CN107164603A - A kind of method of stainless-steel cold-rolling sludge recycling - Google Patents
A kind of method of stainless-steel cold-rolling sludge recycling Download PDFInfo
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- CN107164603A CN107164603A CN201710467605.5A CN201710467605A CN107164603A CN 107164603 A CN107164603 A CN 107164603A CN 201710467605 A CN201710467605 A CN 201710467605A CN 107164603 A CN107164603 A CN 107164603A
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- steel cold
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- rolling sludge
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- 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
- C21C5/5264—Manufacture of alloyed steels including ferro-alloys
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- 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
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a kind of method of stainless-steel cold-rolling sludge recycling.This method includes：Processing is dried to stainless-steel cold-rolling sludge, the water content for making stainless-steel cold-rolling sludge is 20wt% 30wt%；By feeding, dried stainless-steel cold-rolling sludge is fitted into electric arc furnaces by basket, it is desirable to the stainless-steel cold-rolling sludge no more than 3 tons is added in every 115 tons of steelmaking feeds；Ensure that stainless-steel cold-rolling sludge is placed in charging basket bottom；Steelmaking feed is added into electric arc furnaces, into production model, the recycling to stainless-steel cold-rolling sludge is completed, wherein, turn on angle when starting oxygen blast is 23000Kwh 25000Kwh.The method of the stainless-steel cold-rolling sludge recycling of the present invention has good environment protecting, will not produce secondary pollution, use cost is low, also will not bring unfavorable conditions and adverse consequences to electric arc furnace smelting.
Description
Technical field
The present invention relates to a kind of recovery and treatment method of stainless-steel cold-rolling pickling sludge, belong to industrial bazardous waste and reclaim
Utilize field.
Background technology
In process of production, its surface is by the dense oxidation film covering of the formation such as Fe, Cr, Mn, to strengthen not to stainless steel
The surface smoothness and erosion-resisting characteristics of rust steel, it is necessary to carry out pickling to remove the oxide-film of surface steel surface to stainless steel.Often
Acidwash solution mainly has HF and HNO3Mixed liquor, Na2SO4、H2SO4Deng stainless steel is main through the waste water produced by pickling
In acidity, pH value is typically below 4, it is necessary to discharged after neutralization.Simultaneously in waste water containing substantial amounts of iron ion, it is ferrous from
Son, fluoride and certain density heavy metal Cr, Ni, during industrial treatment is typically carried out using lime to the ion in waste water
With, precipitation to remove in waste liquid contained polluter.The sludge outward appearance precipitated is block in peony, is to have particle diameter very
Tiny particle coagulation is formed, and is substantially free of thick sandstone or other hard particles, normal moisture content about 50%.
The method for sludge treatment of domestic and international early stage is very extensive, exactly directly stacks it or fills out sea.The direct heap of sludge
Putting not only needs to take a large amount of soils, can be two caused by serious leakage and to environment if addressing is improper or antiseepage is not up to standard
Secondary pollution；Directly fill out Hai Zehui to cause harm to marine organisms, and then threaten human health.So increasing country forbids
Continue to handle sludge using this kind of method.
Mainly there are sanitary landfill method and burning method in countries in the world to the conventional treatment mode of stainless steel sludge now.Health is filled out
It is a kind of processing mode stronger to sludge species adaptability to bury, and is characterized in simple to operate, but there is also it is more prominent the problem of：
Sanitary landfills is to require higher to the soil mechanical properties of sludge first, and the sepage of landfill yard belongs to high-concentration sewage, it is necessary to concentrated
Harmful element in processing, sludge is possible to gradually to ooze out, and Groundwater formation is polluted, therefore sanitary landfills is a kind of temporary transient
The mode of stabilization processes sludge.Sludge incineration is the effective way of sludge reduction, all in removal sludge by burning
Combustibles, can be greatly reduced sludge weight and volume, it is often more important that heavy metal contained therein is oxidized at high temperature
Steady oxide, so as to reach the curing/stabilizing purpose of sludge.But sludge incineration also has distinct disadvantage：High cost and burning
Waste gas, noise pollution of generation etc..
