CN110453067B - Preparation process of fluorine-containing iron ore roasted pellets - Google Patents
Preparation process of fluorine-containing iron ore roasted pellets Download PDFInfo
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- CN110453067B CN110453067B CN201910860358.4A CN201910860358A CN110453067B CN 110453067 B CN110453067 B CN 110453067B CN 201910860358 A CN201910860358 A CN 201910860358A CN 110453067 B CN110453067 B CN 110453067B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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Abstract
The invention discloses a preparation process of a fluorine-containing iron ore roasted pellet, which belongs to the field of ferrous metallurgy and comprises the following steps: (1) preparing raw materials according to the following components in percentage by mass: 70-90% of fluorine-containing iron concentrate and 10-30% of specularite, wherein the total amount of the fluorine-containing iron concentrate and the specularite is 100%, and the binder accounts for 0.5-3% of the total amount of the fluorine-containing iron concentrate and the specularite; (2) uniformly mixing the raw materials to prepare green balls; (3) drying and preheating the green pellets to obtain preheated pellets; (5) and roasting the preheated pellets to obtain finished pellets. The specularite with poor sinterability and the fluorine-containing iron ore concentrate with poor roasting performance are mixed to prepare the pellet, so that the fluorine content in the mixture is reduced, the compressive strength of the pellet is improved from 2463N/P to 2955N/P, the roasting temperature range is increased to 100 ℃, the preheating temperature is reduced by 20 ℃, the preheating time is reduced by 2min, and the problems of narrow roasting temperature range, low compressive strength of finished pellets and difficult production organization in the roasting process of the fluorine-containing iron ore pellet are well solved.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and particularly relates to a preparation process of a fluorine-containing iron ore roasted pellet.
Background
The fluorine-containing iron ore is mainly distributed in Mongolia Baiyunebo, Huanggang and other areas in China, and is also distributed in Mongolia. The fluorine-containing iron ore is mainly used as a production raw material of a steel-coated group. Along with the development of economy in China and the enlargement of the scale of the iron and steel industry, the demand of iron ore resources is continuously increased, and the quantity of high-quality iron ores imported in China and abroad is also increased year by year. However, since the Bao Steel group is located in inland areas, only the fluorine-containing iron ore can be mainly used for production in consideration of transportation cost and economic benefit, and the fluorine-containing iron ore which is a special resource has many problems in the production process.
Iron ore pellets are one of important raw materials for blast furnace smelting, and research and production practices prove that adding acid pellets into high-alkalinity sinter ore is a reasonable blast furnace burden structure. However, the problems of narrow roasting temperature range, low compressive strength of finished pellets and the like exist in the process of preparing the fluorine-containing iron ore pellets, so that the organization is difficult in the production of the fluorine-containing iron ore pellets. The reason for this is that the fluorine-containing iron ore contains a large amount of low-melting-point substances containing fluorine, potassium, sodium, and the like, and a large amount of liquid phase appears at a high temperature, and the amount of liquid phase has an important influence on the pellet strength, and the pellet strength is lowered by too much liquid phase. The excessive liquid phase generated in the roasting process of the fluorine-containing iron ore pellets is the main reason for lower pressure resistance of the pellets.
In order to improve the roasting performance of the iron ore pellets containing fluorine, a great deal of research is carried out by related researchers, and the main measures are provided for adding the iron ore concentrate containing no fluorine and adding substances such as magnesium oxide. Although the problem in production can be relieved to a certain extent by reasonably matching the fluorine-free iron concentrate, the economic benefit of production is reduced due to the reasons of cost, freight cost and the like. The addition of magnesium oxide and dolomite can increase the roasting temperature range and the softening temperature, but also has the problems of reducing the strength of finished balls and the like.
The invention is especially provided for solving the problems of narrow roasting temperature range, low compressive strength of finished pellets, difficult production organization and the like in the roasting process of the fluorine-containing iron ore pellets.
Disclosure of Invention
Aiming at the problems of narrow roasting interval, low compressive strength of finished pellets and the like in the production process of the fluorine-containing iron ore pellets in the prior art, the invention aims to provide a preparation process of the fluorine-containing iron ore roasted pellets.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation process of a fluorine-containing iron ore roasted pellet comprises the following steps:
(1) preparing the following components in percentage by mass: 70-90% of fluorine-containing iron concentrate and 10-30% of specularite, wherein the total amount of the fluorine-containing iron concentrate and the specularite is 100%, and the binder accounts for 0.5-3% of the total amount of the fluorine-containing iron concentrate and the specularite;
(2) uniformly mixing the raw materials to prepare green balls;
(3) drying and preheating the green pellets to obtain preheated pellets;
(4) and roasting the preheated pellets to obtain roasted pellets.
