CN110372197B - A method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool from ferroalloy smelting waste slag - Google Patents

Abstract

The invention relates to a method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool from ferroalloy smelting waste slag. The present invention first obtains T _a and T _b , then compares the two, takes the larger value T _{of the} two as the benchmark for the next operation, then obtains Tc through an experiment; then searches for the optimal compensation temperature through an experiment + iterative method ; Calculate _the minimum melting end point temperature in the process of producing qualified slag wool according to T+Tc+ optimal compensation temperature; then verify whether the minimum melting end point temperature can produce qualified slag wool; if not, increase the best slag wool obtained in the previous step. The compensation temperature is verified by the experiment until the qualified slag wool is obtained. At this time, the corresponding compensation temperature is the optimal compensation temperature. The invention scientifically obtains the lowest melting end point temperature in the process of producing qualified slag wool, saves energy consumption in the melting process, reduces the loss of electric furnace refractory materials, and improves the production efficiency of slag wool.

Description

Method for obtaining minimum melting end point temperature in process of producing qualified slag wool from ferroalloy smelting waste residues

Technical Field

The invention relates to a method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool by using ferroalloy smelting waste residues; belongs to the field of resource utilization of metallurgical waste residues.

Background

The mineral wool has excellent performances of heat preservation, heat insulation, sound insulation and the like, and is widely applied to various fields of national economy. Both natural rock and metallurgical slag can produce mineral wool. Because of the large production of the metallurgical waste slag and the increase of the environmental protection pressure, the resource utilization of the metallurgical slag to produce the mineral wool attracts more and more attention, wherein the ferroalloy smelting waste slag becomes a high-quality raw material for producing the mineral wool due to the high yield and the good cotton forming performance.

The manufacturing processes for mineral wool are divided into centrifugal and blowing processes, depending on the way in which the fibres are formed. The centrifugal method has the advantages of high production efficiency, good product quality and the like, is generally applied to industrial production, and the blowing method is mainly used for experimental research and small-scale production. The specific production process of mineral wool can be simplified as follows: 1. tempering and melting raw materials; 2. centrifuging or blowing to form fiber; 3, collecting cellucotton; 4, subsequent process of product preparation. Regardless of the process and feedstock, complete melting of the slag is a necessary process. The raw materials are heated to a molten state, the energy consumption is huge, and the higher the temperature of the molten state is, the larger the energy consumption is, and the larger the loss of refractory materials and the like is.

At present, the quenching and tempering and melting of raw materials are mainly carried out by an electric arc furnace in the production of mineral wool. The heating principle of the electric furnace is that the graphite electrode and the consumed electric energy are utilized for electric arc heating, compared with the traditional shaft furnace for melting raw materials, the electric furnace has higher heating efficiency and less carbon dioxide emission. In the actual production process of mineral wool, the slag raw material is firstly put into an electric furnace for heating and tempering, and meanwhile, in order to ensure the smooth production process, the final heating temperature, namely the end point melting temperature of the slag raw material is generally much higher than the melting temperature and the melting point of slag. As to how much the end point melting temperature is higher than the melting temperature, there is no scientific and accurate method, and empirical values are generally obtained by industrial practice. The cost of the electric furnace molten raw materials mainly comes from electricity consumption, furnace body refractory material loss and graphite electrode material consumption. However, all costs are directly related to the end point melting temperature of the raw material, and the higher the end point melting temperature, the longer the melting time, the greater the power consumption, and the more severe the erosion of the refractory and the electrode by the slag.

Therefore, the invention of a method is urgently needed to scientifically and accurately determine the end point melting temperature of the slag raw material in the process of producing mineral wool from ferroalloy slag, so that the ferroalloy slag can be used for obtaining mineral wool products with high quality and high efficiency at the lowest possible end point melting temperature. The method has great practical significance for guiding the production, efficient manufacturing and green manufacturing of the mineral wool.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool from ferroalloy smelting waste slag.

