A method for adjusting the ferrous oxide content of a stabilizing sintered ore

Abstract

The invention discloses a method for adjusting the ferrous oxide content of a stable sintered ore, which specifically comprises: dividing the sintered ore into a plurality of particle size grades, and online detecting the mass percentage of FeO of each particle size grade and the sintering end temperature; setting a control interval of the FeO mass percentage of the sintered ore, a sintering end temperature control interval and a percentage point standard deviation of the FeO mass percentage of each particle size grade; judging the thermal state of the sintering process according to the average value of the FeO mass percentage of each particle size grade, the relationship between the sintering end temperature and the corresponding control interval and the number of FeO mass percentages in each particle size grade falling into the control interval, and formulating an adjustment plan accordingly; the problem that after the FeO content of the sintered ore fluctuates, the prior art does not provide an effective and rapid method for adjusting the FeO content value to a stable value is solved.

Description

Technical Field

[0001] The invention relates to the field of ironmaking production, specifically to a sintering production technology, and in particular to a method for adjusting the ferrous oxide content of a stable sintered ore. Background Art

[0002] In the iron-making process, sintering is an important link in providing raw materials for blast furnace iron-making. The production of sintered ore by sintering not only solves the problem of iron-making with lean ore, but also improves the metallurgical properties of iron-containing raw materials, thereby significantly improving the blast furnace production indicators and economic indicators.

[0003] Ferrous oxide is an important component of sintered ore. Its main characteristics are that its formation mechanism is complex and there are many influencing factors during the sintering process. Its content in the sintered ore fluctuates greatly and its distribution is uneven. Ferrous oxide is also an important influencing factor of sintering production indicators and sintered ore quality indicators. Sometimes it even directly leads to fluctuations in the sintering production process. For example, the destruction of the return ore balance is generally closely related to the disorder of ferrous oxide control.

[0004] Ferrous oxide is closely related to the main properties of sintered ore, such as phase composition, mineral structure (macrostructure and microstructure), mechanical strength, particle size composition, reducibility, and droplet properties, which in turn affects blast furnace smelting. Practice shows that a 1% fluctuation in the FeO content of sintered ore affects the blast furnace coke ratio by 1% to 1.5% and the blast furnace output by 1% to 1.5%. Just as the silicon content in pig iron can represent the relative furnace temperature of the blast furnace, ferrous oxide can represent the relative level of sintering temperature, which is a comprehensive reflection of the sintering atmosphere and heat level.

[0005] As ferrous oxide is difficult to control and has a complex effect on the sintering process, it is difficult to calculate its content using general methods to achieve the purpose of prediction and control.

[0006] At present, the on-site control adopts the experience method of manual judgment, that is, the operator observes the brightness and thickness of the red fire layer of the sintered ore through the observation hole at the tail of the sintering machine with the naked eye at regular intervals, estimates the approximate amount of ferrous oxide in the sintered ore, and then compares it with the test value to obtain the corresponding ferrous oxide value under certain red fire layer thickness and brightness conditions, and then adjusts the fuel ratio and operating parameters. After long-term accumulation, useful experience is formed. This judgment method can achieve certain results for experienced operators, but its limitations are also obvious. First, the quality of operators is different, the technical level is high and low, and the sense of responsibility is also different; second, the quality of raw fuel fluctuates at any time, and the correspondence between the thickness and brightness of the red fire layer and ferrous oxide is not strict, mainly because there are too many factors affecting ferrous oxide, and this correspondence is only one aspect. The sintering process is a complex redox process. Even if the carbon content is the same, the ferrous oxide generated is different. Therefore, ferrous oxide has the lowest stability among all the components of sintered ore.

