Modified phosphogypsum and its preparation method

A phosphogypsum and modification technology, applied in the field of phosphogypsum, can solve problems such as low utilization rate, groundwater pollution, impurity cracking, etc.

Active Publication Date: 2021-09-14
胡瑾 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, 1 ton of phosphoric acid is produced by wet method, and 4.5 to 5.5 tons of phosphogypsum are produced. The quantity is very large, but the utilization rate is very low.
[0006] 3) The large discharge of phosphogypsum not only occupies a large amount of land, but also because phosphogypsum is soaked in rainwater for a long time, the soluble P and F in it are transferred to the environment through water as a medium, which will cause pollution of soil, water system and air
[0008] At present, when it is usually used as building materials such as building materials and boards, it will easily cause cracking due to impurities that are difficult to handle; at the same time, the stacking of phosphogypsum will pollute groundwater.

Method used

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  • Modified phosphogypsum and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Modified phosphogypsum, including CaSO 4 and CaCO 3 ; where CaSO 4 The mass percentage content is 84%, CaCO 3 The mass percentage content is 15%, and the remaining components are 1%; and the modified phosphogypsum is also added with clay with a mass percentage content of 30%.

[0042] The modified phosphogypsum is prepared by the following method, comprising the following steps:

[0043] S1. Add CaCO to phosphogypsum 3 , and make CaCO 3 The mass percentage content is the final CaCO 3 1 / 2 of the mass percentage content; stirring makes phosphogypsum and CaCO 3 well mixed;

[0044] S2, dehydrate the phosphogypsum, and the dehydration temperature is 150°C;

[0045] S3, stirring and crushing the phosphogypsum to powder;

[0046] S4, and then to the mixed phosphogypsum and CaCO 3 Add CaCO 3 ; and make CaCO 3 The mass percentage content is 15%; stir and mix evenly;

[0047] S5, in step S4, phosphogypsum and CaCO 3 After mixing uniformly, clay was added to the mi...

Embodiment 2

[0049] Modified phosphogypsum, including CaSO 4 and CaCO 3 ; where CaSO 4 The mass percentage content is 94%, CaCO 3The mass percentage content is 4%, and the remaining components are 1%; and clay with a mass percentage content of 50% is added to the modified phosphogypsum.

[0050] The system of described modified phosphogypsum comprises the following steps:

[0051] S1, adding CaCO to phosphogypsum 3 , and makes CaCO 3 The mass percentage content is the final CaCO 3 One-half of the mass percentage content; stirring makes phosphogypsum and CaCO 3 well mixed;

[0052] S2, dehydrating the phosphogypsum, the dehydration temperature is 180°C;

[0053] S3, stirring and crushing the phosphogypsum into powder;

[0054] S4, then to the mixed phosphogypsum and CaCO 3 CaCO 3 ; and make CaCO 3 The mass percentage content is 5%; stir and mix evenly;

[0055] S5, in step S4, phosphogypsum and CaCO 3 After mixing evenly, clay is added to the mixture so that the mass percenta...

Embodiment 3

[0057] Modified phosphogypsum, including CaSO 4 and CaCO 3 ; where CaSO 4 The mass percentage content is 89%, CaCO 3 The mass percentage content is 10%, and the remaining components are 1%; and clay with a mass percentage content of 80% is added to the modified phosphogypsum.

[0058] The system of described modified phosphogypsum comprises the following steps:

[0059] S1, adding CaCO to phosphogypsum 3 , and makes CaCO 3 The mass percentage content is the final CaCO 3 One-half of the mass percentage content; stirring makes phosphogypsum and CaCO 3 well mixed;

[0060] S2, dehydrating the phosphogypsum, the dehydration temperature is 200°C;

[0061] S3, stirring and crushing the phosphogypsum into powder;

[0062] S4, then to the mixed phosphogypsum and CaCO 3 CaCO 3 ; and make CaCO 3 The mass percentage content is 10%; stir and mix evenly;

[0063] S5, in step S4, phosphogypsum and CaCO 3 After mixing evenly, clay is added to the mixture so that the mass perce...

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Abstract

The invention discloses a modified phosphogypsum capable of avoiding environmental pollution caused by phosphogypsum produced in the phosphoric acid or phosphate fertilizer industry, and capable of using the phosphogypsum for roadbed materials, turning waste into treasure and a preparation method thereof. The modified phosphogypsum, including 84% to 94% CaSO 4 and 5% to 15% CaCO 3 . The preparation method of the modified phosphogypsum comprises steps, S1, dehydrating the phosphogypsum, the dehydration temperature is 150°C to 200°C; S2, stirring and breaking the phosphogypsum into powder; S3, air cooling the dehydrated phosphogypsum to room temperature ; then add CaCO to the phosphogypsum 3 , and makes CaCO 3 The mass percentage content is 3%; stirring makes phosphogypsum and CaCO 3 Mix well; S4, then to the mixed phosphogypsum and CaCO 3 CaCO 3 ; and make CaCO 3 The mass percentage content is 5% to 15%; stir and mix evenly. The modified phosphogypsum prepared by the modified phosphogypsum preparation method is used as a roadbed material, which can save land and avoid environmental pollution.

Description

technical field [0001] The invention relates to phosphogypsum, in particular to a modified phosphogypsum and a preparation method thereof. Background technique [0002] Here, phosphogypsum: refers to the solid waste residue produced when phosphate rock is treated with sulfuric acid in the production of phosphoric acid, and its main component is calcium sulfate. The main components of phosphogypsum are: CaSO 4 2H2O, in addition to a variety of other impurities. [0003] Phosphogypsum is generally in the form of powder, and its appearance is generally gray, gray, yellow, light green and other colors. It also contains organic phosphorus and sulfur-fluorine compounds. Its bulk density is 0.733-0.88g / cm3, and its particle diameter is generally 5-15um. The content of calcium sulfate dihydrate can generally reach about 70 to 90%, and the secondary components contained in it vary with the origin of phosphate rock. Generally, it contains phosphates and silicates of rock components ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/04C04B11/26C04B11/00
CPCC04B11/005C04B11/26C04B40/0039C04B18/0445C04B14/28C04B14/10Y02W30/91
Inventor 胡瑾
Owner 胡瑾
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