Chromium-containing acidic sintered ore, preparation method thereof and use thereof

Abstract

The present invention relates to a chromium-containing acidic sintered ore, a preparation method thereof, and uses thereof. The chromium-containing acidic sintered ore comprises, by weight percentage, 5.5-6% silicon dioxide, 1.2-1.4% magnesium oxide, 3.2-3.7% calcium oxide, 2.5-3.2% aluminum oxide, 1.5-1.8% titanium dioxide, 0.55-0.63% manganese oxide, 0.3-0.5% chromium trioxide, 0.25-0.3% vanadium pentoxide, ≤0.11% phosphorus, and 57-60% TFe. The chromium-containing acidic sintered ore provided by the present invention can significantly reduce the viscosity of slag during blast furnace smelting by designing the composition of the sintered ore when the sintered ore replaces part of the pellets, thereby facilitating smooth blast furnace smelting.

Description

Technical Field

[0001] The present invention relates to the field of blast furnace smelting, and in particular to a chromium-containing acidic sintered ore and a preparation method and application thereof. Background Art

[0002] At present, in the blast furnace production process, different proportions of acidic pellets and alkaline sintered ore are needed to control the index parameters of molten iron.

[0003] For example, CN115535643A discloses a blast furnace smelting production system, which includes a blast furnace body, a material transport unit, a blowing unit, and a feeding unit. The material transport unit includes a bracket, a drive motor, a conveyor belt, and two feeding trolleys. The bracket is connected between the blast furnace body and the feeding unit, and the bracket is provided with two parallel slide rails; the drive motor is provided on the bracket; the conveyor belt is connected to the output shaft of the drive motor, the supporting surface of the conveyor belt is parallel to the output shaft of the drive motor, and the opposite sides of the conveyor belt are respectively provided with connecting shafts, the axial direction of the connecting shaft is perpendicular to the supporting surface of the conveyor belt; two feeding trolleys are rotatably connected to the connecting shaft, and the feeding trolleys are provided in a one-to-one correspondence with the slide rails and slide in cooperation. The blast furnace smelting production system provided by this solution increases the frequency of material addition, reduces the waiting time for feeding the blast furnace, and improves production efficiency.

[0004] CN107475471A discloses a blast furnace smelting method, comprising the following steps: preparing sintered ore, comprising the following components: 45%-55% vanadium-titanium magnetite concentrate, 45%-55% ordinary iron ore, and 20% fuel and flux; and finally adding 0.01%-0.02% urea solution to the sintered ore, based on the total mass of the sintered ore; preparing pelletized ore, comprising mixing vanadium-titanium magnetite with different titanium and iron contents as raw materials, adding 1-2.5% bentonite by weight of the total raw materials, and further mixing the mixture to form pellets; mixing the sintered ore with the pelletized ore; and step 2: introducing the prepared blast furnace charge into the blast furnace, preheating the blast furnace, and then firing the furnace to generate high-temperature hot air. After mixing limestone flux powder with the high-temperature hot air, the mixture is sprayed into the blast furnace hearth through the tuyere. This method allows the raw materials to react fully, can maximize the output of iron, makes full use of resources, effectively increases the vanadium content of molten iron, and reduces production costs.

[0005] However, the acidic charge used in today's blast furnace process still has the problem of high slag viscosity during the smelting process. Summary of the Invention

[0006] In view of the problems existing in the prior art, the object of the present invention is to provide a chromium-containing acidic sintered ore and its preparation method and use, so as to solve the problem of high slag viscosity after the sintered ore is mixed during the blast furnace smelting process.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a chromium-containing acidic sintered ore, which comprises, by mass percentage, 5.5-6% silicon dioxide, 1.2-1.4% magnesium oxide, 3.2-3.7% calcium oxide, 2.5-3.2% aluminum oxide, 1.5-1.8% titanium dioxide, 0.55-0.63% manganese oxide, 0.3-0.5% chromium trioxide, 0.25-0.3% vanadium pentoxide, ≤0.11% phosphorus, and 57-60% TFe.

[0009] The chromium-containing acidic sintered ore provided by the present invention can significantly reduce the viscosity of the slag during smelting by designing the composition of the sintered ore when it replaces part of the pellets and is smelted in a blast furnace, which is beneficial to the smooth progress of blast furnace smelting.