The method disclosed by the invention is adopted for determining the smelting end point temperature, so that the end point melting temperature of the ferroalloy slag material can be accurately controlled, the smelting efficiency is greatly improved, the smelting power consumption is saved, and the loss of refractory materials is saved. Meanwhile, the method provided by the invention has the advantages of common detection instruments, simplicity and convenience in operation, strong adaptability, and accurate and scientific obtained data.

In order to achieve the technical purpose of the end point melting temperature, the invention discloses a method for determining the melting end point temperature of slag wool produced by ferroalloy smelting waste slag, which uses the following instruments and equipment: 1, hot wire equipment, 2, a high-temperature melt viscosity tester and 3, an infrared temperature measuring probe; the hot wire equipment is used for measuring the melting temperature interval (melting start temperature T) of the ferroalloy slag_iComplete melting temperature T_a) The viscometer is used for the melting temperature T of the ferroalloy slag_bDetermination that the infrared temperature probe is used for the differential temperature T_cMeasurement of (temperature T of molten slag of iron alloy slag in electric furnace)_dAnd the fiber forming temperature T of the slag when the slag reaches a centrifugal roller or a blowing opening_xA difference of (i.e. T)_c＝T_d-T_x) (ii) a After the temperature data is obtained, the lowest end point melting temperature which can ensure that qualified products can be produced is finally obtained by considering the compensation temperature and matching the iteration of the compensation temperature and the experiment.

The invention relates to a method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool by using ferroalloy smelting waste residues; obtaining the complete melting temperature T of the ferroalloy smelting waste residue_aObtaining the melting temperature T of the ferroalloy smelting waste residue_b，

For the same batch of ferroalloy smelting waste slag raw materials, the temperature T of the molten slag in the electric furnace is carried out at least once_dAnd fiber forming temperature T_eTest by T_d-T_e＝T_cCalculating to obtain T_c(ii) a When the same batch of ferroalloy smelting waste slag raw materials are tested for multiple times, T_dAverage value of multiple tests, T_eAlso the average of a number of tests, said T_dGreater than or equal to T_a+200 ℃ and T_dGreater than or equal to T_b+200 ℃; meanwhile, detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, and if the quality is qualified; the following steps are carried out; if not, adjusting T_dUntil the quality of the obtained mineral wool is qualified, the method comprises the following steps:

definition of T_{Big (a)}Is T_a、T_bThe higher of the two;

the melting end point temperature T is calculated by the first theory_f1Is the melting temperature T_{Big (a)}Plus a difference temperature T_cIn addition to the compensation temperature T_g1I.e. T_f1＝T_{Big (a)}+T_c+T_g1(1) (ii) a At this time T_g1Any temperature greater than 0 degrees celsius; the operation then proceeds in two cases:

the first condition is as follows:

heating the same batch of ferroalloy smelting waste residue raw material to T_f1Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is qualified; further use of a value lower than T_g1Compensated temperature T of_g2Instead of T_g1Substituted into equation (1) to calculate and determine a temperature T_f2(ii) a Then heating the same batch of ferroalloy smelting waste residue raw material to T_f2Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is qualified; further use of a value lower than T_g2Compensated temperature T of_g3Instead of T_g2Substituted into equation (1) to calculate and determine a temperature T_f3(ii) a Repeating the operation until the compensation temperature is T_giWhen the quality of the obtained product is not qualified, then at T_giTo T_gi-1In the temperature interval of (3), selecting the experimental temperature from low to high; until a qualified product is obtained, the compensation temperature of the obtained qualified product is T_gi+nThe optimum compensation temperature is obtained; then at this time equation (1) becomes T_f＝T_{Big (a)}+T_c+T_gi+n(ii) a I is greater than or equal to 2, and n is greater than or equal to 1;

if at T_f2Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is unqualified; then at T_f1And T_f2Selecting the experimental temperature from low to high; until a qualified product is obtained, the compensation temperature of the obtained qualified product is T_g2+n(ii) a Namely the optimal compensation temperature; then at this time equation (1) becomes T_f＝T_{Big (a)}+T_c+T_g2+n(ii) a N is greater than or equal to 1;

case two:

heating the same batch of ferroalloy smelting waste residue raw material to T_f1Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is unqualified; further adopt a value higher than T_g1Compensated temperature T of_g2Instead of T_g1Substituted into equation (1) to calculate and determine a temperature T_f2(ii) a And at T_f2Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is qualified; then at T_f1And T_f2Selecting the experimental temperature from low to high; until a qualified product is obtained, the compensation temperature of the obtained qualified product is T_g2+n(ii) a Namely the optimal compensation temperature; then at this time equation (1) becomes T_f＝T_{Big (a)}+T_c+T_g2+n(ii) a N is greater than or equal to 1;

if at T_f2Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is unqualified; further adopt a value higher than T_g2Compensated temperature T of_g3Instead of T_g2Substituted into equation (1) to calculate and determine a temperature T_f3(ii) a And at T_f3Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is qualified; then at T_f2And T_f3From low to highSelecting an experiment temperature; until a qualified product is obtained, the compensation temperature of the obtained qualified product is T_g3+n(ii) a Namely the optimal compensation temperature; then at this time equation (1) becomes T_f＝T_{Big (a)}+T_c+T_g3+n(ii) a N is greater than or equal to 1; if T is_fiProducing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is unqualified; continuing to increase the compensation temperature until the obtained product is qualified; at this time, the compensation temperature is T_gi(ii) a Then at T_{gi and}T_gi-1in the formed interval, the experiment temperature is selected from low to high; until a qualified product is obtained, the compensation temperature of the obtained qualified product is T_gi+nThe optimum compensation temperature is obtained; then at this time equation (1) becomes T_f＝T_{Big (a)}+T_c+T_gi+n(ii) a I is not less than 3, and n is not less than 1.

The invention relates to a method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool by using ferroalloy smelting waste slag, which is characterized in that a hot wire device is used for measuring a ferroalloy slag melting temperature interval, wherein the ferroalloy slag melting temperature interval is from the ferroalloy slag melting starting temperature to the complete melting temperature; the hot wire utilizing device has the functions of real-time imaging and temperature measurement. The start melting temperature and the complete melting temperature of the ferroalloy slag are determined. The method is not restricted by the type of hot wire equipment.

The invention relates to a method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool by using ferroalloy smelting waste slag.

The invention relates to a method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool by using ferroalloy smelting waste slag, wherein a 135-degree tangent line is tangent to a temperature-viscosity curve on the temperature-viscosity curve of the obtained ferroalloy smelting waste slag, and the tangent point temperature is the corresponding melting temperature T_b。

The invention relates to a method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool from ferroalloy smelting waste slag, wherein the ferroalloy smelting waste slag is selected from one of waste slag generated in a silicomanganese alloy smelting process, waste slag generated in a ferronickel alloy smelting process and blast furnace slag.

The invention relates to a method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool by using ferroalloy smelting waste slag_iComplete melting temperature T_a) The method comprises the following specific operations: onset of melting temperature T_iThe temperature corresponding to the moment when the liquid phase of the ferroalloy slag in the hot wire begins to generate, the complete melting temperature T_aThe temperature corresponding to the moment when the ferroalloy slag is completely in the liquid phase.

In the present invention T_a、T_bCan be obtained by a small trial.

The invention relates to a method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool by using ferroalloy smelting waste slag, wherein the difference temperature T is_cThe specific operation of the determination is as follows: the difference between the melting heat preservation temperature of the ferroalloy slag and the temperature measured by the infrared probe. In the present invention, T is obtained by one measurement_cAfter that, consider T_cIs a constant value. Because the model and the relative position of the equipment are completely fixed when the equipment is applied to a factory, the temperature drop of the equipment is generally not changed greatly when the equipment is guided to a roller or a nozzle although the temperature of the equipment is different during the melting and heat preservation. In order to reduce the rapid attainment of the lowest melting end point temperature, it is considered to be a constant value in the present invention.

The invention firstly obtains the complete melting temperature T_aObtaining the melting temperature T of the ferroalloy smelting waste residue_bThen comparing the two, taking the larger value T of the two_{Big (a)}As a reference for the next operation, T is obtained through one experiment_c(ii) a Then searching for the optimal compensation temperature through an experiment and iteration method; according to T_{Big (a)}+T_cCalculating the lowest melting end point temperature in the process of producing qualified mineral wool by using the optimal compensation temperature; then verifying whether the lowest melting end point temperature can produce qualified slag wool or not; if not, the optimal compensation temperature obtained in the previous step is increased again to carry out verification experiment until qualified mineral wool is obtainedAt this time, the corresponding compensation temperature is the optimal compensation temperature.

Principles and advantages

The invention principle is as follows:

the temperature of the iron alloy slag in the electric furnace is not as high as possible in view of power consumption, loss of refractory, and production efficiency. On the contrary, on the premise of ensuring the quality production of the mineral wool, the lower the end point melting temperature, the more the economical efficiency of the production process can be ensured. The invention scientifically and accurately measures the melting temperature, the melting property temperature and other data of the slag by utilizing hot wire equipment and viscosity equipment; meanwhile, the temperature difference between the slag temperature in the electric furnace and the fiber forming temperature of the centrifugal roller or the airflow jet outlet area is measured by utilizing a preliminary experiment; and finally, searching the optimal compensation temperature by using an iterative method, and obtaining a calculation method and a formula for calculating the minimum production slag wool melting temperature. The method can scientifically and accurately obtain the lowest melting end point temperature in the process of producing qualified mineral wool from the ferroalloy smelting waste slag, thereby ensuring the high-quality production of the mineral wool and reducing the energy consumption and the cost in the production process.

The advantages of the invention are as follows:

1. accurate slag base temperature data is obtained. The slag temperature data based on the melting temperature, the solubility temperature, the difference temperature existing in the process and the like of the slag are obtained by utilizing equipment and methods such as hot wire equipment, viscosity equipment, pre-experiments and the like.

2. A calculation method and a formula of the minimum production slag wool melting temperature are established. The optimal compensation temperature is scientifically found out by utilizing an iterative method, and a calculation method and a formula for calculating the minimum production slag wool melting temperature are obtained through comprehensive analysis.

3. The power consumption is saved, and the refractory material and the electrode loss are reduced. The power consumption, the wear of the refractory and the wear of the electrode mainly depend on the temperature of the ferroalloy slag and the running time of the electric furnace, the accurate end point melting temperature can ensure that the temperature is as low as possible, the melting time is reduced, and the corrosion of the refractory caused by high-temperature slag is reduced.

Drawings

FIG. 1 is a schematic illustration of the blowing process for producing mineral wool in examples 1 and 2 of the present invention;

FIG. 2 shows the melting temperature range of the ferronickel slag measured by the hot wire device in examples 1 and 2 of the present invention;

FIG. 3 shows the melting temperature of ferronickel slag measured by the viscosity device in examples 1 and 2 of the present invention

FIG. 4 is a schematic illustration of the centrifugal process for producing mineral wool in examples 3 and 4 of the present invention;

FIG. 5 shows the melting temperature range of the silicomanganese slag measured by the hot wire device in examples 3 and 4 of the present invention;

FIG. 6 shows the melting temperature of the silicomanganese slag measured by the viscosity measuring device in examples 3 and 4 of the invention

Detailed Description

Ferronickel smelting waste residue and silicomanganese smelting waste residue are used as raw materials, and a spraying method and a centrifugal method are respectively used for carrying out experiments and production practices for producing mineral wool. The main components of the ferronickel slag and the silicomanganese slag are shown in tables 1 and 2. The invention is further illustrated by the following schematic and specific examples.

