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A preparation method of phosphogypsum composite early strength agent for sulphoaluminate cement

A technology of sulphoaluminate cement and composite early strength agent, which is applied in the field of concrete admixture and solid waste utilization, can solve the problems that sulphoaluminate cement cannot meet the requirements, achieve high hourly strength, simple process flow, and reasonable resources The effect of using

Active Publication Date: 2022-04-01
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 6h strength of normal sulphoaluminate cement is generally 6-15MPa. For the rapid hardening sulphoaluminate cement whose maximum strength is above 20MPa in hours (such as 4h), the normal production of sulphoaluminate cement can no longer meet the requirements. Require

Method used

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  • A preparation method of phosphogypsum composite early strength agent for sulphoaluminate cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1, in parts by weight, take 120 parts of phosphogypsum dihydrate, 450 parts of water, 1 part of polycarboxylate water reducing agent and 1300 parts of zirconia grinding bodies and pour them into a planetary ball mill tank simultaneously, and the planetary ball mill tank Sealed and fixed in a planetary ball mill, ground to a median particle size of 5 μm and an effective solid content of 16%, take 100 parts of the ground slurry and transfer it to a three-necked flask, add 5 parts of lithium carbonate and 4 parts of cyclodextrin, The phosphogypsum composite early-strength agent was obtained through the process of decompression and heat circulation for 1h;

[0020] The zirconia grinding body is formed by mixing grinding balls of various particle sizes, the diameter and mass ratio of which are 3mm:1.5mm:1mm:0.5mm=4:2:1:2, and the rotational speed of the ball mill is 400rpm.

[0021] The composite early strength agent prepared in this example is mixed into sulfoalumin...

Embodiment 2

[0022] Example 2, in parts by weight, take 125 parts of phosphogypsum dihydrate, 500 parts of water, 1.2 parts of polycarboxylate water reducing agent and 1400 parts of zirconia grinding bodies and pour them into a planetary ball mill tank simultaneously. Sealed and fixed in a planetary ball mill, ground to a median particle size of 5.5 μm and an effective solid content of 15%. Transfer 100 parts of the ground slurry to a three-necked flask, add 6 parts of lithium carbonate and 4.5 parts of cyclodextrin , the phosphogypsum composite early-strength agent is obtained through the process of decompression and heat circulation for 1.2h;

[0023] The zirconia grinding body is formed by mixing grinding balls of various particle sizes, the diameter and mass ratio of which are 3mm:1.5mm:1mm:0.5mm=4:2:1:2, and the rotational speed of the ball mill is 400rpm.

[0024] The composite early-strength agent prepared in this example is mixed into the sulfoaluminate cement at a dosage of 2%, an...

Embodiment 3

[0025] Example 3, in parts by weight, take 135 parts of phosphogypsum dihydrate, 550 parts of water, 1.5 parts of polycarboxylate water reducing agent and 1600 parts of zirconia grinding bodies and pour them into a planetary ball mill tank simultaneously. Sealed and fixed in a planetary ball mill, ground to a median particle size of 6 μm and an effective solid content of 14%, take 100 parts of the ground slurry and transfer it to a three-necked flask, add 7 parts of lithium carbonate and 4.8 parts of cyclodextrin, The phosphogypsum composite early-strength agent was obtained through the process of decompression and heat circulation for 1.2h;

[0026] The zirconia grinding body is formed by mixing grinding balls of various particle sizes, the diameter and mass ratio of which are 3mm:1.5mm:1mm:0.5mm=4:2:1:2, and the rotational speed of the ball mill is 400rpm.

[0027] The composite early-strength agent prepared in this example was mixed into sulfoaluminate cement at a dosage of...

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Abstract

The invention provides a method for preparing a phosphogypsum composite early-strength agent for sulphoaluminate cement. In parts by weight, 100-150 parts of phosphogypsum dihydrate, 450-750 parts of water, and polycarboxylate superplasticizer 1-2 parts and 1300-1800 parts of zirconia grinding bodies are added to the planetary ball mill tank at the same time, sealed and fixed in the planetary ball mill, and ground to a median particle size of 5-8 μm and an effective solid content of 14-18%. 5-10 parts of lithium carbonate and 4-6 parts of cyclodextrin are added to the ground slurry, and the phosphogypsum composite early strength agent for sulphoaluminate cement is obtained through the process of decompression heat circulation and reflux for 1-2 hours. The composite early strength agent prepared by the method of the present invention is mixed with sulfoaluminate cement in an amount of 1 to 6%, which can promote the early hydration of sulfoaluminate cement, form ettringite rapidly, shorten the hardening time and The early intensity is increased, and the later intensity has no effect.

Description

technical field [0001] The invention belongs to the field of concrete admixtures and solid waste utilization, in particular to a preparation method of a phosphogypsum composite early-strength agent for sulfoaluminate cement. Background technique [0002] The output of my country's industrial by-product gypsum is quite huge. Today, the cumulative stock of industrial by-product gypsum in my country has exceeded 400 million tons, mainly including: phosphogypsum, desulfurized gypsum, fluorine gypsum and citric acid gypsum, etc. Among them, the annual stockpile of phosphogypsum exceeds 70 million tons, and the comprehensive utilization rate is only about 20%. Phosphogypsum is the waste residue removed by the phosphate fertilizer industry, and it will seriously pollute the environment if it is not treated in time. The large amount of storage wastes resources, occupies land, and causes damage to the environment. It also causes dust pollution and other safety problems when encount...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B103/14
CPCC04B40/0039C04B2103/14C04B22/144C04B22/002C04B22/10C04B24/383
Inventor 苏英江友志彭圣刚陈顺贺行洋付健健李玉博熊国庆刘巧黄震宇毛云
Owner HUBEI UNIV OF TECH
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