[0010] In the present invention, the silicon dioxide content in the chromium-containing acidic sintered ore is 5.5-6% by mass, for example, 5.5%, 5.55%, 5.6%, 5.65%, 5.7%, 5.75%, 5.8%, 5.85%, 5.9%, 5.95% or 6%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0011] In the present invention, the magnesium oxide content in the chromium-containing acidic sintered ore is 1.2-1.4% by mass, for example, 1.2%, 1.21%, 1.22%, 1.23%, 1.24%, 1.25%, 1.26%, 1.27%, 1.28%, 1.29%, 1.3%, 1.31%, 1.32%, 1.33%, 1.34%, 1.35%, 1.36%, 1.37%, 1.38%, 1.39% or 1.4%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0012] In the present invention, the calcium oxide content in the chromium-containing acidic sintered ore is 3.2-3.7% by mass, for example, 3.2%, 3.22%, 3.24%, 3.26%, 3.28%, 3.3%, 3.32%, 3.34%, 3.36%, 3.38%, 3.4%, 3.42%, 3.44%, 3.46%, 3.48%, 3.5%, 3.52%, 3.54%, 3.56%, 3.58%, 3.6%, 3.62%, 3.64%, 3.66%, 3.68% or 3.7%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0013] In the present invention, the aluminum oxide content in the chromium-containing acidic sintered ore is 2.5-3.5% by mass, for example, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4% or 3.5%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0014] In the present invention, the mass percentage of titanium dioxide in the chromium-containing acidic sintered ore is 1.5-1.8%, for example, it can be 1.5%, 1.52%, 1.54%, 1.56%, 1.58%, 1.6%, 1.62%, 1.64%, 1.66%, 1.68%, 1.7%, 1.72%, 1.74%, 1.76%, 1.78% or 1.8%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0015] In the present invention, the manganese oxide content in the chromium-containing acidic sintered ore is 0.55-0.63% by mass, for example, 0.55%, 0.555%, 0.56%, 0.565%, 0.57%, 0.575%, 0.58%, 0.585%, 0.59%, 0.595%, 0.6%, 0.605%, 0.61%, 0.615%, 0.62%, 0.625% or 0.63%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0016] In the present invention, the chromium trioxide content in the chromium-containing acidic sintered ore is 0.3-0.5% by mass, for example, it can be 0.3%, 0.31%, 0.32%, 0.33%, 0.34%, 0.35%, 0.36%, 0.37%, 0.38%, 0.39%, 0.4%, 0.41%, 0.42%, 0.43%, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%, 0.49% or 0.5%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0017] In the present invention, the vanadium pentoxide content in the chromium-containing acidic sintered ore is 5.5-6% by mass, for example, 5.5%, 5.55%, 5.6%, 5.65%, 5.7%, 5.75%, 5.8%, 5.85%, 5.9%, 5.95% or 6%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0018] In the present invention, the phosphorus content in the chromium-containing acidic sintered ore is ≤0.11% by mass, for example, it can be 0.11%, 0.1%, 0.09%, 0.08%, 0.07%, 0.06%, 0.05%, 0.04%, 0.03%, 0.02% or 0.01%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0019] In the present invention, the TFe content in the chromium-containing acidic sintered ore is 57-60% by mass, for example, 57%, 57.2%, 57.4%, 57.6%, 57.8%, 58%, 58.2%, 58.4%, 58.6%, 58.8%, 59%, 59.2%, 59.4%, 59.6%, 59.8% or 60%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0020] As a preferred technical solution of the present invention, the basicity of the chromium-containing acidic sintered ore is 0.53-0.68, for example, it can be 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67 or 0.68, but is not limited to the listed values. Other values ​​not listed within this range are also applicable.

[0021] In the present invention, basicity refers to the mass ratio of calcium oxide to silicon oxide.

[0022] Preferably, the drum index of the chromium-containing acidic sintered ore is 71-75%, for example, it can be 71%, 71.2%, 71.4%, 71.6%, 71.8%, 72%, 72.2%, 72.4%, 72.6%, 72.8%, 73%, 73.2%, 73.4%, 73.6%, 73.8%, 74%, 74.2%, 74.4%, 74.6%, 74.8% or 75%, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0023] Preferably, the reduction pulverization index of the chromium-containing acidic sintered ore is 47-54%; for example, it can be 47%, 47.5%, 48%, 48.5%, 49%, 49.5%, 50%, 50.5%, 51%, 51.5%, 52%, 52.5%, 53%, 53.5% or 54%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0024] Preferably, the mass percentage of particles with a particle size of 5-10 mm in the chromium-containing acidic sintered ore is 25-28% of the total particles, for example, it can be 25%, 25.2%, 25.4%, 25.6%, 25.8%, 26%, 26.2%, 26.4%, 26.6%, 26.8%, 27%, 27.2%, 27.4%, 27.6%, 27.8% or 28%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0025] In a second aspect, the present invention provides a method for preparing the chromium-containing acidic sintered ore as described in the first aspect, the preparation method comprising:

[0026] According to the formula, vanadium-titanium magnetite, vanadium extraction tailings, cold return ore, external ore powder, flux and fuel are batched, mixed and granulated, and then sintered, cooled and screened in sequence to obtain chromium-containing acidic sintered ore.

