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High-strength and water-resistant phosphogypsum-based composite cementing material and preparation method thereof

A technology of composite cementitious material and phosphogypsum, which is applied in the field of water-resistant phosphogypsum-based composite cementitious material and its preparation, can solve the problems that the strength cannot reach the load-bearing structure, the pretreatment process is cumbersome, and the content of phosphogypsum is small, and the drying effect is achieved. The effect of less baking time, simple and environmentally friendly production process and low price

Pending Publication Date: 2020-06-26
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional gypsum has the advantages of light weight, sound insulation, and thermal insulation, but its application range is limited due to its low strength and poor water resistance.
In order to solve this problem, the researchers mixed the phosphogypsum with other admixtures after pretreatment, and mixed with other activators to form a phosphogypsum-based composite cementitious material with a certain strength, but the product phosphogypsum mixed with Small amount, long coagulation time, low strength, poor water resistance, and cumbersome pretreatment process
There are also researchers who dehydrate phosphogypsum to form hemihydrate gypsum, which makes it gelatinous. Although the strength has been improved, the dehydration process has problems such as energy consumption, high cost, complicated process, and environmental pollution. At the same time, part of the strength is still not up to the requirements of the load-bearing structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1. A high-strength, water-resistant phosphogypsum-based composite cementitious material is prepared from the following raw materials in parts by weight:

[0039] Phosphogypsum: 94 parts, lime calcium powder: 6 parts,

[0040] Cement: 9 parts, Water reducer: 0.6 parts,

[0041] Retarder: 0.3 parts.

[0042] The aforementioned high-strength, water-resistant phosphogypsum-based composite cementitious material is prepared by mixing phosphogypsum, lime calcium powder, cement, water-reducing agent, and setting retarder according to the stated proportions and then mixing them well. After stirring, the raw materials are evenly distributed in the mixing container; then add water to stir, when stirring, first stir at low speed for 40-70S, and then stir at high speed for 60-90S; add water to make the slurry consistency reach 190±5mm. The consistency test method meets the requirements of GB / T17669.4-1999 "Determination of Physical Properties of Building Gypsum Clean Slur...

Embodiment 2

[0049] Example 2. The difference between this example and Example 1 is that the phosphogypsum is obtained by passing through a 0.315 mm square hole sieve and then baking at 140° C. for 2 hours. The measured compressive strength after hardening for 3 days was 45.25MPa, and the flexural strength was 6.32MPa.

Embodiment 3

[0050] Example 3. The difference between this example and Example 1 is that the phosphogypsum is obtained by passing through a 0.315 mm square hole sieve and then baking at 120° C. for 2 hours. The measured compressive strength after hardening for 3 days was 41.13MPa, and the flexural strength was 5.53MPa.

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Abstract

The invention discloses a high-strength and water-resistant phosphogypsum-based composite cementing material and a preparation method thereof. The high-strength and water-resistant phosphogypsum-basedcomposite cementing material is prepared from the following raw materials in parts by weight: 88-99 parts of phosphogypsum, 1-12 parts of ash calcium powder, 4-15 parts of cement, 0.1-1 part of a water reducing agent and 0.1-1 part of a retarder. According to the invention, the production energy consumption of the phosphogypsum-based cementing material is reduced, the strength and the water resistance of the phosphogypsum-based cementing material are improved, the cost is low, resources are saved, and the comprehensive utilization rate of phosphogypsum is increased.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of phosphogypsum, in particular to a high-strength, water-resistant phosphogypsum-based composite gelling material and a preparation method thereof. Background technique [0002] Phosphogypsum is an industrial by-product of wet process production of phosphoric acid. At present, the annual production of phosphogypsum in the world exceeds 300 million tons, and the comprehensive utilization rate of overall resources is about 10%. The annual emission of phosphogypsum in my country is nearly 80 million tons, and the cumulative stockpiles exceed 500 million tons. At the same time, a large number of irregularly stockpiled phosphogypsum in the upper reaches of the Yangtze River has become a major source of land and water pollution, and the stockpiling of phosphogypsum will also bring high storage yard construction and operation and maintenance costs to phosphorus chemical enterprises. T...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B111/27
CPCC04B28/143C04B2111/00017C04B2111/27C04B2201/50C04B22/064C04B7/02C04B2103/302C04B2103/22
Inventor 孔德文罗双付汝宾王玲玲
Owner GUIZHOU UNIV