CN101665847A - Process for recovering iron by smelting reduction of electric furnace slag - Google Patents
Process for recovering iron by smelting reduction of electric furnace slag Download PDFInfo
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- CN101665847A CN101665847A CN200910067564A CN200910067564A CN101665847A CN 101665847 A CN101665847 A CN 101665847A CN 200910067564 A CN200910067564 A CN 200910067564A CN 200910067564 A CN200910067564 A CN 200910067564A CN 101665847 A CN101665847 A CN 101665847A
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Abstract
The invention relates to a black metal smelting technology for recovering iron resources in electric furnace slag produced in non-ferrous metallurgical process. The black metal smelting technology comprises the following steps: adding molten electric furnace slag in a smelting reduction furnace directly; and then adding calcium oxide which is used as a slagging constituent and accounts for 20-50 percent of the weight of raw material according to the impurity components in the raw material; spraying coal powder; keeping the electric furnace slag at 1400-1600 DEG C to carry out smelting reduction for 20-180 minutes; pouring produced molten iron in a desulfuration barrel for desulfurating and refining; and ingotting to obtain qualified pig iron products when the sulphur content of the molteniron reaches the standard of the sulphur content of pig iron. The black metal smelting technology has the advantages of simple process, low cost and high recovering rate and easy popularization.
Description
Technical field:
The present invention relates to a kind of black metal smelting technology, is the recovery of the electric furnace slag of output in the Nonferrous Metallurgical Process being carried out iron resources.
Background technology:
Domestic producer and the pertinent literature report that does not still have iron resources in the recovery electric furnace slag at present belongs to domestic initiation.There is data to introduce Greece La Ruimuna mining and metallurgy company produces steel from the by product scum of electrosmelting ferronickel technology abroad, iron level is 41% in its scum, in electric furnace, reclaim smelt iron in 1400 ℃, iron recovery reached 92% in 80-100 minute, in converter, make steel after the secondary desulfurization, but its iron loss electricity 1700-2000kwh per ton.Because China's electric rate is more much higher than abroad, press 2000kwh and calculate, electricity price was that every kwh is 0.45 yuan at that time, the power consumption expense of iron is 900 a yuan/t iron.Add again that other is artificial, the charges for water and electricity cost may be broken through 1000 yuan/t iron.So the electrosmelting cost also needs The effect in interim test.
The novel process of recovering iron by smelting reduction of electric furnace slag is not seen the relevant report consistent with this technology through update search.(novelty assessment report conclusion).
After the colored metallurgical industrial waste residue is meant that employing is smelted purpose metals such as extracting copper, lead, zinc, nickel, antimony, aluminium, tin, mercury with primary ore or work in-process, the solid waste that emits.Nonferrous smelting is a complex physicochemical process, smelts the waste residue that is given off behind the purpose metal and mostly is complicated mixture or compound.These waste residues not only will take the soil of a large amount of stackings, and cause environmental pollution, and particularly poisonous and harmful metal pair underground water source seriously polluted threatening that millions upon millions of people's is healthy.
At present, China's coloured industry solid waste annual emissions is 6,590 ten thousand tons, accounts for 10.6% of national total release.Wherein mine tailing and red mud are 5,894 ten thousand tons, 3,370,000 tons of metallurgical slags, 1,440,000 tons of boiler ashs, 380,000 tons of chemical sludges.Now handled and fully utilized 4,740,000 tons, occupied 7.2% of look using industrial solid waste, be significantly less than the mean level (ML) in the whole nation 25.6%.Therefore, the development and use secondary resource is that form is compeled, and has bigger society, economy and environmental benefit.
Summary of the invention
Purpose of the present invention is exactly at above-mentioned the deficiencies in the prior art, provides a kind of new smelting technology comprehensively to reclaim iron in the electric furnace slag.
The objective of the invention is to realize in the following manner:
The technology of recovering iron by smelting reduction of electric furnace slag comprises following order and step:
The electric furnace slag of a, molten state directly joins in the fusion reducing furnace;
B, press raw material weight per-cent according to impurity component in the raw material and add 20～50% slag formers;
C, spray into coal dust and make electric furnace slag remain on 1400 ℃～1600 ℃ temperature;
D, carried out fused reduction iron-smelting 30～180 minutes;
The molten iron of e, smelting output injects desulfurization bucket desulfurizing and refining, makes sulphur content reach pig iron sulfur-bearing standard;
F, ingot casting obtain qualified cast iron product.
Purpose of the present invention can also realize in the following manner:
Slag former described in the step b is calcium oxide, silicon-dioxide, fluorite, borax yellow soda ash.
Beneficial effect: this technology is intended to handle the byproduct electric furnace slag of smelting, makes full use of its heat enthalpy value of 1300 ℃, adopts the melting and reducing technology, reclaims the iron more than 30% in the electric furnace slag.Obtain cast iron product through after the conventional electric furnace refining, technology is simple, and is with low cost, and rate of recovery height is easy to promote.
Description of drawings
Accompanying drawing: the process flow sheet of recovering iron by smelting reduction of electric furnace slag.
