Waterproof phosphogypsum building block and preparation method thereof

A technology of hemihydrate phosphogypsum and phosphogypsum, which is applied in the field of material science, can solve the problems of narrow application range and limit the application of phosphogypsum blocks, and achieve the effects of low cost, simple and easy raw material addition process, and wide source of materials

Active Publication Date: 2017-06-13
GUIZHOU LANTU NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the water absorption rate of phosphogypsum blocks on the market is about 30%, and most of them can only be used for building interior walls. Due to their high water absorption rate and narrow application range, the application of phosphogypsum blocks is greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 of the present invention: the preparation of waterproof phosphogypsum block, take 300ml water to dissolve 5g polyvinyl alcohol with measuring cylinder, take 100ml water to dilute 0.5g organosilicon hydrogen-containing emulsion with measuring cylinder, weigh 520g and a half with electronic balance Water gypsum, gray calcium powder 5g, P O42.5R cement 10g, crystal modifier 10g, 600 mesh hollow glass microspheres 5g, naphthalene-based water reducer 1g, salt water-repellent 0.5g (NaCl 0.2g, KCl 0.3g ), 0.5g of sodium lauryl sulfate and mixed evenly, pour the above components into a stirrer and stir for 2min to form a slurry, pour the slurry into a mould, obtain a phosphogypsum block blank after hardening, and release the mould, under natural conditions Maintain until the moisture content is below 8%, the measured initial setting time is 4min, the final setting time is 8min, the 2h flexural strength is 8MPa, the 2h compressive strength is 10MPa, the 2h water abso...

Embodiment 2

[0023] Embodiment 2: the preparation of waterproof phosphogypsum block, take 300ml water to dissolve 8g polyvinyl alcohol with measuring cylinder, take 100ml water to dilute 0.8g organosilicon hydrogen-containing emulsion with measuring cylinder, weigh 520g hemihydrate gypsum with electronic balance, Ash calcium powder 10g, P O42.5R cement 15g, crystal modifier 10g, 600-mesh hollow glass microspheres 10g, naphthalene-based superplasticizer 2g, salt water-repellent 1g (NaCl0.3g, KCl 0.3g, NaNO 2 0.4g), sodium lauryl sulfate 0.4g, sodium dodecylsulfonate 0.4g, mix evenly, pour the above components into the mixer and stir for 2min to form a slurry, pour the slurry into the mold, after hardening Obtain the phosphogypsum block blank, release the mold, and maintain it under natural conditions until the moisture content reaches below 8%. The measured initial setting time is 3 minutes, the final setting time is 7 minutes, the flexural strength is 10 MPa in 2 hours, the compressive str...

Embodiment 3

[0024] Example 3: Preparation of waterproof phosphogypsum block. Dissolve 10 g of polyvinyl alcohol in 300 ml of water with a graduated cylinder, dilute 1 g of silicone hydrogen-containing emulsion with 100 ml of water with a graduated cylinder, and weigh 520 g of hemihydrate gypsum with an electronic balance. Calcium powder 15g, P O42.5R cement 20g, crystal modifier 10g, 600-mesh hollow glass microspheres 15g, naphthalene-based water reducer 2.5g, salt water-repellent 1.2g (NaCl 0.4g, KCl 0.4g, NaNO 2 0.4g), sodium lauryl sulfate 0.5g, sodium dodecylsulfonate 0.5g, mix evenly, pour the above components into the mixer and stir for 2min to form a slurry, pour the slurry into the mold, after hardening Obtain the phosphogypsum block blank, release the mold, and maintain it under natural conditions until the moisture content reaches below 8%. The measured initial setting time is 4 minutes, the final setting time is 8 minutes, the flexural strength is 12MPa in 2 hours, the compress...

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Abstract

The invention discloses a waterproof phosphogypsum building block and a preparation method thereof. The waterproof phosphogypsum building block comprises 50-60 parts by weight of semi-aqueous phosphogypsum, 30-40 parts by weight of water, 1-3 parts by weight of ash calcium powder, 2-5 parts by weight of cement, 3-7 parts by weight of a crystal modifier, 1-3 parts by weight of polyvinyl alcohol, 1-5 parts by weight of glass microspheres, 0.1-0.3 part by weight of a high efficiency water reducing agent, 0.05-0.5 part by weight of organic silicone oil emulsion, 0.1-0.3 part by weight of a salt waterproof agent and 0.05-0.1 part by weight of an air entraining agent. The waterproof phosphogypsum building block has the beneficial effects that the ash calcium powder serves as an initiating agent; the cement and the semi-aqueous phosphogypsum harden with water; the glass microspheres have enhancement and filling effects; the salt waterproof agent, the polyvinyl alcohol and the organic silicone oil emulsion are mixed waterproof agents. The waterproof phosphogypsum building block has the advantages that the production is simple; special production equipment is not needed; the process is reasonable; a raw material adding working procedure is simple and practicable; the prepared phosphogypsum building block is a gypsum building block with high strength and low water absorption.

Description

technical field [0001] The invention relates to the field of material science, in particular to a waterproof phosphogypsum block and a preparation method thereof. Background technique [0002] Phosphogypsum is a solid waste produced in the phosphoric acid industry. At present, the production of phosphogypsum in my country is 80 million tons, resulting in a large amount of phosphogypsum being piled up idle. Phosphogypsum contains a small amount of undecomposed phosphate rock, free phosphoric acid, fluoride, etc. A kind of impurity that is harmful to the environment poses a great threat to the ecological environment. During the "12th Five-Year Plan" period, the annual comprehensive utilization rate of phosphogypsum in my country was 30.3%, and it is estimated that the annual comprehensive utilization rate of phosphogypsum in my country during the "13th Five-Year Plan" period was 40%. Therefore, the development and application market prospects of phosphogypsum products are broad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14E04C1/00C04B111/27
CPCC04B28/143C04B2111/00017C04B2111/27C04B2201/20C04B2201/50E04C1/00C04B24/2623C04B24/42C04B22/064C04B7/02C04B14/22C04B22/124C04B24/163C04B2103/302C04B2103/0068C04B20/002C04B20/008C04B22/085
Inventor 陈小平陈洋杨再祥严国辉雷勇
Owner GUIZHOU LANTU NEW MATERIALS
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