Water-quenched slag cement clinker and preparation method thereof

Abstract

The invention provides a water-quenched slag cement clinker and a preparation method thereof, and belongs to the technical field of concrete preparation, the water-quenched slag cement clinker is prepared from the following raw materials by weight: 82-84 parts of limestone; 7.5 to 8.5 parts of sandstone tailing powder; 1.5 to 2.5 parts of water quenching slag; 1.5 to 2.5 parts of coal burning slag; 4.5 to 5.5 parts of aluminum tailing powder; the content of S O2 in the water-quenched slag is 22 to 28 percent, and the content of A < l > 2O3 in the water-quenched slag is 8.5 to 10.5 percent; the content of CaO is 7.5 to 8.5 percent, and the content of R2O is 0.7 to 0.8 percent; and the content of SO3 is 0.25 to 0.35 percent. The prepared water-quenched slag cement clinker can reduce the material cost, and also has the effects of high breaking strength, high compressive strength and stable setting time.

Description

Technical Field

[0001] The invention relates to the technical field of concrete preparation, and in particular to a water-quenched slag cement clinker and a preparation method thereof. Background Art

[0002] Cement clinker is a semi-finished product obtained by mixing limestone, clay and iron raw materials in appropriate proportions, burning them until they are partially or completely melted, and cooling them. In the cement industry, the most commonly used silicate cement clinker has calcium oxide, silicon dioxide and a small amount of aluminum oxide and iron oxide as its main chemical components. The main mineral components are tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. After silicate cement clinker is ground with an appropriate amount of gypsum, it becomes silicate cement.

[0003] Faced with the situation of overcapacity in the national cement industry, in the current highly competitive environment, if enterprises want to achieve long-term stable development and survival, they can only adhere to the right path and innovate to ensure the best product quality, minimize production costs and strive for maximum profits for the enterprise.

[0004] Therefore, it is necessary to develop a cement clinker that meets the demand. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the purpose of the present invention is to provide a water-quenched slag cement clinker, which can reduce material costs and also has the effects of high flexural strength, high compressive strength and stable setting time.

[0006] A water-quenched slag cement clinker is prepared from the following raw material proportions:

[0007]

[0008] The water-quenched slag contains 22-28% SiO2 and 8.5-10.5% Al2O3;

[0009] In a preferred technical solution of the present invention, the CaO content in the water-quenched slag is 7.5-8.5%, and the R2O content is 0.7-0.8%;

[0010] R2O refers to the content of alkaline oxides (Na2O, K2O) in water-quenched slag cement clinker or cement;

[0011] In a preferred technical solution of the present invention, the SO3 in the water-quenched slag is 0.25-0.35%;

[0012] In a preferred technical solution of the present invention, the specific surface area of ​​the water-quenched slag cement clinker is 350-365m 2 / kg, the water-quenched slag cement clinker 0.08mm fineness is 2-2.4%;

[0013] In a preferred technical solution of the present invention, the lime saturation ratio KH in the water-quenched slag cement clinker is 0.88-0.91, the silicon oxygen ratio N is 2.8-2.9, and the aluminum oxygen ratio P is 1.4-1.6;

[0014] In a preferred technical solution of the present invention, f-CaO in the water-quenched slag cement clinker is ≤1%;

[0015] In a preferred technical solution of the present invention, the initial setting time of the water-quenched slag cement clinker is 115-125min;

[0016] In a preferred technical solution of the present invention, the final setting time of the water-quenched slag cement clinker is 175-185 min;

[0017] Another object of the present invention is to provide a method for preparing water-quenched slag cement clinker, comprising the following steps:

[0018] S1. Raw material grinding: According to the raw material ratio of water-quenched slag cement clinker, limestone, sandstone tailings powder, water-quenched slag, coal-fired slag and aluminum tailings powder in the water-quenched slag cement clinker raw materials are added to the raw material roller press for mixing and grinding, and the feed rate is 110-130t / h;

[0019] S2. Clinker calcination: add the ground material into the rotary kiln for calcination, feed rate 80-90t / h, coal powder amount at the kiln head 2.5-3.5t / h, coal powder amount at the kiln tail 5.5-6.5t / h, kiln tail temperature 1000-1100℃, to obtain water-quenched slag cement clinker.

[0020] In a preferred technical solution of the present invention, the coal powder has a fineness of ≤4.0% and a water content of ≤3.0%;

[0021] The beneficial effects of the present invention are:

[0022] The water-quenched slag cement clinker provided by the present invention is mixed by combining specific proportions and has the effects of low cost, high flexural strength, high compressive strength and stable setting time. DETAILED DESCRIPTION

[0023] These examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples without specifying specific conditions are usually carried out according to conventional conditions in the art or according to the conditions recommended by the manufacturer; the raw materials, reagents, etc. used, unless otherwise specified, are all raw materials and reagents that can be obtained from commercial channels such as conventional markets. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention are within the scope of protection claimed by the present invention.

