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Method for deep purification of phosphogypsum by extraction method

A deep purification and phosphogypsum technology, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium compounds, etc., can solve the problems of incomplete treatment, high energy consumption, secondary pollution, etc., and achieve no secondary pollution emissions, low energy consumption, and thorough purification

Active Publication Date: 2016-10-26
中化农业(临沂)研发中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have the disadvantages of high energy consumption, incomplete treatment, and easy to cause secondary pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add 3t of dilute sulfuric acid (mass concentration 25%) solution in the mixing tank, start stirring, then add 2t of phosphogypsum, after stirring evenly, enter the next step;

[0023] (2) Pump the above-mentioned slurry into the reaction tank, heat it with steam, and add 0.5t concentrated sulfuric acid at the same time to stabilize the sulfuric acid concentration in the reaction system at 30-40%, control the temperature at 100°C, and react for 120min.

[0024] (3) After the reaction is finished, the slurry is pumped into the cooling tank, and the circulating cooling water is turned on for cooling (a jacket is arranged outside the cooling tank, and circulating water is passed into the jacket to cool down the material in the cooling tank). Wait for the temperature to drop to 80°C, then pump the slurry into the extraction tank, add an organic composite extractant to the extraction tank, the organic composite extractant is composed of 50% n-butanol and 50% cyclohexane ac...

Embodiment 2

[0030] (1) Add 2.2t of dilute sulfuric acid (mass concentration 30%) solution in the mixing tank, start stirring, then add 2t of phosphogypsum, after stirring evenly, enter the next step;

[0031] (2) Pump the slurry into the reaction tank, heat it with steam, and add concentrated sulfuric acid at the same time to stabilize the sulfuric acid concentration in the reaction system at 30-40%, control the temperature at 90° C., and react for 100 minutes.

[0032] (3) After the reaction is finished, the slurry is pumped into the cooling tank, and the circulating cooling water is turned on for cooling (a jacket is arranged outside the cooling tank, and circulating water is passed into the jacket to cool down the material in the cooling tank). Wait for the temperature to drop to 80°C, then pump the slurry into the extraction tank, add an organic composite extractant to the extraction tank, the organic composite extractant is composed of 80% n-octanol and 20% sulfonated kerosene accordi...

Embodiment 3

[0038] (1) Add 4t of dilute sulfuric acid (mass concentration 20%) solution in the slurry mixing tank, start stirring, then add 2t of phosphogypsum, after stirring evenly, enter the next step;

[0039] (2) Pump the slurry into the reaction tank, heat it with steam, and add concentrated sulfuric acid at the same time to stabilize the sulfuric acid concentration in the reaction system at 30-40%, control the temperature at 130° C., and react for 60 minutes.

[0040](3) After the reaction is finished, the slurry is pumped into the cooling tank, and the circulating cooling water is turned on for cooling. Wait for the temperature to drop to 80°C, then pump the slurry into the extraction tank, add an organic composite extractant to the extraction tank, the organic composite extractant consists of 35% methyl isobutyl ketone, 40% tributyl phosphate % and 25% sulfonated kerosene, the volume ratio of the organic phase to the slurry phase in the extraction tank is about 1:7, and the extra...

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Abstract

The invention discloses a method for deep purification of phosphogypsum by an extraction method. The method comprises the following steps: (1) adding dilute sulfuric acid in a slurry mixing tank, then adding phosphogypsum, and performing stirring to uniformly dispersing phosphogypsum; (2) pumping the materials which are uniformly dispersed in the step (1) into a reaction tank, adding concentrated sulfuric acid simultaneously, keeping the concentration of the sulfuric acid of a reaction system at 30 to 40%, and carrying out a reaction under stirring; (3) after the reaction accomplishment, pumping materials into a cooling tank, pumping the materials into an extraction tank after the temperature of the materials is lower than 80 DEG C, and adding an organic composite extractant to carry out extraction, (4) pumping the materials which are extracted in the step (3) into a settling separation tank, layering, filtering an upper-layer organic phase, washing and returning a filtered filtrate to the extraction tank, filtering, washing and drying a lower-layer phosphogypsum slurry layer, and obtaining the purified phosphogypsum. The method for the deep purification of phosphogypsum by the extraction method disclosed by the invention can obviously improve the whiteness of phosphogypsum and lower the content of impurities such as phosphorus, fluorine , silicon, metal oxides and the like in phosphogypsum, and then anhydrite is directly obtained.

Description

technical field [0001] The invention relates to a method for deep purification of phosphogypsum by an extraction method, belonging to the technical field of chemical production. Background technique [0002] Phosphogypsum is the waste residue discharged by phosphorus chemical enterprises. Prepare 1 ton of phosphoric acid (with 100% P 2 O5 meter) produces 4.8-5.0 tons of phosphogypsum (dry basis). At present, the world's output of phosphogypsum has exceeded 280 million tons, and my country's output has exceeded 50 million tons. Any discharge will cause environmental pollution. Most enterprises use open-air storage yards to stack them. Phosphogypsum is a moist fine powder, 95% of the particles are smaller than 0.2mm, the free water content is 20% to 30%, and it contains a small amount of harmful impurities such as phosphorus, fluorine, organic matter and silicon dioxide. It is acidic and its pH value is generally below 4.5. . Long-term accumulation, due to wind erosion and...

Claims

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Application Information

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IPC IPC(8): C01F11/46
CPCC01F11/466C01F11/468C01P2006/80
Inventor 郑开元盛勇周佩陈明凤邹小丽
Owner 中化农业(临沂)研发中心有限公司
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