[0027] In the present invention, the vanadium-titanium magnetite can be the vanadium-titanium magnetite commonly used in the art, such as the vanadium-titanium magnetite from Chenggang or the vanadium-titanium magnetite from Panzhihua, etc., and its amount can be configured according to the elements in the above formula.

[0028] In the present invention, the vanadium extraction tailings can be tailings obtained by hydrometallurgical treatment of vanadium slag obtained after vanadium extraction in a converter, and the amount thereof can be configured according to the element requirements of the sintered ore.

[0029] In the present invention, the cold return ore can be the cooled acidic sintered ore, such as the sintered ore in this application, or other acidic sintered ores in the art, and the dosage can be configured according to the element requirements of the sintered ore.

[0030] In the present invention, the external mineral powder can be Jinbuba powder, Brazil card powder, FMG mixed powder and other external mineral powders commonly used in the art.

[0031] In the present invention, the flux may be quicklime powder and / or limestone powder or other commonly used fluxes in the art.

[0032] For example, the mass percentage of vanadium-titanium magnetite powder in the material obtained by batching can be 24-25%, the mass percentage of external ore powder can be 44-46%, the mass percentage of vanadium extraction tailings can be 3-5%, and the mass percentage of cold return ore can be 18-22%. It is sufficient to ensure that the sum of vanadium-titanium magnetite, vanadium extraction tailings, cold return ore, external ore powder, flux and fuel in the powder is 100%.

[0033] As a preferred technical solution of the present invention, the amount of the flux added is 0.5-1% of the mass of the material obtained by batching, for example, it can be 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95% or 1%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0034] Preferably, the amount of fuel added is 5.2-6% of the mass of the material obtained by batching, for example, it can be 5.2%, 5.25%, 5.3%, 5.35%, 5.4%, 5.45%, 5.5%, 5.55%, 5.6%, 5.65%, 5.7%, 5.75%, 5.8%, 5.85%, 5.9%, 5.95% or 6%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0035] As a preferred technical solution of the present invention, the moisture content of the material obtained by the ingredients is 7.3-7.7% by mass, for example, it can be 7.3%, 7.32%, 7.34%, 7.36%, 7.38%, 7.4%, 7.42%, 7.44%, 7.46%, 7.48%, 7.5%, 7.52%, 7.54%, 7.56%, 7.58%, 7.6%, 7.62%, 7.64%, 7.66%, 7.68% or 7.7%, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0036] As a preferred technical solution of the present invention, the sintering machine trolley speed during the sintering is 0.7-1.2 m / min, for example, it can be 0.7 m / min, 0.75 m / min, 0.8 m / min, 0.85 m / min, 0.9 m / min, 0.95 m / min, 1 m / min, 1.05 m / min, 1.1 m / min, 1.15 m / min or 1.2 m / min, but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0037] Preferably, the thickness of the sintering material layer is 600-800 mm, for example, it can be 600 mm, 610 mm, 620 mm, 630 mm, 640 mm, 650 mm, 660 mm, 670 mm, 680 mm, 690 mm, 700 mm, 710 mm, 720 mm, 730 mm, 740 mm, 750 mm, 760 mm, 770 mm, 780 mm, 790 mm or 800 mm, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0038] Preferably, the main pipe temperature of the sintering machine trolley during the sintering is 130-140°C, for example, it can be 130°C, 131°C, 132°C, 133°C, 134°C, 135°C, 136°C, 137°C, 138°C, 139°C, or 140°C, but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0039] Preferably, the endpoint temperature of the sintering is 350-370°C, for example, it can be 350°C, 351°C, 352°C, 353°C, 354°C, 355°C, 356°C, 357°C, 358°C, 359°C, 360°C, 361°C, 362°C, 363°C, 364°C, 365°C, 366°C, 367°C, 368°C, 369°C or 370°C, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0040] As a preferred technical solution of the present invention, the preparation method comprises:

[0041] According to the formula, vanadium-titanium magnetite, vanadium extraction tailings, cold return ore, external ore powder, flux and fuel are batched, mixed and granulated, and then sintered, cooled and screened in sequence to obtain chromium-containing acidic sintered ore;

[0042] The amount of flux added is 0.5-1% of the mass of the material obtained by batching; the amount of fuel added is 5.2-6% of the mass of the material obtained by batching; the moisture content of the material obtained by batching is 7.3-7.7% by mass; the speed of the sintering machine trolley during sintering is 0.7-1.2 m / min; the thickness of the material layer during sintering is 600-800 mm; the main pipe temperature of the sintering machine trolley during sintering is 130-140° C.; and the terminal temperature of sintering is 350-370° C.

