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Sulphoaluminate cement with ardealite as main raw material and preparation method thereof

A technology of sulphoaluminate cement and main raw materials, which is applied in the field of construction cement materials, can solve the problems of low utilization rate of phosphogypsum, achieve low cost, simple preparation process, and promote the formation of minerals

Pending Publication Date: 2022-07-08
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a sulphoaluminate cement with phosphogypsum as the main raw material, use phosphogypsum to replace natural gypsum in large quantities, limit the main mineral content of the raw material and adjust the hydration products AFt and AFm by adding gypsum and regulating minerals and AH 3 The ratio and setting time to meet the preparation requirements of different varieties of sulphoaluminate cement, so as to solve the problem of low utilization rate of phosphogypsum

Method used

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  • Sulphoaluminate cement with ardealite as main raw material and preparation method thereof

Examples

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preparation example Construction

[0037] In a preferred embodiment, the preparation method of the phosphogypsum cement clinker comprises the following steps:

[0038]S1 weighs phosphogypsum, limestone and bauxite by parts by weight, pulverizes, and mixes to prepare phosphogypsum cement raw meal;

[0039] Preferably, in step S1, the grinding is performed until the sieve percentage of the 200-mesh square-hole sieve is less than 8%, and the specific surface area is greater than 400m 2 / kg; when grinding, phosphogypsum, limestone and bauxite can be weighed first and then ground separately, or phosphogypsum, limestone and bauxite can be weighed and ground together; there is no special requirement for the grinding device. Any device known to those skilled in the art can be used, as long as the aforementioned grinding requirements can be met;

[0040] Preferably, in step S1, the specific operation of the mixing is as follows: taking the ground phosphogypsum, limestone and bauxite fine powder, adding water with 5% of...

Embodiment 1

[0049] Weigh 500g of phosphogypsum, 1268g of limestone and 1498g of bauxite, mix and grind to obtain cement raw meal.

[0050] The preparation method of the phosphogypsum sulfoaluminate cement clinker described in the present embodiment is as follows:

[0051] (1) Weigh quantitatively the above-mentioned phosphogypsum, limestone and bauxite and grind them through a 200-mesh square-hole sieve. The percentage of sieve residue is less than 8%, and the specific surface area is greater than 400m 2 / kg, add water with 5% mass of all fine powders, pour it into a ball mill and mix for 10 minutes until uniform, and put the slurry into a 40°C oven to dry for 10 minutes.

[0052] (2) Add about 10% water to the obtained raw meal after mixing and press it into a test cake with a mold, put it into a high temperature furnace for calcination, and the calcination temperature is 1250°C. After the calcination is completed, the cooling rate is 5-10°C / min, cooled to room temperature, and then the...

Embodiment 2

[0054] Weigh 660g of phosphogypsum, 1247g of limestone and 1427g of bauxite and mix and grind to obtain cement raw meal.

[0055] The preparation method of the sulfoaluminate cement clinker described in this example is the same as that in Example 1.

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Abstract

The invention provides sulphoaluminate cement with ardealite as a main raw material and a preparation method of the sulphoaluminate cement, and relates to the technical field of building cement materials. The prepared sulphoaluminate cement with the ardealite as the main raw material is prepared from the following components in parts by weight: 40 to 90 parts of ardealite cement clinker, 10 to 50 parts of dihydrate gypsum and 0 to 40 parts of regulating mineral, wherein the ardealite cement clinker comprises the following main minerals in percentage by weight: 50%-80% of anhydrous calcium sulphoaluminate, 10%-40% of dicalcium silicate, 3%-15% of calcium aluminoferrite, 1%-10% of calcium phosphoaluminate and 1%-10% of calcium fluoroaluminate; the regulating mineral comprises one or two of limestone and lime which are mixed according to any proportion. According to the invention, the ardealite is used for replacing a large amount of natural gypsum, and the preparation requirements of different varieties of sulphoaluminate cement are met by limiting the content of main minerals in the raw materials, doping the gypsum, regulating and controlling the minerals and regulating the proportion and the setting time of hydration products AFt, AFm and AH3, so that the problem of low utilization rate of the ardealite is solved.

Description

technical field [0001] The invention belongs to the technical field of building cement materials, in particular to a sulfoaluminate cement using phosphogypsum as a main raw material and a preparation method thereof. Background technique [0002] Sulfoaluminate cement is a low-carbon, energy-saving green cement, which is significantly lower than Portland cement in terms of firing temperature and carbon dioxide emissions, and has the advantages of low alkalinity, early high strength, micro-expansion, and corrosion resistance. The main mineral components in sulfoaluminate cement are calcium sulfoaluminate, dicalcium silicate, iron phase, gypsum and mineral admixtures. One of the important raw materials in the production process of sulfoaluminate cement is gypsum. During the firing process, gypsum can provide the required Ca and S elements for the sulfoaluminate clinker. [0003] Phosphogypsum is a solid waste produced in the wet phosphoric acid process, and its main component ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32
CPCC04B7/32Y02P40/10
Inventor 常钧王童张平张冰新杨毅
Owner DALIAN UNIV OF TECH
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