CN110004261B - Preparation process of FeO in metallurgical slag - Google Patents
Preparation process of FeO in metallurgical slag Download PDFInfo
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- CN110004261B CN110004261B CN201910440651.5A CN201910440651A CN110004261B CN 110004261 B CN110004261 B CN 110004261B CN 201910440651 A CN201910440651 A CN 201910440651A CN 110004261 B CN110004261 B CN 110004261B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
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Abstract
The invention relates to a preparation process of FeO in metallurgical slag, belonging to the technical field of metallurgy. In order to solve the problem of unstable FeO prepared by the prior art, the invention provides a preparation process of FeO in metallurgical slag, which is to reduce iron powder and Fe2O3And SiO2Fully grinding and uniformly mixing to obtain a mixed material, adding carbon powder into the mixed material, heating to 1100-1500 ℃, and keeping the temperature for a certain time to generate stable FeO & SiO2Crushing and drying the product to obtain the slag ingredient containing stable FeO. FeO in the slag batching prepared by the invention has stable property and is not easy to be oxidized into ferric oxide in the air, thereby avoiding generating a large amount of non-FeO iron oxide in the slag. The preparation process has the advantages of short flow, simplicity in operation and low cost, can form a component close to actual metallurgical slag, and can meet the requirement of FeO required by the metallurgical slag when being applied to the field of metallurgy.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a preparation process of FeO in metallurgical slag.
Background
FeO plays a very important role in the metallurgical process, the content of FeO in the sintering ore is a comprehensive index for evaluating sintering production, and the FeO has great correlation with the properties of the sintering ore, such as drum strength, cold strength, low-temperature reduction degradation rate, reducibility and the like, so that the process operation of increasing the yield, reducing the coke and increasing the efficiency in the blast furnace smelting process is influenced; in the HIsmelt and oxygen top-blown smelting reduction iron-making process and the steel-making process, the content of FeO in the slag directly influences the dissolution speed of lime, the speed of slag melting, the quality of dephosphorization effect, the splashing and drying of slag, iron consumption and the degree of erosion to a furnace lining; the research on the FeO content in the slag is of great significance.
In the prior art, FeO required by slag is prepared by heating ferrous oxalate under the condition of air isolation; and secondly, reducing the ferric oxide by controlling a proper reducing atmosphere. However, FeO prepared by the existing method is unstable and is decomposed into iron and Fe under the condition of lower than 575 DEG C3O4Therefore, it is necessary to introduce the slag containing FeO into the process of preparing the slagProtecting with inert gas to prevent FeO from being oxidized; in addition, in the market, the price of the pure chemical reagent of FeO is expensive, the average price is 1900-2900 Yuan/Kg, and the pure chemical reagent is not easy to store, thereby bringing great inconvenience to research on the influence of FeO on the performance of the slag by using the pure chemical reagent to prepare the slag.
Disclosure of Invention
In order to solve the problem of instability of FeO prepared by the prior art, the invention provides a preparation process of FeO in metallurgical slag.
The technical scheme of the invention is as follows:
a process for preparing FeO from metallurgical molten slag includes such steps as preparing reduced iron powder and Fe2O3And SiO2Mixing according to a certain molar ratio, fully grinding and uniformly mixing to obtain a mixed material, adding carbon powder into the mixed material according to the molar ratio of the carbon powder to the reduced iron powder to obtain a reaction system, heating the reaction system to 1100-1500 ℃ at a certain heating rate, and keeping the temperature for a certain time to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing and drying the product to obtain the slag ingredient containing stable FeO.
Further, the adding mode of the carbon powder is to cover the carbon powder on the surface of the mixed material.
Further, the adding mode of the carbon powder is to uniformly mix the mixed material and the carbon powder.
Further, the adding mode of the carbon powder is that the mixed material and the carbon powder are uniformly mixed and then the carbon powder is paved on the surface of the mixed material.
