CN111455193A - Magnetic iron reduction method for electric dilution furnace - Google Patents
Magnetic iron reduction method for electric dilution furnace Download PDFInfo
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- CN111455193A CN111455193A CN202010281050.7A CN202010281050A CN111455193A CN 111455193 A CN111455193 A CN 111455193A CN 202010281050 A CN202010281050 A CN 202010281050A CN 111455193 A CN111455193 A CN 111455193A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0002—Preliminary treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
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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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Abstract
The invention discloses a magnetic iron reduction method for a depletion electric furnace. The method comprises the following steps: detecting the distribution position of magnetic iron in the dilution electric furnace before reduction by using a reducing agent, analyzing the magnetic iron content of the position by using a magnetic iron analyzer, determining that the reduction is carried out by using the reducing agent at the position with the magnetic iron content higher than 8.5% obtained by analysis, and determining that the reduction is not needed at the position with the magnetic iron content lower than or equal to 8.5%. Before the reducing agent is used for reduction, unnecessary reduction can be reduced by adopting the mode, and technical support is provided for reducing production cost, saving resources, reducing consumption of non-renewable resources and constructing green metallurgy.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a magnetic iron reduction method for a dilution furnace.
Background
Copper slag is one of the slag with large quantity in the waste slag of non-ferrous metal smelting, the stacking of the slag not only occupies a large amount of land and brings difficulty to production and management, but also causes certain pollution to water resources because heavy metal contained in the slag permeates into the earth surface and underground water by the washing of rainwater. Therefore, the effective method for treating the copper slag is researched, valuable components in the slag are extracted, not only can the reutilization of waste resources be realized, the reduction and the harmlessness of industrial wastes be realized, but also certain economic benefit can be obtained.
The copper slag contains a large amount of iron, copper and noble metals and rare metals associated with the copper, wherein the iron is mainly distributed in an olivine phase and a magnetic iron oxide phase, and the copper is mainly dispersed in the slag as fine particles. At present, in copper smelting, the method for reducing magnetic iron mainly adopts coke, reducing coal and 0#The reducing mechanism of the magnetic iron is that carbon or hydrogen in the reducing agent reacts with the magnetic iron to generate ferrous oxide, carbon dioxide and water, and the ferrous oxide reacts with free silicon dioxide in a slag layer to generate fayalite slag which is easy to separate from matte, so that the purpose of reducing the magnetic iron is achieved. The adoption of the reducing agent has the following defects that coke and reduced coal float on the surface and are not fully contacted with a slag layer when reacting with magnetic iron due to small density and large particles, are non-renewable resources, and have utilization rateThe problem of low; 0#After the diesel oil is atomized, the problems of contact with a slag layer and utilization rate are solved, but the problems of high price and non-reproducibility exist; although the utilization rate of natural gas is high, the problems of high temperature, electrification, corrosion, limited space and non-regeneration exist due to the position using the reducing agent.
Accordingly, the prior art remains to be improved and developed.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a method for reducing magnetic iron for use in a dilution electric furnace, which aims to solve the problems that the conventional reducing agent is a non-renewable resource, the reducing agent is not fully utilized, and the cost is high.
The technical scheme of the invention is as follows:
a magnetic iron reduction method for a lean electric furnace, wherein before reduction using a reducing agent, the magnetic iron distribution position in the lean electric furnace is detected, the magnetic iron content of the position is analyzed by a magnetic iron analyzer, reduction using the reducing agent is determined at the position where the magnetic iron content is higher than 8.5% and reduction is not needed at the position where the magnetic iron content is lower than or equal to 8.5%.
Further, the step of reducing with a reducing agent comprises: the reducing agent is conveyed to a pipeline controlled by an automatic regulating valve, the pipeline is connected with an oil gun, the oil gun is inserted into the upper part of a slag layer in the furnace from the top of a body of the impoverishment furnace, the reducing agent is preheated to be burnt at a nozzle of a gun head, the oil gun is inserted into the slag layer, and the reducing agent is blown into the slag layer to reduce the magnetic iron.
