Method for preparing cement raw material from steel production waste residues

Abstract

The invention discloses a method for preparing a cement raw material by using steel production waste residues. The method comprises the following steps: S1, crushing the steel production waste residues into particles; s2, adding limestone, sandstone, coal mine and clay into the crushed waste residues, and fully grinding to obtain a powdery mixture; s3, adding water and a water reducing agent into the powdery mixture at normal temperature, and stirring to form dry and thick paste; s4, pouring the paste into a granulator to prepare spherical particles until the surfaces of the particles are round and have no cracks and the particles are not adhered to one another, and standing until the particles are fully cured; and S5, pouring the fully cured spherical particles into clear water to be soaked, ensuring that salt in the spherical particles is fully leached out, fishing out, drying, grinding, finely grinding, and feeding a finished product raw material into a cement kiln to be sintered into cement. The cement raw material is prepared by replacing traditional iron oxide red powder with the steel waste slag, waste can be utilized, qualified products can be produced, meanwhile, the production cost can be saved, and preparation of the cement raw material is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of cement raw material preparation, in particular to a method for preparing cement raw material by utilizing waste slag from steel production. Background Art

[0002] Cement raw materials are materials that are ground to a certain fineness by mixing lime raw materials, clay raw materials and a small amount of correction raw materials (sometimes mineralizers, crystal seeds, etc. are added, and coal is added during vertical kiln production) in proportion. Its chemical composition varies with the type of cement, the quality of raw materials and fuel, the production method, the type of kiln and other production conditions. Cement raw materials have the form of raw material slurry, raw material powder, raw material balls and raw material blocks depending on the cement production method. They are respectively suitable for the requirements of wet, dry, semi-dry and semi-wet production. Regardless of the form of raw materials, the chemical composition is required to be stable, and the fineness and moisture must be guaranteed to meet the requirements of different production methods, so as not to affect the calcination of the kiln and the quality of clinker.

[0003] At present, in the production of cement, red iron powder is usually used as the iron correction raw material for the preparation of raw materials. The iron content is generally between 50-73%, which has a wide range. It is in powder form and has a high moisture content, which is not conducive to production control and has high production costs. Therefore, it is urgent to develop a method for preparing cement raw materials using steel production waste slag to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing cement raw material using waste slag from steel production, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for preparing cement raw material using steel production waste slag comprises the following steps:

[0007] S1: The steel production waste slag is crushed into particles. To ensure the relative stability of the iron content in the waste slag, a magnet is used to suck out the waste iron blocks during the crushing process;

[0008] S2: adding limestone, sandstone, coal, and clay to the crushed waste residue, and grinding them sufficiently to obtain a powdery mixture;

[0009] S3: adding water and a water reducing agent to the powdered mixture at room temperature and stirring into a dry and thick paste;

[0010] S4: Pour the paste into a granulator to make spherical particles, until the surface of the particles is round without cracks and the particles are not adhered to each other, and let it stand until it is fully solidified;

[0011] S5: Pour the fully solidified spherical particles into clean water and soak them to ensure that the salt in the spherical particles is fully leached out. After being taken out and dried, they are ground and then the finished raw materials are sent to the cement kiln to be burned into cement.

[0012] As a further solution of the present invention: in S1, the steel production waste slag is crushed into particles with a particle size of 2-3 cm.

[0013] As a further solution of the present invention: in S2, the weight ratio of the crushed waste slag, limestone, sandstone, coal mine and clay is: 6%: 60%: 15%: 9%: 10%.

[0014] As a further solution of the present invention: in S3, the precise amount of water and water reducing agent is based on the convenience of granulation, and the weight ratio is 10:1.

[0015] As a further solution of the present invention: in S4, the particle size of the spherical particles is 10-15 mm, and the standard of sufficient solidification is that the spherical particles do not disintegrate or become muddy when immersed in water.

