CN108796209B - Method for treating and utilizing sludge of grinding roller - Google Patents
Method for treating and utilizing sludge of grinding roller Download PDFInfo
- Publication number
- CN108796209B CN108796209B CN201710283370.4A CN201710283370A CN108796209B CN 108796209 B CN108796209 B CN 108796209B CN 201710283370 A CN201710283370 A CN 201710283370A CN 108796209 B CN108796209 B CN 108796209B
- Authority
- CN
- China
- Prior art keywords
- sludge
- grinding roller
- electric furnace
- deoiling
- smelting
- 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.)
- Active
Links
Classifications
-
- 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
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Sludge (AREA)
Abstract
A grinding roller sludge treatment and utilization method, put grinding roller sludge into rotary kiln gasification furnace and carry on the deoiling treatment of low-temperature gasification, water and oil substance in the sludge are heated and evaporated, cracked to become combustible gas, the sludge is outside the flue gas, oil pyrolysis exothermal action finish deoiling and mummification; the sludge after deoiling and drying is filled into a ton bag, and is directly hung on the scrap steel and solid materials in the electric furnace material basket in the charging stage of the electric furnace according to the proportion of the sludge accounting for 0.5-2% of the mass of the molten iron for smelting the electric furnace, and then smelting is carried out according to the smelting procedure of the electric furnace. The method for treating and utilizing the sludge of the grinding roller has the advantages of simple process, convenient operation, low cost and full utilization of valuable resources.
Description
Technical Field
The invention relates to a waste treatment method, in particular to a method for treating and utilizing grinding roller sludge.
Background
The grinding roller sludge mainly comes from the sludge generated by grinding the roller in the working procedures of hot rolling, cold rolling and the like in iron and steel enterprises when the roller is repaired and polished, and is filtered by a paper bag filter. The main components of the sludge are components polished from a roller and a grinding wheel during polishing of the roller and the grinding wheel, and an emulsion is used for lubricating and cooling during polishing, so that the contents of metallic iron, chromium and nickel in the sludge of the roller are high, the three valuable metals exist in a metallic state, and contain a certain amount of oil, the water content is 15-40%, the oil content is 2-15%, the total iron content of a dry basis is about 60%, the chromium content is 0.5-5%, and the nickel content is 0.5-4%.
The main treatment and disposal method of the grinding roller sludge comprises the following steps:
1) landfill, the final disposal has but the disadvantage of occupying land and wasting valuable metal resources;
2) incineration, namely the oil (organic matter) removal effect is good, but the disadvantages of high energy consumption and treatment of discharged flue gas exist;
3) low-temperature distillation can recover oil and valuable metal resources, but the oil purification is more complex and the cost is higher, so that the method is suitable for treating the sludge with high oil content;
4) and (3) cement kiln coprocessing: the synergistic utilization of the cement kiln is a better method, but the cross-factory transportation has the defects of drying pretreatment, and meanwhile, the treatment of the cement kiln smoke is burdened, and the waste of valuable metals such as chromium and nickel is caused;
5) the internal of the iron and steel enterprise is returned to production and utilization, the iron and steel enterprise is directly pressed into blocks and then returned to an electric furnace or a converter, but the blocks need to be dried and pretreated, and the problem of VOC emission caused by improper operation of adding the converter or the electric furnace is solved; and (4) sintering is returned, oil can volatilize in the sintering process and enter flue gas of the main flue, and negative influence is caused on the safety of the electric dust collector.
Disclosure of Invention
The invention aims to provide a method for treating and utilizing sludge of a grinding roller, which has the advantages of simple process, convenient operation, low cost and full utilization of valuable resources.
In order to achieve the above purpose, the technical scheme of the invention is that,
a grinding roller sludge treatment and utilization method, put grinding roller sludge into rotary kiln gasification furnace and carry on the deoiling treatment of low-temperature gasification, water and oil substance in the sludge are heated and evaporated, cracked to become combustible gas, the sludge is outside the flue gas, oil pyrolysis exothermal action finish deoiling and mummification; and adding the deoiled and dried sludge into an electric furnace according to the proportion that the sludge accounts for 0.5-2% of the mass of the molten iron smelted by the electric furnace, and smelting according to an electric furnace smelting procedure.
Preferably, the temperature of the grinding roller sludge in the gasification furnace is controlled to be 300-500 ℃, the air excess coefficient is 0.2-0.8 when the oil is removed from the gasification furnace, and the reaction time of the grinding roller sludge in the gasification furnace is controlled to be 10-30 min.
Preferably, the oil content of the grinding roller sludge is less than 15% when the grinding roller sludge enters the rotary kiln gasification furnace, and the water content of the grinding roller sludge is less than 20%.
