A method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination method

Abstract

The present invention relates to a method for treating iron-rich tail mud produced in the preparation of titanium tetrachloride by the chlorination method of ilmenite. The method includes: W1. Based on the historical data information of the output and treatment amount of the iron-rich tail mud, obtaining the aging days data information of the iron-rich tail mud, and constructing a prediction model for the treatment grade of the iron-rich tail mud to predict the treatment grade of the iron-rich tail mud, so as to obtain the iron-rich tail mud with the predicted treatment grade; W2. Based on the iron-rich tail mud with the predicted treatment grade, successively performing the treatments of water washing, drying, dispersing and screening to obtain the treated iron-rich tail mud with the predicted treatment grade. The present invention can not only make full use of the iron-rich tail mud in a resourceful way, but also perform hierarchical treatment according to the different aging times of the iron-rich tail mud, and adopt the optimized acid leaching treatment to increase the content of Fe2O3 or TFe in the iron-rich tail mud, so as to meet the application requirements of iron concentrate powder.

Description

Technical Field

[0001] The invention relates to the technical field of iron-rich tailings treatment, and in particular to a method for treating iron-rich tailings produced by preparing titanium tetrachloride through a chlorination process of ilmenite. Background Art

[0002] The production process of titanium dioxide by the chloride process is a relatively efficient and environmentally friendly process. It uses titanium-rich materials (high-titanium slag or rutile) and petroleum coke in a chlorination furnace to react in a chlorine environment to generate crude titanium tetrachloride gas, which is then converted into refined titanium tetrachloride through condensation and refining. The process technology of the titanium dioxide industry by the chloride process has gradually become the international mainstream production process, with advantages such as short process flow, high product quality and low environmental damage.

[0003] The raw materials used in the chlorination method are mostly high-titanium raw materials with a titanium content of more than 90%, so less tailings are produced. However, high-quality high-titanium resources are becoming less and less, and the cost of raw materials is getting higher and higher. Ilmenite is the most common titanium-containing mineral. It contains about 50% titanium dioxide and is also an important source of iron. At present, titanium tetrachloride is prepared by the chlorination method using ilmenite as a raw material. However, a large amount of iron elements exist in the form of acid-containing ferrous chloride. After neutralization with limestone, it is filtered to form iron-rich tailings, which also contain residues of raw materials such as titanium and calcium. For every ton of titanium tetrachloride produced, 1-2 tons of iron-rich tailings and a large amount of waste hydrochloric acid will be produced, and the amount of iron-rich tailings produced per day far exceeds the amount of iron-rich tailings processed per day.

[0004] At present, iron-rich tailings are stored in the form of piles and naturally dried without subsequent treatment. While occupying land, it causes certain harm to the environment. At the same time, there is an aging phenomenon, and it is difficult to react with acid. How to purify the iron in the iron-rich tailings through acid leaching treatment, how to utilize the iron-rich tailings as resources, and how to achieve balanced treatment and improve process efficiency due to the different aging times of the iron-rich tailings have become issues that we urgently need to solve. Summary of the invention

[0005] In view of the above problems, the present invention provides a method for treating iron-rich tailings produced by preparing titanium tetrachloride by the ilmenite chlorination process, which can not only make full use of the iron-rich tailings as resources, but also carry out graded treatment according to the different aging times of the iron-rich tailings, and use optimized acid leaching treatment to increase the content of Fe2O3 or TFe in the iron-rich tailings so that it can meet the application requirements of iron ore concentrate.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the technical solution provided by the present invention is as follows:

[0007] A method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination method, the method comprising:

[0008] W1. Based on the historical data information of the output and treatment volume of the iron-rich tailings, obtain the data information of the aging days of the iron-rich tailings, and construct a prediction model for the treatment grade of the iron-rich tailings, predict the treatment grade of the iron-rich tailings, and obtain the predicted treatment grade of the iron-rich tailings;

[0009] W2. Based on the predicted treatment level of the iron-rich tailings, sequentially washed, dried, broken up and sieved to obtain the treated iron-rich tailings of the predicted treatment level;

[0010] W3. The iron-rich tailings of the predicted grade after the treatment are subjected to acid leaching treatment, and an acid leaching optimization treatment model is established to optimize the hydrochloric acid solubility, the ratio of powder / acid solution, and the reaction temperature to obtain the iron-rich tailings after acid leaching treatment;

[0011] W4. The iron-rich tailings after the acid leaching treatment are filtered, precipitated, filter-pressed and calcined in sequence to obtain iron concentrate and complete the treatment.

[0012] Furthermore, in step W1, the construction of the treatment grade prediction model of the iron-rich tailings mud and the prediction of the treatment grade of the iron-rich tailings mud include:

[0013] W11. Based on the aging days data information of the iron-rich tailings, a processing grade division function P of the iron-rich tailings is established,

[0014] ,

[0015] Wherein, x is the aging days data information of the iron-rich tailings, and the treatment grade of the iron-rich tailings is divided to obtain the treatment grade division data information of the iron-rich tailings;

[0016] W12. Based on the data information of the treatment grade classification of the iron-rich tailings, a prediction function Q for the treatment grade of the iron-rich tailings is established.

[0017] ,

[0018] Among them, x i is the number of days of aging of iron-rich tailings for i days, y is the data of the treatment grade of iron-rich tailings, α i is the corresponding weight coefficient, ω1, ω2 and ω3 are the prediction adaptability factors;

[0019] W13. Based on the processing grade prediction function Q of the iron-rich tailings, the processing grade of the iron-rich tailings is predicted to obtain the iron-rich tailings of the predicted processing grade.

[0020] Furthermore, the constraints of the predicted adaptability factors ω1, ω2 and ω3 are:

[0021] .

[0022] Furthermore, in step W2, the water washing is to mix the iron-rich tailings of the predicted treatment grade and clean water in a mass ratio of 1: (4-6), and fully stir for 16-20 minutes to allow the soluble matter in the iron-rich tailings of the predicted treatment grade to be fully dissolved (the soluble matter is mainly calcium chloride, which can be used as a by-product raw material), the room temperature is 18-23°C, the stirred suspension is settled for 3-5 hours, the supernatant is poured out, the water content of the suspension is controlled at 50%-60%, and the water washing step is repeated at least 5 times; the drying is to dry the iron-rich tailings suspension after water washing, and the drying temperature is 60-70°C.

[0023] Furthermore, in step W2, the dispersing is to use a high-speed dispersing machine to disperse the iron-rich tailings after washing and drying, and the main engine speed is 160-200r / min; the screening is to use a 180-220 mesh sieve to screen the dispersed powder, and the sieved powder enters step W3, and the remaining particles are used as titanium-rich raw materials and reused as raw materials for titanium tetrachloride.

[0024] Further, in step W3, the establishment of an acid leaching optimization treatment model to optimize the hydrochloric acid solubility, the ratio of powder / acid solution, and the reaction temperature includes:

[0025] W31. Based on the predicted level of the treated iron-rich tailings, a data set of iron-rich tailings with different predicted levels is established, which is divided into a training set and a test set;

[0026] W32. Input the training set into the acid leaching optimization model for training and learning, and determine the acid leaching optimization function G,

[0027] ,

[0028] Among them, z is the training set, a is the solubility of hydrochloric acid, b is the powder / acid solution, c is the reaction temperature, ρ1 is the hydrochloric acid concentration adjustment factor, ρ2 is the control parameter of the powder / acid solution, and ρ3 is the determining factor of the reaction temperature, and the trained acid leaching optimization treatment model is obtained;

[0029] W33. Based on the trained acid leaching optimization model, the test set is input to obtain the optimized hydrochloric acid solubility, powder / acid solution ratio, and reaction temperature data information.

[0030] Furthermore, the hydrochloric acid in the hydrochloric acid solution is waste hydrochloric acid produced by preparing titanium tetrachloride using a chlorination process, and the mass fraction of the hydrochloric acid is 37%-40%.

[0031] Furthermore, in step W4, the filtration is performed by centrifugal sedimentation for suspensions with a pH value less than or equal to 3, and by filter pressing for suspensions with a pH value greater than or equal to 3. The solid particles separated by filtration are used as titanium-rich raw materials and reused as raw materials for titanium tetrachloride.

[0032] Furthermore, the precipitation is to add ammonia water to the filtrate to obtain iron hydroxide precipitate and ammonium chloride solution, wherein the ammonia water is slowly added to the filtrate while stirring, and the pH is controlled to be 5; the pressure filtration is to have a water content of the iron hydroxide mud less than 20% after the pressure filtration, and the ammonium chloride solution is used as a by-product raw material.

[0033] Furthermore, the calcination is to calcine the iron hydroxide mud after pressure filtration in an air atmosphere, the calcination temperature is 550-700° C., the insulation time is 0.8-2 hours, and iron concentrate is obtained after calcination.

[0034] The present invention has the following positive effects:

[0035] 1. The present invention predicts the treatment grade of iron-rich tailings by constructing a treatment grade prediction model for iron-rich tailings, and optimizes the solubility of hydrochloric acid, the ratio of powder / acid solution, and the reaction temperature in combination with the establishment of an acid leaching optimization treatment model. It can not only fully utilize the iron-rich tailings as resources, but also carry out graded treatment according to the different aging times of the iron-rich tailings, and adopt the optimized acid leaching treatment to reduce energy consumption and increase the output of iron concentrate. At the same time, it can balance the iron-rich tailings and improve the process treatment efficiency of the iron-rich ore mud.

[0036] 2. The present invention realizes the resource utilization of solid waste and converts iron-rich tailings into iron concentrate. At the same time, the by-products of the process, such as titanium-rich raw materials and ammonium chloride, are recycled and utilized, and the by-product of the chlorination method, hydrochloric acid waste acid, is consumed. At the same time, the iron-rich tailings are treated by this process flow, and the Fe2O3 content is increased from 60% to more than 90%, and TFe is ≥ 63%, which meets its application demand as iron concentrate (the processed iron ore concentrate is defined as: TFe: 63% to 70.5% is ordinary powder, and more than 70.5% is super powder).

[0037] 3. The present invention treats the iron-rich ore mud by acid leaching, filtration, precipitation, filter pressing, etc. During the treatment process, not only can the waste hydrochloric acid be fully utilized to reduce the waste of resources, but also raw materials such as titanium, calcium and ammonia can be recycled and reused, further reducing the waste of energy, improving production costs, and facilitating the promotion of industrialization. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the method flow of the present invention;

[0039] Figure 2It is a schematic flow chart of the treatment grade prediction model of the iron-rich tailings of the present invention;

[0040] Figure 3 The figure is a schematic diagram of the process of establishing the acid leaching optimization treatment model of the present invention. DETAILED DESCRIPTION

[0041] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0042] Example 1: Figure 1 As shown, a method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination method, the method comprising:

[0043] W1. Based on the historical data information of the output and treatment volume of the iron-rich tailings, obtain the data information of the aging days of the iron-rich tailings, and construct a prediction model for the treatment grade of the iron-rich tailings, predict the treatment grade of the iron-rich tailings, and obtain the predicted treatment grade of the iron-rich tailings;

[0044] W2. Based on the predicted treatment level of the iron-rich tailings, sequentially washed, dried, broken up and sieved to obtain the treated iron-rich tailings of the predicted treatment level;

[0045] W3. The iron-rich tailings of the predicted grade after the treatment are subjected to acid leaching treatment, and an acid leaching optimization treatment model is established to optimize the hydrochloric acid solubility, the ratio of powder / acid solution, and the reaction temperature to obtain the iron-rich tailings after acid leaching treatment;

[0046] W4. The iron-rich tailings after the acid leaching treatment are filtered, precipitated, filter-pressed and calcined in sequence to obtain iron concentrate and complete the treatment.

[0047] In this embodiment, if Figure 2 As shown, in step W1, the processing grade prediction model of the iron-rich tailings is constructed, and the processing grade prediction of the iron-rich tailings is predicted, including:

[0048] W11. Based on the aging days data information of the iron-rich tailings, a processing grade division function P of the iron-rich tailings is established,

[0049] ,

[0050] Wherein, x is the aging days data information of the iron-rich tailings, and the treatment grade of the iron-rich tailings is divided to obtain the treatment grade division data information of the iron-rich tailings;

[0051] W12. Based on the data information of the treatment grade classification of the iron-rich tailings, a prediction function Q for the treatment grade of the iron-rich tailings is established.

[0052] ,

[0053] Among them, x i is the number of days of aging of iron-rich tailings for i days, y is the data of the treatment grade of iron-rich tailings, α i is the corresponding weight coefficient, ω1, ω2 and ω3 are the prediction adaptability factors;

[0054] W13. Based on the processing grade prediction function Q of the iron-rich tailings, the processing grade of the iron-rich tailings is predicted to obtain the iron-rich tailings of the predicted processing grade.

