CN100540697C - A kind of method of converting furnace oxygen-enriched air converting copper - Google Patents
A kind of method of converting furnace oxygen-enriched air converting copper Download PDFInfo
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- CN100540697C CN100540697C CNB2007101852193A CN200710185219A CN100540697C CN 100540697 C CN100540697 C CN 100540697C CN B2007101852193 A CNB2007101852193 A CN B2007101852193A CN 200710185219 A CN200710185219 A CN 200710185219A CN 100540697 C CN100540697 C CN 100540697C
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Abstract
The invention provides a kind of method of converting furnace oxygen-enriched air converting copper, principal feature is: 1, the condition of oxygen-enriched air converting: when oxygen pressure during greater than the internal layer wind pressure, the rifle position allows to adopt oxygen enrichment at blowing position, and the internal layer wind pressure is greater than oxygen pressure, stop the oxygen enrichment operation, carry out converting with air; 2, Control for Kiln Temperature: after adding oxygen-enriched air converting, because melt tank reaction speeds up, furnace temperature is gone back raw coal by reduction or two cycles adds a small amount of icy copper material speed control system furnace temperature in order to control; 3, the quality of control blister copper: treat sulfurous gas SO
2Concentration progressively descends, and the blister copper blowing stops adding icy copper when finishing soon; 4, adopt the limit to add blowing of cold burden limit and one-period employing oxygen enrichment, the two cycles later stage stops the oxygen enrichment operation, to reduce the risk of foamy slag.It has improved operating environment, has improved blowing speed, has reduced fuel consumption, has increased economic benefit.
Description
Technical field
The present invention relates to the copper smelting technology, the technological operation under a kind of specifically Australia Si Maite converting furnace excess oxygen and the method for control.
Background technology
At present, the blister copper production technique mainly adopts PS to bessemerize technology in the blowing stage, the maximum characteristics of this technology are to finish whole converting process in the body of heater of a rotation, blowing one-period slag making reaction, slag making finishes the back the slag emptying, enter the two cycles blowing, the two cycles desulphurization reaction, the qualified blister copper of final production cupric more than 98.6%, the PS converter is a periodic job, in the transport process of copper matte regulus and blowing product, cause a large amount of heat-energy losses and low vacancy pollution, exhaust gas volumn and smoke components fluctuation are big, gas washing in SA production control difficulty, and the rate of recovery of sulphur is not high.
Australia Si Maite twin furnace operating system is produced blister copper, and its melting and converting process all adopt Australia Si Maite top-submerged lance technology.Australia Si Maite blowing technology is different from PS fully and bessemerizes technology, Australia Si Maite converting furnace is the right cylinder of an inner lining refractory, hot matte enters converting furnace by chute from the inlet weir of lower furnace, icy copper, flux and reductive agent enter converting furnace by belt from the top filling mouth, Australia Si Maite spray gun vertically inserts the slag blanket in molten bath in the stove from the furnace roof gun slot, the air of blowing reaction needed is blasted the molten bath, whole converting process need be carried out under thick slag blanket condition, in 1200～1300 ℃ of high temperature molten baths, spray gun wind initial oxidation slag blanket, simultaneously under spray gun violent stirring condition, snperoxiaized slag blanket and matte carry out the exchange of oxygen, finish the oxidizing reaction of converting process.Australia Si Maite twin furnace operating system is produced blister copper and is had:
1, Australia Si Maite converting furnace advantage
Australia Si Maite converting furnace copper matte regulus is transported by chute with the blowing product, has reduced low vacancy pollution, and the rate of recovery of sulphur reaches more than 95%, has embodied than the better environment-friendly advantage of traditional PS converter.
2, Australia Si Maite converting furnace shortcoming
(1), converting furnace operation has bigger potential safety hazard, the oxidizing reaction under the blowing state is finished by the transmission of slag, spray gun wind acts directly on slag blanket, foamy slag has a big risk.
The reaction of Australia Si Maite converting furnace institute aerobic is finished by the transmission of slag, as slag Fe/SiO
2The serious change or slag Fe taken place
3O
4Content was above 20% o'clock, the fusing point of slag can raise, viscosity strengthens, slag viscosity also can strengthen when furnace temperature is lower than target value, the gas that slag viscosity causes greatly blasting slag blanket can make the slag foamed because not breaking away from the slag constraint, the slag of foamed can cause serious industrial accident, and the use of oxygen enrichment can cause the slag foamed even more serious.Owing to the existence of above reason, Australia Si Maite converting furnace considers only to adopt converting with air for process safety when initial design, simultaneously thickness of slag layer under the converting with air condition and air quantity control is had strict demand.
(2), production capacity is low, is not suitable for the large-scale industrial production needs.
The Australia Si Maite converting furnace size of capacity is at 3.5 ten thousand tons, and owing to use the converting with air pattern, the oxygen amount that participates in the blowing reaction is restricted, and the size of capacity is difficult to improve, and is not suitable for the large-scale industrial production needs.
Summary of the invention
The objective of the invention is to overcome the existing deficiency of above-mentioned existing Australia Si Maite blowing technology, can solve the existing problem of this technology, provide a kind of and boost productivity, improve operational condition, safe and reliable converting furnace oxygen-enriched air converting copper technology.
The technical scheme that the present invention is adopted for the above purpose of realization is:
A kind of method of converting furnace oxygen-enriched air converting copper, adopt the cylindrical converting furnace of an inner lining refractory, hot matte enters converting furnace by chute from the inlet weir of lower furnace, icy copper, flux and reductive agent enter converting furnace by belt from the top filling mouth, spray gun vertically inserts the slag blanket in molten bath in the stove from the furnace roof gun slot, the air of blowing reaction needed is blasted the molten bath, whole converting process need be carried out under thick slag blanket condition, in 1200～1300 ℃ of high temperature molten baths, spray gun wind initial oxidation slag blanket, simultaneously under spray gun violent stirring condition, matte generation oxidizing reaction in air and the stove, the reaction of sulphur in the matte and oxygen generates sulfurous gas and enters smoke processing system, after the iron oxidation in the matte with the flux slag making, thereby copper is purified; It is characterized in that: the air of described blowing reaction needed is purity oxygen to be mixed into the airflow pipe of spray gun, and makes Control for Oxygen Content 21～35%, and formulation has oxygen-enriched air converting processing requirement and operation steps.Described oxygen-enriched air converting processing requirement is:
(1) condition of oxygen-enriched air converting: when oxygen pressure during greater than the internal layer wind pressure, the rifle position allows to adopt oxygen enrichment at blowing position, and the internal layer wind pressure stops the oxygen enrichment operation greater than oxygen pressure, carries out converting with air;
(2) Control for Kiln Temperature: after adding oxygen-enriched air converting, because melt tank reaction speeds up, furnace temperature is gone back raw coal by reduction or two cycles adds a small amount of icy copper material speed control system furnace temperature in order to control;
(3) quality of control blister copper: treat sulfurous gas SO
2Concentration progressively descends, and the blister copper blowing stops adding icy copper when finishing soon;
(4) adopt the limit to add blowing of cold burden limit and one-period employing oxygen enrichment, the two cycles later stage stops the operating method of oxygen enrichment, and control reduces the risk of foamy slag.
Described process control parameter and operation steps under oxygen-enriched air converting processing requirement condition:
(1), the ferrosilicon ratio of slag is controlled at 1.2～1.4, purpose is in order to be controlled at Fe in the slag under the oxygen-enriched air converting state
3O
4Rapid generation, the reductive agent proportioning is controlled at 2.5～3%, Fe
3O
4Content is controlled at 15～20%, prevents the slag foamed under the oxygen-enriched air converting condition;
(2), adopt cold and hot matte optimization to intersect feeding manner into stove, icy copper adds from the furnace roof aperture, can effectively reduce to stove top peroxidation slag, prevents the slag foamed;
(3), pass through the output of spray gun back-pressure, SO 2 from fume concentration output parameter and the actual stirring situation of spray gun in stove of Controlling System, the rifle position of Comprehensive Control spray gun, after guaranteeing that spray gun is blown into slag with oxygen-rich air, slag and matte layer are in good whipped state, guarantee the oxygen exchange under hot conditions of matte and slag, prevent the peroxidation of slag, thereby prevent the slag foamed.
A kind of converting furnace oxygen-enriched air converting of the present invention copper technology has overcome the deficiencies in the prior art compared with prior art, efficiently solves the safety issue of using the blowing of oxygen enrichment blister copper for a long time, and has following significant effect and characteristics:
(1), oxygen-enriched air converting increased the processing power of stove, after adopting oxygen-enriched air converting under the condition that does not change any equipment configuration, accelerated blowing speed, single furnace output reaches 55～60t, production capacity rises to 50,000 tons/year by 3.5 ten thousand tons/year, has promoted 43%.
(2), improved the production operation environment: oxygen-enriched air converting causes always reducing with air quantity, and the melt splash obviously reduces, and combustion chamber draft is controlled easily, and fire door and spray gun middle and upper part dross obviously reduce; Improved the environmental sanitation condition, the concentration of oxygen-enriched air converting SO 2 from fume improves the recovery of being convenient to relieving haperacidity and sulphur, has showed than the better advantage of existing traditional PS converter environmental protection condition;
(3), improved the working condition of smoke processing system,, SO 2 from fume SO
2Concentration rises to 5～9% by original 5～7%;
(4), improved operational condition, oxygen-enriched air converting has reduced total air quantity of using, splash and bonding improving situation are easier to technological operation in the stove;
(5), reduced energy consumption, oxygen-enriched air converting self-heating degree height handles in a large number that the converting furnace fuel rate is reduced to 3% by 4% under the condition of icy copper, by 50,000 tons of/year calculating of output, can save 2700 tons of fire coals every year, surplus the accumulating sum 1,000,000 yuan;
Description of drawings
Fig. 1 is the process flow sheet of the method for a kind of converting furnace oxygen-enriched air converting of the present invention copper;
Embodiment
Be elaborated below in conjunction with accompanying drawing of the present invention:
The principle of a kind of converting furnace oxygen-enriched air converting of the present invention copper is: it is equal to converting with air, be blown into the air of high-temperature fusant and the matte generation oxidizing reaction in the stove by spray gun, sulphur in the matte and oxygen reaction generate sulfurous gas and enter smoke processing system, after the iron oxidation in the matte with the flux slag making, copper is purified, and finally produces the blister copper of 98.6% above grade.Oxygen-enriched air converting makes the oxidizing reaction of sulphur and iron more violent because of the raising of oxygen concentration, but brings even more serious slag foamed risk simultaneously.
As shown in Figure 1, the process flow sheet of the method for a kind of converting furnace oxygen-enriched air converting of the present invention copper.The method of a kind of converting furnace oxygen-enriched air converting of the present invention copper, adopt the cylindrical Australia Si Maite converting furnace of an inner lining refractory, hot matte enters converting furnace by chute from the inlet weir of lower furnace, icy copper, flux and reductive agent enter converting furnace by belt from the top filling mouth, spray gun vertically inserts the slag blanket in molten bath in the stove from the furnace roof gun slot, the air of blowing reaction needed is blasted the molten bath, whole converting process need be carried out under thick slag blanket condition, in 1200～1300 ℃ of high temperature molten baths, spray gun wind initial oxidation slag blanket, simultaneously under spray gun violent stirring condition, matte generation oxidizing reaction in air and the stove, the reaction of sulphur in the matte and oxygen generates sulfurous gas and enters smoke processing system, after the iron oxidation in the matte with the flux slag making, thereby copper is purified; It is characterized in that: the air of described blowing reaction needed is purity oxygen to be mixed into the airflow pipe of spray gun, and makes Control for Oxygen Content 21～35%, and formulation has oxygen-enriched air converting processing requirement and operation steps.
Described oxygen-enriched air converting processing requirement is:
(1) condition of oxygen-enriched air converting: when oxygen pressure during greater than the internal layer wind pressure, the rifle position allows to adopt oxygen enrichment at blowing position, and the internal layer wind pressure stops the oxygen enrichment operation greater than oxygen pressure, carries out converting with air;
(2) Control for Kiln Temperature: after adding oxygen-enriched air converting, because melt tank reaction speeds up, furnace temperature is gone back raw coal by reduction or two cycles adds a small amount of icy copper material speed control system furnace temperature in order to control;
(3) quality of control blister copper: treat sulfurous gas SO
2Concentration progressively descends, and the blister copper blowing stops adding icy copper when finishing soon;
(4) adopt the limit to add blowing of cold burden limit and one-period employing oxygen enrichment, the two cycles later stage stops the operating method of oxygen enrichment, and control reduces the risk of foamy slag.
Process control parameter under oxygen-enriched air converting processing requirement condition:
(1), the ferrosilicon ratio of slag is controlled at 1.2～1.4, purpose is in order to be controlled at Fe in the slag under the oxygen-enriched air converting state
3O
4Rapid generation, the reductive agent proportioning is controlled at 2.5～3%, Fe
3O
4Content is controlled at 15～20%, prevents the slag foamed under the oxygen-enriched air converting condition;
(2), adopt cold and hot matte optimization to intersect feeding manner into stove, icy copper adds from the furnace roof aperture, can effectively reduce to stove top peroxidation slag, prevents the slag foamed;
(3), the output of the spray gun back-pressure of Controlling System and SO 2 from fume concentration output parameter and the actual stirring situation of spray gun in stove, after guaranteeing that spray gun is blown into slag with oxygen-rich air, slag and matte layer are in good whipped state, guarantee the oxygen exchange under hot conditions of matte and slag, prevent the peroxidation of slag, thereby prevent the slag foamed.
Concrete operations step under oxygen-enriched air converting processing requirement condition:
(1), blowing one-period operation: start spray gun, the rifle position begins converting with air in time below 1.8 meters, starts feed system simultaneously, adopts from chute to advance hot matte and advance the intersection feeding manner of icy copper from belt; Set oxygen enrichment degree and total blast volume value according to charge calculation in Controlling System, start oxygen-enriched air converting, Controlling System is calculated the amount of oxygen proportioning automatically according to oxygen enrichment degree and total blast volume set(ting)value during oxygen-enriched air converting.Require to allocate into suitable flux and reductive agent proportioning according to technology controlling and process in the oxygen-enriched air converting process, form to guarantee rational furnace temperature and slag; The rifle position is according to comprehensive condition adjustment such as melt thickness in spray gun back-pressure and SO 2 from fume concentration and the stove; The one-period technology controlling and process requires: Control for Kiln Temperature is at 1200～1250 ℃, cold and hot matte material speed 30～40T/h, and slag Fe/SiO2 is controlled at 1.2～1.4%, and the reductive agent proportioning is controlled at 1.5～2.5%, sulfur dioxide in flue gas SO
2Concentration is controlled at 5～8%, because the increase of inlet amount, blowing one-period position of lances is in continuous lifting;
(2), blowing two cycles operation: stop to add hot matte after entering the blowing two cycles, according to the icy copper of an amount of adding of furnace temperature rising situation, suitably adjust oxygen enrichment degree, reductive agent proportioning according to stove inner foam situation, suitably adjust position of lances according to SO 2 from fume concentration situation; When SO 2 from fume concentration continues to descend, adopt the copper sample and judge the blister copper terminal point, the blister copper terminal point begins to promote spray gun when accurate, spray gun promotes and surpasses the 1800mm position, oxygen system will be closed automatically, the air quantity of air system is reduced to the minimum air quantity that the spray gun cooling needs automatically, and so far converting process finishes; The two cycles technology controlling and process requires: Control for Kiln Temperature is expected speed 3～5T/h, slag Fe/SiO at 1250～1300 ℃ in the icy copper
2Be controlled at 1.2～1.4, the reductive agent proportioning is controlled at 2～3%, sulfur dioxide in flue gas SO
2Concentration is controlled at 7～9%, and two cycles is owing to the continuous reduction of metal covering, and position of lances will constantly descend;
(3), in one-period and two cycles converting process, if emergency situation can change converting with air over to or stop the blowing state at any time in the operation of Controlling System termination oxygen-enriched air converting.
Normally carry out for guaranteeing the oxygen-enriched air converting operational safety, should the strict method of carrying out a kind of converting furnace oxygen-enriched air converting of the present invention copper, and each monitoring parameter of Controlling System of in charging, converting process, looking over one's shoulder, in addition, be carved with the people in the time of must keeping on the converting furnace service platform in the operating process and patrol and examine the working of a furnace, whether the observation spray gun rocks with furnace temperature normal, guarantees that charging opening is unimpeded, to prevent the generation of various accidents.
Claims (3)
1, a kind of method of converting furnace oxygen-enriched air converting copper, adopt the cylindrical converting furnace of an inner lining refractory, hot matte enters converting furnace by chute from the inlet weir of lower furnace, icy copper, flux and reductive agent enter converting furnace by belt from the top filling mouth, spray gun vertically inserts the slag blanket in molten bath in the stove from the furnace roof gun slot, the air of blowing reaction needed is blasted the molten bath, whole converting process need be carried out under thick slag blanket condition, in 1200～1300 ℃ of high temperature molten baths, spray gun wind initial oxidation slag blanket, simultaneously under spray gun violent stirring condition, matte generation oxidizing reaction in air and the stove, the reaction of sulphur in the matte and oxygen generates sulfurous gas and enters smoke processing system, after the iron oxidation in the matte with the flux slag making, thereby copper is purified; It is characterized in that: oxygen mix to the airflow pipe of spray gun, is controlled at 21～35% with the atmospheric oxygen content of blowing reaction needed, and described this oxygen-enriched air converting processing requirement is:
(1) condition of oxygen-enriched air converting: when oxygen pressure during greater than the internal layer wind pressure, the rifle position allows to adopt oxygen enrichment at blowing position, and the internal layer wind pressure stops the oxygen enrichment operation greater than oxygen pressure, carries out converting with air;
(2) Control for Kiln Temperature: go back raw coal and icy copper material speed control system furnace temperature by control;
(3) quality of control blister copper: by flue gas SO
2The quality of change in concentration control blister copper;
(4) adopt the limit to add blowing of cold burden limit and one-period employing oxygen enrichment, the two cycles later stage stops the operating method of oxygen enrichment, and control reduces the risk of foamy slag.
2, the method for a kind of converting furnace oxygen-enriched air converting copper according to claim 1 is characterized in that: described process control parameter under oxygen-enriched air converting processing requirement condition:
(1), the ferrosilicon ratio of slag is controlled at 1.2～1.4, the reductive agent proportioning is controlled at 2.5～3%, Fe
3O
4Content is controlled at 15～20%;
(2), adopt cold and hot matte optimization to intersect feeding manner into stove, icy copper adds from the furnace roof aperture;
(3), spray gun back-pressure output parameter and SO 2 from fume concentration output parameter and the actual stirring situation of spray gun in stove by Controlling System, the rifle position of Comprehensive Control spray gun.
3, the method for a kind of converting furnace oxygen-enriched air converting copper according to claim 1 is characterized in that: described concrete operations step under oxygen-enriched air converting processing requirement condition:
(1), blowing one-period operation: start spray gun, the rifle position begins converting with air in time below 1.8 meters, starts feed system simultaneously, adopts from chute to advance hot matte and advance the intersection feeding manner of icy copper from belt; Set oxygen enrichment degree and total blast volume value according to charge calculation in Controlling System, start oxygen-enriched air converting, Controlling System is calculated the amount of oxygen proportioning automatically according to oxygen enrichment degree and total blast volume set(ting)value during oxygen-enriched air converting; Require to allocate into suitable flux and reductive agent proportioning according to technology controlling and process in the oxygen-enriched air converting process, form to guarantee rational furnace temperature and slag; The rifle position is according to spray gun back-pressure and SO 2 from fume concentration and the adjustment of spray gun stirring information summary; The one-period technology controlling and process requires: Control for Kiln Temperature is at 1200～1250 ℃, cold and hot matte material speed 30～40T/h, slag Fe/SiO
2Be controlled at 1.2～1.4%, the reductive agent proportioning is controlled at 1.5～2.5%, sulfur dioxide in flue gas SO
2Concentration is controlled at 5～8%, because the increase of inlet amount, blowing one-period position of lances is in continuous lifting;
(2), blowing two cycles operation: stop to add hot matte after entering the blowing two cycles, according to the icy copper of an amount of adding of furnace temperature rising situation, suitably adjust oxygen enrichment degree, reductive agent proportioning according to stove inner foam situation, suitably adjust position of lances according to SO 2 from fume concentration situation; When SO 2 from fume concentration continues to descend, adopt the copper sample and judge the blister copper terminal point, the blister copper terminal point begins to promote spray gun when accurate, spray gun promotes and surpasses the 1800mm position, and oxygen system is closed automatically, the air quantity of air system is reduced to the minimum air quantity that the spray gun cooling needs automatically, and so far converting process finishes; The two cycles technology controlling and process requires: Control for Kiln Temperature is expected speed 3～5T/h, slag Fe/SiO at 1250～1300 ℃ in the icy copper
2Be controlled at 1.2～1.4, the reductive agent proportioning is controlled at 2～3%, sulfur dioxide in flue gas SO
2Concentration is controlled at 7～9%, and two cycles is owing to the continuous reduction of metal covering, and position of lances constantly descends;
(3), in one-period and two cycles converting process, if emergency situation can change converting with air over to or stop the blowing state at any time in the operation of Controlling System termination oxygen-enriched air converting.
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| CN102952952B (en) * | 2012-09-26 | 2014-08-20 | 东北大学 | Method for directly restoring and recovering copper iron from smelting copper slag |
| CN103695661B (en) * | 2013-12-10 | 2015-03-18 | 赤峰富邦铜业有限责任公司 | Operation method for manufacturing high-iron low-silicon slag through copper oxygen enrichment double side blow smelting furnace |
| CN103882244B (en) * | 2014-04-09 | 2015-09-02 | 重庆广播电视大学 | Oxygen-enriched air converting devices and methods therefor |
| CN104561589A (en) * | 2014-12-12 | 2015-04-29 | 金川集团股份有限公司 | Method for blowing matte through copper converter |
| CN104894391B (en) * | 2015-06-10 | 2017-02-08 | 赤峰富邦铜业有限责任公司 | Cold metal blowing-in operation method of oxygen-enriched side-blown bath copper smelting process |
| CN104928474B (en) * | 2015-07-08 | 2017-03-01 | 吉林吉恩镍业股份有限公司 | A kind of method extending Ausmelt furnace spray gun service life |
| CN107227410A (en) * | 2017-06-14 | 2017-10-03 | 中国恩菲工程技术有限公司 | Short route copper metallurgy system |
| CN107326195A (en) * | 2017-06-14 | 2017-11-07 | 中国恩菲工程技术有限公司 | Short route copper smelting method |
| CN108624764A (en) * | 2018-05-14 | 2018-10-09 | 山东方泰循环金业股份有限公司 | A kind of continuous oxygen-enriched air converting technique of matte |
| CN110607459B (en) * | 2019-09-20 | 2021-05-28 | 北方铜业股份有限公司 | Method for converting high-grade matte by using horizontal converter |
| CN114217592B (en) * | 2021-12-17 | 2024-06-28 | 北京瑞太智联技术有限公司 | Control system and method for copper top-blowing production process |
| CN114015894B (en) * | 2022-01-05 | 2022-04-01 | 矿冶科技集团有限公司 | Full-thermal-state copper matte converting method |
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Effective date of registration: 20190528 Address after: 043700 Dongfeng Mountain, Yuanqu County, Yuncheng City, Shanxi Province Patentee after: Northern Copper Industrial Co Address before: 043700 Technical Center of Zhongtiaoshan Nonferrous Metals Group Co., Ltd. in Yuanqu County, Shanxi Province Patentee before: Zhongtiaoshan Nonferrous Metals Co., Ltd. |
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Address after: 043700 Dongfeng mountain, Xincheng Town, Yuanqu County, Yuncheng City, Shanxi Province Patentee after: Shanxi North Copper Co.,Ltd. Address before: 043700 Dongfeng Mountain, Yuanqu County, Yuncheng City, Shanxi Province Patentee before: Northern Copper Industrial Co. |
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