Vanadium titano-magnetite briquettes and titania-containing slag

Abstract

The application relates to a vanadium-titanium magnetite briquette and a titanium-containing slag. Raw material components of the vanadium-titanium magnetite briquette include: a vanadium-titanium magnetite concentrate, a titanium concentrate, an organic binder, a solid fuel, a flux and a solvent; wherein the ash content in the solid fuel is less than or equal to 8%. The vanadium-titanium magnetite briquette selects a solid fuel with low ash content, combines with the organic binder, reduces the SiO2 and Al2O3 content in the finished briquette, effectively improves the iron grade and TiO2 content of the briquette, and improves the quality of the briquette; meanwhile, the titanium concentrate is added in the raw material components, the TiO2 content of the briquette is improved. And the vanadium-titanium magnetite briquette has less impurities, which is beneficial to the subsequent preparation of the titanium-containing slag, and the TiO2 content in the titanium-containing slag is more than 42%, and the titanium recovery rate in the subsequent titanium-containing slag is more than 80%.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel metallurgy, and particularly relates to a vanadium-titanium magnetite briquette and a titanium-containing slag. BACKGROUND

[0002] Vanadium-titanium magnetite is a multi-element symbiotic iron ore mainly containing iron, vanadium and titanium, and also containing other useful elements such as cobalt, nickel, chromium, scandium and gallium, and has a high comprehensive utilization value.

[0003] The utilization of vanadium-titanium magnetite mainly includes a blast furnace method and a non-blast furnace method. The recovery utilization rates of iron, vanadium and titanium in the vanadium-titanium magnetite concentrate treated by the blast furnace method are 90%, 80% and 0% respectively, and the process has high energy consumption and high carbon emission. By using the non-blast furnace method, the recovery utilization of titanium is also difficult to truly implement, and through balling, pre-reduction and melting separation, the slag contains 30% of titanium dioxide and is not recovered and utilized. SUMMARY

[0004] The present application provides a vanadium-titanium magnetite briquette and a titanium-containing slag to solve the technical problem that the titanium resources in the existing vanadium-titanium magnetite cannot be effectively utilized.

[0005] In a first aspect, the present application provides a vanadium-titanium magnetite briquette, and a raw material component of the vanadium-titanium magnetite briquette includes:

[0006] Vanadium-titanium magnetite concentrate, titanium concentrate, organic binder, solid fuel, flux and solvent; wherein the ash content in the solid fuel is ≤8% by weight.

[0007] Optionally, the organic binder includes at least one of the following: gelatinized starch, syrup, pellidor, carboxymethyl cellulose sodium and the like.

[0008] Optionally, the organic binder is a mixture of gelatinized starch, syrup and pellidor.

[0009] Optionally, the flux is quicklime, and / or the solvent is water.

[0010] Optionally, by weight, the vanadium-titanium magnetite concentrate is 60-70 parts, the titanium concentrate is 5-15 parts,

[0011] the organic binder is 1.5-5 parts, the solid fuel is 8-20 parts, the flux is 1.5-3.5 parts, and the solvent is 7-12 parts.

[0012] Optionally, by weight, the vanadium-titanium magnetite concentrate is 62-68 parts, the titanium concentrate is 6.5-10

[0013] Optionally, by weight, the vanadium-titanium magnetite concentrate is 62-68 parts, the titanium concentrate is 6.5-10

[0014] The organic binder is 2-2.5 parts, the solid fuel is 10-16 parts, the flux is 1.8-3.2 parts, and the solvent is 8.5-11 parts.

[0015] In a second aspect, the application provides a titanium-containing slag, characterized in that the titanium-containing slag is obtained by pre-reducing and smelting the vanadium-titanium magnetite briquette according to any one of the embodiments of the first aspect, and the weight content of TiO2 in the titanium-containing slag is 42% or more.

[0016] Optionally, the pre-reduction temperature is 1260-1320 DEG C.

[0017] Optionally, the smelting temperature is 1550-1650 DEG C.

[0018] Optionally, the binary basicity of the titanium-containing slag is 0.4-0.6.