[0055] In this embodiment, the constraints of the prediction adaptability factors ω1, ω2 and ω3 are:

[0056] .

[0057] In this embodiment, in step W2, the water washing is to mix the iron-rich tailings of the predicted treatment grade and clean water in a mass ratio of 1: (4-6), fully stirring for 16-20 minutes to allow the soluble substances in the iron-rich tailings of the predicted treatment grade to be fully dissolved, the room temperature is 18-23°C, the stirred suspension is settled for 3-5 hours, the supernatant is poured out, the water content of the suspension is controlled at 50%-60%, and this water washing step is repeated at least 5 times; the drying is to dry the iron-rich tailings suspension after water washing, and the drying temperature is 60-70°C.

[0058] In this embodiment, in step W2, the dispersing is to use a high-speed dispersing machine to disperse the iron-rich tailings after washing and drying, and the main engine speed is 160-200r / min; the screening is to use a 180-220 mesh sieve to screen the dispersed powder, and the sieved powder enters step W3, and the remaining particles are used as titanium-rich raw materials and reused as raw materials for titanium tetrachloride.

[0059] In this embodiment, if Figure 3 As shown, in step W3, the establishment of an acid leaching optimization treatment model to optimize the hydrochloric acid solubility, the ratio of powder / acid solution, and the reaction temperature includes:

[0060] W31. Based on the predicted level of the treated iron-rich tailings, a data set of iron-rich tailings with different predicted levels is established, which is divided into a training set and a test set;

[0061] W32. Input the training set into the acid leaching optimization model for training and learning, and determine the acid leaching optimization function G,

[0062] ,

[0063] Among them, z is the training set, a is the solubility of hydrochloric acid, b is the powder / acid solution, c is the reaction temperature, ρ1 is the hydrochloric acid concentration adjustment factor, ρ2 is the control parameter of the powder / acid solution, and ρ3 is the determining factor of the reaction temperature, and the trained acid leaching optimization treatment model is obtained;

[0064] W33. Based on the trained acid leaching optimization model, the test set is input to obtain the optimized hydrochloric acid solubility, powder / acid solution ratio, and reaction temperature data information.

[0065] In this embodiment, the hydrochloric acid in the hydrochloric acid solution is waste hydrochloric acid produced by preparing titanium tetrachloride using a chlorination process, and the mass fraction of the hydrochloric acid is 37%-40%.

[0066] In this embodiment, in step W4, the filtration is performed by centrifugal sedimentation for suspensions with a pH value less than or equal to 3, and by filter pressing for suspensions with a pH value greater than or equal to 3. The solid particles separated by filtration are used as titanium-rich raw materials and reused as raw materials for titanium tetrachloride.

[0067] In this embodiment, the precipitation is to add ammonia water to the filtrate to obtain iron hydroxide precipitate and ammonium chloride solution, wherein the ammonia water is slowly added to the filtrate while stirring to control the pH=5; the pressure filtration is to obtain a water content of the iron hydroxide mud of less than 20% after the pressure filtration, and the ammonium chloride solution is used as a by-product raw material.

[0068] In this embodiment, the calcination is to calcine the iron hydroxide mud after pressure filtration in an air atmosphere, the calcination temperature is 550-700° C., the insulation time is 0.8-2 hours, and iron concentrate is obtained after calcination.

[0069] Example 2: Based on the method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination process in Example 1, the present invention is further illustrated and described below.

[0070] like Figure 1 As shown, a method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination method, the method comprising:

[0071] W1. Based on the historical data information of the output and treatment volume of the iron-rich tailings, obtain the data information of the aging days of the iron-rich tailings, and construct a prediction model for the treatment grade of the iron-rich tailings, predict the treatment grade of the iron-rich tailings, and obtain the predicted treatment grade of the iron-rich tailings;

[0072] W2. Based on the predicted treatment level of the iron-rich tailings, sequentially washed, dried, broken up and sieved to obtain the treated iron-rich tailings of the predicted treatment level;

[0073] W3. The iron-rich tailings of the predicted grade after the treatment are subjected to acid leaching treatment, and an acid leaching optimization treatment model is established to optimize the hydrochloric acid solubility, the ratio of powder / acid solution, and the reaction temperature to obtain the iron-rich tailings after acid leaching treatment;

[0074] W4. The iron-rich tailings after the acid leaching treatment are filtered, precipitated, filter-pressed and calcined in sequence to obtain iron concentrate and complete the treatment.

[0075] In this embodiment, water washing: the iron-rich tailings and clean water are mixed in a mass ratio of 1:5, and stirred for 15 minutes to allow the soluble substances in the iron-rich tailings to be fully dissolved. The stirred suspension is settled for 4 hours at room temperature of 20°C, and the supernatant is poured out. The water content of the suspension is controlled at 50%-60%, and this water washing step is repeated 5 times;

[0076] In this embodiment, drying: drying the iron-rich tailings suspension after washing at a temperature of 60-70°C;

[0077] In this embodiment, the tail mud after washing and drying is dispersed by using a high-speed disperser, and the main engine speed is 180 (r / min);

[0078] In this embodiment, screening: using a 200-mesh sieve to screen the powder after the powder is dispersed, the powder after the screened enters the next process, and the remaining particles are used as titanium-rich raw materials and reused as raw materials for titanium tetrachloride;

[0079] In this embodiment, acid leaching: according to the different grades of iron-rich tailings, waste hydrochloric acid produced by preparing titanium tetrachloride by chlorination method is used, and the iron hydroxide is dissolved by controlling the solubility of hydrochloric acid, the ratio of powder / acid solution, and the reaction temperature, while other substances that are not easily soluble in acid exist in the form of solid particles;

[0080] Table 1 Acid leaching process parameters

[0081]

[0082] According to the acid leaching process parameters in the above table, for every ton of iron-rich tailings, 0.53 tons of iron concentrate is recovered, as well as 0.28 tons of titanium-rich raw materials, 0.19 tons of calcium salt and other raw materials. The content of Fe2O3 in the iron concentrate is about 92.25%.

[0083] Although it is very common to use acid leaching process to pre-treat ore raw materials, conventional means are to completely dissolve the raw materials, while this technology partially dissolves the tailing mud to achieve the purpose of purification. The innovation of this application is to selectively dissolve the iron hydroxide in the tailing mud by utilizing the difference in acid leaching dissolution rate after aging of iron hydroxide, so as to achieve the purpose of purification.

[0084] In this embodiment, precipitation: adding ammonia water to the filtrate to obtain iron hydroxide precipitate and ammonium chloride solution, slowly adding ammonia water to the filtrate, stirring while adding, and controlling the pH to 5;

[0085] In this embodiment, filtration: filtration is performed by filter pressing, the iron hydroxide precipitate enters the next process, and the ammonium chloride solution is further processed as a by-product raw material. The water content of the iron hydroxide mud after filter pressing is less than 20%;

[0086] In this embodiment, calcination: the iron hydroxide mud after pressure filtration is calcined in air atmosphere at a calcination temperature of 600° C. for 1 hour. After calcination, iron concentrate is obtained and applied to the steel metallurgical industry.

[0087] In summary, the present invention can not only fully utilize the iron-rich tailings as resources, but also perform graded treatment according to the different aging times of the iron-rich tailings, and use optimized acid leaching treatment to increase the content of Fe2O3 or TFe in the iron-rich tailings so that it can meet the application requirements of iron ore concentrate.

[0088] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination process, characterized in that: The method comprises: W1. Based on the historical data information of the output and treatment volume of the iron-rich tailings, obtain the data information of the aging days of the iron-rich tailings, and construct a prediction model for the treatment grade of the iron-rich tailings, predict the treatment grade of the iron-rich tailings, and obtain the predicted treatment grade of the iron-rich tailings; W2. Based on the predicted treatment level of the iron-rich tailings, sequentially washed, dried, broken up and sieved to obtain the treated iron-rich tailings of the predicted treatment level; W3. The iron-rich tailings of the predicted grade after the treatment are subjected to acid leaching treatment, and an acid leaching optimization treatment model is established to optimize the hydrochloric acid solubility, the ratio of powder / acid solution, and the reaction temperature to obtain the iron-rich tailings after acid leaching treatment; W4. The iron-rich tailings after the acid leaching treatment are filtered, precipitated, filtered and calcined in sequence to obtain iron concentrate to complete the treatment; In step W1, the process of constructing a prediction model for the treatment grade of the iron-rich tailings to predict the treatment grade of the iron-rich tailings includes: W11. Based on the aging days data information of the iron-rich tailings, a processing grade division function P of the iron-rich tailings is established, ， Wherein, x is the aging days data information of the iron-rich tailings, and the treatment grade of the iron-rich tailings is divided to obtain the treatment grade division data information of the iron-rich tailings; W12. Based on the data information of the treatment grade classification of the iron-rich tailings, a prediction function Q for the treatment grade of the iron-rich tailings is established. ， Among them, x i is the number of days of aging of iron-rich tailings for i days, y is the data of the treatment grade of iron-rich tailings, α i is the corresponding weight coefficient, ω1, ω2 and ω3 are the prediction adaptability factors; W13. Based on the processing grade prediction function Q of the iron-rich tailings, the processing grade of the iron-rich tailings is predicted to obtain the predicted processing grade of the iron-rich tailings; The constraints of the prediction adaptability factors ω1, ω2 and ω3 are, ， In step W3, the establishment of an acid leaching optimization treatment model to optimize the hydrochloric acid solubility, the ratio of powder / acid solution, and the reaction temperature includes: W31. Based on the predicted level of the treated iron-rich tailings, a data set of iron-rich tailings with different predicted levels is established, which is divided into a training set and a test set; W32. Input the training set into the acid leaching optimization model for training and learning, and determine the acid leaching optimization function G, ， Among them, z is the training set, a is the solubility of hydrochloric acid, b is the powder / acid solution, c is the reaction temperature, ρ1 is the hydrochloric acid concentration adjustment factor, ρ2 is the control parameter of the powder / acid solution, and ρ3 is the determining factor of the reaction temperature, and the trained acid leaching optimization treatment model is obtained; W33. Based on the trained acid leaching optimization model, the test set is input to obtain the optimized hydrochloric acid solubility, powder / acid solution ratio, and reaction temperature data information.

2. The method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination process according to claim 1, characterized in that: In step W2, the water washing is to mix the iron-rich tailings of the predicted treatment grade and clean water in a mass ratio of 1: (4-6), fully stir for 16-20 minutes to allow the soluble substances in the iron-rich tailings of the predicted treatment grade to be fully dissolved, the room temperature is 18-23°C, the stirred suspension is settled for 3-5 hours, the supernatant is poured out, the water content of the suspension is controlled at 50%-60%, and this water washing step is repeated at least 5 times; the drying is to dry the iron-rich tailings suspension after water washing, and the drying temperature is 60-70°C.

3. The method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination process according to claim 1, characterized in that: In step W2, the dispersing is to use a high-speed dispersing machine to disperse the iron-rich tailings after washing and drying, and the main engine speed is 160-200r / min; the screening is to use a 180-220 mesh sieve to screen the dispersed powder, and the sieved powder enters step W3, and the remaining particles are used as titanium-rich raw materials and reused as raw materials for titanium tetrachloride.

4. The method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination process according to claim 1, characterized in that: The hydrochloric acid in the hydrochloric acid solution is waste hydrochloric acid produced by preparing titanium tetrachloride using a chlorination process, and the mass fraction of the hydrochloric acid is 37%-40%.

5. The method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination process according to claim 1, characterized in that: In step W4, the filtration is performed by centrifugal sedimentation for suspensions with a pH value less than or equal to 3, and by filter pressing for suspensions with a pH value greater than or equal to 3. The solid particles separated by filtration are used as titanium-rich raw materials and reused as raw materials for titanium tetrachloride.

6. The method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination process according to claim 1, characterized in that: The precipitation is to add ammonia water to the filtrate to obtain iron hydroxide precipitate and ammonium chloride solution, wherein the ammonia water is slowly added to the filtrate while stirring, and the pH is controlled to be 5; the pressure filtration is to obtain a water content of the iron hydroxide mud of less than 20% after the pressure filtration, and the ammonium chloride solution is used as a by-product raw material.

7. The method for treating iron-rich tailings produced by preparing titanium tetrachloride by ilmenite chlorination process according to claim 1, characterized in that: The calcination is to calcine the iron hydroxide mud after pressure filtration in an air atmosphere, the calcination temperature is 550-700° C., the heat preservation time is 0.8-2 hours, and iron concentrate is obtained after calcination.

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