CN103866076B - A kind of compact type production method of austenitic stainless steel - Google Patents
A kind of compact type production method of austenitic stainless steel Download PDFInfo
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Abstract
The invention provides a kind of compact type production method of austenitic stainless steel, the method is by script ferronickel, ferrochrome, manganeseirom is produced and four production lines of mixed smelting steel merge into a Production Flow Chart, directly utilize red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes carries out mixed sintering, austenitic stainless steel is produced after smelting, simplify technical process, sintering ignition temperature and mixed carbon comtent are minimized, reduction energy consumption can be played, reduce the effect of production cost, and smelt and directly obtain containing chromium, nickel, the mother liquor of stainless steel of manganese and copper, make it possible to obtained hot mother liquor of stainless steel directly to be entered converter carry out blowing and produce stainless steel, further reduce calorific loss, reduce energy consumption, contribute to the production line simplifying austenitic stainless steel simultaneously, avoid because flow process disperses the equipment control that causes, the problem that maintenance cost increases, for the production technique of austenitic stainless steel opens up a new way.
Description
Technical field
The present invention relates to metallurgical engineering technology and environmental protection and energy saving technical field, particularly relate to a kind of compact type production method of austenitic stainless steel.
Background technology
China's iron and steel output occupies first place in the world, and stainless demand and production capacity also significantly improve.Austenitic stainless steel comes out in Germany for 1913, and in stainless steel, play most important role, its turnout and usage quantity account for 70% of stainless steel ultimate production and consumption always, and chromium nickel system stainless steel accounts for 2/3rds of world's stainless steel output.Austenitic stainless steel, refers to the stainless steel at normal temperatures with austenite structure.In steel containing chromium more than 16%, nickeliferous reach more than 8%, carbon containing about 0.1% time, there is stable austenite structure.Austenitic chromium nickel stainless steel comprises famous 18Cr-8Ni steel and increases Cr, Ni content on this basis and add the high chromium nickel Series Steel that the elements such as Mo, Cu, Si, Nb, Ti grow up.Chromium and nickel produce stainless basic Addition ofelements.All the other elements, such as manganese can increase the stability of austenite when cooling, and suppress austenitic decomposition, the austenite formed under making high temperature is remained to normal temperature; Adding of Cu can improve the solidity to corrosion of austenitic stainless steel in hydrochloric acid, sulfuric acid, phosphoric acid, urea.
Nickel has the features such as anticorrosive, anti-oxidant, high temperature resistant, intensity is high, ductility is good, and thus, it is of many uses.At present in the consumption of nickel, iron and steel and non-ferrous metal metallurgy industry account for 65% ~ 70% of aggregate consumption, and the application proportion especially in stainless steel and refractory steel is maximum.The main source of nickel is respectively nickel sulfide ore and red soil nickel ore, along with the continuous growth of nickel market demand and petering out of nickelous sulfide resource, will have broad prospects to the development and utilization of red soil nickel ore.Proress Technolgies of Laterite-nickel Ore is more, is divided into thermal process and wet processing according to the feature of smelting technology.Thermal process is mainly applicable to process containing the higher red soil nickel ore of Ni grade, and namely the grade of Ni is between 1.5% ~ 3%.Because the Ni grade in red soil nickel ore is low and main tax is stored in other mineral, be suitable for adopting thermal process to smelt.Because China has a large amount of blast furnace, in conjunction with the use of Chinese Government's requirement hard closing small furnace in ferrous metallurgy in recent years, small furnace directly can be applied to the smelting of laterite by the owner of these small furnaces, zero facility investment, economic benefit is higher, and China Coke store content is large, has superiority in fuel.
