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Method for producing phosphoric acid by using 93%-98% concentrated sulfuric acid to extract phosphate rock and its equipment

A 93%-98%, concentrated sulfuric acid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low extraction rate, complex process, high cost, improve extraction rate, flexible process control, The effect of easy equipment

Inactive Publication Date: 2003-12-10
EAST CHINA ENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The traditional process has the disadvantages of complex process, high cost, low extraction rate and high energy consumption

Method used

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  • Method for producing phosphoric acid by using 93%-98% concentrated sulfuric acid to extract phosphate rock and its equipment
  • Method for producing phosphoric acid by using 93%-98% concentrated sulfuric acid to extract phosphate rock and its equipment

Examples

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Comparison scheme
Effect test

example 1

[0037] 60,000 tons / year P using the present invention 2 O 5 Phosphoric acid extraction device

[0038] See attached picture.

[0039] An equipment for producing phosphoric acid by extracting phosphate rock with 93%-98% concentrated sulfuric acid, including two equal-volume reaction tanks 1, 2, 1#reaction tank 1, 2#reaction tank 2, and the structure is a vertical circular storage tank , Its effective volume is 2.0~2.5m 3 / tpdP 2 O 5 , 1#reaction tank 1, 2#reaction tank 2 are respectively installed with a large circulating central stirring paddle 3, 4, and 4 sulfuric acid distributors 5 and 4 surface coolers 6, 2 are installed around the center stirring paddles 3, 4 respectively # Reaction tank is connected with slurry pump 8 and chute 7. 1# reaction tank 1 has an overflow pipe leading to 2# reaction tank 2.

[0040] The technological process and parameters are:

[0041] A method for producing phosphoric acid by extracting phosphate rock with 93%-98% concentrated sulfuric acid. The ...

example 2

[0043] 120,000 tons / year P using the present invention 2 O 5 Phosphoric acid extraction device

[0044] See attached picture. The device structure is the same as in Example 1.

[0045] The process flow is:

[0046] The raw material 93%-98% concentrated sulfuric acid is added into 1# reaction tank and 2# reaction tank, the effective size of 1# reaction tank and 2# reaction tank according to 8: 2 (wt) and phosphate rock slurry according to 7: 3 (wt) All are Φ11000×6900, with a total effective volume of 1083m 3 , The residence time of the reaction slurry is 4.75 hours, the power of the central stirring paddle motor is 185kW, the 1# reaction tank and the 2# reaction tank are equipped with 6 sulfuric acid distributors and 6 surface coolers. 1# Reaction tank temperature 85℃, P 2 O 5 Concentration 22~23%wt, liquid-solid ratio 3.0:1, stirring power 0.275kW / m 3 ; 2# reaction tank temperature 72℃, P 2 O 5 Concentration 23-24%wt, liquid-solid ratio 2.5:1, stirring power 0.285kW / m 3 , P 2 O 5...

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Abstract

The present invention provides a method for producing phosphoric acid by using 93%-98% concentrated sulfuric acid to extract phosphorus ore and its equipment. The sulfuric acid and phosphorus ore pulp are respectively added into two series-connected cylindrical reactor tanks with identical volume, according to a certain proportion, every reactor tank is equipped with several sulfuric acid distributors, surface cooling device and central stirring poddle with large circulation quantity, and the extraction reaction can be implemented in two reactor-tanks at the same time, and the operation condition of every reactor tank can be respectively controlled. Said invention can effectively raise extraction rate of P2O5, improve dihydrated calcium sulfate crystal and can raise filtering strength.

Description

Technical field [0001] The invention relates to a production process and equipment for phosphoric acid, and more specifically to an extraction technology and equipment for dihydrate wet-process phosphoric acid. Background technique [0002] The production of wet-process phosphoric acid is accomplished by decomposing phosphate rock with inorganic acid (mainly sulfuric acid). Wet-process phosphoric acid is an important raw material for phosphate fertilizer production, mainly used to produce phosphate compound fertilizer products. Wet-process phosphoric acid can also be processed to produce various phosphate products, or to produce food-grade phosphoric acid. [0003] The main chemical composition of phosphate rock is fluorapatite Ca 10 (PO 4 ) 6 F 2 CaCO 3 When it reacts with sulfuric acid, it produces phosphoric acid and insoluble calcium sulfate crystals. The main chemical reactions are as follows: <chemistry num="001"> <chem file="03131935_cml001.xml" / > < / chemis...

Claims

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Application Information

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IPC IPC(8): C01B25/222C01B25/46
Inventor 吴大农胡文生洪金武喻军徐新源张林
Owner EAST CHINA ENG SCI & TECH
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