Further, in the step (1), the fluorine-containing iron ore concentrate with the granularity smaller than 200 meshes has a mass percentage content of more than or equal to 70%.
Further, in the step (1), the specularite with the granularity smaller than 200 meshes is more than or equal to 70% in percentage by mass.
Further, in the step (1), the binder added in the pelletizing process is any one of bentonite, an organic binder and a composite binder.
Further, in the step (2), the diameter of the green ball is 8-20 mm.
Further, in the step (3), the drying temperature is 200-400 ℃ and the time is 10-60 min.
Further, in the step (4), the preheating temperature is 800-950 ℃, and the time is 10-60 min.
Further, in the step (4), the roasting temperature is 1080-1250 ℃, and the roasting time is 8-60 min.
Specularite has high iron-containing grade, low price, good crystallization and compact structure, belongs to hematite, but the problems of high roasting temperature, difficult formation of low-melting-point substances, poor sinterability and the like exist in the preparation of specularite pellets. The property of the specularite is opposite to that of the fluorine-containing iron ore, so that the roasting performance of the fluorine-containing iron ore pellets can be effectively improved by adding the specularite.
The invention has the advantages that:
the specularite with poor sinterability and the fluorine-containing iron ore concentrate with poor roasting performance are mixed to prepare the pellet, so that the fluorine content in the mixture is reduced, the compressive strength of the pellet is improved from 2463N/P to 2955N/P, the roasting temperature range is increased to be more than 100 ℃, the preheating temperature is reduced by 20 ℃, the preheating time is reduced by 2min, and the problems of narrow roasting temperature range, low compressive strength of finished pellets and difficult production organization in the roasting process of the fluorine-containing iron ore pellet are solved.
Drawings
FIG. 1 is a flow chart of the preparation process of the fluorine-containing iron ore roasted pellets of the present invention.
Detailed Description
The following examples further illustrate embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.
The invention relates to a preparation process of a fluorine-containing iron ore roasted pellet, which comprises the following steps:
70-90 wt% of fluorine-containing iron ore concentrate and 10-30 wt% of specularite are added with 0.5-3 wt% of bentonite and mixed to form a mixture, the mixture is pelletized on a pelletizer, the prepared green pellets are dried and then are carried out in a horizontal tubular electric furnace, and the compressive strength of the pellets is measured on a 10.0KN intelligent pellet press.
Comparative example 1
In a crude ore pellet test without adding specularite, the consumption of bentonite is 1.75 percent, and the compressive strength of a finished pellet is 1864N/P under the conditions of preheating temperature of 920 ℃, preheating time of 16min, roasting temperature of 1050 ℃ and roasting time of 10 min.
Comparative example 2
In a crude ore pellet test without adding specularite, the consumption of bentonite is 1.75%, and the compressive strength of a finished product pellet is 2463N/P under the conditions of preheating temperature of 920 ℃, preheating time of 16min, roasting temperature of 1080 ℃ and roasting time of 10 min.
Comparative example 3
In the test of the crude ore pellets without adding specularite, the consumption of the bentonite is 1.75 percent, and the compressive strength of the finished product pellets is 2389N/P under the conditions of the preheating temperature of 920 ℃, the preheating time of 16min, the roasting temperature of 1120 ℃ and the roasting time of 10 min.
Comparative example 4
In the crude ore pellet test without adding specularite, the bentonite consumption is 1.75%, and the finished pellet compressive strength is 2246N/P under the conditions of the preheating temperature of 920 ℃, the preheating time of 16min, the roasting temperature of 1150 ℃ and the roasting time of 10 min.
Comparative example 5
In the test of the crude ore pellets without adding specularite, the consumption of the bentonite is 1.75 percent, and the compressive strength of the finished product pellets is 2198N/P under the conditions of the preheating temperature of 920 ℃, the preheating time of 16min, the roasting temperature of 1180 ℃ and the roasting time of 10 min.
TABLE 1 statistical table of test results of comparative examples 1 to 5
As can be seen from the test results in Table 1, when no specularite is added, the compressive strength of the fluorine-containing pellet ore is low and cannot reach more than 2500N/P, and the strength of the roasted pellet is reduced along with the rise of the roasting temperature, and the suitable roasting temperature range is narrow, so that the production is difficult to organize, and the production operation difficulty is increased.
Example 1
Adding 10% specularite, wherein the bentonite consumption is 1.75%, and under the conditions of preheating temperature of 900 ℃, preheating time of 16min, roasting temperature of 1080 ℃, and roasting time of 10min, the compressive strength of the finished ball is 2793N/P.