Preferably, the deoiled and dried sludge is put into a ton bag of 0.5 ton or 1 ton for standby.
The method comprises the steps of putting the grinding roller sludge into a rotary kiln gasification furnace for low-temperature gasification and deoiling treatment, heating and evaporating water and oil substances in the sludge, cracking the water and oil substances into combustible gas, cracking the sludge outside to release heat and the like to complete deoiling and drying, and then adding the sludge into an electric furnace for smelting.
The sludge is added into the electric furnace according to the proportion that the sludge accounts for 0.5 to 2 percent of the mass of the molten iron smelted by the electric furnace, on one hand, the resources of iron, chromium, nickel and the like are recovered, the electrified smelting fusion of the sludge and the scrap steel is convenient, and on the other hand, the regulation and control of the molten steel alloy components cannot be hindered.
The temperature of the grinding roller sludge in the gasification furnace is controlled to be 300-500 ℃; the volatilization and the cracking of the oil and the gasification reaction in the gasification furnace can be ensured at a certain temperature, the oil can be thoroughly removed after the temperature reaches a certain value, and the energy consumption of the system operation can be increased when the temperature is higher.
When the oil is removed from the gasifier, the air excess coefficient is 0.2-0.8, a certain amount of air is introduced to ensure anoxic cracking and gasification reaction in the reaction, and a certain amount of CO and CH4 in combustible gas can also ensure that excessive tar cannot be generated; too high an air excess factor may cause excessive oxidation of metallic iron and also may cause a significant increase in the production of thermal pollutants such as NO.
The reaction time of the sludge in the gasification furnace is controlled to be 10-30 min, the evaporation of water in the gasification furnace, the volatilization of oil and gas cracking, and the gasification reaction of organic matters need a certain time to ensure the deoiling effect, the deoiling can be thorough in the reaction for a certain time, and the time is not meaningful for the deoiling.
The oil content of the sludge of the grinding roller is less than 15 percent, on one hand, the burden of flue gas treatment can be increased due to overhigh oil content, and the oil can be recovered by adopting a more proper method due to overhigh oil content. The water content of the grinding roller sludge is less than 20%, the grinding roller sludge below the water content cannot impact a gasification and deoiling system, and dewatering pretreatment is carried out before the grinding roller sludge with the overhigh water content enters the rotary kiln gasification furnace.
Compared with the prior art, the invention has the following beneficial effects:
1. realizes the recycling of valuable metals such as iron, chromium and nickel in the sludge of the grinding roller, and does not impact electric furnace smelting and smoke emission.
2. The gasified deoiled oil is returned to the electric furnace for utilization, the operation is simple, and the processing cost is low.
3. The gasification deoiling can not cause pollutant discharge exceeding standard, and the combustible gas generated by gasification can be used as an external heating heat source for sewage gasification or pre-dehydration when the water content of the sludge is too high, so that the process energy consumption is low.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The mill roll sludge produced in a hot rolling mill roll plant has an oil content of 7.5%, a water content of 24.6%, a total iron content of 58.5% (dry basis), a chromium content of 2.0% (dry basis), and a nickel content of 2.5% (dry basis). The sludge is then fed into the kiln head of the rotary kiln gasification furnace through a screw feeder, and the technological parameters in the rotary kiln gasification furnace are controlled as follows: the temperature is 400 ℃, the air excess coefficient is 0.5, and the reaction time is 20 min; the discharged grinding roller sludge residue comprises the following main chemical components in terms of oxides: 62.9 percent of Te, 1.1 percent of Si, 2.3 percent of Cr2, 2.6 percent of NiC and 1.1 percent of TC, and the oil content and the water content are zero.
The grinding roller sludge residues are placed in ton bags, and the loading amount of each bag is 1 ton +/-0.1 ton; the method is used when stainless steel grades (with the mark of SUS304 and the Ni content of finished products of 8 percent) are smelted in an electric furnace with the nominal capacity of 100 tons, and the using method comprises the following steps:
1) the ton bags containing the materials are stacked on the site (dried) and can be used at any time; firstly, scrap steel is processed;
2) and other solid materials are added into the material basket;
3) after all the steel scrap and the solid materials are mixed, hanging a ton bag (1-2 bags) storing the materials on the steel scrap and the solid materials in the material basket;
4) and then smelting SUS304 stainless steel by an electric furnace according to the conventional operation, namely, charging a material basket, electrifying to melt (scrap steel and solid materials), adding molten iron (dephosphorized molten iron), continuously melting, heating, reducing (temperature measurement and sampling), tapping and the like.
