A method for calcining belite sulphoaluminate cement clinker with phosphogypsum and cement clinker

A special sulfoaluminate, cement clinker technology, applied in the field of cement, can solve problems such as less than 10%, hidden safety hazards, geological disasters, etc.

Active Publication Date: 2020-12-01
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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  • A method for calcining belite sulphoaluminate cement clinker with phosphogypsum and cement clinker
  • A method for calcining belite sulphoaluminate cement clinker with phosphogypsum and cement clinker
  • A method for calcining belite sulphoaluminate cement clinker with phosphogypsum and cement clinker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Put the three kinds of raw materials in a drying box and dry them at 100°C. They are composed by weight percentage: 76.5% of phosphogypsum, 13.3% of electrolytic aluminum ash, and 10.2% of fly ash. Weigh 3000g of the mixed material and mix it evenly. In the test ball mill, it is ground to 80 μm square hole sieve and the sieve residue is 8-12%. Add raw meal powder to 1% tap water, stir evenly, put it into a round abrasive mold with an inner diameter of 8cm and a depth of 2cm, press it into a cake with a small press, and dry the cake in an oven at 100°C. Take 8 cakes at a time, put them into a test electric furnace heated to 1000°C for preheating and desulfurization for 160 minutes, then continue to raise the temperature of the test electric furnace to 1350°C, and calcinate for 60 minutes until the clinker minerals fully formed. The calcined clinker is cooled to room temperature by fan blowing.

[0041] After crushing the cooled clinker, use a ball mill to grind to a fi...

Embodiment 2

[0048] Put the three kinds of raw materials in a drying box and dry them at 100°C, and they are composed by weight percentage: 79.6% of phosphogypsum, 10.1% of electrolytic aluminum ash, and 10.3% of fly ash. Weigh 3000g of the mixed material and mix it evenly. In the test ball mill, it is ground to 80 μm square hole sieve and the sieve residue is 8-10%. Add 1% tap water to the raw meal powder, stir evenly, put it into a circular abrasive with an inner diameter of 8cm and a depth of 2cm, 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 the test electric furnace heated to 1100°C for preheating and desulfurization for 180 minutes, then continue to raise the temperature of the test electric furnace to 1320°C, and calcinate for 80 minutes until the clinker minerals fully formed. The calcined clinker is cooled to room temperature by fan blowing.

[0049] After crushing the cooled clinker, use a ball mill to gri...

Embodiment 3

[0056] Put the three kinds of raw materials in a drying box and dry them at 100°C, and they are composed by weight percentage: 75.1% of phosphogypsum, 10.0% of electrolytic aluminum ash, and 14.9% of fly ash. Weigh 3000g of the mixed material and mix it evenly. In the test ball mill, it is ground to 80 μm square hole sieve and the sieve residue is 8-10%. Add 1% tap water to the raw meal powder, stir evenly, put it into a circular abrasive with an inner diameter of 8cm and a depth of 2cm, 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 the test electric furnace heated to 1000°C for preheating and desulfurization for 160 minutes, then continue to raise the temperature of the test electric furnace to 1350°C, and calcinate for 70 minutes until the clinker minerals fully formed. The calcined clinker is cooled to room temperature by fan blowing.

[0057] After crushing the cooled clinker, use a ball mill to gri...

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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 in particular relates to a method for calcining belite sulphoaluminate cement clinker with phosphogypsum and the cement clinker. Background technique [0002] High Belite sulfoaluminate 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 sulphoaluminate cement clinker can save energy consumption and reduce carbon dioxide emissions by more than 20%, and its performance can exceed ordinary portland cement clinker, reaching special The technical level of sulphoaluminate cement clinker. High Belite sulphoaluminate cement can not only replace ordinary Portland cement in ordinary concrete structure projects, but also can replace special sulphoaluminate cement in some high value-added special projects, special mortars and In concrete products, it produces high economic value in use. Therefore, high be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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