CN103537480A - Low-carbon comprehensive utilization method of copper slag after smelting reduction - Google Patents
Low-carbon comprehensive utilization method of copper slag after smelting reduction Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 117
- 239000010949 copper Substances 0.000 title claims abstract description 97
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 95
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 239000002893 slag Substances 0.000 title claims abstract description 40
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 20
- 238000003723 Smelting Methods 0.000 title claims abstract description 14
- 230000009467 reduction Effects 0.000 title claims abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 77
- 239000002028 Biomass Substances 0.000 claims abstract description 53
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 52
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- 230000008569 process Effects 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 238000000197 pyrolysis Methods 0.000 claims abstract description 21
- 238000003763 carbonization Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 238000005507 spraying Methods 0.000 claims abstract description 11
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- 235000002918 Fraxinus excelsior Nutrition 0.000 claims description 72
- 239000002956 ash Substances 0.000 claims description 72
- 238000002844 melting Methods 0.000 claims description 37
- 230000008018 melting Effects 0.000 claims description 36
- 239000003638 chemical reducing agent Substances 0.000 claims description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- 230000004907 flux Effects 0.000 claims description 15
- 230000000153 supplemental effect Effects 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 238000006722 reduction reaction Methods 0.000 claims description 12
- 239000006227 byproduct Substances 0.000 claims description 10
- 239000000567 combustion gas Substances 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 238000005243 fluidization Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 239000010459 dolomite Substances 0.000 claims description 4
- 229910000514 dolomite Inorganic materials 0.000 claims description 4
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 abstract description 15
- 238000005516 engineering process Methods 0.000 abstract description 12
- 239000003610 charcoal Substances 0.000 abstract description 4
- 238000011946 reduction process Methods 0.000 abstract description 4
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
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- Y02W30/54—
Abstract
The invention relates to a low-carbon comprehensive utilization method of copper slag after smelting reduction, belonging to the technical field of resources and environment. After a smelting reduction process of copper slag, crude metal raw materials and residues are obtained, and in the smelting reduction process, high-temperature flue gas can be also generated. A residue utilization method comprises the steps of cooling and solidifying the residues by water, mechanically grinding and crushing, adding the crushed residues and biomass powder to a fluidized-state biomass gasifier, and carrying out a gasification reaction under a condition of spraying a gasifying agent, wherein in the gasification reaction process, flammable gases and residues can be generated, and the residues are used as raw materials in constructional engineering. A high-temperature flue gas utilization method comprises the steps of carrying out secondary combustion on the high-temperature flue gas, cooling by waste heat utilization, and then introducing into a biomass pyrolysis and carbonization process as an external heat source, wherein pyrolysis gas, flue gas and biomass charcoal are obtained in the biomass pyrolysis and carbonization process, and the flue gas is discharged after being purified. According to the low-carbon comprehensive utilization method, the technical method of preparing flammable gas and biomass charcoal by pyrolyzing and gasifying biomass by means of waste heat of copper slag and coupling with a smelting reduction process of copper slag is a novel low-carbon metallurgical technology.
Description
Technical field
The present invention relates to low carbonization method of comprehensive utilization after a kind of copper ashes melting and reducing, belong to resource and environment technical field.
Background technology
Resource is the material base that the mankind depend on for existence and development, along with mineral resources are exploited for a long time, causes primary resources poor scarce gradually, and developing secondary resource is the important channel that metallurgical industry realizes sustainable development." mineral resources comprehensive utilization " is listed in the preferential theme of < < National Program for Medium-to Long-term Scientific and Technological Development (2006～2020) > >.At present, China's copper output accounts for the first in the world, and the copper ore resource having developed accounts for the whole nation and always verifies 67.1% of resource reserve, in order to meet, smelts production capacity demand, and mining grade has dropped to 0.13%～0.14%, and resource, environment isostructuralism contradiction are increasingly outstanding.In the copper ashes discharging in non-ferrous metal copper smelting process, contain the valuable metal of high added value, because of copper ashes, take fayalite components and as main particularity, fail to regard as valuable resource always and be able to efficient comprehensive reutilization.
