CN110643830B - Method for producing zinc oxide and ferrosilicon alloy by using copper slag - Google Patents
Method for producing zinc oxide and ferrosilicon alloy by using copper slag Download PDFInfo
- Publication number
- CN110643830B CN110643830B CN201910987438.6A CN201910987438A CN110643830B CN 110643830 B CN110643830 B CN 110643830B CN 201910987438 A CN201910987438 A CN 201910987438A CN 110643830 B CN110643830 B CN 110643830B
- Authority
- CN
- China
- Prior art keywords
- copper slag
- percent
- smelting
- slag
- pellets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/34—Obtaining zinc oxide
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
-
- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- 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
- C22B7/001—Dry processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
Abstract
The invention discloses a method for producing zinc oxide and ferrosilicon alloy by using copper slag, which comprises the following steps: 1) preparing copper slag carbon-containing pellets by batching and mixing copper slag, a reducing agent and a binder and then preparing the copper slag carbon-containing pellets by a pellet pressing or disc pelletizing process, and drying the copper slag carbon-containing pellets for later use; 2) directly feeding the carbon-containing pellets of the copper slag into a reduction furnace for reduction to form metallized pellets; 3) the metallized pellets produced by the reducing furnace are subjected to water quenching, cooling, grinding and magnetic separation to obtain silicon-containing iron powder and tailings; 4) mixing and briquetting ferrosilicon powder, silica particles and a reducing agent, and then directly sending the mixture into an ore-smelting electric furnace for smelting to obtain ferrosilicon alloy and furnace slag. The invention adopts an innovative process combining direct reduction and submerged arc furnace smelting, zinc element is recycled in the direct reduction furnace to obtain zinc oxide powder with high added value, and the silicon-containing iron powder with metallization rate more than 97 percent is obtained through ore grinding and magnetic separation, thereby greatly saving power consumption and raw material cost.
Description
Technical Field
The invention relates to a treatment process of copper smelting slag, in particular to a method for producing zinc oxide and ferrosilicon alloy by using copper slag.
Background
The copper slag isSlag generated in the copper smelting process belongs to non-ferrous metal slag. The waste slag discharged by adopting the reverberatory furnace method for copper smelting is reverberatory furnace copper slag, and the waste slag discharged by adopting the blast furnace copper smelting is blast furnace copper slag. China is the main world copper producing country, about 2.2 tons of smelting slag are produced when 1 ton of copper is produced by 90 percent of pyrometallurgical process, in recent years, the amount of copper slag produced in China is about 1600 million tons every year, and the historical stock exceeds 1.2 hundred million tons. The chemical composition of the copper slag is SiO2：30％～40％，CaO：5％～10％，MgO：1％～5％，Al2O3: 2% -4%, Fe: 27% -40%, Zn: 1% -3%; the main phase is fayalite, and the secondary phases are magnetite, vitreous body and sulfide. At present, most copper smelting enterprises sell part of copper slag to building material enterprises for cement additives and brickmaking, and part of copper slag is stockpiled, so that valuable metals in the smelting slag are not recovered to the maximum extent. Under the conditions that the profit of the copper smelting industry is reduced and the environmental protection requirement is increasingly strict, the copper slag is reasonably comprehensively treated and the economic benefit is realized, which is of great importance to copper smelting enterprises.
The ferrosilicon is iron-silicon alloy prepared by smelting coke (or semi coke), steel scrap (or pellet ore) and quartz (or silica) serving as raw materials in an electric furnace, wherein the granularity of the silica is 80-140 mm, the granularity of the coke is 8-18 mm, and the granularity of the pellet ore is 8-18 mm. Ferrosilicon is commonly used as a deoxidizer in steel making, can also be used as an alloy element additive, is widely applied to low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, and is commonly used as a reducing agent in ferroalloy production and chemical industry.