[0019] The above technical solutions provided by the embodiments of the application have the following advantages compared with the prior art:

[0020] The vanadium-titanium magnetite briquette according to the embodiments of the application uses vanadium-titanium magnetite concentrate as the main raw material component, and the titanium concentrate has the following effects: increasing the TiO2 content of the raw material, and thus increasing the Ti content in the titanium slag; the organic binder has the following effects: increasing the briquette strength, and the amount of SiO2 and Al2O3 brought by the inorganic binder is small; the solid fuel has the following effects: providing heat to increase the pre-reduction briquette strength, and providing a reducing atmosphere to improve the briquette reduction efficiency; the flux has the following effects: adjusting the briquette basicity, and binding various raw materials during briquetting; and the solvent has the following effects: binding and wetting the main raw materials during briquetting, and making the main raw materials into a shape. When conventional ash content solid fuel and inorganic binder are used, the conventional solid fuel ash and the inorganic binder contain a large amount of SiO2 and Al2O3, which reduces the iron grade and the TiO2 content of the finished briquette, and after electric furnace smelting, the TiO2 content in the titanium slag is low. In the embodiments of the application, the solid fuel with low ash content is combined with the organic binder to reduce the SiO2 and Al2O3 content in the finished briquette, effectively improve the iron grade and the TiO2 content of the briquette, and improve the quality of the briquette. Meanwhile, the titanium concentrate is added to the raw material components to increase the TiO2 content of the briquette, so that the vanadium-titanium magnetite briquette has less impurities, which is beneficial to the subsequent preparation of the titanium-containing slag, and the weight content of TiO2 in the titanium-containing slag is 42% or more, and the titanium yield in the subsequent titanium-containing slag is 80% or more. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced as follows. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0023] Figure 1 A flowchart of a preparation method of a titanium-containing slag provided by the embodiments of the present application. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of the present application.

[0025] Various embodiments of the present application can exist in the form of a range; it should be understood that the description in the form of a range is merely for the convenience and brevity, and should not be understood as a hard limitation on the scope of the present application; therefore, it should be considered that the described range has specifically disclosed all possible sub-ranges and single values within the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the described range, such as 1, 2, 3, 4, 5 and 6, which is applicable to any range. In addition, whenever a numerical range is indicated in this document, it refers to any cited number (fraction or integer) within the indicated range.

[0026] In the present application, the orientation words such as "upper" and "lower" are the directions of the drawing surface in the drawings unless otherwise stated. In addition, in the description of the present application, the terms "include", "contain" and the like mean "include but not limited to". In the present text, the relationship terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. In the present text, "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. In the present text, "at least one" means one or more, and "multiple" means two or more. "At least one", "at least one of the following" or the like means any combination of the items, including single item or any combination of multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can represent a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0027] Unless otherwise specified, the various raw materials, reagents, instruments and equipment used in the present application can be purchased on the market or can be prepared by existing methods.

[0028] In a first aspect, the present application provides a vanadium-titanium magnetite briquette, the raw material components of the vanadium-titanium magnetite briquette comprising:

[0029] Vanadium-titanium magnetite concentrate, titanium concentrate, organic binder, solid fuel, flux and solvent; wherein the ash content in the solid fuel is ≤8% by weight.

[0030] In the embodiments of the present application, vanadium-titanium magnetite concentrate is used as the main raw material component, and the role of titanium concentrate is to increase the TiO2 content of the raw material and thus increase the Ti content in the titanium slag. The role of the organic binder is to increase the briquette strength, and the amount of SiO2 and Al2O3 brought by the inorganic binder is less. The role of the solid fuel is twofold: first, to provide heat and increase the strength of the pre-reduced briquette, and second, to provide a reducing atmosphere and improve the reduction efficiency of the briquette. The role of the flux is to adjust the basicity of the briquette and to bind various raw materials during briquetting. The role of the solvent is to bind and wet the main raw materials during briquetting, so that they can be formed.

[0031] In the embodiments of the present application, the weight content of ash in the solid fuel is controlled, the amount of SiO2 and Al2O3 brought by the fuel is reduced, and the titanium content in the titanium-containing slag is increased. If the weight content of ash in the solid fuel is too high, the amount of SiO2 and Al2O3 brought by the fuel will be increased to some extent, and the titanium content in the titanium-containing slag will be reduced. The solid fuel can be anthracite, coke powder, petroleum coke, semi-coke, etc. Specifically, the weight content of ash in the solid fuel can be 8%, 7%, 6%, 5%, 4%, 3%, 2%, etc.

