AU2014201184B2

AU2014201184B2 - Titanium-containing additive

Info

Publication number: AU2014201184B2
Application number: AU2014201184A
Authority: AU
Inventors: Djamschid Amirzadeh-Asl
Original assignee: Sachtleben Chemie GmbH
Current assignee: Venator Germany GmbH
Priority date: 2006-08-02
Filing date: 2014-03-04
Publication date: 2015-12-17
Anticipated expiration: 2027-08-02
Also published as: AU2014201184A1

Abstract

Titanium-containing additive, characterised in that it contains titanium containing materials that are able to form high-temperature-resistant and wear 5 resistant titanium compounds, such as, for example, aluminium titanates, magnesium titanates, Ti(C,N) compounds or mixtures of such compounds, in processes or during the production of products with co-reactants that are contained in these processes or with suitable co-reactants that are present during the production of products, wherein the titanium-containing materials consist at 10 least in part of fine-grained, natural titanium-containing materials and/or in part of fine-grained TiO 2-rich slags

Description

Titanium-containing additive The subject matter of the invention is a titanium containing additive, a method for its production, and its use. 5 The use of titanium-containing additives in metallurgical processes has been known for a long time. The action of titanium-containing additives is based, in this connection, on the formation of high temperature-resistant and wear-resistant Ti(C,N) 10 compounds that have temperature-dependent solubility in crude iron. When there is a fall below the solubility limit, which can be the case in particular in defective hearth regions as a result of increased heat dissipation outwards, the separation of the Ti(C,N) 15 compounds from the crude iron, the deposit thereof in the regions of the brickwork that are worn to a greater extent and thus an intrinsic "heat-repair effect" result. For this purpose, various titanium-containing materials 20 are used in metallurgical processes or for the production of products. The titanium-containing additives that are used in the prior art are usually titanium-containing materials. Thus, for example, the use of residues from TiO 2 25 production (TiO 2 residues) as a titanium-containing additive is known in the metallurgical industry. A titanium-containing additive consisting of TiC 2 residues and further substances is disclosed in DE-C-4419816. DE-C-19705996 discloses a method for producing a TiC 2 30 containing additive. In this case, a mixture of TiO 2 residues and iron or iron compounds is thermally treated at 200 to 1300"C. A disadvantage of this technical teaching is the complicated metering and mixing of the Tic 2 residues with the other respective constituents of the additive. EP-A-0 611 740 discloses the use of residues from TiO 2 5 production (TiO 2 residues) with other constituents as a titanium-containing additive in order to increase the durability of the refractory brick lining of a furnace. In this connection, TiO 2 -containing moulded bodies, such as briquettes, pellets or granular material, are 10 produced from the residues in elaborate methods. However, these products are very lumpy, and in metallurgical processes and in order to produce products cannot be used, or can only be used with poor results. 15 Furthermore, the injection of finely divided titanium containing additives directly into the region of the hearth is known. The injection of titanium-containing additives in the region of the hearth has a series of advantages: 20 - the introduction is effected in the immediate vicinity of the points of damage or the regions of the brick lining that are to be protected; thus the titanium-containing substances can be used in a targeted manner and in lower concentrations; 25 - the time of action, in particular when hot spots occur in the wall of the furnace, is shorter; - no incrustation by titanium-containing substances occurs in the blast furnace shaft; - smaller quantities used and a higher degree of 30 conversion to Ti(C,N) compounds result in improved slag quality as a result of lower TiO 2 contents and thus less problematic marketing of the slag sand.

:3 It is also known that lump ilmenite (ilmenite structure: FeTiO 3 ) can be used as a natural source for the titanium that is required in order to reduce wear in the blast furnace. 5 The titanium ore ilmenite, a mineral with the formula FeTiO 3 , is used as a starting material for the production of titanium dioxide. Ilmenite is used for this purpose also in combination with the titanium ore rutile (TiO 2 ) 10 The extraction of ilmenite ore is effected in open-cast mining. In this connection, the ore is first broken into small pieces with a size of approximately 12 mm and then ground to a fine powder. The impurities contained in the ore are separated in an elaborate 15 method. After the gangue has been separated, an ilmenite concentrate is obtained from the ore with a proportion of titanium dioxide of approximately 50 % by weight (calculated from the total titanium content). (When proportions of titanium dioxide in % by weight 20 are spoken of in the following, unless otherwise specified, within the meaning of the invention what is meant thereby is the proportion calculated from the total titanium content). Moreover, titanium-dioxide-rich slag is used as a raw 25 material to obtain titanium dioxide. In this case, ilmenite ore is worked and comminuted in the seam. Subsequently, the ground ore is mixed with coal and melted in an arc furnace. Quality iron is produced thereby. The titanium-dioxide-rich slag, for example 30 the so-called Sorel slag, that is yielded in this process can contain up to 90 % by weight titanium dioxide (calculated from the total titanium content).

Ll In contrast with synthetic titanium-containing materials, the natural titanium-containing materials, on account of their lumpiness or their lack of fine granularity, are not suitable or are only suitable in 5 part and with poor results for use in metallurgical processes, for use in refractory materials, for injection into metallurgical furnaces in order to increase the durability of the furnace brick linings, for injection into slag foams in steel production, for 10 use in tap-hole compounds, for use in carbon/graphite electrodes, for use as an additive for building materials, for carbon/graphite bricks, for carbon/graphite tamping compounds, for carbon-bound products, as catalysts. The lack of fine granularity 15 and the angular structure of the particles of these natural raw materials give rise as a result of their abrasive properties in use, for example when blown into a blast furnace, to severe erosion (corrosion; wear...) in the blow moulds so that long-lasting use is not 20 possible. In the case of the production of products, the reaction rate is insufficient when natural titanium-containing materials are used on account of their lumpiness or their lack of fine granularity and leads to unsatisfactory results. Consequently, the 25 natural titanium-containing materials that are present in this form cannot be used as titanium-containing additives within the meaning of the invention. An object of the present invention is to provide titanium-containing additives on a natural basis. 30 A further object of the present invention is to provide titanium-containing additives based on TiO 2 -rich slags. What is to be understood by "titanium-containing additive" within the meaning of the invention is fine grained titanium-containing additives that are able to 5 form high-temperature-resistant and wear-resistant titanium compounds, such as, for example, aluminium titanates, magnesium titanates, Ti(C,N) compounds or mixtures of such compounds, in processes or during the 5 production of products with co-reactants that are contained in these processes or with suitable co reactants that are present during the production of products. "On a natural basis" within the meaning of the invention signifies that the titanium-containing 10 portion of the titanium-containing additives consists up to 100 % of natural titanium-containing material. In particular, an object of the present invention is to provide such titanium-containing additives a for use in metallurgical processes, 15 a for use in refractory materials, a for injection in metallurgical furnaces in order to increase the durability of the furnace brick linings, a for use in steel production, 20 a for the formation of slag foams in steel production, * for use in tap-hole compounds, a for injection-moulding, channel and/or repair compounds, 25 a for use in carbon/graphite electrodes, a for use as an additive for building materials, 6 5 a for use in carbon/graphite bricks, for use in carbon/graphite tamping compounds, for use in carbon-bound products, and e as a catalyst. In accordance with the invention, there is provided a method for increasing the durability of a brick lining of a metallurgical furnace by injecting a titanium 10 containing additive together with a metallurgical furnace gas into the metallurgical furnace, wherein the temperature of the furnace is sufficient such that the titanium containing additive forms a high temperature resistant and wear-resistant titanium compound, wherein the titanium-containing additive has a 100% fineness of less than 0.2 mm, and wherein the titanium-containing additive is able to form high 15 temperature resistant and wear-resistant aluminium titanates, magnesium titanates and/or Ti(C,N) compounds or mixtures thereof in a process or during the production of a product with a co-reactant contained in the process or production with a suitable co-reactant that is present during the process or production, wherein the titanium-containing additive includes a fine grained TiO2-rich slag. 20 The titanium-containing materials may be micronized in a suitable way therefor. The micronization can then be effected, for example, in a pinned-disk mill, a Coloplex mill, a Circoplex mill, a steam or air-jet mill or ball mill or in a grinding dryer. The titanium-containing material that is obtained in this way has a 100 % fineness of less than 2 mm, particularly preferably less than 0.5 mm and 25 especially preferably less than 0.2 mm. The average particle size, in accordance with the invention, amounts preferably to 0.01 pm to 2,000 pm, especially preferably to 2.00 pm or less. The material thus obtained is suitable as a titanium-containing additive within the meaning of the invention. Titanium ores, titanium-dioxide-rich slags or mixtures of these materials in any 30 composition can be used as titanium-containing starting materials. The titanium ores and titanium-dioxide-rich slags used to produce the titanium containing additive may contain 15 to 95, preferably 25 to 90 % by weight TiO 2 (calculated from the total titanium content). The titanium ores can be used in an unrefined form or after separation of impurities and also the gangue in order to 35 produce the titanium-containing additive.

7 The additive may contain 20 to 98, preferably 25 to 95, particularly preferably 30 to 95, especially preferably 40 to 90 % by weight TiC 2 (calculated from the total titanium content). The additive can contain in addition to the titanium-containing materials, selected 5 from titanium ores and/or titanium-dioxide-rich slags, furthermore, synthetic titanium-dioxide-containing materials. The synthetic titanium-dioxide-containing materials that are provided contain 20 to 100, preferably 30 to 100 % by weight TiO 2 (calculated from the total titanium content). 10 The synthetic titanium-dioxide-containing materials can then be selected from the materials listed below or mixtures thereof: - intermediate, coupled and/or finished products from the production of titanium dioxide. The materials can then originate not only from the production of titanium dioxide in accordance with the sulphate process, but 15 also from the production of titanium oxide in accordance with the chloride process. The intermediate and coupled products can be drawn off from the current TiO 2 -production. - residues from the production of titanium dioxide. The materials can then originate not only from the production of titanium dioxide in accordance 20 with the sulphate process, but also from the production of titanium dioxide in accordance with the chloride process; if necessary, the materials are pretreated before use for the production of titanium-containing additives, for example by neutralization, washing and/or pre-drying. - residues from the chemical industry, for example from TiO 2 -containing 25 catalysts, in turn, for example, from DENOX catalysts. The synthetic titanium-dioxide-containing materials can be used in the form of powders, filter cakes, pastes or suspensions. The production of the additive may be effected by mixing the titanium-containing materials. 30 In addition, the titanium-containing materials can be heat-treated.

8 Drying is preferably used as heat-treatment, and particularly preferably drying at temperatures between 100 and 12000C. It is also preferably provided that the titanium-containing materials are first micronized separately and then mixed in a mixer in the desired ratio depending 5 on the application. Furthermore, it is preferably provided that the titanium containing materials are mixed first and micronized after heat-treatment depending on the application. Depending on the intended use, the titanium-containing additive can contain further auxiliary substances and/or additives, for example coal, reducing carbon, 10 and/or metal oxides, again for example iron oxides. The additive may be used in the following applications: * in metallurgical processes, " in refractory materials, * for injection in metallurgical furnaces in order to increase the durability 15 of the furnace brick linings, * in steel production, * for the formation of slag foams in steel production, * in tap-hole compounds, " in injection-moulding, channel and/or repair compounds, 20 * in carbon/graphite electrodes, * as an additive for building materials, " for the production of carbon/graphite bricks, carbon/graphite tamping compounds, carbon-bound products, and * as a catalyst 25

Claims

1. A method for increasing the durability of a brick lining of a metallurgical furnace by injecting a titanium containing additive together with a metallurgical furnace gas into the metallurgical furnace, wherein the temperature of the furnace is sufficient such that the titanium containing additive forms a high temperature resistant and wear-resistant titanium compound, wherein the titanium-containing additive has a 100% fineness of less than 0.2 mm, and wherein the titanium-containing additive is able to form high-temperature resistant and wear-resistant aluminium titanates, magnesium titanates and/or Ti(C,N) compounds or mixtures thereof in a process or during the production of a product with a co reactant contained in the process or production with a suitable co reactant that is present during the process or production, wherein the titanium-containing additive includes a fine grained TiO 2 -rich slag.

2. The method according to claim 1, wherein the titanium containing additive is a titanium-containing slag.

3. The method according to claim 1, wherein the titanium containing additive further includes a fine grained, natural titanium containing material.

4. The method according to claim 1, wherein the titanium containing additive further includes a titanium-containing ore and/or a synthetic titanium-containing material selected from an intermediate, coupled or finished product from the production of titanium dioxide, wherein the synthetic titanium containing material can be prepared from the production of titanium dioxide in accordance with the sulphate process, but also from the production of titanium oxide in accordance with the chloride process, and the intermediate and coupled products can be drawn off from the current TiO 2 -production; residues from the production of titanium dioxide or mixtures thereof, in which case the materials can then originate not only from the production of titanium dioxide in accordance with the sulphate process, but also from the production of titanium dioxide in accordance with the chloride process; titanium containing residues from the chemical industry. 10

5. The method according to claim 1, wherein the titanium-containing slag is Sorel slag.

6. The method according to claim 1, wherein the titanium-containing additive contains 15 to 95% by weight TiO 2 calculated from the total titanium content.

7. The method according to claim 1, including 20 to 98% by weight TiO 2 calculated from the totaltitanium content.

8. The method according to claim 1, further including a further additive selected from the group consisting of coal, reducing carbon or a metal oxide.