For example, patent publication No. CN105886765A discloses a method for preparing ferrosilicon, which comprises: mixing the copper slag, the silica and the medium-low-rank coal to obtain a mixed material; smelting the mixed material to obtain a mixed solution of silicon-containing molten iron and ferrosilicon slag; and carrying out slag-iron separation treatment on the mixed solution of the silicon-containing molten iron and the ferrosilicon slag so as to obtain a ferrosilicon alloy product. The method utilizes the characteristic that the main components of the copper slag are iron oxide and silicon dioxide, and utilizes the copper slag to replace scrap iron and partially replace silica to smelt ferrosilicon, thereby reducing the production cost of the ferrosilicon.
In the invention, the mixture obtained by mixing the copper slag, the silica and the medium-low rank coal is directly smelted to obtain the molten silicon iron, and the iron phase in the copper slag is fayalite (Fe)2SiO4) In the process of producing ferrosilicon, carbon in the coal is first reduced to fayalite (Fe)2SiO4) Then only then can SiO be reduced2The reaction time with the medium-low-rank coal is prolonged, so the power consumption of the submerged arc furnace is increased, the temperature of the smelting treatment is 1700-2000 ℃, the time is 0.5-2 hours, and in addition, 2-3% of zinc element in the copper slag is not recovered, so that the white zinc element is wasted.
For example, patent publication No. CN107760977A discloses a method for preparing a ferrosilicon product: 1) copper slag, nickel slag, steel scraps, silica and a carbonaceous reducing agent are mixed according to the mass ratio of 50: 50: 20: 120: 70-100 times of mixing; the mass fraction of total iron in the nickel slag and the copper slag is more than 35 percent, and the mass fraction of silicon dioxide in the silica is not less than 95 percent; the fixed carbon content in the carbonaceous reducing agent is not less than 75 percent, and the ash content is higher than 15 percent; so as to obtain a mixed material; 2) smelting the mixed material at 1650-2100 ℃ for 1.5-2 hours to obtain a mixed solution of silicon-containing molten iron and ferrosilicon slag; and carrying out slag-iron separation treatment on the mixed solution of the silicon-containing molten iron and the ferrosilicon slag so as to obtain a ferrosilicon alloy product. The invention can effectively realize the waste utilization of the nickel slag, the steel scraps and the copper slag, avoid the pollution of the nickel slag, the steel scraps and the copper slag to the environment and improve the economic benefit.
The above-mentioned drawbacks of the invention are similar to those of the invention patent publication No. CN105886765A in that the iron phase in the copper slag and the nickel slag is fayalite (Fe)2SiO4) In the process of producing ferrosilicon, carbon in the coal is first reduced to fayalite (Fe)2SiO4) Then only then can SiO be reduced2The reaction time is prolonged, so that the power consumption of the submerged arc furnace is increased, the corresponding energy consumption is also increased, the temperature of the smelting treatment is 1650-2100 ℃, the time is 1.5-2 hours, in addition, 2-3 percent of zinc element in copper slag is not recovered, and the zinc element is causedPlain white is wasted.
The traditional technology for producing the ferrosilicon is to add silica, coke and pellet ore into an ore-smelting electric furnace for smelting, wherein the granularity of the three raw materials is larger, the granularity of the silica is 80-140 mm, the granularity of the coke is 8-18 mm, the granularity of the pellet ore is 8-18 mm, the smelting temperature is 1700-2000 ℃, the smelting time is 1.5-2 hours, and the power consumption per ton of ferrosilicon smelting is 8500 KWh-9000 KWh.
