CN105463187B - The oxygen-enriched air roasting technique of lateritic nickel ore - Google Patents
The oxygen-enriched air roasting technique of lateritic nickel ore Download PDFInfo
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- CN105463187B CN105463187B CN201510884453.XA CN201510884453A CN105463187B CN 105463187 B CN105463187 B CN 105463187B CN 201510884453 A CN201510884453 A CN 201510884453A CN 105463187 B CN105463187 B CN 105463187B
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- oxygen
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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Abstract
The invention belongs to lateritic nickel ore pyrometallurgical smelting field, and in particular to the oxygen-enriched air roasting technique of lateritic nickel ore.The technical problem to be solved in the present invention is that the processing cost of smelting ferronickel from red soil nickel ore is higher, and the workload for processing the kiln lining skinning of rotary kiln is big, and reduces production efficiency.The scheme of invention solution above-mentioned technical problem is to provide a kind of oxygen-enriched air roasting technique of lateritic nickel ore, comprises the following steps：A, lateritic nickel ore and coal dust are added in rotary kiln, are calcined to oxygen is passed through in rotary kiln；B, when the furnace lining skinning of rotary kiln reaches 200~250mm, stopping be passed through oxygen, when kiln temperature have dropped 50 DEG C, oxygen is passed through again, make rotary kiln be rapidly heated to than roasting when furnace temperature it is high 45~55 DEG C；The operation of c, repeat step b, until the thickness of inner liner of rotary kiln skinning is less than 50mm.The oxygen-enriched air roasting technique of the lateritic nickel ore that the present invention is provided ensure that the direct motion of rotary kiln, reduce Natural gas consumption, reduce production cost.
Description
Technical field
The invention belongs to lateritic nickel ore pyrometallurgical smelting field, and in particular to the oxygen-enriched air roasting technique of lateritic nickel ore.
Background technology
RKEF techniques are a kind of methods of laterite smelting ferronickel the most ripe.The technique uses rotary kiln baking, so
Laggard electric furnace smelting.The purpose of rotary kiln baking is the crystallization water and hydroxyl for removing laterite, while improving feed stock for blast furnace
Temperature, reduces melting electric consumption, saves production cost.The heat of rotary kiln baking process is that burning occurs instead by coal dust and air
Answer and produce.The unstable situation of pulverized coal flame occurs in production process, then natural gas is provided with burner
Transfer passage, combustion flame is stablized using the burning of natural gas, so as to stablize the direct motion of rotary kiln.
But the price of natural gas is higher, increasing natural gas consumption can improve the baking expense of lateritic nickel ore.Therefore,
In order to reduce the processing cost of smelting ferronickel from red soil nickel ore, it is desirable to reduce, even stop natural gas use.
The situation of kiln lining skinning can occur during other rotary kiln baking lateritic nickel ore, when skinning reaches certain thickness
When, it is necessary to stopping kiln carries out artificial treatment, not only workload is big for this processing method, and reduces production efficiency.
In sum, a kind of method for improving roasting lateritic nickel ore of exploitation is needed badly.
The content of the invention
The technical problem to be solved in the present invention is that the processing cost of smelting ferronickel from red soil nickel ore is higher, processes the kiln of rotary kiln
The workload for serving as a contrast skinning is big, and reduces production efficiency.
The scheme of invention solution above-mentioned technical problem is to provide a kind of oxygen-enriched air roasting technique of lateritic nickel ore, including following step
Suddenly：
A, lateritic nickel ore and coal dust are added in rotary kiln, are calcined to oxygen is passed through in rotary kiln；
B, when the furnace lining skinning of rotary kiln reaches 200~250mm, stopping be passed through oxygen, treat that kiln temperature have dropped
At 50 DEG C, oxygen is passed through again, the furnace temperature for making rotary kiln be rapidly heated during to than roasting is high 45~55 DEG C；
Stop being passed through oxygen and being passed through the operation of oxygen again in c, repeat step b, until the thickness of inner liner of rotary kiln skinning
Degree is less than 50mm.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the mass ratio of lateritic nickel ore and coal dust described in step a be 100 ︰ 4~
7.Wherein, lateritic nickel ore is that the fixed carbon of coal dust is 65~75% still containing the mineral of 20% surface water after drying.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the feed postition of coal dust described in step a is to spray into.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the purity of oxygen described in step a is 90%~95%.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the intake of oxygen described in step a is to make the air in rotary kiln
The weight/mass percentage composition of middle oxygen reaches 23~25%.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the temperature being calcined described in step a is 700~900 DEG C.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the speed being rapidly heated described in step b is 10~15 DEG C/min.
The oxygen-enriched air roasting technique of the lateritic nickel ore that the present invention is provided, it is simple to operate, flexible, the burning fire of stabilization can be provided
Flame, and the liner skinning of rotary kiln is removed using temperature difference, it is ensured that the direct motion of rotary kiln, Natural gas consumption is reduced, drop
Low production cost.
Specific embodiment
The oxygen-enriched air roasting technique of lateritic nickel ore, comprises the following steps：
A, lateritic nickel ore and coal dust are added in rotary kiln, are calcined to oxygen is passed through in rotary kiln；
B, when the furnace lining skinning of rotary kiln reaches 200~250mm, stopping be passed through oxygen, treat that kiln temperature have dropped
At 50 DEG C, oxygen is passed through again, the furnace temperature for making rotary kiln be rapidly heated during to than roasting is high 45~55 DEG C；
Stop being passed through oxygen and being passed through the operation of oxygen again in c, repeat step b, until the thickness of inner liner of rotary kiln skinning
Degree is less than 50mm.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the mass ratio of lateritic nickel ore and coal dust described in step a be 100 ︰ 4~
7.Wherein, lateritic nickel ore is that the fixed carbon of coal dust is 65~75% or so still containing the mineral of 20% surface water after drying.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the feed postition of coal dust described in step a is to spray into.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the purity of oxygen described in step a is 90%~95%.The oxygen being passed through
Gas purity is higher, and the heat that the total exhaust gas volumn in rotary kiln is taken away less, by flue gas is fewer, but oxygen concentration oxygen processed higher simultaneously
Cost increases, and under considering, the purity of the oxygen unit roasting cost in the range of 90%~95% is minimum.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the intake of oxygen described in step a is to make the air in rotary kiln
The weight/mass percentage composition of middle oxygen reaches 23~25%.If oxygen content concentration is higher in rotary kiln, total exhaust gas volumn is got in kiln
Few, the thermal loss that kiln exit gas are taken away is just smaller；But oxygen concentration is too high simultaneously, coal dust is more abundant in partial combustion, easily leads
It is thus in molten state to cause the too high calcining of local temperature, easily occurs the problem of furnace lining skinning, ring formation on the contrary；Furthermore, oxygen concentration is high,
Coal dust burns in the first half of stove, causes first half heat supply superfluous, the latter half of shortage of heat of stove, whole stove
The heat distribution of kiln can not meet manufacturing technique requirent.Consider, under existing equipment, process conditions, oxygen concentration
Optimum range is 23~25%.
In above-mentioned oxygen-enriched air roasting technique, the temperature being calcined described in step a is 700~900 DEG C.
In the oxygen-enriched air roasting technique of above-mentioned lateritic nickel ore, the speed being rapidly heated described in step b is 10~15 DEG C/min.Temperature
Degree lifting is faster, and the better but too fast temperature change of furnace lining skinning removal effect also has shadow to fire proof material of furnace lining service life
Ring, through prolonged production practices, rate temperature change can be controlled in 10~15 DEG C/min.When final temperature control ratio is calcined
50 DEG C high or so of furnace temperature.
Embodiment 1
Lateritic nickel ore 45t/h is added in rotary kiln, coal dust 2.5t/h is sprayed into, content of oxygen in air is 24% in rotary kiln
When, natural gas, pulverized coal flame stabilization, average drop temperature can not be used to improve 10 DEG C completely.
Embodiment 2
A, when being normally calcined, rotary kiln feeding is 45t/h, injecting coal quantity 2.5t/h, content of oxygen in air in rotary kiln
It is 24%.
B, when the skinning in furnace lining reaches 200mm, stopping is passed through oxygen so that kiln temperature declines 50 DEG C, is passed through again
Oxygen, makes rotary kiln that more normal sintering temperature was warming up at 5 minutes high 50 DEG C.
Stop being passed through oxygen in c, repeat step b and be passed through the operation 3 times of oxygen again, can effectively remove skinning.
Using before the method that the present invention is provided, production must carry out an artificial treatment skinning in 15 days.Using the present invention
After the method for offer, it is no longer necessary to carry out artificial treatment.
The oxygen-enriched air roasting technique of the lateritic nickel ore that the present invention is provided, it is simple to operate, flexible, it is ensured that the direct motion of rotary kiln,
Natural gas consumption is reduced, production cost is reduced.
