CN105463187A - Oxygen enrichment roasting technology of laterite-nickel ore - Google Patents
Oxygen enrichment roasting technology of laterite-nickel ore Download PDFInfo
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- CN105463187A CN105463187A CN201510884453.XA CN201510884453A CN105463187A CN 105463187 A CN105463187 A CN 105463187A CN 201510884453 A CN201510884453 A CN 201510884453A CN 105463187 A CN105463187 A CN 105463187A
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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 the field of laterite-nickel ore pyrogenic process smelting, and particularly relates to an oxygen enrichment roasting technology of laterite-nickel ore to solve the technical problems that the machining cost of smelting ferronickel through laterite-nickel ore is high, the workload of processing kiln lining crusts of a rotary kiln is large, and the production efficiency is reduced. According to the scheme solving the technical problems, the oxygen enrichment roasting technology of laterite-nickel ore is provided and comprises the following steps that a, laterite-nickel ore and pulverized coal are added in the rotary kin, and oxygen is introduced in the rotary kiln for roasting; b, when the kiln lining crusts of the rotary kiln reach 200-250 mm, oxygen stops being introduced, and when the temperature of the rotary kiln is reduced by 50 DEG C, oxygen is introduced again, and the temperature of the rotary kiln is rapidly increased to be higher than the kiln temperature during roasting by 45-55 DEG C; and c, the operation of the step b is repeated till the thickness of the lining crusts of the rotary kiln is smaller than 50 mm. According to the oxygen enrichment roasting technology of laterite-nickel ore, running of the rotary kiln is guaranteed, the usage amount of natural gas is reduced, and the production cost is reduced.
Description
Technical field
The invention belongs to red soil nickel ore pyrometallurgical smelting field, be specifically related to the oxygen-enriched air roasting technique of red soil nickel ore.
Background technology
RKEF technique is the method for a kind of laterite smelting ferronickel the most ripe.This technique adopts rotary kiln baking, then enters electrosmelting.The object of rotary kiln baking is the crystal water and the hydroxyl that remove laterite, improves the temperature of feed stock for blast furnace simultaneously, reduces melting electric consumption, saves production cost.The heat of rotary kiln baking process is produced by coal dust and air generation combustion reactions.There will be the situation of pulverized coal flame instability in production process, so be provided with natural gas transport passage at burner, adopt the burning of Sweet natural gas to carry out stable burning flame, thus stablize the direct motion of rotary kiln.
But the price of Sweet natural gas is higher, increases natural gas consumption and can improve the baking expense of red soil nickel ore.Therefore, in order to reduce the tooling cost of smelting ferronickel from red soil nickel ore, need the use reducing, even stop Sweet natural gas.
The situation of kiln lining skinning can occur in the process of rotary kiln baking red soil nickel ore in addition, when skinning reaches certain thickness, need to stop kiln and carry out manual handling, this treatment process not only workload is large, and reduces production efficiency.
In sum, a kind of method improving roasting lateritic nickel ore of exploitation is needed badly.
Summary of the invention
The technical problem to be solved in the present invention is that the tooling cost of smelting ferronickel from red soil nickel ore is higher, and the workload of the kiln lining skinning of process rotary kiln is large, and reduces production efficiency.
Invent the oxygen-enriched air roasting technique that the scheme solved the problems of the technologies described above is to provide a kind of red soil nickel ore, comprise the following steps:
A, red soil nickel ore and coal dust are joined in rotary kiln, in rotary kiln, pass into oxygen carry out roasting;
B, when the furnace lining skinning of rotary kiln reaches 200 ~ 250mm, stop pass into oxygen, when kiln temperature have dropped 50 DEG C, again pass into oxygen, make rotary kiln be rapidly heated to higher than furnace temperature during roasting 45 ~ 55 DEG C;
The operation passing into oxygen and again pass into oxygen is stopped, until the thickness of inner liner of rotary kiln skinning is less than 50mm in c, repeating step b.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, the mass ratio of red soil nickel ore described in step a and coal dust is 100 ︰ 4 ~ 7.Wherein, the mineral of red soil nickel ore still containing 20% surface water after being drying, the fixed carbon of coal dust is 65 ~ 75%.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, described in step a, the feed postition of coal dust sprays into.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, the purity of oxygen described in step a is 90% ~ 95%.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, the intake of oxygen described in step a makes the mass percentage of oxygen in the air in rotary kiln reach 23 ~ 25%.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, the temperature of roasting described in step a is 700 ~ 900 DEG C.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, the speed be rapidly heated described in step b is 10 ~ 15 DEG C/min.
The oxygen-enriched air roasting technique of red soil nickel ore provided by the invention, simple to operate, flexible, stable combustion flame can be provided, and utilize temperature head to remove the liner skinning of rotary kiln, ensure that the direct motion of rotary kiln, decrease Natural gas consumption, reduce production cost.
Embodiment
The oxygen-enriched air roasting technique of red soil nickel ore, comprises the following steps:
A, red soil nickel ore and coal dust are joined in rotary kiln, in rotary kiln, pass into oxygen carry out roasting;
B, when the furnace lining skinning of rotary kiln reaches 200 ~ 250mm, stop pass into oxygen, when kiln temperature have dropped 50 DEG C, again pass into oxygen, make rotary kiln be rapidly heated to higher than furnace temperature during roasting 45 ~ 55 DEG C;
The operation passing into oxygen and again pass into oxygen is stopped, until the thickness of inner liner of rotary kiln skinning is less than 50mm in c, repeating step b.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, the mass ratio of red soil nickel ore described in step a and coal dust is 100 ︰ 4 ~ 7.Wherein, the mineral of red soil nickel ore still containing 20% surface water after being drying, the fixed carbon of coal dust is about 65 ~ 75%.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, described in step a, the feed postition of coal dust sprays into.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, the purity of oxygen described in step a is 90% ~ 95%.The oxygen purity passed into is higher, and the total exhaust gas volumn in rotary kiln less, the heat to be taken away by flue gas is fewer, but the higher oxygen cost of oxygen concentration increases simultaneously, and under considering, purity unit roasting cost in 90% ~ 95% scope of oxygen is minimum.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, the intake of oxygen described in step a makes the mass percentage of oxygen in the air in rotary kiln reach 23 ~ 25%.If oxygen content concentration is higher in rotary kiln, in kiln, total exhaust gas volumn is fewer, and the calorific loss that kiln exit gas is taken away is less; But oxygen concentration is too high simultaneously, coal dust is comparatively abundant at partial combustion, easily causes the too high calcining of local temperature thus in molten state, easily occurs a difficult problem for furnace lining skinning, ring formation on the contrary; Moreover oxygen concentration is high, coal dust burns at the first half of stove, causes first half heat oversupply, the latter half of shortage of heat of stove, and the heat distribution of whole stove can not meet manufacturing technique requirent.Consider, under existing equipment, processing condition, the optimum range of oxygen concentration is 23 ~ 25%.
In above-mentioned oxygen-enriched air roasting technique, the temperature of roasting described in step a is 700 ~ 900 DEG C.
In the oxygen-enriched air roasting technique of above-mentioned red soil nickel ore, the speed be rapidly heated described in step b is 10 ~ 15 DEG C/min.Temperature increase is faster, and furnace lining skinning removal effect is better, but too fast temperature variation also has impact to fire proof material of furnace lining work-ing life, and through long production practice, rate temperature change can be controlled in 10 ~ 15 DEG C/min.The furnace temperature during roasting of outlet temperature control ratio is high about 50 DEG C.
Embodiment 1
Add red soil nickel ore 45t/h in rotary kiln, spray into coal dust 2.5t/h, when content of oxygen in air is 24% in rotary kiln, can not use Sweet natural gas completely, pulverized coal flame is stablized, and average drop temperature improves 10 DEG C.
Embodiment 2
When a, normal roasting, rotary kiln feeding is 45t/h, injecting coal quantity 2.5t/h, and in rotary kiln, content of oxygen in air is 24%.
