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Semi-hydrated-two-hydrated wet process phosphoric acid production process and system thereof

A wet-process phosphoric acid and production process technology, applied in the field of phosphoric acid production process and its system, can solve the problems of wastewater discharge polluting the environment, small-scale equipment, high energy consumption, etc., and achieve environmental friendliness, low equipment investment and operating costs, and energy efficiency. The effect of low consumption

Active Publication Date: 2015-11-11
WUHUAN ENG
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Problems solved by technology

[0007] At present, there is only one set of imported 70,000 tons / year P 2 o 5 Hemihydrate-dihydrate phosphoric acid plant, which requires dry ore, circular reaction tank, belt filter, and the temperature of the filter slurry in the device is very high. Many equipment needs to be imported, resulting in high investment, small scale of the device, and high energy consumption , waste water discharge and environmental pollution, it is not suitable for the development requirements of contemporary phosphorus chemical industry,

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  • Semi-hydrated-two-hydrated wet process phosphoric acid production process and system thereof
  • Semi-hydrated-two-hydrated wet process phosphoric acid production process and system thereof
  • Semi-hydrated-two-hydrated wet process phosphoric acid production process and system thereof

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Embodiment Construction

[0040] The system of the present invention will be further explained below in conjunction with the accompanying drawings:

[0041] The system of the present invention comprises water reaction and filter system and dihydric reaction and filter system,

[0042] Described semi-aqueous reaction and filter system comprise that be provided with stirrer 6 dissolving tanks 1 (the present embodiment is 4 in series), crystallization tank 2, the first high position flash cooler 5, filter feeding tank 4, that are connected successively Semi-water filter 9 (for the rotary table filter) and the lower air tray 10, the outlet of the crystallization tank 2 is also connected to the dissolution tank 1 through the aging tank 3, and the semi-water filter 9 is provided with an initial stage from front to back. Filtering area 9.1, filtering area 9.2, first washing area 9.3 and filter cloth washing area 9.4, the lower air disc 10 is provided with the primary filtering area 9.1, filtering area 9.2, T...

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Abstract

The invention relates to a semi-hydrated-two-hydrated method wet process phosphoric acid production process and a system thereof, which solve the problems of high investment, small device scale, high energy consumption, low device operation rate and low raw material yield of the existing processing process. The technical solution comprises: performing semi-hydrated reaction and filtering by taking phosphorite as a raw material to obtain a product phosphoric acid and semi-hydrated gypsum, and then performing two-hydrated reaction and filtering on the semi-hydrated gypsum to obtain water-hydrated dry gypsum. The system comprises a semi-hydrated reaction and filtering system and a two-hydrated reaction and filtering system. The process is reliable, product phosphoric acid concentration is high, quality of side products fluosilicic acid and dry gypsum is good, energy consumption is low, equipment investment and operation cost are low, and environment friendliness and continuous stable large-scale production (more than or equal to 0.3 million tons / year) are realized.

Description

technical field [0001] The invention relates to a phosphoric acid production process and its system, in particular to a semi-water-dihydrate wet-process phosphoric acid production process and its system. Background technique [0002] Phosphoric acid is an important chemical raw material, mainly used in the production of phosphate compound fertilizer products. After deep processing, it can also produce various phosphate products, or produce food-grade and electronic-grade phosphoric acid. Using sulfuric acid to decompose phosphate rock to produce phosphoric acid is the basic method of wet process phosphoric acid. [0003] The main chemical component in phosphate rock is Ca 5 F(PO 4 ) 3 , when it reacts with sulfuric acid, phosphoric acid and insoluble calcium sulfate crystals are generated. Its chemical reaction formula is as follows: [0004] Ca 5 F(PO 4 ) 3 +5H 2 SO 4 +mH 2 O=3H 3 PO 4 +5CaSO4 m / 5H2O↓+HF↑ [0005] When the reaction temperature, the amount of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/229
Inventor 赵军郭国清李志刚杨培发严龙
Owner WUHUAN ENG
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