In the prior art, the copper slag is mostly used as an additive of partial cement, and the elements of silicon, iron and zinc in the copper slag are not reasonably utilized; the technology of directly smelting ferrosilicon in an ore thermoelectric furnace by mixing copper slag, silica and medium-low rank coal is also available, 2-3% of zinc element in the copper slag is not recovered, the smelting temperature is 1700-2000 ℃, the smelting time is 0.5-2 hours, the power consumption of the ferrosilicon smelting per ton is 8500 Kwh-9000 Kwh, and the energy consumption is high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for producing zinc oxide and ferrosilicon alloy by using copper slag, an innovative process combining direct reduction and submerged arc furnace smelting is adopted, zinc element is recycled in a direct reduction furnace to obtain zinc oxide powder with high added value, and ferrosilicon powder with metallization rate of more than 97 percent is obtained by ore grinding and magnetic separation, so that pellet and part of silica in the traditional process are replaced, and the power consumption and the raw material cost are greatly saved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for producing zinc oxide and ferrosilicon alloy by using copper slag comprises the following steps:
1) preparing carbon-containing pellets of copper slag: preparing copper slag carbon-containing pellets by batching and mixing copper slag, a reducing agent and a binder and then preparing the copper slag carbon-containing pellets by a pellet pressing or disc pelletizing process, and drying the copper slag carbon-containing pellets for later use;
2) reducing and recovering zinc oxide powder by using a reducing furnace: directly feeding the carbon-containing pellets of the copper slag obtained in the step 1) into a reduction furnace for reduction, reducing iron oxide in the copper slag into metallic iron to form metallized pellets, reducing zinc oxide in the copper slag into elemental zinc, feeding the elemental zinc into flue gas, and collecting the elemental zinc by a dust collection system;
3) cooling, grinding and magnetic separation to obtain silicon-containing iron powder: the metallized pellets produced by the reducing furnace are subjected to water quenching, cooling, grinding and magnetic separation to obtain silicon-containing iron powder and tailings;
4) smelting ferrosilicon: mixing and briquetting the silicon-containing iron powder obtained in the step 3), silica particles and a reducing agent, and then directly feeding the mixture into an ore-smelting electric furnace for smelting to obtain the ferrosilicon alloy and slag.
In the step 1), the copper slag is tailings obtained by recovering copper from slag discharged by pyrometallurgical copper smelting through slow cooling and fine grinding flotation, and contains TFe: 30-50%, Zn: 1% -3% of SiO2: 30-50% and the granularity-325 meshes is more than 80%.
In the step 1), the reducing agent is one or a mixture of more of anthracite, semi-coke and coke, and the fixed carbon content is more than 75%.
In the step 1), the mass ratio of the copper slag to the reducing agent is 100: (20-30).
In the step 1), the moisture of the carbon-containing pellets of the copper slag is less than 2% after the carbon-containing pellets are dried.
In the step 2), the reduction temperature in the reduction furnace is 1150-1330 ℃, the reduction time is 25-40 min, and the zinc content of the obtained zinc oxide powder is more than 60%.
In the step 3), the grinding fineness of-325 meshes of the metallized pellets produced by the reduction furnace is more than 75%, and the magnetic field intensity is 1800 Authent-2200 Authent.
In the step 3), the obtained silicon-containing iron powder accounts for 75% of the weight of 200 meshes, the metallization rate is more than 97%, and the chemical components are TFe: 75 to 80 percent of SiO2: 15 to 22 percent, less than 1 percent of C, less than 0.03 percent of S, less than 0.02 percent of P, CaO + MgO + Al2O3≤1％。
In the step 4), the silica particles contain SiO2More than 97 percent, and the particle size composition is as follows:
15 percent of 3 mm-2 mm;
35 percent of 2 mm-1 mm;
20 percent of 1 mm-0.5 mm;
less than 0.5mm accounts for 30%.
In the step 4), the reducing agent is coking coal, the granularity of the coking coal is-3 mm and accounts for 100%, and the caking index is more than 90.
In the step 4), the mass ratio of the silicon-containing iron powder, the silica particles and the reducing agent is 100: 610: 400.
in the step 4), the compression strength of the pressing blocks is more than or equal to 600N/block.
In the step 4), the smelting temperature is 1500-1680 ℃, and the smelting time is 30-45 min.
