Method for determining reduction parameters of a titanium concentrate pre-reduction process

Abstract

The present application relates to the field of titanium concentrate pre-reduction, and in particular to a method for determining reduction parameters of a titanium concentrate pre-reduction process.A method for determining reduction parameters of a titanium concentrate pre-reduction process, comprising the following steps: (a) calculating the FeO content in the finished reduced titanium according to the target metal conversion rate and the ingredient content of the titanium concentrate; (b) calculating the discharge temperature and the exhaust temperature according to the target metal conversion rate; (c) calculating the coal addition amount according to the discharge temperature, the exhaust temperature and the target metal conversion rate; (e) calculating the air supplement amount according to the coal addition amount.The method can flexibly adjust the reduction parameters according to different requirements of the metal conversion rate, has low cost and high reduction rate.

Description

Technical Field

[0001] This invention relates to the field of titanium concentrate pre-reduction, and more specifically, to a method for determining reduction parameters in a titanium concentrate pre-reduction process. Background Technology

[0002] To improve current titanium slag smelting processes, stabilize electric furnace operation, increase production efficiency, reduce power consumption, and seek inexpensive and effective technologies to process low-grade titanium materials and reduce production costs, extensive research has been conducted on titanium slag smelting methods. Regarding enhancing iron oxide reduction, the most important approach is to directly feed titanium concentrate into the furnace after pelletizing or pelletizing, or to pre-oxidize / pre-reduce it before smelting in the electric furnace.

[0003] In the titanium concentrate pre-reduction process, the setting of certain reduction parameters is crucial to the smooth operation of the entire process and the achievement of the expected pre-reduction effect. If the reduction parameters are not set appropriately, it will not only affect the overall pre-reduction process but also cause a series of problems such as high cost and large coal consumption. During the implementation of the titanium concentrate pre-reduction process, the target metal conversion rate is adjusted according to actual needs. To achieve the target metal conversion rate, the relevant reduction parameters also need to be adjusted accordingly to meet actual production requirements. However, existing technologies do not disclose a complete method for designing reduction parameters, resulting in cumbersome methods for setting reduction parameters in actual implementation, unreasonable parameter settings, and other problems affecting the pre-reduction effect.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] One aspect of the present invention relates to a method for determining reduction parameters in a titanium concentrate pre-reduction process, comprising the following steps:

[0006] (a) Calculate the FeO content in the finished reduced titanium based on the target metal conversion rate and the composition content of the titanium concentrate;

[0007] (b) Calculate the discharge temperature and exhaust temperature based on the target metal conversion rate;

[0008] (c) Calculate the amount of coal to be added based on the discharge temperature, the exhaust temperature and the target metal conversion rate;

[0009] (e) Calculate the make-up air volume based on the amount of coal added.

[0010] The method described herein allows for flexible adjustment of reduction parameters based on different metal conversion requirements, resulting in low cost and high reduction rate.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] The method for determining reduction parameters in the titanium concentrate pre-reduction process provided by this invention allows for flexible adjustment of reduction parameters, such as discharge temperature, exhaust temperature, coal feed rate, and make-up air rate, according to different metal conversion requirements. By accurately calculating and controlling the reduction parameters, resource waste caused by unsuitable reduction parameters can be avoided, and the cost of pre-reduction can be reduced. The reduction parameters determined by this method result in a high reduction rate and a high metal conversion rate, ensuring stable operation of the pre-reduction system. Detailed Implementation

[0013] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0014] One aspect of the present invention also relates to a method for determining reduction parameters in a titanium concentrate pre-reduction process, comprising the following steps:

[0015] (a) Calculate the FeO content in the finished reduced titanium based on the target metal conversion rate and the composition content of the titanium concentrate;

[0016] (b) Calculate the discharge temperature and exhaust temperature based on the target metal conversion rate;

[0017] (c) Calculate the amount of coal to be added based on the discharge temperature, the exhaust temperature and the target metal conversion rate;

[0018] (e) Calculate the make-up air volume based on the amount of coal added.

[0019] The method for determining reduction parameters in the titanium concentrate pre-reduction process allows for flexible adjustment of reduction parameters, such as discharge temperature, exhaust temperature, coal feed rate, and make-up air rate, based on different metal conversion requirements. Precise calculations and control of reduction parameters prevent resource waste caused by unsuitable reduction parameters, reduce pre-reduction costs, and achieve high reduction and metal conversion rates using the reduction parameters determined by this method, ensuring stable operation of the pre-reduction system.

