Gradient technology method for wet process phosphoric acid production

A technology of wet-process phosphoric acid and process methods, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of long phosphoric acid leaching time, poor filtration effect, high residual phosphorus content of phosphogypsum, etc.

Active Publication Date: 2017-02-15
ANHUI LIUGUO CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of long phosphoric acid leaching time, high residual phosphorus content of phosphogypsum and poor fil

Method used

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  • Gradient technology method for wet process phosphoric acid production
  • Gradient technology method for wet process phosphoric acid production

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The chemical composition of Hubei Phosphate Rock A is as follows: P 2 o 5 Content 31.26%, CaO content 46.24% (Wt%).

[0036] The specific operation steps of the gradient process of wet-process phosphoric acid production are as follows:

[0037] There are three stages in acid hydrolysis and leaching of phosphate rock. The first stage is the rapid reaction stage, the second stage is the stable reaction stage, and the third stage is the solid crystal growth stage.

[0038] 1. Adjust the formula

[0039] According to the reaction characteristics of phosphate rock A, the ratio (molar ratio) of the phosphate rock and sulfuric acid that needs to be added twice is preferred, specifically as follows:

[0040] the first time the second time h 3 PO 4 :H 2 SO 4

1:0.7 0.2:1

[0041] 2. Rapid response stage

[0042] Add 40g of phosphate rock and 33g of high phosphorus mixed acid (phosphoric acid 19.41g, sulfuric acid 13.59g, the molar ratio of ...

Embodiment 2

[0053] The chemical composition of Hubei phosphate rock B is as follows: P 2 o 5 Content 30.18%, CaO content 44.51% (Wt%).

[0054] The specific operation steps of the gradient process of wet-process phosphoric acid production are as follows:

[0055] There are three stages in acid hydrolysis and leaching of phosphate rock. The first stage is the rapid reaction stage, the second stage is the stable reaction stage, and the third stage is the solid crystal growth stage.

[0056] 1. Adjust the formula

[0057] According to the reaction characteristics of phosphate rock B, the ratio (molar ratio) of the phosphate rock and sulfuric acid that needs to be added twice is optimized, specifically as follows:

[0058] the first time the second time h 3 PO 4 :H 2 SO 4

1:0.6 0.3:1

[0059] 2. Rapid response stage

[0060] Add 40g of phosphate rock and 31.91g of high phosphorus mixed acid (19.94g of phosphoric acid, 11.17g of sulfuric acid, the molar ...

Embodiment 3

[0071] The chemical composition of Hubei phosphate rock C is as follows: P 2 o 5 Content 30.02%, CaO content 43.90% (Wt%).

[0072] The specific operation steps of the gradient process of wet-process phosphoric acid production are as follows:

[0073] There are three stages in acid hydrolysis and leaching of phosphate rock. The first stage is the rapid reaction stage, the second stage is the stable reaction stage, and the third stage is the solid crystal growth stage.

[0074] 1. Adjust the formula

[0075] According to the reaction characteristics of phosphate rock C, the ratio (molar ratio) of the phosphate rock and sulfuric acid that needs to be added twice is preferred, specifically as follows:

[0076] the first time the second time h 3 PO 4 :H 2 SO 4

1:0.6 0.3:1

[0077] 2. Rapid response stage

[0078] Add 40g of phosphate rock and 31.33g of high phosphorus mixed acid (19.58g of phosphoric acid, 11.75g ​​of sulfuric acid, the mola...

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Abstract

The invention relates to a gradient technology method for wet process phosphoric acid production. Phosphate ore acidolysis digestion includes three stages, wherein the first stage is a quick reaction stage, the second stage is a stable reaction stage, and the third stage is a solid grain growing stage; in the quick reaction stage, hyperphosphate mixed acid solution of which the molar ratio of phosphoric acid to sulfuric acid is 1:0.5-1:1 is added; in the stable reaction stage, high-sulfur mixed acid solution of which the molar ratio of phosphoric acid to sulfuric acid is 0:1-0.5:1 is added; in the grain growing stage, the temperature of a crystallization tank is lowered, calcium sulphate dihydrate crystal in ardealite is accelerated to form particles with a large particle size; residual phosphorus content in the ardealite is smaller than 1.9%. According to the method, ground phosphate rock digestion time is shortened by 50%, the residual phosphorus content in the obtained ardealite can be lowered by 20% or more, and a filtering rate can be improved by 30% or more.

Description

technical field [0001] The invention belongs to the technical field of wet-process phosphoric acid leaching acid production technology, and in particular relates to a method for improving the quality of phosphogypsum in the wet-process phosphoric acid process. [0002] technical background [0003] The production methods of phosphoric acid mainly include thermal method and wet method. Compared with the thermal method phosphoric acid reduced by electric furnace, wet method phosphoric acid has obvious cost advantages and smaller environmental impact due to low energy consumption. Wet-process phosphoric acid uses inorganic acids, mainly crude phosphoric acid obtained by decomposing phosphate rock with sulfuric acid, and phosphogypsum with calcium sulfate as the main component. In the production process, the main method is one-step production of phosphoric acid. Although the acid hydrolysis rate is good, the acid hydrolysis time is long, the residual phosphorus content of the pr...

Claims

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Application Information

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IPC IPC(8): C01B25/225
CPCC01B25/225
Inventor 崔鹏郑凌志窦焰方羊孙祥斌沈浩刘荣郑之银彭克荣
Owner ANHUI LIUGUO CHEM CO LTD
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