The method for producing the zinc oxide and the ferrosilicon alloy by using the copper slag provided by the invention also has the following beneficial effects:
1) the method of the invention utilizes the characteristic of high iron and silicon contents in the copper slag to produce ferrosilicon, and simultaneously extracts the zinc element of the copper slag to be recovered in the form of zinc oxide powder, thereby realizing the comprehensive utilization of the copper slag resources;
2) the method adopts the ferrosilicon-containing powder reduced by the copper slag to replace the pellet for smelting, has obvious advantages, saves the energy consumption of generating metallic iron by the reaction of iron oxide in the pellet, ensures that the iron metallization rate in the ferrosilicon-containing powder in the submerged arc furnace is more than 97 percent, can react with silica only by heating and melting, and greatly saves the energy consumption;
3) the silicon-containing iron powder obtained by the reduction and magnetic separation of the copper slag contains 15 to 22 percent of SiO2Can replace part of silica for smelting, further reducing the cost of raw materials;
4) according to the method, the coking coal with high caking index and low price is used for replacing expensive coke to carry out ferrosilicon smelting, so that coking production of the traditional process is omitted, and in the process that the pellets gradually descend in the ore-smelting electric furnace, coking reaction is carried out on the coking coal in the ore-smelting electric furnace along with the rise of the temperature in the ore-smelting electric furnace, and a large amount of binding phases are generated, so that carbon elements for the ferrosilicon reaction are provided, meanwhile, the strength of the pellets is rapidly increased to more than 2500N from 600N/when the pellets are added into the ore-smelting electric furnace, the air permeability in the furnace is ensured, and the smooth operation of the ore-smelting electric furnace is ensured;
5) compared with the traditional process, the method has the advantages that the granularity of the raw materials is fine, and the power consumption of smelting is greatly reduced. In the traditional process, the granularity of silica is 80-140 mm, the granularity of coke is 8-18 mm, the granularity of pellet is 8-18 mm, and the three raw materials are not tightly combined; the silicon-containing iron powder selected by the invention accounts for 75 percent of the particle size of-200 meshes, the silica particles account for 15 to 2mm, 35 to 1mm, 20 to 0.5mm and 30 percent below 0.5mm, the reducing agent is coking coal with the particle size of-3 mm accounting for 100 percent, and the three fine-grained raw materials are uniformly mixed and pressed into pellets, and the reaction temperature is reduced and the power consumption is correspondingly reduced because the contact specific surface area is increased and the reaction speed is accelerated, so the ferrosilicon smelting temperature is 1500 to 1680 ℃, the smelting time is only 30 to 45min, and the power consumption per ton of ferrosilicon is 6500 to 7000 Kwh.
Drawings
FIG. 1 is a process flow diagram of the process of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 1, the method for producing zinc oxide and ferrosilicon alloy from copper slag provided by the present invention includes the following steps:
1) preparing carbon-containing pellets of copper slag: preparing copper slag carbon-containing pellets by batching and mixing copper slag, a reducing agent and a binder and then preparing the copper slag carbon-containing pellets by a pellet pressing or disc pelletizing process, and drying the copper slag carbon-containing pellets for later use;
2) reducing and recovering zinc oxide powder by using a reducing furnace: directly feeding the carbon-containing pellets of the copper slag obtained in the step 1) into a reduction furnace for reduction to form metallized pellets, wherein the reduction furnace can be a rotary hearth furnace, a rotary kiln, a tunnel kiln, a vehicle bottom furnace and the like, most of iron oxides in the copper slag are reduced into metallic iron in the reduction furnace to form the metallized pellets, zinc oxide in the copper slag is reduced into elemental zinc and enters flue gas, and the elemental zinc is collected through a dust collection system;
3) cooling, grinding and magnetic separation to obtain silicon-containing iron powder: the metallized pellets produced by the reducing furnace are subjected to water quenching, cooling, grinding and magnetic separation to obtain silicon-containing iron powder and tailings, and the tailings are used in the building material industry;
4) smelting ferrosilicon: mixing and briquetting the silicon-containing iron powder obtained in the step 3), silica particles and a reducing agent, and then directly feeding the mixture into an ore-smelting electric furnace for smelting to obtain the ferrosilicon alloy and slag.