[0007] Patent CN105276988A proposes a method for controlling the FeO content in the cross section of the tail of a sintering machine, which uses an infrared and visible light dual CCD image monitoring system to obtain cross-section feature data packets, and analyzes the FeO content level of the sintered ore through a fuzzy clustering system and a neural network system. This method requires multiple sets of special equipment, infrared and visible light dual CCD image detection systems, and high-precision lenses to ensure the clarity of image acquisition. However, the tail of the sintering machine is a dusty environment, the lens is easily damaged, the overall cost of the equipment is high, and it is impossible to operate on site for a long time. There is no rapid adjustment method for the fluctuation of the FeO content in the sintered ore.

[0008] Patent CN104977316A proposes a method for determining the trend of FeO content in sintered ore. The relationship between the difference between the large flue temperature and the cooling exhaust gas temperature and the FeO content in sintered ore is used to establish a mapping relationship between the temperature difference range and the FeO content, thereby predicting the FeO content in sintered ore. The generation of FeO content in sintered ore is a complex chemical and physical change process. This patent only considers the influence of the large flue temperature and the cooling exhaust gas temperature on the FeO content in sintered ore. On the one hand, it ignores the influence of sintering raw material parameters and other process parameters, and does not provide a rapid adjustment method after the FeO content in sintered ore fluctuates. Summary of the invention

[0009] In view of this, the present invention provides a method for adjusting the ferrous oxide content of a stable sintered ore, so as to solve the problem that after the FeO content of the sintered ore fluctuates, the prior art does not provide an effective and rapid method for adjusting the FeO content to a stable value.

[0010] To achieve the above-mentioned object of the invention, the method for stabilizing the ferrous oxide content of sintered ore comprises:

[0011] dividing the sintered ore into several particle size grades;

[0012] Online detection of the mass percentage of FeO in each particle size grade and the sintering end point temperature;

[0013] Set the control range of FeO mass percentage of sintered ore, the control range of sintering end point temperature and the standard deviation of the percentage points of FeO mass percentage of each particle size grade;

[0014] Determine the thermal state of the sintering process according to the relationship between the average mass percentage of FeO in each particle size grade and the FeO mass percentage control interval, the relationship between the sintering endpoint temperature and the sintering endpoint temperature control interval, and the number of FeO mass percentages in each particle size grade falling within the FeO mass percentage control interval;

[0015] An adjustment plan is formulated according to the thermal state of the sintering process until the mass percentage of FeO in each particle size grade of the sintered ore is within the control range of the mass percentage of FeO in the sintered ore and the standard deviation is less than a set value.

[0016] In some possible embodiments of the present disclosure, the sintered ore is divided into three particle size grades, which are 5-10 mm, 11-40 mm and larger than 40 mm.

[0017] In some and possible embodiments of the present disclosure, a method for determining a thermal state of a sintering process includes:

[0018] The sintered ore FeO mass percentage control interval is set to [F1, F2], wherein F1 and F2 are the lower control limit and the upper control limit, respectively; the sintering endpoint temperature control interval is set to [W1, W2], wherein W1 and W2 are the lower control limit and the upper control limit, respectively; the average value of the mass percentage of FeO of the three particle size grades is represented by E, the mass percentage of FeO of the three particle size grades is represented by m, n and k, respectively, and the standard deviation of the percentage points of the mass percentage of FeO of the three particle size grades is represented by S;

[0019] When E is greater than F2 and T is within the interval [W1, W2], the sintering process is determined to be in the first level of overheating;

[0020] When E is greater than F2 and T is greater than W2, the sintering process is determined to be in the second level of overheating state;

[0021] When E is within the interval [F1, F2], T is within the interval [W1, W2], and m, n and k are all within the interval [F1, F2], but the standard deviation S is greater than the set value, the sintering process is judged to be in the first level of thermal unevenness;

[0022] When E is within the interval [F1, F2], T is within the interval [W1, W2], and one of m, n and k is not within the interval [F1, F2], the sintering process is determined to be in the second level of thermal inhomogeneity;

[0023] When E is within the interval [F1, F2], T is not within the interval [W1, W2], and one of m, n and k is not within the interval [F1, F2], the sintering process is determined to be in the third level of thermal unevenness;