Example 2
15 percent of specularite is added, the dosage of bentonite is 1.75 percent, and the compressive strength of the finished product ball is 2966N/P under the conditions of preheating temperature of 900 ℃, preheating time of 16min, roasting temperature of 1080 ℃ and roasting time of 10 min.
Example 3
Adding 10% specularite, wherein the bentonite consumption is 1.75%, and the compressive strength of the finished product ball is 2331N/P under the conditions of preheating temperature of 900 ℃, preheating time of 14min, roasting temperature of 1050 ℃ and roasting time of 10 min.
Example 4
Adding 10% specularite, wherein the bentonite consumption is 1.75%, and the compressive strength of the finished product ball is 2955N/P under the conditions of preheating temperature of 900 ℃, preheating time of 14min, roasting temperature of 1080 ℃ and roasting time of 10 min.
Example 5
Adding 10% specularite, wherein the bentonite content is 1.75%, and under the conditions of preheating temperature of 900 ℃, preheating time of 14min, roasting temperature of 1120 ℃, and roasting time of 10min, the compressive strength of the finished ball is 3015N/P.
Example 6
Adding 10% specularite, the bentonite dosage is 1.75%, under the conditions of preheating temperature of 900 ℃, preheating time of 14min, roasting temperature of 1150 ℃ and roasting time of 10min, the compressive strength of the finished product ball is 2931N/P.
Example 7
Adding 10% specularite, wherein the bentonite consumption is 1.75%, and under the conditions of preheating temperature of 900 ℃, preheating time of 14min, roasting temperature of 1180 ℃ and roasting time of 10min, the compressive strength of the finished ball is 3027N/P.
Example 8
The compression strength of the finished product ball is 2572N/P under the conditions of the preheating temperature of 900 ℃, the preheating time of 14min, the roasting temperature of 1220 ℃ and the roasting time of 10min by adding 10 percent of specularite and the bentonite with the dosage of 1.75 percent.
TABLE 2 statistical tables of test results of examples 1 to 8
The test result shows that the compressive strength of the finished product ball is obviously improved after the specularite is added, the strength of the finished product ball can reach more than 2500N/P after 10 percent of specularite is added, the compressive strength of partial finished product ball is more than 3000N/P, the suitable roasting temperature range is widened to more than 100 ℃, and the problems of narrow roasting range and low compressive strength of the finished product ball of the fluorine-containing pellet are solved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. Modifications and variations that may occur to those skilled in the art without departing from the spirit and scope of the invention are to be considered as within the scope of the invention.
Claims (8)
1. The preparation process of the fluorine-containing iron ore roasted pellets is characterized by comprising the following steps of:
(1) preparing the following components in percentage by mass: 70-90% of fluorine-containing iron concentrate and specular iron
10-15% of ore, 100% of the total amount of the fluorine-containing iron concentrate and the specularite, and a binder accounting for 0.5-3% of the total amount of the fluorine-containing iron concentrate and the specularite;
(2) uniformly mixing the raw materials to prepare green balls;
(3) drying and preheating the green pellets to obtain preheated pellets;
(4) and roasting the preheated pellets to obtain roasted pellets.
2. The process for preparing the roasted pellets of fluorine-containing iron ore as claimed in claim 1, wherein in the step (1), the mass percentage content of the fluorine-containing iron concentrate with the granularity of less than 200 meshes is not less than 70%.
3. The process for preparing the pyrite-containing roasted pellet as claimed in claim 1, wherein in the step (1), the specularite with a particle size of less than 200 meshes is not less than 70% by mass.
4. The process for preparing the roasted pellets of fluorine-containing iron ore according to claim 1, wherein in the step (1), the binder added in the pelletizing process is one or more of bentonite, organic binder and composite binder.
5. The process for preparing the pyrite-containing roasted pellet as claimed in claim 1, wherein in the step (2), the diameter of the green pellet is 8-20 mm.
6. The process for preparing the roasted pellets of fluorine-containing iron ore according to claim 1, wherein in the step (3), the drying temperature is 200 to 400 ℃ and the drying time is 10 to 60 mm.
7. The process for preparing the roasted pellets of fluorine-containing iron ore according to claim 1, wherein in the step (3), the preheating temperature is 800 to 950 ℃ and the time is 10 to 60 min.
8. The process for preparing the roasted pellets of fluorine-containing iron ore according to claim 1, wherein in the step (4), the roasting temperature is 1080-1250 ℃ and the roasting time is 8-60 min.
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