Preferably, in the step 1), the copper slag is tailings obtained by recovering copper from slag discharged by pyrometallurgical copper smelting through slow cooling and fine grinding flotation, and the tailings contain TFe: 30-50%, Zn: 1% -3% of SiO2: 30-50 percent of copper slag, the proportion of the granularity of 325 meshes is more than 80 percent, the reducing agent is one or a mixture of more of anthracite, semi coke and coke, the fixed carbon content is more than 75 percent, and the mass ratio of the copper slag to the reducing agent is 100: (20-30), and drying the carbon-containing pellets of the copper slag to obtain the pellets with the water content of less than 2%.
Preferably, in the step 2), the reduction temperature in the reduction furnace is 1150-1330 ℃, the reduction time is 25-40 min, and the zinc content of the obtained zinc oxide powder is more than 60%.
Preferably, in the step 3), the grinding fineness of the metallized pellets produced by the reduction furnace is more than 75 percent in a ratio of minus 325 meshes, and the magnetic field intensity is 1800 Ott to 2200 Ott. The obtained silicon-containing iron powder accounts for 75 percent in a 200-mesh mode, the metallization rate is more than 97 percent, and the chemical components are TFe: 75 to 80 percent of SiO2: 15 to 22 percent, less than 1 percent of C, less than 0.03 percent of S, less than 0.02 percent of P, CaO + MgO + Al2O3≤1％。
Preferably, in the step 4), the silica particles contain SiO2More than 97 percent, and the particle size composition is as follows:
15 percent of 3 mm-2 mm;
35 percent of 2 mm-1 mm;
20 percent of 1 mm-0.5 mm;
less than 0.5mm accounts for 30%.
The reducing agent is coking coal, the granularity of the coking coal is-3 mm and accounts for 100 percent, the caking index is more than 90, the mass ratio of the ferrosilicon powder, the silica particles and the reducing agent is 100: 610: 400, the compression strength of the briquettes is more than or equal to 600N/briquette, the smelting temperature is 1500-1680 ℃, the smelting time is 30-45 min, and 6500-7000 Kwh of electricity consumption per ton of ferrosilicon is realized.
Example one
The composition of the tailings after flotation of a certain copper slag is shown in the following table:
| element(s) | TFe | FeO | Cu | CaO | MgO | SiO2 | Al2O3 | Na2O | K2O | S | P | Pb | Zn |
| Content (wt.) | 43.21 | 44.44 | 0.17 | 1.82 | 2.62 | 31.34 | 3.32 | 0.25 | 1.02 | 0.19 | 0.02 | 0.26 | 1.09 |
1) Preparing carbon-containing pellets of copper slag: uniformly mixing the copper slag, anthracite with the fixed carbon content of 80.32 percent and bentonite, pressing into carbon-containing pellets, and drying the carbon-containing pellets in a drying machine until the moisture content is less than 2 percent;
2) reducing and recycling zinc oxide powder in a rotary hearth furnace: conveying the carbon-containing pellets of the copper slag into a rotary hearth furnace for reduction, wherein the temperature in the rotary hearth furnace is 1150-1300 ℃, and the reduction time is 35min to obtain 62.95% of zinc element in zinc oxide powder;
3) cooling, grinding and magnetic separation to obtain silicon-containing iron powder: the metallized pellet produced by the rotary hearth furnace is subjected to water quenching, cooling, grinding and magnetic separation to obtain silicon-containing iron powder and tailings, wherein the metallization rate of the silicon-containing iron powder is 98.63 percent, and the weight ratio of TFe: 76.82% and SiO2：19.65％；
4) Smelting ferrosilicon: mixing and briquetting ferrosilicon powder, silica particles and coking coal, and directly feeding the mixture into an ore-smelting electric furnace for smelting to obtain ferrosilicon alloy and slag with the trade name of FeSi75Al10.5-A, wherein the ferrosilicon powder has the granularity of-200 meshes which accounts for 82.23%, and the silica has the granularity components as follows: 13-15% of 3-2 mm, 30-35% of 2-1 mm, 15-20% of 1-0.5 mm, 25-30% of less than 0.5mm, 100% of coke coal granularity, 95% of caking index, 705N/compression strength of pressed pellets, 1550 ℃ iron smelting temperature, 35min smelting time and 6800Kwh of power consumption per ton of ferrosilicon.