Claims (8)
1. the oxygen-enriched air roasting technique of lateritic nickel ore, comprises the following steps：
A, lateritic nickel ore and coal dust are added in rotary kiln, are calcined to oxygen is passed through in rotary kiln；
B, when the furnace lining skinning of rotary kiln reaches 200~250mm, stopping be passed through oxygen, treat that kiln temperature have dropped 50 DEG C
When, oxygen is passed through again, the furnace temperature for making rotary kiln be rapidly heated during to than roasting is high 45~55 DEG C；The speed being rapidly heated
It is 10~15 DEG C/min；
Stop being passed through oxygen and being passed through the operation of oxygen again in c, repeat step b, until the thickness of inner liner of rotary kiln skinning is small
In 50mm.
2. the oxygen-enriched air roasting technique of lateritic nickel ore according to claim 1, it is characterised in that：Lateritic nickel ore described in step a
It is 100 ︰ 4~7 with the mass ratio of coal dust.
3. the oxygen-enriched air roasting technique of lateritic nickel ore according to claim 1, it is characterised in that：Laterite nickel described in step a
Ore deposit is still to contain the mineral of 20% surface water after drying.
4. the oxygen-enriched air roasting technique of lateritic nickel ore according to claim 1, it is characterised in that：Coal dust consolidates described in step a
It is 65~75% to determine carbon.
5. the oxygen-enriched air roasting technique of lateritic nickel ore according to claim 1, it is characterised in that：Coal dust described in step a plus
It is to spray into enter mode.
6. the oxygen-enriched air roasting technique of lateritic nickel ore according to claim 1, it is characterised in that：The temperature being calcined described in step a
Spend is 700~900 DEG C.
7. the oxygen-enriched air roasting technique of lateritic nickel ore according to claim 1, it is characterised in that：Oxygen is pure described in step a
Spend is 90%~95%.
8. the oxygen-enriched air roasting technique of lateritic nickel ore according to claim 1, it is characterised in that：Oxygen described in step a it is logical
It is that the weight/mass percentage composition for making oxygen in the air in rotary kiln reaches 23~25% to enter amount.
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| CN201510884453.XA CN105463187B (en) | 2015-12-04 | 2015-12-04 | The oxygen-enriched air roasting technique of lateritic nickel ore |
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| CN201510884453.XA CN105463187B (en) | 2015-12-04 | 2015-12-04 | The oxygen-enriched air roasting technique of lateritic nickel ore |
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| CN105463187A CN105463187A (en) | 2016-04-06 |
| CN105463187B true CN105463187B (en) | 2017-07-04 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113249566B (en) * | 2021-03-03 | 2023-02-07 | 广西北港新材料有限公司 | Sintering system and method for limonite type laterite-nickel ore |
| CN114136112B (en) * | 2021-12-30 | 2023-08-15 | 安徽华塑股份有限公司 | Rotary kiln crust removal process |
Citations (4)
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|---|---|---|---|---|
| CN101942558A (en) * | 2010-09-10 | 2011-01-12 | 平安鑫海资源开发有限公司 | Method for drying and reducing low-grade laterite-nickel ore by using bituminous coal |
| CN102268535A (en) * | 2011-08-02 | 2011-12-07 | 长沙矿冶研究院有限责任公司 | Reduction and magnetic roasting process for low-grade metal minerals in rotary kiln |
| CN102660672A (en) * | 2012-04-28 | 2012-09-12 | 刘光火 | Process for smelting low-grade laterite |
| CN103276194A (en) * | 2013-05-06 | 2013-09-04 | 酒泉钢铁(集团)有限责任公司 | Ring formation resistant magnetizing roasting process for difficultly separated iron ore rotary kiln |
-
2015
- 2015-12-04 CN CN201510884453.XA patent/CN105463187B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942558A (en) * | 2010-09-10 | 2011-01-12 | 平安鑫海资源开发有限公司 | Method for drying and reducing low-grade laterite-nickel ore by using bituminous coal |
| CN102268535A (en) * | 2011-08-02 | 2011-12-07 | 长沙矿冶研究院有限责任公司 | Reduction and magnetic roasting process for low-grade metal minerals in rotary kiln |
| CN102660672A (en) * | 2012-04-28 | 2012-09-12 | 刘光火 | Process for smelting low-grade laterite |
| CN103276194A (en) * | 2013-05-06 | 2013-09-04 | 酒泉钢铁(集团)有限责任公司 | Ring formation resistant magnetizing roasting process for difficultly separated iron ore rotary kiln |
Non-Patent Citations (2)
| Title |
|---|
| "镍铁回转窑的优化控制研究";孙洪刚;《济南大学硕士学位论文》;20131129;全文 * |
| 回转窑结圈原因分析及预防措施;李建华;《2010年全国炼铁生产技术会议暨炼铁学术年会》;20090526;全文 * |
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