Chromium always forms chromohercynite (FeO.Cr with iron symbiosis at occurring in nature
2o
3), its mineralogical name is chromite.Because the wettability of chromite is poor, independent chromite powder mine disaster, in granulation balling-up, has a negative impact to sintering effect, and picotite fusing point is higher, and chromite just can produce liquid phase when higher temperature.At present, chromite powder mine sintering by adding the flux such as chlorite, quartzite, serpentine, magnesia and corresponding raising mixed carbon comtent increases amount of liquid phase, promotes sintering, metallurgical effect usually; But this mode carbon consumption is comparatively large, and energy consumption is higher, and the flux added causes the slag kind of follow-up stainless steel smelting operation and quantity discharged to increase, and this just makes enterprises of producing stainless steel face huge energy-saving and emission-reduction pressure; Simultaneously, although the fine ore price of chromite is relatively low, but the flux that chromite powder mine sintering additionally increases and mixed carbon comtent cost, make the advantage of chromite fine ore raw materials cost be difficult to produce in holistic cost at stainless steel significantly embodied, be difficult to reach the object effectively promoting the market competitiveness.
China manganese ore overwhelming majority belongs to lean ore, must carry out ore dressing process.But because most manganese ore belongs to particulate or fine grain teeth cloth, and there are a considerable amount of high phosphorus ore, high iron ore and are total to (companion) raw useful metal, therefore bring great difficulty to ore dressing processing.Ferromanganese produce usually adopt blast furnace smelting process, manganese ore in the process declined by furnace roof, high price manganese oxide (MnO
2, Mn
2o
3, Mn
3o
4) raise with temperature, progressively reverted to MnO by CO.But MnO at high temperature can only be directly reduced to metal by carbon, so ferromanganese smelting needs higher temperature of the furnace hearth, the blast furnace for this reason refining ferromanganese adopts higher coke ratio (about 1600 kgs/tonne) and wind-warm syndrome (more than 1000 DEG C).For reducing manganese loss, slag should keep higher basicity (CaO/SiO
2be greater than 1.3).Because coke ratio is high and indirect reduction rate is low, refine the gas yield of ferromanganese blast furnace and measure higher than iron-smelting blast furnace containing CO, throat temperature is higher (more than 350 DEG C) also.
The production of austenitic stainless steel then needs to depend on the resource allocation such as red soil nickel ore, chromite, manganese ore.Traditional austenitic stainless steel smelting process for production, mainly utilize red soil nickel ore, chromite, manganese ore each via blast-furnace smelting, obtain Rhometal, ferrochrome, manganeseirom respectively, then by Rhometal, ferrochrome, manganeseirom and other add mineral aggregate mix steel making.But along with the continuous growth of market demand, higher-grade red soil nickel ore, chromite, manganese resource are petered out, often need to obtain high-grade ore by ore dressing from low grade ore, for the production of Rhometal, ferrochrome, manganeseirom.But it is less to obtain the usual granularity of high-grade ore by ore dressing, and blast furnace smelting process need utilize lump ore to produce, and this just must obtain mineral aggregate ore dressing and sinter block into, for blast fumance.This just causes adding respective sintering line respectively again in ferronickel, ferrochrome, manganeseirom production line, in order to sinter the lump ore of red soil nickel ore, chromite, manganese ore respectively, respective blast furnace technology line is utilized to smelt the alloy block obtaining Rhometal, ferrochrome, manganeseirom more respectively, transport STEELMAKING PRODUCTION line to, be mixed in proportion and carry out smelting and refining production austenitic stainless steel.Mainly there is the defect of several respects in such traditional technology:
One is that production line is various, technical process is complicated, needs red soil nickel ore, chromite, manganese ore to sinter respectively, smelt the steel-making of rear remix, and more than adding, on bar production line, the cost such as equipment construction, maintenance is higher;
Two is that energy consumption is comparatively large, cost is higher, because the sintering dispersion of red soil nickel ore, chromite, manganese ore causes consumption carbon amounts and heat leakage to increase, and the fusing point that chromite is smelted separately is higher, energy consumption is comparatively large, smelts respectively and also causes the quantity of slag to increase, add the energy-saving and emission-reduction pressure of enterprise simultaneously;
Three is for the ease of transporting STEELMAKING PRODUCTION line to, need to be condensed into alloy block after obtaining Rhometal, ferrochrome, manganeseirom by different production line smelting, cause calorific loss, and the alloy block of ferronickel, ferrochrome, ferromanganese need be reheated in STEELMAKING PRODUCTION line and smelt and consumed energy again, cause many-sided energy consumption to increase.
Therefore, traditional austenitic stainless steel technological process of production is complicated, energy consumption is high, high in cost of production shortcoming is comparatively obvious.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of compact type production method of austenitic stainless steel, in order to simplify austenitic stainless steel production line and technical process, minimizing energy consumption, reduce costs, to solve the problem that the austenitic stainless steel technological process of production in prior art is complicated, energy consumption is high, cost is high.
For achieving the above object, present invention employs following technique means:
A compact type production method for austenitic stainless steel, comprises the steps:
1) compound formed of 40 ~ 46 weight part red soil nickel ores, 15 ~ 20 weight part ferrochrome concentrate, 4 ~ 8 weight part manganese ores, 8 ~ 14 weight part copper ashes, 8 ~ 12 weight part coke powders and 10 ~ 18 weight parts being returned mine adds drum mixer, add water by 18% of described compound gross weight again and carry out mixing granulation, the grate-layer material adopting distributor to be evenly laid on sintering pallet by the mixing pellet after granulating sinters, ignition temperature is 1000 DEG C ~ 1100 DEG C, 1.5 ~ 2 minutes ignition time, exhausting pressure is negative pressure 8 ~ 10kPa;
2) agglomerate obtained by back is cooled to room temperature after carrying out heat broken (≤40mm) process, and recycling vibratory screening apparatus sieves, and agglomerate particle diameter being less than 5mm sinters as next sinter return fine again mixing and granulation;
3) the finished product agglomerate of the remaining 5mm of being greater than is distributed into small furnace to smelt, obtains the heating molten steel containing chromium, nickel, manganese and copper and mother liquor of stainless steel;
4) heating molten steel of gained is transported to converter to carry out blowing and carry out microalloying and obtain hot molten steel;
5) molten steel is carried out external refining, finally obtain stainless steel.
As a kind of prioritization scheme, in described step 1, the waste residue that copper ashes source produces for certain Copper making factory copper metallurgy.
As a kind of prioritization scheme, in described step 1, returning mine is, after chromite and red soil nickel ore mixed sintering obtain before this agglomerate sieves, particle diameter is less than the agglomerate of 5mm as returning mine.
As a kind of prioritization scheme, in described step 1, grate-layer material is after red soil nickel ore and chromite mixed sintering obtain before this agglomerate sieves, using a part of particle diameter be agglomerate between 10 ~ 25mm as grate-layer material, bed material thickness is 20 ~ 25mm.
As a kind of prioritization scheme, in described step 2, after agglomerate carries out hot break process, sintering pallet exhausting is adopted to be cooled to room temperature.
Compared to prior art, the present invention has following beneficial effect:
1, the compact type production method of austenitic stainless steel of the present invention, by script ferronickel, ferrochrome, manganeseirom produces and four production lines of mixed smelting steel merge into a Production Flow Chart, produce austenitic stainless steel after directly utilizing red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes to carry out mixed sintering, smelting, simplify technical process.
In the compact type production method of 2, austenitic stainless steel of the present invention, utilize red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes to carry out mixed sintering smelting, sintering ignition temperature and mixed carbon comtent can be reduced, the effect reducing energy consumption, reduce production cost can be played.
In the compact type production method of 3, austenitic stainless steel of the present invention, the chromium that smelting produces, nickel, manganese, copper are all basic Addition ofelements that austenitic stainless steel is produced, and without the need to adding unnecessary flux, decreasing slag system adjustment and the energy expenditure of subsequent smelting link, contributing to energy-saving and emission-reduction.
4, austenitic stainless steel production method of the present invention is owing to have employed compact sintering, smelting technology, can directly obtain containing chromium, nickel, the mother liquor of stainless steel of manganese and copper, avoid respectively by ferronickel, ferrochrome, the operation of heating smelting stainless steel is mixed in proportion again after the thermalloy liquid of ferromanganese is cooled to alloy block, make the inventive method obtained hot mother liquor of stainless steel directly can be entered converter carry out blowing and produce stainless steel, decrease calorific loss, reduce energy consumption, and make Production Flow Chart compact, contribute to the production line simplifying austenitic stainless steel, avoid because flow process disperses the equipment control that causes, the problem that maintenance cost increases.
5, the copper ashes that in austenitic stainless steel production method of the present invention, the source of copper can select copper metallurgy to produce, thus the effect playing Appropriate application secondary resource, increase factory benefit.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the compact type production method of austenitic stainless steel of the present invention.
Embodiment
The problem complicated for the austenitic stainless steel technological process of production in prior art, energy consumption is high, cost is high, the present invention proposes a kind of compact type production method of austenitic stainless steel, the method adopts new sintering, smelts integrated scheme, original ferronickel, ferrochrome, manganeseirom to be produced and four production lines of mixed smelting steel merge into the Production Flow Chart of a compact type, reach to simplify the production line of austenitic stainless steel and technical process, minimizing energy consumption, the object that reduces costs.In addition, the copper ore resource of China has the advantages that intergrowth mineral is many, grade is low, for the copper ashes system of enormous amount, there is a large amount of secondary resources that can recycle, China is also faced with the severe situation of the non-ferrous metal reserves deficiencies such as copper simultaneously, in the compact type production method of austenitic stainless steel of the present invention, the copper ashes that copper metallurgy can be selected to produce is as the source of copper in steel-making, Appropriate application secondary resource, increases the performance of enterprises, can reduce quantity of slag discharge simultaneously.And the integration of ferronickel, ferrochrome, manganeseirom sintering, smelting production line also contributes to reducing energy consumption, reducing deslagging, is conducive to energy-saving and emission-reduction.
Specifically, as described in Figure 1, it comprises the steps: the flow process of the compact type production method of austenitic stainless steel of the present invention
1) compound formed of 40 ~ 46 weight part red soil nickel ores, 15 ~ 20 weight part ferrochrome concentrate, 4 ~ 8 weight part manganese ores, 8 ~ 14 weight part copper ashes, 8 ~ 12 weight part coke powders and 10 ~ 18 weight parts being returned mine adds drum mixer, add water by 18% of described compound gross weight again and carry out mixing granulation, obtain mixing pellet;
2) on sintering pallet, grate-layer material is laid;
3) grate-layer material adopting distributor to be evenly laid in by described mixing pellet on sintering pallet sinters, ignition temperature is 1000 DEG C ~ 1100 DEG C, 1.5 ~ 2 minutes ignition time, exhausting pressure is negative pressure 8 ~ 10kPa, obtain agglomerate;
4) agglomerate obtained by back is cooled to room temperature after carrying out hot break process, recycling vibratory screening apparatus sieves, particle diameter is less than agglomerate the returning mine as after this austenitic stainless steel production of 5mm, get the grate-layer material of agglomerate as after this austenitic stainless steel production that a part of particle diameter is 10 ~ 25mm, the finished product agglomerate remaining particle diameter being greater than 5mm is distributed into small furnace and smelts, and obtains heating molten steel containing chromium, nickel, manganese and copper as mother liquor of stainless steel;
5) mother liquor of stainless steel of gained is directly transported to converter to carry out blowing and carry out microalloying and obtain hot molten steel;
6) hot molten steel is carried out external refining, finally obtain austenitic stainless steel.
Chromium, nickel, manganese, copper are all basic Addition ofelements that austenitic stainless steel is produced, the present invention by script ferronickel, ferrochrome, manganeseirom produces and four production lines of mixed smelting steel merge into a Production Flow Chart, produce austenitic stainless steel after directly utilizing red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes to carry out mixed sintering, smelting, therefore greatly can simplify process flow.In addition, the independent smelting process of red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes four kinds of raw materials is the highest with the smelting temperature of chromite, and because the wettability of chromite is poor, independent chromite powder mine disaster is in granulation balling-up, sintering effect is had a negative impact, therefore often need by adding the flux such as chlorite, quartzite, serpentine, magnesia and corresponding raising mixed carbon comtent increases amount of liquid phase in prior art, promote sintering, metallurgical effect, thus cause the problem that energy consumption is high, cost is high obvious, be unfavorable for energy-saving and emission-reduction.In the compact type production method of austenitic stainless steel of the present invention, utilize red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes to be mixed together and granulate and sintering, except the fundamental element that austenitic stainless steel is provided, the effect reducing energy consumption and cost can also be played.Because; in mixing granulation link; due to red soil nickel ore and manganese ore good to the wettability of water; in pelletization; red soil nickel ore and manganese ore just can adhere to as forming core particle and chromite circumstances mutually grows up, and granulates agglomerating, thus solves chromite powder mine disaster in the problem of granulating; the ventilation property that acquisition mixing pellet of granulating can make to sinter is better, thus can help reduce sintering energy consumption and obtain better sintering effect.On the other hand, in sintering link, the main component chromium sesquioxide (Cr of chromite
2o
3), aluminum oxide (Al
2o
3) fusing point higher (1450 DEG C ~ 1500 DEG C), the silicon-dioxide (SiO that fusing point is lower
2), the content ratio of the composition such as magnesium oxide (MgO) is relatively low, and the liquid phase that in sintering process, chromite self produces is mainly silicate, therefore the amount of liquid phase himself produced is less, therefore need by higher ignition temperature or add flux, increase mixed carbon comtent to increase slag liquid phase, and silicon-dioxide (SiO in red soil nickel ore and manganese ore
2), magnesium oxide (MgO) content ratio is relatively high, can more liquid phases be produced under comparatively low ignition temperature and mixed carbon comtent condition, thus help to improve sintering quality, reduce sintering energy consumption; Meanwhile, red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes metallurgical slag set member are close, are all mainly Al
2o
3, SiO
2and MgO, the subsequent smelting deslagging operation that austenitic stainless steel is produced can not be increased, and chromite smelts SiO in slag system
2, the low Al of content of MgO
2o
3content is high, and adding of red soil nickel ore, manganese ore, copper ashes can help to improve SiO
2, MgO slag system content, and then help to shorten the adjustment smelting cycle of slag system, reduce and smelt production cost; Thus, the present invention is without the need to the extra flux high by the price such as chlorite, magnesia, under lower mixed carbon comtent condition, only need to control the sintering environment that ignition temperature is 1000 DEG C ~ 1100 DEG C, 1.5 ~ 2 minutes ignition time, exhausting pressure are negative pressure 8 ~ 10kPa to sinter, just good sintering effect can be guaranteed, improve agglomerate yield rate and intensity, avoid because of the extra problem of adding flux and causing mixed carbon comtent increase, energy consumption and cost to increase.Thus, austenitic stainless steel production method of the present invention utilizes red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes to be mixed together and granulates and sintering, just solves chromite powder mine disaster in prior art in granulating and sintering, energy consumption is high, cost is high problem.In addition, austenitic stainless steel production method of the present invention is owing to have employed compact sintering, smelting technology, can directly obtain containing chromium, nickel, the mother liquor of stainless steel of manganese and copper, avoid respectively by ferronickel, ferrochrome, the operation of heating smelting stainless steel is mixed in proportion again after the thermalloy liquid of ferromanganese is cooled to alloy block, make the inventive method obtained hot mother liquor of stainless steel directly can be entered converter carry out blowing and produce stainless steel, further decrease calorific loss, reduce energy consumption, and make Production Flow Chart compact, contribute to the production line simplifying austenitic stainless steel, avoid because flow process disperses the equipment control that causes, the problem that maintenance cost increases.
The compact type production method of the austenitic stainless steel that the present invention is above-mentioned, in its step 1, copper ashes is originated the waste residue that the copper metallurgy of Copper making factory can be selected to produce, and Appropriate application secondary resource, to increase the performance of enterprises.On the other hand, what adopt in step 1 returns mine, can be before this austenitic stainless steel produce in after the agglomerate that obtains of red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes, coke powder and mixed sintering of returning mine sieves, particle diameter is less than the agglomerate of 5mm as returning mine.Because it is too small and be unfavorable for that follow-up stainless steel is produced that particle diameter is less than the agglomerate particle diameter of 5mm, but the grades such as its institute is nickeliferous, chromium, manganese are higher, and surface irregularity, mutually can adhere to as forming core particle and other mineral aggregate when mixed pelletizing and grow up, be conducive to granulating, therefore not only can reclaim the elements such as nickel, chromium, manganese as returning mine, but also can mixing granulation be helped.In step 2, after the agglomerate that during grate-layer material also can adopt austenitic stainless steel before this to produce, red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes, coke powder and mixed sintering of returning mine obtain sieves, be that agglomerate between 10 ~ 25mm is as grate-layer material using a part of particle diameter, grate-layer material thickness is 20 ~ 25mm, in order to reduce the ratio that grid section burns out, ensure exhausting amount and ventilation effect, avoid sintered material to be bonded on grate bar and reduce exhausting area, stop that fine particle enters bellows with waste gas and shortens the vacuum fan life-span.In step 4, hot break process is carried out to agglomerate, preferably require that broken rear agglomerate particle diameter is less than or equal to 40mm, make it meet follow-up stainless steel Production Flow Chart to the requirement of raw material granularity; In addition, after agglomerate carries out hot break process in step 4, can also directly adopt sintering pallet exhausting to be cooled to room temperature, so both can promoting cooling process efficiency, and again without the need to increasing other cooling apparatus, better can save cost.
Below in conjunction with embodiment, technical scheme of the present invention is further described.
embodiment:
Embodiments of the invention material chemical component used is as shown in table 1, and the technical analysis of coke powder used is as shown in table 2.
Table 1 material chemical component (%)
The technical analysis of table 2 coke powder
embodiment one:
The compound formed of 46 weight part red soil nickel ores, 16 weight part ferrochrome concentrate, 6 weight part manganese ores, 14 weight part copper ashes, 8 weight part coke powders and 10 weight parts being returned mine adds drum mixer, add water by 18% of described compound gross weight again and carry out mixing granulation, the grate-layer material adopting distributor to be evenly laid on sintering pallet by the mixing pellet after granulating sinters, ignition temperature is 1050 DEG C, 2 minutes ignition time, exhausting pressure is negative pressure 8 ~ 10kPa.Be cooled to room temperature after the agglomerate obtained being carried out heat broken (≤40mm) process, recycling vibratory screening apparatus sieves, and surveys the physicals of agglomerate.Obtain the yield rate of agglomerate, dropping strength, barrate strength, anti-wear index be respectively 68.85%, 73.23%, 49.18%, 20.10%.The finished product agglomerate being greater than 5mm is distributed into small furnace smelt, obtain the heating molten steel containing chromium, nickel, manganese and copper and mother liquor of stainless steel, in mother liquor of stainless steel, Mn, Cu, Cr, Fe, Ni content is respectively 3.81%, 0.62%, 16.02%, 73.26%, 1.41%.As a rule, the amount of Cr, Ni, Mn, Cu contained by austenitic stainless steel is respectively 16.00% ~ 19.00%, 8.00% ~ 11.00% ,≤2.00% ,≤1.00%, can see, Cr, Cu that in the present embodiment, the mother liquor of stainless steel of gained contains have reached the requirement of austenitic stainless steel all.The hot mother liquor of stainless steel of gained is transported to converter to carry out blowing and carry out microalloying and obtain hot molten steel.Finally external refining is carried out to hot molten steel, obtain austenitic stainless steel.
embodiment two:
The compound formed of 45 weight part red soil nickel ores, 15 weight part ferrochrome concentrate, 5 weight part manganese ores, 10 weight part copper ashes, 10 weight part coke powders and 15 weight parts being returned mine adds drum mixer, add water by 18% of described compound gross weight again and carry out mixing granulation, the grate-layer material adopting distributor to be evenly laid on sintering pallet by the mixing pellet after granulating sinters, ignition temperature is 1050 DEG C, 2 minutes ignition time, exhausting pressure is negative pressure 8 ~ 10kPa.Be cooled to room temperature after the agglomerate obtained being carried out heat broken (≤40mm) process, recycling vibratory screening apparatus sieves, and surveys the physicals of agglomerate.Obtain the yield rate of agglomerate, dropping strength, barrate strength, anti-wear index be respectively 72.32%, 75.86%, 51.49%, 19.21%.The finished product agglomerate being greater than 5mm is distributed into small furnace smelt, obtain the heating molten steel containing chromium, nickel, manganese and copper and mother liquor of stainless steel, in mother liquor of stainless steel, Mn, Cu, Cr, Fe, Ni content is respectively 3.32%, 0.48%, 17.50%, 72.13%, 1.20%.Cr, Cu that in the present embodiment, the mother liquor of stainless steel of gained contains have reached the requirement of austenitic stainless steel all.The hot mother liquor of stainless steel of gained is transported to converter to carry out blowing and carry out microalloying and obtain hot molten steel.Finally external refining is carried out to hot molten steel, obtain austenitic stainless steel.
