CN113736932A - Preparation method of carbon-iron composite furnace charge - Google Patents
Preparation method of carbon-iron composite furnace charge Download PDFInfo
- Publication number
- CN113736932A CN113736932A CN202010477649.8A CN202010477649A CN113736932A CN 113736932 A CN113736932 A CN 113736932A CN 202010477649 A CN202010477649 A CN 202010477649A CN 113736932 A CN113736932 A CN 113736932A
- Authority
- CN
- China
- Prior art keywords
- coal
- mixed material
- carbon
- ore powder
- iron ore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 37
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 147
- 239000000463 material Substances 0.000 claims abstract description 120
- 239000003245 coal Substances 0.000 claims abstract description 102
- 229910052742 iron Inorganic materials 0.000 claims abstract description 72
- 239000000843 powder Substances 0.000 claims abstract description 64
- 238000002156 mixing Methods 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000011068 loading method Methods 0.000 claims abstract description 9
- 238000003892 spreading Methods 0.000 claims abstract description 3
- 230000007480 spreading Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 18
- 238000000197 pyrolysis Methods 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 7
- 229910052681 coesite Inorganic materials 0.000 claims description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 229910052682 stishovite Inorganic materials 0.000 claims description 6
- 229910052905 tridymite Inorganic materials 0.000 claims description 6
- 230000009257 reactivity Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 23
- 230000008569 process Effects 0.000 description 14
- 239000007789 gas Substances 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 239000003034 coal gas Substances 0.000 description 11
- 239000000571 coke Substances 0.000 description 11
- 238000004939 coking Methods 0.000 description 11
- 230000000630 rising effect Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 9
- 238000003763 carbonization Methods 0.000 description 7
- 238000011282 treatment Methods 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
- B30B11/04—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with a fixed mould
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/212—Sintering; Agglomerating in tunnel furnaces
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
- Tunnel Furnaces (AREA)
Abstract
The invention discloses a preparation method of a carbon-iron composite furnace charge, which comprises the following steps of 1: drying and dewatering the iron ore powder; step 2: screening iron ore powder, and using the undersize iron ore powder as a material; and step 3: crushing the basic blended coal, and mixing the crushed basic blended coal with the iron ore powder under the sieve to form a mixed material; and 4, step 4: loading the mixed material into a plurality of coal charging trolleys and pressing, spreading a layer of coke powder on the surface of the pressed mixed material, and covering the coal charging trolleys; and 5: sliding the coal charging trolley filled with the mixed material into a microwave tunnel kiln, and dynamically heating the mixed material; step 6: and after the mixed material is heated and leaves the microwave tunnel kiln, directly pouring the mixed material into a material tank and cooling to obtain the carbon-iron composite furnace charge. The high-reaction carbon-iron composite furnace charge with good quality and performance is prepared by mixing iron ore powder and blending coal and is used in blast furnace production, so that the production yield is improved, and the emission and the blast furnace consumption are reduced.
Description
Technical Field
The invention relates to a preparation method of furnace charge, in particular to a preparation method of carbon-iron composite furnace charge.
Background
The blast furnace-converter process is the main process of steel production, and the blast furnace ironmaking CO in the process2The discharge amount and the energy consumption respectively account for more than 80 percent and 70 percent of the whole process. With the increasing environmental problems such as global warming, the steel industry has CO2The emission of CO2More than 15% of the total emission, iron and steel enterprises will bear huge carbon emission reduction pressure for a long time. Meanwhile, the ironmaking capacity produced in China every year is over 8 hundred million tons, which puts high requirements on the coke which is a necessary raw material for ironmaking, and with the large consumption of coking coal resources required by coke production, the coking coal resources are less and less, and especially the high-quality coking coal resources are gradually exhausted.
Research shows that iron element and alkali metal element compounds have positive catalytic action on coke gasification reaction and can promote the generation of CO in a blast furnace, so that the reaction of coke and ore in the blast furnace can be promoted, the iron element and alkali metal element compounds can be used as raw materials for refining high-reaction coke, and according to the principle of a Rist operating line (the Rist operating line is a stable model established on the basis of the material balance and the high-temperature-zone heat balance of the whole blast furnace from the thermochemistry perspective), the high-reactivity coke can reduce the temperature of a blast furnace heat storage area, improve the reduction efficiency of a furnace body, improve the utilization rate of coal gas, improve the reduction degree of ore, and further reduce the coke ratio and the production cost of the blast furnace.