Before 2016, certain steel mill also handles stainless-steel cold-rolling sludge using sanitary landfills mode, but landfill place is accounted for
With larger, and the secondary pollution produced is also more serious, as national requirements for environmental protection is more and more stricter, sludge sanitary landfills expense
Also occur rapid rise, gone up by 360RMB/ tons of handlings to 2600RMB/ tons, amount of increase is up to more than 600%.
Between 2013 to 2015, steel mill is also constantly trying to handle cold rolling sludge using various new methods, but with
End up in failure.Such as directly load cold rolling sludge mode using electric arc furnaces and recycled, but be due to sludge water content content compared with
Height, just an explosion occurred in second of test electric arc furnaces；Hereafter, after steel mill dries cold rolling sludge, load electric arc furnaces and use,
But it is due to that drying is uneven, a large amount of dust can be produced in factory building sometimes, can still occur small blast in stove sometimes.
The content of the invention
In order to solve the above-mentioned technical barrier of prior art, dirt can be thoroughly solved it is an object of the invention to provide one kind
The secondary pollution that mud processing is brought occurs, and reduces the side of the innoxious recycling of the stainless-steel cold-rolling sludge of landfill expense
Method.
, should the invention provides a kind of method of stainless-steel cold-rolling sludge recycling in order to realize above-mentioned technical purpose
The method of stainless-steel cold-rolling sludge recycling comprises the following steps：
Processing is dried to stainless-steel cold-rolling sludge, the water content for making stainless-steel cold-rolling sludge is 20wt%-30wt%；
By feeding, dried stainless-steel cold-rolling sludge is fitted into electric arc furnaces by basket, it is desirable in every 115 tons of steelmaking feeds
Add the stainless-steel cold-rolling sludge no more than 3 tons；Ensure that stainless-steel cold-rolling sludge is placed in charging basket bottom；
Steelmaking feed is added into electric arc furnaces, into production model, the recycling to stainless-steel cold-rolling sludge is completed, its
In, turn on angle when starting oxygen blast in production process is 23000Kwh-25000Kwh.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, it is preferable that when production carries out oxygen blast operation, really
Possess after molten soup is formed and carry out oxygen blast operation again.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, it is preferable that when starting oxygen blast in production process
Turn on angle be 25000Kwh, i.e., 4min more late than normal oxygen blow duration.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, it is preferable that stainless-steel cold-rolling sludge is carried out
The mode of drying process includes drying or being dried by drying equipment；It is highly preferred that being dried by drying equipment.Adopt
It is just KJG120 hollow blade driers by equipment, is fought by Jiangsu and think the manufacturing of waffle construction equipment Engineering Co., Ltd.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, it is preferable that the stainless-steel cold-rolling sludge is reclaimed
The method of processing specifically includes following steps：
Processing is dried to stainless-steel cold-rolling sludge, the water content for making stainless-steel cold-rolling sludge is 20wt%-30wt%；
Capture dried stainless-steel cold-rolling sludge, it is ensured that stainless-steel cold-rolling sludge is placed in charging basket bottom；
By feeding, dried stainless-steel cold-rolling sludge is fitted into electric arc furnaces by basket, it is desirable in every 115 tons of steelmaking feeds
Add stainless-steel cold-rolling sludge and be no more than 3 tons；
Steelmaking feed is added into electric arc furnaces, into production model, the recycling to stainless-steel cold-rolling sludge is completed, its
In, turn on angle when starting oxygen blast in production process is 23000Kwh-25000Kwh.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, it is preferable that stainless-steel cold-rolling sludge is by electricity
