阅读说明：本技术 烧结料的制备工艺及烧结工艺 (Preparation process of sintering material and sintering process ) 是由 张立军 谭海波 洪翔 胡钢 龚艺杰 王才文 张启全 钱勇 于 2021-09-18 设计创作，主要内容包括：一种烧结料的制备工艺及烧结工艺,属于钢铁生产技术领域。烧结料的制备工艺包括：将铁料、第一熔剂、燃料和水进行第一次混合得到混合料,其中,第一熔剂中含有第一生石灰；将混合料和第二熔剂进行混合制粒得到烧结料,第二熔剂包括消石灰。烧结料的烧结工艺包括：将烧结料的制备工艺制得的烧结料进行烧结。烧结料的制备工艺能够提高制粒效果、改善烧结的透气性。(A preparation process and a sintering process of a sintering material belong to the technical field of steel production. The preparation process of the sintering material comprises the following steps: mixing iron material, a first flux, fuel and water for the first time to obtain a mixture, wherein the first flux contains first quicklime; and mixing and granulating the mixture and a second fusing agent to obtain the sintering material, wherein the second fusing agent comprises slaked lime. The sintering process of the sintering material comprises the following steps: sintering the sintering material prepared by the preparation process of the sintering material. The preparation process of the sintering material can improve the granulation effect and improve the sintering air permeability.)

1. A preparation process of a sintering material is characterized by comprising the following steps: mixing iron material, a first fusing agent, fuel and water for the first time to obtain a mixture, wherein the first fusing agent contains first quicklime; and mixing and granulating the mixture and a second fusing agent to obtain the sintering material, wherein the second fusing agent comprises slaked lime.

2. The preparation process of the sintering material according to claim 1, wherein the slaked lime is prepared by slaking second quick lime, the total mass of the first quick lime and the second quick lime is M, and the percentage of the mass of the second quick lime to M is 40-70%.

3. The preparation process of the sintering material according to claim 2, wherein the percentage of the mass of the second quicklime to the mass of the M is 50-70%.

4. The process for preparing sintered materials according to claim 2, wherein the percentage of the mass of the second quicklime to the mass of M is 50%.

5. The process for producing a sintered material according to any one of claims 1 to 4, wherein the iron material is 78 to 82 wt%, the fuel is 3 to 6 wt%, and the total of the first flux and the second flux is 13 to 17 wt%.

6. The process for preparing a sintered material according to claim 5, wherein the iron material is 80% by weight, the fuel is 4% by weight, and the sum of the first flux and the second flux is 16% by weight.

7. The process for preparing a sintered material according to any one of claims 1 to 4, wherein the fuel comprises at least one of coke and anthracite.

8. A sintering process of a sintering material is characterized by comprising the following steps: sintering the sintered material obtained by the process for producing a sintered material according to any one of claims 1 to 7.

Technical Field

The application relates to the technical field of steel production, in particular to a preparation process and a sintering process of a sintering material.

Background

In the prior art, the sintering raw materials (including iron materials, fuels, fluxes and the like) are completely mixed before a primary mixing cylinder, water is added into a primary mixing cylinder for mixing uniformly, and the mixture is granulated through a secondary mixing cylinder. However, such operations are generally poor in granulation and are not conducive to improving the sintering yield and quality.

In order to improve the sintering granulation effect, the proportion of the quick lime is mostly improved at present, and the quick lime absorbs water in the primary mixing cylinder and is digested into the slaked lime with the bonding effect, so that the granulation effect can be improved. But the proportion of the quicklime is improved to a limited extent under the control requirement of sintering R, and the sintering cost is greatly increased due to the improvement of the proportion of the quicklime.

Disclosure of Invention

The application provides a preparation process and a sintering process of a sintering material, which can improve the granulation effect and improve the sintering air permeability.

