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Phosphogypsum-based aggregate and preparation method thereof

A technology of phosphogypsum and aggregate, which is applied in the field of phosphogypsum-based aggregate and its preparation, and can solve the problems of long curing period and low strength, etc.

Active Publication Date: 2021-09-07
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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  • Phosphogypsum-based aggregate and preparation method thereof
  • Phosphogypsum-based aggregate and preparation method thereof
  • Phosphogypsum-based aggregate and preparation method thereof

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preparation example Construction

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

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

[0038] 2) Dissolving sodium hexametaphosphate and cellulose ether in water to obtain solution B;

[0039] 3) Put the A powder prepared in step 1) into the ball forming machine, and at the same time continuously spray the B solution into the ball forming machine and mix with the A powder to form a ball to obtain the aggregate; the operating speed of the ball mill is 10r / min-40r / min;

[0040] 4) The phosphogypsum-based aggregate is obtained by naturally stacking and solidifying the aggregate for 1-2 days and then soaking in water; the soaking and curing can be performed by placing the cured aggregate in room temperature water for 14-28 days; The water immersion curing may also be to put the sol...

Embodiment 1

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

[0048] The B solution is calculated according to 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] This 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, mix phosphogypsum, slag powder, Portland cement clinker and quicklime to obtain A powder;

[0052] 2) Dissolving sodium hexametaphosphate and cellulose ether in water to obtain solution B;

[0053] 3) Put the A powder obtained in step 1) into the ba...

Embodiment 2

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

[0059] The B solution is calculated according to 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] This embodiment also proposes a method for preparing the above-mentioned phosphogypsum-based aggregate, comprising the following steps:

[0062] 1) According to the distribution ratio of each component, mix phosphogypsum, slag powder, Portland cement clinker, sodium hydroxide and sodium aluminate to obtain A powder;

[0063] 2) Dissolving sodium hexametaphosphate and cellulose ether in water to...

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Abstract

The invention discloses phosphogypsum-based aggregate and a preparation method thereof, and belongs to the technical field of road building materials. The phosphogypsum-based aggregate is prepared by mixing and balling powder A and a solution B; the powder A comprises 50%-80% of phosphogypsum, 15%-45% of waste residue powder and 3%-6% of an alkaline activator; and the solution B comprises 1%-2% of sodium hexametaphosphate, 0.1%-0.2% of cellulose ether and the balance being water. The preparation method comprises the steps: 1) mixing phosphogypsum, slag powder and the alkaline activator to obtain the powder A; 2) adding sodium hexametaphosphate and cellulose ether in water, and dissolving to obtain the solution B; (3) putting the powder A prepared in the step (1) into a ball forming mill, continuously spraying the solution B into the ball forming mill, mixing the solution B with the powder A, and carrying out ball forming to obtain aggregate; and 4) curing the aggregate, soaking in water, and curing to obtain the phosphogypsum-based aggregate. The phosphogypsum-based aggregate is short in curing period and high in strength.

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 the solid waste produced during the industrial production of phosphoric acid, and its main component is calcium sulfate dihydrate (Ca 2 SO 4 2H 2 O), in addition to containing a variety of other impurities. The data shows that for every ton of phosphoric acid produced (in P 2 o 5 In total), 4.5-5 tons of phosphogypsum (calculated on a dry basis of dihydrate gypsum) will be produced at the same time. The annual output of phosphogypsum in my country is about 35 million tons, and the cumulative displacement reaches 100 million tons. The output is equivalent to the annual output of natural gypsum, and it has become the largest amount of industrial by-product gypsum in my country. A large amount of waste residue accumulates to form a phosphogypsum stor...

Claims

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Application Information

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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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