After the production of arc stove is smelted, slag is formed, slag can be recycled.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, it is preferable that the composition of stainless-steel cold-rolling sludge
It is as shown in the table：
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, it is preferable that dried stainless-steel cold-rolling is dirty
The composition of mud is as shown in the table：
Present invention also offers a kind of method for making steel, the method for making steel include using dried stainless-steel cold-rolling sludge as
Raw material is added to the step in electric arc furnaces.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, stainless-steel cold-rolling sludge is by electric arc furnaces
After production is smelted, slag is ultimately formed, slag is transported to accessory substance factory, by a series of slag processing processes, a part of shape
Electric arc furnaces is transmitted back into useful metal thing to use, a part forms sintering nodulizing raw material and enters mine heat furnace smelting.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, place is dried to stainless-steel cold-rolling sludge
Reason, makes stainless-steel cold-rolling sludge not exploded when putting into electric arc furnaces.The method of the present invention ensures dried stainless-steel cold-rolling
The water content 20wt%-30wt% of sludge, water content is low, and dust is easily produced in transport, charging and energization production；Water content
Height, the production that is powered easily is exploded.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, used drying equipment ensure that stainless steel
The drying effect and uniformity and the accuracy of water content of cold rolling sludge.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, it is desirable to added in every 115 tons of steelmaking feeds
Stainless-steel cold-rolling sludge no more than 3 tons, it is ensured that the balance of sludge consumption and yield, makes it not overstock while also ensuring that
The safety in production of electric arc furnaces.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, overhead traveling crane crawl stainless-steel cold-rolling sludge, which loads, to be added
When expecting basket, sludge is mounted in the bottom of charging basket, that is, the basket bottom that feeds loads after a certain amount of steel scrap, and stainless-steel cold-rolling sludge is filled
Enter in the basket that feeds, then add remaining steel scrap, prevent from forming nonconductor or the material that collapses causes electrode scrap.
In the method for the stainless-steel cold-rolling sludge recycling of the present invention, during into production model, control starts oxygen blast
When turn on angle be 23000Kwh-25000Kwh, to reduce the generation of dust, at the same save oxygen the amount of being blown into.
The method of the stainless-steel cold-rolling sludge recycling of the present invention, Treatment of Sludge is not take up filling place, and will not
Generation harmful element oozes out, and makes the problem of underground water is contaminated, and will not produce new waste gas, noise pollution, will not occur big
Measure dust to overflow, cause dust pollution；
The processing cost of the method for the stainless-steel cold-rolling sludge recycling of the present invention is low, accounts for sanitary landfills expense about
11%；
The method of the stainless-steel cold-rolling sludge recycling of the present invention, is dried by equipment, will not occurred in electric arc furnaces quick-fried
Fried phenomenon；
By the improvement to load mode, losing for powered electrode is not resulted in.
The method of the stainless-steel cold-rolling sludge recycling of the present invention is put into a kind of low cost, environmentally friendly and innoxious place
Reason mode, recycles stainless-steel cold-rolling sludge, greatly reduces steel mill and fills the expense that cold rolling sludge is produced, and to environment
Harmless and non-secondary pollution.
Brief description of the drawings
The process chart for the method that Fig. 1 recycles for the stainless-steel cold-rolling sludge in embodiment 1.