The embodiment of the application is realized as follows:

in a first aspect, an embodiment of the present application provides a preparation process of a sintering material, including: mixing iron material, a first flux, fuel and water for the first time to obtain a mixture, wherein the first flux contains first quicklime; and mixing and granulating the mixture and a second fusing agent to obtain the sintering material, wherein the second fusing agent comprises slaked lime.

In a second aspect, an embodiment of the present application provides a sintering process for a sintering material, including: sintering the sintering material prepared by the preparation process of the sintering material of the first aspect embodiment.

The preparation process and the sintering process of the sintering material provided by the embodiment of the application have at least the following beneficial effects:

mixing iron material, fuel, water and a first flux containing quicklime for the first time, reacting the quicklime with the water to generate slaked lime, and releasing heat in the reaction process to increase the temperature of the mixture so as to improve the air permeability of the mixture. The mixture is mixed with the second fusing agent containing the slaked lime for granulation, so that the granulation effect of the sintering material can be improved by utilizing the bonding effect of the slaked lime.

Detailed Description

Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

In order to improve the sintering granulation effect of the sintering material, the proportion of the quicklime is mostly improved at present, and the quicklime absorbs water and is digested into slaked lime in a primary mixing cylinder to have the bonding effect, so that the granulation effect can be improved. But the proportion of the quicklime is improved to a limited extent under the control requirement of sintering R, and the sintering cost is greatly increased due to the improvement of the proportion of the quicklime. In addition, the inventor of the application discovers in research that after the proportion of the quicklime is improved, a large amount of quicklime cannot be sufficiently digested, the quicklime can be wrapped in a granulation pellet in the granulation process, and the quicklime continues to absorb water, digest and expand in the pellet, so that the granulation pellet is broken, and the sintering breathability is affected.

In a first aspect, an embodiment of the present application provides a preparation process of a sintering material, including: mixing iron material, a first flux, fuel and water for the first time to obtain a mixture, wherein the first flux contains first quicklime; and mixing and granulating the mixture and a second fusing agent to obtain the sintering material, wherein the second fusing agent comprises slaked lime.

In some embodiments, the fuel includes at least one of coke and anthracite coal, either alone, or in combination.

Mixing iron material, fuel, water and a first flux containing quicklime for the first time, reacting the quicklime with the water to generate slaked lime, and releasing heat in the reaction process to increase the temperature of the mixture so as to improve the air permeability of the mixture. The mixture is mixed with the second fusing agent containing the slaked lime for granulation, so that the granulation effect of the sintering material can be improved by utilizing the bonding effect of the slaked lime.

In addition, the inventor of the present application has found in research that if quicklime is added during both the first mixing and the second mixing, the added quicklime is not sufficiently digested during the second mixing, and thus does not perform good adhesion, resulting in poor granulation. If slaked lime is added during the first mixing and the second mixing, the heat generated by slaking the quicklime cannot be utilized during the first mixing, so that the temperature of the mixture is lower, and finally the air permeability of the sintering material is reduced.

Further, in some embodiments, the slaked lime is prepared by slaking a second quick lime, the total mass of the first quick lime and the second quick lime is M, and the mass percentage of the second quick lime to M is 40-70%.

The inventor of the present application found in research that when the percentage of the mass of the second quicklime to M is greater than or equal to 20%, the sintering utilization coefficient starts to increase, and when the percentage of the mass of the second quicklime to M is 50%, the utilization coefficient reaches the highest value. When the mass of the second quicklime is more than 50% of the mass of the second quicklime, the sintering utilization coefficient begins to decrease. In order to improve the sintering utilization coefficient, in the embodiment of the application, the mass percentage of the second quicklime to the M is 40-70%.

Illustratively, the percentage of mass of the second quicklime to M is any one of 40%, 45%, 50%, 55%, 60%, 65%, and 70%, or a range between any two. Optionally, the mass percentage of the second quicklime to the M is 50-70%. Optionally, the percentage of the mass of the second quicklime to M is 50%.

In some embodiments, the iron material is 78 to 82% and the fuel is 3 to 6% by weight, and the sum of the first flux and the second flux is 13 to 17%.