TABLE 1 main Components of ferronickel slag

FeO	SiO2	CaO	MgO	Al2O3	Cr2O3
						6.71	48.41	5.45	30.07	4.21	1.54

TABLE 2 main composition of silicomanganese slag

SiO2	Al2O3	CaO	MnO	MgO	FeO
						39.83	18.65	19.97	8.84	6.51	1.28

Example 1 (corresponding to case 1-1)

The implementation refers to the situation of producing mineral wool by using ferronickel slag as a raw material and utilizing an injection process, and takes part in figure 1. Measuring basic temperature: taking ferronickel smelting waste residues as raw materials, and respectively carrying out ferronickel slag melting temperature interval and melting temperature by utilizing hot wire equipment and a high-temperature melt viscometerThe measurement of (1) shows that the melting start temperature of the ferronickel slag is T_i1346 ℃ and a complete melting temperature T_a1509 deg.C, melting temperature T_b1431 ℃, see fig. 2 and 3. Measuring the differential temperature in a preliminary experiment: melting the nickel-iron slag in an electric furnace to 1709 deg.C, maintaining the temperature for 3min, reversing the furnace to remove slag, blowing to form cotton at 0.55Mpa, detecting the fiber forming temperature of the blowing port with infrared probe of 1628 deg.C, and calculating to obtain difference temperature T_cThe detected slag wool quality is qualified when the temperature is 81 ℃, so that the difference temperature of the batch and the equipment under the process condition is determined as T_c81 ℃. Determining the optimal compensation temperature: setting T_g1＝40℃，T_f1＝T_{Big (a)}+T_c+T_g1The temperature is 1509+81+40 ═ 1630 ℃, and the quality of the mineral wool is qualified; let T_g2＝30℃，T_f2＝T_{Big (a)}+T_c+T_g2The quality of the slag wool is qualified when the temperature is 1509+81+ 20-1620 ℃; t is_g3＝10℃，T_f3＝T_{Big (a)}+T_c+T_g3The slag wool quality is unqualified when the temperature is 1509+81+ 10-1600 ℃; at T_f2And T_f3Selecting the temperature from low to high for re-testing; let T_g3+1＝15℃，T_f＝T_{Big (a)}+T_c+T_g2+11605 deg.C, unqualified quality of mineral wool; let T_g3+2＝20℃，T_f＝T_{Big (a)}+T_c+T_g2+2The quality of the slag wool is qualified when the temperature is 1610 ℃; t is_g3+2At 20 deg.C, T is the optimum compensation temperature_f＝T_{Big (a)}+T_c+T_g3+21610 ℃. EXAMPLE Mass production: and (3) calculating the melting end point temperature of the same batch of ferronickel slag raw materials according to a formula to be 1610 ℃, and performing mineral wool production by using other process parameters and processes, wherein the product is qualified after detection. The quality detection standard and requirement of the mineral wool conform to the national standard GB/T11835-2016.

Example 2 (corresponding to cases 1-2)

The implementation refers to the situation of producing mineral wool by using ferronickel slag as a raw material and utilizing an injection process, and takes part in figure 1. Measuring basic temperature: hot wire equipment utilizing ferronickel smelting waste residues as raw materialsAnd a high-temperature melt viscosity meter is used for respectively measuring the melting temperature interval and the melting temperature of the ferronickel slag, and the measured result shows that the melting temperature of the ferronickel slag is T_i1346 ℃ and a complete melting temperature T_a1509 deg.C, melting temperature T_b1431 ℃, see fig. 2 and 3. Measuring the differential temperature in a preliminary experiment: melting the nickel-iron slag in an electric furnace to 1709 deg.C, maintaining the temperature for 3min, reversing the furnace to remove slag, blowing to form cotton at 0.55Mpa, detecting the fiber forming temperature of the blowing port with infrared probe of 1628 deg.C, and calculating to obtain difference temperature T_cThe detected slag wool quality is qualified when the temperature is 81 ℃, so that the difference temperature under the conditions of the batch, the equipment and the process is determined as T_c81 ℃. Determining the optimal compensation temperature: setting T_g1＝40℃，T_f1＝T_{Big (a)}+T_c+T_g1The temperature is 1509+81+40 ═ 1630 ℃, and the quality of the mineral wool is qualified; let T_g2＝10℃，T_f2＝T_{Big (a)}+T_c+T_g2The slag wool quality is unqualified when the temperature is 1509+81+ 10-1600 ℃; at T_f1And T_f2Selecting the temperature from low to high for re-testing; let T_g2+1＝15℃，T_f＝T_{Big (a)}+T_c+T_g2+11605 deg.C, unqualified quality of mineral wool; let T_g2+2＝20℃，T_f＝T_{Big (a)}+T_c+T_g2+2The quality of the slag wool is qualified when the temperature is 1610 ℃; t is_g2+2At 20 deg.C, T is the optimum compensation temperature_f＝T_{Big (a)}+T_c+T_g2+21610 ℃. EXAMPLE Mass production: and (3) calculating the melting end point temperature of the same batch of ferronickel slag raw materials according to a formula to be 1610 ℃, and performing mineral wool production by using other process parameters and processes, wherein the product is qualified after detection. The quality detection standard and requirement of the mineral wool conform to the national standard GB/T11835-2016.

