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Method for pretreatment enhancing of wet-process phosphoric acid extraction reaction

A wet-process phosphoric acid and pretreatment technology, applied in chemical instruments and methods, phosphate material processing, phosphorus compounds, etc., can solve the problems of shortening the equipment life cycle, incomplete decomposition of phosphate rock powder, and no great significance. The effect of comprehensive utilization cost reduction, good industrial application prospect and low price

Active Publication Date: 2019-06-18
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the investment and operation are twice that of the two-water method, which is not very meaningful for manufacturers who need dilute phosphoric acid. At the same time, in the half-water-one-two-water method, the half-water reaction zone is more likely to scale and shorten the service life of the equipment.
At the same time, the suitable conditions for the semi-hydric-dihydric process are relatively narrow, and the production is unstable
[0004] The production of wet-process phosphoric acid by the dihydric method is likely to lead to the formation of a passivation film, resulting in incomplete decomposition of the phosphate rock powder, which remains in the gypsum and affects the yield of phosphorus.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Weigh 82.4g of flotation concentrate, measure 55.6g of mixed reagent (including 30.25wt% hydrochloric acid aqueous solution, 47% phosphoric acid aqueous solution, 63.5wt% nitric acid aqueous solution, 45wt% sulfuric acid aqueous solution, wet-process phosphoric acid production Acid return produced, slurry return produced by wet-process phosphoric acid production, and phosphogypsum slag field wastewater), the above-mentioned objects were mixed and placed in a 250mL conical flask and shaken in a shaker for 12h (27°C, 180rpm) for pre-decomposition.

[0027] 2) Pour the pre-decomposed 12h pulp and 66.4mL phosphoric acid (24wt %) into a 1000mL graduated cylinder, evenly drop 50mL concentrated sulfuric acid (30min) to start the extraction reaction, and then obtain the primary filter gypsum, weigh 20g of the primary filter gypsum and add 60g of water Shake 3 times in the Erlenmeyer flask (27°C, 20min) to get water-washed gypsum.

[0028] 3) The phosphorus content of the gyp...

Embodiment 2

[0031] 1) Weigh 80.1g of flotation concentrate, measure 158.3g of mixed reagents (22.3 wt% hydrochloric acid aqueous solution, 18.6% phosphoric acid aqueous solution, 50wt% nitric acid aqueous solution, 66wt% sulfuric acid aqueous solution, produced by wet-process phosphoric acid Acid return, slurry return produced by wet-process phosphoric acid production, and phosphogypsum slag field wastewater), the above objects are mixed and placed in a 250mL Erlenmeyer flask and shaken in a shaker for 24h (27°C, 180rpm) for pre-decomposition.

[0032] 2) Pour the pre-decomposed 24h ore slurry and 66.4mL slurry (containing 24wt% phosphoric acid) into a 1000mL graduated cylinder, evenly drop 50mL concentrated sulfuric acid (30min) to start the extraction reaction, and then obtain the primary filter gypsum, weigh 20g of the primary filter gypsum and add water 60g was placed in a conical flask and shaken 3 times (27°C, 20min) to obtain water-washed gypsum.

[0033] 3) The phosphorus content ...

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Abstract

The invention discloses a method for pretreatment enhancing of wet-process phosphoric acid extraction reaction. A product which can be produced by a wet-process phosphoric acid production enterprise on a large scale is used as a raw material of a pretreatment agent, so that the raw material is low in cost and rich in source; water is added for dilution, so that preparation is convenient; in existing production devices of a wet-process phosphoric acid plant, mild reaction conditions are adopted for pretreatment, so that easiness in on-site industrialization is realized; a pre-decomposition agent which is used has no impact on subsequent processes; phosphorus recycling rate can be increased remarkably. The method is high in phosphorite applicability, stable in operation and high in operationrate, harmless treatment stacking of obtained phosphogypsum can be realized by only using little limewater for neutralization, and comprehensive utilization cost of phosphogypsum is lowered substantially, so that the method has great industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of phosphoric acid production, in particular to a method for pretreatment and intensified wet phosphoric acid extraction reaction. Background technique [0002] Phosphoric acid is an important chemical raw material, which is widely used in chemical fertilizer, food, paint, electronic industry and other industries. Wet-process phosphoric acid accounts for more than 90% of the total phosphoric acid production, and the wet-process phosphoric acid process is dominated by the dihydrate process. However, the recovery rate of phosphorus in the production of wet-process phosphoric acid by the dihydric method is relatively low, resulting in a large waste of phosphorus resources. Phosphorus remaining in phosphogypsum will lead to high phosphorus content in gypsum, which is not conducive to the utilization of building materials, and discharge into the environment will cause serious environmental pollution. [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/225C01B25/01C01F11/46
Inventor 李洪强戈武肖林波田承涛张峻李东郎
Owner WUHAN INSTITUTE OF TECHNOLOGY