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 complex process, low extraction rate, high energy consumption, flexible process control, and improved extraction rate. , the effect of compact device layout

Inactive Publication Date: 2005-12-28
EAST CHINA ENG SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0014] 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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Effect test

example 1

[0038] Adopt the 60,000 tons / year P of the present invention 2 o 5 Phosphoric acid extraction unit

[0039] See attached picture.

[0040] An equipment for producing phosphoric acid by extracting phosphate rock with 93%-98% concentrated sulfuric acid, including two equal-volume reaction tanks 1 and 2, 1# reaction tank 1 and 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 and 2# reaction tank 2 are respectively equipped with a central stirring paddle 3 and 4 with a large circulation capacity, and 4 sulfuric acid distributors 5 and 4 surface coolers 6 and 2 are respectively installed around the central stirring paddle 3 and 4 The #reaction tank is connected with the slurry pump 8 and the chute 7. The overflow pipe on the 1# reaction tank 1 leads to the 2# reaction tank 2.

[0041] Its technological process and parameters are:

[0042] A method of extracting phosphate rock with ...

example 2

[0044] Adopt 120,000 tons / year P of the present invention 2 o 5 Phosphoric acid extraction unit

[0045] See attached picture. The device structure is the same as Example 1.

[0046] Its technological process is:

[0047] Raw material 93%-98% concentrated sulfuric acid is added to 1# reaction tank and 2# reaction tank at 8:2 (wt), and phosphate rock slurry is added to 1# reaction tank and 2# reaction tank at 7:3 (wt), the effective size of 1# reaction tank and 2# reaction tank Both are Φ11000×6900, with a total effective volume of 1083m 3 , The residence time of the reaction slurry is 4.75 hours, the motor power of the central stirring paddle 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°C, 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°C, P 2 o 5 Concentration 23-24%wt, liquid-solid ra...

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Abstract

The present invention proposes a method and equipment for extracting phosphate rock with 93%-98% concentrated sulfuric acid to produce phosphoric acid. Sulfuric acid and phosphate rock pulp are respectively added to two series-connected cylindrical reaction tanks of equal volume according to a certain ratio. The reaction tank is equipped with several sulfuric acid distributors and surface coolers, as well as a single central stirring paddle with large circulation. The cold air passes over the surface of the slurry thrown by the surface cooler and the sulfuric acid distributor, and the cold air is heated and humidified, thereby taking away the water vapor and removing the heat of reaction. The extraction reaction is carried out in two reaction tanks at the same time, and the operating conditions of the two tanks can be controlled separately, which is more conducive to the decomposition of phosphate rock and the coarse crystallization; the sulfuric acid is easy to disperse and more uniform under the sprinkler of the sulfuric acid distributor, and will not produce local A lot of SO 4 2- excess. The invention has strong adaptability to phosphate rock and can effectively improve the P 2 o 5 Improve the extraction rate, improve the crystallization of calcium sulfate dihydrate, and improve the filtration strength.

Description

technical field [0001] The present invention relates to the production process and equipment of phosphoric acid, more specifically to an extraction technology and equipment of dihydric wet-process phosphoric acid. Background technique [0002] Wet-process phosphoric acid production is accomplished by decomposing phosphate rock with inorganic acids (mainly sulfuric acid). Wet-process phosphoric acid is an important raw material for the production of phosphate fertilizers, mainly used in the production of phosphate compound fertilizer products. Wet-process phosphoric acid can also be further 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, phosphoric acid and insoluble calcium sulfate crystals are generated, and its main chemical reaction is as follows: [0004] <chemistry num="001"> &l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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