[0016] As a further solution of the present invention: in S5, the soaking time in clean water is 1-1.5 hours, the soaking solid-liquid ratio is 1:5, and the drying temperature is 120-150° C., and the drying time is 20-30 minutes.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention uses steel waste slag as a raw material to prepare cement raw material. The steel waste slag is in block shape, has stable chemical composition, and has low attached water content, thus avoiding the step of turning over or drying, greatly reducing labor intensity. Furthermore, the iron element in the steel waste slag exists in the form of ferrous ions, which release heat during the process of converting ferrous ions into ferric iron, thereby reducing the amount of coal used and saving costs. The present invention uses steel waste slag instead of traditional iron ore red powder to prepare cement raw material, which can not only utilize waste and produce qualified products, but also save production costs, and is beneficial to the preparation of cement raw material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a process flow chart of a method for preparing cement raw material by utilizing waste slag from steel production. DETAILED DESCRIPTION

[0020] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0021] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0022] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0023] Embodiment 1

[0024] See also Figure 1 A method for preparing cement raw material using steel production waste slag comprises the following steps:

[0025] S1: The steel production waste slag is crushed into particles. To ensure the relative stability of the iron content in the waste slag, a magnet is used to suck out the waste iron blocks during the crushing process;

[0026] S2: adding limestone, sandstone, coal, and clay to the crushed waste residue, and grinding them sufficiently to obtain a powdery mixture;

[0027] S3: adding water and a water reducing agent to the powdered mixture at room temperature and stirring into a dry and thick paste;

[0028] S4: Pour the paste into a granulator to make spherical particles, until the surface of the particles is round without cracks and the particles are not adhered to each other, and let it stand until it is fully solidified;

[0029] S5: Pour the fully solidified spherical particles into clean water and soak them to ensure that the salt in the spherical particles is fully leached out. After being taken out and dried, they are ground and then the finished raw materials are sent to the cement kiln to be burned into cement.

[0030] Preferably, in this embodiment, in S1, the steel production waste slag is crushed into particles with a particle size of 2-3 cm.

[0031] Preferably, in this embodiment, in S2, the weight ratio of the crushed waste slag, limestone, sandstone, coal mine and clay is: 6%: 60%: 15%: 9%: 10%.

[0032] It should be specifically noted that: by further limiting S1 and S2, in S1, the steel production waste slag is crushed to a granular particle size of 2-3 cm, and in S2, the weight ratio of the crushed waste slag, limestone, sandstone, coal mine and clay is: 6%: 60%: 15%: 9%: 10%, so as to better realize the preparation of cement raw material.

[0033] Embodiment 2

[0034] See also Figure 1 A method for preparing cement raw material using steel production waste slag comprises the following steps:

[0035] S1: The steel production waste slag is crushed into particles. To ensure the relative stability of the iron content in the waste slag, a magnet is used to suck out the waste iron blocks during the crushing process;

[0036] S2: adding limestone, sandstone, coal, and clay to the crushed waste residue, and grinding them sufficiently to obtain a powdery mixture;

[0037] S3: adding water and a water reducing agent to the powdered mixture at room temperature and stirring into a dry and thick paste;

[0038] S4: Pour the paste into a granulator to make spherical particles, until the surface of the particles is round without cracks and the particles are not adhered to each other, and let it stand until it is fully solidified;

[0039] S5: Pour the fully solidified spherical particles into clean water and soak them to ensure that the salt in the spherical particles is fully leached out. After being taken out and dried, they are ground and then the finished raw materials are sent to the cement kiln to be burned into cement.

[0040] Preferably, in this embodiment, in S1, the steel production waste slag is crushed into particles with a particle size of 2-3 cm.

[0041] Preferably, in this embodiment, in S2, the weight ratio of the crushed waste slag, limestone, sandstone, coal mine and clay is: 6%: 60%: 15%: 9%: 10%.

[0042] Preferably, in this embodiment, in S3, the precise amount of water and water reducing agent is based on the convenience of granulation, and the weight ratio is 10:1.

[0043] Preferably, in this embodiment, in S4, the particle size of the spherical particles is 10-15 mm, and the standard of sufficient solidification is that the spherical particles do not disintegrate or become muddy when immersed in water.

[0044] It should be specifically noted that: compared with Example 1, this embodiment further limits S3 and S4. In S3, the precise amount of water and water reducer is based on the convenience of granulation, and the weight ratio is 10:1. In S4, the particle size of the spherical particles is 10-15 mm, and the standard of sufficient solidification is based on not disintegrating or muddying when immersed in water, so as to better realize the preparation of cement raw material.

