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Washing technology for refinement of wet-process phosphoric acid by solvent extraction method

A technology of wet-process phosphoric acid and extraction method, which is applied in the fields of phosphorus compounds, chemical instruments and methods, and inorganic chemistry. Economic benefits, the effect of ensuring the selling price

Active Publication Date: 2012-05-09
吴杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to overcome the metal ions such as nickel, chromium, manganese and molybdenum that are corroded in the phosphoric acid feed liquid that exist in the prior art, the removal effect of sulfate radical is not good enough, and the recycling rate of washing water Low defects and problems, providing a method that can effectively remove metal ions such as nickel, chromium, manganese, and molybdenum that have been corroded in the phosphoric acid feed solution, can improve the removal effect of sulfate radicals, and have a relatively high recovery rate of washing water. Advanced washing process for refining wet-process phosphoric acid by solvent extraction

Method used

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  • Washing technology for refinement of wet-process phosphoric acid by solvent extraction method

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Experimental program
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Embodiment 1

[0049] A washing process for refining wet-process phosphoric acid by solvent extraction, comprising the following steps in sequence:

[0050] The first step: full production: first pretreat the crude phosphoric acid obtained by the wet method, the pretreatment includes the steps of concentration, defluorination, desulfurization, decolorization and filtration in sequence, and then extract the filtered filtrate, after extraction The resulting organic phase is saturated;

[0051] The second step: the preparation of washing water: first take phosphoric acid with a concentration of 400g / L as the matching acid, and the ratio of the matching acid to the saturated one is 1:25, and then add NH 4 + The ions are added to the acid for dissolution according to 100% of the stoichiometric amount of sulfuric acid in the saturated medium. After the dissolution is completed, filter, and the filtered filtrate is the washing water;

[0052] The third step: the washing process: first use the abo...

Embodiment 2

[0055] Step is with embodiment 1, and difference is:

[0056] The second step: the preparation of washing water: first take phosphoric acid with a concentration of 500g / L as the matching acid, and the ratio of the matching acid to the saturated one is 1:16, and then add NH 4 + The ions are added to the acid compound according to 120% of the stoichiometric amount of sulfuric acid in the saturated medium for dissolution, and then filtered after the dissolution is completed, and the filtrate obtained from the filtration is the washing water;

[0057] The third step: washing process: see attached table 1 for product quality; the follow-up treatment of the washing water refers to: first recovering the washing water from the extraction agent, and then sending the treated washing water into an airtight container Then add sulfides to the washing water, add 100mL of sulfides with a mass percentage concentration of 6% per liter of washing water, heat again, and keep stirring at 85-90°C...

Embodiment 3

[0059] Step is with embodiment 1, and difference is:

[0060] The second step: the preparation of washing water: first take phosphoric acid with a concentration of 600g / L as the matching acid, and the ratio of the matching acid to the saturated one is 1:22, and then add NH 4 + The ions are added to the acid compound according to 110% of the stoichiometric amount of sulfuric acid in the saturated medium for dissolution, and then filtered after the dissolution is completed, and the filtrate obtained from the filtration is the washing water;

[0061] The third step: washing process: see attached table 1 for product quality; the follow-up treatment of the washing water refers to: first recovering the washing water from the extraction agent, and then sending the treated washing water into an airtight container Then add sulfides into the washing water, add 200mL of sulfides with a mass percentage concentration of 1% per liter of washing water, heat again, and keep stirring at 85-90...

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Abstract

The invention relates to a washing technology for refinement of wet-process phosphoric acid by a solvent extraction method. The technology comprises: subjecting crude phosphoric acid obtained from a wet process to pretreatment and extraction in order so as to obtain a saturated phase, and taking 400-600g / L of phosphoric acid as mixing acid, with the phase ratio of the mixing acid and the saturated phase maintained at 1:16-25, then adding NH4<+> ions which are of 100-120% of the stoichiometric amount of sulfate radicals in the saturated phase into the mixing acid for dissolving, conducting filtration after dissolving, and washing the saturated phase with washing water obtained from filtration so as to obtain a washed phase and scourage, carrying out subsequent treatment to the washed phase so as to obtain industrial grade 85% phosphoric acid, and subjecting the scourage to heavy metal ion removal and desulphurization treatment in order, thus obtaining colorless or white industrial grade monoammonium phosphate. The technology design of the invention not only can effectively remove corroded nickel, chromium, manganese, molybdenum and other metal ions in a phosphoric acid feed liquid and improve sulfate radical removing effect, but also has high recovery and utilization rate to the scourage, thus boasting powerful economic benefits.

Description

technical field [0001] The invention relates to a process for removing impurities of wet-process phosphoric acid, in particular to a washing process for refining wet-process phosphoric acid by solvent extraction, which is particularly suitable for removing colored heavy metal ions in the extracted organic phase and recycling the resulting Rinse off with water. Background technique [0002] At present, in the process of purifying wet-process phosphoric acid into industrial-grade phosphoric acid or food-grade phosphoric acid by solvent extraction, the crude phosphoric acid must be pretreated first, and then the pretreated phosphoric acid is extracted with an extractant. During the extraction process, First contact the extractant (organic phase) with the pretreated phosphoric acid (water phase), then extract the phosphoric acid into the organic phase by the extractant, and leave most of the impurities in the raffinate water phase. At this time, the loaded phosphoric acid The u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/46
Inventor 吴杰
Owner 吴杰
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