Titanium tetrachloride slurry treatment method and titanium tetrachloride preparation method
By re-engaging the carbon-containing mud produced during the preparation of titanium tetrachloride into the molten salt chlorination reaction, and using its reducing properties, the problem of large energy loss in the refined carbon-containing mud treatment method in the prior art is solved, and efficient resource utilization and cost savings are achieved.
Patent Information
- Application Number
- CN202510177447.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2025-05-13
AI Technical Summary
In the prior art, the treatment method of refined carbon-containing slurry recovers titanium tetrachloride by evaporation and concentration of ore slurry, resulting in large energy loss and increased production costs.
The carbon-containing mud produced during the preparation of titanium tetrachloride is re-entered in the molten salt chlorination reaction process, and the reduction of carbon in the carbon-containing mud is used to adjust its flow rate to reduce the reduction dose added to the reaction process.
By recycling carbon-containing slurry, it improves its utilization value, and reduces the consumption of reducing agents by fully utilizing its reducing properties, saving industrial raw materials costs.
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Abstract
Description
Technical Field
[0001] The invention relates to the field of titanium metallurgy, and in particular to a titanium tetrachloride slurry treatment method and a titanium tetrachloride preparation method. Background Art
[0002] In the process of producing refined titanium tetrachloride, the titanium-containing raw materials (such as high-titanium slag, rutile, etc.) are first converted into a crude product containing titanium tetrachloride and many impurities through molten salt chlorination, and then the crude product is refined by removing vanadium impurities and some other impurities using mineral oil, and finally a high-purity refined titanium tetrachloride is obtained. In this process, a large amount of refined carbon-containing slurry is generated. The refined carbon-containing slurry contains titanium tetrachloride and a large amount of carbon-containing organic matter.
[0003] In the prior art, the method for treating refined carbon-containing mud is to recover titanium tetrachloride by evaporating and concentrating the slurry. The titanium tetrachloride contained therein is evaporated and condensed into a liquid through the slurry evaporation process and then recovered. The carbon-containing and vanadium-containing impurities are converted from liquid to solid waste residue, and only organic carbon can be treated as waste residue. At the same time, a large amount of energy will be consumed in the process of slurry evaporation and concentration, which will lead to an increase in production costs. Summary of the invention
[0004] In view of the problem that in the prior art, a method for treating refined carbon-containing sludge is to perform pulp evaporation and concentration to recover titanium tetrachloride, the titanium tetrachloride contained therein is evaporated and condensed into a liquid state through a pulp evaporation process and then recovered, and carbon-containing and vanadium-containing impurities are converted from liquid to solid waste residue, and only organic carbon can be treated as waste residue. At the same time, a large amount of energy is consumed in the process of pulp evaporation and concentration treatment, resulting in an increase in production costs. The present invention provides a titanium tetrachloride sludge treatment method and a titanium tetrachloride preparation method.
[0005] According to a first aspect of the present invention, there is provided a method for treating titanium tetrachloride slurry, comprising: The carbon-containing slurry generated in the titanium tetrachloride preparation process is re-involved in the molten salt chlorination reaction process, and the reducing property of carbon in the carbon-containing slurry is utilized, wherein the flow rate of the carbon-containing slurry re-involved in the molten salt chlorination reaction process is adjusted to reduce the amount of reducing agent actually added to the molten salt chlorination reaction process.
[0006] In some embodiments, the re-participating in the molten salt chlorination reaction process includes: The carbon-containing slurry produced in the titanium tetrachloride preparation process is returned to the chlorination furnace under the chlorine atmosphere through a pipeline, so that the carbon in the carbon-containing slurry reacts with the titanium-containing oxide in a molten salt chlorination reaction.
[0007] In some embodiments, as the carbon content in the carbon-containing mud increases, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is increased, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is correspondingly reduced.
[0008] In some embodiments, the carbon content in the carbonaceous mud is greater than 0% and less than or equal to 1.4%.
[0009] In some embodiments, according to the carbon content in the carbon-containing mud gradually increasing within the range of greater than 0% and less than or equal to 1.4%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to gradually increase within the range of greater than 0 and less than or equal to 1.12 t / h, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is correspondingly adjusted to gradually decrease within the range of greater than 0 and less than or equal to 0.69 t.
[0010] In some embodiments, according to the carbon content of the carbon-containing mud being 0.8%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to 0.64 t / h, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is adjusted to 0.29~0.45 t.
[0011] In some embodiments, according to the carbon content of the carbon-containing mud being 1%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to 0.8t, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is adjusted to 0.19~0.39t.
[0012] In some embodiments, according to the carbon content of the carbon-containing mud being 1.2%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to 0.96t, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is adjusted to 0.09~0.33t.
[0013] In some embodiments, the reducing agent comprises petroleum coke.
[0014] According to a second aspect of the present invention, there is also provided a method for preparing titanium tetrachloride, comprising: Adding a reducing agent and titanium-containing oxide into a chlorination furnace to generate a molten salt chlorination reaction, and obtaining carbon-containing mud generated during the reaction; And a titanium tetrachloride slurry treatment method as described in any of the above items to prepare titanium tetrachloride.
[0015] The above-mentioned titanium tetrachloride slurry treatment method re-involves the carbon-containing slurry generated in the titanium tetrachloride preparation process in the molten salt chlorination reaction, and uses the reducing property of carbon in the carbon-containing slurry to adjust the flow rate of the carbon-containing slurry re-involved in the molten salt chlorination reaction process, thereby reducing the amount of reducing agent actually added to the molten salt chlorination reaction process. By re-involving the carbon-containing slurry in the molten salt chlorination reaction process, on the one hand, the carbon-containing slurry is recycled and reused, thereby increasing the utilization value of the carbon-containing slurry; on the other hand, the reducing property of carbon in the carbon-containing slurry is fully utilized, thereby reducing the amount of reducing agent actually added, reducing the consumption of reducing agent, and saving the cost of industrial raw materials.
[0016] At the same time, the titanium tetrachloride preparation method provided by the present invention can also achieve the above technical effects, which will not be described in detail. DETAILED DESCRIPTION
[0017] The following embodiments of the present disclosure are further described in detail in conjunction with the examples. The detailed description of the following embodiments is used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
[0018] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.
[0019] In addition, the words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.
[0020] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.
[0021] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.
[0022] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in the present invention, it is easy for those skilled in the art to appreciate that multiple modifications are feasible without actually departing from the teaching of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, changes and deletions may be made to the design, operating conditions and parameters of the following exemplary embodiments.
[0023] According to the first aspect of the present invention, the present invention provides a titanium tetrachloride slurry treatment method, comprising: re-involving the carbon-containing slurry generated in the titanium tetrachloride preparation process in a molten salt chlorination reaction process, utilizing the reducing property of carbon in the carbon-containing slurry, wherein the flow rate of the carbon-containing slurry re-involved in the molten salt chlorination reaction process is adjusted to reduce the amount of reducing agent actually added to the molten salt chlorination reaction process.
[0024] Specifically, carbon-containing mud is a waste generated during the vanadium removal process of mineral oil, which includes titanium tetrachloride and carbon. The reducibility of carbon in the carbon-containing mud accounts for 30-50%, and the carbon can play a reducing role. In the actual production process of preparing titanium tetrachloride, in order to achieve the chlorination of titanium in titanium ore, carbon-containing reducing agents such as petroleum coke and coal are often used. By returning and adding carbon-containing mud to the chlorination furnace, it can produce the same effect (reducibility) as petroleum coke. In this way, the amount of petroleum coke used in the chlorination molten salt process is reduced, thereby reducing the production cost of the chlorination molten salt process and improving the yield of titanium chloride. In the actual reaction, due to the limitations of reaction conditions (such as uneven temperature distribution, insufficient contact of reactants, etc.), some reductants fail to participate in the reduction reaction. After the gas-solid separation and liquid washing processes after the chlorination reaction, the unreacted carbon-containing substances exist in the form of fine particles, mixed with other impurities, water, etc., and finally form carbon-containing mud. In the titanium tetrachloride preparation process, the molten salt chlorination reaction can promote the full reaction of titanium raw materials and chlorine gas to achieve efficient conversion, thereby obtaining high-purity titanium tetrachloride gas, providing qualified raw materials for subsequent titanium tetrachloride condensation, refining and other processes, and is a key step in the preparation of titanium tetrachloride.
[0025] Specifically, common reducing agents include petroleum coke, etc. Petroleum coke and titanium-containing oxides undergo chlorination reduction reaction in a chlorine atmosphere. Under high temperature conditions, carbon combines with oxygen in titanium oxides and is oxidized itself, reducing titanium from its oxides and combining with chlorine to form titanium tetrachloride. The process of petroleum coke as a reducing agent participating in the chlorination reduction reaction is as follows: TiO2+ 2Cl2+ C (petroleum coke) = TiCl4+ CO2 In addition to playing a reducing role in the entire molten salt chlorination reaction process, petroleum coke can also provide reaction heat to adjust material properties, such as improving the permeability and porosity of the material.
[0026] Specifically, since the carbon-containing mud contains carbon that can exert reducing properties, the amount of reducing agent actually added can be reduced by re-involving it in the molten salt chlorination reaction process. The method of re-involving the carbon-containing mud in the molten salt chlorination reaction process includes returning the carbon-containing mud to the chlorination furnace through a pipeline connected to the chlorination furnace. The flow rate of the carbon-containing mud returned to the chlorination furnace is adjusted according to the carbon content in the carbon-containing mud, and the flow rate of the reducing agent continuously added to the chlorination furnace is adjusted. As the carbon content in the carbon-containing mud increases, the flow rate of the carbon-containing mud returned to the chlorination furnace increases, and the flow rate of the reducing agent continuously added to the chlorination furnace is reduced.
[0027] The above-mentioned titanium tetrachloride slurry treatment method, by re-involving the carbon-containing slurry in the molten salt chlorination reaction process, on the one hand, recycles the carbon-containing slurry and improves the utilization value of the carbon-containing slurry; on the other hand, it fully utilizes the reducing property of carbon in the carbon-containing slurry, reduces the amount of reducing agent actually added, reduces the consumption of reducing agent, and saves the cost of industrial raw materials.
[0028] According to some embodiments of the present invention, re-participating in the molten salt chlorination reaction process includes: returning the carbon-containing slurry produced in the titanium tetrachloride preparation process to the chlorination furnace under the chlorine atmosphere through a pipeline, so that the carbon in the carbon-containing slurry reacts with the titanium-containing oxide in a molten salt chlorination reaction.
[0029] According to some embodiments of the present invention, the higher the carbon content in the carbon-containing mud, the higher the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process, and the corresponding amount of the reducing agent actually added to the molten salt chlorination reaction process per unit time. Reasonably adjust the relationship between the carbon content in the carbon-containing mud, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process, and the reducing agent actually added to the molten salt chlorination reaction process per unit time, accurately adjust the carbon content and flow rate in the carbon-containing mud, and make full use of its reducing properties, which can effectively reduce the amount of additional reducing agent added. For example, when the carbon content of the carbon-containing mud is high, appropriately increasing its flow rate can significantly reduce the use of reducing agents and cut raw material procurement costs while meeting the reaction requirements. If the carbon-containing mud is not used, it will become waste. By reasonably adjusting it and recycling it as a "natural" reducing agent, it can achieve secondary utilization of resources, reduce waste treatment costs, and improve overall resource utilization efficiency.
[0030] According to some embodiments of the present invention, the carbon content in the carbon-containing mud is greater than 0% and less than or equal to 1.4%. When the carbon content in the carbon-containing mud is within the range of greater than 0% and less than or equal to 1.4%, the carbon-containing mud is re-involved in the molten salt chlorination reaction process to recover the carbon in the carbon-containing mud, maximize the utilization rate of the carbon therein, avoid the problem of insufficient carbon utilization in the carbon-containing mud, and improve the utilization value of the carbon-containing mud.
[0031] According to several embodiments of the present invention, as the carbon content in the carbon-containing mud gradually increases within the range of greater than 0% and less than or equal to 1.4%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to gradually increase within the range of greater than 0 and less than or equal to 1.12 t / h, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is correspondingly adjusted to gradually decrease within the range of greater than 0 and less than or equal to 0.69 t.
[0032] According to several embodiments of the present invention, based on the carbon content of the carbon-containing mud being 0.8%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to 0.64 t / h, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is adjusted to 0.29~0.45 t.
[0033] According to several embodiments of the present invention, based on the carbon content in the carbon-containing mud being 1%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to 0.8t, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is adjusted to 0.19~0.39t.
[0034] According to several embodiments of the present invention, based on the carbon content in the carbon-containing mud being 1.2%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to 0.96t, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is adjusted to 0.09~0.33t.
[0035] According to several embodiments of the present invention, the reducing agent includes petroleum coke.
[0036] The carbon-containing mud is used as a supplementary reducing agent, and is connected to the feeding port on the top of the chlorination furnace through a pipeline. The weight of the mud is measured by a flow meter, so that the mass of the carbon-containing mud returned to the chlorination furnace is reasonably related to the mass of the carbon-containing reagent continuously added to the chlorination furnace, and the total mass of the two accounts for 30-50% of the total material. At the same time, the amount of reverse mud, the way of returning mud and the heat balance of the chlorination furnace reaction are coordinated according to the carbon content of different refined muds, so that the temperature in the chlorination furnace can ensure the normal chlorination reduction reaction, thereby realizing the recycling of carbon-containing mud on the one hand, improving the utilization value of carbon-containing mud, and on the other hand, making full use of the reducing property of carbon in carbon-containing mud, reducing the amount of reducing agent actually added, reducing the consumption of reducing agent, and saving the cost of industrial raw materials.
[0037] In order to further understand the titanium tetrachloride slurry treatment method provided by the present invention, it is described in detail in the following specific examples.
[0038] The carbon content in the carbon-containing mud is in the range of 0~1.4%, the mass of the carbon-containing mud returned to the chlorination furnace per unit time is 0~1.12t, and the mass of the carbon-containing reagent continuously added to the chlorination furnace per unit time is 0~0.69t. As the carbon content in the carbon-containing mud increases within the range of 0~1.4%, the mass of the carbon-containing mud returned to the chlorination furnace per unit time increases within 0~1.12t, and the mass of the reducing agent continuously added to the chlorination furnace per unit time is adjusted to decrease within the range of 0~0.69t. The carbon content of the carbon-containing mud is 0.5%, and the mass of the carbon-containing mud returned to the chlorination furnace per unit time is 0.4t, and the corresponding mass of the reducing agent continuously added to the chlorination furnace per unit time is adjusted to 0.44~0.55t; the carbon content of the carbon-containing mud is 0.8%, and the mass of the carbon-containing mud returned to the chlorination furnace per unit time is 0.64t, and the corresponding mass of the reducing agent continuously added to the chlorination furnace per unit time is adjusted to 0.29~0.45t; the carbon content of the carbon-containing mud is 1%, and the mass of the carbon-containing mud returned to the chlorination furnace per unit time is 0. 8t, corresponding to the mass of the reducing agent continuously added to the chlorination furnace per unit time being adjusted to 0.19~0.39t; the carbon content in the carbon-containing mud is 1.2%, the mass of the carbon-containing mud returned to the chlorination furnace per unit time is 0.96t, corresponding to the mass of the reducing agent continuously added to the chlorination furnace per unit time being adjusted to 0.09~0.33t; the carbon content in the carbon-containing mud is 1.4%, the mass of the carbon-containing mud returned to the chlorination furnace per unit time is 1.12t, corresponding to the mass of the reducing agent continuously added to the chlorination furnace per unit time being adjusted to 0~0.27t. The specific relationship between the carbon content in the carbon-containing mud, the mass of the carbon-containing mud returned to the chlorination furnace per unit time, and the mass of the carbon-containing reagent continuously added to the chlorination furnace per unit time is shown in Table 1 below: Table 1
[0039] It can be seen from Table 1 that when the carbon content in the carbon-containing mud is within a reasonable range, that is, within the range of 0~1.4% (greater than 0% and less than or equal to 1.4%), the carbon content in the carbon-containing mud is positively correlated with the mass of the carbon-containing mud returned to the chlorination furnace per unit time, and negatively correlated with the mass of the carbon-containing reagent continuously added to the chlorination furnace per unit time. When the carbon content of the carbon-containing mud gradually increases from greater than 0 to 1.4%, the mass of the returned mud per unit time also gradually increases until it reaches 1.12t, and the mass of the reducing agent continuously added to the chlorination furnace per unit time decreases from 0.69t to 0~0.27t. When the carbon content in the carbon-containing mud exceeds 1.4% and further increases, even if the mass of the carbon-containing mud returned to the chlorination furnace per unit time gradually increases, the mass of the carbon-containing reagent continuously added to the chlorination furnace per unit time does not decrease significantly, indicating that with the further increase of the carbon content in the carbon-containing mud, the molten salt chlorination reaction is close to equilibrium and the carbon utilization rate in the carbon-containing mud decreases. Since returning the carbon-containing slurry to the chlorination furnace will affect the temperature of the chlorination furnace, and the molten salt chlorination reaction is an exothermic reaction, the increase in carbon content will further promote the exothermic reaction of the molten salt chlorination reaction, and the excess heat released will cause more metal components other than titanium in the titanium ore to be chlorinated, generating impurities such as ferric chloride and aluminum chloride into the product titanium tetrachloride. Therefore, it is necessary to reasonably adjust the amount of returned slurry per unit time and the feed amount of carbon-containing reagent per unit time according to the carbon content of different carbon-containing slurries, and not to blindly increase the amount of returned slurry per unit time.
[0040] According to a second aspect of the present invention, a method for preparing titanium tetrachloride is also provided, comprising: adding a reducing agent and a titanium-containing oxide into a chlorination furnace to carry out a molten salt chlorination reaction, and obtaining a carbon-containing slurry produced during the reaction; and a titanium tetrachloride slurry treatment method as described in any of the above items to prepare titanium tetrachloride.
[0041] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.
[0042] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.
Claims
1. A titanium tetrachloride slurry treatment method, characterized in that: include: The carbon-containing slurry generated in the titanium tetrachloride preparation process is re-involved in the molten salt chlorination reaction process, and the reducing property of carbon in the carbon-containing slurry is utilized, wherein the flow rate of the carbon-containing slurry re-involved in the molten salt chlorination reaction process is adjusted to reduce the amount of reducing agent actually added to the molten salt chlorination reaction process.
2. The titanium tetrachloride slurry treatment method according to claim 1, characterized in that: The re-participation in the molten salt chlorination reaction process includes: The carbon-containing slurry produced in the titanium tetrachloride preparation process is returned to the chlorination furnace under the chlorine atmosphere through a pipeline, so that the carbon in the carbon-containing slurry reacts with the titanium-containing oxide in a molten salt chlorination reaction.
3. The titanium tetrachloride slurry treatment method according to claim 1, characterized in that: As the carbon content in the carbonaceous mud increases, the flow rate of the carbonaceous mud re-participating in the molten salt chlorination reaction process is increased, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is correspondingly reduced.
4. The titanium tetrachloride slurry treatment method according to claim 3, characterized in that: The carbon content in the carbonaceous mud is greater than 0% and less than or equal to 1.4%.
5. The titanium tetrachloride slurry treatment method according to claim 4, characterized in that: According to the carbon content in the carbon-containing mud gradually increasing within the range of greater than 0% and less than or equal to 1.4%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to gradually increase within the range of greater than 0 and less than or equal to 1.12 t / h, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is correspondingly adjusted to gradually decrease within the range of greater than 0 and less than or equal to 0.69 t.
6. The titanium tetrachloride slurry treatment method according to claim 5, characterized in that: According to the carbon content of the carbon-containing mud being 0.8%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to 0.64 t / h, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is correspondingly adjusted to 0.29~0.45 t.
7. The titanium tetrachloride slurry treatment method according to claim 6, characterized in that: According to the carbon content of the carbon-containing mud being 1%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to 0.8t, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is correspondingly adjusted to 0.19~0.39t.
8. The titanium tetrachloride slurry treatment method according to claim 7, characterized in that: According to the carbon content of the carbon-containing mud being 1.2%, the flow rate of the carbon-containing mud re-participating in the molten salt chlorination reaction process is adjusted to 0.96t, and the amount of reducing agent actually added to the molten salt chlorination reaction process per unit time is correspondingly adjusted to 0.09-0.33t.
9. The titanium tetrachloride slurry treatment method according to claim 1, characterized in that: The reducing agent includes petroleum coke.
10. A method for preparing titanium tetrachloride, characterized in that: include: Adding a reducing agent and titanium-containing oxide into a chlorination furnace to generate a molten salt chlorination reaction, and obtaining carbon-containing mud generated during the reaction; And a titanium tetrachloride slurry treatment method as described in any one of claims 1 to 9 to prepare titanium tetrachloride.