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Method of classification utilizing wet-process phosphoric acid

A wet-process phosphoric acid and phosphoric acid technology, applied in ammonium orthophosphate fertilizers, chemical instruments and methods, alkaline orthophosphate fertilizers, etc., can solve the problems of adjusting product types and output, increasing equipment investment, occupying land, etc. The effect of improving purity, reducing cost and reducing equipment investment

Inactive Publication Date: 2008-12-10
四川川大中德环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above contents show that, as far as the prior art is concerned, the preparation of compound fertilizers and industrial grade and food grade phosphoric acid and phosphates with wet-process phosphoric acid all adopts a set of independent technological processes to produce a product. The disadvantages are: 1. A complete set of equipment is required to produce one product, and multiple sets of complete equipment are required to produce multiple products, which will inevitably increase equipment investment and occupy more land; 2. Make it difficult for enterprises to adjust product types in a timely manner according to market needs and output

Method used

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  • Method of classification utilizing wet-process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] In the present embodiment, the composition of raw material wet-process phosphoric acid used is as follows:

[0065] P 2 o 5 SO 4 2- F Fe As heavy metal (calculated as Pb) chromaticity

[0066] 27.80% 2.19% 1.68% 0.71% 0.0014% 0.0025% >300

[0067] The process flow of this embodiment is shown in Figure 1. The production of fertilizer-grade monoammonium phosphate and diammonium phosphate, industrial phosphate, and industrial-grade purified phosphoric acid forms an organic whole.

[0068] Wet-process phosphoric acid is 400,000 tons, and 100,000 tons of the supernatant with low impurity content is extracted for defluorination, decolorization, desulfurization, and then filtered for extraction and back extraction to obtain primary purified phosphoric acid. 50% of the primary purified phosphoric acid is used to prepare industrial phosphate, and 50% of the primary purified phosphoric acid is washed and stripped to obtain industrial grade purified phosphoric aci...

Embodiment 2

[0102] As shown in Figure 2, on the basis of Example 1, continue to classify, 50% of the industrial-grade purified phosphoric acid prepared in Example 1 is concentrated to produce industrial-grade phosphoric acid, and the remaining 50% industrial-grade purified phosphoric acid is defluorinated and defluorinated. Arsenic, heavy metal removal treatment to obtain food-grade purified phosphoric acid.

[0103] 1. Process parameters for producing industrial grade phosphoric acid

[0104] Concentrating industrial-grade purified phosphoric acid is industrial-grade phosphoric acid. Concentration adopts forced vacuum concentration equipment, and the vacuum degree is 80kpa. The content of the relevant components of the obtained industrial grade phosphoric acid is as follows:

[0105] P 2 o 5SO 4 2- F Fe As heavy metal (calculated as Pb) chromaticity

[0106] 61.50% 0.0010% 0.02% 0.0020% 0.0004% 0.0006% <20

[0107] 2. Process parameters for preparing food-grade purified phosp...

Embodiment 3

[0110] As shown in Figure 3, continue classification on the basis of Example 2, 50% of the food-grade purified phosphoric acid prepared in Example 2 is used to prepare food-grade and pharmaceutical-grade phosphoric acid, and 40% of the food-grade purified phosphoric acid is used to prepare food Phosphate, food grade purified phosphoric acid 10% is used to prepare electronic grade phosphoric acid.

[0111] 1. Process parameters for the production of food-grade phosphoric acid and pharmaceutical-grade phosphoric acid

[0112] Concentrating food-grade purified phosphoric acid is food-grade phosphoric acid. Concentration is carried out under vacuum conditions, the vacuum degree is 93kpa, and the equipment used is a rotary evaporator. Prepared food grade phosphoric acid, the content of relevant component is as follows:

[0113] P 2 o 5 SO 4 2- F Fe As heavy metal (calculated as Pb) chromaticity

[0114] 61.50% 0.0010% 0.001% 0.0020% 0.0001% 0.0001% <20

[0115] Th...

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Abstract

A method for stage-by-stage utilization of wet-process phosphoric acid includes: (1) preparing initial-cleaning phosphoric acid by extracting upper clear liquor, (2) using one part of phosphoric acid obtained from step 1 to manufacture inductrial phosphate, (3) using the other part of the initial-cleaning phosphoric acid to prepare industrial cleaning phosphoric acid, (4) preparing ammonium phosphate compound fertilizer by the remnant after extraction. In addition, the industrial cleaning phosphoric acid can be further concentrated to industrial phosphoric acid, and food grade cleaning phosphoric acid can be manufactured from the rest by defluorination, dearsenication, and removal of heavy metals. Said food grade cleaning phosphoric acid is classified into three parts, one used for food grade and medicinal grade phosphoric acid production by concentration, one used for food grade phosphoric acid, and one for electronic grade phosphoric acid. This method can reduce apparatus investment and regulate the type and yield of products according to requirments of market.

Description

technical field [0001] The invention belongs to the field of wet-process phosphoric acid purification and application of wet-process phosphoric acid, in particular to a method for preparing industrial-grade, food-grade, electronic-grade phosphoric acid, compound fertilizer, industrial phosphate and food phosphate by wet-process phosphoric acid. Background technique [0002] "Phosphate, Phosphate Fertilizer and Compound Fertilizer" (Editor-in-Chief Jiang Shanxiang, Chemical Industry Press, March 1999) introduces the solvent extraction of industrial-grade phosphoric acid and food-grade phosphoric acid used by French Rhone-Planck company Method - Central Liqueur process (see the book P 429 ~P 430 ), the process contains 40-50% P 2 o 5 Wet-process phosphoric acid is used as the raw material, and the process steps include clarification, decolorization, extraction, washing, back-extraction with water, back-extraction of the ester phase after back-extraction with brine, de-arsen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/234C05B7/00
Inventor 李军钟本和李艳凤雷婷
Owner 四川川大中德环保技术有限公司