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Calcium sulphoaluminate modified Portland cement preparation method

A technology of Portland cement and calcium sulfoaluminate, which is applied in the field of cement, can solve problems such as polluting the environment, affecting kiln operation and stable operation, and low 3d/28d strength increase rate, and achieves increased mixing amount, initial setting and The effect of prolonging the final setting time and improving the strength increase rate

Active Publication Date: 2021-05-28
ZHENGZHOU JIANWEN SPECIAL MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production process of the new dry process kiln, mineralizers such as fluorite as raw materials will seriously pollute the environment. In addition, mineralizers will affect the operation and stable operation of the kiln. In addition, there are also disadvantages of low 3d / 28d strength increase rate, which is urgently needed solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of calcium sulfoaluminate modified Portland cement, comprising the steps of:

[0025] S1. Mix 40kg of limestone, 15kg of sandstone, 4kg of calcium carbide slag, and 5kg of shale evenly, add them to the raw meal mill, grind them, add them to the rotary kiln for drying, and then fire them. The firing temperature is 1350°C and the firing time is 40 minutes. , cooled to below 100°C, and processed by rolling, breaking up and cement milling successively to obtain Portland cement raw meal;

[0026] S2. Add 4 kg of calcium sulfoaluminate and 40 kg of absolute ethanol to a high-speed mixer, and stir for 10 minutes at a speed of 10000 r / min to obtain pretreated calcium sulfoaluminate;

[0027] Add 1 kg of nano wollastonite with a particle size of 1-100 nm and 1 kg of isopropyl tris(dioctyl pyrophosphoryl) titanate into 2 kg of absolute ethanol, stir at a speed of 400 r / min for 20 min, and add to high pressure In the kettle, feed carbon dioxide to a pressure ...

Embodiment 2

[0032] A preparation method of calcium sulfoaluminate modified Portland cement, comprising the steps of:

[0033] S1. Mix 80kg of limestone, 5kg of sandstone, 10kg of calcium carbide slag, and 1kg of shale evenly, add them to the raw meal mill, grind them, add them to the rotary kiln for drying, and then fire them. The firing temperature is 1420°C and the firing time is 20 minutes. , cooled to below 100°C, and processed by rolling, breaking up and cement milling successively to obtain Portland cement raw meal;

[0034] S2. Add 10 kg of calcium sulfoaluminate and 20 kg of absolute ethanol to a high-speed mixer, and stir for 5 minutes at a speed of 20,000 r / min to obtain pretreated calcium sulfoaluminate;

[0035] Add 3 kg of nano wollastonite with a particle size of 1-100 nm and 0.1 kg of isopropyl tris(dioctyl pyrophosphoryl) titanate into 6 kg of absolute ethanol, stir for 40 min at a speed of 200 r / min, and add to In the autoclave, feed carbon dioxide to a pressure of 25MPa...

Embodiment 3

[0040] A preparation method of calcium sulfoaluminate modified Portland cement, comprising the steps of:

[0041] S1. Mix 50kg of limestone, 14kg of sandstone, 5kg of calcium carbide slag, and 2kg of shale evenly, add them to the raw meal mill, grind them, add them to the rotary kiln for drying, and then fire them. The firing temperature is 1400°C and the firing time is 25 minutes. , cooled to below 100°C, and processed by rolling, breaking up and cement milling successively to obtain Portland cement raw meal;

[0042] S2. Add 8 kg of calcium sulfoaluminate and 25 kg of absolute ethanol to a high-speed mixer, and stir for 6 minutes at a speed of 18000 r / min to obtain pretreated calcium sulfoaluminate;

[0043]Add 2.5kg of nano wollastonite with a particle size of 1-100nm and 0.2kg of isopropyltris(dioctylpyrophosphoryl) titanate into 5kg of absolute ethanol, stir at a speed of 240r / min for 35min, add Into the autoclave, feed carbon dioxide to a pressure of 26MPa, heat the sys...

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Abstract

The invention discloses a calcium sulphoaluminate modified Portland cement preparation method, which comprises the following steps of uniformly mixing limestone, sandstone, carbide slag and shale, grinding, firing for 20-40 min at a temperature of 1350-1420 DEG C, cooling to a temperature of less than 100 DEG C, and sequentially carrying out rolling, scattering and cement grinding treatment to obtain a Portland cement raw material, stirring calcium sulphoaluminate and absolute ethyl alcohol to obtain pretreated calcium sulphoaluminate, adding nano wollastonite and a titanate coupling agent into absolute ethyl alcohol, stirring, adding into a high-pressure kettle, introducing carbon dioxide, heating the system in a stirring state, spraying the pretreated calcium sulphoaluminate, fully mixing, and drying to obtain coated calcium sulphoaluminate, uniformly mixing Portland cement clinker, coated calcium sulphoaluminate, coal gangue and desulfurized gypsum, and grinding to obtain a mixture, and calcining the mixture at 1300-1400 DEG C for 40-60 minutes, naturally cooling to room temperature, and grinding to obtain the calcium sulphoaluminate modified Portland cement.

Description

technical field [0001] The invention relates to the technical field of cement, in particular to a preparation method of calcium sulfoaluminate modified Portland cement. Background technique [0002] At present, general-purpose cement is Portland cement series, which is processed by the process of "two grinding and one burning" with appropriate raw materials, designed appropriate ratio and composition, and is the most widely produced and used hydraulic cementitious material. The calcium sulfoaluminate modified Portland cement is made of Portland cement clinker containing a small amount of anhydrous calcium sulfoaluminate, mixed with the specified mixed materials and an appropriate amount of gypsum, and has early strength and micro-expansion properties. The hydraulic cementitious material is called calcium sulfoaluminate modified Portland cement, and the implementation standard is "JC / T1099-2009 Calcium sulfoaluminate modified Portland cement". [0003] Calcium sulfoaluminate...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/24
CPCC04B7/323C04B7/24Y02P40/10
Inventor 李豪张世杰张学文刘小芬张进卫
Owner ZHENGZHOU JIANWEN SPECIAL MATERIAL TECH