The production method of the low silicon low-Ti high-C ferrochronium of mine heat furnace smelting
Technical field
The invention belongs to metallurgical technology field, relate to the hot stove in a kind of ore deposit and smelt the production method of producing low silicon low-Ti high-C ferrochronium continuously, relating in particular to the chrome ore is that the hot stove in raw material ore deposit is smelted the method for producing low silicon low-Ti high-C ferrochronium continuously.
Background technology
In industries such as ferrous metallurgy and castings, high carbon ferro-chrome is widely used as important source material and additive, and along with development of market economy, iron and steel enterprise is more and more harsher to the requirement of high carbon ferro-chrome alloying constituent; In the raw material of the production of special bearing steel, the content of titanium, silicon in the high carbon ferro-chrome alloy is had special requirement, silicone content less than 0.3%, titanium content is increasing less than 0.03% high carbon ferro-chrome product demand.
Chinese patent application numbers 20610022468, a kind of ferrochromium alloy with very low titanium content and high carbon content and production method thereof have been announced, be to be raw material with aboundresources and inexpensive high carbon ferro-chrome, by batching, go into that stove is smelted, steps such as fusion is skimmed, ingot mould cast, smelt the ferrochromium alloy with very low titanium content and high carbon content product that production titaniferous amount is lower than 0.02% advanced level with " selective oxidation method ", its main component is: Cr45~75%, C4~10%, Ti0.001~0.020%, surplus are iron and unavoidable impurities.This method utilizes high carbon ferro-chrome to be raw material, increases by a step production process, and it is higher to consume energy.
Chinese patent application number 01131538 has been announced a kind of process for producing low-Ti high-C ferrochronium, chrome ore: Cr
2O
3〉=40%, Cr/Fe 〉=1.8, (MgO+CaO)/Al
2O
3=1~1.6, Ti≤0.10%, granularity 40mm; Coke: fixed carbon 〉=82%, ash content≤15%, P≤0.025%, Ti≤0.15%, granularity 6~18mm; Silica: SiO
2〉=97%, Al
2O
3≤ 1.5%, washing inclusion-free, granularity 20~40mm; Above-mentioned raw materials mixed to put in the stove smelts, in the stove temperature between 1600~1800 ℃, control slag ternary slag type in smelting process: MgO32~38%, SiO
228~32%, Al
2O
322~27%, in smelting process, in time replenish furnace charge, especially regularly add coke and magnesian in the iron notch zone.
Summary of the invention
The objective of the invention is to solve the problem that prior art exists, providing with chrome ore, coke, silica is that raw material is produced low silicon low-Ti high-C ferrochronium alloy addition by CONTROL PROCESS and basicity of slag etc.; Raw material does not need pre-treatment, is directly smelted by raw material and produces qualified low silicon low-Ti high-C ferrochronium, and need regularly not add charcoal and magnesian at the discharge port place.
The objective of the invention is to be achieved through the following technical solutions: the production method of the low silicon low-Ti high-C ferrochronium of a kind of mine heat furnace smelting, it is characterized in that: with chrome ore, coke, silica is raw material, in mass, chrome ore Cr
2O
3Content 35~42%, granularity are 5~60mm, and coke fixed carbon content 82~86%, granularity are 8~30mm, flux silica SiO
2Content is not less than 97%, granularity is 10~30mm, according to chrome ore: coke: silica=70: 13: 1, by batching center mix after furnace top bin add in the hot stove in 12500KVA ore deposit, smelt through 1550~1750 ℃ of successive, basicity of slag 1.1~1.5, adopt and divide the mode of pouring into a mould behind the slag to produce, the low silicon low-Ti high-C ferrochronium alloy of producing: chromium 55~65%, silicon≤0.3%, titanium≤0.03%, 6.0%<carbon≤10%, sulphur≤0.1%, phosphorus≤0.03%, all the other are iron and other trace element.
The production method of the low silicon low-Ti high-C ferrochronium of above-mentioned mine heat furnace smelting, basicity of slag is controlled to be 1.1~1.25.
The production method of the low silicon low-Ti high-C ferrochronium of above-mentioned mine heat furnace smelting, in the low silicon low-Ti high-C ferrochronium alloy of producing, siliceous amount percentage composition less than 0.3%, titanium quality percentage composition is less than 0.03%.
2.2.4.6 low-Ti high-C ferrochronium ferrochromium high carbon with low titanium among the State Standard of the People's Republic of China GB/T14984.1-2010 " iron alloy term part 1: material ", the titaniferous amount is not more than 0.05% high carbon ferro-chrome.According to above-mentioned national standard and the metallurgy industry standard YB/T4154-2006 of the People's Republic of China (PRC) " low-Ti high-C ferrochronium ", with silicone content of the present invention less than 0.3%, titanium content is defined as " low silicon low-Ti high-C ferrochronium " less than the name of product of 0.03% high carbon ferro-chrome alloy.
