Cement clinker preparation method using converter steel slag to correct iron quality

A converter steel slag and cement clinker technology, which is applied in clinker production, cement production, etc., can solve the problems of insufficient steel slag seed crystal effect, insufficient grinding fineness, and reduced grinding efficiency, etc., to improve flammability , Improve efficiency and reduce heat consumption

Active Publication Date: 2014-08-20
宝武环科武汉金属资源有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in some cement production, steel slag tailings are used as raw materials for iron correction raw materials to burn cement clinker. However, because steel slag contains some refractory phases, these refractory phases are mainly divalent metal oxides, such as: Infinite solid solution formed by MgO, FeO, MnO, etc., namely: RO phase, and magnetic ferrite mineral Ca 2 (Al,Fe) 2 o 5 , that is: iron particles, which makes steel slag less grindable, so that the existing cement production process using steel slag as iron correction raw material has the following disadvantages: 1) The grinding efficiency of cement raw meal is affected by steel slag; 2) powder The grinding fineness is not enough, the role of steel slag seed crystals is not fully exerted, and the stability is poor

Method used

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  • Cement clinker preparation method using converter steel slag to correct iron quality
  • Cement clinker preparation method using converter steel slag to correct iron quality
  • Cement clinker preparation method using converter steel slag to correct iron quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 1.9wt% of the converter steel slag after the two-stage step grinding, 80wt% of limestone, 15.2wt% of shale, and 2.9wt% of sandstone to the raw mill and mix evenly, and grind to conventional raw meal powder. The fineness of the milled converter steel slag and cement raw meal mixture is put into the kiln for calcination at a temperature of 1400°C to obtain the corresponding cement clinker.

[0032] After testing, the f-CaO of cement clinker is 0.52%; desulfurized gypsum is added based on 2.5% sulfur trioxide by weight. The net cement clinker strength test results are as follows: 3d strength is 62.9MPa, 28d The strength is 74.7MPa; the quality of cement clinker is uniform, there is no local steel slag enrichment phenomenon, and its microstructure is shown figure 1 .

Embodiment 2

[0034] Add 3wt% of the converter steel slag after the second step grinding, 79wt% of limestone, 15wt% of shale, and 3wt% of sandstone to the raw mill to mix evenly, and grind to the fineness of conventional raw meal. ; The mixed milled converter steel slag and cement raw meal mixture is put into the kiln for calcination at a temperature of 1400 ℃ to obtain the corresponding cement clinker.

[0035] After testing, the f-CaO of cement clinker is 0.41%; desulfurization gypsum is added based on 2.5% sulfur trioxide by weight. The net cement clinker strength test results are as follows: 3d strength is 63.8MPa, 28d The strength is 77.3MPa; the quality of cement clinker is uniform, there is no local steel slag enrichment phenomenon, and its microstructure can be seen figure 2 .

Embodiment 3

[0037] Add 3.5wt% of the converter steel slag after the two-stage step grinding, 77.8wt% of limestone, 17.1wt% of shale, and 1.6wt% of sandstone into the raw mill to mix evenly, and grind to conventional raw meal. The fineness of the powder; the mixed milled converter steel slag and cement raw meal mixture is put into the kiln for calcination at a temperature of 1400°C to obtain the corresponding cement clinker.

[0038] After testing, the f-CaO of cement clinker is 0.39%; desulfurized gypsum is added based on 2.5% sulfur trioxide by weight. The net cement clinker strength test results are as follows: 3d strength is 62.7MPa, 28d The strength is 77.4MPa; the quality of cement clinker is uniform, there is no local steel slag enrichment phenomenon, and its microstructure is visible image 3 .

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Abstract

The invention discloses a cement clinker preparation method using converter steel slag to correct iron quality. The preparation method comprises the following steps: 1) gradient grinding and magnetic separation; 2) mixing and grinding: a step of fully and uniformly mixing and grinding more than 0 wt% but no more than 5.4 wt% of converter steel slag with a cement raw material; and 3) calcining at a temperature of 1380 to 1400 DEG C so as to prepare the cement clinker. Directed at the characteristic that iron particles and difficult-to-grind phases like an RO phase in the converter steel slag are in the state of enrichment, the method provided by the invention carries out two-stage gradient grinding and sorts out iron particles and difficult-to-grind phases like the RO phase enriched in the converter steel slag by using a strong magnetic field, then the converter steel slag and the cement raw material are mixed, ground and calcined so as to prepare the cement clinker, so grinding efficiency of the cement raw material is improved, the service life of grinding equipment is prolonged, the converter steel slag is finer, the effect of seed induction of the converter steel slag is given to full play in the process of calcining of the cement clinker, the calcining temperature of cement is decreased by more than 50 DEG C, and the refined converter steel slag can adjust the aluminum rate (IM) in the cement raw material and functions as a mineralizer and a promoter.

Description

Technical field [0001] The invention relates to cement production technology, in particular to a method for preparing cement clinker that uses converter steel slag to correct iron. Background technique [0002] Cement has become a basic building material for infrastructure construction worldwide due to its large output, wide use, and uniqueness that is difficult to replace. At present, the total output of cement in my country exceeds 2 billion tons, and the demand for raw materials for cement production is very large. [0003] Incorporating steel slag into cement raw material can not only reduce the silica oxygen rate, significantly reduce the content of f-CaO and improve the quality of clinker, but also reduce the environmental load. Therefore, the use of steel slag in cement production can not only improve cement performance, but also steel slag. Provides an efficient resource utilization approach. At present, in some cement production, steel slag tailings are used as raw materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/147C04B7/36
CPCY02P40/10Y02P40/121
Inventor 甘万贵唐岚华洲连李亚光董文楷余海李昌彬
Owner 宝武环科武汉金属资源有限责任公司
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