CN1076967A

CN1076967A - The processing method of steel-smelting from waste metal filings

Info

Publication number: CN1076967A
Application number: CN92112687A
Authority: CN
Inventors: 赵铁鉴
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-10-27
Filing date: 1992-10-27
Publication date: 1993-10-06
Anticipated expiration: 2007-10-27
Also published as: CN1027546C

Abstract

The present invention relates to the processing method of metal filings steel-smelting.The present invention by raw material, de-oiled water, scalping sorting, fragmentation, ball milling, fine screen sorting, helical stir, ragging, concentrate lifting, refining-sorting, precipitation dehydration, smart former feed bin, disk feeder, balling-up, sintering, direct current furnace, slag tap, tap, water processing method such as ingot finished product, can make metal filings wet feeds such as containing C, Si, Mn, Cr, Mo, V, W reclaim yield rate is 54.4%, and it is 73.5% that siccative reclaims yield rate.

Description

The processing method of steel-smelting from waste metal filings

The invention belongs to field of steel-making, particularly relate to the recycling of scrap metal abrasive dust.

The mechanical part of present China machinery manufacturing industry, the very high grinding machine that all adopts of precision prescribed and smooth finish carries out precision work, process with grinding machine, the a large amount of abrasive dust (being commonly called as grinding wheel froth) of annual generation all goes out of use, throw away as industrial refuse throughout the year, this not only brings very large economy loss to society, causes huge waste to national resources simultaneously.Only in Harbin City's machinery industry, just produce more than 40,000 ton of abrasive dust per year according to the preliminary statistics.Contain valuable metallic element in the abrasive dust, as Cr, Mo, V, W, Ti etc.Reclaim at present method, the equipment, many of scrap metal bits steel-smelting, for example: with the method for steel scrap bits steel-smelting, application number: 88105088,1 it be the method for melting steel cuttings.

In order to recycle the scrap metal foam effectively, the invention provides that a kind of power consumption is low, the rate of recovery is high, the processing method with steel-smelting from waste metal filings of less investment.

For realizing the object of the invention, the following processing method of embodiment of the present invention: Fig. 1.

Raw material 18 degree are to more than 20 degree, more than 30 day naturally dehydration or by drying oven at 4-5 hundred degree temperature dryings more than 3 hours, carry out de-oiled water, behind de-oiled water, first via raw material enters crusher greater than the bulk of 3-5mm and carries out fragmentation, the second road raw material behind de-oiled water is greater than the ball mill that enters of 1mm, Third Road raw material behind de-oiled water is less than the helical stir that enters of 1mm, the first via, the second the tunnel enters and enters the fine screen sorting after ball mill is less than 1mm, choose at the fine screen branch and to add water and carry out abrasive dust and enter helical stir after the separating of grinding wheel froth ash in early stage, enter ragging again, carry out sorting by magnetic separator, the pure metal foam directly enters the precipitation dehydration, and also available centrigugal swing dryer dries, and contains nickel, stainless steel, copper-manganese, aluminium etc. belong to not to be inhaled the magnetic metal species and enters shaking table and carry out sorting.Then enter the precipitation dehydration, enter concentrated the lifting by ragging, abrasive dust and cooling fluid are concentrated and rise to the refining-sorting machine carry out refining-sorting, after muddy water part of abrasive dust and emery wheel ash removed, correct grinding bits are sent into smart former feed bin with separating agent, sintering solvent, composite deoxidant, the agent of adjustment element, mix except that the agent of molten steel harmful element enters disc feeder by lift, after becoming compound, enter nodulizer, to 1500 degree, carry out sintering at 1300 degree after the balling-up, the compound part is dissolved, generate liquid phase.Join and carry out molten refining deoxidation in the direct current furnace.Before water outlet is wanted in steel-making, add additive, less than 1%.Thereby slag tap earlier, afterwards tap, direct current furnace, the processing sequence of slagging tap, tap all are to control toppling over of stove by hydraulic efficiency system.Hydraulic efficiency system is made up of toothed gear pump, distribution valve, oil cylinder.

The present invention is according to the above-mentioned processing method with steel-smelting from waste metal filings that principle provided, have following advantage: power consumption is low, about melting steel abrasive dust per ton consumed power 1500 degree, and the metal recovery rate height, wet feed reclaims yield rate will be 54.4%, and siccative reclaims yield rate will be 73.5%.Calculate by 380 tons of grinding wheel froths at present, produce 200 tons on steel ingot, enterprise profit is 160,000 yuan.Use this steel ingot as returning the remelting steel scrap as steel mill, can add 52.5 kilograms of iron alloy tungstenics per ton (mean value) less, be converted into 75 kilograms of ferrotungstens, 26,000 yuan of ferrotungstens per ton; 31.8 kilograms of the molybdenums that contain per ton are converted into 57.8 kilograms of molybdenum-irons, 29000 yuan of molybdenum-irons per ton, and 22.5 kilograms of the chromium that contain per ton are converted into 37.5 kilograms in ferrochrome, 4660 yuan in ferrochrome per ton, 9.2 kilograms of the vanadium that contain per ton are converted into 18.4 kilograms of vanadium iron, 58,500 yuan of vanadium iron per ton.When using this steel ingot melting as steel mill, metal charge per ton can add the alloy of above-mentioned quantity less, only to use 200 tons of calculating every year, can save 15 tons of ferrotungstens in 1 year, 7.5 tons of molybdenum-irons, 3.68 tons of vanadium iron, and this all considers alloy scaling loss amount in the end.Then annual only this item steel mill can save 1,234,018.00 yuan, the equal energy source consumption of can economizing on electricity in addition, economize on coal.

