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A kind of modification method of phosphogypsum architectural gypsum product

A technology for building gypsum and building gypsum powder, which is applied in the field of resource utilization of industrial solid waste and preparation of building materials, and can solve problems such as affecting the crystallization habit of dihydrate gypsum, difficulty in effectively utilizing phosphogypsum, and difficulty in resource utilization of phosphogypsum , achieve significant modification effect, solve the effect of low strength of building gypsum and increase of compressive strength

Active Publication Date: 2021-08-10
湖北声荣再生资源利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Gypsum products have the functions of light weight, fire resistance, humidity control, decoration, etc., so they have a very broad application market in the construction field, while phosphogypsum is a solid waste associated with the production of high-concentration phosphate fertilizers, usually based on the dihydrate process , whose main component is CaSO 4 2H 2 O, the mass content is usually above 85%, similar to natural gypsum, but because it contains soluble phosphorus, eutectic phosphorus, organic matter and other impurities, it seriously affects the crystallization habit of dihydrate gypsum when the hemihydrate gypsum prepared from phosphogypsum is hydrated , is the main reason why it is difficult to effectively utilize phosphogypsum in the traditional construction field. Therefore, the resource utilization of phosphogypsum is still a worldwide problem, and it is also one of the key factors restricting the sustainable development of the phosphorus chemical industry.

Method used

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  • A kind of modification method of phosphogypsum architectural gypsum product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh 2000g of phosphogypsum construction gypsum powder, add 20g of 1% quicklime, and mix well;

[0031] (2) Adjust the pH of the process water to 5.0 with sulfuric acid for use;

[0032] (3) The modified material is ferrous chloride, the amount added is 0.5% of the mass of gypsum powder, the water reducer is polycarboxylic acid, and its amount is 0.5% of the mass of gypsum powder, and the amount of retarder bone collagen is 0.5% of the mass of gypsum powder 0.01% of the mass, according to the comparison experiment to predict the water consumption of the standard consistency (based on gypsum powder) and weigh the process water, add the above substances to the process water to dissolve;

[0033] (4) Test the water consumption, initial setting and final setting time of the experimental standard consistency, and then prepare the test piece and measure the 2h and absolute dry strength. The results are shown in Table 2.

[0034] Table 2 Physical property test results of...

Embodiment 2

[0037] (1) Weigh 2000g of phosphogypsum construction gypsum powder, add 40g of 2% quicklime, and mix well;

[0038] (2) Adjust the pH of the process water to 3.0 with hydrochloric acid for use;

[0039] (3) The modified material is ferrous nitrate and aluminum chloride, the mass ratio of the two added is 1:2, the total amount added is 3.0% of the mass of gypsum powder, the water reducer is calcium lignosulfonate, and the amount is gypsum 0.1% of the mass of the powder, and the amount of coagulin added as the retarder is 0.1% of the mass of the gypsum powder. According to the comparison experiment, the water consumption of the standard consistency is predicted (based on the gypsum powder) and the process water is weighed, and the above substances are added to the process water to dissolve;

[0040] (4) Test the water consumption, initial setting and final setting time of the experimental standard consistency, and then prepare the test piece and measure the 2h and absolute dry str...

Embodiment 3

[0044] (1) Weigh 2000g of phosphogypsum construction gypsum powder, add 60g of 3% quicklime, and mix well;

[0045] (2) Adjust the pH of the process water to 4.0 with nitric acid for use;

[0046] (3) The modified material is ferrous sulfate and aluminum sulfate, the mass ratio of the two added is 1:1, the total amount added is 2.0% of the mass of gypsum powder, and the water reducer is polycarboxylic acid, the amount of which is 2.0% of the mass of gypsum powder 0.3%, the amount of gelatin added as retarder is 0.05% of the mass of gypsum powder, according to the comparison experiment, the water consumption of standard consistency is predicted (based on gypsum powder) and the process water is weighed, and the above substances are added to the process water to dissolve;

[0047] (4) Test the water consumption, initial setting and final setting time of the experimental standard consistency, and then prepare the test piece and measure the 2h and absolute dry strength. The results...

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Abstract

The invention relates to a method for modifying phosphogypsum architectural gypsum products, comprising the following steps: (1) mixing phosphogypsum architectural gypsum powder with quicklime; (2) adjusting the pH of process water to 3-5, adding modified materials, Water reducer, retarder; (3) Measure the water consumption of standard consistency and initial setting and final setting time when different additives are dissolved; (4) Weigh the mixture prepared in step (1) and add it to the modified material , water reducer, and retarder in standard consistency water to prepare test pieces; (5) Measure the 2h and absolute dry strength of the product. The method can effectively improve the strength of gypsum products, improve the performance of building gypsum powder produced from phosphogypsum, and provide a feasible technical method for phosphogypsum building gypsum products.

Description

technical field [0001] The invention relates to a method for modifying phosphogypsum architectural gypsum products, and belongs to the technical fields of resource utilization of industrial solid waste and preparation of building materials. Background technique [0002] Gypsum products have the functions of light weight, fire resistance, humidity control, decoration, etc., so they have a very broad application market in the construction field, while phosphogypsum is a solid waste associated with the production of high-concentration phosphate fertilizers, usually based on the dihydrate process , whose main component is CaSO 4 2H 2 O, the mass content is usually more than 85%, similar to natural gypsum, but because it contains soluble phosphorus, eutectic phosphorus, organic matter and other impurities, it seriously affects the crystallization habit of dihydrate gypsum when the hemihydrate gypsum prepared from phosphogypsum is hydrated , is the main reason why phosphogypsum ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14
CPCC04B28/143C04B2111/00991C04B2201/50C04B22/064C04B22/141C04B22/12C04B24/24C04B24/14C04B22/085C04B24/18C04B22/148
Inventor 夏举佩韩跃伟
Owner 湖北声荣再生资源利用有限公司