[0032] The vanadium-titanium magnetite concentrate has a particle size of greater than 70% of -200 mesh, an iron grade of greater than 50%, and a TiO2 content of not less than 10%;

[0033] The titanium concentrate has a TiO2 content of not less than 42%, and a sum of SiO2 and Al2O3 content of not higher than 4.5%; the fixed carbon content in the solid fuel is not less than 80%.

[0034] In some embodiments, the organic binder includes at least one of the following: gelatinized starch, syrup, pellidor, sodium carboxymethyl cellulose.

[0035] In some embodiments, the organic binder is a mixture of gelatinized starch, syrup, and pellidor.

[0036] The positive effects of selecting at least one of gelatinized starch, syrup, pellidor, and sodium carboxymethyl cellulose as the organic binder are that the above-mentioned organic binder has good binding effect, is inexpensive, and has wide industrial application. Preferably, the organic binder is a mixture of gelatinized starch, syrup, and pellidor.

[0037] In some embodiments, the flux is quicklime, and / or the solvent is water.

[0038] Selecting quicklime as the flux and water as the solvent are both common in the technical field and achieve the above-mentioned positive technical effects.

[0039] In some embodiments, the vanadium-titanium magnetite concentrate is 60-70 parts by weight, the titanium concentrate is 5-15 parts by weight, the organic binder is 1.5-5 parts by weight, the solid fuel is 8-20 parts by weight, the flux is 1.5-3.5 parts by weight, and the solvent is 7-12 parts by weight.

[0040] In some embodiments, the vanadium-titanium magnetite concentrate is 62-68 parts by weight, the titanium concentrate is 6-14 parts by weight, the organic binder is 1.5-5 parts by weight, the solid fuel is 8-20 parts by weight, the flux is 1.5-3.5 parts by weight, and the solvent is 7-12 parts by weight.

[0041] In some embodiments, the vanadium-titanium magnetite concentrate is 62-68 parts by weight, the titanium concentrate is 6-14 parts by weight, the organic binder is 1.5-5 parts by weight, the solid fuel is 8-20 parts by weight, the flux is 1.5-3.5 parts by weight, and the solvent is 7-12 parts by weight.

[0042] 6.5-10 parts, the organic binder is 2-2.5 parts, the solid fuel is 10-16 parts, the flux is 1.8-3.2 parts, and the solvent is 8.5-11 parts.

[0043] In the embodiments of the present application, the weight ratio of vanadium-titanium magnetite concentrate, titanium concentrate, organic binder, solid fuel, flux and solvent is controlled, and the ratio of vanadium-titanium magnetite to titanium concentrate determines the iron and titanium content of the briquette. An appropriate amount of organic binder and water can ensure the strength of the briquetted green ball. An appropriate amount of solid fuel can improve the metallization rate of the briquette in the reduction of the rotary hearth furnace. An appropriate amount of flux can adjust the basicity of the briquette and bind various raw materials during briquetting. If the above-mentioned ratio is not met, the following adverse effects will occur: if the titanium concentrate ratio is too high, it will affect the strength of the briquetted green ball; if the titanium concentrate ratio is too low, it will affect the titanium content of the briquette, and thus affect the titanium content in the molten slag; if the organic binder is too low, it will affect the strength of the briquetted green ball, and if it is too high, it will increase the production cost; if the solvent is too low, it will affect the strength of the briquetted green ball, and if it is too high, it will be muddy and stick to the equipment, affecting production; and too high or too low content of flux is not conducive to adjusting the basicity of the briquette. Specifically, the vanadium-titanium magnetite concentrate can be 60 parts, 62 parts, 64 parts, 66 parts, 68 parts, 70 parts, the titanium concentrate can be 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, etc., the organic binder can be 1.5 parts, 3 parts, 4.5 parts, 5 parts, etc., the solid fuel can be 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, etc., the flux can be 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, etc., and the solvent can be 7 parts, 9 parts, 11 parts, 12 parts, etc. Preferably, the vanadium-titanium magnetite concentrate is 62-68 parts, the titanium concentrate is 6.5-10 parts, the organic binder is 2-2.5 parts, the solid fuel is 10-16 parts, the flux is 1.8-3.2 parts, and the solvent is 8.5-11 parts.

[0044] The preparation method of the vanadium-titanium magnetite briquette is as follows: the vanadium-titanium magnetite concentrate, titanium concentrate, organic binder, solid fuel, flux and solvent are uniformly mixed in proportion, and then pressed into briquettes by a briquetting machine to obtain vanadium-titanium magnetite briquettes. The briquettes are dried in a chain grate machine and then sieved to obtain vanadium-titanium magnetite dry briquettes with a particle size of not less than 6 mm.

[0045] The vanadium-titanium magnetite concentrate is surface modified by fine grinding and high-pressure roller grinding to make the particle size of the vanadium-titanium magnetite concentrate finer and the specific surface area increase, thereby optimizing the balling property and minimizing the addition of the binder. Specifically, the particle size of the vanadium-titanium magnetite concentrate is less than 200 mesh, and the particle size of the vanadium-titanium magnetite concentrate is greater than 6 mm. The vanadium-titanium magnetite concentrate is mixed with the titanium concentrate, organic binder, solid fuel, flux and solvent to obtain vanadium-titanium magnetite briquettes with a diameter greater than 6 mm.

[0046] Because of the poor hydrophilicity and ballability of vanadium-titanium magnetite and titanium concentrate, especially the poor ballability index of titanium concentrate, when a belt roaster or a grate-kiln process is selected, the green ball strength of the disc balling machine is poor, and it is extremely difficult to improve the titanium grade of the briquette by adding titanium concentrate in the raw material. The problem of poor hydrophilicity and ballability of vanadium-titanium magnetite and titanium concentrate is overcome by briquetting process through mechanical pressure to make the raw material into briquette, thereby improving the briquette strength.

[0047] In a second aspect, the present application provides a titanium-containing slag, characterized in that the titanium-containing slag is obtained by pre-reducing and smelting the vanadium-titanium magnetite briquette according to any one of the embodiments of the first aspect, and the weight content of TiO2 in the titanium-containing slag is 42% or more.

[0048] Specifically, the rotary hearth furnace pre-reduction: the vanadium-titanium magnetite briquette enters the rotary hearth furnace for pre-reduction to obtain a vanadium-titanium magnetite pre-reduction briquette; the electric furnace smelting: the vanadium-titanium magnetite pre-reduction briquette is loaded into the electric furnace for smelting to separate a vanadium-containing molten iron and a titanium-containing slag. The preparation process of the titanium-containing slag is shown in Figure 1 .

[0049] In some embodiments, the temperature of the pre-reduction is 1260℃-1320℃.

[0050] In the embodiments of the present application, the temperature of the pre-reduction is controlled to ensure the metallization rate of the pre-reduction briquette, the energy consumption is reasonable, and the service life of the equipment is not affected. If the temperature of the pre-reduction is too high, it will cause higher energy consumption to a certain extent, and the too high pre-reduction temperature will affect the service life of the hearth; if the temperature of the pre-reduction is too low, it will cause insufficient metallization rate of the pre-reduction briquette to a certain extent, which affects the subsequent electric furnace operation. Specifically, the temperature of the pre-reduction can be 1260℃, 1270℃, 1280℃, 1290℃, 1300℃, 1310℃, 1320℃, etc. The above pre-reduction is carried out in a rotary hearth furnace, and the time of the above pre-reduction can be 30min-90min; the reducing gas introduced into the rotary hearth furnace for pre-reduction is one or more of natural gas, blast furnace gas, coke oven gas, and converter gas. Preferably, the pre-reduction temperature can be 1280-1320℃, and the reduction time can be 40min-60min.

[0051] In some embodiments, the temperature of the smelting is 1550℃-1650℃.

[0052] In the embodiments of the present application, the temperature of the melting separation is controlled, and a suitable melting separation temperature can improve production efficiency and reduce energy consumption per ton of iron. If the temperature of the melting separation is too high, it will increase energy consumption and reduce the service life of the equipment to some extent. If the temperature of the melting separation is too low, it will lead to difficulty in slag-iron separation and prolong the slag-iron separation time, thereby reducing the utilization coefficient of the equipment to some extent. Specifically, the temperature of the melting separation can be 1550℃, 1570℃, 1590℃, 1610℃, 1630℃, 1650℃, etc. The above melting separation is carried out in an electric furnace, and the melting separation time can be 40-200 min. More than 90% of titanium in the pre-reduced briquettes used for electric furnace melting separation enters the titanium-containing slag. Preferably, the electric furnace melting separation temperature can be 1580-1620℃, and the melting separation time can be 60-150 min.

[0053] In some embodiments, the binary basicity of the titanium-containing slag is 0.4-0.6.

[0054] In the embodiments of the present application, since the flux is added to the vanadium-titanium magnetite briquettes, there is no need to add additional flux to adjust the basicity during the melting separation, so that the preparation of the titanium-containing slag is more simple. During the melting separation, if the binary basicity of the titanium-containing slag is too large, it will reduce the titanium content in the titanium-containing slag to some extent, affecting the subsequent utilization of the titanium slag. If the binary basicity of the titanium-containing slag is too small, it will affect the slag-iron separation due to poor flowability of the slag. Specifically, the binary basicity of the pre-reduced vanadium-titanium magnetite briquettes can be 0.4, 0.5, 0.6, etc.

[0055] In the embodiments of the present application, the above briquetting machine (briquetting), rotary hearth furnace (pre-reduction), and electric melting furnace (melting separation) are all mature process equipment, and large-scale modification based on existing process equipment is not required to realize the comprehensive utilization of vanadium-titanium magnetite.

[0056] The above melting separation can obtain titanium-containing slag and vanadium-containing molten iron. The obtained vanadium-containing molten iron is used for vanadium extraction in a converter and steelmaking, and the titanium-containing slag is used for titanium extraction by a sulfuric acid method. The recovery rate of iron in the vanadium-containing molten iron is more than 90%, and the recovery rate of vanadium in the vanadium-containing molten iron is more than 70%. The recovery rate of titanium in the titanium-containing slag is more than 80%.

[0057] The titanium-containing slag is realized based on the above vanadium-titanium magnetite briquettes. The raw material components of the vanadium-titanium magnetite briquettes can refer to the above embodiments. Since the titanium-containing slag adopts part or all of the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0058] The present application is further described below in connection with specific examples. It is understood that these examples are merely for illustrative purposes and do not limit the scope of the present application. The experimental methods in the following examples, if not otherwise specified, are generally determined according to national standards. If there is no corresponding national standard, it is determined according to the general international standard, the conventional condition, or according to the condition suggested by the manufacturer.

[0059] The main chemical component content of the vanadium-titanium magnetite concentrate used in Comparative Example 1 and Examples 1-3 is (wt%): TFe: 55.28%, FeO: 28.40%, SiO2: 3.63%, V2O5: 0.56%, TiO2: 11.50%, S: 0.39%; the proportion of the particle size of -200 mesh in the vanadium-titanium magnetite concentrate is 75.3%.

[0060] The main chemical component content of the titanium concentrate is (wt%): TiO2: 45.66%, TFe: 34.38%, SiO2: 2.34%, Al2O3: 0.95%.

[0061] Comparative Example 1

[0062] 1) Vanadium-titanium magnetite briquetting: 68 parts of vanadium-titanium magnetite concentrate, 4 parts of binder, 18 parts of coke powder (CDQ powder), and 10 parts of water are uniformly mixed and briquetted to obtain vanadium-titanium magnetite briquettes. The briquettes are dried in a chain grate machine and then sieved to obtain vanadium-titanium magnetite dry balls with a particle size greater than 6 mm; wherein the binder is a composite binder composed of bentonite and an organic binder; the ash content of the coke powder (CDQ powder) is 13.85 wt%, and the fixed carbon is 84.64 wt%.

[0063] 2) Rotary hearth furnace pre-reduction: the vanadium-titanium magnetite dry briquettes are pre-reduced in a rotary hearth furnace at a reduction temperature of 1280-1320°C for 60 min to obtain vanadium-titanium magnetite pre-reduced briquettes; the main chemical component content of the vanadium-titanium magnetite pre-reduced briquettes is (wt%): TFe: 56.04%, MFe: 38.26%, V2O5: 0.62%, TiO2: 10.09%;

[0064] 3) Electric furnace smelting: the vanadium-titanium magnetite pre-reduced briquettes are loaded into an electric furnace for smelting, and quicklime is added to adjust the basicity, the smelting basicity is 0.45, the smelting temperature is 1600°C, and the smelting time is 80 min, to separate vanadium-containing molten iron and titanium-containing slag;

[0065] The TiO2 content of the titanium-containing slag is 36.5%.

[0066] 4) The obtained vanadium-containing molten iron is used for converter refining, and the titanium-containing slag cannot be effectively recovered due to low titanium content.

[0067] Example 1

[0068] 1) Vanadium-titanium magnetite briquetting: Vanadium-titanium magnetite concentrate 62 parts by weight, titanium concentrate 10 parts, organic binder 2.5 parts, low-ash high-fixed carbon fuel 14 parts, quicklime 2 parts and water 9.5 parts are uniformly mixed and then briquetted to obtain vanadium-titanium magnetite briquettes. The briquettes are dried in a chain grate machine and then sieved to obtain vanadium-titanium magnetite dry briquettes with a particle size greater than 6 mm; wherein the organic binder is a mixed binder of gelatinized starch, syrup and Peli Du; the low-ash high-fixed carbon fuel has an ash content of 7.6 wt% and a fixed carbon content of 82.1 wt%;

[0069] 2) Rotary hearth furnace pre-reduction: The vanadium-titanium magnetite dry briquettes with qualified particle size are put into a rotary hearth furnace for pre-reduction at a reduction temperature of 1280-1320℃ for 60 min to obtain vanadium-titanium magnetite pre-reduced briquettes; the main chemical components of the vanadium-titanium magnetite pre-reduced briquettes are (wt%): TFe: 59.39%, MFe: 48.14%, V2O5: 0.53%, TiO2: 12.75%;

[0070] 3) Electric furnace smelting: The vanadium-titanium magnetite pre-reduced briquettes are loaded into an electric furnace for smelting at a smelting temperature of 1600℃, a slag binary basicity (CaO / SiO2) of 0.45 and a smelting time of 80 min to separate vanadium-containing molten iron and titanium-containing slag;

[0071] Among them, the TiO2 content of the titanium-containing slag reaches 45.8%, and more than 98.3% of the titanium in the pre-reduced briquettes used for electric furnace smelting enters the titanium-containing slag.

[0072] 4) The obtained vanadium-containing molten iron is used for vanadium extraction in a converter, and the titanium-containing slag is extracted by a sulfuric acid method.

[0073] Among them, the iron recovery rate in the vanadium-containing molten iron reaches 96.7%, and the vanadium recovery rate is 76%; the titanium recovery rate in the titanium-containing slag is 82%.

[0074] Example 2

[0075] 1) Vanadium-titanium magnetite briquetting: Vanadium-titanium magnetite concentrate 62 parts by weight, titanium concentrate 10 parts, organic binder 2.5 parts, low-ash high-fixed carbon fuel 13.8 parts, quicklime 2.2 parts and water 9.5 parts are uniformly mixed and then briquetted to obtain vanadium-titanium magnetite briquettes. The briquettes are dried in a chain grate machine and then sieved to obtain vanadium-titanium magnetite dry briquettes with a particle size greater than 6 mm;

[0076] Among them, the organic binder is a mixed binder of gelatinized starch, syrup and Peli Du; the low-ash high-fixed carbon fuel is petroleum coke, with an ash content of 1.8 wt% and a fixed carbon content of 86.6 wt%;

[0077] 2) Rotary hearth pre-reduction: the vanadium-titanium magnetite dry briquettes enter the rotary hearth for pre-reduction, the reduction temperature is 1280-1320℃, the reduction time is 60 min, and the vanadium-titanium magnetite pre-reduction briquettes are obtained; the main chemical components of the vanadium-titanium magnetite pre-reduction briquettes are (wt%): TFe: 61.52%, MFe: 50.54%, V2O5: 0.57%, TiO2: 14.4%;

[0078] 3) Electric furnace smelting: the vanadium-titanium magnetite pre-reduction briquettes are loaded into the electric furnace for smelting, the smelting temperature is 1600℃, the slag basicity is 0.4, the smelting time is 80 min, and the vanadium-containing molten iron and the titanium-containing slag are separated;

[0079] Among them, the TiO2 content of the titanium-containing slag reaches 48.7%, and more than 98.7% of the titanium in the pre-reduction briquettes for electric furnace smelting enters the titanium-containing slag.

[0080] 4) The obtained vanadium-containing molten iron is used for vanadium extraction in a converter, and the titanium-containing slag is used for titanium extraction by a sulfuric acid method.

[0081] Among them, the iron recovery rate in the vanadium-containing molten iron reaches 97.1%, and the vanadium recovery rate is 74%; the titanium recovery rate in the titanium-containing slag is 84%.

[0082] Example 3

[0083] 1) Vanadium-titanium magnetite briquetting: 62 parts of vanadium-titanium magnetite concentrate, 10 parts of titanium concentrate, 2.5 parts of organic binder, 13 parts of low-ash high-fixed carbon fuel, 3 parts of quicklime and 9.5 parts of water are mixed and uniformly mixed to form briquettes, and the briquettes are dried in a chain grate machine and then sieved to obtain vanadium-titanium magnetite dry briquettes with a particle size greater than 6 mm;

[0084] Among them, the organic binder is a mixed binder of gelatinized starch, syrup and pellitol; the low-ash high-fixed carbon fuel is petroleum coke, with an ash content of 1.8wt% and a fixed carbon content of 86.6wt%;

[0085] 2) Rotary hearth pre-reduction: the vanadium-titanium magnetite dry briquettes enter the rotary hearth for pre-reduction, the reduction temperature is 1280-1320℃, the reduction time is 60 min, and the vanadium-titanium magnetite pre-reduction briquettes are obtained; the main chemical components of the vanadium-titanium magnetite pre-reduction briquettes are (wt%): TFe: 60.52%, MFe: 50.4%, V2O5: 0.56%, TiO2: 14.1%;

[0086] 3) Electric furnace smelting: the vanadium-titanium magnetite pre-reduction briquettes are loaded into the electric furnace for smelting, the smelting temperature is 1600℃, the slag basicity is 0.55, the smelting time is 80 min, and the vanadium-containing molten iron and the titanium-containing slag are separated;

[0087] The TiO2 content of the titanium-containing slag is 46.9%, and more than 98.7% of the titanium in the pre-reduced briquettes for electric furnace melting and separation enters the titanium-containing slag.

[0088] 4) The obtained vanadium-containing molten iron is used for converter vanadium extraction, and the titanium-containing slag is used for titanium extraction by sulfuric acid method.

[0089] The iron recovery rate of the vanadium-containing molten iron is 97.1%, the vanadium recovery rate is 74%, and the titanium recovery rate of the titanium-containing slag is 84%.

[0090] The above description is merely a specific implementation of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vanadium titano-magnetite agglomerate, characterized in that, The raw material components of the vanadium-titanium magnetite briquette include: vanadium-titanium magnetite concentrate, titanium concentrate, organic binder, solid fuel, flux and solvent, wherein the ash content in the solid fuel is ≤8% by weight; the organic binder is a mixture of gelatinized starch, syrup and Peli Du; the flux is quicklime, and / or the solvent is water; by weight, the vanadium-titanium magnetite concentrate is 60-70 parts, the titanium concentrate is 5-15 parts, the organic binder is 1.5-5 parts, the solid fuel is 8-20 parts, the flux is 1.5-3.5 parts, and the solvent is 7-12 parts.

2. The vanadium titano-magnetite agglomerates according to claim 1, characterized in that, by weight, the vanadium-titanium magnetite concentrate is 62-68 parts, the titanium concentrate is 6.5-10 parts, the organic binder is 2-2.5 parts, the solid fuel is 10-16 parts, the flux is 1.8-3.2 parts, and the solvent is 8.5-11 parts.

3. A titanium-containing slag, characterized in that, The titanium-containing slag is obtained by pre-reducing and smelting separation of the vanadium-titanium magnetite briquette according to claim 1 or 2, and the weight content of TiO2 in the titanium-containing slag is ≥42%.

4. The titanium-containing slag according to claim 3, characterized in that, The temperature of the pre-reduction is 1260-1320°C.

5. The titanium-containing slag according to claim 3, characterized in that, The temperature of the smelting separation is 1550-1650°C.

6. The titanium-containing slag according to any one of claims 3 to 5, characterized in that The binary basicity of the titanium-containing slag is 0.4-0.6.

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