The embodiment of the invention.

Raw material abrasive dust (grinding wheel froth) generally is loose shape, and oil-containing (containing small amount of moisture about 18.8%) contains other impurity about 30% after measured.Through above more than the 30 day natural de-oiled water (promptly stacking down in the open) of 18 degree-20 degree or with turn round or kiln dried after, carry out ragging with vibratory screening apparatus: bulk impurity is that waste material is thrown away; Entering crusher in crushing greater than the block raw material of 3-5mm then enters ball mill and wears into and enter refining-sorting below the 1mm; Raw material greater than 1mm directly enters ball mill; Raw material less than 1mm directly enters helical stir, when vibratory screening apparatus carries out ragging, for the protection environmental health, carries out environmental dust removal with fly-ash separator.Choose at the fine screen branch, raw material less than 1mm enters helical stir, other in helical stir, the following raw material of 1mm carries out abrasive dust and the separating of emery wheel ash in early stage, enters ragging then, carries out sorting with magnetic separator, pure metal is promptly dewatered by the precipitation that directly enters that magnetic separator sucts, the metal that can be magnetized that contains oil, ash then enters thickner, and raw materials such as nickeliferous, stainless steel then enter separation by shaking table, then then enters the precipitation dehydration.In concentrating lifting, carry out concentration, and rise to the refining-sorting machine.Lifting realizes with propeller pump.

Precipitation dehydration one is to use settling tank, takes off abrasive dust and emery wheel ash moisture content with certain hour, the 2nd, dry with centrigugal swing dryer, and be that pure abrasive dust is sent into smart former feed bin by lift through the smart raw material after the precipitation dehydration,

The reductor that smart raw material comes with the separating agent storehouse, composite deoxidant, adjustment alloying element addition agent, remove in the molten steel additive such as harmful element agent join mix in the disc feeder after, enter nodulizer again, make the spherical sinter machine that enters in the diameter 30mm left and right sides, at 1500 degree left and right sides sintering, the ball part of compound is dissolved, after generating liquid phase, add direct current furnace.But the needs that are far longer than direct current furnace that sintering comes out in the actual production.After the sintering circuit cooling, particle is just formed bulk mutually.Before entering direct current furnace the bulk behind the sintering is warmed to 800 degree by pot arch and enters and carry out melting in the direct current furnace to 1000 degree, the purpose of heating is to reduce the steel-making time, simultaneously saves energy etc.Electric furnace adopts water-cooled to cool off, and adopts hydraulic efficiency system to slag tap, tap.Before water outlet is wanted in steel-making, add additive less than 1%, reach steel and separate with slag, slag tap earlier, afterwards tap.Slag after rolling, tapping is directly poured molten steel into the steel ingot car and is become steel ingot.

Claims

A kind of processing method that contains steel-smelting from waste metal filings, it is characterized in that: raw material is more than 18 degree, more than 30 day naturally the dehydration or by drying oven 400～500 the degree temperature, dry more than 3 hours, carry out de-oiled water, behind de-oiled water, first via raw material enters crusher greater than the bulk of 3～5mm and carries out fragmentation, the second road raw material behind de-oiled water is greater than the ball mill that enters of 1mm, Third Road raw material behind de-oiled water is less than the helical stir that enters of 1mm, the first via, the second the tunnel enters and enters the fine screen sorting after ball mill is less than 1mm, choose at the fine screen branch and to add water and carry out abrasive dust and enter helical stir after the separating of emery wheel end ash in early stage, enter ragging again, carry out sorting by magnetic separator, the pure metal end directly enters the precipitation dehydration, contain nickel, stainless steel etc. or non-ferrous metal, enter shaking table, carry out sorting, then enter the precipitation dehydration, enter concentrated the lifting by ragging, concentrate abrasive dust and cooling fluid and promote the refining-sorting machine to carry out refining-sorting, after the muddy water branch of abrasive dust and emery wheel ash removed, correct grinding bits are sent into smart former feed bin by lift to be entered disk feeder with separating agent and mixes, after becoming compound, enter nodulizer, in 1300～1500 degree, carry out sintering after the balling-up, the compound part is dissolved, generate liquid phase, join and carry out molten refining in the direct current furnace, before water outlet is wanted in steel-making, add additive, thereby slag tap earlier, the back tapping, direct current furnace is slagged tap, tapping, all be to control toppling over of stove by hydraulic efficiency system, hydraulic efficiency system is by toothed gear pump, distribution valve, oil cylinder is formed, the scalping sorting, ball milling, when working, the separating agent storehouse connects fly-ash separator.