B, reach 200mm when the skinning in furnace lining, stop passing into oxygen, make kiln temperature decline 50 DEG C, again pass into oxygen, make rotary kiln be warming up to compared with normal maturing temperature at 5 minutes high 50 DEG C.
Stop the operation 3 times passing into oxygen and again pass into oxygen in c, repeating step b, effectively can remove skinning.
Before using method provided by the invention, produce and must carry out a manual handling skinning in 15 days.After use method provided by the invention, no longer need to carry out manual handling.
The oxygen-enriched air roasting technique of red soil nickel ore provided by the invention, simple to operate, flexible, ensure that the direct motion of rotary kiln, decrease Natural gas consumption, reduce production cost.
Claims (9)
1. the oxygen-enriched air roasting technique of red soil nickel ore, comprises the following steps:
A, red soil nickel ore and coal dust are joined in rotary kiln, in rotary kiln, pass into oxygen carry out roasting;
B, when the furnace lining skinning of rotary kiln reaches 200 ~ 250mm, stop pass into oxygen, when kiln temperature have dropped 50 DEG C, again pass into oxygen, make rotary kiln be rapidly heated to higher than furnace temperature during roasting 45 ~ 55 DEG C;
The operation passing into oxygen and again pass into oxygen is stopped, until the thickness of inner liner of rotary kiln skinning is less than 50mm in c, repeating step b.
2. the oxygen-enriched air roasting technique of red soil nickel ore according to claim 1, is characterized in that: the mass ratio of red soil nickel ore described in step a and coal dust is 100 ︰ 4 ~ 7.
3. the oxygen-enriched air roasting technique of red soil nickel ore according to claim 1, is characterized in that: the mineral of the red soil nickel ore described in step a still containing 20% surface water after being drying.
4. the oxygen-enriched air roasting technique of red soil nickel ore according to claim 1, is characterized in that: the fixed carbon of coal dust described in step a is 65 ~ 75%.
5. the oxygen-enriched air roasting technique of red soil nickel ore according to claim 1, is characterized in that: described in step a, the feed postition of coal dust sprays into.
6. the oxygen-enriched air roasting technique of red soil nickel ore according to claim 1, is characterized in that: the temperature of roasting described in step a is 700 ~ 900 DEG C.
7. the oxygen-enriched air roasting technique of red soil nickel ore according to claim 1, is characterized in that: the purity of oxygen described in step a is 90% ~ 95%.
8. the oxygen-enriched air roasting technique of red soil nickel ore according to claim 1, is characterized in that: the intake of oxygen described in step a makes the mass percentage of oxygen in the air in rotary kiln reach 23 ~ 25%.
9. the oxygen-enriched air roasting technique of red soil nickel ore according to claim 1, is characterized in that: the speed be rapidly heated described in step b is 10 ~ 15 DEG C/min.
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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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113249566A (en) * | 2021-03-03 | 2021-08-13 | 广西北港新材料有限公司 | Sintering system and method for limonite type laterite-nickel ore |
| CN114136112A (en) * | 2021-12-30 | 2022-03-04 | 安徽华塑股份有限公司 | Rotary kiln crust removing 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 |
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2015
- 2015-12-04 CN CN201510884453.XA patent/CN105463187B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
Non-Patent Citations (2)
| Title |
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| 孙洪刚: ""镍铁回转窑的优化控制研究"", 《济南大学硕士学位论文》 * |
| 李建华: "回转窑结圈原因分析及预防措施", 《2010年全国炼铁生产技术会议暨炼铁学术年会》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113249566A (en) * | 2021-03-03 | 2021-08-13 | 广西北港新材料有限公司 | Sintering system and method for limonite type laterite-nickel ore |
| CN114136112A (en) * | 2021-12-30 | 2022-03-04 | 安徽华塑股份有限公司 | Rotary kiln crust removing process |
| CN114136112B (en) * | 2021-12-30 | 2023-08-15 | 安徽华塑股份有限公司 | Rotary kiln crust removal process |
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