[0024] When E is within the interval [F1, F2], T is within the interval [W1, W2], and two of m, n and k are not within the interval [F1, F2], the sintering process is determined to be in the fourth level of thermal unevenness;

[0025] When E is within the interval [F1, F2], T is not within the interval [W1, W2], and two of m, n and k are not within the interval [F1, F2], the sintering process is determined to be in the fifth level of thermal unevenness;

[0026] When E is within the interval [F1, F2], and m, n, and k are all outside the interval [F1, F2], the sintering process is determined to be in the sixth level of thermal unevenness;

[0027] When E is less than F1 and T is within the interval [W1, W2], the sintering process is determined to be in the first level of the heat deficiency state;

[0028] When E is less than F1 and T is less than W1, the sintering process is determined to be in the second stage of the heat deficiency state.

[0029] In some possible embodiments of the present disclosure, the adjustment scheme is formulated according to the thermal state of the sintering process, and the adjustment measures corresponding to the adjustment scheme are:

[0030] When the sintering process is in the first level of overheating, the sintering fuel ratio and the oxygen content of the heat preservation hot air are adjusted, the sintering fuel ratio is reduced by 0.2 to 0.4 percentage points, and the oxygen content of the heat preservation hot air is increased by 1 to 3 percentage points;

[0031] When the sintering process is in the second level of overheating, the sintering fuel ratio and the exhaust negative pressure are adjusted, the sintering fuel ratio is reduced by 0.4 to 0.6 percentage points, and the sintering exhaust negative pressure is increased by 5% to 10%;

[0032] When the sintering process is in the first level of thermal unevenness, the preheating temperature of the sintering material and the temperature of the heat preservation hot air are adjusted, the preheating temperature of the sintering material is increased by 5 to 15°C, and the temperature of the heat preservation hot air is increased by 10 to 20°C;

[0033] When the sintering process is in the second stage of thermal unevenness, the moisture content of the sintering material and the temperature of the heat preservation hot air are adjusted, the moisture content of the sintering material is reduced by 0.1 to 0.2 percentage points, and the temperature of the heat preservation hot air is increased by 10 to 20°C;

[0034] When the sintering process is in the third stage of thermal unevenness, the preheating temperature of the sintering material and the oxygen content of the heat preservation hot air are adjusted, the preheating temperature of the sintering material is increased by 5 to 10°C, and the oxygen content of the heat preservation hot air is increased by 1 to 3 percentage points;

[0035] When the sintering process is in the fourth stage of thermal unevenness, the sintering ignition temperature and the heat preservation hot air temperature are adjusted, the sintering ignition temperature is increased by 10-20°C, and the heat preservation hot air temperature is reduced by 15-25°C;

[0036] When the sintering process is in the fifth level of thermal unevenness, the sintering material preheating temperature and the insulation hot air temperature are adjusted, the sintering material preheating temperature is increased by 5 to 15° C., and the insulation hot air temperature is reduced by 10 to 20° C.;

[0037] When the sintering process is in the sixth level of thermal unevenness, the sintering fuel ratio and the insulation hot air temperature are adjusted, the sintering fuel ratio is reduced by 0.1 to 0.2 percentage points, and the insulation hot air temperature is increased by 15 to 25°C;

[0038] When the sintering process is in the first stage of the heat-deficient state, the sintering fuel ratio and the oxygen content of the heat-insulating hot air are adjusted, the sintering fuel ratio is increased by 0.2 to 0.4 percentage points, and the oxygen content of the heat-insulating hot air is reduced by 1 to 3 percentage points;

[0039] When the sintering process is in the second stage of the heat-deficient state, the sintering fuel ratio and the exhaust negative pressure are adjusted, the sintering fuel ratio is increased by 0.4 to 0.6 percentage points, and the sintering exhaust negative pressure is reduced by 5% to 10%.