At present, all the iron coke production methods in the prior art are manufactured by hot pressing, a large amount of energy is consumed in the hot pressing process, the control requirement is very high, the operation difficulty is high, the production process flow is long, and the problems of environmental pollution and the like are also caused. The hot-pressed iron coke is carbonized by a shaft furnace, the shaft furnace carbonization is divided into internal heating type and external heating type carbonization, the indirect heat transfer efficiency of the external heating type carbonization is low, and the productivity is very low; the internal heating type carbonization easily causes the material to be dissolved and damaged due to the direct contact of gas and the material, so that the material strength is poor, and the furnace atmosphere is difficult to control in the material heating process.
Disclosure of Invention
The invention aims to provide a preparation method of a carbon-iron composite furnace charge, which is used for preparing a high-reaction carbon-iron composite furnace charge with good quality and performance by mixing iron ore powder and blending coal, and is used in blast furnace production, so that the production yield is improved, and the emission and the blast furnace consumption are reduced.
The invention is realized by the following steps:
a preparation method of a carbon-iron composite furnace charge comprises the following steps:
step 1: drying and dewatering the iron ore powder;
step 2: screening the dried iron ore powder, and using the iron ore powder as a material;
and step 3: crushing the basic blended coal, and uniformly stirring and mixing the crushed basic blended coal and the sieved iron ore powder to form a mixed material;
and 4, step 4: loading the mixed material into a plurality of coal charging trolleys and pressing, spreading a layer of coke powder on the surface of the mixed material after the loading and pressing are finished, and covering the coal charging trolleys;
and 5: sliding the coal charging trolley filled with the mixed material into a microwave tunnel kiln, and dynamically heating the mixed material through microwaves while the coal charging trolley slides;
step 6: and after the mixed material is heated and leaves the microwave tunnel kiln, directly pouring the mixed material into a material tank and cooling to obtain the carbon-iron composite furnace charge.
In the step 1, the iron ore powder includes: according to mass percentage, 0.4 to 0.5 percent of CaO, 61 to 66 percent of TFe, 0.4 to 0.5 percent of MgO, and 4 to 5 percent of SiO 2.
In the step 1, the moisture content of the dried iron ore powder is less than 0.8%.
In the step 2, the particle size of the undersize iron ore powder is less than 0.12 mm.
In the step 3, the iron ore powder accounts for 12-28% of the mixture material, and the basic blending coal accounts for 72-88% of the mixture material according to the mass percentage.
In the step 3, the granularity of the basic blended coal is less than 5mm, and the granularity of the crushed basic blended coal is less than 3 mm; volatile matter VM of basic blending coald18-21% of ash content Ad7-9%; in the basic blending coal, the proportion of fat coal is as follows according to the mass percentage15-20%。
In the step 4, the bulk density of the pressed mixed material is 800-1000kg/m 3.
In the step 5, the microwave tunnel kiln comprises a kiln temperature rise section and a kiln constant temperature section, the microwave power of the microwave tunnel kiln is 6000-6250kw, the frequency is 915MHz, the temperature of the mixed material on the coal charging trolley is raised to 700-780 ℃ at the temperature rise speed of 3-5 ℃/min in the kiln temperature rise section, and the temperature is raised to 1000 ℃ at the temperature rise speed of 7 ℃/min in the kiln constant temperature section, and then the temperature is kept for 2-3h at the temperature of 1000 ℃.
In the steps 4 and 5, a suction device is arranged at the top of the coal charging trolley and used for sucking gas generated by coal pyrolysis in the mixed material.
The compressive strength of the carbon-iron composite furnace charge is 3270-3340N, the reactivity CRI is 39-44%, and the strength CSR after reaction is 12-23%.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the dried and screened iron ore powder and the basic blended coal are mixed and sent into the microwave tunnel kiln by using the coal charging trolley for microwave carbonization treatment, so that the problem that the iron ore powder can only be used for sintering or pelletizing is solved, the complicated hot-shaped ball pressing process required by the conventional iron coke preparation is also omitted, the problem of shortage of coking coal caused by large consumption of a large amount of coke due to huge steel productivity can be effectively solved, a new processing and utilizing method is provided for the iron ore powder, and a new using method is provided for the coking coal with low metamorphism degree.
2. The invention fully utilizes iron and oxides thereof in the iron ore, effectively utilizes coking coal with low metamorphism degree or weak caking coal, and ensures the full fusion and caking between iron ore powder and coal material by adding a certain amount of fat coal, thereby ensuring the strength of the generated carbon-iron composite furnace charge.
