Method for removing harmful elements of wet-process phosphoric acid and derivative products thereof and equipment

A wet-process phosphoric acid, harmful element technology, applied in non-metallic elements, chemical instruments and methods, fluorosilicic acid, etc., can solve the problem of arsenic removal research or industrial experiments that are rarely reported, and reduce raw material consumption, reduce Visual pollution, the effect of improving quality

Pending Publication Date: 2019-12-06
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the production process of phosphate fertilizer, because concentrated phosphoric acid contains a certain amount of arsenic (about 50-60ppm), the arsenic content in phosphate fertilizer products is about 80ppm, which is far from the implementation standard of class I products As%≤0.005 and the quality of foreign products. There is still a certain gap in the execution standard of As%≤0.002
[0003] At present, the industrial arsenic removal of phosphoric acid and its derivatives is mainly used for the removal of arsenic of food-grade or electronic-grade related products. Products, research or industrial experiments on the direct removal of arsenic from wet-process phosphoric acid and its derivatives are rarely reported

Method used

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  • Method for removing harmful elements of wet-process phosphoric acid and derivative products thereof and equipment
  • Method for removing harmful elements of wet-process phosphoric acid and derivative products thereof and equipment
  • Method for removing harmful elements of wet-process phosphoric acid and derivative products thereof and equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) Use the assembled equipment for processing, add a sufficient amount of phosphorus pentasulfide to the wet-process phosphoric acid extraction tank, and filter it with a three-stage countercurrent washing rotary filter after fully reacting. In the phosphogypsum slag field, the filtrate is transferred to the wet-process phosphoric acid aging tank to collect the gas released during the reaction;

[0066] (2) Add phosphorus pentasulfide to the wet-process phosphoric acid aging tank, filter after fully reacting, filter residue turns back to the wet-process phosphoric acid extraction tank and proceeds to step (1), the filtrate is used for phosphoric acid concentration and phosphate fertilizer production, collects escaped in the reaction process gas;

[0067] (3) Dissolve the gas collected in steps (1), (2) in water, add SO 2 Configured for a concentration of 6% SO 2 Aqueous solution, add 30% H with a volume fraction of 1.75% to iodine-containing dilute phosphoric acid an...

Embodiment 2

[0070] (1) Use the assembled equipment for processing, add a sufficient amount of phosphorus pentasulfide to the wet-process phosphoric acid extraction tank, and filter it with a three-stage countercurrent washing rotary filter after fully reacting. In the phosphogypsum slag field, the filtrate is transferred to the wet-process phosphoric acid aging tank to collect the gas released during the reaction;

[0071] (2) Add phosphorus pentasulfide to the wet-process phosphoric acid aging tank, filter after fully reacting, and the filter residue turns back to the wet-process phosphoric acid extraction tank to continue step (1), and the filtrate is used for phosphoric acid concentration and phosphate fertilizer production. gas;

[0072] (3) Dissolve the gas collected in steps (1), (2) in water, add SO 2 configured for a concentration of 2% SO 2 Aqueous solution, add 30% H with a volume fraction of 0.5% to iodine-containing dilute phosphoric acid and fluosilicic acid 2 o 2 Oxidant...

Embodiment 3

[0075] (1) Use the assembled equipment for processing, add a sufficient amount of phosphorus pentasulfide to the wet-process phosphoric acid extraction tank, and filter it with a three-stage countercurrent washing rotary filter after fully reacting. In the phosphogypsum slag field, the filtrate is transferred to the wet-process phosphoric acid aging tank to collect the gas released during the reaction;

[0076] (2) Add phosphorus pentasulfide to the wet-process phosphoric acid aging tank, filter after fully reacting, and the filter residue turns back to the wet-process phosphoric acid extraction tank to continue step (1), and the filtrate is used for phosphoric acid concentration and phosphate fertilizer production. gas;

[0077] (3) Dissolve the gas collected in steps (1), (2) in water, add SO 2 Configured as 10% SO 2 Aqueous solution, add 30% H with a volume fraction of 3.0% to iodine-containing dilute phosphoric acid and fluosilicic acid 2 o 2 Oxidant, the reaction temp...

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Abstract

The invention relates to the technical field of treatment of wet-process phosphoric acids, in particular to a method for removing harmful elements of a wet-process phosphoric acid and derivative products thereof and equipment. According to the method for removing the harmful elements of the wet-process phosphoric acid and the derivative products thereof and the equipment, phosphorus pentasulfide is selected as an arsenic removal catalyst, and is added into a wet-process phosphoric acid extracting groove and a wet-process phosphoric acid ageing groove separately, a two-stage harmful element removing reaction is carried out to make arsenic in the wet-process phosphoric acid and the derivative products thereof enter a phosphogypsum stack finally in a form of an insoluble compound As2S3, not only is the arsenic removed, but also heavy metal cations of the harmful elements of Cr, Pb, Cu and the like in the wet-process phosphoric acid and the derivative products thereof are removed at the same time, the quality of the wet-process phosphoric acid and the derivative products thereof is improved, harmful elements in an obtained phosphate fertilizer are reduced, and a by-product hydrogen sulfide gas is used as a reducer of iodine molecules in extracted tail gas, so that consumption of a liquid SO2 raw material in an iodine recovery system is reduced, visual pollution of red smoke from the extracted tail gas is reduced, and iodine molecule resources are recovered.

Description

technical field [0001] The invention relates to the technical field of wet-process phosphoric acid treatment, in particular to a method and equipment for removing harmful elements of wet-process phosphoric acid and its derivative products. Background technique [0002] At present, in the production process of phosphate fertilizer, because concentrated phosphoric acid contains a certain amount of arsenic (about 50-60ppm), the arsenic content in phosphate fertilizer products is about 80ppm, which is far from the implementation standard of class I products As%≤0.005 and the quality of foreign products. There is still a certain gap in the execution standard of As%≤0.002. [0003] At present, the industrial arsenic removal of phosphoric acid and its derivatives is mainly used for the removal of arsenic of food-grade or electronic-grade related products. There are very few reports on direct research or industrial experiments on the removal of arsenic from wet-process phosphoric a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/238C01B25/237C01B7/14C01B33/10
CPCC01B25/238C01B25/237C01B7/14C01B33/103
Inventor 陈彬项双龙彭学江杨阳胡黔
Owner GUIZHOU KAILIN GRP CO LTD
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