Example two
The composition of the tailings after flotation of a certain copper slag is shown in the following table:
| element(s) | TFe | FeO | Cu | CaO | MgO | SiO2 | Al2O3 | Pb | Zn | S | P | K2O | Na2O |
| Content (wt.) | 41.55 | 41.82 | 0.19 | 1.85 | 1.81 | 33 | 3.15 | 0.54 | 2.23 | 0.24 | 0.018 | 0.36 | 0.12 |
1) Preparing carbon-containing pellets of copper slag: uniformly mixing the copper slag, semi-coke with fixed carbon content of 76.66% and bentonite, pressing into carbon-containing pellets, and drying the carbon-containing pellets in a drying machine of a grate until the moisture content is less than 2%;
2) reducing and recycling zinc oxide powder in a rotary hearth furnace: conveying the carbon-containing pellets of the copper slag into a rotary hearth furnace for reduction, wherein the temperature in the rotary hearth furnace is 1150-1280 ℃, and the reduction time is 40min, so that the zinc element content of the zinc oxide powder is 63.62%;
3) cooling, grinding and magnetic separation to obtain silicon-containing iron powder: the metallized pellet produced by the rotary hearth furnace is subjected to water quenching, cooling, grinding and magnetic separation to obtain silicon-containing iron powder and tailings, wherein the metallization rate of the silicon-containing iron powder is 97.88 percent, and the percentage by weight of TFe: 80.82% and SiO2：16.65％；
4) Smelting ferrosilicon: mixing and briquetting ferrosilicon powder, silica particles and coking coal, and directly feeding the mixture into an ore-smelting electric furnace for smelting to obtain ferrosilicon alloy with the grade of FeSi90Al3 and slag. Wherein the silicon-containing iron powder has a particle size of-200 meshes of 82.23%, and the silica has the following particle size: 13-15% of 3-2 mm, 30-35% of 2-1 mm, 15-20% of 1-0.5 mm, 25-30% of less than 0.5mm, 100% of coking coal granularity, 100% of caking index, 802N/compression strength of pressed pellets, 1600 ℃ of iron smelting temperature, 30min of smelting time and 6850Kwh of power consumption per ton of ferrosilicon.