[0045] Embodiment 3

[0046] See also Figure 1 A method for preparing cement raw material using steel production waste slag comprises the following steps:

[0047] S1: The steel production waste slag is crushed into particles. To ensure the relative stability of the iron content in the waste slag, a magnet is used to suck out the waste iron blocks during the crushing process;

[0048] S2: adding limestone, sandstone, coal, and clay to the crushed waste residue, and grinding them sufficiently to obtain a powdery mixture;

[0049] S3: adding water and a water reducing agent to the powdered mixture at room temperature and stirring into a dry and thick paste;

[0050] S4: Pour the paste into a granulator to make spherical particles, until the surface of the particles is round without cracks and the particles are not adhered to each other, and let it stand until it is fully solidified;

[0051] S5: Pour the fully solidified spherical particles into clean water and soak them to ensure that the salt in the spherical particles is fully leached out. After being taken out and dried, they are ground and then the finished raw materials are sent to the cement kiln to be burned into cement.

[0052] Preferably, in this embodiment, in S1, the steel production waste slag is crushed into particles with a particle size of 2-3 cm.

[0053] Preferably, in this embodiment, in S2, the weight ratio of the crushed waste slag, limestone, sandstone, coal mine and clay is: 6%: 60%: 15%: 9%: 10%.

[0054] Preferably, in this embodiment, in S3, the precise amount of water and water reducing agent is based on the convenience of granulation, and the weight ratio is 10:1.

[0055] Preferably, in this embodiment, in S4, the particle size of the spherical particles is 10-15 mm, and the standard of sufficient solidification is that the spherical particles do not disintegrate or become muddy when immersed in water.

[0056] Preferably, in this embodiment, in S5, the soaking time in clean water is 1-1.5 hours, the soaking solid-liquid ratio is 1:5, and the drying temperature is 120-150° C., and the drying time is 20-30 minutes.

[0057] It should be specifically noted that: compared with Example 2, this example further limits S5. In S5, the soaking time in clean water is 1-1.5 hours, the soaking solid-liquid ratio is 1:5, and the drying temperature is 120-150°C, and the drying time is 20-30 minutes, so as to better realize the preparation of cement raw material.

[0058] It should be particularly noted that: the present invention uses steel waste slag as raw material to prepare cement raw material. The steel waste slag is in block shape, has stable chemical composition, and has low attached moisture, which avoids the steps of turning over or drying, greatly reducing labor intensity. In addition, the iron element in the steel waste slag exists in the form of ferrous ions, and releases heat during the process of converting ferrous iron into ferric iron, which can reduce the amount of coal used and save costs. The present invention uses steel waste slag instead of traditional iron ore red powder to prepare cement raw material, which can not only utilize waste and produce qualified products, but also save production costs, which is beneficial to the preparation of cement raw material.

[0059] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0060] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for preparing cement raw material using waste slag from steel production, It is characterized in that The following steps are involved: S1: The steel production waste slag is crushed into particles. To ensure the relative stability of the iron content in the waste slag, a magnet is used to suck out the waste iron blocks during the crushing process; S2: adding limestone, sandstone, coal, and clay to the crushed waste residue, and grinding them sufficiently to obtain a powdery mixture; S3: adding water and a water reducing agent to the powdered mixture at room temperature and stirring into a dry and thick paste; S4: Pour the paste into a granulator to make spherical particles, until the surface of the particles is round without cracks and the particles are not adhered to each other, and let it stand until it is fully solidified; S5: Pour the fully solidified spherical particles into clean water and soak them to ensure that the salt in the spherical particles is fully leached out. After being taken out and dried, they are ground and then the finished raw materials are sent to the cement kiln to be burned into cement.

2. The method for preparing cement raw material by using waste slag from steel production according to claim 1, It is characterized in that In S1, steel production waste slag is crushed into granules with a particle size of 2-3 cm.

3. The method for preparing cement raw material by using waste slag from steel production according to claim 1, It is characterized in that In S2, the weight ratio of the crushed waste slag, limestone, sandstone, coal mine and clay is: 6%: 60%: 15%: 9%: 10%.

4. The method for preparing cement raw material by using waste slag from steel production according to claim 1, It is characterized in that In S3, the exact amount of water and water reducing agent is based on the convenience of granulation, and the weight ratio is 10:

1.

5. The method for preparing cement raw material by using waste slag from steel production according to claim 1, It is characterized in that In S4, the particle size of the spherical particles is 10-15 mm, and the standard of sufficient solidification is that they do not disintegrate or become muddy when immersed in water.

6. The method for preparing cement raw material by using waste slag from steel production according to claim 1, It is characterized in that In S5, the soaking time in clean water is 1-1.5 hours, the soaking solid-liquid ratio is 1:5, and the drying temperature is 120-150°C, and the drying time is 20-30 minutes.

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