Process for fast baking early strength silicate cement clinker

A Portland cement and clinker technology, which is applied in the field of cement production, can solve the problems of small increase in cement strength, abnormal cement setting time, limited reduction of clinker heat consumption, etc., and achieves good sulfate corrosion resistance. , The effect of easy process and stable increase in strength

Inactive Publication Date: 2005-11-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The use of mineralizer technology in shaft kiln cement plants has played a positive role in improving the quality of shaft kiln cement clinker, but the increase in cement strength is not large, and the reduction in clinker heat consumption is limited, and a considerable number of shaft kiln cement plants use ore After adding the chemical agent, the cement has problems such as abnormal setting time and early strength decline.
For ordinary Portland cement produced by adding cement clinker (seed crystal), the strength improvement is not obvious, or even no improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Chemical analysis of raw materials and fuel materials are shown in Table 1

[0032] name

[0033]

[0034] BaSO in barite 4 =92.50%, CaF in fluorite 2 =72.62%.

[0035] W f

[0036] Ingredients scheme without compound additives:

[0037] The mass percentages are: limestone 76.0%, clay 9.3%, iron ore 2.7%, coal ash 12.0%;

[0038] Value rate: KH=0.94, n=1.83, p=1.2.

[0039] Firing temperature is 1350℃~1450℃

[0040] The ingredient scheme of adding compound additives:

[0041] The mass percentage is: limestone 71.0%, clay 9.5%, coal ash 10.5%, steel slag 6.0%, barite 2.0%, fluorite 1.0%;

[0042] Value rate: KH=0.99, n=1.78, p=1.18.

[0043] Firing temperature is 1250℃~1320℃

[0044] See Table 3 for the effect comparison between adding additives 6.0% steel slag + 2.0% barite + 1.0% fluorite and before adding composite additives.

[0045]

[0046] Note: The fineness shall be inspected according to GB1345, the consistency...

Embodiment 2

[0048] The chemical analysis of the raw materials is shown in Table 4

[0049] name

[0050] dolomite

[0051] W f

[0052] Ingredients scheme without compound additives:

[0053] The mass percentages are: limestone 73.0%, clay 15.0%, coal ash 12.0%;

[0054] Value rate: KH=0.95, n=2.10, p=1.08.

[0055] Firing temperature is 1350℃~1450℃

[0056] The ingredient scheme of adding compound additives:

[0057] The mass percentages are: limestone 71.4%, clay 14.8%, coal ash 10.0%, dolomite 0.8%, fluorite 1.5%, phosphogypsum powder 1.5%;

[0058] Value rate: KH=0.96, n=2.24, p=1.07.

[0059] Firing temperature is 1250℃~1320℃

[0060] See Table 6 for the effect comparison between adding additive 0.8% dolomite + 1.5% fluorite + 1.5% phosphogypsum powder and before adding compound additive.

[0061]

[0062] In addition, the output of the shaft kiln is increased by 23.7%, the heat consumption of the clinker is reduced by 17.2%, and the f-C...

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Abstract

An early-strengthening silicate cement clinker contains 3CaO.SiO2, 4CaO.Al2O3.Fe2O3, 3(CaO.Al2O3).CaSO4 and 11CaO.7Al2O3.CaF2, and is prepared by high-speed calcining method using vertical kiln. Its advantages are high productivity, early strengthening, stable latter strength, and excellent performance.

Description

technical field [0001] The invention belongs to the field of cement production, and in particular relates to a rapid firing method for high-grade early-strength Portland cement clinker Background technique [0002] The use of mineralizer technology in shaft kiln cement plants has played a positive role in improving the quality of shaft kiln cement clinker, but the increase in cement strength is not large, and the reduction in clinker heat consumption is limited, and a considerable number of shaft kiln cement plants use ore After adding the chemical agent, the cement has problems such as abnormal setting time and early strength decline. For ordinary Portland cement produced by adding cement clinker (seed crystal), the strength is not significantly improved, or even no improvement. Contents of the invention [0003] The present invention aims at the above main defects of the cement produced by using mineralizers or crystal seeds, and provides a method for rapid sintering of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/43
Inventor 黄从运张明飞张美香柯劲松
Owner WUHAN UNIV OF TECH
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