In conclusion, the method for producing zinc oxide and ferrosilicon alloy by using copper slag provided by the invention aims at the problem of low utilization rate due to long-term stockpiling of copper slag, adopts the process flows of direct reduction, ore grinding and magnetic separation, iron powder briquetting and ferrosilicon smelting, produces zinc oxide powder and ferrosilicon alloy with high additional values, reduces the ferrosilicon smelting temperature, shortens the ferrosilicon reaction time, thereby reducing the ferrosilicon smelting power consumption, realizing the comprehensive utilization of copper slag resources and improving the utilization level of copper slag.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. A method for producing zinc oxide and ferrosilicon alloy by using copper slag is characterized by comprising the following steps:
1) preparing carbon-containing pellets of copper slag: preparing copper slag carbon-containing pellets by batching and mixing copper slag, a reducing agent and a binder and then preparing the copper slag carbon-containing pellets by a pellet pressing or disc pelletizing process, and drying the copper slag carbon-containing pellets for later use;
2) reducing and recovering zinc oxide powder by using a reducing furnace: directly feeding the carbon-containing pellets of the copper slag obtained in the step 1) into a reduction furnace for reduction, reducing iron oxide in the copper slag into metallic iron to form metallized pellets, reducing zinc oxide in the copper slag into elemental zinc, feeding the elemental zinc into flue gas, and collecting the elemental zinc by a dust collection system;
3) cooling, grinding and magnetic separation to obtain silicon-containing iron powder: the metallized pellets produced by the reducing furnace are subjected to water quenching, cooling, grinding and magnetic separation to obtain silicon-containing iron powder and tailings;
4) smelting ferrosilicon: mixing and briquetting the silicon-containing iron powder obtained in the step 3), silica particles and a reducing agent, directly feeding the mixture into an ore smelting electric furnace for smelting to obtain ferrosilicon alloy and slag,
in the step 3), the silicon-containing iron powder with the particle size of-200 meshes accounts for 75%, the metallization rate is greater than 97%, and the chemical components are TFe: 75 to 80 percent of SiO2: 15 to 22 percent, less than 1 percent of C, less than 0.03 percent of S, less than 0.02 percent of P, CaO + MgO + Al2O3≤1％；
In the step 3), the grinding fineness of-325 meshes of the metallized pellets produced by the reduction furnace is more than 75 percent, the magnetic field intensity is 1800 oersted-2200 oersted,
said step (c) is4) In the silica particles, the silica particles contain SiO2More than 97 percent, and the particle size composition is as follows:
15 percent of 3 mm-2 mm;
35 percent of 2 mm-1 mm;
20 percent of 1 mm-0.5 mm;
30 percent of the total weight of the powder with the thickness of less than 0.5mm,
the reducing agent is coking coal with a granularity of-3 mm accounting for 100 percent and a caking index of more than 90,
the mass ratio of the silicon-containing iron powder to the silica particles to the reducing agent is 100: 610: 400,
the compression strength of the pressed pellets is more than or equal to 600N/pellet,
the smelting temperature is 1500-1680 ℃, and the smelting time is 30-45 min.
2. The method for producing zinc oxide and ferrosilicon alloy using copper slag as claimed in claim 1, wherein: in the step 1), the copper slag is tailings obtained by recovering copper from slag discharged by pyrometallurgical copper smelting through slow cooling and fine grinding flotation, and contains TFe: 30-50%, Zn: 1% -3% of SiO2: 30-50% and the granularity-325 meshes is more than 80%.
3. The method for producing zinc oxide and ferrosilicon alloy using copper slag as claimed in claim 2, wherein: in the step 1), the reducing agent is one or a mixture of more of anthracite, semi-coke and coke, and the fixed carbon content is more than 75%.
4. The method for producing zinc oxide and ferrosilicon alloy using copper slag as claimed in claim 3, wherein: in the step 1), the mass ratio of the copper slag to the reducing agent is 100: (20-30).
5. The method for producing zinc oxide and ferrosilicon alloy using copper slag as claimed in claim 4, wherein: in the step 1), the moisture of the carbon-containing pellets of the copper slag is less than 2% after the carbon-containing pellets are dried.