Illustratively, the iron charge is any one of, or a range between any two of, 78%, 79%, 80%, 81%, and 82% by weight.

Illustratively, the fuel is any one of 3%, 4%, 5%, and 6% or a range between any two by weight percent.

Illustratively, the sum of the first and second fusing agents is any one of 13%, 14%, 15%, 16%, and 17%, or a range between any two.

Illustratively, the sum of the iron charge, the fuel, the first flux and the second flux is 100% by weight. For example, in some embodiments, the iron charge is 80% and the fuel is 4% and the sum of the first flux and the second flux is 16% by weight.

In a second aspect, an embodiment of the present application further provides a sintering process of a sintering material, including: sintering the sintering material prepared by the preparation process of the sintering material of the first aspect embodiment.

The sintering material prepared by the preparation process of the sintering material in the embodiment of the first aspect has good air permeability and is beneficial to sintering.

The preparation process and sintering process of the sintering material of the present application are further described in detail with reference to the following examples.

Example 1

The embodiment provides a preparation process of a sintering material, which comprises the following steps:

80kg of iron material, 5kg of coke powder, 5kg of dolomite powder and 9kg of quick lime are mixed with water for the first time to obtain a mixture.

Mixing 1kg of quicklime with 0.3kg of water, digesting for 10min to obtain slaked lime, mixing the slaked lime with the mixture, and granulating to obtain the sintered material.

The embodiment also provides a sintering process of the sintering material, which comprises the following steps:

the sintered material obtained in the present example was subjected to firing sintering at 1100 ℃ to obtain a sintered ore.

Example 2

The embodiment provides a preparation process of a sintering material, which comprises the following steps:

80kg of iron material, 5kg of coke powder, 5kg of dolomite powder and 8kg of quick lime are mixed with water for the first time to obtain a mixture.

Mixing 2kg of quicklime with 0.6kg of water, digesting for 10min to obtain slaked lime, mixing the slaked lime with the mixture, and granulating to obtain the sintered material.

The embodiment also provides a sintering process of the sintering material, which comprises the following steps:

the sintered material obtained in the present example was subjected to firing sintering at 1100 ℃ to obtain a sintered ore.

Example 3

The embodiment provides a preparation process of a sintering material, which comprises the following steps:

80kg of iron material, 5kg of coke powder, 5kg of dolomite powder and 7kg of quick lime are mixed with water for the first time to obtain a mixture.

Mixing 3kg of quicklime with 0.9kg of water, digesting for 10min to obtain slaked lime, mixing the slaked lime with the mixture, and granulating to obtain the sintered material.

The embodiment also provides a sintering process of the sintering material, which comprises the following steps:

the sintered material obtained in the present example was subjected to firing sintering at 1100 ℃ to obtain a sintered ore.

Example 4

The embodiment provides a preparation process of a sintering material, which comprises the following steps:

80kg of iron material, 5kg of coke powder, 5kg of dolomite powder and 6kg of quick lime are mixed with water for the first time to obtain a mixture.

Mixing 4kg of quicklime with 1.2kg of water, digesting for 10min to obtain slaked lime, mixing the slaked lime with the mixture, and granulating to obtain the sintered material.

The embodiment also provides a sintering process of the sintering material, which comprises the following steps:

the sintered material obtained in the present example was subjected to firing sintering at 1100 ℃ to obtain a sintered ore.

Example 5

The embodiment provides a preparation process of a sintering material, which comprises the following steps:

80kg of iron material, 5kg of coke powder, 5kg of dolomite powder and 5kg of quick lime are mixed with water for the first time to obtain a mixture.

Mixing 5kg of quicklime with 1.5kg of water, digesting for 10min to obtain slaked lime, mixing the slaked lime with the mixture, and granulating to obtain the sintered material.

The embodiment also provides a sintering process of the sintering material, which comprises the following steps:

the sintered material obtained in the present example was subjected to firing sintering at 1100 ℃ to obtain a sintered ore.

Example 6

The embodiment provides a preparation process of a sintering material, which comprises the following steps:

80kg of iron material, 5kg of coke powder, 5kg of dolomite powder and 4kg of quick lime are mixed with water for the first time to obtain a mixture.

Mixing 6kg of quicklime with 1.8kg of water, digesting for 10min to obtain slaked lime, mixing the slaked lime with the mixture, and granulating to obtain the sintered material.

The embodiment also provides a sintering process of the sintering material, which comprises the following steps:

the sintered material obtained in the present example was subjected to firing sintering at 1100 ℃ to obtain a sintered ore.

Example 7

The embodiment provides a preparation process of a sintering material, which comprises the following steps:

80kg of iron material, 5kg of coke powder, 5kg of dolomite powder and 3kg of quick lime are mixed with water for the first time to obtain a mixture.

Mixing 7kg of quicklime with 2.1kg of water, digesting for 10min to obtain slaked lime, mixing the slaked lime with the mixture, and granulating to obtain the sintered material.

The embodiment also provides a sintering process of the sintering material, which comprises the following steps:

the sintered material obtained in the present example was subjected to firing sintering at 1100 ℃ to obtain a sintered ore.

Example 8

The embodiment provides a preparation process of a sintering material, which comprises the following steps:

80kg of iron material, 5kg of coke powder, 5kg of dolomite powder and 2kg of quick lime are mixed with water for the first time to obtain a mixture.

Mixing 8kg of quicklime and 2.4kg of water, digesting for 10min to obtain slaked lime, mixing the slaked lime and the mixture, and granulating to obtain the sintered material.

The embodiment also provides a sintering process of the sintering material, which comprises the following steps:

the sintered material obtained in the present example was subjected to firing sintering at 1100 ℃ to obtain a sintered ore.

Comparative example 1

The comparative example provides a process for preparing a frit comprising the steps of:

80kg of iron material, 5kg of coke powder, 5kg of dolomite powder and 5kg of quick lime are mixed with water for the first time to obtain a mixture.

5kg of quicklime and the mixture are mixed and granulated to obtain a sintering material.

The embodiment also provides a sintering process of the sintering material, which comprises the following steps:

the sintered material obtained in the present example was subjected to firing sintering at 1100 ℃ to obtain a sintered ore.

Comparative example 2

The comparative example provides a process for preparing a frit comprising the steps of:

5kg of quicklime is mixed with 1.5kg of water for digestion for 10min to obtain slaked lime, and then the slaked lime, 80kg of iron material, 5kg of coke powder and 5kg of dolomite powder are mixed with water for the first time to obtain a mixture.

Mixing 5kg of quicklime with 1.5kg of water, digesting for 10min to obtain slaked lime, mixing the slaked lime with the mixture, and granulating to obtain the sintered material.

The present comparative example also provides a sintering process for a frit comprising the steps of:

sintering the sintering material prepared in the comparative example at 1100 ℃ to obtain the sintered ore.

It is to be noted that the amounts of water added at the time of obtaining the mixed materials were the same in examples 1 to 8 and comparative examples 1 to 2.

Test examples

(1) The sintering utilization coefficients in the sintering processes of the sintered materials of examples 1 to 8 and comparative examples 1 to 2 were tested, and the results thereof are recorded in table 1.

TABLE 1 sintering utilization coefficient test results

As can be seen from the results of table 1, as the mass of the second quicklime increases in percentage to M, the sintering utilization coefficient starts to increase, reaches the highest value when the mass of the second quicklime is 50% in percentage to M, and starts to decrease when the mass of the second quicklime is more than 50% in percentage to M. The sintering utilization coefficient of the embodiments 4 to 7 is larger than that of the other embodiments of the present application, which shows that the percentage of the mass of the second quicklime to the mass of M is 40 to 70%, which is more favorable for improving the sintering utilization coefficient.

The foregoing is illustrative of the present application and is not to be construed as limiting thereof, as numerous modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.