[0040] In some possible embodiments of the present disclosure, the adjustment plan is formulated according to the sintering process status at intervals of 1 to 2 hours, and adjustment instructions are given according to the adjustment plan and the adjustment measures.

[0041] In some possible embodiments of the present disclosure, F1 is 7% to 8%, and F2 is 8.5% to 9.5%.

[0042] In some possible embodiments of the present disclosure, the W1 is 380-400°C, the W2 is 400-420°C, and the difference between the W2 and the W1 is ≤30°C.

[0043] In some possible embodiments of the present disclosure, the set value of the standard deviation is 0.1-0.4.

[0044] In some and possible embodiments of the present disclosure, the percentage point of the FeO mass percentage is the FeO mass percentage multiplied by 100.

[0045] The present invention has the following beneficial effects:

[0046] The method for stabilizing the ferrous oxide content of sintered ore of the present invention determines the thermal state of the sintering process according to the relationship between the mass percentage of ferrous oxide in sintered ore with different particle sizes, the sintering end temperature and the set value, and on this basis, formulates a targeted adjustment strategy for the ferrous oxide of the sintered ore, thereby realizing rapid and stable adjustment after the ferrous oxide of the sintered ore fluctuates, providing a guarantee for improving the ferrous oxide stability rate and metallurgical properties of the sintered ore, and further reducing the sintering solid fuel consumption, effectively solving the problem that after the FeO content of the sintered ore fluctuates, the prior art does not provide an effective and rapid method for adjusting the FeO content value to a stable value. DETAILED DESCRIPTION

[0047] The following is a description of the adjustment method of the present invention based on embodiments, but it is worth noting that the present application is not limited to these embodiments. In the detailed description of the present application below, some specific details are described in detail. However, for the parts not described in detail, those skilled in the art can also fully understand the present application.

[0048] At the same time, unless the context clearly requires otherwise, the words "include", "comprises" and similar words throughout the specification and claims should be interpreted as inclusive rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0049] Example 1

[0050] A method for adjusting the ferrous oxide content of a stable sintered ore, wherein the lower limit F1 and the upper limit F2 of the FeO mass percentage of the sintered ore are set to 8% and 8.8% respectively, that is, the FeO control interval of the sintered ore is set to [8%, 8.8%]. The lower limit W1 and the upper limit W2 of the sintering end temperature control are set to 390°C and 410°C respectively, that is, the sintering end temperature control interval is set to [390, 410]. The sintered ore is divided into three particle size grades of 5-10mm, 11-40mm and greater than 40mm, and the standard deviation S of the percentage point of the FeO mass percentage has a control value σ of 0.2.

[0051] The FeO online detector detected that the FeO mass percentages of the three particle sizes of the finished sintered ore, 5-10mm, 11-40mm and larger than 40mm, were 8.7%, 8.8% and 9.8% respectively; the sintering endpoint temperature measured by the online temperature measuring couple was 415℃.

[0052] The average value E of the FeO mass percentage of the three particle size grades of the finished sintered ore, 5-10mm, 11-40mm and greater than 40mm, is 9.1%, which is greater than 8.8%; the sintering end temperature T is 415°C, which is greater than 410°C, so it is determined that the sintering process is a secondary overheating state.

[0053] The sintering machine expert system gives instructions to adjust the sintering fuel ratio and exhaust negative pressure, among which the sintering fuel ratio is reduced by 0.5 percentage points and the sintering exhaust negative pressure is increased by 5%.

[0054] According to the state of the sintering process, the sintering machine expert system gives adjustment instructions every 2 hours according to the adjustment measures until the FeO mass percentages m, n and k of the three particle sizes of sintered ore 5-10mm, 11-40mm and greater than 40mm are all in the range of [8%, 8.8%], and the standard deviation of the percentage points of m, n and k is less than 0.2.

