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 consumptio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1

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

[0023] (2) The slurry was pumped into the reaction tank, heated by steam, and 0.5t of concentrated sulfuric acid was added simultaneously to stabilize the sulfuric acid concentration of the reaction system at 30-40%, and the temperature was controlled at 100°C for 120 minutes.

[0024] (3) After completing the reaction, pump the slurry into the cooling tank, and turn on the circulating cooling water for cooling (a jacket is set outside the cooling tank, and circulating water is introduced into the jacket to cool the material in the cooling tank). When the temperature drops to 80°C, the slurry is pumped into the extraction tank, and an organic compound extractant is added to the extraction tank. The organic compound extractant is composed of 50% n-butanol and 50% cy...

Example Embodiment

[0029] Example 2

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

[0031] (2) The slurry was pumped into the reaction tank, heated by steam, and concentrated sulfuric acid was added at the same time to stabilize the sulfuric acid concentration of the reaction system at 30-40%, and the temperature was controlled at 90°C for 100 minutes.

[0032] (3) After completing the reaction, pump the slurry into the cooling tank, and turn on the circulating cooling water for cooling (a jacket is set outside the cooling tank, and circulating water is introduced into the jacket to cool the material in the cooling tank). Wait for the temperature to drop to 80°C, then pump the slurry into the extraction tank, and add an organic compound extractant to the extraction tank. The organic compound extractant is composed of 80% n-octanol and 20% sulfonated k...

Example Embodiment

[0037] Example 3

[0038] (1) Add 4t of dilute sulfuric acid (mass concentration 20%) solution in the sizing tank, turn on stirring, then add 2t of phosphogypsum, and go to the next step after stirring evenly;

[0039] (2) The above-mentioned slurry was pumped into the reaction tank, heated by steam, and at the same time, concentrated sulfuric acid was added to stabilize the sulfuric acid concentration of the reaction system at 30-40%, and the temperature was controlled at 130 ° C for 60 minutes.

[0040](3) After the reaction is completed, 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, and add an organic compound extractant to the extraction tank. The organic compound extractant is composed of 35% methyl isobutyl ketone, 40 % and 25% of sulfonated kerosene, the volume ratio of the organic phase to the slurry phase in the extraction...

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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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