[0043] In a third aspect, the present invention provides a use of the chromium-containing acidic sintered ore as described in the first aspect, wherein the use comprises using the chromium-containing acidic sintered ore as a blast furnace charge for blast furnace smelting.

[0044] In the present invention, comprehensive consideration is given to reducing molten iron costs, stabilizing the vanadium content in molten iron, and rationally optimizing the charge structure during blast furnace smelting to produce chromium-containing vanadium-titanium acidic sintered ore that meets the requirements of the blast furnace process. The blast furnace process charges and gradually increases the charge amount. The subsequent process provides feedback on the changes in molten iron composition and vanadium extraction during the charge feeding period. The system is cyclically feedback-optimized, ultimately achieving the effects of stable blast furnace charge structure, stable molten iron quality, and cost reduction and efficiency improvement.

[0045] As a preferred technical solution of the present invention, the mass percentage of the chromium-containing acidic sintered ore in the blast furnace charge is 5-10%, for example, it can be 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5% or 10%, etc., but is not limited to the listed values. Other values ​​not listed within this range are also applicable.

[0046] Preferably, the blast furnace charge includes basic sintered ore, pellets, purchased balls and acidic sintered ore.

[0047] In the present invention, the acidic sintered ore used in the blast furnace charge is the acidic sintered ore provided by the first aspect of the present invention.

[0048] In the present invention, the basis for the proportion of basic sintered ore, pellets, purchased balls and acidic sintered ore in the blast furnace charge is to control the basicity of blast furnace slag within a reasonable range, that is, the basicity of blast furnace slag required for blast furnace smelting determines the proportion of blast furnace charge. In the present invention, by designing the acidic sintered ore, the viscosity of blast furnace slag is reduced without affecting the basicity of blast furnace slag, which is beneficial to the progress of blast furnace smelting.

[0049] In the present invention, the alkaline sintered ore, pellets, and purchased balls can be commercially available products or self-produced products. Specifically, the alkaline sintered ore and pellets used in the present invention are self-produced products, and the purchased balls are commercially available products, such as the purchased balls sold by Chengde Chuangyuan Technology Development Co., Ltd. or the purchased balls sold by Chengde Xintong Shoucheng Technology Co., Ltd.

[0050] As a preferred technical solution of the present invention, the air temperature in the blast furnace smelting is 1100-1300°C, for example, it can be 1100°C, 1110°C, 1120°C, 1130°C, 1140°C, 1150°C, 1160°C, 1170°C, 1180°C, 1190°C, 1200°C, 1210°C, 1220°C, 1230°C, 1240°C, 1250°C, 1260°C, 1270°C, 1280°C, 1290°C or 1300°C, etc., but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0051] Preferably, the air flow rate in the blast furnace is 3200-3300m 3 / min, for example, it can be 3200m 3 / min、3210m 3 / min、3220m 3 / min、3230m 3 / min、3240m 3 / min、3250m 3 / min、3260m 3 / min、3270m 3 / min、3280m 3 / min、3290m 3 / min or 3300m 3 / min, etc., but not limited to the listed values, other values ​​not listed within the range are also applicable.

[0052] Preferably, the blast furnace pressure difference in the blast furnace smelting is ≤185kPa, for example, it can be 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa, 185kPa,

[0053] Preferably, the oxygen enrichment rate in the blast furnace smelting is 4-4.5%, for example, it can be 4%, 4.05%, 4.1%, 4.15%, 4.2%, 4.25%, 4.3%, 4.35%, 4.4%, 4.45% or 4.5%, etc., but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0054] Preferably, the furnace temperature in the blast furnace smelting is 0.3-0.5, for example, it can be 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49 or 0.5, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0055] Preferably, the basicity of the slag in the blast furnace smelting is 1.08-1.18, for example, it can be 1.08, 1.09, 1.1, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17 or 1.18, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0056] Compared with the existing technical solutions, the present invention has the following beneficial effects:

[0057] The chromium-containing acidic sintered ore provided by the present invention improves the performance of the chromium-containing sintered ore by designing the constituent elements and utilizing the synergistic effect between the components, thereby reducing the viscosity of the slag during the blast furnace smelting process to below 0.3 Pa·s. DETAILED DESCRIPTION

[0058] To better illustrate the present invention and facilitate understanding of the technical solutions of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0059] Example 1

[0060] This embodiment provides a chromium-containing acidic sintered ore, which comprises, by mass percentage, 5.9% silicon dioxide, 1.31% magnesium oxide, 3.48% calcium oxide, 2.99% aluminum oxide, 1.73% titanium dioxide, 0.59% manganese oxide, 0.41% chromium trioxide, 0.27% vanadium pentoxide, 0.11% phosphorus, and 58.98% TFe.

[0061] The specific preparation process is as follows:

[0062] According to the formula, vanadium-titanium magnetite, vanadium extraction tailings, cold return ore, external ore powder, flux and fuel are batched, mixed and granulated, and then sintered, cooled and screened in sequence to obtain chromium-containing acidic sintered ore;

[0063] Among them, the amount of flux added is 1% of the mass of the material obtained by batching; the amount of fuel added is 5.2% of the mass of the material obtained by batching; the moisture content of the material obtained by batching is 7.5% in terms of mass percentage; the speed of the sintering machine trolley during sintering is 1 m / min; the thickness of the material layer during sintering is 700 mm; the main pipe temperature of the sintering machine trolley during sintering is 135°C; and the terminal temperature of sintering is 360°C.

[0064] The mass percentage of particles in the chromium-containing acidic sintered ore with a particle size of 5-10 mm accounts for 26% of the total particles.

[0065] Among the ingredients, the material ratio of the obtained powder is calculated by mass percentage: 24.8% of vanadium-titanium magnetite powder, 45.0% of external ore powder, 4.0% of vanadium extraction tailings, 20% of cold return ore, 1.0% of flux, and 5.2% of fuel.

[0066] The performance indicators of the obtained chromium-containing acidic sintered ore are shown in Table 1.

[0067] Example 2

[0068] This embodiment provides a chromium-containing acidic sintered ore, which includes, by mass percentage, 5.5% silicon dioxide, 1.4% magnesium oxide, 3.2% calcium oxide, 2.5% aluminum oxide, 1.8% titanium dioxide, 0.55% manganese oxide, 0.5% chromium trioxide, 0.25% vanadium pentoxide, 0.05% phosphorus, and 57% TFe.

[0069] The specific preparation process is as follows:

[0070] According to the formula, vanadium-titanium magnetite, vanadium extraction tailings, cold return ore, external ore powder, flux and fuel are batched, mixed and granulated, and then sintered, cooled and screened in sequence to obtain chromium-containing acidic sintered ore;

[0071] Among them, the amount of flux added is 0.5% of the mass of the material obtained by batching; the amount of fuel added is 6% of the mass of the material obtained by batching; the moisture content of the material obtained by batching is 7.7% in terms of mass percentage; the speed of the sintering machine trolley during sintering is 0.7 m / min; the thickness of the material layer during sintering is 800 mm; the main pipe temperature of the sintering machine trolley during sintering is 140°C; and the terminal temperature of sintering is 350°C.

[0072] The mass percentage of particles in the chromium-containing acidic sintered ore with a particle size of 5-10 mm accounts for 28% of the total particles.

[0073] The material ratio of the obtained powder is calculated by weight percentage as follows: 24% vanadium-titanium magnetite powder, 46% external ore powder, 5% vanadium extraction tailings, 18.5% cold return ore, 0.5% flux, and 6% fuel.

[0074] The performance indicators of the obtained chromium-containing acidic sintered ore are shown in Table 1.

[0075] Example 3

[0076] This embodiment provides a chromium-containing acidic sintered ore, which includes, by mass percentage, 6% silicon dioxide, 1.2% magnesium oxide, 3.7% calcium oxide, 3.2% aluminum oxide, 1.5% titanium dioxide, 0.63% manganese oxide, 0.3% chromium trioxide, 0.3% vanadium pentoxide, 0.01% phosphorus, and 60% TFe.

