improvement of the filtration and washing process in the production of dihydrate wet-process phosphoric acid. Background technique [0002] The production of wet-process phosphoric acid mainly includes four processes: dihydrate, hemihydrate, hemihydrate-dihydrate recrystallization, and dihydrate-half water recrystallization. At present, the dihydrate process is dominant in the world. But no matter which process is used, the production of wet-process phosphoric acid needs to obtain coarse and neat phosphogypsum crystals, so as to improve the filtration and washing performance of the reaction slurry. premise of benefit. [0003] In the existing dihydrate wet-process phosphoric acid production technology, the reaction slurry is directly filtered into the filter, and then added ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/22C01B25/225
Inventor 明大增杨建中资学民孙文忠许龙翔白正斌胡本明
Owner 云南云天化国际化工有限公司
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