阅读说明：本技术 水泥熟料及其制备方法 (Cement clinker and preparation method thereof ) 是由 张纪云 田忠成 王建华 张春捷 于 2019-11-25 设计创作，主要内容包括：本发明涉及水泥熟料技术领域,具体涉及水泥熟料及其制备方法。本发明水泥熟料的原料包括：电石渣65-80份,石灰石2-15份,微硅粉3-9份,铁粉4.3-6.5份,硅石0-6.6份,炉灰渣7-9份。本发明将微硅粉全部或部分替代硅石作为硅质原料使用,大幅度降低微硅粉外倒量,降低了水泥硅质原料成本,还意外地提高了水泥熟料的强度、稳定性和粘结力。并且极大程度上降低了生产成本,达到了固废利用降本增效的目的。(The invention relates to the technical field of cement clinker, in particular to cement clinker and a preparation method thereof. The cement clinker comprises the following raw materials: 65-80 parts of carbide slag, 2-15 parts of limestone, 3-9 parts of micro silicon powder, 4.3-6.5 parts of iron powder, 0-6.6 parts of silica and 7-9 parts of furnace ash. The invention uses the micro silicon powder as the siliceous raw material to replace silica completely or partially, greatly reduces the pouring amount of the micro silicon powder, reduces the cost of the cement siliceous raw material, and also unexpectedly improves the strength, stability and cohesive force of the cement clinker. And the production cost is greatly reduced, and the aims of reducing cost and improving efficiency of solid waste utilization are achieved.)

1. The cement clinker is characterized by comprising the following raw materials in parts by weight: 65-80 parts of carbide slag, 2-15 parts of limestone, 3-9 parts of micro silicon powder, 4.3-6.5 parts of iron powder, 0-6.6 parts of silica and 7-9 parts of furnace ash.

2. The cement clinker of claim 1, wherein the raw materials comprise, in parts by weight: 70-75 parts of carbide slag, 5-10 parts of limestone, 3.5-8.8 parts of micro silicon powder, 4.5-5.5 parts of iron powder, 0-3.0 parts of silica and 7.5-8.5 parts of furnace ash;

preferably, the raw materials comprise the following components in parts by weight: 73.2 parts of carbide slag, 6.6 parts of limestone, 7.2 parts of micro silicon powder, 5.2 parts of iron powder and 7.8 parts of furnace ash slag.

3. The cement clinker according to claim 1 or 2, wherein the total weight of the raw materials is 100 parts.

4. A cement clinker according to any of claims 1 to 3, characterized in that the content of said micro silica fume is 3.5-9% by weight, preferably not more than 7.2-8.8%.

5. The cement clinker of claim 1, wherein the cement clinker is prepared from the following raw materials in percentage by weight: 6-7% of limestone, 7-9% of micro silicon powder, 4.5-5.5% of iron powder, 7.5-8.5% of furnace ash slag and the balance of carbide slag; the health-care food is preferably prepared from the following raw materials in percentage by weight: 73.2 percent of carbide slag, 6.6 percent of limestone, 7.2 percent of micro silicon powder, 5.2 percent of iron powder and 7.8 percent of furnace ash slag;

or the cement clinker is prepared from the following raw materials in percentage by weight: 6-7% of limestone, 3.5-4.5% of micro silicon powder, 5.5-6.5% of iron powder, 2-2.5% of silica, 7.5-8.5% of furnace ash and the balance of carbide slag.

6. The cement clinker according to any one of claims 1 to 5, wherein the cement clinker has a compressive strength of > 29MPa at 3d and > 56MPa at 28 d.

7. A process for producing cement clinker as claimed in any one of claims 1 to 6, which comprises mixing the raw materials in a predetermined ratio, pulverizing the mixture to obtain a raw cement material, and calcining the raw cement material to obtain cement clinker.

8. A method for producing cement clinker according to any one of claims 1 to 6, characterized by comprising:

mixing the raw materials except the micro silicon powder in proportion, and crushing to obtain a first mixture;

injecting the micro silicon powder into a warehouse or a batching room by utilizing compressed air, and batching the micro silicon powder and the first mixture by using a powder scale to prepare cement raw materials;

calcining the cement raw materials to prepare cement clinker;

preferably, the micro silicon powder is encrypted and then transported to a cement plant through a tanker truck.

9. A cement comprising the cement clinker as claimed in any one of claims 1 to 6.

10. Use of the cement clinker according to any one of claims 1 to 6 for the preparation of cement or in the construction field.

Technical Field

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

Background

The cement clinker is prepared with limestone, silicate cement clinker and iron material in certain proportion as main material, and through mixing, burning to melt partially or completely and cooling to obtain semi-finished product.

The cement clinker ingredients are generally mixed and proportioned by adopting calcium raw materials and various correction raw materials according to different cement clinker index requirements so as to achieve the purpose of realizing clinker with various indexes. Most of the existing cement clinker ingredients adopt calcareous raw materials, siliceous correcting raw materials, irony correcting raw materials and aluminous correcting raw materials, and the ingredients are put into a kiln for calcination.

The micro silicon powder is also called as silica fume, and the silicon powder is dust recovered from smoke gas produced by smelting metal silicon or ferrosilicon, has extremely fine granularity, most of which is less than 1um, and mainly contains silicon oxide, and has the advantages of low density, strong cohesiveness, large adhesive force and difficult sedimentation. At present, the additive is mainly applied to high-strength admixtures, refractory material additives, metallurgical pelletizing aids, cement admixture materials, chemical product dispersion separants and the like in the concrete industry at home and abroad, but the high-strength admixtures, the refractory material additives, the metallurgical pelletizing aids, the cement admixture materials, the chemical product dispersion separants and the like are all SiO₂The content has higher requirement (SiO)₂Content greater than 85% or 90%). At present, in the industry, part of the micro silicon powder is used for adding cement mill mixing materials and is mostly buried outwards.

Since the silica fume contains alkaline oxides such as sodium oxide and magnesium oxide, when the silica fume is used for preparing cement clinker, the calcination of the clinker is influenced, and the stability of the cement clinker is possibly reduced. Therefore, silica fume has not been successfully used in the production of cement clinker.

Disclosure of Invention

The invention provides a cement clinker, which uses silica as a siliceous raw material instead of silica, greatly reduces the pouring amount of silica powder, reduces the cost of the cement siliceous raw material, and also unexpectedly improves the compressive strength of the cement clinker.

Specifically, the invention provides a cement clinker, which comprises the following raw materials (namely raw materials) in parts by weight: 65-80 parts of carbide slag, 2-15 parts of limestone, 3-9 parts of micro silicon powder, 4.3-6.5 parts of iron powder, 0-6.6 parts of silica and 7-9 parts of furnace ash.

In some preferred embodiments of the present invention, the cement clinker comprises the following raw materials (i.e. raw materials) in parts by weight: carbide slag 70-75 parts, limestone 5-10 parts, micro silicon powder 3.5-8.8 parts, iron powder 4.5-5.5 parts, silica 0-3.0 parts and furnace ash 7.5-8.5 parts.

In some preferred embodiments of the present invention, the cement clinker comprises the following raw materials (i.e. raw materials) in parts by weight: 73.2 parts of carbide slag, 6.6 parts of limestone, 7.2 parts of micro silicon powder, 5.2 parts of iron powder and 7.8 parts of furnace ash slag.

Further, the cement clinker of the present invention has a total raw material (i.e., raw meal) weight of 100 parts.

In some preferred embodiments of the present invention, the cement clinker is prepared from carbide slag, limestone, silica fume, iron powder and furnace ash slag according to the above proportion.

Further, in some preferred embodiments of the present invention, the raw material of the cement clinker does not include silica, i.e. silica powder is used as the siliceous raw material instead of silica.

Researches show that when silica is completely replaced by micro-silica powder to be used as a siliceous raw material, the content of the micro-silica powder is not too high, otherwise, the stability of the clinker is easy to reduce, and the content of the micro-silica powder (which is the weight percentage of the total raw material of the cement clinker, the same applies hereinafter) is preferably 3.5-9%, and preferably not more than 7.2-8.8%, so that the original performance of the cement clinker can be ensured.

Surprisingly, the invention has found that the silica is completely replaced by the micro silicon powder to be used as the siliceous raw material, and the mixture ratio of the raw materials is optimized, so that the 3d compressive strength and 28d compressive strength of the cement clinker are obviously improved, and the stability and the binding power are also obviously improved. Experiments show that the cement clinker prepared by the invention has the compressive strength of more than 29Mpa at 3d and more than 56Mpa at 28d after being taken out of the kiln, and other indexes can reach the national standard requirements.

In some preferred embodiments of the present invention, the cement clinker is prepared from the following raw materials in percentage by weight: 6-7% of limestone, 7-9% of micro silicon powder, 4.5-5.5% of iron powder, 7.5-8.5% of furnace ash slag and the balance of carbide slag.

In some preferred embodiments of the present invention, the cement clinker is prepared from the following raw materials in percentage by weight: 6-7% of limestone, 3.5-4.5% of micro silicon powder, 5.5-6.5% of iron powder, 2-2.5% of silica, 7.5-8.5% of furnace ash and the balance of carbide slag.

In a preferred embodiment of the invention, the cement clinker is prepared from the following raw materials in percentage by weight: 73.2 percent of carbide slag, 6.6 percent of limestone, 7.2 percent of micro silicon powder, 5.2 percent of iron powder and 7.8 percent of furnace ash slag.

The cement clinker of the present invention can be prepared by a method conventional in the art.

The invention also provides a preparation method of the cement clinker, which comprises the steps of mixing the raw materials in proportion, crushing the raw materials to prepare cement raw materials, and calcining the raw materials to prepare the cement clinker.

Particularly, the micro silicon powder has the characteristics of extremely fine granularity, most of which is less than 1 μm, small density, strong caking property, large adhesive force and difficult sedimentation, so the micro silicon powder is difficult to be used in the industrial production of cement clinker. In addition, the micro silicon powder has the difficulty of higher transportation cost. Based on the problem, the invention further researches and discovers that the technical problem that industrialization is difficult to realize in the production of cement clinker is effectively solved and the transportation and storage costs are reduced by pulling and transporting the silica fume to a cement plant through a tank truck after the silica fume is encrypted, and pumping the silica fume into a warehouse or between batching rooms by utilizing compressed air to carry out batching through metering of a powder scale.

Specifically, the method for producing the cement clinker comprises the following steps:

mixing the raw materials except the micro silicon powder in proportion, and crushing to obtain a first mixture;

injecting the micro silicon powder into a warehouse or a batching room by utilizing compressed air, and batching the micro silicon powder and the first mixture by using a powder scale to prepare cement raw materials;

and calcining the cement raw materials to prepare the cement clinker.

Further, in the preparation method of the cement clinker, the silica fume is encrypted and then transported to a cement plant through a tank truck.

The cement has the advantage of high compressive strength in 3 days due to the cement clinker.

The invention replaces all or part of silica with the micro-silica powder, reasonably adjusts the proportion of the raw materials, and also unexpectedly improves the 3-day compressive strength performance of the cement clinker on the basis of meeting the original quality; and the production cost is greatly reduced, and the aims of reducing cost and improving efficiency of solid waste utilization are achieved.

In addition, the invention also solves the technical problem that the stability of the cement clinker is easy to reduce because silica is replaced by the micro silicon powder by reasonably adjusting the proportion of the raw materials.

The present invention also provides a cement comprising the cement clinker, and further, gypsum. For example, the cement clinker is mixed with gypsum and ground to obtain cement.

The invention also provides the application of the cement clinker in preparing cement or in the field of construction.

The implementation of the invention can use all the solid waste micro silicon powder of the smelting company for producing the cement clinker, and the amount of the solid waste is reduced by about 200 tons every day. The micro silicon powder contains about 8 percent of Fe₂O₃Thereby reducing the consumption of the iron powder in the raw material. The micro silicon powder does not need to be ground, the abrasion loss of the roller skin of the roller press is reduced, and the service cycle of the roller can be prolonged by more than one year; the micro silicon powder does not need to be ground, and the power consumption of the grinding of the raw material is reduced by 10 ℃.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications. The reagents or instruments used are conventional products available from regular distributors, not indicated by the manufacturer.

In the following examples, the silica fume used is transported to a cement plant by a tanker truck after being encrypted, and then the silica fume is pumped into a warehouse by compressed air or metered by a powder scale to be mixed in a mixing room.

In the following examples, the preparation of cement clinker comprises: mixing the raw materials except the micro silicon powder in proportion, and crushing to obtain a first mixture; injecting the micro silicon powder into a warehouse or a batching room by utilizing compressed air, and batching the micro silicon powder and the first mixture by using a powder scale to prepare cement raw materials; and calcining the cement raw materials to prepare the cement clinker. Calcination may be carried out using methods conventional in the art.