Embodiment
Be described in further detail below in conjunction with drawings and Examples
The technology of recovering iron by smelting reduction of electric furnace slag comprises following order and step:
The electric furnace slag of a, molten state directly joins in the fusion reducing furnace;
B, press raw material weight per-cent according to impurity component in the raw material and add 20～50% slag formers;
C, spray into coal dust and make electric furnace slag remain on 1400 ℃～1600 ℃ temperature;
D, carried out fused reduction iron-smelting 30～180 minutes;
The molten iron of e, smelting output injects desulfurization bucket desulfurizing and refining, makes sulphur content reach pig iron sulfur-bearing standard;
F, ingot casting obtain qualified cast iron product.
Slag former described in the step b is calcium oxide, silicon-dioxide, fluorite, borax yellow soda ash.
Embodiment 1
The electric furnace slag of a, molten state directly joins in the fusion reducing furnace;
B, add 45% the calcium oxide account for raw material weight according to impurity component in the raw material;
C, spray into coal dust, make electric furnace slag remain on 1450 ℃ of temperature;
D, carried out fused reduction iron-smelting 60 minutes;
The molten iron of e, smelting output injects desulfurization bucket desulfurizing and refining, makes sulphur content reach pig iron sulfur-bearing standard;
F, ingot casting obtain qualified cast iron product.
Embodiment 2
The electric furnace slag of a, molten state directly joins in the fusion reducing furnace;
B, add 20% the calcium oxide account for raw material weight and the fluorite that adds 5% according to impurity component in the raw material;
C, spray into coal dust, make electric furnace slag remain on 1600 ℃ of temperature;
D, carried out fused reduction iron-smelting 30 minutes;
The molten iron of e, smelting output injects desulfurization bucket desulfurizing and refining, makes sulphur content reach pig iron sulfur-bearing standard;
F, ingot casting obtain qualified cast iron product.
Embodiment 3
The electric furnace slag of a, molten state directly joins in the fusion reducing furnace;
B, add according to impurity component in the raw material and to account for the calcium oxide of raw material weight 30% and 10% borax yellow soda ash;
C, spray into coal dust, make electric furnace slag remain on 1400 ℃ of temperature;
D, carried out fused reduction iron-smelting 180 minutes;
The molten iron of e, smelting output injects desulfurization bucket desulfurizing and refining, makes sulphur content reach pig iron sulfur-bearing standard;
F, ingot casting obtain qualified cast iron product.
Embodiment 4
The electric furnace slag of a, molten state directly joins in the fusion reducing furnace;
B, add according to impurity component in the raw material and to account for the calcium oxide of raw material weight 20% and 10% silicon-dioxide;
C, spray into coal dust, make electric furnace slag remain on 1400 ℃ of temperature;
D, carried out fused reduction iron-smelting 180 minutes;
The molten iron of e, smelting output injects desulfurization bucket desulfurizing and refining, makes sulphur content reach pig iron sulfur-bearing standard;
F, ingot casting obtain qualified cast iron product.
Claims (2)
1, a kind of technology of recovering iron by smelting reduction of electric furnace slag is characterized in that, comprises following order and step:
The electric furnace slag of a, molten state directly joins in the fusion reducing furnace;
B, press raw material weight per-cent according to impurity component in the raw material and add 20～50% slag formers;
C, spray into coal dust and make electric furnace slag remain on 1400 ℃～1600 ℃ temperature;
D, carried out fused reduction iron-smelting 30～180 minutes;
The molten iron of e, smelting output injects desulfurization bucket desulfurizing and refining, makes sulphur content reach pig iron sulfur-bearing standard;
F, ingot casting obtain qualified cast iron product.
According to the technology of the described recovering iron by smelting reduction of electric furnace slag of claim 1, it is characterized in that 2, the slag former described in the step b is calcium oxide, silicon-dioxide, fluorite, borax yellow soda ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910067564A CN101665847A (en) | 2009-09-22 | 2009-09-22 | Process for recovering iron by smelting reduction of electric furnace slag |
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| CN200910067564A CN101665847A (en) | 2009-09-22 | 2009-09-22 | Process for recovering iron by smelting reduction of electric furnace slag |
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| CN101665847A true CN101665847A (en) | 2010-03-10 |
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| CN200910067564A Pending CN101665847A (en) | 2009-09-22 | 2009-09-22 | Process for recovering iron by smelting reduction of electric furnace slag |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094099A (en) * | 2011-01-17 | 2011-06-15 | 中国恩菲工程技术有限公司 | Ferronickel refining system |
| CN102534071A (en) * | 2012-03-22 | 2012-07-04 | 韶关市腾兴实业有限公司 | Device for producing metal component by electric furnace steel-making slag and process thereof |
-
2009
- 2009-09-22 CN CN200910067564A patent/CN101665847A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094099A (en) * | 2011-01-17 | 2011-06-15 | 中国恩菲工程技术有限公司 | Ferronickel refining system |
| CN102094099B (en) * | 2011-01-17 | 2013-07-17 | 中国恩菲工程技术有限公司 | Ferronickel refining system |
| CN102534071A (en) * | 2012-03-22 | 2012-07-04 | 韶关市腾兴实业有限公司 | Device for producing metal component by electric furnace steel-making slag and process thereof |
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Open date: 20100310 |