A kind of phosphogypsum-based aggregate and preparation method thereof

A technology of phosphogypsum and aggregates, which is applied in the field of phosphogypsum-based aggregates and its preparation, can solve the problems of low strength and long maintenance period, and achieve the effects of improving early strength, short maintenance period and improving cohesion

Active Publication Date: 2022-08-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, provide a phosphogypsum-based aggregate and its preparation method, and solve the technical problems of long maintenance period and low strength of the phosphogypsum-based aggregate in the prior art

Method used

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  • A kind of phosphogypsum-based aggregate and preparation method thereof
  • A kind of phosphogypsum-based aggregate and preparation method thereof
  • A kind of phosphogypsum-based aggregate and preparation method thereof

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preparation example Construction

[0036] This specific embodiment also proposes a preparation method of the above-mentioned phosphogypsum-based aggregate, comprising the following steps:

[0037] 1) According to the distribution ratio of each component, phosphogypsum, slag powder and alkaline activator are mixed to obtain A powder;

[0038] 2) adding sodium hexametaphosphate and cellulose ether into water and dissolving to obtain B solution;

[0039] 3) The A powder obtained in step 1) is put into the ball forming machine, and at the same time, the B solution is continuously sprayed into the ball forming machine to be mixed with the A powder, and the ball is formed to obtain aggregate; the running speed of the ball mill is 10r / min-40r / min;

[0040] 4) After the aggregate is naturally stacked and solidified for 1-2 days, the phosphogypsum-based aggregate is obtained by soaking in water for curing; the soaking and curing can be the curing of the cured aggregate in normal temperature water for 14-28 days; The ...

Embodiment 1

[0047] This embodiment proposes an early-strength phosphogypsum-based aggregate, which is prepared by mixing A powder and B solution into a ball; the A powder is calculated by mass percentage, including: 80% of phosphogypsum, 15% of slag powder, Portland cement clinker 4%, quicklime 1%;

[0048] The B solution is calculated by mass percentage, including 1% sodium hexametaphosphate, 0.1% cellulose ether, and the rest is water, totaling 100%;

[0049] The mass of the B solution is 25% of the mass of the A powder.

[0050] The present embodiment also proposes a method for preparing the above-mentioned phosphogypsum-based aggregate, comprising the following steps:

[0051] 1) according to the distribution ratio of each component, phosphogypsum, slag powder, Portland cement clinker and quicklime are mixed to obtain A powder;

[0052] 2) adding sodium hexametaphosphate and cellulose ether into water and dissolving to obtain B solution;

[0053] 3) The A powder obtained in step 1)...

Embodiment 2

[0058] This embodiment proposes an early-strength phosphogypsum-based aggregate, which is prepared by mixing A powder and B solution into spheres; the A powder is calculated by mass percentage, including: 70% of phosphogypsum, 10% of slag powder, Coal ash powder 10%, Portland cement clinker 4%, sodium hydroxide 0.5%, sodium aluminate 0.5%;

[0059] The B solution is calculated by mass percentage, including 1% sodium hexametaphosphate, 0.1% cellulose ether, and the rest is water, totaling 100%;

[0060] The mass of the B solution is 30% of the mass of the A powder.

[0061] The present embodiment also proposes a method for preparing the above-mentioned phosphogypsum-based aggregate, comprising the following steps:

[0062] 1) according to the proportion of each component, phosphogypsum, slag powder, Portland cement clinker, sodium hydroxide and sodium aluminate are mixed to obtain A powder;

[0063] 2) adding sodium hexametaphosphate and cellulose ether into water and dissolv...

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Abstract

The invention discloses a phosphogypsum-based aggregate and a preparation method thereof, belonging to the technical field of road building materials. The phosphogypsum-based aggregate is prepared by mixing A powder and B solution into a ball; the A powder includes: 50%-80% of phosphogypsum, 15%-45% of waste residue powder, and 3%- of alkaline activator 6%; the solution B includes sodium hexametaphosphate 1%-2%, cellulose ether 0.1%-0.2%, and the rest is water. The preparation method includes: 1) mixing phosphogypsum, slag powder, and alkaline activator to obtain A powder; 2) adding sodium hexametaphosphate and cellulose ether to water to dissolve to obtain B solution; 3) preparing step 1) The obtained A powder is put into the pelletizing machine, and the B solution is continuously sprayed into the pelletizing machine to be mixed with the A powder, and the pellets are formed to obtain aggregates; 4) after the aggregates are solidified, water immersion curing is performed to obtain the described aggregates. Phosphogypsum based aggregates. The invention realizes short curing period and high strength of phosphogypsum-based aggregate.

Description

technical field [0001] The invention relates to the technical field of road building materials, in particular to a phosphogypsum-based aggregate and a preparation method thereof. Background technique [0002] Phosphogypsum is a solid waste residue produced in the process of industrial production of phosphoric acid, and its main component is calcium sulfate dihydrate (Ca. 2 SO 4 ·2H 2 O), in addition to a variety of other impurities. The data show that for every ton of phosphoric acid produced (in terms of P 2 O 5 At the same time, 4.5-5 tons of phosphogypsum (calculated on a dry basis of dihydrate gypsum) will be produced. The annual output of phosphogypsum in my country is about 35 million tons, and the cumulative displacement is 100 million tons. The output is equivalent to the annual output of natural gypsum. A large amount of waste residues accumulate to form a phosphogypsum yard, which not only occupies arable land, but also pollutes the environment. At present, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/12C04B20/12C04B14/36C04B18/14
CPCC04B28/12C04B20/12C04B14/365C04B18/141C04B2111/00017C04B2201/20C04B20/107C04B20/1048C04B20/0016C04B20/1051C04B7/02Y02W30/91
Inventor 刘刚邢宏源曹庭维管彬黄傲肖月梁杨实
Owner WUHAN UNIV OF TECH
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