Further, the reduced iron powder, Fe2O3And SiO2In a molar ratio of 1:1: 1.5.
Further, the molar ratio of the carbon powder to the reduced iron powder is 1-4: 1.
Further, the carbon powder is charcoal powder or coke powder with the granularity of 100-300 meshes.
Further, the heating rate is 5 ℃/min, and the heat preservation time is 30 min.
Further, the heating temperature is 1100 ℃, 1200 ℃, 1300 ℃, 1400 ℃ or 1500 ℃.
Further, the particle size of the slag burden containing stable FeO is 100-300 meshes.
The invention has the beneficial effects that:
the invention provides a preparation process of FeO in metallurgical slag, which adopts reduced iron powder and analytically pure Fe2O3By chemical reaction at high temperature and with SiO2The slag burden containing stable FeO is obtained in a fixed mode, and FeO can be prevented from being oxidized into trivalent iron oxide in air, so that the generation of a large amount of non-FeO iron oxide in the slag is avoided.
The preparation method has the advantages of short process flow, simple operation, no need of introducing inert gas in the preparation process, and the used reduced iron powder and analytically pure Fe2O3Low price and low cost. The high temperature of 1100-1500 ℃ is adopted for melting, the components are uniform, the components close to the actual metallurgical slag can be formed, the prepared FeO is 70-95% of the theoretical design calculated value, and the requirement of the required FeO in the metallurgical slag is met.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Example 1
A process for preparing FeO from metallurgical molten slag includes such steps as preparing reduced iron powder and Fe2O3And SiO2Mixing according to a certain molar ratio, fully grinding and uniformly mixing to obtain a mixed material, adding carbon powder into the mixed material according to the molar ratio of the carbon powder to the reduced iron powder to obtain a reaction system, heating the reaction system to 1100-1500 ℃ at a certain heating rate, and keeping the temperature for a certain time to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing and drying the product to obtain the slag ingredient containing stable FeO.
Example 2
Preparation tool of FeO in metallurgical slagThe process comprises the steps of reducing iron powder and Fe2O3And SiO2Mixing the raw materials according to a molar ratio of 1:1:1.5, fully grinding and uniformly mixing the raw materials to obtain a mixed material, adding carbon powder into the mixed material according to a molar ratio of 1-4: 1 of the carbon powder to the reduced iron powder to obtain a reaction system, heating the reaction system to 1100-1500 ℃ at a heating rate of 5 ℃/min, and keeping the temperature for a certain time to generate stable FeO-SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing and drying the product to obtain the slag ingredient containing stable FeO.
This example is in MoSi without any protective gas2In the furnace, the slag is prepared by using pure chemical reagents. In the embodiment, charcoal powder is laid on the surface of the mixture, or the mixture is fully mixed with the carbon powder, or the mixture is uniformly mixed with the carbon powder and then the carbon powder is laid on the surface of the mixture, and the added carbon powder can isolate oxygen in a high-temperature reaction, prevent a reaction product from being oxidized, and further promote reduced iron powder and Fe2O3The reaction of (1).
Example 3
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, covering 0.6675g of charcoal powder with the particle size of 100-300 meshes on the surface of the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1100 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 4
This example provides a process for preparing FeO in metallurgical slag, which comprises:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, and covering 1.3350g of the mixed material on the surface of the mixed material, wherein the particle size of the mixed material is 100-300 meshesThe charcoal powder is prepared by placing the reaction system in a resistance furnace, heating the reaction system to 1200 ℃ at a heating rate of 5 ℃/min, and keeping the temperature for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 5
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, covering 2.0025g of charcoal powder with the particle size of 100-300 meshes on the surface of the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1300 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 6
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, paving 2.67g of charcoal powder with the particle size of 100-300 meshes on the surface of the mixed material, placing a reaction system into a resistance furnace, heating the reaction system to 1400 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 7
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, grinding with agate mortar to obtain mixture, loading into corundum crucible, and mixing0.6675g of charcoal powder with the grain diameter of 100-300 meshes is mixed, the reaction system is placed in a resistance furnace, the reaction system is heated to 1100 ℃ at the heating rate of 5 ℃/min and is kept warm for 30min, and stable FeO & SiO is generated2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 8
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, uniformly mixing 1.335g of charcoal powder with the particle size of 100-300 meshes in the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1200 ℃ at the heating rate of 5 ℃/min, and keeping the temperature for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 9
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, uniformly mixing 2.0025g of charcoal powder with the particle size of 100-300 meshes in the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1300 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 10
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, grinding with agate mortar to obtain mixture, and loading the mixture into corundum crucibleIn the crucible, 2.67g of charcoal powder with the particle size of 100-300 meshes is uniformly mixed in the mixture material, the reaction system is placed in a resistance furnace, the reaction system is heated to 1500 ℃ at the heating rate of 5 ℃/min and is kept warm for 30min, and stable FeO & SiO is generated2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 11
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, evenly dividing 0.6675g of charcoal powder with the particle size of 100-300 meshes into two parts, uniformly mixing one part of charcoal powder with the mixed material, paving the rest part on the surface of the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1200 ℃ at the heating rate of 5 ℃/min, and preserving the temperature for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 12
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, evenly dividing 1.335g of charcoal powder with the particle size of 100-300 meshes into two parts, uniformly mixing one part of charcoal powder with the mixed material, covering the rest part on the surface of the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1300 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 13
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, evenly dividing 2.0025g of charcoal powder with the particle size of 100-300 meshes into two parts, uniformly mixing one part of charcoal powder with the mixed material, paving the rest part on the surface of the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1400 ℃ at the heating rate of 5 ℃/min, and preserving the temperature for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 14
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, evenly dividing 2.67g of charcoal powder with the particle size of 100-300 meshes into two parts, uniformly mixing one part of charcoal powder with the mixed material, covering the rest part on the surface of the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1500 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 15
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, covering 0.6675g of coke powder with the particle size of 100-300 meshes on the surface of the mixed material, placing a reaction system into a resistance furnace, heating the reaction system to 1200 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2Crushing the product to 200 meshes and drying to obtain the productSlag burden containing stable FeO.
Example 16
This example provides a process for preparing FeO in metallurgical slag, which comprises:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, covering 1.3350g of coke powder with the particle size of 100-300 meshes on the surface of the mixed material, placing a reaction system into a resistance furnace, heating the reaction system to 1300 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 17
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, covering 2.0025g of coke powder with the particle size of 100-300 meshes on the surface of the mixed material, placing a reaction system into a resistance furnace, heating the reaction system to 1400 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 18
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, paving 2.67g of coke powder with the particle size of 100-300 meshes on the surface of the mixed material, placing a reaction system into a resistance furnace, heating the reaction system to 1100 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2Product ofCrushing to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 19
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, uniformly mixing 0.6675g of coke powder with the particle size of 100-300 meshes in the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1200 ℃ at the heating rate of 5 ℃/min, and keeping the temperature for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 20
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, uniformly mixing 1.335g of coke powder with the particle size of 100-300 meshes in the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1300 ℃ at the heating rate of 5 ℃/min, and keeping the temperature for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 21
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, uniformly mixing 2.0025g of coke powder with the particle size of 100-300 meshes in the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1400 ℃ at the heating rate of 5 ℃/min, and keeping the temperature for 30min to generate stable FeO & SiO2Product, furnace coolingCooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 22
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, uniformly mixing 2.67g of coke powder with the particle size of 100-300 meshes in the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1500 ℃ at the heating rate of 5 ℃/min, and keeping the temperature for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 23
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, evenly dividing 0.6675g of coke powder with the particle size of 100-300 meshes into two parts, uniformly mixing one part of coke powder with the mixed material, paving the rest part on the surface of the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1200 ℃ at the heating rate of 5 ℃/min, and preserving the temperature for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 24
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, evenly dividing 1.335g of coke powder with the particle size of 100-300 meshes into two parts, evenly mixing one part of coke powder with the mixed material, and evenly mixing the rest part of coke powderSpreading on the surface of the mixture, placing the reaction system in a resistance furnace, heating the reaction system to 1300 ℃ at a heating rate of 5 ℃/min, and keeping the temperature for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 25
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, evenly dividing 2.0025g of coke powder with the particle size of 100-300 meshes into two parts, uniformly mixing one part of coke powder with the mixed material, paving the rest part on the surface of the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1400 ℃ at the heating rate of 5 ℃/min, and preserving the temperature for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Example 26
The embodiment provides a preparation process of FeO in metallurgical slag, which comprises the following steps:
3.1g of reduced iron powder, 8.9g of Fe2O3And 4.98gSiO2Mixing, fully grinding and uniformly mixing by using an agate mortar to obtain a mixed material, putting the mixed material into a corundum crucible, evenly dividing 2.67g of coke powder with the particle size of 100-300 meshes into two parts, uniformly mixing one part of coke powder with the mixed material, covering the rest part on the surface of the mixed material, placing a reaction system in a resistance furnace, heating the reaction system to 1500 ℃ at the heating rate of 5 ℃/min, and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing the product to 200 meshes, and drying to obtain the slag ingredient containing stable FeO.
Using the slag batches prepared in examples 3 to 26, 100g of slag containing 12 wt% FeO was prepared, the actual content of FeO in the obtained slag was measured, and the mass concentrations of FeO actually contained in the slag calculated were as shown in Table 1:
TABLE 1
As can be seen from the data in Table 1, the reagent content of FeO in the prepared slag is 70-95% of the theoretical design value, the requirement of preparing FeO in metallurgical slag is met, and compared with the prior art, the method has the advantages of short flow, simplicity in operation and low cost.
The data in table 1 show that different blending modes of the carbon powder and the mixed material have different effects on the preparation of FeO, and the carbon powder is covered on the surface of the mixed material to isolate oxygen, prevent reaction products from being oxidized and promote reduced iron powder and Fe2O3The reaction of (1); the mixed material and the carbon powder are fully mixed to ensure that the mixed material and the carbon powder are contacted more closely, so that the reaction promoting effect of the carbon powder is further improved; the mode of uniformly mixing the mixed material and the carbon powder and then paving the carbon powder on the surface of the mixed material not only promotes the reaction, but also improves the effect of isolating oxygen, so that the FeO content prepared by the mode of uniformly mixing and then paving is higher.
Claims (4)
1. A process for preparing FeO from metallurgical molten slag includes such steps as mixing reduced iron powder with Fe2O3And SiO2Mixing the raw materials according to a molar ratio of 1:1:1.5, fully grinding and uniformly mixing the raw materials to obtain a mixed material, adding carbon powder into the mixed material according to a molar ratio of 1-4: 1 of the carbon powder to reduced iron powder to obtain a reaction system, wherein the carbon powder is added in a mode of covering the surface of the mixed material with the carbon powder, or uniformly mixing the mixed material with the carbon powder, or covering the surface of the mixed material with the carbon powder after uniformly mixing the mixed material with the carbon powder; heating the reaction system to 1100-1500 ℃ at a heating rate of 5 ℃/min and preserving heat for 30min to generate stable FeO & SiO2Cooling the product along with the furnace, and then cooling the FeO SiO2And crushing and drying the product to obtain the slag ingredient containing stable FeO.
2. The process for preparing FeO in metallurgical slag according to claim 1, wherein the carbon powder is charcoal powder or coke powder with a particle size of 100-300 meshes.
3. A process according to claim 2, wherein the heating temperature is 1100 ℃, 1200 ℃, 1300 ℃, 1400 ℃ or 1500 ℃.
4. The process according to claim 3, wherein the slag burden containing stable FeO has a particle size of 100-300 mesh.
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