CN1197981C - Method for smelting melted iron with iron-bearing waste cooled agglomerated pellet - Google Patents
Method for smelting melted iron with iron-bearing waste cooled agglomerated pellet Download PDFInfo
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- CN1197981C CN1197981C CN 02110713 CN02110713A CN1197981C CN 1197981 C CN1197981 C CN 1197981C CN 02110713 CN02110713 CN 02110713 CN 02110713 A CN02110713 A CN 02110713A CN 1197981 C CN1197981 C CN 1197981C
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Abstract
The present invention provides a method for smelting melted iron by using the cold bound pellets of iron-containing waste. After the carbon-containing cold bound pellets are made from the iron-containing waste, the carbon containing cold bound pellets are sent into a hearth type reflecting furnace for eliminating the impurities of zinc, etc. by prereduction at the reaction temperature of 950 to 1350 DEG C; the reduced cold bound pellets enters a vertical furnace, the cold bound pellets are melted in the vertical furnace by introducing hot air for heating and cold air for assisting secondary combustion, and coal gas generated in the vertical furnace are respectively supplied to the carbon containing cold bound pellets of the iron-containing waste and the vertical furnace for use. The method has the advantages of effectively utilization of the waste, fuel saving and environmental protection.
Description
Technical Field
The invention relates to a method for smelting molten iron, in particular to a method for smelting molten iron by utilizing iron-containing waste cold-bonded pellets.
Technical Field
In the production of steel, a large amount of various dusts are generated every year, and like 63 million tons of various dusts are generated every year in the production of steel of Baoshan steel shares company, 16 million tons of dusts with high zinc content are not treated, and a proper treatment and utilization method is to be developed.
The usual treatment for all types of dust is recycling, such as back-sintering, but for higher zinc containing dust it is usually discarded or the zinc containing dust is treated by tunnel kiln direct reduction and recycling in the steel production process. However, the method of recycling in the steel production process can only treat a part of dust containing less zinc, and cannot solve the problem of the whole zinc-containing dust. Metallized pellets can be obtained by treating zinc-containing dust by direct reduction methods such as tunnel kilns, rotary hearth furnaces and rotary kilns, but the pellets have high sulfur, zinc (more than 0.3 percent) and gangue content, and are greatly limited in further utilization in blast furnaces, converters and electric furnaces.
Disclosure of Invention
Therefore, the invention aims to provide a method for smelting molten iron by utilizing the iron-containing waste cold-bonded pellets. The method can effectively treat zinc-containing dust and other iron-containing dust which can not be utilized by various blast furnaces, and the dust can be used for producing qualified molten iron, so that the qualified molten iron can be effectively utilized, and the steel production of a main process is not influenced.
A method for smelting molten iron by using iron-containing waste cold-bonded pellets is characterized in that the iron-containing waste cold-bonded carbon-containing pellets are subjected to pre-reduction in a hearth reverberatory furnace through coal gas generated by a shaft furnace to remove impurities such as zinc, lead, potassium, sodium and the like, and the reaction temperature in the hearth reverberatory furnace is 950 ℃ plus 1350 ℃; and (3) feeding the reduced cold-bonded carbon-containing pellets into a vertical furnace, respectively introducing hot air and cold air for assisting secondary combustion into the vertical furnace to melt the cold-bonded carbon-containing pellets in the vertical furnace, and respectively supplying coal gas generated in the vertical furnace to the iron waste cold-bonded carbon-containing pellets and the vertical furnace for use.
Heating hot air introduced into the shaft furnace by using coal gas generated by the shaft furnace, wherein the temperature of the hot air is 1250-. The reaction temperature in the hearth reverberatory furnace is 1050-. The fuel used by the shaft furnace is coke, or blocky anthracite, cold-solidified coal balls, and a part of non-coke coal powder, waste plastic particles, waste tire particles, waste wood particles and the like which are blown. The shaft furnace is provided with double air outlets.
