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Method for deeply purifying and purifying calcium sulfate dihydrate by using fine-particle ardealite

A calcium sulfate dihydrate, deep purification technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, inorganic chemistry, etc., can solve the problems of poor purification effect, high energy consumption, long time consumption, etc., and achieve purification efficiency High, good treatment effect, good impurity removal effect

Active Publication Date: 2022-06-07
云南凝创环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lime neutralization is to add quicklime to the phosphogypsum slurry to neutralize the acidic substances in it, but the removal efficiency of organic matter is low
Flotation is to add a large amount of tap water, mix the material, and then let the phosphogypsum slurry stand still to repeatedly remove the black oil on its surface. This process takes a long time, has the lowest impurity removal efficiency, and the worst purification effect
These traditional treatment methods are generally inefficient, consume a lot of energy, and are prone to secondary pollution. The most serious problem is that it is almost impossible to remove eutectic phosphorus.
[0004] At present, no applicable method has been found for the efficient purification of phosphogypsum eutectic phosphorus

Method used

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  • Method for deeply purifying and purifying calcium sulfate dihydrate by using fine-particle ardealite
  • Method for deeply purifying and purifying calcium sulfate dihydrate by using fine-particle ardealite

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) sieving the phosphogypsum particles, and collecting fine-grained phosphogypsum with a particle size of less than 80 μm;

[0029] (2) according to the mass ratio of water and fine-grained phosphogypsum to be 3:1, add water in the fine-grained phosphogypsum of step (1), and fully stir to obtain slurry;

[0030] (3) Press (NH 4 ) 2 SO 4 : the slurry is a solid-liquid ratio of 5g / L, and (NH) is added to the slurry in step (2). 4 ) 2 SO 4 , turn on high-frequency vibration and electric heating, so that the slurry maintains high-frequency vibration at 80 °C, and the frequency of high-frequency vibration is 100KHz;

[0031] (4) After maintaining the high-frequency vibration for 30min, according to the dosage of 200mg / L, put nano-TiO into the slurry obtained in step (3). 2 ;

[0032] (5) maintaining high-frequency vibration, and using an ultraviolet light source with a power of 80W and a wavelength of 365nm to irradiate the slurry for 30min, so that a photocatalytic ...

Embodiment 2

[0038] (1) sieving the phosphogypsum particles, and collecting fine-grained phosphogypsum with a particle size of less than 80 μm;

[0039] (2) according to the mass ratio of water and fine-grained phosphogypsum to be 2:1, add water in the fine-grained phosphogypsum of step (1), and fully stir to obtain slurry;

[0040] (3) Press (NH 4 ) 2 SO 4 : the slurry is a solid-liquid ratio of 6g / L, and (NH) is added to the slurry in step (2). 4 ) 2 SO 4 , turn on high-frequency vibration and electric heating, so that the slurry maintains high-frequency vibration at 95 °C, and the frequency of high-frequency vibration is 50KHz;

[0041] (4) After maintaining the high-frequency vibration for 25min, according to the dosage of 180mg / L, put nano-TiO into the slurry obtained in step (3). 2 ;

[0042] (5) maintain high-frequency vibration, and use an ultraviolet light source with a power of 100W and a wavelength of 365nm to irradiate the slurry for 25min, so that a photocatalytic oxida...

Embodiment 3

[0048] (1) sieving the phosphogypsum particles, and collecting fine-grained phosphogypsum with a particle size of less than 80 μm;

[0049] (2) according to the mass ratio of water and fine-grained phosphogypsum to be 5:1, add water in the fine-grained phosphogypsum of step (1), and fully stir to obtain slurry;

[0050] (3) Press (NH 4 ) 2 SO 4 : the slurry is a solid-liquid ratio of 4g / L, and (NH) is added to the slurry in step (2). 4 ) 2 SO 4 , turn on high-frequency vibration and electric heating, so that the slurry maintains high-frequency vibration at 90 ℃, and the frequency of high-frequency vibration is 200KHz;

[0051] (4) After maintaining the high-frequency vibration for 40min, according to the dosage of 100mg / L, put nano-TiO into the slurry obtained in step (3). 2 ;

[0052] (5) maintain high-frequency vibration, and use an ultraviolet light source with a power of 90W and a wavelength of 365nm to irradiate the slurry for 40min, so that a photocatalytic oxidat...

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Abstract

The invention discloses a method for deeply purifying and purifying calcium sulfate dihydrate by using fine-particle ardealite, which comprises the following steps: screening ardealite particles, collecting the fine-particle ardealite, adding water, fully stirring to obtain slurry, adding (NH4) 2SO4, keeping high-frequency vibration, and adding nano TiO2; an ultraviolet light source is adopted to irradiate the slurry, so that the slurry is subjected to photocatalytic oxidation reaction; carrying out solid-liquid separation on the slurry to obtain filtrate and filter residues; placing the filtrate in a low-temperature negative-pressure environment, cooling and crystallizing the calcium sulfate dissolved in the filtrate, and filtering the obtained liquid with crystals to obtain a crystal substance; and placing the filter residue and the crystal substance in a microwave field for irradiation to obtain a dried material which is purified calcium sulfate dihydrate. The method has the advantages of mild reaction conditions, obvious removal effect on various impurities such as eutectic phosphorus, phosphorus compounds, organic matters and the like, high phosphogypsum purification degree and excellent calcium sulfate dihydrate purification effect.

Description

technical field [0001] The invention relates to a method for deep purification and purification of calcium sulfate dihydrate with fine particle phosphogypsum, belonging to the technical field of building materials. Background technique [0002] Phosphogypsum is a solid waste produced during the production of wet phosphoric acid. For every 1t of phosphoric acid produced, about 2t of sulfuric acid is consumed, and 4-5t of phosphogypsum is produced at the same time. The annual discharge of phosphogypsum in my country's phosphorus chemical industry is about 50 million tons. Its main component is CaSO 4 ·2H 2 O, but its industrial application is greatly limited due to the presence of organic impurities, including phosphorus, fluorine, and alkali metal salts. [0003] The existence of impurity eutectic phosphorus in phosphogypsum seriously affects the strength and other properties of the hardened body of gypsum cementitious materials. At present, the traditional purification me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
CPCC01F11/468C01P2006/80Y02W30/91
Inventor 全思臣赵志曼吴磊韩春福仇晨李泓良史思慧
Owner 云南凝创环保科技有限公司
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