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Semi-hydrated and undisturbed phosphogypsum-based composite cementing material and preparation method thereof

A technology of composite cementitious material and phosphogypsum hemihydrate, which is applied in clay preparation equipment, chemical instruments and methods, cement mixing equipment, etc., can solve the problem of low utilization rate of phosphogypsum, high energy consumption, and difficulty in meeting the resource utilization of phosphogypsum And other issues

Inactive Publication Date: 2021-05-28
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, cement, slag powder, fly ash and other cementitious materials are mainly used to solidify the original phosphogypsum to form a composite cementitious material, to improve the particle structure of phosphogypsum through ball mill pretreatment, to neutralize the acidic impurities of phosphogypsum in chemical pretreatment, and to extrude Or autoclaving and other methods, the phosphogypsum-based composite cementitious materials prepared by various methods have excellent physical and mechanical properties, but most of the research programs still have defects such as low utilization rate of phosphogypsum, complicated preparation process, high energy consumption, etc., and it is difficult to meet the requirements of phosphorus The goal of large-scale, high value-added resource utilization of gypsum

Method used

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  • Semi-hydrated and undisturbed phosphogypsum-based composite cementing material and preparation method thereof
  • Semi-hydrated and undisturbed phosphogypsum-based composite cementing material and preparation method thereof
  • Semi-hydrated and undisturbed phosphogypsum-based composite cementing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: A semi-hydrated and undisturbed phosphogypsum-based composite cementitious material, the main raw material: the mixing ratio of the gypsum-based composite cementitious material is undisturbed phosphogypsum: hemihydrated phosphogypsum=90:10.

[0032] The undisturbed phosphogypsum has the phenomenon of agglomeration and agglomeration. In this embodiment, it is naturally air-dried to a moisture content of 8.9%, crushed by a 5mm sieve crusher, and further passed through a 0.315mm square hole sieve. The main component CaSO 4 2H 2 O.

[0033] The hemihydrate phosphogypsum is prepared by baking the undisturbed phosphogypsum in an oven at 160°C for 2 hours, and then naturally cooling to room temperature. The main component is CaSO 4 0.5H 2 O and a small part of CaSO 4 .

Embodiment 2

[0034] Example 2: A hemihydrate and original phosphogypsum-based composite gelling material, the main raw material: the mixing ratio of the phosphogypsum-based composite gelling material is original phosphogypsum:hemihydrate phosphogypsum=70:30.

[0035] The undisturbed phosphogypsum has the phenomenon of agglomeration and agglomeration. In this embodiment, it is naturally air-dried to a moisture content of 8.9%, crushed by a 5mm sieve crusher, and further passed through a 0.315mm square hole sieve. The main component CaSO 4 2H 2 O.

[0036] The hemihydrate phosphogypsum is prepared by baking the undisturbed phosphogypsum in an oven at 160°C for 2 hours, and then naturally cooling to room temperature. The main component is CaSO 4 0.5H 2 O and a small part of CaSO 4 .

Embodiment 3

[0037] Example 3: A semi-hydrated and original phosphogypsum-based composite gelling material, the main raw material: the mixing ratio of the phosphogypsum-based composite gelling material is original phosphogypsum: hemihydrate phosphogypsum=50:50.

[0038]The undisturbed phosphogypsum has the phenomenon of agglomeration and agglomeration. In this embodiment, it is naturally air-dried to a moisture content of 8.9%, crushed by a 5mm sieve crusher, and further passed through a 0.315mm square hole sieve. The main component CaSO 4 2H 2 O.

[0039] The hemihydrate phosphogypsum is prepared by baking the undisturbed phosphogypsum in an oven at 160°C for 2 hours, and then naturally cooling to room temperature. The main component is CaSO 4 0.5H 2 O and a small part of CaSO 4 .

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Abstract

The invention discloses a semi-hydrated and undisturbed phosphogypsum-based composite cementing material and a preparation method thereof. The material comprises main raw materials and additives, wherein the main raw materials comprise undisturbed phosphogypsum and semi-hydrated phosphogypsum; the additives comprise a water reducing agent and a retarder. The method has the characteristics of high phosphogypsum utilization rate, excellent material performance, simple process and low cost.

Description

technical field [0001] The invention relates to the technical field of large-volume utilization of original phosphogypsum in resource utilization of phosphogypsum, in particular to a hemihydrate and original phosphogypsum-based composite gelling material and a preparation method thereof. Background technique [0002] Phosphogypsum is a by-product of the phosphate fertilizer and phosphoric acid industries. The data shows that the average annual discharge of phosphogypsum in my country is more than 70 million tons, and the current stockpiles exceed 500 million tons. The annual output and cumulative stockpiles are huge, which poses serious challenges to the ecological environment and the sustainable development of phosphorus chemical enterprises. Therefore, , and its large-scale resource utilization has become an urgent problem to be solved. [0003] The main component of phosphogypsum is calcium sulfate dihydrate (CaSO 4 2H 2 O), itself does not have gelling hydration activi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26C04B28/14B28C5/00
CPCC04B11/26C04B28/143B28C5/003C04B2111/00017C04B2103/302C04B2103/22C04B7/34C04B7/00C04B18/146
Inventor 孔德文付汝宾罗双王玲玲谢浪周银笙苗训付汝松
Owner GUIZHOU UNIV
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