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Desulfurization and resource utilization method of phosphorus fertilizer waste residues

A phosphate fertilizer waste residue and resource utilization technology, applied in chemical instruments and methods, separation methods, phosphoric acid and other directions, can solve problems such as dust flying, pollution of surface water and groundwater, land occupation, etc., achieve significant economic benefits, realize resource utilization, Significant social and environmental benefits

Inactive Publication Date: 2018-12-07
GUANGZHOU HUAKE ENVIRONMENTAL PROTECTION ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The long-term stacking of these phosphate fertilizer waste residues not only invades the land, causing dust to fly, but also soaked in rainwater, the soluble harmful components in the ash will pollute surface water and groundwater

Method used

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  • Desulfurization and resource utilization method of phosphorus fertilizer waste residues
  • Desulfurization and resource utilization method of phosphorus fertilizer waste residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The phosphate fertilizer waste residue is dried and crushed to below 300 mesh to obtain the pretreated phosphate fertilizer waste residue. According to the ratio of 10mL deionized water / 1g pretreated phosphate fertilizer waste residue, add deionized water and pretreated phosphate fertilizer waste residue into the soaking tank successively, stir at room temperature for 12 hours, filter with a centrifuge to obtain impregnation liquid and filter cake, and heat the impregnation liquid to 80 Keep at ℃ for 60min to obtain phosphoric acid. The filter cake, that is, the phosphate fertilizer waste residue, is dried and pulverized, and sent to the slurry tank. Add water and stir continuously to form a slurry with a solid content of 25%, and heat it to 60°C to obtain an absorption liquid. Keep the pH value of the absorption liquid at 7, and regularly discharge the sediment at the bottom of the tank. The absorption liquid is atomized by the nozzle and pumped into the absorption tow...

Embodiment 2

[0061] The phosphate fertilizer waste residue is dried and crushed to below 300 mesh to obtain the pretreated phosphate fertilizer waste residue. According to the ratio of 40mL deionized water / 1g pretreated phosphate fertilizer waste residue, add deionized water and pretreated phosphate fertilizer waste residue into the impregnation tank successively, stir at room temperature for 24 hours, filter with a centrifuge to obtain impregnation liquid and filter cake, and heat the impregnation liquid to 70 Keep at ℃ for 60min to obtain phosphoric acid. The filter cake, that is, the phosphate fertilizer waste residue, is dried and pulverized, and sent to the slurry tank, adding water and continuously stirring to form a slurry with a solid content of 20%, heating to 30°C to obtain an absorption liquid, keeping the pH value of the absorption liquid at 8, and regularly discharging the sediment at the bottom of the tank. The absorption liquid is atomized by the nozzle and pumped into the a...

Embodiment 3

[0064] The phosphate fertilizer waste residue is dried and crushed to below 300 mesh to obtain the pretreated phosphate fertilizer waste residue. According to the ratio of 20mL deionized water / 1g pretreated phosphate fertilizer waste residue, add deionized water and pretreated phosphate fertilizer waste residue into the impregnation tank successively, stir at room temperature for 36 hours, filter with a centrifuge to obtain impregnation liquid and filter cake, and heat the impregnation liquid to 60 Keep at ℃ for 30min to get phosphoric acid. The filter cake, that is, the phosphate fertilizer waste residue, is dried and pulverized, and sent to the slurry tank. Add water and stir continuously to form a slurry with a solid content of 15%, and heat it to 50°C to obtain an absorption liquid. Keep the pH value of the absorption liquid at 6, and regularly discharge the sediment at the bottom of the tank. The absorption liquid is atomized by the nozzle and then pumped into the absorpt...

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Abstract

The invention discloses a desulfurization and resource utilization method of phosphorus fertilizer waste residues. The method comprises the following steps: reducing granularity of the phosphorus fertilizer waste residues through pre-treatment; separating out impregnation fluid and filter cake through impregnation and filtration, wherein impregnation fluid contains the phosphorus pentoxide in thephosphorus fertilizer waste residues; heating and concentrating the impregnation fluid; drying and pulverizing the filter cake to make slurry and performing flue gas desulfurization; and performing post-treatment on the desulfurized product to separate magnesium sulfate solutions from calcium sulfate dihydrate precipitants, thus finally obtaining magnesium sulfate heptahydrate and calcium sulfatedihydrate to complete desulfurization and resource utilization of the phosphorus fertilizer waste residues. According to the desulfurization and resource utilization method of the phosphorus fertilizer waste residues disclosed by the invention, the phosphorus fertilizer waste residues are used in flue gas desulfurization, and the desulfurization efficiency is up to 96 percent or more, so that resource utilization of the phosphorus fertilizer waste residues is realized, and products such as phosphoric acid, the calcium sulfate dihydrate and the magnesium sulfate heptahydrate are obtained; industrial solid wastes are turned into products with higher additional values, and the desulfurization and resource utilization method has better economic, environmental and social benefits.

Description

technical field [0001] The invention belongs to the technical field of industrial solid waste treatment and air pollution control, and in particular relates to a method for desulfurization and resource utilization of phosphate fertilizer waste residue. Background technique [0002] Phosphate fertilizer occupies an important position in my country's chemical fertilizer field, and is an important basic industry that supports the country's agricultural development and ensures food security. my country's phosphate fertilizer production accounts for about 40% of the world's total output, ranking first in the world. [0003] Phosphate fertilizers are divided into acid phosphate fertilizers, thermal phosphate fertilizers and phosphorus compound fertilizers according to different production methods. According to the solubility of phosphorus compounds in phosphate fertilizers, they are divided into three categories, namely water-soluble phosphate fertilizers, citrate-soluble phosphat...

Claims

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Application Information

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IPC IPC(8): B01D53/14C01B25/18C01F5/40C01F11/46
CPCB01D53/145B01D2258/0283C01B25/18C01F5/40C01F11/464
Inventor 岑超平陈雄波唐志雄方平唐子君钟佩怡林雅思
Owner GUANGZHOU HUAKE ENVIRONMENTAL PROTECTION ENG
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