Example 2
The mill roll sludge produced in a thick plate mill roll plant has an oil content of 5.5%, a water content of 21.6%, a total iron content of 56.5% (dry basis), a chromium content of 1.1% (dry basis), and a nickel content of 3.3% (dry basis). The sludge is then fed into the kiln head of the rotary kiln gasification furnace through a screw feeder, and the technological parameters in the rotary kiln gasification furnace are controlled as follows: the temperature is 350 ℃, the air excess coefficient is 0.35, and the reaction time is 15 min; the discharged grinding roller sludge residue comprises the following main chemical components in terms of oxides: te 59.7%, Si 2.7%, Cr1.2%, Ni 3.5%, TC 3.4%, and oil content and water content are zero.
The grinding roller sludge residues are placed in ton bags, and the loading amount of each bag is 0.5 ton +/-0.05 ton; the method is used when stainless steel grades (with the brand number of BN4 and the Ni content of finished products of 4.0 percent) are smelted in an electric furnace with the nominal capacity of 100 tons, and the using method comprises the following steps:
1) the ton bags containing the materials are stacked on the site (dried) and can be used at any time;
2) firstly, scrap steel and other solid materials are mixed into a material basket;
3) after all the steel scrap and the solid materials are mixed, a ton bag (2-4 bags) storing the materials is hung on the steel scrap and the solid materials in the material basket,
4) and then smelting the BN4 stainless steel according to an electric furnace, namely, the conventional operation of charging a material basket, electrifying and melting (scrap steel and solid materials), adding molten iron (dephosphorized molten iron), continuously melting, heating, reducing (measuring temperature and sampling), tapping and the like is carried out.
Example 3
The mill roll sludge produced in a cold rolling mill roll workshop has an oil content of 11.3%, a water content of 22.7%, a total iron content of 61.6% (dry basis), a chromium content of 3.8% (dry basis) and a nickel content of 0.15% (dry basis). The sludge is then fed into the kiln head of the rotary kiln gasification furnace through a screw feeder, and the technological parameters in the rotary kiln gasification furnace are controlled as follows: the temperature is 450 ℃, the air excess coefficient is 0.6, and the reaction time is 25 min; the discharged grinding roller sludge residue comprises the following main chemical components in terms of oxides: 65.0% of TFe, 0.3% of Si, 4.1% of Cr, 0.2% of Ni and 1.3% of TC, and the oil content and the water content are zero.
The grinding roller sludge residue is placed in ton bags, and the loading amount of each bag is 1.0 ton +/-0.1 ton; the method is used when stainless steel grades (with the brand number of BN1 and the Ni content of finished products of 1.0 percent) are smelted in an electric furnace with the nominal capacity of 100 tons, and the using method comprises the following steps:
1) the ton bags containing the materials are stacked on the site (dried) and can be used at any time;
2) firstly, scrap steel and other solid materials are mixed into a material basket;
3) after all the steel scrap and the solid materials are mixed, hanging a ton bag (1-3 bags) storing the materials on the steel scrap and the solid materials in the material basket;
4) and then smelting the BN1 stainless steel according to an electric furnace, namely, the conventional operation of charging a material basket, electrifying and melting (scrap steel and solid materials), adding molten iron (dephosphorized molten iron), continuously melting, heating, reducing (measuring temperature and sampling), tapping and the like is carried out.
Claims (3)
1. A method for treating and utilizing sludge of a grinding roller is characterized in that the sludge of the grinding roller is put into a rotary kiln gasification furnace for low-temperature gasification and deoiling treatment, moisture and oil substances in the sludge are heated, evaporated and cracked into combustible gas, and the sludge is subjected to external smoke and oil cracking and heat release to complete deoiling and drying; the sludge after deoiling and drying is filled into a ton bag, and is directly hung on the scrap steel and solid materials in the electric furnace material basket in the charging stage of the electric furnace according to the proportion of the sludge accounting for 0.5-2% of the mass of the molten iron for smelting the electric furnace, and then smelting is carried out according to the smelting procedure of the electric furnace; wherein the temperature of the grinding roller sludge in the gasification furnace is controlled to be 300-500 ℃, the air excess coefficient in the gasification furnace is 0.2-0.8, and the reaction time of the grinding roller sludge in the gasification furnace is controlled to be 10-30 min.
2. The method for treating and utilizing the sludge of the grinding roller as claimed in claim 1, wherein the oil content of the sludge of the grinding roller is less than 15% and the water content is less than 20% when the sludge of the grinding roller enters the rotary kiln gasification furnace.