embodiment three:
The compound formed of 42 weight part red soil nickel ores, 19 weight part ferrochrome concentrate, 4 weight part manganese ores, 8 weight part copper ashes, 11 weight part coke powders and 16 weight parts being returned mine adds drum mixer, add water by 18% of described compound gross weight again and carry out mixing granulation, the grate-layer material adopting distributor to be evenly laid on sintering pallet by the mixing pellet after granulating sinters, ignition temperature is 1050 DEG C, 2 minutes ignition time, exhausting pressure is negative pressure 8 ~ 10kPa.Be cooled to room temperature after the agglomerate obtained being carried out heat broken (≤40mm) process, recycling vibratory screening apparatus sieves, and surveys the physicals of agglomerate.Obtain the yield rate of agglomerate, dropping strength, barrate strength, anti-wear index be respectively 75.54%, 78.95%, 54.87%, 17.29%.The finished product agglomerate being greater than 5mm is distributed into small furnace smelt, obtain the heating molten steel containing chromium, nickel, manganese and copper and mother liquor of stainless steel, in mother liquor of stainless steel, Mn, Cu, Cr, Fe, Ni content is respectively 2.64%, 0.37%, 18.00%, 72.15%, 1.30%.Cr, Cu that in the present embodiment, the mother liquor of stainless steel of gained contains have reached the requirement of austenitic stainless steel all.The hot mother liquor of stainless steel of gained is transported to converter to carry out blowing and carry out microalloying and obtain hot molten steel.Finally external refining is carried out to hot molten steel, obtain austenitic stainless steel.
embodiment four:
The compound formed of 40 weight part red soil nickel ores, 20 weight part ferrochrome concentrate, 4 weight part manganese ores, 12 weight part copper ashes, 12 weight part coke powders and 12 weight parts being returned mine adds drum mixer, add water by 18% of described compound gross weight again and carry out mixing granulation, the grate-layer material adopting distributor to be evenly laid on sintering pallet by the mixing pellet after granulating sinters, ignition temperature is 1050 DEG C, 2 minutes ignition time, exhausting pressure is negative pressure 8 ~ 10kPa.Be cooled to room temperature after the agglomerate obtained being carried out heat broken (≤40mm) process, recycling vibratory screening apparatus sieves, and surveys the physicals of agglomerate.Obtain the yield rate of agglomerate, dropping strength, barrate strength, anti-wear index be respectively 74.88%, 76.74%, 52.92%, 18.73%.The finished product agglomerate being greater than 5mm is distributed into small furnace smelt, obtain the heating molten steel containing chromium, nickel, manganese and copper and mother liquor of stainless steel, in mother liquor of stainless steel, Mn, Cu, Cr, Fe, Ni content is respectively 2.53%, 0.49%, 18.16%, 72.30%, 1.05%.Cr, Cu that in the present embodiment, the mother liquor of stainless steel of gained contains have reached the requirement of austenitic stainless steel all.The hot mother liquor of stainless steel of gained is transported to converter to carry out blowing and carry out microalloying and obtain hot molten steel.Finally external refining is carried out to hot molten steel, obtain austenitic stainless steel.
Can see from the related data of above-described embodiment, adopt in austenitic stainless steel production method of the present invention, all comparatively excellent by every physical index such as yield rate, dropping strength, barrate strength, anti-wear index of red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes mixing granulation, sintering gained agglomerate, ensure that the metallurgical performance of agglomerate preferably, for subsequent smelting provides excellent feed stock for blast furnace; And in the mother liquor of stainless steel obtained after small furnace is smelted, Cr, Cu content has reached the requirement of austenitic stainless steel all, therefore in follow-up blowing and refining flow process, only need the steel grade production requirement according to austenitic stainless steel, adopt existing blowing and refinery practice to be adjusted composition, just can realize the production of austenitic stainless steel.