Furthermore, the reducing agent is waste mineral oil, the additive is nitrogen, the concentration of the nitrogen is more than 95%, and the water content of the nitrogen and the water content of the waste mineral oil are both less than 1%.
Furthermore, the dosage of the reducing agent at the single-point position is 70-100L/h.
Further, the using time of the single-point position reducing agent is 10-30 min.
Further, the thickness of the slag layer is controlled to be 600-900mm when the reducing agent is used for reduction.
Furthermore, the oil gun is inserted into the position 100mm above the slag layer in the furnace from the top of the body of the electric dilution furnace and is not contacted with the slag layer.
Furthermore, the oil gun is inserted into the slag layer, so that the distance between the gun mouth and the highest point of the magnetic iron in the slag layer is 50-100 mm.
Furthermore, the oil pressure of the total oil inlet pipeline is controlled to be 0.25-2.5 MPa.
Further, the nitrogen pressure is controlled to be 0.25-0.5 MPa.
Furthermore, the oil gun is inserted into the slag layer, and the insertion depth is controlled to be 200-600 mm.
Further, after blowing the reducing agent with an oil gun, the mixture was left to stand for 40min, and then slag discharge was started.
Has the advantages that: the invention provides a novel reducing agent waste mineral oil, wherein the reducing agent is a secondary resource and a relatively non-renewable resource, and has the environmental benefit of reducing various pollutions. Meanwhile, the invention also optimizes the reduction mode to obtain a novel reduction method which is practical for the dilution electric furnace, and provides technical support for reducing the production cost, saving resources, reducing the consumption of non-renewable resources and constructing green metallurgy.
Drawings
FIG. 1 is a process flow diagram of a magnetic iron reduction process for a depletizer furnace according to the invention.
Detailed Description
The present invention provides a magnetic iron reduction method for a dilution furnace, and the present invention will be described in further detail below in order to make the objects, technical solutions, and effects of the present invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a magnetic iron reduction method for a depletion furnace, wherein before reduction is carried out by using a reducing agent, the distribution position of magnetic iron in the depletion furnace is detected, a magnetic iron analyzer is used for analyzing the magnetic iron content of the position, the reducing agent is determined to be used for reduction at the position where the magnetic iron content is higher than 8.5% obtained by analysis, and the reducing agent is not required to be used for reduction at the position where the magnetic iron content is lower than or equal to 8.5%.
In this example, before reduction using a reducing agent, the distribution of magnetic iron in the depletion furnace was sampled and analyzed, and the reduction position and the use position of the reducing agent were determined based on the distribution of magnetic iron in the furnace. Specifically, a reducing agent is used for reduction at the position with the magnetic iron content higher than 8.5%, and reduction is not needed at the position with the magnetic iron content lower than or equal to 8.5%, because the reduction efficiency is low and the influence on furnace conditions and copper content in waste slag is small when the magnetic iron content is lower than or equal to 8.5%. Before the reducing agent is used for reduction, unnecessary reduction can be reduced by adopting the mode, and technical support is provided for reducing production cost, saving resources, reducing consumption of non-renewable resources and constructing green metallurgy.
In one embodiment, the step of reducing with a reducing agent comprises: conveying a reducing agent to a pipeline controlled by an automatic regulating valve, wherein the pipeline is connected with an oil gun, the oil gun is inserted into the upper part of a slag layer in a furnace from an oil gun hole at the top of a dilution furnace body, firstly introducing nitrogen into the oil gun, then connecting an oil gun system with an oil circuit circulating system, preheating the reducing agent until the reducing agent is combusted at a gun head nozzle, inserting the oil gun into the slag layer, and blowing the reducing agent into the slag layer to reduce magnetic iron.
This example inserts an oil lance into the slag layer for reduction. And adjusting the position of the oil gun to enable the gun mouth to be 50-100 mm away from the highest point of the magnetic iron in the slag layer, mainly because the oil gun is easily blocked due to high viscosity of the highest position of the magnetic iron in the slag layer.
In one embodiment, the dosage of the reducing agent at the single-point position is 70-100L/h, the dosage of the reducing agent at the single-point position (namely, at any position needing reduction) in the embodiment is determined according to the content of the magnetic iron in the slag layer in the furnace, 70L/h is the dosage of the reducing agent for maintaining the minimum effective reduction of the oil gun, and the dosage of the reducing agent is increased by 5L/h but not more than 100L/h per 2% of the increase of the magnetic iron.
In one embodiment, the single point location reductant use time is 10-30 min. This example determines the time for a single use of the reducing agent based on the magnetic iron content at that location. According to tests and practices, 10-30min is the most effective reduction time, the reduction area is smaller when the reduction area is less than 10min, the reduction efficiency is greatly reduced when the reduction area is more than 30min, meanwhile, long-time stirring can cause damage to the furnace wall, and the reduction time is increased by 5min when the magnetic iron is increased by 2%, but is not more than 30 min.
In one embodiment, the thickness of the slag layer is controlled to be 600-900mm when the reducing agent is used, and the depth of the oil gun inserted into the slag layer is controlled to be 200-600 mm. The magnetic iron mainly exists between slag and matte, the probability of gun blockage is greatly increased if the insertion depth of an oil gun in a slag layer exceeds 600mm, splashing is violent if the insertion depth is less than 200mm, slag is seriously adhered to the top of a furnace wall, and meanwhile, the copper content of slag is increased because a thinner slag layer is stirred by using a nitrogen reduction oil gun.
In one embodiment, when the reducing agent is used and the position is less than or equal to 2m away from the slag hole, the slag discharge is stopped, and the reducing agent is blown in by an oil gun and then is kept stand for 40min, and then the slag discharge is started. The reason is that the molten metal is stirred violently when an oil gun is used, the matte particles are difficult to sink, and the valuable metal recovery rate is reduced because the discharging and standing are not stopped.
In one embodiment, the reducing agent is waste mineral oil and the additive is nitrogen gas, the nitrogen gas being used to atomize the waste mineral oil. To prevent the reduced magnetic iron from being oxidized again, the nitrogen concentration is > 95%. The water content of nitrogen and waste mineral oil is less than 1% to prevent the copper matte from reacting with water to explode. The waste mineral oil contains a large amount of hydrocarbon, the hydrocarbon reacts with the magnetic iron in the slag layer to generate ferrous oxide, carbon dioxide and water, the ferrous oxide and free silicon dioxide in the slag layer perform slag forming reaction to generate fayalite slag which is easy to separate from matte, and the purpose of reducing the magnetic iron is achieved.
In one embodiment, the total inlet line oil pressure is controlled to be between 0.25 and 2.5MPa, within which reductant delivery is normal.
In one embodiment, the nitrogen pressure is controlled to be 0.25-0.5Mpa, 0.25Mpa is the minimum pressure for atomization of the reducing agent, the atomization effect of the reducing agent is greatly reduced when the pressure is less than 0.25Mpa, 0.5Mpa is the effective pressure for maximum effective stirring of the melt by the nitrogen, and the melt is splashed greatly when the pressure is more than 0.5Mpa, so that furnace top nodulation is serious.
In the embodiment, waste mineral oil is used as a reducing agent, main equipment comprises one oil tank, 2 oil pumps (one for one and capable of being started remotely), one DCS control system, one oil gun and one oil way circulating system, a specific working process is shown in a figure 1, a bypass working gate valve is in a closed state, the rest gate valves are in an open state, an oil supply pump is started, waste mineral oil is enabled to normally circulate in the oil way circulating system, the pressure on a total oil inlet pipeline is observed, when the pressure reaches 0.25-2.5MPa, the oil gun is inserted into an oil gun hole, a nitrogen gas pipeline is connected with the oil gun, a nitrogen gas valve is opened, a nitrogen gas pressure gauge is adjusted, the pressure is 0.25-0.5MPa, the oil gun pipeline is connected with the oil gun, an oil gun control valve is opened, the oil quantity is adjusted, the oil quantity is controlled to be 70-100L/h, the reducing agent is preheated to be ignited, the ignited oil gun is placed into a slag layer, parameters are adjusted, and the parameters are adjusted to reach a control range, and then the use position, the use amount, the pressure, the use time and the use amount of the reducing agent and.
The invention is further illustrated by the following specific examples.
Using a drill rod to sample and analyze the distribution condition of magnetic iron in the dilution electric furnace;
and determining whether to use the reducing agent for reduction at the point according to the distribution of the magnetic iron in the furnace, and selecting to use the reducing agent for reduction if the highest magnetic iron at the point is higher than 8.5 percent.
When the reducing agent is blown in by using an oil gun for reduction, the reduction time is increased by 5min every time the magnetic iron is increased by 2 percent by taking 10min as an initial time, but the reduction time is not more than 30 min.
When the reducing agent is blown in by using an oil gun for reduction, the dosage of the reducing agent is increased by 5L/h per 2 percent of the magnetic iron from 70L/h as a starting point, but the dosage of the reducing agent is not more than 100L/h.
The nitrogen pressure is controlled to be 0.25-0.5Mpa, and the splashing size is ensured by adjusting according to the splashing size of the slag layer.
The blowing position of the reducing oil gun is 80mm at the highest point of the magnetic iron to be processed.
The thickness of the slag layer is controlled to be 800 mm.
Respectively selecting waste mineral oil and 0#Diesel oil is used as a reducing agent.
The content of magnetic iron before the reduction of the waste mineral oil is 9.5 percent, and the content of magnetic iron after the reduction reaches 6.33 percent and 0 percent#The magnetic iron before diesel oil reduction is 11.16 percent, the magnetic iron after reduction is 7.60 percent, and the reduction efficiency of the waste mineral oil is 0#The reduction efficiency of the diesel oil is kept flat and reaches 32 percent.
The utilization rate of resources is improved, the oil consumption is reduced from 0.60L/t material in 2018 to 0.53L/t material in 2019 (8-11 months), certain economic and social benefits are achieved, the production cost is reduced, and the cost can be saved by 48.2 ten thousand yuan (0 month-11 months) every year#The price of diesel oil is 6850 yuan/ton, the fuel is 5750 yuan/ton, the density is 0.86L/kg, the annual use is 0#482 tons of diesel oil).
In summary, the invention provides a magnetic iron reduction method for a depletion electric furnace, and provides a novel reducing agent waste mineral oil, wherein the reducing agent is a secondary resource and is relatively a non-renewable resource, and has the environmental benefit of reducing various pollutions. Meanwhile, the invention also optimizes the reduction mode to obtain a novel reduction method which is practical for the dilution electric furnace, and provides technical support for reducing the production cost, saving resources, reducing the consumption of non-renewable resources and constructing green metallurgy.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A magnetic iron reduction method for a dilution furnace is characterized in that before reduction is carried out by using a reducing agent, the distribution position of magnetic iron in the dilution furnace is detected, a magnetic iron analyzer is used for analyzing the magnetic iron content of the position, the position with the magnetic iron content higher than 8.5% obtained by analysis is determined to be reduced by using the reducing agent, and the position with the magnetic iron content lower than or equal to 8.5% is determined to be free from reduction.
2. The magnetic iron reduction process for a depreciation furnace according to claim 1, characterized in that the step of reducing with a reducing agent comprises: the reducing agent is conveyed to a pipeline controlled by an automatic regulating valve, the pipeline is connected with an oil gun, the oil gun is inserted into the upper part of a slag layer in the furnace from the top of a body of the impoverishment furnace, the reducing agent is preheated to be burnt at a nozzle of a gun head, the oil gun is inserted into the slag layer, and the reducing agent is blown into the slag layer to reduce the magnetic iron.
3. The magnetic iron reduction process for electric depletion furnaces according to claim 1 characterized in that the reducing agent is waste mineral oil.
4. The magnetic iron reduction process for a depreciation furnace according to claim 1, characterized in that the single point position reductant dosage is 70-100L/h.
5. The magnetic iron reduction process for a depreciation furnace according to claim 1, characterized in that the single point position reductant use time is 10-30 min.
6. The magnetic iron reduction method for a depletion furnace according to claim 2, characterized in that the thickness of the slag layer during reduction with the reducing agent is controlled at 600-900 mm.
7. The magnetic iron reduction process for a lean electric furnace according to claim 2, characterized in that the oil lance is inserted from the top of the body of the lean electric furnace 100mm above the slag layer in the furnace.
8. The magnetic iron reduction process for a lean electric furnace according to claim 2, characterized in that the oil lance is inserted into the slag layer with an insertion depth controlled in the range of 200mm to 600 mm.
9. The magnetic iron reduction process for a depleted furnace according to claim 2, characterized in that the oil lance is inserted into the slag layer with the lance mouth 50mm to 100mm from the highest point of the magnetic iron in the slag layer.
10. The magnetic iron reduction method for a lean electric furnace according to claim 2, wherein the slag discharge is started after the reducing agent is blown in by using an oil lance and left for 40 min.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI852184A0 (en) * | 1985-05-31 | 1985-05-31 | Outokumpu Oy | KONTINUERLIG REDUKTION AV SMAELT METALLURGISK SLAGG I EN ELEKTRISK UGN. |
| FR2777022A1 (en) * | 1998-04-06 | 1999-10-08 | Billiton Sa Limited | Beneficiation of nickel-containing laterite for ferronickel production |
| CN1730673A (en) * | 2005-08-26 | 2006-02-08 | 云南铜业股份有限公司 | Slag cleaning furnace top-blown immersion technology |
| CN103409575A (en) * | 2013-08-13 | 2013-11-27 | 昆明理工大学 | Reducing agent for slag cleaning furnace top-blown immersion blowing reduction |
| CN203429234U (en) * | 2013-08-13 | 2014-02-12 | 昆明理工大学 | Immersed blowing reduction system of depletion electric furnace |
| CN203855625U (en) * | 2014-05-12 | 2014-10-01 | 昆明理工大学 | Evaluation test device for immersion reduction process of slag cleaning electrical furnace |
| CN106756062A (en) * | 2016-11-25 | 2017-05-31 | 北京科技大学 | A kind of multicomponent gas are blown the method for realizing copper ashes depth dilution step by step |
-
2020
- 2020-04-10 CN CN202010281050.7A patent/CN111455193B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI852184A0 (en) * | 1985-05-31 | 1985-05-31 | Outokumpu Oy | KONTINUERLIG REDUKTION AV SMAELT METALLURGISK SLAGG I EN ELEKTRISK UGN. |
| FR2777022A1 (en) * | 1998-04-06 | 1999-10-08 | Billiton Sa Limited | Beneficiation of nickel-containing laterite for ferronickel production |
| CN1730673A (en) * | 2005-08-26 | 2006-02-08 | 云南铜业股份有限公司 | Slag cleaning furnace top-blown immersion technology |
| CN103409575A (en) * | 2013-08-13 | 2013-11-27 | 昆明理工大学 | Reducing agent for slag cleaning furnace top-blown immersion blowing reduction |
| CN203429234U (en) * | 2013-08-13 | 2014-02-12 | 昆明理工大学 | Immersed blowing reduction system of depletion electric furnace |
| CN203855625U (en) * | 2014-05-12 | 2014-10-01 | 昆明理工大学 | Evaluation test device for immersion reduction process of slag cleaning electrical furnace |
| CN106756062A (en) * | 2016-11-25 | 2017-05-31 | 北京科技大学 | A kind of multicomponent gas are blown the method for realizing copper ashes depth dilution step by step |
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