Example 3 (corresponding case 2-1)

The implementation is directed to the case of producing mineral wool by using silicomanganese alloy slag as a raw material and utilizing a centrifugal process, and is shown in figure 4. Measuring basic temperature: the melting temperature of the silicomanganese slag is respectively carried out by taking silicomanganese smelting waste slag as raw materials and utilizing hot wire equipment and a high-temperature melt viscometerThe interval and the melting temperature are measured, and the measured result shows that the initial melting temperature of the silicomanganese slag is T_i1220 ℃ and a complete melting temperature T_a1345 ℃ and a melting temperature T_b1370 ℃, see fig. 5 and 6. Measuring the differential temperature in a preliminary experiment: heating and melting silicomanganese slag in an electric furnace to 1570 ℃, preserving heat for 3min, performing inverted furnace deslagging and centrifugal cotton forming operation, wherein the rotating speeds of four rollers are 1#2200r/min, 2#3300r/min, 3#4400r/min and 4#5800r/min respectively, the fiber forming temperature of the 1# centrifugal roller measured by an infrared probe is 1506 ℃, and calculating to obtain a difference temperature T_cThe detected slag wool quality is qualified at 64 ℃, so that the difference temperature under the conditions of the batch, the equipment and the process is determined as T_cAt 64 ℃. Determining the optimal compensation temperature: setting T_g1＝10℃，T_f1＝T_{Big (a)}+T_c+T_g1The slag wool quality is unqualified when the temperature is 1370+64+ 10-1444 ℃; let T_g2＝50℃，T_f2＝T_{Big (a)}+T_c+T_g2When the temperature is 1370+64+50, 1484 ℃, the quality of the mineral wool is qualified; at T_f1And T_f2Selecting the temperature from low to high for re-testing; let T_g2+1＝15℃，T_f＝T_{Big (a)}+T_c+T_g2+11449 ℃, and the quality of the mineral wool is unqualified; let T_g2+2＝20℃，T_f＝T_{Big (a)}+T_c+T_g2+2The quality of the mineral wool is unqualified at 1454 ℃; let T_g2+3＝25℃，T_f＝T_{Big (a)}+T_c+T_g2+3The quality of the mineral wool is qualified at 1459 ℃; t is_g2+5At 25 deg.C, T is the optimum compensation temperature_f＝T_{Big (a)}+T_c+T₂₊₃1459 ℃. EXAMPLE Mass production: and (3) calculating the melting end point temperature of 1459 ℃ according to a formula aiming at the same batch of silicomanganese slag raw materials, and carrying out mineral wool production by using other process parameters and processes as above, wherein the product is qualified after detection. The quality detection standard and requirement of the mineral wool conform to the national standard GB/T11835-2016.

Example 4 (corresponding to case 2-2)

The implementation is directed to the case of producing mineral wool by using silicomanganese alloy slag as a raw material and utilizing a centrifugal process, and is shown in figure 4.Measuring basic temperature: the melting temperature interval and the melting property temperature of the silicomanganese slag are respectively measured by using silicomanganese smelting waste slag as a raw material by using hot wire equipment and a high-temperature melt viscometer, and the measurement result shows that the melting starting temperature of the silicomanganese slag is T_i1220 ℃ and a complete melting temperature T_a1345 ℃ and a melting temperature T_b1370 ℃, see fig. 5 and 6. Measuring the differential temperature in a preliminary experiment: heating and melting silicomanganese slag in an electric furnace to 1570 ℃, preserving heat for 3min, performing inverted furnace deslagging and centrifugal cotton forming operation, wherein the rotating speeds of four rollers are 1#2200r/min, 2#3300r/min, 3#4400r/min and 4#5800r/min respectively, the fiber forming temperature of the 1# centrifugal roller measured by an infrared probe is 1506 ℃, and calculating to obtain a difference temperature T_cThe detected slag wool quality is qualified at 64 ℃, so that the difference temperature under the conditions of the batch, the equipment and the process is determined as T_cAt 64 ℃. Determining the optimal compensation temperature: setting T_g1＝10℃，T_f1＝T_{Big (a)}+T_c+T_g1The slag wool quality is unqualified when the temperature is 1370+64+ 10-1444 ℃; let T_g2＝20℃，T_f2＝T_{Big (a)}+T_c+T_g2The quality of the slag wool is unqualified when the temperature is 1370+64+ 20-1454 ℃; let T_g3＝30℃，T_f3＝T_{Big (a)}+T_c+T_g3The temperature is 1464 ℃ when the temperature is 1370+64+30, and the quality of the mineral wool is qualified; at T_f2And T_f3Selecting the temperature from low to high for re-testing; let T_g3+1＝25℃，T_f＝T_{Big (a)}+T_c+T_g3+1The quality of the mineral wool is qualified at 1459 ℃; t is_g3+1At 25 deg.C, T is the optimum compensation temperature_f＝T_{Big (a)}+T_c+T₃₊₁1459 ℃. EXAMPLE Mass production: and (3) calculating the melting end point temperature of 1459 ℃ according to a formula aiming at the same batch of silicomanganese slag raw materials, and carrying out mineral wool production by using other process parameters and processes as above, wherein the product is qualified after detection. The quality detection standard and requirement of the mineral wool conform to the national standard GB/T11835-2016.

Claims (5)

1. A method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool by using ferroalloy smelting waste slag,the method is characterized in that: obtaining the complete melting temperature T of the ferroalloy smelting waste residue_aObtaining the melting temperature T of the ferroalloy smelting waste residue_b，

For the same batch of ferroalloy smelting waste slag raw materials, in order to determine the temperature T of molten slag in the electric furnace_dAnd the fibre-forming temperature T of the area of the centrifugal roller or the gas stream outlet_eTemperature difference T between_cCarrying out at least one time of the temperature T of the slag in the electric furnace_dAnd fiber forming temperature T_eTest by T_d-T_e=T_cCalculating to obtain T_c(ii) a When the same batch of ferroalloy smelting waste slag raw materials are tested for multiple times, T_dAverage value of multiple tests, T_eAlso the average of a number of tests, said T_dGreater than or equal to T_a+200 ℃ and T_dGreater than or equal to T_b+200 ℃; meanwhile, detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, and if the quality is qualified; then the method is carried out according to the following steps; if not, adjusting T_dUntil the quality of the obtained mineral wool is qualified, the method comprises the following steps:

definition of T_{Big (a)}Is T_a、T_bThe greater of the two;

the melting end point temperature T is calculated by the first theory_f1 Is T_{Big (a)}Plus a difference temperature T_cIn addition to the compensation temperature T_g1I.e. T_f1= T_{Big (a)}+T_c+T_g1(1) (ii) a At this time T_g1Any temperature greater than 0 degrees celsius; the operation then proceeds in two cases:

the first condition is as follows:

heating the same batch of ferroalloy smelting waste residue raw material to T_f1Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is qualified; further use of a value lower than T_g1Compensated temperature T of_g2Instead of T_g1Substituted into equation (1) to calculate and determine a temperature T_f2(ii) a Then heating the same batch of ferroalloy smelting waste residue raw material to T_f2At the temperature, the slag wool is produced and detected according to the national standard GB/T11835-2016The quality of the obtained slag wool is qualified; further use of a value lower than T_g2Compensated temperature T of_g3Instead of T_g2Substituted into equation (1) to calculate and determine a temperature T_f3(ii) a Repeating the operation until the compensation temperature is T_giWhen the quality of the obtained product is not qualified, then at T_giTo T_gi-1In the temperature interval of (3), selecting the experimental temperature from low to high; until a qualified product is obtained, the compensation temperature of the obtained qualified product is T_gi+nThe optimum compensation temperature is obtained; then at this time equation (1) becomes T_f=T_{Big (a)}+T_c+T_gi+n；I is more than 2, and n is more than or equal to 1;

