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Purified wet-process technique for producing phosphoric acid and equipment thereof

A wet-process phosphoric acid and production process technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems that have not been seen in the industrialized production of purified wet-process phosphoric acid, large quality fluctuations, large consumption of raw materials, etc., to achieve Reduced volatilization area, reduced purification cost, and reduced consumption

Inactive Publication Date: 2006-10-25
WENGFU (GRP) CO LTD
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Problems solved by technology

[0003] However, the production capacity of this production process can only reach 1,000t / a, which belongs to the pilot scale, and its quality fluctuates greatly with the change of raw acid quality, the consumption of raw materials is large, and it is difficult to realize industrialization
So far, there has been no report on the purification of wet-process phosphoric acid by solvent extraction to achieve industrial production

Method used

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  • Purified wet-process technique for producing phosphoric acid and equipment thereof
  • Purified wet-process technique for producing phosphoric acid and equipment thereof

Examples

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Effect test

Embodiment 1

[0022] Embodiment 1: The specific technological process of 5,000 tons / year wet-process phosphoric acid purification is as follows:

[0023] Concentration from acid tank about 48% P 2 o 5 Concentrated phosphoric acid enters the desulfurization and decolorization tank after being metered, and the desulfurization agent phosphate rock powder and calcium carbonate are metered and then enter the desulfurization and decolorization tank. 3 reaction to generate CaSO 4 2H 2 O achieves the purpose of desulfurization, and calcium carbonate is also combined with F - The reaction produces CaF 2 Precipitation; decolorizing agent sodium carbonate and diatomaceous earth are added to the desulfurization and decolorization tank to react with fluorosilicate (salt) in phosphoric acid to produce sodium fluorosilicate precipitation; at the same time, activated carbon is quantitatively added to the desulfurization and decolorization tank and phosphoric acid for decolorization reaction to remove p...

Embodiment 2

[0026] Embodiment 2: The used rotary vibrating sieve plate tower of 5,000 tons / year wet-process phosphoric acid purification production process is as attached figure 2 shown.

[0027] The tower is composed of an upper clarification chamber 14, a tower body 7, and a lower clarification chamber 1, with a total height of 11,908mm; a cover plate 13 is provided on the top of the tower; The 7 rooms of the tower body are connected by upper cones; the outer diameter of the tower body 7 is 800 mm, and there are 70 to 115 sieve plates 9 in total, and the sieve hole diameter is 12 mm; the upper clarification chamber 14 has a phosphoric acid (heavy phase) inlet pipe 15, and the lower clarification chamber 1 has an extractant (light phase) inlet pipe 17 inside, and a glass liquid level gauge 2 outside; there is a rotating shaft 8 in the tower; two sets of B-shaped ear supports 6 are outside the tower body.

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Abstract

The invention discloses a production process and equipment for purifying wet-process phosphoric acid, and relates to a process technology for purifying wet-process phosphoric acid by solvent extraction. The present invention adopts the following measures on the basis of the original process for preparing industrial-grade phosphoric acid with wet-process phosphoric acid: (1) a desulfurization and defluorination buffer tank is set in the pretreatment stage and a fine desulfurization and iron removal tank is set between the extraction tank and the washing tank. tank to strengthen desulfurization, defluorination and iron removal; (2) the extraction, washing and stripping processes are all carried out in the rotary vibrating sieve plate tower; (3) a demulsification tank is set between the washing tower and the stripping tower. The rotary vibrating sieve plate column of the present invention is a special equipment developed and designed by itself according to the process requirements and practical experience, and is also the key equipment of the present invention. Using the technology and equipment of the present invention, not only can the purification of wet-process phosphoric acid be industrialized, the purified wet-process phosphoric acid can reach the quality standard of industrial-grade phosphoric acid, but also the consumption and purification cost can be greatly reduced.

Description

technical field [0001] The invention relates to a production process of phosphoric acid, in particular to a production process technology and equipment for purifying wet-process phosphoric acid by solvent extraction. Background technique [0002] The purification process of wet-process phosphoric acid mainly includes chemical precipitation method, ion exchange method, phosphoric acid concentration purification method, solvent extraction method and crystallization method. At present, solvent extraction method is generally used in industry. The application of solvent extraction has been recorded in the book "Phosphate, Phosphate Fertilizer and Compound Fertilizer" (Edited by Jiang Shanxiang. Beijing: Chemical Industry Press, 1999.425-426), which introduces the use of solvent by French Rhone-Planck Company. Central Liqueur process for purification of wet-process phosphoric acid by extraction. In recent years, people have made some improvements to the production process of solv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/234
Inventor 王邵东冯胜波禹志宏
Owner WENGFU (GRP) CO LTD
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