The invention is mainly characterized in that the non-coking coal is used as a main energy source and a reducing agent, the iron-containing waste cold-bonded carbon-containingpellets of a metallurgical plant with higher elements of zinc, lead, potassium, sodium and the like are used, 15-18% of carbon is used as a raw material, so that the elements of zinc, lead, potassium, sodium and the like can be enriched and recovered, and the iron in the iron-containing waste dust is smelted into a qualified iron water product. In the process, firstly, shaft furnace self-produced gas is adopted to carry out rapid pre-reduction, desorption and enrichment recovery on the iron-containing waste dust cold-concretion carbon-containing pellets in a chamber type reverberatory furnace, the reaction temperature is 950 plus-iron 1350 ℃, the best is 1050 plus-iron 1300 ℃, secondly, a shaft furnace with two air vents (the furnace type is similar to an iron-making blast furnace) is adopted to melt and reduce the hot carbon-containing pellets from which the elements such as zinc, lead, potassium, sodium and the like are removed, a part of coke or massive anthracite or cold-concretion coal pellets is used as fuel, a part of carbonaceous fuel such as non-coking coal powder, waste plastic particles, waste tire particles, waste wood particles and the like is simultaneously blown, the gas blown into the shaft furnace from the lower part of the shaft furnace is heated to 1250 plus-iron 1400 ℃, a part of cold air is blown into the middle part of the shaft furnace to assist secondary combustion,
the invention is mainly characterized in that the iron-containing waste dust cold-concretion carbon-containing pellets are quickly pre-reduced and removed and elements such as zinc, lead, potassium, sodium and the like are enriched and recovered in a chamber type reverberatory furnace by adopting self-produced gas, and the chemical reaction is as follows at the temperature of more than 900 ℃:
then, hot air which is used for heating air to 1250-.
The method can effectively treat iron-containing nonferrous metal waste residues, sulfuric acid residues, oil-containing metallurgical slag, dust and the like in iron and steel plants, which have high contents of elements such as zinc, lead, potassium, sodium and the like and are not suitable for blast furnaces, and can recycle valuable elements in the iron and iron-containing metallurgical slag, the dust and the like, so that the solid wastes are harmless and recycled, and iron ore powder can also be used. And social solid wastes such as waste plastic particles, waste tire particles, waste wood particles and the like can be digested by utilizing the high air temperature of the shaft furnace, so that the fuel is saved, and the environment is protected. In the invention, the shaft furnace can be used for producing coal gas to heat air to 1250-; the self-produced gas is completely used for quickly pre-reducing, removing and enriching and recovering elements such as zinc, lead, potassium, sodium and the like of the iron-containing waste dust cold-concreted carbon-containing pellets in a hearth type reverberatory furnace.
The invention adopts the specially designed shaft furnace with two air outlets to melt and reduce the hot carbon-containing pellets from which zinc, lead, potassium, sodium and other elements are removed, thereby greatly improving the productivity of the shaft furnace.
Drawings
FIG. 1 is a process flow diagram of the method of the present invention.
Referring to fig. 1, the method for smelting molten iron by using iron-containing waste cold-bonded pellets comprises the steps of adding anthracite powder or coke powder 2 into iron-containing waste 1 of a metallurgical plant with high content of elements such as zinc, lead, potassium, sodium and the like, introducing coal gas 12 generated by a shaft furnace, and sending the iron-containing waste cold-bonded carbon-containing pellets 3 into a hearth reverberatory furnace 4 for pre-reduction, removal and enrichment recovery of impurities such as zinc, lead, potassium, sodium and the like, wherein the reaction temperature in the hearth reverberatory furnace 4 is 950-1350 ℃; the reduced cold-bonded carbon-containing pellets 3 enter a shaft furnace 6, coke or anthracite or pulverized coal cold-bonded pellets 5 are added into the shaft furnace 6, and an air blower 7 and a hot blast stove 8 are arranged for conveying cold air and hot air for assisting secondary combustion into the shaft furnace 6, wherein the hot air is introduced into the shaft furnace 6 after the coal gas 12 generated by the shaft furnace 6 is heated to 1250 plus 1400 ℃ in the hot blast stove 8, so that the cold-bonded carbon-containing pellets 3 are melted in the shaft furnace 6. Qualified molten iron 9 is produced and slag 10 is removed. The coal gas 13 generated in the shaft furnace 6 is used for cold-concreting the carbon-containing pellets 3 and the shaft furnace 6 respectively by the iron scrap 1 after the coal gas dedusting 11.
Detailed Description
Examples
2.1 tons of iron-containing dust (TFe 50 percent), 0.3 tons of slaked lime and 0.5 tons of coal powder are subjected to cold solidification to form carbon-containing pellets, the cold-solidified carbon-containing pellets enter a chamber type reverberatory furnace for pre-reduction and pre-reduction Zn removal, the metallization rate is about 70 percent, and the reaction temperature in the chamber type reverberatory furnace is controlled at 1050-1300 ℃; 2.9 tons of the cold-bonded carbon-containing pellets after reduction and Zn removal enter a shaft furnace, 200 plus materials and 300kg/t of carbon-containing waste materials are sprayed from a hot air port of the shaft furnace, and 1250 plus materials and 1400 ℃ hot air are introduced into the shaft furnace, wherein the hot air temperature is 1800m3T, introducing cold air of 800m3And/t, adding 0.7 ton of metallurgical coke. 1 ton of qualified molten iron is produced, and 0.5t/t of slag is removed.
Claims (5)
1. The method for smelting molten iron by using the iron-containing waste cold-bonded pellets is characterized in that the iron-containing waste cold-bonded carbon-containing pellets are subjected to pre-reduction to remove impurities such as zinc, lead, potassium and sodium in a hearth type reverberatory furnace by using coal gas generated by a shaft furnace, wherein the reaction temperature in the hearth type reverberatory furnace is 950-1350 ℃; the reduced cold-bonded carbon-containing pellets enter a shaft furnace, and the cold-bonded carbon-containing pellets are melted in the shaft furnace; the coal gas generated in the shaft furnace is respectively supplied to the iron-containing waste cold-bonded carbon-containing pellets and the shaft furnace for use.
2. The method for smelting molten iron using iron-containing waste cold-bonded pellets as claimedin claim 1, wherein the reaction temperature in the hearth reverberatory furnace is 1050-1300 ℃.
3. The method for smelting molten iron using iron-containing waste cold-bonded pellets according to claim 1, wherein hot blast and cold blast for assisting secondary combustion are separately introduced into the shaft furnace; the hot air is heated by coal gas generated by the shaft furnace, and the temperature of the hot air is 1250-.
4. The method of claim 1, wherein the fuel used in the shaft furnace is coke, lump anthracite, cold-bonded coal briquettes, and a portion of non-coke coal dust, waste plastic pellets, waste tire pellets, waste wood pellets which are blown into the shaft furnace.
5. The method for smelting molten iron using iron-containing waste cold-bonded pellets according to claim 1, wherein the shaft furnace has a double exhaust port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02110713 CN1197981C (en) | 2002-01-31 | 2002-01-31 | Method for smelting melted iron with iron-bearing waste cooled agglomerated pellet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02110713 CN1197981C (en) | 2002-01-31 | 2002-01-31 | Method for smelting melted iron with iron-bearing waste cooled agglomerated pellet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1435494A CN1435494A (en) | 2003-08-13 |
| CN1197981C true CN1197981C (en) | 2005-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02110713 Expired - Fee Related CN1197981C (en) | 2002-01-31 | 2002-01-31 | Method for smelting melted iron with iron-bearing waste cooled agglomerated pellet |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649366B (en) * | 2009-03-04 | 2011-10-05 | 贾会平 | Method and device for making iron by smelting reduction |
| CN104694758A (en) * | 2015-03-13 | 2015-06-10 | 宝钢发展有限公司 | Technique for comprehensively utilizing iron-containing dust mud |
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| CN1435494A (en) | 2003-08-13 |
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Granted publication date: 20050420 Termination date: 20140131 |