if at T_f2Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is unqualified; then at T_f1And T_f2Selecting the experimental temperature from low to high; until a qualified product is obtained, the compensation temperature of the obtained qualified product is T_g2+n；Namely the optimal compensation temperature; then at this time equation (1) becomes T_f=T_{Big (a)}+T_c+T_g2+n；N is greater than or equal to 1;

case two:

heating the same batch of ferroalloy smelting waste residue raw material to T_f1Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is unqualified; further adopt a value higher than T_g1Compensated temperature T of_g2Instead of T_g1Substituted into equation (1) to calculate and determine a temperature T_f2(ii) a And at T_f2Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is qualified; then at T_f1And T_f2Selecting the experimental temperature from low to high; until a qualified product is obtained, the compensation temperature of the obtained qualified product is T_g2+n；Namely the optimal compensation temperature; then at this time equation (1) becomes T_f=T_{Big (a)}+T_c+T_g2+n；N is greater than or equal to 1;

if at T_f2Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is unqualified; further adopt a value higher than T_g2Compensated temperature T of_g3Instead of T_g2Substituted into equation (1) to calculate and determine a temperature T_f3(ii) a And at T_f3Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is qualified; then at T_f2And T_f3Selecting the experimental temperature from low to high; until a qualified product is obtained, the compensation temperature of the obtained qualified product is T_g3+n(ii) a Namely the optimal compensation temperature; then at this time equation (1) becomes T_f=T_{Big (a)}+T_c+T_g3+n；N is greater than or equal to 1; if T is_f3Producing the mineral wool at the temperature, and detecting the quality of the obtained mineral wool according to the national standard GB/T11835-2016, if the quality is unqualified; continuing to increase the compensation temperature until the obtained product is qualified; at this time, the compensation temperature is T_gi；Then at T_giAnd T_gi-1In the formed interval, the experiment temperature is selected from low to high; until a qualified product is obtained, the compensation temperature of the obtained qualified product is T_gi+nThe optimum compensation temperature is obtained; then at this time equation (1) becomes T_f=T_{Big (a)}+T_c+T_gi+n；The i is more than 3, and the n is more than or equal to 1.

2. The method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool from ferroalloy smelting waste slag according to claim 1, which is characterized in that: measuring a melting temperature range of the ferroalloy smelting waste slag by using hot wire equipment, wherein the melting temperature range of the ferroalloy smelting waste slag is from the melting starting temperature of the ferroalloy slag to the complete melting temperature; the hot wire equipment has the functions of real-time imaging and temperature measurement; and determining the initial melting temperature and the complete melting temperature of the ferroalloy smelting waste residue.

3. The method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool from ferroalloy smelting waste slag according to claim 1, which is characterized in that: measuring a temperature-viscosity curve of the ferroalloy smelting waste residue by using a slag viscosity measuring instrument; and calculating the melting temperature of the waste slag from the smelting of the iron alloy according to the temperature-viscosity curve.

4. The method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool by using the ferroalloy smelting waste slag according to claim 3, which is characterized in that: on the temperature-viscosity curve of the obtained ferroalloy smelting waste residue, a 135-degree tangent line is tangent to the temperature-viscosity curve, and the temperature of the tangent point is the corresponding melting temperature T_b。

5. The method for obtaining the lowest melting end point temperature in the process of producing qualified slag wool from ferroalloy smelting waste slag according to claim 1, which is characterized in that: the ferroalloy smelting waste residue is selected from one of waste residue generated in a silicomanganese alloy smelting process, waste residue generated in a ferronickel alloy smelting process and blast furnace slag.

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