[0020] Preferably, the target metal conversion rate is 20% to 95% (e.g., 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 95%). The method of the present invention is not limited to the above target metal conversion rates; the method of the present invention can determine the reduction parameters for any metal conversion rate.

[0021] Preferably, the formula for calculating the FeO content in the finished reduced titanium is as follows:

[0022]

[0023] Where, m a The mass of FeO in the reduced titanium of the finished product; m 矿 The mass of the reduced titanium product is denoted as ; k is the mineral ratio of the reduced titanium product.

[0024] Preferably, the formula for calculating the mass of FeO in the finished reduced titanium is as follows:

[0025] m a =m b ×(100-η)%÷56×72;

[0026] Where, m a The mass of FeO in the reduced titanium of the finished product; m b η represents the mass of TFe in the titanium concentrate (TFe is the mass of iron oxide minus the mass of oxygen, and this meaning is used throughout the text); η represents the target metal conversion rate.

[0027] Preferably, the formula for calculating the ore ratio of the reduced titanium in the finished product is as follows:

[0028]

[0029] Where k is the ore ratio of the reduced titanium in the finished product; Δm is the mass loss of the pre-reduction process. Preferably, the formula for calculating the mass loss of the pre-reduction process is as follows:

[0030] Δm=m c +m d -mb×η-m a ;

[0031] Where Δm is the mass loss of the pre-reduction process; m c m is the mass of FeO in the titanium concentrate; d m is the mass of Fe2O3 in the titanium concentrate; b The mass of TFe in the titanium concentrate; η is the target metal conversion rate; m a The mass of FeO in the reduced titanium of the finished product.

[0032] Preferably, the formula for calculating the discharge temperature based on the target metal conversion rate is as follows:

[0033]

[0034] Where Ts is the discharge temperature; η is the target metal conversion rate.

[0035] Preferably, the formula for calculating the exhaust temperature based on the target metal conversion rate is as follows:

[0036]

[0037] Where Tg is the exhaust temperature; η is the target metal conversion rate.

[0038] Preferably, the formula for calculating the amount of coal added is as follows:

[0039]

[0040] Where, m 加煤量 m2 is the amount of coal added; m2 is the amount of coal required for the pre-reduction of titanium concentrate; ΔQ is the amount of heat required to supplement the pre-reduction process of titanium concentrate; the calorific value of coal is 7450 kcal / kg.

[0041] Preferably, the formula for calculating the amount of coal required for the pre-reduction of the titanium concentrate is as follows:

[0042]

[0043] Wherein, m2 is the amount of coal required for the pre-reduction of the titanium concentrate; m1 is the mass of fixed carbon required for the pre-reduction of the titanium concentrate.

[0044] Preferably, the formula for calculating the mass of fixed carbon required for the pre-reduction of the titanium concentrate is as follows:

[0045]

[0046] Where m1 is the mass of fixed carbon required for the pre-reduction of the titanium concentrate; m a The mass of FeO in the reduced titanium of the finished product; m c m is the mass of FeO in the titanium concentrate; d The mass of Fe2O3 in the titanium concentrate.

[0047] Preferably, the formula for calculating the additional heat required for the titanium concentrate pre-reduction process is as follows:

[0048] ΔQ = q - Q1;

[0049] Wherein, ΔQ is the heat required to supplement the titanium concentrate pre-reduction process; q is the heat expenditure in the kiln; and Q1 is the effective heat release of the amount of coal required for the titanium concentrate pre-reduction.

[0050] Preferably, the heat expenditure in the kiln includes the heat absorbed by the reduction reaction, the heat of the material heating up, the heat consumed by evaporating moisture, the heat carried away by the exhaust gas, and the heat lost by the reduction system.

[0051] Preferably, the formula for calculating the heat expenditure inside the kiln is:

[0052] q = q1 + q2 + q3 + q4 + q5;

[0053] Where q represents the heat expenditure inside the kiln; q1 represents the heat absorbed by the reduction reaction; q2 represents the heat generated by the material heating up; q3 represents the heat consumed by evaporating moisture; q4 represents the heat carried away by the waste gas; and q5 represents the heat lost by the reduction system.

[0054] Preferably,

[0055] Wherein, ΔH2 is the heat absorbed by Fe2O3+3C=2Fe+3CO; ΔH3 is the heat absorbed by FeO+C=Fe+CO.

[0056] Preferably, q2 = c 矿 m 矿 ΔT;

[0057] Among them, c 矿 The specific heat capacity of the ore is taken as 0.27142 kcal / (kg℃); m 矿 The mass of the ore is ΔT; the difference between the discharge temperature and the room temperature is ΔT.

[0058] Preferably, q3 = m 矿 ×H2O%×100×c 水 ;

[0059] Where, m 矿 The mass of the ore is H2O%, which is the water content in the ore; c 水 The specific heat capacity of water is taken as 1 kcal / (kg℃).

[0060] Preferably, q4 = V 气 ×Tg×c 气 ;

[0061] Among them, V 气 The flue gas volume of the system is expressed in m³. 3 Tg is the flue gas temperature; c 气 The specific heat capacity of the flue gas is taken as 0.32 kcal / (m³). 3 ℃).

[0062] Preferably, V 气 = Hourly feed rate / 6000 × 8000

[0063] The hourly ore feed rate is the amount of ore fed into the rotary kiln per hour, expressed in kg.

[0064] Preferably, q5 = a(T1-T2)πDLt;

[0065] Where a is the heat transfer coefficient, a = 3.5 + 0.062T1; T1 is the outer surface temperature of the cylinder, in °C; T2 is the ambient temperature, in °C; D is the outer diameter of the rotary kiln, in m; L is the length of the rotary kiln, in m; and t is the heat dissipation time, in s.

[0066] Preferably, the effective heat release formula for calculating the amount of coal required for the pre-reduction of the titanium concentrate is as follows:

[0067] Q1 = Q - Q2 - Q3;

[0068] Wherein, Q is the total heat release of the amount of coal required for the pre-reduction of the titanium concentrate; Q2 is the heat lost by fixed carbon participating in the reduction reaction; and Q3 is the heat lost by CO not being burned in the kiln.

[0069] Preferably, the formula for calculating the heat loss due to the fixed carbon participating in the reduction reaction is:

[0070]

[0071] Where Q2 is the heat lost by the fixed carbon in the reduction reaction; m1 is the mass of fixed carbon required for the pre-reduction of the titanium concentrate; and ΔH1 is the heat released per unit of the reaction 2C + O2 = 2CO.

[0072] The formula for calculating the heat lost due to CO not burning in the kiln is as follows:

[0073]

[0074] Wherein, Q3 is the heat lost due to the CO not being burned in the kiln; m 矿 The mass of the reduced titanium in the finished product; the calorific value of CO is 3018 kcal / m³. 3 CO% refers to the CO content in the exhaust gas.

[0075] Preferably, the formula for calculating the total heat release of the coal required for the pre-reduction of the titanium concentrate is as follows:

[0076] O = m2 × calorific value of coal;

[0077] Where Q is the total heat release of the amount of coal required for the pre-reduction of the titanium concentrate; m2 is the amount of coal required for the pre-reduction of the titanium concentrate; and the calorific value of the coal is 7450 kcal / kg.

[0078] Preferably, the formula for calculating the make-up air volume is as follows:

[0079]

[0080] Among them, V 风 The make-up air volume; n o3 This refers to the amount of oxygen supplemented.

[0081] Preferably, the formula for calculating the oxygen supplementation amount is as follows:

[0082] n o3 =n o -n o1 -n o2 ;

[0083] Where, n o3 The oxygen supplementation amount; n o The oxygen content required for the conversion of carbon into carbon oxides corresponding to the stated amount of coal added; n o1 The amount of oxygen obtained from iron oxides in titanium concentrate; n o2 This refers to the amount of oxygen obtained from coal.

[0084] Preferably, the formula for calculating the oxygen content required for the carbon element corresponding to the amount of coal added is as follows:

[0085]

[0086] Where, n o The oxygen content required for the carbon element corresponding to the stated coal addition amount; m e The carbon content corresponding to the amount of coal added; CO% is the CO content in the exhaust gas; CO2% is the CO2 content in the exhaust gas.

[0087] Preferably, the formula for calculating the carbon content corresponding to the amount of coal added is as follows:

[0088] m e =m 加煤量 ×C%;

[0089] Where, m e The carbon content corresponding to the amount of coal added; m 加煤量 The amount of coal added; C% refers to the content of element C in the coal elemental analysis results.