Embodiment
In order to which technical characteristic, purpose and beneficial effect to the present invention are more clearly understood from, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment 1
A kind of method of stainless-steel cold-rolling sludge recycling is present embodiments provided, its technological process is as shown in figure 1, tool
Body comprises the following steps：
The sludge (composition is as shown in table 1) that cold rolling mill is produced uses transported on trucks to accessory substance processing plant sludge warehouse,
Stack about 1500 tons of ability in warehouse (drying equipment, and comprehensive dust pelletizing system are had in accessory substance factory)；
Table 1
| Distinguish | Moisture | Ni | Cr | Fe | S | F | Proportion |
| Sludge | 55% | 1.1% | 2% | 18% | 10% | 2.5% | 1.5g/cm3 |
Wet mud is handled by drying equipment, and the composition of dried cold rolling sludge as shown in table 2, reaches the moisture of requirement
Target, water content 20wt%-30wt%, and installed using jumbo bag, it is to be transported to reduce dry sludge using jumbo bag charging
With the generation of dust during use；
Table 2
| Distinguish | Moisture | Ni | Cr | Fe | S | F | Proportion |
| Dry sludge | 25.5% | 1.2% | 3% | 20% | 11% | 4.5% | 2.2g/cm3 |
It is standby that dried sludge finished product is transported to electric-arc furance loading workshop using flat car；
By feeding, dried stainless-steel cold-rolling sludge is fitted into electric arc furnaces by basket, during electric arc furnaces dispensing, per 115 tons of stove
Raw material adds no more than 3 tons (3 jumbo bags, per jumbo bag weight of sludge<1 ton)；When overhead traveling crane crawl sludge loads charging basket, sludge will be filled
In charging basket bottom, that is, the basket bottom that feeds loads after 5 tons of steel scraps, and sludge is fitted into charging basket, remaining steel scrap is then added；
Sludge loads after charging basket, to use overhead traveling crane grab bucket to scratch jumbo bag, and sludge is spread out in charging basket,
Nonconductor is avoided the formation of, causes powered electrode to be lost；
After sludge loading is finished, other raw materials are normally loaded according to list of ingredients；
Electric arc furnace smelting powered-on mode is normally produced according to original pattern, and turn on angle when starting oxygen blast is 25000Kwh,
Start oxygen blow duration and postpone about 4min or so；
Sludge ultimately forms slag, clinker is transported to accessory substance factory, by one after the production of electric arc furnaces smelting
Serial slag processing process, a part, which is formed with, to be transmitted back to electric arc furnaces with metal object and uses, and a part forms sintering nodulizing former material
Material enters mine heat furnace smelting.
At whole year in 2016, the cold rolling sludge totality electric arc furnaces processing that the steel mill occurs, landfill of not going out completely
Reason, thrifty about 9.4 hundred million yuan of landfill expense (2600 yuan/ton × 36000 tons/year=93600000 yuan/year).
The method of the stainless-steel cold-rolling sludge recycling of the present invention has that input cost is low, environment protecting is good and does not produce
Secondary pollution, cold rolling Treatment of Sludge are thorough, the characteristics of not producing negative interaction to processing equipment.
Claims (10)
1. a kind of method of stainless-steel cold-rolling sludge recycling, it is characterised in that stainless-steel cold-rolling sludge recycling
Method comprises the following steps：
Processing is dried to stainless-steel cold-rolling sludge, the water content for making stainless-steel cold-rolling sludge is 20wt%-30wt%；
By feeding, dried stainless-steel cold-rolling sludge is fitted into electric arc furnaces by basket, adds and does not surpass in every 115 tons of steelmaking feeds
Cross 3 tons of stainless-steel cold-rolling sludge；Also, the stainless-steel cold-rolling sludge is placed in the bottom of charging basket；
Steelmaking feed is added into electric arc furnaces, into production model, the recycling to stainless-steel cold-rolling sludge is completed, wherein,
Turn on angle when starting oxygen blast in production process is 23000Kwh-25000Kwh.
2. the method for stainless-steel cold-rolling sludge recycling according to claim 1, it is characterised in that production carries out oxygen blast
During operation, it is ensured that there is molten soup to carry out oxygen blast operation again after being formed.
3. the method for stainless-steel cold-rolling sludge recycling according to claim 1, it is characterised in that opened in production process
Turn on angle during beginning oxygen blast is 25000Kwh.
4. the method for stainless-steel cold-rolling sludge recycling according to claim 1, it is characterised in that to stainless-steel cold-rolling
The withering mode of sludge includes drying or being dried by drying equipment.
5. the method for stainless-steel cold-rolling sludge recycling according to claim 4, it is characterised in that pass through drying equipment
It is dried.