The key problem of the production method of the low silicon low-Ti high-C ferrochronium of mine heat furnace smelting of the present invention is for the generation that reduces silicon and titanium with increase the ratio that titanium dioxide enters slag.
The raw material of mentioning among the present invention is processed into desired granularity can guarantee that principal element is fully reduced in continuous smelting process, when smelting ventilation property is preferably arranged simultaneously, and smelting can normally be carried out.
The raw material of mentioning among the present invention joins in the 12500KVA ore-smelting furnace to be smelted through continuous, and its Control for Kiln Temperature is at 1550~1750 ℃, and basicity of slag is controlled at 1.1~1.5 in the smelting process, silicon in the product≤0.3%, titanium≤0.03%; Particularly siliceous amount percentage composition less than 0.3%, titanium quality percentage composition is less than 0.03%.
The low silicon low-Ti high-C ferrochronium of mine heat furnace smelting production of the present invention is a kind of novel stainless steel additive, in its composition siliceous amount percentage composition less than 0.3%, titanium quality percentage composition is less than 0.03%, it is the necessary raw material of producing the special bearing steel, particularly low titanium products can improve the mechanical property of bearing steel, increases the density of bearing steel.
The present invention compared with prior art has following marked improvement and positively effect:
1, simple, the production cost of the low silicon process for producing low-Ti high-C ferrochronium produced of the present invention is starkly lower than prior art.
3, the low silicon low-Ti high-C ferrochronium of the present invention's production is to adopt the hot stove in ore deposit to smelt continuously, and its equipment need not be transformed again, no facility investment, and the smelting technology reasonable in technology adopts the hot stove in industrialization ore deposit to smelt continuously, and its Product Status is good, stable components.
4, the low silicon low-Ti high-C ferrochronium of the present invention's production is thanks to being produced under the carbon condition, and the consumption of ton ferrocoke has reduced by 10% on year-on-year basis, has considerable energy saving and reduces discharging characteristics.
5, the used various raw materials of low silicon low-Ti high-C ferrochronium of the present invention's production can needn't carry out pre-treatment to above-mentioned raw materials directly into mine heat furnace smelting, have shortened technical process, have saved the energy, help improving the rate of recovery of principal element.
Specific embodiments
Now the present invention is further described below in conjunction with concrete practical condition:
The production method of the low silicon low-Ti high-C ferrochronium of mine heat furnace smelting is a raw material with chrome ore, coke, silica, 700 kilograms of chrome ore, 131 kilograms of coke, 10 kilograms of SiO that fixed carbon content 85.89% granularity is 8~30mm that granularity is 5~60mm
2Content 97% granularity is the flux silica of 10~30mm, and the raw material in storage bin is transported to furnace top bin by the automatic weighing of proportioning and after mixing by conveyor, joins in the hot stove in 12500KVA ore deposit by filling tube again; Smelt continuously through 1550~1750 ℃ and to emit in by stove in about 2 hours, the molten iron temperature of coming out of the stove is 1620 ℃, high carbon ferro-chrome alloy and slag are put into hot metal ladle and cinder ladle, and molten iron pours into it in ingot mould after undue slag is handled, and the alloy cooling is after fragmentation, finishing, weighing, warehouse-in.The low silicon low-Ti high-C ferrochronium alloy that mine heat furnace smelting is produced, its quality percentage composition is: chromium 61.55%, silicon 0.17%, titanium 0.0278%, carbon 8.37%, titanium 0.0278%, sulphur 0.048%, phosphorus 0.024%, all the other are iron and other trace element.
The production method of the low silicon low-Ti high-C ferrochronium of above-mentioned smelting, its described raw material chrome ore chemical ingredients and quality percentage composition are:
Chemical ingredients |
Cr
2O
3 |
SiO
2 |
CaO |
MgO |
Al
2O
3 |
Fe |
Ti |
Chrome ore 1 mass content % |
35.64 |
11.7 |
1.54 |
10.74 |
11.88 |
16.33 |
0.32 |
Chrome ore 2 mass content % |
38.31 |
11.54 |
1.12 |
22.26 |
8.41 |
9.38 |
0.08 |
The control basicity of slag is several 1.1~1.25 in the example of the present invention, and slag composition and quality percentage composition thereof are: Cr3.0%, SiO
233.5%, CaO3.5%, MgO38.48%, Al
2O
317.59%, Ti0.3%.Be in order to suppress the reduction of silicon and metal Ti in the smelting process, to increase SiO
2, TiO
2Enter the ratio of slag.
The present invention hangs down silicon low-Ti high-C ferrochronium alloy with the 12500KVA mine heat furnace smelting, and melting electric consumption alloy per ton is 3391KWh, and chrome ore consumption is alloy 2156Kg per ton, and silica consumption is alloy 34Kg per ton, and coke consumption is alloy 435Kg per ton.