3. The method for treating and utilizing the sludge of the grinding rolls as claimed in claim 1, wherein the deoiled and dried sludge is put into a ton bag of 0.5 ton or 1 ton for standby.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710283370.4A CN108796209B (en) | 2017-04-26 | 2017-04-26 | Method for treating and utilizing sludge of grinding roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710283370.4A CN108796209B (en) | 2017-04-26 | 2017-04-26 | Method for treating and utilizing sludge of grinding roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108796209A CN108796209A (en) | 2018-11-13 |
| CN108796209B true CN108796209B (en) | 2020-09-25 |
Family
ID=64069740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710283370.4A Active CN108796209B (en) | 2017-04-26 | 2017-04-26 | Method for treating and utilizing sludge of grinding roller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108796209B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111944548A (en) * | 2020-08-13 | 2020-11-17 | 中南大学 | Method for synergistically utilizing organic solid wastes by steel sintering process |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337059C (en) * | 2003-06-27 | 2007-09-12 | 清华大学 | Multistage burning method and system for gasification of refuse and co-fusion of charcoal ash in rotary kiln |
| CN101811792B (en) * | 2009-02-24 | 2012-02-15 | 宝山钢铁股份有限公司 | Processing method of stainless steel cold rolling pickling wastewater |
| CN102190413B (en) * | 2011-03-24 | 2012-07-04 | 华新环境工程有限公司 | Method of integratedly utilizing sludge pretreatment and cement kiln, and system thereof |
| CN103663896A (en) * | 2013-11-12 | 2014-03-26 | 同济大学 | Method and device for stabilizing heavy metal through pyrolysis of sludge |
| CN105271628B (en) * | 2015-10-22 | 2018-06-12 | 得利满水处理系统(北京)有限公司 | A kind of sludge at low temperature anhydration system and method |
| CN105524631B (en) * | 2016-01-19 | 2018-10-23 | 青岛理工大学 | Method for preparing energy gas by using sludge and simultaneously harmlessly treating chromium slag |
| CN106277705A (en) * | 2016-09-29 | 2017-01-04 | 中冶华天南京工程技术有限公司 | Process and the system of smelting furnace is returned in the direct mummification of pickling mud |
| CN106222364B (en) * | 2016-09-29 | 2018-05-18 | 中冶华天南京工程技术有限公司 | Pickling sludge drying pelletizing returns the process and system of AOD furnace |
-
2017
- 2017-04-26 CN CN201710283370.4A patent/CN108796209B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108796209A (en) | 2018-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112113223B (en) | Method for cooperatively disposing industrial dangerous waste by utilizing steel mill kiln | |
| CN110465538B (en) | Pre-dechlorination-sintering treatment process for high-chlorine metallurgical waste and incineration fly ash | |
| AU721376B2 (en) | Method and apparatus for recycling iron and steel industry waste | |
| JPH09505854A (en) | Method for treating solid residues from a refuse incineration plant and apparatus for implementing this method | |
| CN108796209B (en) | Method for treating and utilizing sludge of grinding roller | |
| CN111411238A (en) | Method and system for cooperatively treating stainless steel dust and sludge through high-carbon ferrochrome smelting | |
| CN206279231U (en) | The system for processing iron content greasy filth | |
| JPS6153414B2 (en) | ||
| CN108793650B (en) | Treatment method of steel rolling oily sludge | |
| DK2874763T3 (en) | PROCEDURE AND PLANT TO RECOVER PHOSPHOR CONTAINING WASTE MATERIALS AND / OR ENERGY | |
| Pichler et al. | Recycling of zinc-and lead-bearing residues with pyrolysis gas | |
| EP0486759B1 (en) | Process and device for subsequent treatment and purification of waste gas originating from a secondary aluminium foundry | |
| CN206279226U (en) | The system for processing iron content greasy filth | |
| JP2009256741A (en) | Method of recovering valuable metal from waste battery | |
| CN102051475A (en) | Method for recycling acid-washed iron-containing sludge | |
| JPH06296956A (en) | Method and device for recovering glass and metal from solid residue left in refuse incinerator | |
| JP3746993B2 (en) | Steelworks generated waste treatment system | |
| JP2007254863A (en) | Sintered material with the use of organic waste, method for producing the sintered material, and refining method | |
| JP2004105835A (en) | Method for utilizing activated sludge | |
| JP2021046608A (en) | Method for manufacturing molten iron by electric furnace | |
| JP3641279B2 (en) | Method and apparatus for dewatering metal scrap, etc. | |
| CN213686835U (en) | System for utilize steel mill stove to deal with industry hazardous waste in coordination | |
| JP5167586B2 (en) | How to use zinc-containing iron scrap in iron making process | |
| RU2208202C2 (en) | Method for processing of solid domestic and fine-disperse industrial garbage | |
| CN114480832B (en) | Pretreatment and roasting treatment method for extracting vanadium from vanadium-containing Dan Youzha |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |