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Method for improving gelling activity of ardealite

A phosphogypsum, active technology, applied in the field of improving the gelation activity of phosphogypsum, can solve the problems of many equipment, large investment, long process, etc.

Pending Publication Date: 2020-10-20
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are mainly the following aspects: 1. Phosphogypsum is used in the preparation of building materials such as various bricks and blocks, but its mixing amount is not large, generally less than 30%; 2. Phosphogypsum is used in the transportation field, but its mixing amount Only 2.8%; 3. Phosphogypsum production of sulfuric acid co-production of cement technology, but the process is long, many equipment, high energy consumption, large investment, technical difficulty; 3. Phosphogypsum production of plasterboard, this technology requires Gypsum is calcined. At present, the consumption of phosphogypsum for the industrialization of this technology is estimated to be no more than 10 million tons, which is a big gap compared with the annual increment of 70 million tons in my country.

Method used

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  • Method for improving gelling activity of ardealite
  • Method for improving gelling activity of ardealite
  • Method for improving gelling activity of ardealite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1. A method for improving the gelling activity of phosphogypsum, the method steps are as follows:

[0040] (1) first age the phosphogypsum retrieved from the storage yard with tap water for 24 hours, and control the water content to 35% during aging to obtain the aged phosphogypsum;

[0041] (2) wet-mill the aged phosphogypsum with a ball mill for 30 minutes to obtain wet-milled phosphogypsum;

[0042] (3) Roast the wet-milled phosphogypsum to 400°C, keep it warm for 3 hours, and then cool it down naturally to obtain the roasted phosphogypsum;

[0043] (4) First apply agent 1 to the phosphogypsum after roasting for heap leaching for 5 hours, then apply agent 2 for heap leaching for 10 hours, and the heap leaching temperature is 25-30°C to obtain phosphogypsum with improved gelling activity; wherein agent 1 is an aqueous solution, After 100g of roasting, phosphogypsum is used in an amount of 240ml. The mass fraction of potassium oxide in the aqueous solution is...

Embodiment 2

[0044] Example 2. A method for improving the gelling activity of phosphogypsum, the method steps are as follows:

[0045] (1) first age the phosphogypsum retrieved from the storage yard with tap water for 30 hours, and control the water content to 35% during aging to obtain aged phosphogypsum;

[0046] (2) wet-mill the aged phosphogypsum with a ball mill for 40 minutes to obtain wet-milled phosphogypsum;

[0047] (3) Roast the wet-milled phosphogypsum to 600°C, keep it warm for 5 hours and then cool it down naturally to obtain the roasted phosphogypsum;

[0048] (4) First apply agent 1 to the phosphogypsum after roasting for heap leaching for 8 hours, then apply agent 2 for heap leaching for 12 hours, and the heap leaching temperature is 25-30°C to obtain phosphogypsum with improved gelling activity; wherein agent 1 is an aqueous solution, After 100g of roasting, phosphogypsum is used in an amount of 280ml. The mass fraction of potassium oxide in the aqueous solution is 0.02%,...

Embodiment 3

[0049] Example 3. A method for improving the gelling activity of phosphogypsum, the method steps are as follows:

[0050] (1) first age the phosphogypsum retrieved from the stockyard with tap water for 24 hours, and control the water content to 50% during aging to obtain aged phosphogypsum;

[0051] (2) wet-mill the aged phosphogypsum with a ball mill for 40 minutes to obtain wet-milled phosphogypsum;

[0052] (3) Roast the wet-milled phosphogypsum to 500°C, keep it warm for 4 hours, and then cool it naturally to obtain the roasted phosphogypsum;

[0053] (4) First apply agent 1 to the phosphogypsum after roasting for heap leaching for 7 hours, then apply agent 2 for heap leaching for 14 hours, and the heap leaching temperature is 25-30°C to obtain phosphogypsum with improved gelling activity; wherein agent 1 is an aqueous solution, After 100g of roasting, phosphogypsum is used in an amount of 450ml. The mass fraction of potassium oxide in the aqueous solution is 0.5%, the m...

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Abstract

The invention discloses a method for improving the gelling activity of ardealite. The method comprises the following steps: (1) ageing phosphogypsum with water to obtain aged phosphogypsum; (2) carrying out wet grinding on the aged phosphogypsum to obtain wet-ground phosphogypsum; (3) roasting the wet-ground phosphogypsum, and cooling to obtain roasted phosphogypsum; and (4) respectively carryingout two-stage dump leaching on the roasted ardealite by using a medicament 1 and a medicament 2 to obtain the ardealite with improved gelling activity. The method has the advantages that the process is simple, the cost is low, the gelling activity of the phosphogypsum can be greatly improved, a building material prepared from the treated phosphogypsum is high in strength and strong in water leaching resistance, the doping amount can be larger than 70%, and a way is provided for large-scale use and comprehensive utilization of the phosphogypsum.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for improving the gelling activity of phosphogypsum. Background technique [0002] my country is the most populous country in the world, and it is also a large agricultural production country. The phenomenon of "poor potassium and phosphorus deficiency" is common in agricultural cultivated land. Agricultural production requires a large amount of phosphorus chemical fertilizers. With the rapid development of my country's agricultural production, the demand for phosphorus fertilizers is in the It is increasing year by year, and the production of phosphate fertilizer requires a large amount of phosphoric acid. At present, the main production method of phosphoric acid is the wet-process phosphoric acid production technology, which will produce a large amount of phosphogypsum in the production process. Obviously, with the rapid development of the phosphorus chemical industry, ...

Claims

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Application Information

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IPC IPC(8): C04B11/26
CPCC04B11/005C04B11/26
Inventor 王家伟王海峰陈雁冰龙召凤李仕玉曾庆果
Owner GUIZHOU UNIV
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