According to related documents, show to produce the melting copper ashes that 1t essence copper approximately produces 2.2t, nearly 5 Nian Lai China copper ashes output are 5,240 ten thousand t approximately altogether, in the copper ashes system of this enormous amount, exist the secondary resource that can recycle in a large number, but copper ashes is stored up processing after mostly taking at present shrend cooling.Water quenching is processed molten copper slag and has not only been consumed a large amount of valuable water resources and the energy of process requirements, and the high-temperature residual heat of slag is converted into the low temperature exhaust heat of flushing cinder water, and a large amount of high-quality waste heat of slag can not reasonably be utilized.Cooling 1t Water Quenching Slag need to consume 10t cooling circulating water.Copper ashes tapping temperature is 1200～1300 ℃, and the heat that molten copper slag contains can reach 1.86GJ/t.Copper ashes approximately 0.13 hundred million t of China's generation in 2012, the heat that copper ashes carries away reaches approximately 2.4 * 10
7gJ, amounts to standard coal approximately 81.9 ten thousand t.In copper ashes, be rich on the other hand valuable metal, the especially iron contents such as Cu, Co, Ni, Fe and can reach the more than 35% of the quantity of slag.And in different Cu smelting process in slag copper content maintain between 0.42%～4.6%, be close to or higher than the former copper ore grade of smelting value, recovery value is higher.Copper ashes is directly adopted and stores up or be waste resource really as the zero-emission that construction material is realized slag.
How effectively reclaiming valuable component and residual heat resources in metallurgy of copper slag, realize copper ashes resource, is the emphasis of current non-ferrous metal metallurgical industry technological development.Desirable copper ashes waste heat and valuable metal recovery technique should be to reclaim expeditiously afterheat of slags and valuable metal, and realize the high added value of slag product simultaneously.Reach these two targets indispensable to realizing the commercialized running of copper ashes recycling recovery process, but have certain paradox between two targets.Exploitation improves new technology, new technology, the new equipment of copper ashes added value of product when improving copper ashes waste heat and valuable metal recovery efficiency, this will be that copper ashes resource reclaims the key issue that research need to solve.
Summary of the invention
The problem and the deficiency that for above-mentioned prior art, exist, the invention provides low carbonization method of comprehensive utilization after a kind of copper ashes melting and reducing.The present invention utilizes copper ashes waste heat pyrolysis of gasified bio-matter to prepare combustible gas and biomass carbon technique, and the technical method being coupled with melting and reducing copper ashes technique, it is the metallurgical associating of a kind of low-carbon (LC) new technology, around the several significant process that relate to during metallurgy of copper slag recycling treatment is produced, to make full use of the sensible heat of copper ashes, latent heat and molten copper slag component characteristic, Efficient Cycle and application and the coupling of living beings regenerative resource in low-carbon (LC) metallurgy of residual heat resources in outstanding copper ashes, the process efficiency of valuable metal enrichment and direct-reduction coupling technique integrated, can realize valuable metal Cu in copper ashes, the high efficiente callback of Fe etc., waste heat effectively utilizes and residue is innoxious and the target of recycling.
The present invention is at copper ashes method for melting reduction iron making, utilize on the basis of pyrometallurgy flue gas charing biomass-making for biomass carbon technology and the mixed Industrial Technology of Gasification of Biomass With Fluidized-bed of metallurgical cinder, in conjunction with copper ashes melting and reducing, extract valuable metal and need outside heat and the reducing agent supplied with, the a large amount of heat energy of the cooling release of slag, biomass-making belongs to the features such as endothermic process for combustible gas and carbonaceous reductant, in solution copper ashes, recovery rate of valuable metals is low, melting slag waste heat is difficult to the technical barrier reclaiming, the low-carbon (LC) metallurgical of the copper ashes melting and reducing of valuable metal and waste heat in a kind of copper ashes melting and reducing-smoke gas pyrolysis living beings-melting residue gasified bio-matter three system, coupled high efficiente callback copper slags is provided, the present invention is achieved through the following technical solutions.
A low carbonization method of comprehensive utilization after melting and reducing, its concrete steps are as follows:
(1) copper ashes melting reduction method: first by copper ashes, flux and carbonaceous reductant mix and obtain mixed material, wherein the mass ratio of copper ashes and flux is 100:(45～70), then spraying into jetting pressure is the combustible gas supplemental heat source of 50～250kPa, after mixed material is heated to temperature and is 1500～1600 ℃ of abundant meltings, the gas that passes into jetting pressure and be 30～300kPa carries out after oxidation sweetening 10～30min, stop passing into gas, make melting mixing material through the reduction reaction of 30～60min, rear acquisition crude metal raw material and residue have been reacted, in this process, also will produce high-temperature flue gas,
(2) byproduct that step (1) obtains utilize method:
(2.1) high-temperature flue gas utilizes method: the high-temperature flue gas first step (1) being obtained carries out second-time burning, then the high-temperature flue gas after second-time burning is cooled to 850～900 ℃ through UTILIZATION OF VESIDUAL HEAT IN, the high-temperature flue gas that using temperature is finally 850～900 ℃ is 1:(1～3 according to the mass ratio of high-temperature flue gas and living beings) be passed in biomass pyrolytic charing process as outer thermal source, in biomass pyrolytic charing process, obtain pyrolysis gas and flue gas, after biomass pyrolytic charing reaction finishes, will prepare biomass carbon, flue gas is discharge after purifying;
(2.2) residue utilizes method: the residue first step (1) being obtained solidifies and the broken residue temperature of controlling of mechanical disruption is that 900～950 ℃, particle diameter are below 1mm through water cooling, wherein in cooling procedure, the mass ratio of residue and cooling water is 1:(0.2～0.5), then according to mass ratio, be 1:(0.5～0.8 with powdered biomass) join in fluidisation state biomass gasifying furnace after mixing, spraying into generating gasification reaction under the gasifying agent condition that jetting pressure is 0.2～0.5MPa, in this process, produce combustible gas and slag, slag is as architectural engineering raw material;
(3) byproduct that step (2) obtains utilize method:
(3.1) pyrolysis gas utilizes method: the pyrolysis gas that step (2.1) is obtained is after modified, and a part is returned to step (1) supplemental heat source through supercharging as combustible gas, and another part prepares high-quality combustion gas after purifying;
(3.2) biomass carbon utilizes method: the biomass carbon part that step (2.1) is obtained is returned to step (1) as carbonaceous reductant, and another part is prepared as metallurgical reducing agent;
(3.3) combustible gas utilizes method: the combustible gas that step (2.2) is obtained is after modified, and a part is returned to step (1) supplemental heat source through supercharging as combustible gas, and another part prepares high-quality combustion gas after purifying.
In described step (1), copper ashes is hot slag or the Water Quenching Slag of copper smelting process, and copper ashes comprises the component of following mass percent: FeO30～55%, Fe
3o
43～15%, SiO
222～38%, CaO0.1～3%, Al
2o
31～12%.
In described step (1), flux is lime stone or dolomite.
In described step (1), the addition of carbonaceous reductant is 25～50% of copper ashes quality.
In described step (1), gas is one or more arbitrary proportion mists of air, oxygen enrichment, oxygen.
In described step (2.2), gasifying agent is steam, oxygen and air, the steam that steam produces in the cooling procedure by cooling water from residue in step (2.2).
UTILIZATION OF VESIDUAL HEAT IN process in above-mentioned steps (2.1) is for passing through waste heat boiler output steam or the direct generation of electricity.
Above-mentioned steps (2.1) gas cleaning process: remove the pernicious gas such as contained sulfur dioxide, nitrogen oxide in flue gas by wash mill, reach emptying requirement.
The invention has the beneficial effects as follows: (1) realizes the new breakthrough that metallurgical process is changed to low-carbon technology by high charcoal technology; (2) effectively reclaim the valuable metal in copper ashes, metal recovery rate reaches more than 90%, and copper ashes resource is effective; (3) the high-temperature flue gas waste heat that smelting reduction process produces has promoted biomass carbonated conversion ratio, for the recovery of metallurgical gas waste heat provides a kind of effective approach; (4) high-temperature slag and living beings mixing gasifying have reclaimed the waste heat of liquid slag effectively, for biomass energy upgrading and rationalization utilization provide new way; (5) copper ashes melting and reducing recovery valuable metal, the charcoal processing of high-temperature flue gas pyrolysis of gasified bio-matter and hot-engine sludge mixing gasifying biomass-making are new methods that metallurgical technology and biomass energy Conversion with the use technology organically combine for combustible gas three system, coupled technology.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1
As shown in Figure 1, low carbonization method of comprehensive utilization after this copper ashes melting and reducing, its concrete steps are as follows:
(1) copper ashes melting reduction method: first by copper ashes, flux and carbonaceous reductant mix and obtain mixed material, wherein the mass ratio of copper ashes and flux is 100:45, then spraying into jetting pressure is the combustible gas supplemental heat source of 50kPa, after mixed material is heated to temperature and is 1500 ℃ of abundant meltings, the gas that passes into jetting pressure and be 30kPa carries out after oxidation sweetening 10min, stop passing into gas, make melting mixing material through the reduction reaction of 30min, rear acquisition crude metal raw material and residue have been reacted, in this process, also will produce high-temperature flue gas, wherein copper ashes is the hot slag of copper smelting process, copper ashes comprises the component of following mass percent: FeO30%, Fe
3o
415%, SiO
222%, CaO0.1%, Al
2o
312%, flux is lime stone, and the addition of carbonaceous reductant is 25% of copper ashes quality, and gas is air,
(2) byproduct that step (1) obtains utilize method:
(2.1) high-temperature flue gas utilizes method: the high-temperature flue gas first step (1) being obtained carries out second-time burning, then the high-temperature flue gas after second-time burning is cooled to 850 ℃ through UTILIZATION OF VESIDUAL HEAT IN, the high-temperature flue gas that using temperature is finally 850 ℃ is that 1:1 is passed in biomass pyrolytic charing process as outer thermal source according to the mass ratio of high-temperature flue gas and living beings, in biomass pyrolytic charing process, obtain pyrolysis gas and flue gas, after biomass pyrolytic charing reaction finishes, will prepare biomass carbon, flue gas is discharge after purifying;
(2.2) residue utilizes method: it is 900 ℃ that the residue first step (1) being obtained solidifies the also broken control of mechanical disruption residue temperature through water cooling, particle diameter is below 1mm, wherein in cooling procedure, the mass ratio of residue and cooling water is 1:0.2, then according to mass ratio, be after 1:0.5 mixes, to join in fluidisation state biomass gasifying furnace with powdered biomass, spraying into generating gasification reaction under the gasifying agent condition that jetting pressure is 0.2MPa, in this process, produce combustible gas and slag, slag is as architectural engineering raw material, wherein gasifying agent is steam, oxygen and air, the steam that steam produces in the cooling procedure by cooling water from residue,
(3) byproduct that step (2) obtains utilize method:
(3.1) pyrolysis gas utilizes method: the pyrolysis gas that step (2.1) is obtained is after modified, and a part is returned to step (1) supplemental heat source through supercharging as combustible gas, and another part prepares high-quality combustion gas after purifying;
(3.2) biomass carbon utilizes method: the biomass carbon part that step (2.1) is obtained is returned to step (1) as carbonaceous reductant, and another part is prepared as metallurgical reducing agent;
(3.3) combustible gas utilizes method: the combustible gas that step (2.2) is obtained is after modified, and a part is returned to step (1) supplemental heat source through supercharging as combustible gas, and another part prepares high-quality combustion gas after purifying.
Wherein the UTILIZATION OF VESIDUAL HEAT IN process in step (2.1) is the direct generation of electricity; Step (2.1) gas cleaning process: remove the pernicious gas such as contained sulfur dioxide, nitrogen oxide in flue gas by wash mill, reach emptying requirement.
Embodiment 2
As shown in Figure 1, low carbonization method of comprehensive utilization after this copper ashes melting and reducing, its concrete steps are as follows:
(1) copper ashes melting reduction method: first by copper ashes, flux and carbonaceous reductant mix and obtain mixed material, wherein the mass ratio of copper ashes and flux is 100:70, then spraying into jetting pressure is the combustible gas supplemental heat source of 250kPa, after mixed material is heated to temperature and is 1600 ℃ of abundant meltings, the gas that passes into jetting pressure and be 300kPa carries out after oxidation sweetening 30min, stop passing into gas, make melting mixing material through the reduction reaction of 60min, rear acquisition crude metal raw material and residue have been reacted, in this process, also will produce high-temperature flue gas, wherein copper ashes is the Water Quenching Slag of copper smelting process, copper ashes comprises the component of following mass percent: FeO55%, Fe
3o
43%, SiO
238%, CaO3%, Al
2o
31%, flux is dolomite, and the addition of carbonaceous reductant is 50% of copper ashes quality, and gas is oxygen enrichment and the oxygen mixed gas of volume ratio 1:1,
(2) byproduct that step (1) obtains utilize method:
(2.1) high-temperature flue gas utilizes method: the high-temperature flue gas first step (1) being obtained carries out second-time burning, then the high-temperature flue gas after second-time burning is cooled to 900 ℃ through UTILIZATION OF VESIDUAL HEAT IN, the high-temperature flue gas that using temperature is finally 900 ℃ is that 1:3 is passed in biomass pyrolytic charing process as outer thermal source according to the mass ratio of high-temperature flue gas and living beings, in biomass pyrolytic charing process, obtain pyrolysis gas and flue gas, after biomass pyrolytic charing reaction finishes, will prepare biomass carbon, flue gas is discharge after purifying;
(2.2) residue utilizes method: it is 950 ℃ that the residue first step (1) being obtained solidifies the also broken control of mechanical disruption residue temperature through water cooling, particle diameter is 0.8mm, wherein in cooling procedure, the mass ratio of residue and cooling water is 1:0.5, then according to mass ratio, be after 1:0.8 mixes, to join in fluidisation state biomass gasifying furnace with powdered biomass, spraying into generating gasification reaction under the gasifying agent condition that jetting pressure is 0.5MPa, in this process, produce combustible gas and slag, slag is as architectural engineering raw material, wherein gasifying agent is steam, oxygen and air, the steam that steam produces in the cooling procedure by cooling water from residue in step (2.2),
(3) byproduct that step (2) obtains utilize method:
(3.1) pyrolysis gas utilizes method: the pyrolysis gas that step (2.1) is obtained is after modified, and a part is returned to step (1) supplemental heat source through supercharging as combustible gas, and another part prepares high-quality combustion gas after purifying;
(3.2) biomass carbon utilizes method: the biomass carbon part that step (2.1) is obtained is returned to step (1) as carbonaceous reductant, and another part is prepared as metallurgical reducing agent;
(3.3) combustible gas utilizes method: the combustible gas that step (2.2) is obtained is after modified, and a part is returned to step (1) supplemental heat source through supercharging as combustible gas, and another part prepares high-quality combustion gas after purifying.
Wherein the UTILIZATION OF VESIDUAL HEAT IN process in step (2.1) is for passing through waste heat boiler output steam; Step (2.1) gas cleaning process: remove the pernicious gas such as contained sulfur dioxide, nitrogen oxide in flue gas by wash mill, reach emptying requirement.
Embodiment 3
As shown in Figure 1, low carbonization method of comprehensive utilization after this copper ashes melting and reducing, its concrete steps are as follows:
(1) copper ashes melting reduction method: first by copper ashes, flux and carbonaceous reductant mix and obtain mixed material, wherein the mass ratio of copper ashes and flux is 100:50, then spraying into jetting pressure is the combustible gas supplemental heat source of 100kPa, after mixed material is heated to temperature and is 1550 ℃ of abundant meltings, the gas that passes into jetting pressure and be 280kPa carries out after oxidation sweetening 20min, stop passing into gas, make melting mixing material through the reduction reaction of 40min, rear acquisition crude metal raw material and residue have been reacted, in this process, also will produce high-temperature flue gas, wherein copper ashes is the hot slag of copper smelting process, copper ashes comprises the component of following mass percent: FeO40%, Fe
3o
49%, SiO
230%, CaO2%, Al
2o
36%, flux is dolomite, and the addition of carbonaceous reductant is 40% of copper ashes quality, and gas is oxygen enrichment,
(2) byproduct that step (1) obtains utilize method:
(2.1) high-temperature flue gas utilizes method: the high-temperature flue gas first step (1) being obtained carries out second-time burning, then the high-temperature flue gas after second-time burning is cooled to 880 ℃ through UTILIZATION OF VESIDUAL HEAT IN, the high-temperature flue gas that using temperature is finally 880 ℃ is that 1:2 is passed in biomass pyrolytic charing process as outer thermal source according to the mass ratio of high-temperature flue gas and living beings, in biomass pyrolytic charing process, obtain pyrolysis gas and flue gas, after biomass pyrolytic charing reaction finishes, will prepare biomass carbon, flue gas is discharge after purifying;
(2.2) residue utilizes method: it is 930 ℃ that the residue first step (1) being obtained solidifies the also broken control of mechanical disruption residue temperature through water cooling, particle diameter is below 1mm, wherein in cooling procedure, the mass ratio of residue and cooling water is 1:0.4, then according to mass ratio, be after 1:0.6 mixes, to join in fluidisation state biomass gasifying furnace with powdered biomass, spraying into generating gasification reaction under the gasifying agent condition that jetting pressure is 0.4MPa, in this process, produce combustible gas and slag, slag is as architectural engineering raw material, wherein gasifying agent is steam, oxygen and air, the steam that steam produces in the cooling procedure by cooling water from residue in step (2.2),
(3) byproduct that step (2) obtains utilize method:
(3.1) pyrolysis gas utilizes method: the pyrolysis gas that step (2.1) is obtained is after modified, and a part is returned to step (1) supplemental heat source through supercharging as combustible gas, and another part prepares high-quality combustion gas after purifying;
(3.2) biomass carbon utilizes method: the biomass carbon part that step (2.1) is obtained is returned to step (1) as carbonaceous reductant, and another part is prepared as metallurgical reducing agent;
(3.3) combustible gas utilizes method: the combustible gas that step (2.2) is obtained is after modified, and a part is returned to step (1) supplemental heat source through supercharging as combustible gas, and another part prepares high-quality combustion gas after purifying.
Wherein the UTILIZATION OF VESIDUAL HEAT IN process in step (2.1) is for passing through waste heat boiler output steam; Step (2.1) gas cleaning process: remove the pernicious gas such as contained sulfur dioxide, nitrogen oxide in flue gas by wash mill, reach emptying requirement.
Claims (6)
1. a low carbonization method of comprehensive utilization after copper ashes melting and reducing, is characterized in that concrete steps are as follows:
(1) copper ashes melting reduction method: first by copper ashes, flux and carbonaceous reductant mix and obtain mixed material, wherein the mass ratio of copper ashes and flux is 100:(45～70), then spraying into jetting pressure is the combustible gas supplemental heat source of 50～250kPa, after mixed material is heated to temperature and is 1500～1600 ℃ of abundant meltings, the gas that passes into jetting pressure and be 30～300kPa carries out after oxidation sweetening 10～30min, stop passing into gas, make melting mixing material through the reduction reaction of 30～60min, rear acquisition crude metal raw material and residue have been reacted, in this process, also will produce high-temperature flue gas,
(2) byproduct that step (1) obtains utilize method:
(2.1) high-temperature flue gas utilizes method: the high-temperature flue gas first step (1) being obtained carries out second-time burning, then the high-temperature flue gas after second-time burning is cooled to 850～900 ℃ through UTILIZATION OF VESIDUAL HEAT IN, the high-temperature flue gas that using temperature is finally 850～900 ℃ is 1:(1～3 according to the mass ratio of high-temperature flue gas and living beings) be passed in biomass pyrolytic charing process as outer thermal source, in biomass pyrolytic charing process, obtain pyrolysis gas and flue gas, after biomass pyrolytic charing reaction finishes, will prepare biomass carbon, flue gas is discharge after purifying;
(2.2) residue utilizes method: the residue first step (1) being obtained solidifies and the broken residue temperature of controlling of mechanical disruption is that 900～950 ℃, particle diameter are below 1mm through water cooling, wherein in cooling procedure, the mass ratio of residue and cooling water is 1:(0.2～0.5), then according to mass ratio, be 1:(0.5～0.8 with powdered biomass) join in fluidisation state biomass gasifying furnace after mixing, spraying into generating gasification reaction under the gasifying agent condition that jetting pressure is 0.2～0.5MPa, in this process, produce combustible gas and slag, slag is as architectural engineering raw material;
(3) byproduct that step (2) obtains utilize method:
(3.1) pyrolysis gas utilizes method: the pyrolysis gas that step (2.1) is obtained is after modified, and a part is returned to step (1) supplemental heat source through supercharging as combustible gas, and another part prepares high-quality combustion gas after purifying;
(3.2) biomass carbon utilizes method: the biomass carbon part that step (2.1) is obtained is returned to step (1) as carbonaceous reductant, and another part is prepared as metallurgical reducing agent;
(3.3) combustible gas utilizes method: the combustible gas that step (2.2) is obtained is after modified, and a part is returned to step (1) supplemental heat source through supercharging as combustible gas, and another part prepares high-quality combustion gas after purifying.
2. low carbonization method of comprehensive utilization after copper ashes melting and reducing according to claim 1, it is characterized in that: in described step (1), copper ashes is hot slag or the Water Quenching Slag of copper smelting process, and copper ashes comprises the component of following mass percent: FeO30～55%, Fe
3o
43～15%, SiO
222～38%, CaO0.1～3%, Al
2o
31～12%.
3. low carbonization method of comprehensive utilization after copper ashes melting and reducing according to claim 1 and 2, is characterized in that: in described step (1), flux is lime stone or dolomite.
4. low carbonization method of comprehensive utilization after copper ashes melting and reducing according to claim 1 and 2, is characterized in that: in described step (1), the addition of carbonaceous reductant is 25～50% of copper ashes quality.
5. low carbonization method of comprehensive utilization after copper ashes melting and reducing according to claim 1 and 2, is characterized in that: in described step (1), gas is one or more arbitrary proportion mists of air, oxygen enrichment, oxygen.
6. low carbonization method of comprehensive utilization after copper ashes melting and reducing according to claim 1 and 2, it is characterized in that: in described step (2.2), gasifying agent is steam, oxygen and air the steam that steam produces in the cooling procedure by cooling water from residue in step (2.2).
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