阅读说明：本技术 一种使用高铁质含量原料生产机场水泥的制备方法 (Preparation method for producing airport cement by using high-iron-content raw materials ) 是由 常文涛 崔军 宁宝庆 吕寿江 于 2020-12-28 设计创作，主要内容包括：本发明公开了一种使用高铁质含量原料生产机场水泥的制备方法,包括生料配料、生料粉磨、熟料烧成、水泥配料、水泥磨粉和水泥成品,其中生料配料原料包括石灰石、煤矸石、废硅石粉末、废铁石粉末,水泥配料原料包括水泥生料和煤灰,采用该使用高铁质含量原料生产机场水泥的制备方法得到的水泥,不仅各项性能满足机场使用标准,同时各项指标性能还明显优于现用的机场水泥。通过使用高含量铁质原料生产出符合机场水泥标准的专用熟料后磨制机场水泥,有效的保证水泥抗折强度、耐磨性等主要质量指标达到标准要求,有利于在机场水泥加工行业进行普及和推广。(The invention discloses a method for preparing airport cement by using high iron content raw materials, which comprises raw material blending, raw material grinding, clinker firing, cement blending, cement grinding powder and cement finished products, wherein the raw material blending comprises limestone, coal gangue, waste silica powder and waste iron stone powder, the raw material blending comprises cement raw material and coal ash, and the cement prepared by using the method for preparing airport cement by using high iron content raw materials not only meets airport use standards, but also has various index performances obviously superior to the airport cement currently used. The airport cement is ground after the special clinker meeting the airport cement standard is produced by using the high-content iron raw material, so that the main quality indexes of the cement, such as breaking strength, wear resistance and the like, can effectively meet the standard requirements, and the popularization and the promotion in the airport cement processing industry are facilitated.)

1. A preparation method for producing airport cement by using a raw material with high iron content is characterized by comprising the following steps:

1) raw material proportioning: in a batching station of a raw material mill system, various raw materials are proportioned according to a production scheme, and are accurately batched by using a scale;

2) and raw material grinding: grinding the materials into fine powder by using a raw material grinding machine, and conveying the fine powder to a raw material storage tank for storage;

3) and sintering clinker: conveying the raw material fine powder to a preheater and a rotary kiln for calcination by using a conveying device to form clinker taking calcium silicate as a main component, and conveying the clinker to a clinker tank for storage;

4) and cement batching: in a batching station of a cement mill system, the prepared raw materials and auxiliary raw materials are accurately batched by using a scale according to the proportion specified by a production scheme;

5) milling cement: grinding the materials into cement fine powder finished products by using a cement grinding machine, and conveying the cement fine powder finished products to a cement storage tank for storage;

6) and cement finished products: discharging materials under the cement tank, and ensuring the homogenization of cement through the matching of a plurality of tanks to obtain finished cement for airports, which can be used on the market and has uniform and stable quality;

wherein, the raw material ingredients in step 1 comprise limestone, coal gangue, waste silica powder and waste iron stone powder, and the weight parts of the raw material ingredients are as follows: 78-89 parts of limestone, 1.6-4.8 parts of coal gangue, 5.2-7.8 parts of waste silica powder and 4.2-6.5 parts of waste iron stone powder.

2. The method for preparing airport cement using high iron content raw material as claimed in claim 1, wherein the raw material of the step 1 comprises limestone, coal gangue, waste silica powder and waste iron stone powder in the following weight portions: 80-87 parts of limestone, 2.5-3.8 parts of coal gangue, 5.6-6.8 parts of waste silica powder and 4.8-5.6 parts of waste iron stone powder.

3. The method for preparing airport cement using high iron content raw material as claimed in claim 1, wherein the raw material of the step 1 comprises limestone, coal gangue, waste silica powder and waste iron stone powder in the following weight portions: 85.6 parts of limestone, 3 parts of coal gangue, 6.4 parts of waste silica powder and 5 parts of waste iron stone powder.