6. The method for producing zinc oxide and ferrosilicon alloy using copper slag as claimed in claim 1, wherein: in the step 2), the reduction temperature in the reduction furnace is 1150-1330 ℃, the reduction time is 25-40 min, and the zinc content of the obtained zinc oxide powder is more than 60%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910987438.6A CN110643830B (en) | 2019-10-17 | 2019-10-17 | Method for producing zinc oxide and ferrosilicon alloy by using copper slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910987438.6A CN110643830B (en) | 2019-10-17 | 2019-10-17 | Method for producing zinc oxide and ferrosilicon alloy by using copper slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110643830A CN110643830A (en) | 2020-01-03 |
| CN110643830B true CN110643830B (en) | 2022-02-01 |
Family
ID=69013010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910987438.6A Active CN110643830B (en) | 2019-10-17 | 2019-10-17 | Method for producing zinc oxide and ferrosilicon alloy by using copper slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110643830B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850304B (en) * | 2020-07-27 | 2022-07-05 | 中冶东方工程技术有限公司 | Copper slag treatment system and method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6514414B1 (en) * | 2000-09-08 | 2003-02-04 | Clariant Finance (Bvi) Limited | Process for separation and removal of iron ions from basic zinc solution |
| CN104404260A (en) * | 2014-11-24 | 2015-03-11 | 北京神雾环境能源科技集团股份有限公司 | Method for separating valuable metals from copper slag |
| CN105886765A (en) * | 2016-04-26 | 2016-08-24 | 江苏省冶金设计院有限公司 | Method for producing ferrosilicon |
| CN106676263B (en) * | 2016-12-13 | 2018-07-10 | 江苏省冶金设计院有限公司 | A kind of copper tailings and the method and system of converter rough dedusting ash comprehensive utilization |
| CN107674972A (en) * | 2017-09-30 | 2018-02-09 | 江苏省冶金设计院有限公司 | Utilize the method for copper ashes production sponge iron |
| CN108103306A (en) * | 2017-12-28 | 2018-06-01 | 江苏省冶金设计院有限公司 | The system and method for handling copper ashes |
-
2019
- 2019-10-17 CN CN201910987438.6A patent/CN110643830B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110643830A (en) | 2020-01-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102643997B (en) | Laterite-nickel ore processing method for efficiently recovering nickel resources | |
| CN103468961B (en) | A kind of airtight cupola furnace process Steel Plant are containing zinc, lead powder dirt processing method | |
| CN100507013C (en) | Method for directly producing ferrochromium from chrome ore powder and coal | |
| WO2019071792A1 (en) | Production method based on smelting reduction of slag containing zinc and iron | |
| CN104404260A (en) | Method for separating valuable metals from copper slag | |
| WO2019071796A1 (en) | Method for recovering valuable components from mixed slag containing nickel and iron | |
| CN110669945B (en) | Method for treating copper slag by using direct reduction of rotary hearth furnace and smelting reduction of ore-smelting electric furnace | |
| CN102094095B (en) | Method for quickly separating and directly reducing iron slag | |
| CN101967571B (en) | Method for using red-soil nickel ore to produce nickel-iron alloy in tunnel kiln-electric furnace | |
| WO2019071797A1 (en) | Method for producing mixed slag containing nickel and iron | |
| CN110669980B (en) | Preparation method of stainless steel 3D printing powder and product thereof | |
| CN101643806B (en) | Method for producing molten iron with high-phosphorus and low-iron refractory iron ore | |
| WO2019071787A1 (en) | Method for recovering valuable components from smelting slag containing nickel | |
| CN101967570A (en) | Method for producing ferro-nickel alloy from red soil nickel ore | |
| CN111647753B (en) | Method for recovering zinc by direct reduction of melting gasification furnace | |
| CN106636655A (en) | Treatment method of electric furnace dust | |
| CN102344981A (en) | Separation and direct reduction process of iron and boron in boron-containing iron ore concentrate | |
| CN111394647A (en) | Vanadium-containing pig iron and method for preparing vanadium-containing pig iron by smelting vanadium-containing steel slag | |
| CN102653822B (en) | Iron-containing solid byproduct of iron making by smelting reduction and manufacturing method thereof | |
| CN110643830B (en) | Method for producing zinc oxide and ferrosilicon alloy by using copper slag | |
| CN103695634B (en) | A kind of low-grade laterite nickel ore semi-molten state produces the method for Rhometal | |
| CN102046817A (en) | Method for manufacturing pig iron | |
| CN112080644B (en) | Method for cooperatively treating zinc-containing dust and polycrystalline silicon cutting waste material in main channel of blast furnace | |
| CN108796236A (en) | A kind of method of valuable constituent element comprehensive reutilization in copper ashes | |
| CN101376927B (en) | Heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |