CN104263951A - Method for processing copper dross by using rotary furnace through pure oxygen side-blown bath smelting - Google Patents

Method for processing copper dross by using rotary furnace through pure oxygen side-blown bath smelting Download PDF

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CN104263951A
CN104263951A CN201410489388.6A CN201410489388A CN104263951A CN 104263951 A CN104263951 A CN 104263951A CN 201410489388 A CN201410489388 A CN 201410489388A CN 104263951 A CN104263951 A CN 104263951A
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copper
slag
gas
copper dross
oxygen
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CN104263951B (en
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杨华锋
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HENAN GOLD RAKEM LEAD Co Ltd
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HENAN GOLD RAKEM LEAD Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a method for processing copper dross by using a rotary furnace through pure oxygen side-blown bath smelting. The method comprises the following steps: uniformly mixing copper dross, scrap iron, carbon granules and scorched particles firstly, continuously and uniformly adding the obtained mixture into the side-blowing rotary furnace, and in the process of material adding, feeding oxygen and coke oven gas into the furnace; after the material adding is completed, when a strengthened smelting period begins and the scale mark of copper dross smelting slag is at 900-950 mm, sucking lead bullions out of the furnace from a siphon channel at the furnace end; after the melting is completed, carrying out static precipitation for 1-2 hours, after the precipitation is completed, discharging copper mattes and slag from a slag outlet in the upper part of the furnace, and then carrying out settlement and separation; and carrying out waste heat recovery and two-stage dust removal on flue gas, enabling the obtained gas to pass through a dearsenification device so as to recover arsenic, returning smoke dust for reuse or sale, feeding tail gas into a desulfurization tower, and after waste gas discharged from the desulfurization tower is up to the standard, discharging the waste gas. Compared with the prior art, the method is high in hearth efficiency, low in cost, and good in furnace sealing; no spillover of flue gas occurs at a feed inlet, so that the method is good in operating environment and good in environmental protection benefit; and the method is high in degree of automation and high in smelting recovery rate, and has good social and economic benefits.

Description

The method of pure oxygen side-blowing bath melting rotary oven process copper dross slag
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of method of pure oxygen side-blowing bath melting rotary oven process copper dross slag.
Background technology
Copper dross slag is the product of fire refining of crude lead, and in copper ore concentrates, association has a small amount of copper, and these copper enter lead bullion in plumbous smelting process, output copper dross slag when carrying out liquation decoppering when the refining of lead bullion.Copper smelting scum silica frost not only can realize synthetical recovery, and can improve Business Economic Benefit, improves the rate of recovery.
Copper dross slag treatment process has Blast Furnace Method, reflection oven process, converter process, electric furnace process, pickling process, ammonia leaching process etc. both at home and abroad at present.Blast furnace process copper dross slag, Cu/Pb lower (only having 2 ~ 3) in copper matte regulus, the rate of recovery of copper is low, and a large amount of copper is stayed in lead bullion, causes copper, arsenic and precious metal to circulate during the course.Reflection furnace process labor condition is poor, thermo-efficiency is low and blowing-ouf of lines block, maintenance frequently, be classified as time limit by country and eliminate technique.Rotary kiln (also known as rotary furnace) processes copper dross slag and there is diesel consumption comparatively large (5 ~ 6%), and production cost is higher.The shortcomings such as electric furnace process exists power consumption high (power consumption 340 ~ 380kwh/t, coke 40 ~ 50kg/t), and running cost is high, are difficult in the area of power tense realize.Pickling process, ammonia leaching process, owing to being all the reaction principle utilizing metallic copper in copper dross slag and solvent, being applicable to the copper dross slag that Treatment of Copper is high, dealing with uneconomical for the copper dross slag that cupric is low.Generally speaking, existing copper removal residues processing technique is refine the smelting technology that the plumbous epoch match with sinter machine substantially, and in today of plumbous smelting technology develop rapidly, these technology have not met the requirement of modern non-ferrous metal metallurgy process low-carbon, environmental protection, automatization.
Contriver had once carried out the experiment of bottom-blown smelting copper dross slag, and somebody has carried out the experiment of top blow smelting copper dross slag.Bottom-blown smelting causes precipitate and separate effect bad owing to lacking sedimentation time, be mainly reflected in Cu-Pb separation weak effect, the indexs such as lead bullion cupric, copper matte regulus are leaded are all poor, and lead bullion cupric is up to 6-8%, copper matte regulus is leaded up to 20%, and mainly owing to lacking in shaft furnace, thermograde causes for this; Top blow smelting is non-pure oxygen due to employing oxygen enrichment, therefore still has energy consumption higher, the shortcoming that specific capacity is not high.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art and provide a kind of less investment, energy consumption low, reduce environmental pollution, level of automation is high, process operation manageable pure oxygen bath smelting side-blowing bath rotary oven process copper dross slag technique.
For achieving the above object, the present invention is by the following technical solutions: the method for pure oxygen side-blowing bath melting rotary oven process copper dross slag, comprises the following steps:
(1) copper dross slag, iron filings, carbon granules, burnt grain are mixed according to the ratio of 100:2 ~ 4:1.5 ~ 3:1 ~ 2, disk feeder is added with overhead traveling crane, side-blown rotary oven is added by adhesive tape conveyor continuous uniform, feed temperature is 800-900 DEG C, while feeding intake, in stove, blast oxygen, coke-oven gas by rotary oven side spray gun;
(2) charging is complete, enters the intensified smelting phase, at temperature 1100-1200 DEG C of melting 1-2h; Copper dross slag melting slag scale marks is when 900-950mm, and lead bullion is from the siphon sucking-off stove of stove end, and ingot casting is sent to rectification systems;
(3) melting is complete, rotates rotary oven, quiescent setting 1-2 hour, and precipitation terminates, and slag-drip opening from stove top releases copper matte regulus and slag, then carries out sedimentation, separation, is sent to copper metallurgy industry after ingot casting, and slagging terminates rear continuation and to feed in raw material melting;
(4) flue gas is through waste heat recovery and two-stage dedusting, reclaims arsenic through dearsenification device, and flue dust returns step (2) recycling or sells outward, and tail gas enters thionizer, the rear discharge up to standard of thionizer waste gas out.
In step (1), copper dross slag, iron filings, carbon granules, burnt grain mix according to the ratio of 100:2:1.5:1.
Feed intake according to 12 ~ 13 tons of copper dross slag batch mixing amounts per hour in step (1).
Step blasts oxygen, coke-oven gas in (1) in stove, and gas main flow is 550-600m 3/ h, oxygen total flux 420m 3/ h.
The intensified smelting phase in step (2), gas main flow is 650-700m 3/ h, oxygen total flux 500m 3/ h.
Step blasts oxygen, coke-oven gas in (1) in stove, and gas main pressure is 0.25MPa, and a pipe pressure is 0.2MPa; Gas main pressure is 0.6MPa, and a pipe pressure is 0.22MPa.
The present invention of technique scheme is adopted to have the following advantages:
A. pure oxygen side-blowing bath melting rotary oven is molten pool melting technology applying and development of new techniques in smelting field of nonferrous metal, is plumbous further upgrading of smelting serial new technology, has very high to put into practice promotional value.
B., compared with conventional types of furnaces, this technology has that specific capacity is high, cost is low, furnace sealing is good, charging opening without excessive flue gas, good operational environment; Environmental benefit is good, and dust, CO2, SO2 and uncontrollable discharge amount all comparatively conventional types of furnaces obviously reduce; The advantages such as level of automation is high, whole process implementation DCS on-line monitoring.
C. smelting recovery is high, and copper recovery reaches more than 95%, lead recovery more than 92%; Supportingly have employed arsenic chilling recovery technology, can arsenic in Separation and Recovery process copper dross slag.
D. there is good Social benefit and economic benefit:
(1) reduce costs: pure oxygen side-blown rotary oven and the contrast of reverberatory furnace worked copper scum silica frost lead bullion tooling cost are in table 1:
Table 1 pure oxygen side-blown rotary oven and reverberatory furnace worked copper scum silica frost lead bullion tooling cost contrast table
Can draw from upper table, the plumbous cost of pure oxygen side-blown converter ton declines 83.4 yuan than reverberatory furnace, calculates by annual output 30000 tons of lead bullion, can be cost-saving 250.2 ten thousand yuan.
(2) improve metal recovery rate: pure oxygen side-blown rotary oven and the contrast of reverberatory furnace worked copper scum silica frost metal recovery rate are in table 2:
Table 2 pure oxygen side-blown rotary oven and the contrast of reverberatory furnace the key technical indexes
Sequence number Index Unit Pure oxygen side-blown converter Reverberatory furnace
1 Lead bullion cupric 1.2 1.6
2 Copper matte regulus lead bronze ratio 24.56 31.16
3 Copper recovery 95.2 93.4
4 Lead recovery 92.3 90.1
As can be seen from the above table, pure oxygen side-blown converter is compared with reverberatory furnace, and copper recovery improves 1.8%, calculates by annual output 10000 tons of copper, 180 tons can be increased production, realize benefit 8,000,000 yuan, lead recovery improves 1.2%, calculates by annual output 30000 tons lead, 660 tons can be increased production, realize benefit 9,200,000 yuan, two totals, benefit 1,720 ten thousand yuan can be realized year.
(3) reduce energy consumption: pure oxygen side-blown rotary oven and reverberatory furnace worked copper scum silica frost energy consumption comparison are in table 3 and table 4:
Table 3 pure oxygen side-blown converter test manufacture energy consumption statistic
Table 4 reverberatory furnace energy consumption statistic
As can be seen from the above table, compared with reverberatory furnace, pure oxygen side-blown converter energy consumption decrease beyond 50%, is only 48.17% of reverberatory furnace, adds up to, can realize energy-conservation 3546 tons year by annual output 30000 tons of lead bullion.
The main economic and technical indices of the various copper dross slag treatment process of table 5 compares
As can be seen from the above table, pure oxygen side-blown rotary oven process copper dross slag technique is better than current several traditional copper scum silica frost treatment process in main economic and technical indices, is also better than the two kinds of bath smelting techniques tested.But at investing, due to reasons such as environmental protection facility increase, level of automation increases, pure oxygen side-blown rotary oven technology investment increases many than traditional technology, when treatment scale is identical, be about 3 times of reverberatory furnace technology investment.
To sum up calculate, after adopting pure oxygen side-blown converter, benefit 1,970 ten thousand yuan can be realized company's year, realize energy-conservation 3546 tons, achieve the synchronous increase of economic benefit and social benefit.
Generally speaking, this technology and bottom blowing molten pool melting, liquid high lead dross Direct Reductive Melting are the same, are molten pool melting technology applying at plumbous smelting industry.Along with this technology improve and ripe, the technology upgrading substituting conventional types of furnaces is regenerated inevitable, and this technology plays prograding energetically by improving the upgrading of Lead for China smelting technology.
Accompanying drawing explanation
Fig. 1 is pure oxygen side-blowing bath melting rotary oven process copper dross slag process flow sheet of the present invention.
Embodiment
Selection model is the rotary oven of Φ 3500 × 9000mm, according to following technical parameter commissioning device:
1. electric precipitation inlet temperature 420 DEG C-350 DEG C, temperature out 380 DEG C-300 DEG C;
2. pulsed jet cloth filter import less than 220 DEG C, exports less than 180 DEG C, normally;
3. coke-oven gas total flux 550-600m 3/ h, coke-oven gas manifold pressure 0.25MPa, a pipe pressure 0.2MPa;
Oxygen total flux 420m 3/ h, oxygen manifold pressure 0.6MPa, a pipe pressure 0.22MPa.
Equipment debugging is complete, according to steps of processing copper dross slag:
(1) as shown in Figure 1, copper dross slag, iron filings, carbon granules, burnt grain are mixed according to the ratio of 100:2:1.5:1, disk feeder is added with overhead traveling crane, side-blown rotary oven is added by adhesive tape conveyor continuous uniform, feed intake according to 12 ~ 13 tons of copper dross slag batch mixing amounts per hour, within 5 hours, complete 60 tons of charging operations, feed temperature is 800-900 DEG C, while feeding intake, in stove, blast oxygen, coke-oven gas by rotary oven side spray gun;
(2) charging is complete, enters the intensified smelting phase, at temperature 1100-1200 DEG C of melting 1-2h; Charging about 18 tons, copper dross slag melting slag scale marks is when 900-950mm, and lead bullion is from the siphon sucking-off stove of stove end, and ingot casting is sent to rectification systems, and siphon will often be dredged, and within every 1 hour, detects slag in a stove, observes situation in blanking and stove;
(3) melting is complete, rotate rotary oven, quiescent setting 1-2 hour, precipitation terminates to check converter mechanism, staff on duty, and the slag-drip opening from stove top releases copper matte regulus and slag, put copper matte regulus and slag about 1 hour, then carry out sedimentation, separation, be sent to copper metallurgy industry after ingot casting, slagging terminates rear continuation and to feed in raw material melting;
(4) flue gas is through waste heat recovery and two-stage dedusting, reclaims arsenic through dearsenification device, and flue dust returns in step (2) and reuses or sell outward, and tail gas enters thionizer, the rear discharge up to standard of thionizer waste gas out.
Per tour process copper dross slag 60 tons, about produce 16 tons, lead bullion 40 tons, copper matte regulus and slag, 3 tons, cigarette ash, per tour coke-oven coal tolerance is about 4400m 3, amount of oxygen 3100m 3.Output lead bullion grade between 95-98, containing Cu lower than 1.2%.Output copper matte regulus leaded 10 ~ 12%, normal lead tolerance is stabilized in less than 12%.
The present invention according to copper dross slag not only cupric but also leaded while accompaning goldsilver characteristic, focus on the separating effect improving copper-lead, reduce valuable metal to have enough to meet the need in material, the centre of minimizing fund takies, technology and the processing parameter of pyrometallurgical smelting copper dross slag are reasonably strengthened in exploitation, select practical reasonably melting equipment, the productivity of raising system and Cu-Pb separation effect, reduce energy consumption, save energy, output lead bullion cupric is lower than 2%, copper matte regulus copper-lead ratio is greater than 3:1, the plumbous energy consumption relative reflection furnaceman skill of ton declines 50%, reduce labour intensity, decreasing pollution, realize Production Flow Chart automatization.

Claims (6)

1. the method for pure oxygen side-blowing bath melting rotary oven process copper dross slag, is characterized in that: comprise the following steps:
Copper dross slag, iron filings, carbon granules, burnt grain are mixed according to the ratio of 100:2 ~ 4:1.5 ~ 3:1 ~ 2, disk feeder is added with overhead traveling crane, side-blown rotary oven is added by adhesive tape conveyor continuous uniform, feed temperature is 800-900 DEG C, while feeding intake, in stove, blast oxygen, coke-oven gas by rotary oven side spray gun;
Charging is complete, enters the intensified smelting phase, at temperature 1100-1200 DEG C of melting 1-2h; Copper dross slag melting slag groove is when 900-950mm, and lead bullion is from the siphon sucking-off stove of stove end, and ingot casting is sent to rectification systems;
Melting is complete, rotates rotary oven, quiescent setting 1-2 hour, and precipitation terminates, and slag-drip opening from stove top releases copper matte regulus and slag, then carries out sedimentation, separation, is sent to copper metallurgy industry after ingot casting, and slagging terminates rear continuation and to feed in raw material melting;
Flue gas, through waste heat recovery and two-stage dedusting, reclaims arsenic through dearsenification device, and flue dust returns step (2) recycling or sells outward, and tail gas enters thionizer, the rear discharge up to standard of thionizer waste gas out.
2. the method for pure oxygen side-blowing bath melting rotary oven process copper dross slag according to claim 1, is characterized in that: in step (1), copper dross slag, iron filings, carbon granules, burnt grain mix according to the ratio of 100:2:1.5:1.
3. the method for pure oxygen side-blowing bath melting rotary oven process copper dross slag according to claim 1, is characterized in that: feed intake according to 12 ~ 13 tons of copper dross slag batch mixing amounts per hour in step (1).
4. the method for pure oxygen side-blowing bath melting rotary oven process copper dross slag according to claim 1, it is characterized in that: step blasts oxygen, coke-oven gas in (1) in stove, gas main flow is 550-600m 3/ h, oxygen total flux 420m 3/ h.
5. the method for pure oxygen side-blowing bath melting rotary oven process copper dross slag according to claim 1, is characterized in that: the intensified smelting phase in step (2), gas main flow is 650-700m 3/ h, oxygen total flux 500m 3/ h.
6. the method for pure oxygen side-blowing bath melting rotary oven process copper dross slag according to claim 1, it is characterized in that: step blasts oxygen, coke-oven gas in (1) in stove, gas main pressure is 0.25MPa, and a pipe pressure is 0.2MPa; Gas main pressure is 0.6MPa, and a pipe pressure is 0.22MPa.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105624393A (en) * 2015-12-31 2016-06-01 耒阳市焱鑫有色金属有限公司 Proportioning method for sintering arsenic-removing and sulfur-removing raw material
CN112981134A (en) * 2021-04-22 2021-06-18 中国恩菲工程技术有限公司 Continuous copper smelting process and continuous copper smelting system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101358286A (en) * 2008-09-25 2009-02-04 昆明理工大学 Method for treating copper scum using converter
JP2010007135A (en) * 2008-06-27 2010-01-14 Sumitomo Metal Mining Co Ltd Horizontal-type rotary kiln for sulfurizing and refining, and method for sulfurizing-refining copper-dross using the same
CN102643996A (en) * 2012-05-23 2012-08-22 云南驰宏锌锗股份有限公司 Method for producing lead bullion by means of copper dross side-blown smelting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010007135A (en) * 2008-06-27 2010-01-14 Sumitomo Metal Mining Co Ltd Horizontal-type rotary kiln for sulfurizing and refining, and method for sulfurizing-refining copper-dross using the same
CN101358286A (en) * 2008-09-25 2009-02-04 昆明理工大学 Method for treating copper scum using converter
CN102643996A (en) * 2012-05-23 2012-08-22 云南驰宏锌锗股份有限公司 Method for producing lead bullion by means of copper dross side-blown smelting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105624393A (en) * 2015-12-31 2016-06-01 耒阳市焱鑫有色金属有限公司 Proportioning method for sintering arsenic-removing and sulfur-removing raw material
CN112981134A (en) * 2021-04-22 2021-06-18 中国恩菲工程技术有限公司 Continuous copper smelting process and continuous copper smelting system

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