[0055] After the adjustment method of the present application is applied in Example 1, the FeO stability rate of the sintered ore is increased from 92.3% to 96.5%, and the sintering solid fuel consumption is reduced from 48.4kg / t to 42.5kg / t; the drum strength of the sintered ore is increased from 79.8% to 85.4%, and the reduction degree is increased from 81.2% to 88.6%.

[0056] Example 2

[0057] A method for adjusting the ferrous oxide content of a stable sintered ore, wherein the lower limit F1 and the upper limit F2 of the FeO mass percentage of the sintered ore are set to 7.5% and 9% respectively, that is, the FeO control interval of the sintered ore is set to [7.5%, 9%]. The lower limit W1 and the upper limit W2 of the sintering end temperature control are set to 385°C and 415°C respectively, that is, the sintering end temperature control interval is set to [385, 415]. The standard deviation S of the percentage points of the FeO mass percentage of the sintered ore divided into three particle size grades of 5-10mm, 11-40mm and greater than 40mm has a control value σ of 0.4.

[0058] The FeO online detector detected that the FeO mass percentages of the three particle sizes of the finished sintered ore, 5-10mm, 11-40mm and larger than 40mm, were 7.6%, 9.4% and 9.6% respectively; the sintering endpoint temperature measured by the online temperature measuring couple was 410℃.

[0059] The average value E of the FeO mass percentage of the three particle size grades of the finished sintered ore 5-10mm, 11-40mm and greater than 40mm is 8.9%, which is within the range of [7.5%, 9%]; the sintering end temperature T is 410℃, which is within the range of [385, 415], so it is judged that the sintering process is the fourth level of thermal unevenness.

[0060] The sintering machine expert system gives instructions to adjust the sintering ignition temperature and the insulation hot air temperature, where the ignition temperature is increased by 10°C and the insulation hot air temperature is reduced by 20°C.

[0061] According to the state of the sintering process, the sintering machine expert system gives adjustment instructions according to the adjustment measures every hour until the FeO mass percentages m, n and k of the three particle sizes of sintered ore 5-10mm, 11-40mm and greater than 40mm are all in the range of [7.5%, 9%], and the standard deviation S of the percentage points of m, n and k is less than 0.4.

[0062] After the adjustment method of the present application is applied in Example 2, the FeO stability rate of the sintered ore is increased from 91.6% to 97.5%, and the sintering solid fuel consumption is reduced from 47.4kg / t to 43.2kg / t; the drum strength of the sintered ore is increased from 80.6% to 86.2%, and the reduction degree is increased from 80.5% to 87.2%.

[0063] Example 3

[0064] A method for adjusting the ferrous oxide content of a stable sintered ore, wherein the lower limit F1 and the upper limit F2 of the FeO mass percentage of the sintered ore are set to 8% and 9.4% respectively, that is, the FeO control interval of the sintered ore is set to [8%, 9.4%]. The lower limit W1 and the upper limit W2 of the sintering end temperature control are set to 400°C and 420°C respectively, that is, the sintering end temperature control interval is set to [400, 420]. The standard deviation S of the percentage points of the FeO mass percentage of the sintered ore divided into three particle size grades of 5-10mm, 11-40mm and greater than 40mm has a control value σ of 0.3.

[0065] The FeO online detector detected that the FeO mass percentages of the three particle sizes of the finished sintered ore, 5-10mm, 11-40mm and larger than 40mm, were 7.4%, 7.8% and 8.5% respectively; the sintering endpoint temperature measured by the online temperature measuring couple was 395℃.

[0066] The average FeO mass percentage E of the three particle size grades of the finished sintered ore 5-10mm, 11-40mm and greater than 40mm is 7.9%, which is less than 8%. The sintering end temperature T is 395℃, which is less than 400℃, so the sintering process is determined to be the second level of the heat-deficient state.

[0067] The sintering machine expert system gives instructions to adjust the sintering fuel ratio and exhaust negative pressure, among which the sintering fuel ratio is increased by 0.5 percentage points and the sintering exhaust negative pressure is reduced by 6%. According to the state of the sintering process, the sintering machine expert system gives adjustment instructions according to the adjustment measures every 1.5 hours until the FeO mass percentage m, n and k of the three particle sizes of sintered ore 5-10mm, 11-40mm and greater than 40mm are all in the range of [8%, 9.4%], and the standard deviation of the percentage points of m, n and k is less than 0.3.

[0068] After the adjustment method of the present application is applied in Example 3, the FeO stability rate of the sintered ore is increased from 91.3% to 97.1%, and the sintering solid fuel consumption is reduced from 47.4kg / t to 41.5kg / t; the drum strength of the sintered ore is increased from 79.5% to 86.4%, and the reduction degree is increased from 80.2% to 87.6%.

[0069] The above-mentioned embodiments are only embodiments of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present disclosure. It should be pointed out that, for a person of ordinary skill in the art, without departing from the concept of the present disclosure, several variations, equivalent substitutions, improvements, etc. may be made, which all fall within the scope of protection of the present disclosure. Therefore, the scope of protection of this patent shall be subject to the attached claims.

