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Method for calcining Belite sulphoaluminate cement clinker by using phosphogypsum and cement clinker

A technology of special sulfur aluminate and cement clinker, which is applied in the field of cement and can solve problems such as geological disasters, collapse of phosphogypsum slag field, landslides and debris flows

Active Publication Date: 2018-11-27
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resource utilization of phosphogypsum is mainly to produce gypsum cementitious materials and as a retarder for ordinary Portland cement, but the harmful impurities such as phosphorus and fluorine contained in phosphogypsum have a certain adverse effect on the application performance, so the utilization rate of phosphogypsum Less than 10%, a large amount of storage of phosphogypsum not only occupies a large amount of land, but also poses certain safety hazards. Long-term rainwater leaching may lead to the collapse of the phosphogypsum slag yard, and landslides and mud-rock flows will occur in severe cases, resulting in man-made geological disasters

Method used

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  • Method for calcining Belite sulphoaluminate cement clinker by using phosphogypsum and cement clinker
  • Method for calcining Belite sulphoaluminate cement clinker by using phosphogypsum and cement clinker
  • Method for calcining Belite sulphoaluminate cement clinker by using phosphogypsum and cement clinker

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Place the three raw materials in a drying oven at 100°C and dry them in percentage by weight: phosphogypsum 76.5%, electrolytic aluminum ash 13.3%, and fly ash 10.2%. Weigh 3000g of the mixture and mix it evenly. In the test ball mill, the sieve residue of the 80μm square hole sieve is 8-12%. Add the raw meal powder to 1% tap water, stir evenly and put it into a round grinding tool with an inner diameter of 8 cm and a depth of 2 cm, press it into a cake with a small press, and dry the cake in an oven at 100°C. Take 8 cakes each time, put them into a test electric furnace that is preheated to 1000°C for preheating and desulfurization for 160 minutes, then continue to increase the temperature of the test electric furnace to a temperature of 1350°C, and calcine for 60 minutes until the clinker is mineralized Completely formed. The calcined clinker is blown and cooled to room temperature by a fan.

[0041] After the cooled clinker is crushed, it is ground to a specific surfa...

Embodiment 2

[0048] Place the three raw materials in a drying oven at 100°C and dry them in percentage by weight: phosphogypsum 79.6%, electrolytic aluminum ash 10.1%, and fly ash 10.3%. Weigh 3000g of the mixture and mix it evenly. In the test ball mill, the sieve residue of the 80μm square hole sieve is 8-10%. Add 1% tap water to the raw meal powder, stir evenly and put it into a round grinding tool with an inner diameter of 8cm and a depth of 2cm. Use a small press to form a cake, and place the cake in an oven at 100°C. . Take 8 cakes each time, put them into a test electric furnace that is preheated to 1100°C for preheating and desulfurization for 180 minutes, then continue to increase the temperature of the test electric furnace to a temperature of 1320°C, and calcine for 80 minutes until clinker minerals Completely formed. The calcined clinker is blown and cooled to room temperature by a fan.

[0049] After the cooled clinker is crushed, it is ground to a specific surface area of ​​4...

Embodiment 3

[0056] Place the three raw materials in a drying box at 100°C and dry them in percentage by weight: phosphogypsum 75.1%, electrolytic aluminum ash 10.0%, and fly ash 14.9%. Weigh 3000g of the mixture and mix it evenly. In the test ball mill, the sieve residue of the 80μm square hole sieve is 8-10%. Add 1% tap water to the raw meal powder, stir evenly and put it into a round grinding tool with an inner diameter of 8cm and a depth of 2cm. Use a small press to form a cake, and place the cake in an oven at 100°C. . Take 8 cakes each time and put them into a test electric furnace that is preheated to 1000°C for preheating and desulfurization for 160 minutes, then continue to increase the temperature of the test electric furnace to a temperature of 1350°C and calcine for 70 minutes until the clinker is mineralized Completely formed. The calcined clinker is blown and cooled to room temperature by a fan.

[0057] After the cooled clinker is crushed, it is ground to a specific surface ...

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Abstract

The invention discloses a method for calcining Belite sulphoaluminate cement clinker by using phosphogypsum and the cement clinker, and belongs to the field of cement. The method for calcining the Belite sulphoaluminate cement clinker by using phosphogypsum comprises the following steps of 1, weighing, by mass, 75-80% phosphogypsum, 10-15% of aluminum raw materials and 10-15% of siliceous raw materials, and conducting mixing and grinding to obtain a cement raw material; 2, preheating the cement raw material at 1,000-1,100 DEG C, conducting desulfurization for 160-180 minutes, and calcining thecement raw material at 1,320-1,350 DEG C for 60-80 minutes until the clinker mineral is completely formed. The method for calcining the Belite sulphoaluminate cement clinker by using phosphogypsum and the cement clinker have the advantages that the original calcium raw material is not used in the accessory material, and phosphogypsum is utilized to the maximum degree.

Description

Technical field [0001] The invention belongs to the field of cement, and particularly relates to a method for calcining belite sulfoaluminate cement clinker with phosphogypsum and cement clinker. Background technique [0002] High Belite sulphoaluminate cement clinker is a new type of cement clinker with low carbon emission and low energy consumption. Compared with ordinary Portland cement clinker, high belite sulfoaluminate cement clinker can save energy consumption and reduce carbon dioxide emissions by more than 20%, respectively, and can exceed ordinary Portland cement clinker in performance to achieve special The technical level of sulphoaluminate cement clinker. High Belite sulphoaluminate cement can not only replace ordinary Portland cement in ordinary concrete structural engineering, but also replace special sulphoaluminate cement, and be used in some high value-added special projects, special mortars and mortars. In concrete products, it produces high economic value. ...

Claims

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Application Information

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IPC IPC(8): C04B7/345C04B7/32C04B7/36
CPCC04B7/323C04B7/3453C04B7/36Y02P40/10
Inventor 姚丕强韩辉
Owner TIANJIN CEMENT IND DESIGN & RES INST
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