[0077] The specific preparation process is as follows:

[0078] According to the formula, vanadium-titanium magnetite, vanadium extraction tailings, cold return ore, external ore powder, flux and fuel are batched, mixed and granulated, and then sintered, cooled and screened in sequence to obtain chromium-containing acidic sintered ore;

[0079] Among them, the amount of flux added is 1% of the mass of the material obtained by batching; the amount of fuel added is 5.2% of the mass of the material obtained by batching; the moisture content of the material obtained by batching is 7.3% in terms of mass percentage; the speed of the sintering machine trolley during sintering is 1.2 m / min; the thickness of the material layer during sintering is 600 mm; the main pipe temperature of the sintering machine trolley during sintering is 130°C; and the terminal temperature of sintering is 370°C.

[0080] The mass percentage of particles in the chromium-containing acidic sintered ore with a particle size of 5-10 mm accounts for 25% of the total particles.

[0081] The material ratio of the obtained powder is calculated by weight percentage as follows: 25% vanadium-titanium magnetite powder, 44% external ore powder, 3% vanadium extraction tailings, 21.8% cold return ore, 1% flux, and 5.2% fuel.

[0082] The performance indicators of the obtained chromium-containing acidic sintered ore are shown in Table 1.

[0083] In the above embodiment, the composition of the vanadium-titanium magnetite used is TFe 63.76%, CaO 1.48%, MgO 1.28%, SiO2 3.90%, Al2O3 1.25%, TiO2 2.62%, V2O5 0.483%, P 0.031%, Cr2O3 0.093%, and moisture 8.93% in terms of mass percentage; the composition of the vanadium extraction tailings is TFe 38.68%, CaO 2.24%, MgO 1.5%, SiO2 14.38%, Al2O3 1.55%, TiO2 10.61%, V2O5 1%, P 0.095%, Cr2O3 6.5%, and moisture 17%; the composition of the cold return ore is TFe 58.86%, CaO 3.54%, MgO 1.87%, SiO2 6.03%, Al2O3 The external mineral powders are commercially available FMG mixed powder (composition: TFe 58.19%, MgO 0.07%, SiO2 5.89%, Al2O3 2.64%, V2O5 0.01%, P 0.083%, moisture 8.11%) and Jinbuba powder (composition: TFe 60.19%, SiO2 4.86%, Al2O3 3.26%, P 0.116%, moisture 7.32%); the solvent is commercially available quicklime powder; and the fuel is commercially available anthracite.

[0084] Application Example 1

[0085] This embodiment provides a blast furnace smelting process, specifically using the chromium-containing acidic sintered ore in Example 1, as follows:

[0086] The charge ratio of chromium-containing vanadium-titanium acidic sinter during the feeding period is as follows:

[0087] Basic sintered ore Self-produced pellets Purchased balls Acidic sinter Ratio of serving size (%) 65 25 5 5

[0088] The wind temperature in the blast furnace smelting is 1200°C; the wind flow rate in the blast furnace smelting is 3250m 3 / min; the blast furnace pressure difference during the blast furnace smelting is 185kPa; the oxygen enrichment rate during the blast furnace smelting is 4.2%; the furnace temperature during the blast furnace smelting is 0.4; the basicity of the slag during the blast furnace smelting is 1.1.

[0089] The viscosity index of slag in blast furnace smelting is detailed in Table 2.

[0090] Application Example 2

[0091] This embodiment provides a blast furnace smelting process, specifically using the chromium-containing acidic sintered ore in Example 2, as follows:

[0092] The charge ratio of chromium-containing vanadium-titanium acidic sinter during the feeding period is as follows:

[0093] Basic sintered ore Self-produced pellets Purchased balls Acidic sinter Ratio of serving (%) 62 20 8 10

[0094] The wind temperature in the blast furnace smelting is 1100°C; the wind flow rate in the blast furnace smelting is 3300m 3 / min; the blast furnace pressure difference during the blast furnace smelting is 145kPa; the oxygen enrichment rate during the blast furnace smelting is 4.5%; the furnace temperature during the blast furnace smelting is 0.3; the basicity of the slag during the blast furnace smelting is 1.18.

[0095] The viscosity index of slag in blast furnace smelting is detailed in Table 2.

[0096] Application Example 3

[0097] This embodiment provides a blast furnace smelting process, specifically using the chromium-containing acidic sintered ore in Example 3, as follows:

[0098] The charge ratio of chromium-containing vanadium-titanium acidic sinter during the feeding period is as follows:

[0099] Basic sintered ore Self-produced pellets Purchased balls Acidic sinter Ratio of serving (%) 62 27 3 8

[0100] The wind temperature in the blast furnace smelting is 1300°C; the wind flow rate in the blast furnace smelting is 3200m 3 / min; the blast furnace pressure difference in the blast furnace smelting is 105kPa; the oxygen enrichment rate in the blast furnace smelting is 4%; the furnace temperature in the blast furnace smelting is 0.5; the basicity of the slag in the blast furnace smelting is 1.08.

[0101] The viscosity index of slag in blast furnace smelting is detailed in Table 2.

[0102] Application Example 4

[0103] The only difference from Application Example 1 is that the chromium-containing acidic sintered ore contains manganese oxide, which is adjusted by adjusting the raw materials used in the preparation process. The changed amount is adjusted with the help of the iron content to ensure that other elements except iron remain unchanged.

[0104] The viscosity index of slag in blast furnace smelting is detailed in Table 2.

[0105] Application Example 5

[0106] The only difference from Application Example 1 is that the calcium oxide content in the chromium-containing acidic sintered ore is 1%, which is specifically adjusted by adjusting the raw materials used in the preparation process. The changed amount is adjusted with the help of the iron content to ensure that other elements except iron remain unchanged.

[0107] The viscosity index of slag in blast furnace smelting is detailed in Table 2.

[0108] Application Example 6

[0109] The only difference from Application Example 1 is that the magnesium oxide content in the chromium-containing acidic sintered ore is 3%, which is specifically adjusted by adjusting the raw materials used in the preparation process. The changed amount is adjusted with the help of the iron content to ensure that other elements except iron remain unchanged.

[0110] The viscosity index of slag in blast furnace smelting is detailed in Table 2.

[0111] Application Example 7

[0112] The only difference from Application Example 1 is that the vanadium pentoxide content in the chromium-containing acidic sintered ore is 1%, which is specifically adjusted by adjusting the raw materials used in the preparation process. The changed amount is adjusted with the help of the iron content to ensure that other elements except iron remain unchanged.

[0113] The viscosity index of slag in blast furnace smelting is detailed in Table 2.

[0114] Application Example 8

[0115] The only difference from Application Example 1 is that the titanium dioxide content in the chromium-containing acidic sintered ore is 10%, which is specifically adjusted by adjusting the raw materials used in the preparation process. The changed amount is adjusted with the help of the iron content to ensure that other elements except iron remain unchanged.

[0116] The viscosity index of slag in blast furnace smelting is detailed in Table 2.

[0117] Application Example 9

[0118] The only difference from Application Example 1 is that the chromium trioxide content in the chromium-containing acidic sintered ore is 0.02%, which is specifically adjusted by adjusting the raw materials used in the preparation process. The changed amount is adjusted with the help of the iron content to ensure that other elements except iron remain unchanged.

[0119] The viscosity index of slag in blast furnace smelting is detailed in Table 2.

[0120] The basic sintered ore used in the above application example is self-produced basic sintered ore, with a specific composition of TFe 54.32%, FeO8.48%, CaO 9.58%, MgO 3.07%, SiO2 5.17%, basicity R2 1.85, drum index +6.3mm is 75.4%, screening index -5mm is 4.5%, particle size (5-10mm) is 24.5%, TiO2 1.79%, Al2O32.10%, P 0.060%, Cr2O3 0.11%, V2O5 0.302%; the composition of the self-produced pellets is TFe 58.74%, FeO 0.95%, CaO 1.03%, MgO 0.86%, SiO2 3.46%, basicity R2 0.3, drum index +6.3mm is 92.3%, sieving index -5mm is 2.2%, particle size (8-16mm) is 88.2%, TiO2 is 6.14%, Al2O3 is 1.85%, P is 0.045%, Cr2O3 is 0.40%, and V2O5 is 0.577%; the purchased balls used are pellets purchased from Chengde Chuangyuan Technology Development Co., Ltd., with a composition of TFe 61.07%, FeO 0.91%, CaO 1.28%, MgO1.38%, SiO2 4.88%, basicity R2 0.26, drum index +6.3mm is 95.84%, sieving index -5mm is 2.212%, particle size (8-16mm) is 85.71%, TiO2 is 2.87%, and V2O5 is 0.424%.

[0121] Table 1

[0122] Drum index / % Reduction powder index / % Example 1 73 50 Example 2 72 47 Example 3 75 52

[0123] Table 2

[0124] Slag viscosity / Ps·s Application Example 1 0.12 Application Example 2 0.30 Application Example 3 0.24 Application Example 4 0.72 Application Example 5 0.96 Application Example 6 1.23 Application Example 7 0.67 Application Example 8 0.99 Application Example 9 1.35

[0125] The results of the above examples show that the chromium-containing acidic sintered ore provided by the present invention can significantly reduce the viscosity of the slag during smelting by designing the composition of the sintered ore when it replaces part of the pellets and is then smelted in a blast furnace, which is beneficial to the smooth progress of blast furnace smelting.

[0126] It should be noted that the present invention uses the above-described embodiments to illustrate the detailed structural features of the present invention. However, the present invention is not limited to these detailed structural features, and this does not mean that the present invention must rely on these detailed structural features to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent replacements for selected components, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

[0127] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0128] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0129] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A chromium-containing acidic sintered ore, characterized in that: The chromium-containing acidic sintered ore comprises, by mass percentage, 5.5-5.9% silicon dioxide, 1.2-1.4% magnesium oxide, 3.2-3.7% calcium oxide, 2.5-3.2% aluminum oxide, 1.54-1.8% titanium dioxide, 0.55-0.63% manganese oxide, 0.3-0.5% chromium trioxide, 0.25-0.3% vanadium pentoxide, ≤0.11% phosphorus, and 57-60% TFe; Wherein, the drum index of the chromium-containing acidic sintered ore is 71-75%; The reduction pulverization index of the chromium-containing acidic sintered ore is 47-54%.

2. The chromium-containing acidic sintered ore according to claim 1, characterized in that: The basicity of the chromium-containing acidic sintered ore is 0.53-0.

68.

3. The chromium-containing acidic sintered ore according to claim 1, characterized in that: The mass percentage of particles with a diameter of 5-10 mm in the chromium-containing acidic sintered ore is 25-28% of the total particles.

4. A method for preparing the chromium-containing acidic sintered ore according to any one of claims 1 to 3, characterized in that: The preparation method comprises: According to the formula, vanadium-titanium magnetite, vanadium extraction tailings, cold return ore, external ore powder, flux and fuel are batched, mixed and granulated, and then sintered, cooled and screened in sequence to obtain chromium-containing acidic sintered ore.

5. The preparation method according to claim 4, wherein: The amount of the flux added is 0.5-1% of the mass of the material obtained by batching.

6. The preparation method according to claim 4, characterized in that: The amount of the fuel added is 5.2-6% of the mass of the material obtained by batching.

7. The preparation method according to claim 4, characterized in that: The moisture content of the material obtained by the batching is 7.3-7.7% by mass.

8. The preparation method according to claim 4, wherein: During the sintering, the trolley speed of the sintering machine is 0.7-1.2 m / min.

9. The preparation method according to claim 4, characterized in that: The thickness of the sintering material layer is 600-800 mm.

10. The preparation method according to claim 4, characterized in that: During the sintering, the main pipe temperature of the sintering machine trolley is 130-140°C.

11. The preparation method according to claim 4, characterized in that: The end point temperature of the sintering is 350-370°C.

12. The preparation method according to claim 4, characterized in that: The preparation method comprises: According to the formula, vanadium-titanium magnetite, vanadium extraction tailings, cold return ore, external ore powder, flux and fuel are batched, mixed and granulated, and then sintered, cooled and screened in sequence to obtain chromium-containing acidic sintered ore; The amount of flux added is 0.5-1% of the mass of the material obtained by batching; the amount of fuel added is 5.2-6% of the mass of the material obtained by batching; the moisture content of the material obtained by batching is 7.3-7.7% by mass; the speed of the sintering machine trolley during sintering is 0.7-1.2 m / min; the thickness of the material layer during sintering is 600-800 mm; the main pipe temperature of the sintering machine trolley during sintering is 130-140° C.; and the terminal temperature of sintering is 350-370° C.

13. Use of the chromium-containing acidic sintered ore according to any one of claims 1 to 3, characterized in that: The application includes using chromium-containing acidic sintered ore as blast furnace charge for blast furnace smelting.

14. The use according to claim 13, characterized in that The mass percentage of the chromium-containing acidic sintered ore in the blast furnace charge is 5-10%.

15. The use according to claim 13, characterized in that The air temperature during blast furnace smelting is 1100-1300°C.

16. The use according to claim 13, characterized in that The air flow rate during blast furnace smelting is 3200-3300m 3 / min.

17. The use according to claim 13, wherein The blast furnace pressure difference during the blast furnace smelting is ≤185kPa.

18. The use according to claim 13, wherein The oxygen enrichment rate in the blast furnace smelting is 4-4.5%.

19. The use according to claim 13, wherein The basicity of the slag in the blast furnace smelting is 1.08-1.18.