Claims

1. A method for adjusting the ferrous oxide content of a stable sintered ore, characterized in that: include: dividing the sintered ore into several particle size grades; Online detection of the mass percentage of FeO in each particle size grade and the sintering end point temperature; Set the control range of FeO mass percentage of sintered ore, the control range of sintering end point temperature and the standard deviation of the percentage points of FeO mass percentage of each particle size grade; Determine the thermal state of the sintering process according to the relationship between the average mass percentage of FeO in each particle size grade and the FeO mass percentage control interval, the relationship between the sintering endpoint temperature and the sintering endpoint temperature control interval, and the number of FeO mass percentages in each particle size grade falling within the FeO mass percentage control interval; Formulate an adjustment plan according to the thermal state of the sintering process until the mass percentage of FeO of each particle size grade of the sintered ore is within the control range of the mass percentage of FeO of the sintered ore and the standard deviation is less than a set value; The sintered ore is divided into three particle size grades, which are 5-10 mm, 11-40 mm and greater than 40 mm; The method for determining the thermal state of the sintering process includes: The sintered ore FeO mass percentage control interval is set to [F1, F2], wherein F1 and F2 are the lower control limit and the upper control limit, respectively; the sintering endpoint temperature control interval is set to [W1, W2], wherein W1 and W2 are the lower control limit and the upper control limit, respectively; the average value of the mass percentage of FeO of the three particle size grades is represented by E, the mass percentage of FeO of the three particle size grades is represented by m, n and k, respectively, and the standard deviation of the percentage points of the mass percentage of FeO of the three particle size grades is represented by S; When E is greater than F2 and T is within the interval [W1, W2], the sintering process is determined to be in the first level of overheating; When E is greater than F2 and T is greater than W2, the sintering process is determined to be in the second level of overheating state; When E is within the interval [F1, F2], T is within the interval [W1, W2], and m, n and k are all within the interval [F1, F2], but the standard deviation S is greater than the set value, the sintering process is judged to be in the first level of thermal unevenness; When E is within the interval [F1, F2], T is within the interval [W1, W2], and one of m, n and k is not within the interval [F1, F2], the sintering process is determined to be in the second level of thermal inhomogeneity; When E is within the interval [F1, F2], T is not within the interval [W1, W2], and one of m, n and k is not within the interval [F1, F2], the sintering process is determined to be in the third level of thermal unevenness; When E is within the interval [F1, F2], T is within the interval [W1, W2], and two of m, n and k are not within the interval [F1, F2], the sintering process is determined to be in the fourth level of thermal unevenness; When E is within the interval [F1, F2], T is not within the interval [W1, W2], and two of m, n and k are not within the interval [F1, F2], the sintering process is determined to be in the fifth level of thermal unevenness; When E is within the interval [F1, F2], and m, n and k are all outside the interval [F1, F2], the sintering process is determined to be in the sixth level of thermal unevenness; When E is less than F1 and T is within the interval [W1, W2], the sintering process is determined to be in the first level of heat deficiency state; When E is less than F1 and T is less than W1, the sintering process is determined to be in the second stage of the heat deficiency state; The adjustment plan is formulated according to the thermal state of the sintering process, and the adjustment measures corresponding to the adjustment plan are: When the sintering process is in the first level of overheating, the sintering fuel ratio and the oxygen content of the heat preservation hot air are adjusted, the sintering fuel ratio is reduced by 0.2 to 0.4 percentage points, and the oxygen content of the heat preservation hot air is increased by 1 to 3 percentage points; When the sintering process is in the second level of overheating, the sintering fuel ratio and the exhaust negative pressure are adjusted, the sintering fuel ratio is reduced by 0.4 to 0.6 percentage points, and the sintering exhaust negative pressure is increased by 5% to 10%; When the sintering process is in the first level of thermal unevenness, the preheating temperature of the sintering material and the temperature of the heat preservation hot air are adjusted, the preheating temperature of the sintering material is increased by 5 to 15°C, and the temperature of the heat preservation hot air is increased by 10 to 20°C; When the sintering process is in the second stage of thermal unevenness, the moisture content of the sintering material and the temperature of the heat preservation hot air are adjusted, the moisture content of the sintering material is reduced by 0.1 to 0.2 percentage points, and the temperature of the heat preservation hot air is increased by 10 to 20°C; When the sintering process is in the third stage of thermal unevenness, the preheating temperature of the sintering material and the oxygen content of the heat preservation hot air are adjusted, the preheating temperature of the sintering material is increased by 5 to 10°C, and the oxygen content of the heat preservation hot air is increased by 1 to 3 percentage points; When the sintering process is in the fourth stage of thermal unevenness, the sintering ignition temperature and the heat preservation hot air temperature are adjusted, the sintering ignition temperature is increased by 10-20°C, and the heat preservation hot air temperature is reduced by 15-25°C; When the sintering process is in the fifth level of thermal unevenness, the sintering material preheating temperature and the insulation hot air temperature are adjusted, the sintering material preheating temperature is increased by 5 to 15° C., and the insulation hot air temperature is reduced by 10 to 20° C.; When the sintering process is in the sixth level of thermal unevenness, the sintering fuel ratio and the insulation hot air temperature are adjusted, the sintering fuel ratio is reduced by 0.1 to 0.2 percentage points, and the insulation hot air temperature is increased by 15 to 25°C; When the sintering process is in the first stage of the heat-deficient state, the sintering fuel ratio and the oxygen content of the heat-insulating hot air are adjusted, the sintering fuel ratio is increased by 0.2 to 0.4 percentage points, and the oxygen content of the heat-insulating hot air is reduced by 1 to 3 percentage points; When the sintering process is in the second stage of the heat-deficient state, the sintering fuel ratio and the exhaust negative pressure are adjusted, the sintering fuel ratio is increased by 0.4 to 0.6 percentage points, and the sintering exhaust negative pressure is reduced by 5% to 10%; The F1 is 7% to 8%, and the F2 is 8.5% to 9.5%; The W1 is 380-400°C, the W2 is 400-420°C; the difference between the W2 and the W1 is ≤30°C; The set value of the standard deviation is 0.1-0.

4.

2. The method for adjusting the ferrous oxide content of the stable sintered ore according to claim 1, characterized in that: At intervals of 1 to 2 hours, the adjustment plan is formulated according to the sintering process status, and adjustment instructions are given according to the adjustment plan and the adjustment measures.

3. The method for adjusting the ferrous oxide content of the stable sintered ore according to claim 2, characterized in that: The percentage point of the FeO mass percentage is the FeO mass percentage multiplied by 100.