6. the method for stainless-steel cold-rolling sludge recycling according to claim 1, it is characterised in that the stainless-steel cold-rolling
The method of sludge recycling specifically includes following steps：
Processing is dried to stainless-steel cold-rolling sludge, the water content for making stainless-steel cold-rolling sludge is 20wt%-30wt%；
Capture dried stainless-steel cold-rolling sludge, it is ensured that stainless-steel cold-rolling sludge is placed in charging basket bottom；
By feeding, dried stainless-steel cold-rolling sludge is fitted into electric arc furnaces by basket, is added in every 115 tons of steelmaking feeds stainless
The cold rolling sludge of steel is no more than 3 tons；
Steelmaking feed is added into electric arc furnaces, into production model, the recycling to stainless-steel cold-rolling sludge is completed, wherein,
Turn on angle when starting oxygen blast in production process is 23000Kwh-25000Kwh.
7. the method for stainless-steel cold-rolling sludge recycling according to claim 1, it is characterised in that stainless-steel cold-rolling is dirty
Mud forms slag after the production of electric arc furnaces is smelted, and slag is recycled.
8. the method for stainless-steel cold-rolling sludge recycling according to claim 1, it is characterised in that the stainless steel is cold
The composition for rolling sludge is as shown in the table：
9. the method for stainless-steel cold-rolling sludge recycling according to claim 1, it is characterised in that dried stainless
The composition of the cold rolling sludge of steel is as shown in the table：
10. a kind of method for making steel, it is characterised in that the method for making steel includes regarding dried stainless-steel cold-rolling sludge as raw material
It is added to the step in electric arc furnaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710467605.5A CN107164603A (en) | 2017-06-20 | 2017-06-20 | A kind of method of stainless-steel cold-rolling sludge recycling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710467605.5A CN107164603A (en) | 2017-06-20 | 2017-06-20 | A kind of method of stainless-steel cold-rolling sludge recycling |
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| CN107164603A true CN107164603A (en) | 2017-09-15 |
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| CN201710467605.5A Pending CN107164603A (en) | 2017-06-20 | 2017-06-20 | A kind of method of stainless-steel cold-rolling sludge recycling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111434783A (en) * | 2019-01-15 | 2020-07-21 | 宝山钢铁股份有限公司 | Slag former for electric furnace steelmaking and manufacturing method thereof |
| CN114853371A (en) * | 2022-05-09 | 2022-08-05 | 宝武杰富意特殊钢有限公司 | Environment-friendly treatment method for sludge of metallurgical rolling molten steel treatment system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5116201A (en) * | 1974-08-01 | 1976-02-09 | Nisshin Steel Co Ltd | Sansensuratsujino shorihoho |
| CN105859092A (en) * | 2016-04-27 | 2016-08-17 | 桐乡市致远环保科技有限公司 | Acid washing sludge recycling method |
| CN105969986A (en) * | 2016-06-12 | 2016-09-28 | 张家港浦项不锈钢有限公司 | Treatment method of stainless steel pickling sludge |
-
2017
- 2017-06-20 CN CN201710467605.5A patent/CN107164603A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5116201A (en) * | 1974-08-01 | 1976-02-09 | Nisshin Steel Co Ltd | Sansensuratsujino shorihoho |
| CN105859092A (en) * | 2016-04-27 | 2016-08-17 | 桐乡市致远环保科技有限公司 | Acid washing sludge recycling method |
| CN105969986A (en) * | 2016-06-12 | 2016-09-28 | 张家港浦项不锈钢有限公司 | Treatment method of stainless steel pickling sludge |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111434783A (en) * | 2019-01-15 | 2020-07-21 | 宝山钢铁股份有限公司 | Slag former for electric furnace steelmaking and manufacturing method thereof |
| CN114853371A (en) * | 2022-05-09 | 2022-08-05 | 宝武杰富意特殊钢有限公司 | Environment-friendly treatment method for sludge of metallurgical rolling molten steel treatment system |
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Application publication date: 20170915 |