阅读说明：本技术 一种水泥熟料及其制备方法和应用 (Cement clinker and preparation method and application thereof ) 是由 吕鹏飞 董立国 孔祥勇 吕祥泉 胡景昆 杨雷 苏炎 刘占锋 杜延吉 姜维国 于 2019-12-05 设计创作，主要内容包括：本发明公开了一种水泥熟料及其制备方法和应用,属于水泥生产技术领域。该水泥熟料包括以下按照重量份计的组分：石灰石70~95份、煤矸石3~7份、页岩3~7份、选矿粉末2~6份、镍渣0.5~4份、煤灰0.5~4份、柠檬酸渣0.2~1.5份。本发明提供的水泥熟料,是利用一种工业废渣——柠檬酸渣作为矿化剂,在水泥熟料的生成过程中,柠檬酸渣在高温下可以分解成CaO和SO<Sub>2</Sub>气体,其能促进液相进一步生成并降低熟料的煅烧温度,提高生料的易烧性,降低煤耗,以及提高熟料的强度。另外,本发明可以对柠檬酸渣进行回收利用,其还解决了工业废渣环境污染的问题。(The invention discloses cement clinker and a preparation method and application thereof, and belongs to the technical field of cement production. The cement clinker comprises the following components in parts by weight: 70-95 parts of limestone, 3-7 parts of coal gangue, 3-7 parts of shale, 2-6 parts of mineral processing powder, 0.5-4 parts of nickel slag, 0.5-4 parts of coal ash and 0.2-1.5 parts of citric acid slag. The invention provides a cement clinker, which uses citric acid residue as mineralizer, and during the production of cement clinker, the citric acid residue can be decomposed into CaO and SO at high temperature 2 Gas, which promotes the further generation of liquid phase and lowers the calcination temperature of the clinker, improves the easy-burning property of the raw meal, reduces the coal consumption, and improves the strength of the clinker. In addition, the invention can recycle the citric acid residues and also solves the problem of environmental pollution caused by industrial waste residues.)

1. The cement clinker is characterized by comprising the following components in parts by weight: 70-95 parts of limestone, 3-7 parts of coal gangue, 3-7 parts of shale, 2-6 parts of mineral processing powder, 0.5-4 parts of nickel slag, 0.5-4 parts of coal ash and 0.2-1.5 parts of citric acid slag.

2. The cement clinker of claim 1, wherein the cement clinker comprises the following components in parts by weight: 80-90 parts of limestone, 4-6 parts of coal gangue, 4-6 parts of shale, 3-5 parts of mineral processing powder, 1-3 parts of nickel slag, 1-3 parts of coal ash and 0.5-1 part of citric acid slag.

3. A cement clinker according to claim 1 or 2, characterised in that the beneficiated powder contains SiO ₂45-55% of Al ₂O ₃15-25% of Fe ₂O ₃The mass content of the CaO is 8-12%, and the mass content of the CaO is 5-10%.

4. A cement clinker as claimed in claim 1 or 2, wherein SiO is present in said nickel slag ₂35-45% of Al ₂O ₃The mass content of the alloy is 3-6 percent, and Fe ₂O ₃The mass content of the composite is 35-45%, and the mass content of CaO is 3-6%.

5. A cement clinker as claimed in claim 1 or 2, wherein SiO is present in said coal ash ₂55-65% of Al ₂O ₃15-25% of Fe ₂O ₃The mass content of the composite is 5-8%, and the mass content of CaO is 5-8%.

6. The cement clinker according to claim 1 or 2, wherein the mass content of CaO in the citric acid residues is 30-40%, and SO is ₃The mass content of the composite is 48-58%.

7. A method for the preparation of cement clinker according to any of claims 1 to 6, characterized in that it comprises the following steps:

weighing limestone, coal gangue, shale, mineral processing powder, nickel slag, coal ash and citric acid slag according to the weight parts for later use;

mixing the limestone, the coal gangue, the shale, the mineral processing powder, the nickel slag, the coal ash and the citric acid slag together, and grinding to obtain raw material powder;

and calcining the raw material powder by taking the coal powder as a fuel to obtain cement clinker, and controlling the sulfur-alkali ratio of the cement clinker to be 0.6-1.

8. A cement clinker produced by the production method according to claim 7.

9. The cement clinker according to claim 8, wherein the cement clinker has a saturation ratio of 0.91 to 0.92, a silicon ratio of 2.6 to 2.7, an aluminum ratio of 1.5 to 1.6, and a free calcium content of 1.35 to 1.46%.

10. Use of a cement clinker as defined in any one of claims 1 to 6 and 8 to 9 as a building material.

Technical Field

The invention relates to the technical field of cement production, in particular to cement clinker and a preparation method and application thereof.

Background

The cement clinker is a semi-finished product which is prepared by using limestone, clay and iron raw materials as main raw materials, preparing raw materials according to a proper proportion, burning until part or all of the raw materials are molten, and cooling. The conventional cement clinker generally uses natural gypsum, fluorite, industrial chemicals, etc. as a mineralizer.

In addition, the citric acid residues are a chemical deposit generated when the citric acid is produced by lime method in food chemical industry, and if the citric acid residues are not treated, the environment can be seriously polluted.

However, mineralizers such as natural gypsum, fluorite, and industrial chemicals used in conventional cement clinker require consumption of natural resources, and thus, they are expensive and consume a large amount of coal.

Disclosure of Invention

It is an object of embodiments of the present invention to provide a cement clinker that solves the problems set forth in the background art above.

In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:

the cement clinker comprises the following components in parts by weight: 70-95 parts of limestone, 3-7 parts of coal gangue, 3-7 parts of shale, 2-6 parts of mineral processing powder, 0.5-4 parts of nickel slag, 0.5-4 parts of coal ash and 0.2-1.5 parts of citric acid slag.

As a preferable scheme of the embodiment of the invention, the cement clinker comprises the following components in parts by weight: 80-90 parts of limestone, 4-6 parts of coal gangue, 4-6 parts of shale, 3-5 parts of mineral processing powder, 1-3 parts of nickel slag, 1-3 parts of coal ash and 0.5-1 part of citric acid slag.

According to another preferable scheme of the embodiment of the invention, the beneficiation powder contains 45-55% by mass of SiO2, 15-25% by mass of Al2O3, 8-12% by mass of Fe2O3 and 5-10% by mass of CaO.

As another preferable scheme of the embodiment of the invention, the mass content of SiO2 in the nickel slag is 35-45%, the mass content of Al2O3 is 3-6%, the mass content of Fe2O3 is 35-45%, and the mass content of CaO is 3-6%.

According to another preferable scheme of the embodiment of the invention, the mass content of SiO2 in the coal ash is 55-65%, the mass content of Al2O3 is 15-25%, the mass content of Fe2O3 is 5-8%, and the mass content of CaO is 5-8%.

As another preferable scheme of the embodiment of the invention, the mass content of CaO in the citric acid residues is 30-40%, and the mass content of SO3 is 48-58%.

Another object of an embodiment of the present invention is to provide a method for preparing the above cement clinker, which includes the following steps:

weighing limestone, coal gangue, shale, mineral processing powder, nickel slag, coal ash and citric acid slag according to the weight parts for later use;

mixing the limestone, the coal gangue, the shale, the mineral processing powder, the nickel slag, the coal ash and the citric acid slag together, and grinding to obtain raw material powder;

and calcining the raw material powder by taking the coal powder as a fuel to obtain cement clinker, and controlling the sulfur-alkali ratio of the cement clinker to be 0.6-1.

Another object of the embodiments of the present invention is to provide a cement clinker prepared by the above preparation method.

As another preferable scheme of the embodiment of the invention, the saturation ratio of the cement clinker is 0.91-0.92, the silicon rate is 2.6-2.7, the aluminum rate is 1.5-1.6, and the content of free calcium is 1.35-1.46%.

It is a further object of embodiments of the present invention to provide a use of the above cement clinker as a building material.

Compared with the prior art, the embodiment of the invention has the beneficial effects that:

the embodiment of the invention provides a cement clinker, which is generated by using industrial waste residue-citric acid residue as a mineralizerIn the process, the citric acid residue can be decomposed into CaO and SO at high temperature ₂Gas, which promotes the further generation of liquid phase and lowers the calcination temperature of the clinker, improves the easy-burning property of the raw meal, reduces the coal consumption, and improves the strength of the clinker. In addition, the invention can recycle the citric acid residues, and also solves the problem of environmental pollution caused by industrial residues, so that cement enterprises develop to an environment-friendly way.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 of the 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.