3. According to the invention, the microwave tunnel kiln is used for dynamically heating the mixed material, so that not only can continuous batch production be realized, the practicability is strong, but also the problem that the strength of the material is greatly reduced due to the reaction of oxidizing gas and the material when the gas and the material are contacted during carbonization of the internal heating type shaft furnace can be effectively avoided, the problem that the material is pulverized due to mutual extrusion and friction between the materials caused by continuous movement of the material during carbonization of the shaft furnace can be avoided, meanwhile, the problem that the material is difficult to discharge after being bonded can be avoided, and the yield and the quality of finished products can be improved.
4. The carbon-iron composite furnace charge prepared by the method has good quality and performance, can be applied to blast furnace production, improves the reduction efficiency of a furnace body, promotes the generation of a large amount of CO in the coking process, reduces the consumption of coking coal, and effectively reduces the CO in the iron-making process2Discharging, reducing the cost of the coking process and the blast furnace production process, thereby improving the environmental benefit and the economic benefit.
5. The invention can collect pyrolysis gas when heating materials, and improve the utilization rate of the gas.
The invention utilizes the characteristic of high content of oxides in iron ore powder to prepare the high-reaction carbon-iron composite furnace charge with good quality and performance by mixing the iron ore powder and the blending coal, and the high-reaction carbon-iron composite furnace charge can increase the molten iron yield of a blast furnace and reduce CO in the coking and iron-making processes when used for the blast furnace production2The discharge and the production cost are reduced, the consumption of coking coal resources is saved, and the method has good environmental benefit and economic benefit.
Drawings
FIG. 1 is a flow chart of the preparation method of the carbon-iron composite burden of the invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, a method for preparing a carbon-iron composite furnace charge includes the following steps:
step 1: drying and dewatering iron ore powder from a production plant, wherein the iron ore powder comprises: 0.4-0.5% CaO, 61-66% TFe (TFe mainly comes from Fe) by mass percentage2O3And Fe3O4Iron content in the composition, not excluding other iron compounds or impurities), 0.4-0.5% MgO, 4-5% SiO2。
The method for drying precipitation comprises the following steps: and (3) putting the iron ore powder into a drying box for ventilation drying treatment, preferably, the moisture content of the dried iron ore powder is less than 0.8%, which is beneficial to screening the iron ore powder.
Step 2: and (3) screening the dried iron ore powder, namely taking a certain amount of the dried iron ore powder, and screening the iron ore powder by using a circular hole screen, wherein undersize iron ore powder with the granularity of less than 0.12mm is used as a material, and large-particle oversize materials are removed, so that the iron ore powder is favorably and uniformly dispersed in the blended coal, and the quality of the carbon-iron composite furnace burden is ensured.
And step 3: crushing the basic blended coal from a production plant, and uniformly stirring and mixing the crushed basic blended coal and the sieved iron ore powder to form a mixed material. According to the mass percentage, the iron ore powder in the mixture accounts for 12-28%, and the basic blending coal accounts for 72-88%.
The granularity of the basic blended coal is less than 5mm, the basic blended coal can be crushed by a crusher, and the granularity of the crushed basic blended coal is less than 3 mm. Volatile matter VM of basic blending coald18-21% of ash content Ad7-9%; in the basic blended coal, the proportion of fat coal is 15-20% by mass percent, and the rest of the basic blended coal has no requirements on the coal types and the proportions thereof.
And 4, step 4: loading the mixed material, namely loading the mixed material after being fully crushed and mixed into a plurality of coal charging trolleys and pressing, wherein the bulk density of the mixed material can be controlled to be 800-1000kg/m3The surface of the mixed material after the loading and pressing is paved with a layer of coke powder to isolate the material from air, thereby effectively avoiding the problem of material strength reduction caused by the reaction of the air and the material, and then the cover of the coal loading trolley is covered to prepare for heating.
And 5: the miscella on the dolly of charging is carbonized, passes through the track slip to the microwave tunnel kiln with the dolly of charging that will fill the miscella promptly, and the microwave through the microwave tunnel kiln carries out the dynamic heating to the miscella when the dolly of charging slides, and the microwave power of microwave tunnel kiln is 6000 and adds 6250kw, and the frequency is 915 MHz. The yield per day can reach 30 t.
The microwave tunnel kiln comprises a kiln temperature rising section from a kiln inlet to the middle of the kiln and a kiln constant temperature section from the middle of the kiln to a kiln outlet, preferably, the temperature of the mixed material on the coal charging trolley is raised from normal temperature to 700-780 ℃ in the kiln temperature rising section at the temperature rising speed of 3-5 ℃/min, the temperature of the mixed material on the coal charging trolley is raised to 1000 ℃ in the kiln constant temperature section at the temperature rising speed of 7 ℃/min, then the temperature is kept at 1000 ℃, and the constant temperature time is preferably 2-3 h. In the kiln temperature rising section and the kiln constant temperature section, the heating speed of the mixed materials can be controlled by adjusting the microwave heating density of the microwave tunnel kiln, so that the coal charging trolley can realize the dynamic heating of the mixed materials in the forward (i.e. towards the outlet direction of the microwave tunnel kiln) moving process.
The top of the coal charging trolley is provided with a suction device for sucking gas generated by coal pyrolysis in the mixed material, the sucked pyrolysis gas can be uniformly subjected to primary treatment through a gas treatment process, the coal charging trolley can be applied to other purposes, and each ton of the mixed material can generate 173.4-209.3m3The coal gas is pyrolyzed, and the utilization rate of the coal gas is effectively improved.
Step 6: and after the mixed material is heated and leaves the microwave tunnel kiln, the mixed material is directly poured into the material tank, nitrogen is filled for cooling the material tank to obtain the carbon-iron composite furnace charge, and the nitrogen after heat exchange can be recycled and reused after cooling.
The quality detection of the carbon-iron composite furnace charge prepared by the method can ensure that the compressive strength of the carbon-iron composite furnace charge can reach 3270-3340N, the reactivity CRI can reach 39-44%, and the post-reaction strength CSR can reach 12-23%.
Example 1:
the iron ore powder adopted in the embodiment comprises the following components in percentage by mass: 0.4% CaO, 61% TFe, 0.4% MgO, 4% SiO2. Drying iron ore powder from a production plant, wherein the moisture content of the dried iron ore powder is less than 0.8%, screening by using a round hole screen after drying, and using the screened iron ore powder with the granularity of less than 0.12mm as a use material.
Mixing basic coal (ash A) with particle size less than 5mm from production plantd=9% volatile matter VMd=18%) is added into a crusher for mechanical crushing, the particle size after crushing is less than 3mm, and the addition of fat coal in basic blending coalThe content is 20%. Mechanically stirring the sieved iron ore powder and the crushed basic blending coal, and uniformly mixing to obtain a mixed material, wherein the usage amount of the iron ore powder is 12% and the usage amount of the basic blending coal is 88% by mass percentage. Adding the mixed material into a coal charging trolley, and controlling the bulk density of the mixed material to be 1000kg/m by pressing3And a layer of coke powder is laid on the surface of the mixed material and the cover of the coal charging trolley is covered.
Moving the coal charging trolley to a microwave tunnel kiln (the microwave power is 6000kw, the frequency is 915MHz, the daily output is 30 t) through a track, dynamically heating the mixed material, controlling the heating rate of the mixed material to be 3 ℃/min in a kiln heating section, heating the mixed material to 780 ℃ from normal temperature, controlling the heating rate of the mixed material to be 7 ℃/min in a kiln constant temperature section through controlling the microwave heating density, and keeping the temperature for 3 hours at 1000 ℃ after the temperature of the mixed material reaches 1000 ℃. And after the mixture is discharged from the furnace, pouring the mixture into a material tank, and cooling the mixture by using nitrogen. The pyrolysis gas generated during the heating of the mixed material was about 173.4 m3And/t, the pyrolysis coal gas is collected by a suction device and can be directly used for other purposes after being treated by a coal gas treatment process.
And (4) carrying out quality detection on the cooled carbon-iron composite furnace burden. The detection result is as follows: compressive strength was 3329N, reactivity CRI 39%, and post-reaction strength CSR 22%.
Example 2:
the iron ore powder adopted in the embodiment comprises the following components in percentage by mass: 0.45% CaO, 63% TFe, 0.45% MgO, 5% SiO2. Drying iron ore powder from a production plant, wherein the moisture content of the dried iron ore powder is less than 0.8%, screening by using a round hole screen after drying, and using the screened iron ore powder with the granularity of less than 0.12mm as a use material.
Mixing basic coal (ash A) with particle size less than 5mm from production plantd=8%, volatile matter VMdAnd =19%) of the raw materials are added into a crusher to be mechanically crushed, the particle size after crushing is less than 3mm, and the adding proportion of the fat coal in the basic blending coal is 18%. Mechanically stirring the sieved iron ore powder and the crushed basic mixed coal, and uniformly mixing to obtain a mixed material according to mass percentageThe usage amount of the iron ore powder is 18 percent, and the usage amount of the basic blending coal is 82 percent. Adding the mixed material into a coal charging trolley, and controlling the bulk density of the mixed material to be 900kg/m by pressing3And a layer of coke powder is laid on the surface of the mixed material and the cover of the coal charging trolley is covered.
The coal charging trolley is moved into a microwave tunnel kiln (the microwave power is 6000kw, the frequency is 915MHz, the daily output is 30 t) through a track, the mixed material is dynamically heated, in a kiln heating section, the temperature rising speed of the mixed material is controlled to be 4 ℃/min, the mixed material is heated to 750 ℃ from the normal temperature, in a kiln constant temperature section, the temperature rising speed of the mixed material is controlled to be 7 ℃/min through controlling the microwave heating density, and when the temperature of the mixed material reaches 1000 ℃, the temperature is kept for 2.5 hours at the temperature of 1000 ℃. And after the mixture is discharged from the furnace, pouring the mixture into a material tank, and cooling the mixture by using nitrogen. The pyrolysis gas generated during the heating of the mixed material is about 185 m3And/t, the pyrolysis coal gas is collected by a suction device and can be directly used for other purposes after being treated by a coal gas treatment process.
And (4) carrying out quality detection on the cooled carbon-iron composite furnace burden. The detection result is as follows: compressive strength was 3307N, reactive CRI was 40.5%, and post-reaction strength CSR was 19.3%.
Example 3:
the iron ore powder adopted in the embodiment comprises the following components in percentage by mass: 0.5% CaO, 65% TFe, 0.5% MgO, 5% SiO2. Drying iron ore powder from a production plant, wherein the moisture content of the dried iron ore powder is less than 0.8%, screening by using a round hole screen after drying, and using the screened iron ore powder with the granularity of less than 0.12mm as a use material.
Mixing basic coal (ash A) with particle size less than 5mm from production plantd=7% volatile matter VMd=20%) is added into a crusher to be mechanically crushed, the particle size after crushing is less than 3mm, and the addition proportion of the fat coal in the basic blending coal is 16%. Mechanically stirring the sieved iron ore powder and the crushed basic blending coal, and uniformly mixing to obtain a mixed material, wherein the usage amount of the iron ore powder is 24% and the usage amount of the basic blending coal is 76% by mass percentage. Adding the mixed materials into a coal charging trolley, and controlling the mixing by pressingThe bulk density of the material is 850kg/m3And a layer of coke powder is laid on the surface of the mixed material and the cover of the coal charging trolley is covered.
The coal charging trolley is moved into a microwave tunnel kiln (the microwave power is 6000kw, the frequency is 915MHz, the daily output is 30 t) through a track, the mixed material is dynamically heated, in a kiln heating section, the temperature rising speed of the mixed material is controlled to be 5 ℃/min, the mixed material is heated to 720 ℃ from the normal temperature, in a kiln constant temperature section, the temperature rising speed of the mixed material is controlled to be 7 ℃/min through controlling the microwave heating density, and when the temperature of the mixed material reaches 1000 ℃, the temperature is kept for 2 hours at the temperature of 1000 ℃. And after the mixture is discharged from the furnace, pouring the mixture into a material tank, and cooling the mixture by using nitrogen. The pyrolysis gas generated in the heating process of the mixed material is about 192.2 m3And/t, the pyrolysis coal gas is collected by a suction device and can be directly used for other purposes after being treated by a coal gas treatment process.
And (4) carrying out quality detection on the cooled carbon-iron composite furnace burden. The detection result is as follows: compressive strength was 3299N, reactive CRI was 41.7%, and post-reaction strength CSR was 15.6%.
Example 4:
the iron ore powder adopted in the embodiment comprises the following components in percentage by mass: 0.5% CaO, 66% TFe, 0.5% MgO, 5% SiO2. Drying iron ore powder from a production plant, wherein the moisture content of the dried iron ore powder is less than 0.8%, screening by using a round hole screen after drying, and using the screened iron ore powder with the granularity of less than 0.12mm as a use material.
Mixing basic coal (ash A) with particle size less than 5mm from production plantd=8%, volatile matter VMd=21%) is added into a crusher for mechanical crushing, the particle size after crushing is less than 3mm, and the adding proportion of the fat coal in the basic blending coal is 15%. Mechanically stirring the undersize iron ore powder and the crushed basic blending coal, and uniformly mixing to obtain a mixed material, wherein the usage amount of the iron ore powder is 28% and the usage amount of the basic blending coal is 72% by mass percentage. Adding the mixed material into a coal charging trolley, and controlling the bulk density of the mixed material to be 800kg/m by pressing3And a layer of coke powder is laid on the surface of the mixed material and the cover of the coal charging trolley is covered.
