CN108191272B

CN108191272B - Application of mine crack soil in production of cement clinker

Info

Publication number: CN108191272B
Application number: CN201711365680.7A
Authority: CN
Inventors: 张琴琴; 林永权; 任兵建; 梁乾; 尹佳芝; 岳琴; 黄洁玲
Original assignee: China Resources Cement Technology R&D Co Ltd
Current assignee: China Resources Cement Technology R&D Co Ltd
Priority date: 2017-12-18
Filing date: 2017-12-18
Publication date: 2021-06-11
Anticipated expiration: 2037-12-18
Also published as: CN108191272A

Abstract

The invention discloses an application of mine crack soil in producing cement clinker, wherein raw materials of raw materials comprise limestone, crack soil, high-silicon raw materials and copper slag; the mixing amount of the crack soil is 5-20%, the mixing amount of the limestone is 75-82%, and the third rate value is KH: 0.92 ± 0.02, SM: 2.25 ± 0.10, IM: 1.40 plus or minus 0.10; the crack soil is sandwiched soil mixed in ore, and contains free water 16-20% and SiO₂ 30‑47％、Al₂O₃ 10‑14％、Fe₂O₃5-7% of CaO and 14-25% of CaO. In the invention, the crack soil is doped into the limestone to prepare the cement clinker, so that the use amount of the limestone is reduced; the crack soil can also completely replace expensive aluminum correction materials and partially replace clay and iron correction raw materials, so that the types of ingredients are reduced, the ingredient cost is saved, the production flow is simplified, and the high-strength cement clinker is prepared.

Description

Application of mine crack soil in production of cement clinker

Technical Field

The invention belongs to the field of cement clinker production, and particularly relates to application of waste material mine crack soil in cement clinker production.

Background

The preparation method of the silicate cement clinker mainly comprises two steps of burdening and calcining. At present, the calcination of the portland cement clinker has become a mature technology commonly used in the industry, the ingredients also have guidance of a complete system and teaching materials, and the ingredients mainly adopt limestone, clay, an iron correction raw material, an aluminum correction raw material, other mixed materials and the like. Generally, when clinker is prepared, four or more raw materials are adopted for blending to achieve three required value indexes, and an iron correction raw material, an aluminum correction raw material and clay are purchased from the outside, so that the price is high, and the problems of transportation and stacking exist.

Limestone is a main raw material for producing clinker, mine resources are more and more precious according to the current environment-friendly requirement, the cost for exploiting limestone is increased, high-grade limestone is reduced year by year, the batching cost is increased, and the quality of the produced clinker is not very good. If the dosage of limestone in the batching can be reduced, the types of raw materials in the batching are reduced, the batching cost can be reduced, the batching flow can be simplified, the resources are saved, and the production efficiency is improved.

At present, in the process of limestone mining, a waste soil resource is generated and is characterized by high calcium, high aluminum and high iron, and the waste soil is interlayer soil mixed in ore and is named as crack soil. Generally, the resource is accompanied by a large amount of small stones due to its high yield, which cannot be used alone as limestone or clay, and which are disposed of as waste by mining personnel, and which also increase the waste disposal costs.

Disclosure of Invention

Aiming at the problem that the cost of the raw materials of the existing cement clinker is increasingly expensive, the invention aims to provide the application of the mine crack soil in the production of the cement clinker, and the following problems are solved emphatically: 1. because of the high calcium characteristic, the mine crack soil can be mixed into the limestone, so that the use amount of the limestone is reduced; 2. because of containing high aluminum and high iron, the mine crack soil can completely replace expensive aluminum correction materials and partially replace clay and iron correction raw materials; 3. after the mine crack soil is used, the using amount of expensive raw materials is reduced, the types of the raw materials required by the ingredients are reduced, and the transportation cost and the stacking space of the raw materials are reduced.

The purpose of the invention is realized by the following technical scheme:

the application of the mine crack soil in the production of cement clinker;

the raw materials of the raw material comprise limestone, crack soil, high-silicon raw material and copper slag; wherein, the mixing amount of the crack soil is 5-20%, the mixing amount of the limestone is 75-82%, and the third rate value is KH: 0.92 ± 0.02, SM: 2.25 ± 0.10, IM: 1.40 plus or minus 0.10;

the crack soil is interlayer soil mixed in the ore and is a waste soil resource generated in the limestone mining process; contains free water 16-20% and SiO₂ 30-47％、Al₂O₃ 10-14％、Fe₂O₃5-7 percent of CaO, 14-25 percent of CaO, and 20-25 percent of crystalline silicon, wherein Al₂O₃/Fe₂O₃1.9-2.3;

the content of CaO in the limestone is preferably more than or equal to 50 percent;

the used high silicon is a substance with high silicon content and less crystal silicon; in particular, SiO₂The content of (A) is 78-82%, the quartz content is 66-70%, and the ratio of mineral elements (quartz content/SiO)₂Content) less than 0.83;

grinding the raw materials, and controlling the fineness to be 22 +/-2% of 80 mu m of screen residue.

The calcination process was according to the existing clinker calcination process.

Compared with the prior art, the invention has the following advantages and effects:

in the invention, the crack soil is doped into the limestone to prepare the cement clinker, so that the use amount of the limestone is reduced; the crack soil can also completely replace expensive aluminum correction materials and partially replace clay and iron correction raw materials, so that the types of ingredients are reduced, the ingredient cost is saved, the production flow is simplified, and the high-strength cement clinker is prepared.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.

Examples

The application of the mine crack soil in the production of cement clinker;

the ingredients of the raw material and the fineness of the grinding are controlled as shown in the following table:

the ingredients are ground to corresponding fineness, and the content of free calcium and the compressive strength of 3d and 28d of the prepared clinker are shown in the following table by adopting a conventional calcination process of silicate clinker:

therefore, when the mixing amount of the crack soil adopted by the invention is within the range of 5-20%, the f-CaO of the prepared clinker is much lower than that of the clinker which is not mixed with the crack soil in the conventional ingredients, the 3d strength of the prepared clinker is more than 31MPa, the 28d strength of the prepared clinker is more than 62.0MPa, and the 3d strength of the prepared clinker is far greater than that of the clinker which is prepared by the conventional ingredients without adding the crack soil (the 3d strength is 29.0MPa, and the 28d strength is 57.5MPa), and the strength is far greater than that of the clinker which is prepared by the conventional ingredients without adding the crack soil (the GB/T21372-2008 silicate cement clinker, the 3d compressive strength of the general cement clinker is more than or equal to 26.0MPa, and the 28d compressive strength of the general cement is more than or equal to 52.5MPa), thereby realizing the recycling.

And (3) mechanism analysis: the mine crack soil adopted by the invention has SiO₂High content of crystalline silicon, wherein SiO is₂The content of the silicon is about 45 percent, the content of the crystalline silicon is about 22 percent, and the silicon can replace a clay ingredient; the aluminum/iron content ratio is about 2.0, and can replace aluminum correction materials; the clinker has certain content of CaO, so that the saturation of the ingredients is easy to realize the KH of 0.92 +/-0.02, the index requirements of higher saturation ratio, higher silicon rate and lower aluminum rate are met, the burnability of the raw material can be improved, the calcination can tend to the direction of generating a large amount of C3S, and finally the f-CaO content in the clinker is gradually reduced, the generation amount of C3S is large, and the strength of the clinker is improved.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims

1. The application of the mine crack soil in the production of cement clinker is characterized in that:

the raw material of the raw material consists of limestone, crack soil, high-silicon raw material and copper slag; wherein, the mixing amount of the crack soil is 20 percent, the mixing amount of the limestone is 75 percent, and the third rate value is KH: 0.914, SM: 2.30, IM: 1.32;

the crack soil contains 16-20% of free water and SiO₂ 30-47％、Al₂O₃ 10-14％、Fe₂O₃5-7 percent of CaO, 14-25 percent of CaO, and 20-25 percent of crystalline silicon, wherein Al₂O₃/Fe₂O₃Is 2.3;

grinding the raw materials, wherein the fineness is controlled to be 23.7 percent of the sieved residue with the fineness of 80 mu m;

the high-silicon raw material, SiO₂The content of (A) is 78-82%, the content of quartz is 66-70%, and the ratio of mineral elements is less than 0.83.

2. The use of the mine gap soil according to claim 1 in the production of cement clinker, wherein: the limestone contains more than or equal to 50 percent of CaO.