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Hydrophobic phosphogypsum, and preparation method and application thereof

A phosphogypsum, hydrophobic technology, applied in the field of phosphogypsum, can solve the problems of occupying land, polluting the environment, complex modification process, etc.

Active Publication Date: 2010-09-29
WENGFU (GRP) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the above research status and level of phosphogypsum at home and abroad, it can be seen that the application of phosphogypsum is mainly concentrated in the cement industry and gypsum construction industry. These traditional applications are far from the current situation of the annual output of tens of millions of tons of by-product phosphogypsum Far from being enough, a large amount of phosphogypsum is piled up as waste, which not only occupies land but also seriously pollutes the environment
The traditional process of pretreatment and modification of phosphogypsum is complicated, but it does not change its strong hydrophilicity. The utilization of phosphogypsum should be considered from multiple aspects and multiple uses

Method used

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  • Hydrophobic phosphogypsum, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Grind 10 g of solid waste-phosphogypsum to 100 μm, add it into deionized water, stir evenly, adjust the pH value to 7.5 with sodium hydroxide solution, heat to 80 ° C, react for 10 min, and suction filter while it is hot. After drying at 60°C, the activation index is 5%. It can be seen that the hydrophobic performance of phosphogypsum without hydrophobic modifier is very low.

Embodiment 2

[0045] Example 2: Take 10g of phosphogypsum and grind it to 500 μm for later use; another 0.05g of stearic acid solid is dissolved in deionized water to make a hydrophobic modifier solution with a mass percentage of 0.5%, and the pH value is adjusted with potassium hydroxide solution If it is 7, add phosphogypsum powder, heat to 80°C, react for 10 minutes, suction filter while hot, and dry the filter residue at 60°C to obtain hydrophobic phosphogypsum. The activation index is 40%.

Embodiment 3

[0046] Example 3: Take 10g of phosphogypsum and pulverize it to 0.1 μm for later use; another 0.05g of stearic acid solid is dissolved in deionized water to make a hydrophobic modifier solution with a mass percentage of 0.1%, and the pH is adjusted with potassium hydroxide solution When the value is 7.5, add phosphogypsum powder, heat to 80°C, react for 10 minutes, suction filter while hot, and dry the filter residue at 60°C to obtain hydrophobic phosphogypsum. The activation index is 45%.

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Abstract

The invention discloses hydrophobic phosphogypsum, and a preparation method and application thereof. The hydrophobic phosphogypsum is prepared from phosphogypsum and a hydrophobic modifying agent. The preparation method comprises the following steps of: dissolving the hydrophobic modifying agent into solvent to produce the solution of the hydrophobic modifying agent; adding the phosphogypsum intothe solution; stirring the solution uniformly; reacting under a heating condition; pumping and filtering the solution when the solution is hot; and drying filter residue to obtain the hydrophobic phosphogypsum. The hydrophobic phosphogypsum can be used as inorganic filler applied to polymer. Compared with the prior art, the hydrophobic phosphogypsum has hydrophobic property due to the hydrophobicmodifying agent and is dispersed in the polymer highly and modifies the polymer by serving as the inorganic filler due to the hydrophobic property; the preparation method has the advantages of simpleness, easily-controlled technological parameters, readily available raw materials and low preparation cost; and the application way of the solid waste phosphogypsum is expanded and the modifying cost of the polymer is reduced.

Description

technical field [0001] The invention relates to the technical field of phosphogypsum, in particular to a hydrophobic phosphogypsum and its preparation method and application. Background technique [0002] Phosphogypsum is the solid waste produced during the extraction of phosphoric acid from apatite concentrate, and is a bulk waste in the chemical industry. Produce 1 ton of P 2 o 5 About 4.25-5.66 tons of phosphogypsum will be produced. According to statistics, the infrastructure investment required to store these waste residues is about 18% of the investment of the entire extraction phosphoric acid plant, and the operating cost is 12% of the raw material price. The area occupied by phosphogypsum is sometimes larger than the area of ​​the plant. The main component of phosphogypsum is dihydrate gypsum, and there are some soluble and insoluble impurities in phosphogypsum such as P 2 o 5 and F, etc., causing serious harm to the environment. [0003] The current main direc...

Claims

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Application Information

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IPC IPC(8): C04B11/26
CPCC04B11/26C04B2103/65
Inventor 秦军金翠霞于杰解田杨丽萍秦舒浩
Owner WENGFU (GRP) CO LTD
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