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Cement clinker and preparation method thereof

A technology for cement clinker and mixture, which is applied in cement production and other directions, can solve the problems of high alumina dissolution rate and difficulty in obtaining

Active Publication Date: 2015-04-08
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when the alumina in the self-powdering reduction slag of the prior art is dissolved by a wet method, it is difficult to obtain a higher alumina dissolution rate because the MgO content of the self-powdering reduction slag is very strict.

Method used

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  • Cement clinker and preparation method thereof
  • Cement clinker and preparation method thereof
  • Cement clinker and preparation method thereof

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preparation example Construction

[0020] figure 1 is a process flow diagram showing the method for preparing cement clinker according to the present invention. refer to figure 1 , the method for preparing cement clinker according to the present invention comprises: mixing high-iron bauxite ore powder, carbonaceous reducing agent, slaked lime, organic binder and water to obtain a mixture; making the mixture into pellets; drying the pellets; performing direct reduction melting on the dried pellets; cooling the pellets so that the pellets are self-pulverized to obtain a powder; sieving the powder to obtain granular iron and the first self-pulverized reduced slag and performing magnetic separation on the first self-pulverizing reduced slag to obtain granular iron and the second self-pulverizing reduced slag as cement clinker.

[0021] The high-iron type bauxite ore powder used in the method for preparing cement clinker according to the present invention may have an Al content of not less than 20% (for example, 2...

Embodiment 1

[0055]The high-iron type bauxite and anthracite with an iron grade of 30.03%, an alumina grade of 25.84%, and an A / S of 2.38 were ground to a particle size of 60-120 mesh. Based on 100% of the total weight of high-iron bauxite ore powder, anthracite and slaked lime, 56.93% of high-iron-type bauxite ore powder, 11.28% of anthracite coal powder, and 31.79% of slaked lime are uniformly mixed. Based on the total weight of high-iron bauxite ore, anthracite and slaked lime, add 7% of water and 4% of industrial syrup to the mixture of high-iron bauxite ore, anthracite and slaked lime, and mix well to obtain a mixture . The mixed material is fed into the roller briquetting machine with a belt to briquette to obtain ellipsoidal pellets with a size of φ40mm (long diameter)×30mm (short diameter). The pellets are sent to a mesh belt type continuous drying box with a belt for drying, the drying temperature is 240°C, and the drying time is 2 hours. After drying, the pellets are sent to a ...

Embodiment 2

[0058] The high-iron type bauxite and anthracite with an iron grade of 30.82%, an alumina grade of 24.32%, and an A / S of 1.98 were ground to a particle size of 60-120 mesh. Based on 100% of the total weight of high-iron bauxite powder, anthracite and slaked lime, 55.71% of high-iron bauxite powder, 11.04% of anthracite powder, and 33.25% of slaked lime are evenly mixed. Based on the total weight of high-iron bauxite ore, anthracite and slaked lime, add 8% water and 3% industrial syrup to the mixture of high-iron bauxite ore, anthracite and slaked lime, and mix well to obtain a mixture . The mixed material is fed into the roller briquetting machine with a belt to briquette to obtain ellipsoidal pellets with a size of φ40mm (long diameter)×30mm (short diameter). The pellets are sent into a mesh belt type continuous drying box with a belt for drying, the drying temperature is 250°C, and the drying time is 2.5 hours. After drying, the pellets are sent to a multi-channel high-tem...

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Abstract

The invention provides a cement clinker and a preparation method thereof. The preparation method comprises the following steps: mixing high-iron bauxite powder, a carbon reductant, hydrated limes, an organic binder and water to obtain a mixture; preparing the mixture into a pellet; drying the pellet; directly carrying out reduction and melting separation on the dried pellet; cooling the pellet, and carrying out self-pulverization on the pellet to obtain powder; sieving the powder to obtain grained irons and first self-pulverized reducing slag; and carrying out magnetic separation on the first self-pulverized reducing slag to obtain grained irons and second self-pulverized reducing slag which serves as the cement clinker, wherein based on the total weight of bauxite powder, the carbon reductant and the hydrated limes, the weight percentage of the bauxite powder is 54.55-56.93 percent, the weight percentage of the carbon reductant is 10.81-11.28 percent, the weight percentage of the hydrated lime is 31.79-34.64 percent, the weight of the organic binder accounts for 2-4 percent of the total weight of the bauxite powder, the carbon reductant and the hydrated lime, and the weight of the water accounts for 7-9 percent of the total weight of the bauxite powder, the carbon reductant and the hydrated lime.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a cement clinker and a preparation method thereof. Background technique [0002] High-iron bauxite usually contains a higher content of iron oxides. In the prior art, coal-based direct reduction and melting of high-iron bauxite can obtain granular iron and extremely fine self-powdering reduction slag with a very high yield. High-quality granulated iron can be directly used as a steelmaking coolant for converters or electric furnaces, while self-pulverizing reduced slag has not been effectively comprehensively utilized. For example, when the alumina in the self-powdering reduction slag of the prior art is dissolved by a wet method, it is difficult to obtain a higher alumina dissolution rate because the MgO content of the self-powdering reduction slag is very strict. Contents of the invention [0003] An object of the present invention is to provide a cement clinker ...

Claims

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Application Information

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IPC IPC(8): C04B7/32
CPCY02P40/10
Inventor 张颖异高建军齐渊洪师学峰程项利
Owner CENT IRON & STEEL RES INST