[0090] Preferably, the formula for calculating the amount of oxygen obtained from the ore is:

[0091]

[0092] Where, n o1 m1 represents the amount of oxygen obtained from the ore; m1 represents the mass of fixed carbon required for the pre-reduction of the titanium concentrate.

[0093] Preferably, the formula for calculating the amount of oxygen obtained from coal is:

[0094]

[0095] Where, n o2 The amount of oxygen obtained from coal; m 加煤量 The amount of coal added is 0%; 0% represents the oxygen content in the coal elemental analysis.

[0096] Preferably, the method further includes: before calculating the FeO content in the finished reduced titanium, analyzing and detecting the mass of FeO and Fe2O3 in the titanium concentrate using the XRF method, and calculating the iron content based on the content of FeO and Fe2O3, denoted as TFe.

[0097] The exhaust gas involved in this invention is the flue gas generated in the rotary kiln.

[0098] The embodiments of the present invention will now be described in detail with reference to examples.

[0099] Example

[0100] The method for determining reduction parameters in the titanium concentrate pre-reduction process provided in this embodiment includes the following steps:

[0101] a. A rotary kiln is used to produce reduced titanium. The outer diameter of the kiln is 5m and the length is 95m. The feed rate is 400kg per minute. The titanium, iron and moisture composition of the titanium concentrate used is shown in Table 1. It is used to produce reduced titanium with a metallization rate of 85%. The coal index is shown in Table 2. The elemental analysis of the coal is shown in Table 3.

[0102] Table 1

[0103] Composition H2O TiO2 TFe FeO Fe2O3 Content % 0.35 57.43 23.85 20.03 22.68

[0104] Table 2

[0105]

[0106] Table 3

[0107] C H O N S 78％ 6％ 12％ 2％ 2％

[0108] The CO content in the exhaust gas is 5 vol%, and the CO:CO2 = 3:7.

[0109] b. Mass m of FeO in reduced titanium a :

[0110] m a =23.85×(100-85)%÷56×72

[0111] = 4.59964285714286 kg;

[0112] The mass loss Δm during the conversion of titanium concentrate into reduced titanium:

[0113] Δm=20.03+22.68-23.85×85%-4.59964285714286

[0114] = 17.8378571428571 kg;

[0115] The ore ratio k for producing the selected reduced titanium:

[0116] K=100÷(1-17.8378571428571)=1.21710554913194;

[0117] FeO content in reduced titanium for selected metal conversion:

[0118] (FeO)%=4.59964285714286 / 1×1.21710554913194

[0119] =5.59825084545366;

[0120] c. Obtain the required exhaust temperature Tg and discharge temperature Ts based on the predetermined metal conversion rate;

[0121]

[0122]

[0123] d. Based on the required discharge temperature, exhaust temperature, and conversion rate, determine the required make-up air volume and coal feed volume;

[0124] m1={22.68 / 160×36+(20.03-4.5996) / 72×12}×240

[0125] =1841.93428571429 kg;

[0126] The amount of coal required for reduction, m2, is then obtained:

[0127] m2=1841.93428571429÷58.5%

[0128] = 3148.60561660562 kg;

[0129] m2 of coal can release heat Q:

[0130] Q=3148.60561660562×7450×4.182÷1000

[0131] =98097.641730403MJ;

[0132] The heat lost (Q2) due to some fixed carbon participating in the reduction reaction:

[0133] Q2 = 1841.93428571429 / 24 × 221

[0134] =16961.1448809524 MJ;

[0135] The heat lost due to some CO not burning in the kiln, Q3:

[0136] Q3=32000×5%×3018×4.182÷1000

[0137] =20194.0416MJ;

[0138] The effective calorific value of coal per cubic meter (m²) is Q1:

[0139] Q1 = Q - Q2 - Q3

[0140] =60942.4552494506MJ;

[0141] The heat expenditure inside the kiln, q:

[0142] q = q1 + q2 + q3 + q4 + q5;

[0143] The reduction reaction requires the absorption of heat q1:

[0144] q1={22.68 / 160×490.02+(20.03-4.5996) / 72×158.49}×240÷1000

[0145] =24822.3380785714 MJ;

[0146] The amount of heat q2 required to heat the material:

[0147] q2=0.27142×400×60×(1156-25)

[0148] =30810.56917536MJ;

[0149] The heat q3 required to evaporate water:

[0150] q3=24000×0.35%×100×4.182

[0151] =35.1288MJ;

[0152] Exhaust gas carries away heat q4:

[0153] q4 = 32000 × 715 × 0.35 × 4.182

[0154] =33489.456MJ;

[0155] System surface heat dissipation q5:

[0156] q5=(3.5+0.062×130)×(130-25)×3.14×5×95×3600÷1000000

[0157] =6517.37772MJ;

[0158] q = q1 + q2 + q3 + q4 + q5

[0159] = 95674.8697739314 MJ;

[0160] Required coal replenishment:

[0161] m3=((95674.8697739314-60942.4552494506)) / (7450×4.182)

[0162] =1114.7941328763 kg;

[0163] e. Calculate the required air volume based on the coal quantity:

[0164] Calculate the carbon content in coal:

[0165] m c = (3148.60561660562 + 1114.7941328763) × 78%

[0166] =3325.4518045959 kg;

[0167] Calculate the oxygen content required for carbon:

[0168] n o =3325.4518045959 / 12×30% + 3325.4518045959 / 12×2×70%

[0169] = 471.105672317752 kmol;

[0170] Some of the oxygen content can be obtained from the ore (n o1 ) and coal (n o2 From ) we get:

[0171] n o1=1841.93428571429 / 12=153.494523809524kmol;

[0172] n o2 =3325.4518045959 / 16×12%=24.9408885344693kmol;

[0173] Therefore, the amount of oxygen that needs to be replenished is n. o3 :

[0174] n o3 =n o -n o1 -n o2 =292.670259973759kmol;

[0175] Therefore, the required additional air volume is:

[0176] V 风 =292.670259973759 / 2×22.4 / 0.21=15609.0805319338m 3 / h.

[0177] Based on the above calculations, production was organized using a φ5*95 meter rotary kiln for the ore and coal in the example, with the target of producing reduced titanium with a metallization rate of 85%. This rotary kiln is equipped with a kiln body fan for supplying air into the kiln; the fan is also frequency-controlled to regulate the airflow. After mixing, the ore and coal are added to the kiln through the kiln tail, while a portion of pulverized coal is also injected at the kiln head.

[0178] The production parameters are set as follows:

[0179] Charge kg / min Coal addition at kiln tail kg / min Coal addition at kiln head kg / min Air volume m 3 / h]] 400 51 20 15600

[0180] The product specifications are as follows:

[0181] Metalization % CaO % TiO2% 85.77 0.15 58.80

[0182] Although the present invention has been illustrated and described with specific embodiments, it should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, without departing from the spirit and scope of the present invention; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such substitutions and modifications that fall within the scope of the present invention are included in the appended claims.

Claims

1. A method for determining reduction parameters in a titanium concentrate pre-reduction process, characterized in that, Includes the following steps: (a) Calculate the FeO content in the finished reduced titanium based on the target metal conversion rate and the composition of the titanium concentrate; (b) Calculate the discharge temperature and exhaust temperature based on the target metal conversion rate; (c) Calculate the amount of coal to be added based on the discharge temperature, the exhaust temperature and the target metal conversion rate; (e) Calculate the make-up air volume based on the stated coal addition amount; The formula for calculating the discharge temperature based on the target metal conversion rate is as follows: ； Where Ts is the discharge temperature; η is the target metal conversion rate; The formula for calculating the exhaust temperature based on the target metal conversion rate is as follows: ； Wherein, Tg is the exhaust temperature; η is the target metal conversion rate; The formula for calculating the amount of coal added is as follows: ; Where, m 加煤量 m2 is the amount of coal added; m2 is the amount of coal required for the pre-reduction of the titanium concentrate. Q represents the heat required to supplement the titanium concentrate pre-reduction process; the calorific value of coal is taken as 7450 kcal / kg. The formula for calculating the amount of coal required for the pre-reduction of titanium concentrate is as follows: ； Wherein, m2 is the amount of coal required for the pre-reduction of the titanium concentrate; m1 is the mass of fixed carbon required for the pre-reduction of the titanium concentrate; The formula for calculating the mass of fixed carbon required for the pre-reduction of the titanium concentrate is as follows: ； Where m1 is the mass of fixed carbon required for the pre-reduction of the titanium concentrate; m a The mass of FeO in the reduced titanium of the finished product; m c m is the mass of FeO in the titanium concentrate. d The mass of Fe2O3 in the titanium concentrate; The formula for calculating the additional heat required for the titanium concentrate pre-reduction process is as follows: ； in, Q represents the heat required to supplement the titanium concentrate pre-reduction process; q represents the heat expenditure inside the kiln; Q1 represents the effective heat release of the amount of coal required for the titanium concentrate pre-reduction. The formula for calculating the make-up air volume is as follows: ； Among them, V 风 The make-up air volume; n o3 This refers to the amount of oxygen supplementation; The formula for calculating the oxygen supplementation amount is as follows: ； Where, n o3 The oxygen supplementation amount; n o The oxygen content required for the conversion of carbon into carbon oxides corresponding to the stated amount of coal added; n o1 The amount of oxygen obtained from iron oxides in titanium concentrate; n o2 The amount of oxygen obtained from coal; The formula for calculating the required oxygen content for the carbon element corresponding to the amount of coal added is as follows: ； Where, n o The oxygen content required for the carbon element corresponding to the stated coal addition amount; m e The carbon content corresponds to the amount of coal added; CO% is the CO content in the exhaust gas; CO2% is the CO2 content in the exhaust gas; The formula for calculating the carbon content corresponding to the amount of coal added is as follows: ； Where, m e The carbon content corresponding to the amount of coal added; m 加煤量 The amount of coal added; C% refers to the content of element C in the coal elemental analysis results; The formula for calculating the amount of oxygen obtained from the ore is: ； Where, n o1 m1 is the amount of oxygen obtained from the ore; m2 is the mass of fixed carbon required for the pre-reduction of the titanium concentrate. The formula for calculating the amount of oxygen obtained from coal is as follows: ； Where, n o2 The amount of oxygen obtained from coal; m 加煤量 The amount of coal added is 0%; 0% represents the oxygen content in the coal elemental analysis.