[0024] The raw materials used in the following examples and comparative examples are as follows:

[0025] Raw material roller press: Chengdu Lijun Co., Ltd., model CLF160-80

[0026] Rotary kiln: Chaoyang Heavy Machinery Factory, model Y3250∮3.2×50

[0027] Water quenching slag: Shaanxi Zinc Industry Co., Ltd., Shahezi Village, Shangzhou District

[0028] Nonferrous metal ash: Xianyang Xijian Co., Ltd., Huayin County, Weinan City, Shaanxi Province

[0029] Table 1: The raw materials water-quenched slag and non-ferrous metal ash were tested according to JC T 850-2021 "Chemical Analysis Methods for Ferrous Raw Materials for Cement".

[0030]

[0031] The cement clinkers of Examples 1-5 and Comparative Examples 1-3 were prepared according to the following preparation method:

[0032] S1 raw material grinding: According to the weight ratio of cement clinker raw materials in Table 4 and the comparative example, the raw materials were added to the raw material roller press and mixed and ground, and the feed rate was 110-130t / h;

[0033] S2. Clinker calcination: add the ground material into the rotary kiln for calcination, feed rate 80-90t / h, coal powder amount at the kiln head 2.5-3.5t / h, coal powder amount at the kiln tail 5.5-6.5t / h, kiln tail temperature 1000-1100℃, to obtain water-quenched slag cement clinker.

[0034] in:

[0035] Table 2: Raw material roller press production operating parameters

[0036]

[0037]

[0038] Table 3: Operating parameters for water-quenched slag cement clinker production in rotary kiln

[0039]

[0040] Table 4: Cement clinker proportions by weight of the examples and comparative examples

[0041]

[0042] The water-quenched slag cement clinker obtained in Example 1 and Comparative Example 1 was chemically analyzed according to GB176-2017 and physically tested according to GBT17671-2021 cement mortar strength test method (ISO) and GBT 1346-2011 "cement standard consistency water consumption, setting time, and stability test method":

[0043] Table 5-1: Chemical analysis quality table of water-quenched slag cement clinker of Example 1 and Comparative Example 1

[0044] project nnn SiO2 Al2O3 Fe2O3 CaO MgO SO3 f-CaO R2O Comparative Example 1 0.16 22.74 4.78 3.17 66.34 0.85 0.60 0.62 0.52 Example 1 0.43 22.56 4.82 3.17 66.37 0.97 0.37 0.73 0.48

[0045] Table 5-2: Chemical analysis quality table of water-quenched slag cement clinker of Example 1 and Comparative Example 1

[0046]

[0047] Table 6: Physical inspection quality table of water-quenched slag cement clinker of Example 1 and Comparative Example 1

[0048]

[0049] The specific surface area, 0.08 mm fineness, setting time and flexural and compressive strength of the cement clinker obtained in Examples 1-5 and Comparative Examples 1-3 were physically tested according to GBT17671-2021 "Test Method for Cement Mortar Strength (ISO)", GBT 1346-2011 "Test Method for Water Consumption, Setting Time and Stability of Cement Standard Consistency", GBT8074-2008 "Method for Determination of Specific Surface Area of ​​Cement - Blaine Method", and GBT1345-2005 "Test Method for Cement Fineness - Sieve Analysis Method".

[0050] Table 7: Test results of Examples 1-5 and Comparative Examples 1-3

[0051]

[0052]

[0053] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to those of ordinary skill in the art. The choice of terms used in this article is intended to best explain the principles of the embodiments, practical applications or improvements to the technology in the market, or to enable other ordinary technicians in the technical field to understand the embodiments disclosed herein.

Claims

1. A water-quenched slag cement clinker, characterized in that: Prepared by the following raw material ratio: The water-quenched slag contains 22-28% SiO2 and 8.5-10.5% Al2O3.

2. The water-quenched slag cement clinker according to claim 1, characterized in that: The water-quenched slag contains 7.5-8.5% CaO and 0.7-0.8% R2O.

3. The water-quenched slag cement clinker according to claim 1, characterized in that: The SO3 content in the water-quenched slag is 0.25-0.35%.

4. The water-quenched slag cement clinker according to claim 1, characterized in that: The specific surface area of ​​the water-quenched slag cement clinker is 350-365m 2 / kg, the water-quenched slag cement clinker 0.08mm fineness is 2-2.4%.

5. The water-quenched slag cement clinker according to claim 1, characterized in that: The lime saturation ratio KH in the water-quenched slag cement clinker is 0.88-0.91, the silicon oxygen ratio N is 2.8-2.9, and the aluminum oxygen ratio P is 1.4-1.

6.

6. A method for preparing water-quenched slag cement clinker according to any one of claims 1 to 5, characterized in that The following steps are involved: S1. Raw material grinding: According to the raw material ratio of water-quenched slag cement clinker, limestone, sandstone tailings powder, water-quenched slag, coal-fired slag and aluminum tailings powder in the water-quenched slag cement clinker raw materials are added to the raw material roller press for mixing and grinding, and the feed rate is 110-130t / h; S2. Clinker calcination: add the ground material into the rotary kiln for calcination, feed rate 80-90t / h, coal powder amount at the kiln head 2.5-3.5t / h, coal powder amount at the kiln tail 5.5-6.5t / h, kiln tail temperature 1000-1100℃, to obtain water-quenched slag cement clinker.

7. The method for preparing water-quenched slag cement clinker according to claim 6, characterized in that: The coal powder has a fineness of ≤4.0% and a moisture content of ≤3.0%.

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