4. The method for preparing airport cement by using high iron content raw materials as claimed in claim 1, wherein the cement ingredient raw materials in step 4 comprise cement raw materials and coal ash, and the weight parts of each ingredient raw material are as follows: 88-99 parts of cement raw material and 2.8-4.2 parts of coal ash.

5. The method for preparing airport cement by using high iron content raw materials as claimed in claim 4, wherein the cement ingredient raw materials in step 4 comprise cement raw materials and coal ash, and the weight parts of each ingredient raw material are as follows: 96.58 parts of cement raw materials and 3.42 parts of coal ash.

6. The method of claim 1, wherein the conveying means in step 2 comprises a lifter, an air chute.

Technical Field

The invention relates to the field of cement preparation, in particular to a preparation method for producing airport cement by using a high-iron-content raw material.

Background

Cement is a powdered hydraulic inorganic cementing material. The cement is added with water and stirred to form slurry which can be hardened in the air or in water and can firmly bond materials such as sand, stone and the like together, and the cement is taken as an important cementing material for a long time and widely applied to engineering such as civil construction, water conservancy, national defense and the like,

with the progress of scientific technology and the strict use requirements of various subdivided environments, the traditional cement formula and the preparation method have the classification of multiple purposes and multiple properties, and in recent years, the cement for airport construction is also increasingly mentioned. Under the use environment of an airport, the conventional cement has the condition that main quality indexes such as flexural strength, wear resistance and the like cannot meet the use requirement of the airport, the airport cement requires that the content of tetracalcium aluminoferrite reaches more than 12 percent, and the 28-day abrasion loss of the wear resistance of the airport cement is not more than 3.00 kg/square meter.

Disclosure of Invention

The invention aims to provide a preparation method for producing airport cement by using a raw material with high iron content, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a preparation method for producing airport cement by using a raw material with high iron content comprises the following steps:

1. raw material proportioning: in a batching station of a raw material mill system, various raw materials are proportioned according to a production scheme, and are accurately batched by using a scale;

2. grinding raw materials: grinding the materials into fine powder by using a raw material grinding machine, and conveying the fine powder to a raw material storage tank for storage;

3. and (3) clinker firing: conveying the raw material fine powder to a preheater and a rotary kiln for calcination by using a conveying device to form clinker taking calcium silicate as a main component, and conveying the clinker to a clinker tank for storage;

4. cement batching: in a batching station of a cement mill system, the prepared raw materials and auxiliary raw materials are accurately batched by using a scale according to the proportion specified by a production scheme;

5. grinding cement: grinding the materials into cement fine powder finished products by using a cement grinding machine, and conveying the cement fine powder finished products to a cement storage tank for storage;

6. and (3) cement finished product: discharging materials under the cement tank, and ensuring the homogenization of cement through the matching of a plurality of tanks to obtain finished cement for airports, which can be used on the market and has uniform and stable quality;

wherein, the raw material ingredients in step 1 comprise limestone, coal gangue, waste silica powder and waste iron stone powder, and the weight parts of the raw material ingredients are as follows: 78-89 parts of limestone, 1.6-4.8 parts of coal gangue, 5.2-7.8 parts of waste silica powder and 4.2-6.5 parts of waste iron stone powder.

As a further scheme of the invention: the raw material proportioning raw materials in the step 1 comprise the following components in parts by weight: 80-87 parts of limestone, 2.5-3.8 parts of coal gangue, 5.6-6.8 parts of waste silica powder and 4.8-5.6 parts of waste iron stone powder.

As a still further scheme of the invention: the raw material proportioning raw materials in the step 1 comprise the following components in parts by weight: 85.6 parts of limestone, 3 parts of coal gangue, 6.4 parts of waste silica powder and 5 parts of waste iron stone powder.

As a still further scheme of the invention: the cement raw materials in the step 4 comprise cement raw materials and coal ash, and the weight parts of the raw materials are as follows: 88-99 parts of cement raw material and 2.8-4.2 parts of coal ash.

As a still further scheme of the invention: the cement raw materials in the step 4 comprise cement raw materials and coal ash, and the weight parts of the raw materials are as follows: 96.58 parts of cement raw materials and 3.42 parts of coal ash.

As a still further scheme of the invention: the transmission equipment in the step 2 comprises a lifter and an air chute

Compared with the prior art, the invention has the beneficial effects that: the cement obtained by the preparation method for producing the airport cement by using the high-iron-content raw material not only meets the airport use standard in various performances, but also is obviously superior to the existing airport cement in various index performances. The airport cement is ground after the special clinker meeting the airport cement standard is produced by using the high-content iron raw material, so that the main quality indexes of the cement, such as breaking strength, wear resistance and the like, can effectively meet the standard requirements, and the popularization and the promotion in the airport cement processing industry are facilitated.

Detailed Description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

in the embodiment of the invention, the preparation method for producing the airport cement by using the high-iron-content raw material comprises the following steps:

1. raw material proportioning: weighing quantitative limestone, coal gangue, waste silica powder and waste iron stone powder by using a weighing scale at a batching station of a raw material mill system, wherein 78 parts of limestone, 1.6 parts of coal gangue, 5.2 parts of waste silica powder and 4.2 parts of waste iron stone powder;

2. grinding raw materials: grinding the materials into fine powder by using a raw material grinding machine, and conveying the fine powder to a raw material storage tank for storage;

3. and (3) clinker firing: conveying the fine raw meal powder to a preheater and a rotary kiln for calcination by using a hoister, an air chute and the like to form clinker with calcium silicate as a main component, and conveying the clinker to a clinker tank for storage;

4. cement batching: in a batching station of a cement mill system, the prepared raw materials and auxiliary raw materials (coal ash) are proportioned according to a production scheme, wherein 88 parts of the cement raw materials and 2.8 parts of the coal ash are accurately batched by using a scale;

5. grinding cement: grinding the materials into cement fine powder finished products by using a cement grinding machine, and conveying the cement fine powder finished products to a cement storage tank for storage;

6. and (3) cement finished product: and discharging materials under the cement tank, and ensuring the homogenization of cement by matching a plurality of tanks to obtain the finished product of the airport cement with uniform and stable quality which can be used on the spot.

Example 2:

in the embodiment of the invention, the preparation method for producing the airport cement by using the high-iron-content raw material comprises the following steps:

1. raw material proportioning: weighing quantitative limestone, coal gangue, waste silica powder and waste iron stone powder by using a weighing scale at a batching station of a raw material mill system, wherein 89 parts of limestone, 4.8 parts of coal gangue, 7.8 parts of waste silica powder and 6.5 parts of waste iron stone powder;

2. grinding raw materials: grinding the materials into fine powder by using a raw material grinding machine, and conveying the fine powder to a raw material storage tank for storage;

3. and (3) clinker firing: conveying the fine raw meal powder to a preheater and a rotary kiln for calcination by using a hoister, an air chute and the like to form clinker with calcium silicate as a main component, and conveying the clinker to a clinker tank for storage;

4. cement batching: in a batching station of a cement mill system, the prepared raw materials and auxiliary raw materials (coal ash) are proportioned according to a production scheme, wherein 99 parts of the cement raw materials and 4.2 parts of the coal ash are accurately batched by using a scale;

5. grinding cement: grinding the materials into cement fine powder finished products by using a cement grinding machine, and conveying the cement fine powder finished products to a cement storage tank for storage;

6. and (3) cement finished product: and discharging materials under the cement tank, and ensuring the homogenization of cement by matching a plurality of tanks to obtain the finished product of the airport cement with uniform and stable quality which can be used on the spot.

Example 3:

in the embodiment of the invention, the preparation method for producing the airport cement by using the high-iron-content raw material comprises the following steps:

1. raw material proportioning: weighing quantitative limestone, coal gangue, waste silica powder and waste iron stone powder by using a weighing scale at a batching station of a raw material mill system, wherein 85.6 parts of limestone, 3 parts of coal gangue, 6.4 parts of waste silica powder and 5 parts of waste iron stone powder;

2. grinding raw materials: grinding the materials into fine powder by using a raw material grinding machine, and conveying the fine powder to a raw material storage tank for storage;

3. and (3) clinker firing: conveying the fine raw meal powder to a preheater and a rotary kiln for calcination by using a hoister, an air chute and the like to form clinker with calcium silicate as a main component, and conveying the clinker to a clinker tank for storage;

4. cement batching: in a batching station of a cement mill system, prepared raw materials and auxiliary raw materials (coal ash) are proportioned according to a production scheme, wherein 96.58 parts of cement raw materials and 3.42 parts of coal ash are accurately batched by using a scale;

5. grinding cement: grinding the materials into cement fine powder finished products by using a cement grinding machine, and conveying the cement fine powder finished products to a cement storage tank for storage;

6. and (3) cement finished product: and discharging materials under the cement tank, and ensuring the homogenization of cement by matching a plurality of tanks to obtain the finished product of the airport cement with uniform and stable quality which can be used on the spot.

After laboratory data testing and collection, the cements prepared in examples, 2 and 3 were compared with the conventional airport cement main technical parameters, and the table is as follows:

C4AF

C3A

KH

3 day compressive strength

28 compressive strength

Abrasion loss in 28 days

Airport cement

13.05

4.59

0.92

26.8Mpa

48.6Mpa

2.82kg/㎡

Example 1

12.42

3.77

1.15

22Mpa

46.5Mpa

2.90kg/㎡

Example 2

15.89

4.95

0.70

20Mpa

40.8Mpa

2.65kg/㎡

Example 3

13.68

4.47

0.92

26.5Mpa

49.3Mpa

2.79kg/㎡

The concrete experimental data comparison can show that the cement obtained by the preparation method for producing the airport cement by using the high-iron-content raw material not only meets the airport use standard in various performances, but also has the content of tetracalcium aluminoferrite up to more than 12%, ensures that the 28-day abrasion loss of the airport cement abrasion resistance is not more than 3.00kg per square meter, and simultaneously has various index performances obviously superior to the existing airport cement. The airport cement is ground after the special clinker meeting the airport cement standard is produced by using the high-content iron raw material, so that the main quality indexes of the cement, such as breaking strength, wear resistance and the like, can effectively meet the standard requirements, and the popularization and the promotion in the airport cement processing industry are facilitated.

Wherein, the raw material proportion and the cement ingredient in the example 3 are the best proposal. The raw material ingredients are the key points for realizing the performance of the cement clinker and the cement, and the formula of the raw material ingredients is finally determined after a plurality of ingredient experiments, so that the expected cement quality index is realized through the formula.

The raw material prepared by 85.6 parts of limestone, 3 parts of coal gangue, 6.4 parts of waste silica powder and 5 parts of waste iron stone powder has the following content indexes:

ingredients	Proportioning	Loss on ignition	Silicon dioxide	Aluminum oxide	Ferric oxide	Calcium oxide	Magnesium oxide	Alkali content
									Limestone	85.6	35.94	2.87	1.23	0.86	42.03	1.69	0.3
Coal gangue	3	0.53	1.43	0.79	0.09	0.04	0.02	0.06
									Waste silica powder	6.4	0.12	5.67	0.25	0.21	0.06	0.02	0.01
Scrap iron powder	5	0.04	2.76	2.76	1.7	0.03	0.04	0.05

The cement prepared by 96.58 parts of cement raw materials and 3.42 parts of coal ash has the following content indexes:

ingredients	Proportioning	Loss on ignition	Silicon dioxide	Aluminum oxide	Ferric oxide	Calcium oxide	Magnesium oxide	Alkali content
									Raw material	96.58	0.4	19.40	3.64	4.36	64.26	2.68	0.46
Coal ash	3.42	/	2.03	0.93	0.14	0.13	0.05	0.05

In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, in the description of the present invention, "a plurality" means two or more unless otherwise specified. A feature defined as "first," "second," etc. may explicitly or implicitly include one or more of the feature.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.