2. The method for determining reduction parameters in the titanium concentrate pre-reduction process according to claim 1, characterized in that, The target metal conversion rate is 20%~95%.

3. The method for determining reduction parameters in the titanium concentrate pre-reduction process according to claim 1, characterized in that, The formula for calculating the FeO content in the finished reduced titanium is as follows: ； Where, m a The mass of FeO in the reduced titanium of the finished product; m 矿 The mass of the reduced titanium product is denoted as ; k is the mineral ratio of the reduced titanium product. The formula for calculating the mass of FeO in the finished reduced titanium is as follows: ； Where, m a The mass of FeO in the reduced titanium of the finished product; m b η is the mass of TFe in the titanium concentrate; η is the target metal conversion rate; The formula for calculating the ore ratio of the finished reduced titanium is as follows: ； Wherein, k is the ore ratio of the reduced titanium in the finished product; m represents the mass loss from the pre-reduction process; The formula for calculating the mass loss of the pre-reduction process is as follows: ; in, m represents the mass loss from the pre-reduction process; m c m is the mass of FeO in the titanium concentrate. d m is the mass of Fe2O3 in the titanium concentrate; b The mass of TFe in the titanium concentrate; η is the target metal conversion rate; m a The mass of FeO in the reduced titanium of the finished product.

4. The method for determining reduction parameters in the titanium concentrate pre-reduction process according to claim 1, characterized in that, The heat expenditure inside the kiln includes the heat absorbed by the reduction reaction, the heat of the material heating up, the heat consumed by evaporating moisture, the heat carried away by the exhaust gas, and the heat lost by the reduction system.

5. The method for determining reduction parameters in the titanium concentrate pre-reduction process according to claim 4, characterized in that, The effective heat release formula for calculating the amount of coal required for the pre-reduction of titanium concentrate is as follows: ； Wherein, Q is the total heat release of the amount of coal required for the pre-reduction of the titanium concentrate; Q2 is the heat lost by fixed carbon participating in the reduction reaction; and Q3 is the heat lost by CO not being burned in the kiln. The formula for calculating the total heat release of the coal required for the pre-reduction of the titanium concentrate is as follows: ； Where Q is the total heat release of the amount of coal required for the pre-reduction of the titanium concentrate; m2 is the amount of coal required for the pre-reduction of the titanium concentrate; and the calorific value of the coal is 7450 kcal / kg.

6. The method for determining reduction parameters in the titanium concentrate pre-reduction process according to claim 1, characterized in that, The method further includes: before calculating the FeO content in the finished reduced titanium, analyzing and detecting the mass of TFe, FeO and Fe2O3 in the titanium concentrate respectively.

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