The coal charging trolley is moved into a microwave tunnel kiln (the microwave power is 6000kw, the frequency is 915MHz, the daily output is 30 t) through a track, the mixed material is dynamically heated, in a kiln heating section, the temperature rising speed of the mixed material is controlled to be 5 ℃/min, the mixed material is heated to 700 ℃ from the normal temperature, in a kiln constant temperature section, the temperature rising speed of the mixed material is controlled to be 7 ℃/min through controlling the microwave heating density, and when the temperature of the mixed material reaches 1000 ℃, the temperature is kept for 2 hours at the temperature of 1000 ℃. And after the mixture is discharged from the furnace, pouring the mixture into a material tank, and cooling the mixture by using nitrogen. Pyrolysis gas generated during heating of the mixed material was about 209.3m3And/t, the pyrolysis coal gas is collected by a suction device and can be directly used for other purposes after being treated by a coal gas treatment process.
And (4) carrying out quality detection on the cooled carbon-iron composite furnace burden. The detection result is as follows: compressive strength was 3283N, reactive CRI 43.4%, and post-reaction strength CSR 12.4%.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of a carbon-iron composite furnace charge is characterized by comprising the following steps: the method comprises the following steps:
step 1: drying and dewatering the iron ore powder;
step 2: screening the dried iron ore powder, and using the iron ore powder as a material;
and step 3: crushing the basic blended coal, and uniformly stirring and mixing the crushed basic blended coal and the sieved iron ore powder to form a mixed material;
and 4, step 4: loading the mixed material into a plurality of coal charging trolleys and pressing, spreading a layer of coke powder on the surface of the mixed material after the loading and pressing are finished, and covering the coal charging trolleys;
and 5: sliding the coal charging trolley filled with the mixed material into a microwave tunnel kiln, and dynamically heating the mixed material through microwaves while the coal charging trolley slides;
step 6: and after the mixed material is heated and leaves the microwave tunnel kiln, directly pouring the mixed material into a material tank and cooling to obtain the carbon-iron composite furnace charge.
2. The method for preparing the carbon-iron composite furnace charge as claimed in claim 1, which is characterized by comprising the following steps: in the step 1, the iron ore powder includes: according to the mass percentage, 0.4 to 0.5 percent of CaO, 61 to 66 percent of TFe, 0.4 to 0.5 percent of MgO and 4 to 5 percent of SiO2。
3. The method for preparing the carbon-iron composite furnace charge as claimed in claim 1, which is characterized by comprising the following steps: in the step 1, the moisture content of the dried iron ore powder is less than 0.8%.
4. The method for preparing the carbon-iron composite furnace charge as claimed in claim 1, which is characterized by comprising the following steps: in the step 2, the particle size of the undersize iron ore powder is less than 0.12 mm.
5. The method for preparing the carbon-iron composite furnace charge as claimed in claim 1, which is characterized by comprising the following steps: in the step 3, the iron ore powder accounts for 12-28% of the mixture material, and the basic blending coal accounts for 72-88% of the mixture material according to the mass percentage.
6. The method for preparing the carbon-iron composite furnace charge as claimed in claim 1, which is characterized by comprising the following steps: in the step 3, the granularity of the basic blended coal is less than 5mm, and the granularity of the crushed basic blended coal is less than 3 mm; volatile matter VM of basic blending coald18-21% of ash content Ad7-9%; in the basic blended coal, the proportion of the fat coal is 15-20% by mass percent.
7. The method for preparing the carbon-iron composite furnace charge as claimed in claim 1, which is characterized by comprising the following steps: in the step 4, the bulk density of the pressed mixed material is 800-3。
8. The method for preparing the carbon-iron composite furnace charge as claimed in claim 1, which is characterized by comprising the following steps: in the step 5, the microwave tunnel kiln comprises a kiln temperature rise section and a kiln constant temperature section, the microwave power of the microwave tunnel kiln is 6000-6250kw, the frequency is 915MHz, the temperature of the mixed material on the coal charging trolley is raised to 700-780 ℃ at the temperature rise speed of 3-5 ℃/min in the kiln temperature rise section, and the temperature is raised to 1000 ℃ at the temperature rise speed of 7 ℃/min in the kiln constant temperature section, and then the temperature is kept for 2-3h at the temperature of 1000 ℃.
9. The method for preparing the carbon-iron composite furnace charge as claimed in claim 1, which is characterized by comprising the following steps: in the steps 4 and 5, a suction device is arranged at the top of the coal charging trolley and used for sucking gas generated by coal pyrolysis in the mixed material.
10. The method for preparing the carbon-iron composite furnace charge as claimed in claim 1, which is characterized by comprising the following steps: the compressive strength of the carbon-iron composite furnace charge is 3270-3340N, the reactivity CRI is 39-44%, and the strength CSR after reaction is 12-23%.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010477649.8A CN113736932A (en) | 2020-05-29 | 2020-05-29 | Preparation method of carbon-iron composite furnace charge |
| KR1020227038719A KR20220156968A (en) | 2020-05-29 | 2021-05-28 | Manufacturing method of load for carbon-iron composite furnace |
| DE112021001552.4T DE112021001552T5 (en) | 2020-05-29 | 2021-05-28 | Carbon-iron composite blast furnace burden manufacturing process |
| JP2022572369A JP7474872B2 (en) | 2020-05-29 | 2021-05-28 | Preparation method for carbon-iron composite furnace charge |
| PCT/CN2021/096681 WO2021239096A1 (en) | 2020-05-29 | 2021-05-28 | Preparation method for carbon-iron composite furnace burden |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010477649.8A CN113736932A (en) | 2020-05-29 | 2020-05-29 | Preparation method of carbon-iron composite furnace charge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113736932A true CN113736932A (en) | 2021-12-03 |
Family
ID=78724799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010477649.8A Pending CN113736932A (en) | 2020-05-29 | 2020-05-29 | Preparation method of carbon-iron composite furnace charge |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP7474872B2 (en) |
| KR (1) | KR20220156968A (en) |
| CN (1) | CN113736932A (en) |
| DE (1) | DE112021001552T5 (en) |
| WO (1) | WO2021239096A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115216320B (en) * | 2022-08-17 | 2023-09-08 | 酒泉钢铁(集团)有限责任公司 | Production method of iron-carbon composite furnace burden |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009047682A2 (en) * | 2007-10-11 | 2009-04-16 | Exxaro Coal (Proprietary) Limited | Coke making |
| US20100263482A1 (en) * | 2009-04-15 | 2010-10-21 | Phoenix Environmental Reclamation | Separator and crusher of minerals with microwave energy and method thereof |
| CN102498190A (en) * | 2009-09-15 | 2012-06-13 | 杰富意钢铁株式会社 | Process for producing ferro coke |
| CN102978320A (en) * | 2012-11-23 | 2013-03-20 | 武钢集团昆明钢铁股份有限公司 | Method for preparing direct-reduction iron by reducing carbon-containing iron ore powder in microwave heating manner |
| JP2013112876A (en) * | 2011-11-30 | 2013-06-10 | Nippon Steel & Sumitomo Metal Corp | Heating reducing device of agglomerate |
| CN106546096A (en) * | 2016-12-02 | 2017-03-29 | 陕西友力实业有限公司 | The product line device and production method of microwave heating production alloy |
| CN107034356A (en) * | 2017-05-09 | 2017-08-11 | 江苏省冶金设计院有限公司 | A kind of method of microwave tunnel kiln reduction apparatus and its smart iron ore of reduction |
| CN110273065A (en) * | 2018-03-14 | 2019-09-24 | 宝山钢铁股份有限公司 | A kind of iron ore microwave sintering method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006104567A (en) | 2004-10-08 | 2006-04-20 | Sumitomo Metal Ind Ltd | Method for manufacturing sintered ore |
| JP5421685B2 (en) | 2009-05-14 | 2014-02-19 | 株式会社神戸製鋼所 | Production method of coal-type agglomerated ore for vertical furnace |
| CN102827624B (en) * | 2011-06-14 | 2014-12-03 | 鞍钢股份有限公司 | Iron coke and production method thereof |
| CN103468287B (en) * | 2013-09-22 | 2014-12-10 | 重庆大学 | Preparation method of high strength-hyper reactivity iron containing coke |
| JP6311420B2 (en) | 2014-04-10 | 2018-04-18 | 新日鐵住金株式会社 | Method for producing reduced iron and solid reduction furnace |
| CN104119939B (en) * | 2014-08-04 | 2016-03-23 | 东北大学 | A kind of ironmaking hot pressing iron coke and preparation method thereof |
| JP6852679B2 (en) | 2018-01-15 | 2021-03-31 | Ｊｆｅスチール株式会社 | Manufacturing method of molded product for ferro-coke and manufacturing method of ferro-coke |
| CN111944937A (en) * | 2019-05-14 | 2020-11-17 | 宝山钢铁股份有限公司 | Preparation method of carbon-iron composite furnace charge |
-
2020
- 2020-05-29 CN CN202010477649.8A patent/CN113736932A/en active Pending
-
2021
- 2021-05-28 JP JP2022572369A patent/JP7474872B2/en active Active
- 2021-05-28 KR KR1020227038719A patent/KR20220156968A/en not_active Application Discontinuation
- 2021-05-28 DE DE112021001552.4T patent/DE112021001552T5/en active Pending
- 2021-05-28 WO PCT/CN2021/096681 patent/WO2021239096A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009047682A2 (en) * | 2007-10-11 | 2009-04-16 | Exxaro Coal (Proprietary) Limited | Coke making |
| US20100263482A1 (en) * | 2009-04-15 | 2010-10-21 | Phoenix Environmental Reclamation | Separator and crusher of minerals with microwave energy and method thereof |
| CN102498190A (en) * | 2009-09-15 | 2012-06-13 | 杰富意钢铁株式会社 | Process for producing ferro coke |
| JP2013112876A (en) * | 2011-11-30 | 2013-06-10 | Nippon Steel & Sumitomo Metal Corp | Heating reducing device of agglomerate |
| CN102978320A (en) * | 2012-11-23 | 2013-03-20 | 武钢集团昆明钢铁股份有限公司 | Method for preparing direct-reduction iron by reducing carbon-containing iron ore powder in microwave heating manner |
| CN106546096A (en) * | 2016-12-02 | 2017-03-29 | 陕西友力实业有限公司 | The product line device and production method of microwave heating production alloy |
| CN107034356A (en) * | 2017-05-09 | 2017-08-11 | 江苏省冶金设计院有限公司 | A kind of method of microwave tunnel kiln reduction apparatus and its smart iron ore of reduction |
| CN110273065A (en) * | 2018-03-14 | 2019-09-24 | 宝山钢铁股份有限公司 | A kind of iron ore microwave sintering method |
Non-Patent Citations (1)
| Title |
|---|
| 李磊等: "微波碳热还原钛铁矿扩试研究", 《材料导报》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112021001552T5 (en) | 2023-01-05 |
| WO2021239096A1 (en) | 2021-12-02 |
| JP2023528313A (en) | 2023-07-04 |
| JP7474872B2 (en) | 2024-04-25 |
| KR20220156968A (en) | 2022-11-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102643997B (en) | Laterite-nickel ore processing method for efficiently recovering nickel resources | |
| CN104119939B (en) | A kind of ironmaking hot pressing iron coke and preparation method thereof | |
| CN108130105B (en) | Metallurgical reduction coupling type coking and carbonization co-terminal coal pyrolysis process and system | |
| CN102586529A (en) | Rotary hearth furnace iron-making method utilizing biomass carbon-containing pellet to serve as raw material | |
| CN103290159A (en) | Method for producing directly-reduced iron powder in microwave heating manner | |
| CN101691621A (en) | Method of producing sponge iron from carbon dedusting ash and iron scales | |
| CN112410547A (en) | Preparation method of composite iron-carbon sintered ore and blast furnace smelting process | |
| CN101538628A (en) | Method for directly reducing laterite-nickel into nickel-bearing ball iron in tunnel kilns | |
| CN112980481A (en) | Method for preparing high-reactivity coke from steel slag | |
| CN113736932A (en) | Preparation method of carbon-iron composite furnace charge | |
| CN112980480A (en) | Method for preparing iron coke from steel slag and iron ore powder | |
| CN111944937A (en) | Preparation method of carbon-iron composite furnace charge | |
| CN108588411B (en) | Preparation method of high-carbon-content metallized briquette for blast furnace | |
| CN105463146A (en) | Method for carrying out direct reduction processing on hematite through rotary hearth furnace to produce granular iron | |
| CN112899471B (en) | Method for preparing large-size composite vanadium-titanium pellet ore | |
| CN103589865B (en) | Method for producing metallized pellets by direct reduction of powdered iron by carbon cycle oxygenation | |
| CN112980479A (en) | Method for preparing iron coke by cold pressing of steel slag and iron ore powder | |
| CN113637510B (en) | Production method of high-value formed coke from waste coke powder | |
| CN111996024B (en) | Method for preparing high-reactivity coke by compounding metallurgical dust and high-sulfur coal and cooperatively removing zinc and sulfur | |
| CN107739819A (en) | A kind of method of coal base shaft furnace process processing iron content red mud | |
| CN112980483A (en) | Method for preparing high-reactivity coke by cold pressing of steel slag | |
| CN105018122B (en) | A kind of formed coke preparation method using COREX pulverized coke instead electric furnace steel making carbon raw materials | |
| CN115612761B (en) | Low-ash high-strength iron coke and preparation method thereof | |
| CN212560387U (en) | Device that hot pressing steel scrap recarburization used | |
| CN115612760B (en) | Low-ash high-strength iron coke and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211203 |