In sum, relative to existing austenitic stainless steel production technique, the compact type production method of austenitic stainless steel of the present invention has the advantage that technical process is simple, energy consumption is low, cost is low, effectively can solve the problem that the existing austenitic stainless steel technological process of production is complicated, energy consumption is high, cost is high, and contribute to the production line simplifying austenitic stainless steel, the problem that the equipment control avoiding disperseing to cause because of flow process, maintenance cost increase, for the production technique of austenitic stainless steel opens up a new way.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. a compact type production method for austenitic stainless steel, is characterized in that, comprise the steps:
1) compound formed of 40 ~ 46 weight part red soil nickel ores, 15 ~ 20 weight part ferrochrome concentrate, 4 ~ 8 weight part manganese ores, 8 ~ 14 weight part copper ashes, 8 ~ 12 weight part coke powders and 10 ~ 18 weight parts being returned mine adds drum mixer, add water by 18% of described compound gross weight again and carry out mixing granulation, obtain mixing pellet; The waste residue that described copper ashes source produces for the copper metallurgy of Copper making factory;
2) on sintering pallet, grate-layer material is laid;
3) grate-layer material adopting distributor to be evenly laid in by described mixing pellet on sintering pallet sinters, ignition temperature is 1000 DEG C ~ 1100 DEG C, 1.5 ~ 2 minutes ignition time, exhausting pressure is negative pressure 8 ~ 10kPa, obtain agglomerate;
4) agglomerate obtained by back is cooled to room temperature after carrying out hot break process, recycling vibratory screening apparatus sieves, particle diameter is less than agglomerate the returning mine as after this austenitic stainless steel production of 5mm, get the grate-layer material of agglomerate as after this austenitic stainless steel production that a part of particle diameter is 10 ~ 25mm, the finished product agglomerate remaining particle diameter being greater than 5mm is distributed into small furnace and smelts, and obtains heating molten steel containing chromium, nickel, manganese and copper as mother liquor of stainless steel;
5) mother liquor of stainless steel of gained is directly transported to converter to carry out blowing and carry out microalloying and obtain hot molten steel;
6) hot molten steel is carried out external refining, finally obtain austenitic stainless steel.
2. the compact type production method of a kind of austenitic stainless steel according to claim 1, it is characterized in that, in described step 2, grate-layer material be before this austenitic stainless steel produce in after the agglomerate that obtains of red soil nickel ore, ferrochrome concentrate, manganese ore, copper ashes, coke powder and mixed sintering of returning mine sieves, using a part of particle diameter be agglomerate between 10 ~ 25mm as grate-layer material, grate-layer material thickness is 20 ~ 25mm.
3. the compact type production method of a kind of austenitic stainless steel according to claim 1, is characterized in that, in described step 4, carries out hot break process to agglomerate, requires that broken rear agglomerate particle diameter is less than or equal to 40mm.
4. the compact type production method of a kind of austenitic stainless steel according to claim 1, is characterized in that, in described step 4, after agglomerate carries out hot break process, adopts sintering pallet exhausting to be cooled to room temperature.
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| CN106282544B (en) * | 2015-05-28 | 2018-05-29 | 鞍钢股份有限公司 | Spraying agent for reducing edge effect of sintering trolley and using method |
| CN108193123B (en) * | 2017-12-29 | 2019-12-24 | 钢研晟华科技股份有限公司 | Corrosion-resistant steel bar and preparation method thereof |
| CN110106347B (en) * | 2019-05-15 | 2020-04-21 | 中南大学 | Treatment method for applying copper smelting waste residues to sintering |
| CN110042227B (en) * | 2019-05-23 | 2021-08-03 | 中国恩菲工程技术有限公司 | Sintered ore and preparation method thereof |
| CN115354214A (en) * | 2022-09-30 | 2022-11-18 | 日照钢铁控股集团有限公司 | Method for producing weathering steel with low energy consumption, low carbon emission and low cost |
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