CN106702177B - The technique of direct reduction of laterite nickel mine with rotary kiln ferronickel particle - Google Patents
The technique of direct reduction of laterite nickel mine with rotary kiln ferronickel particle Download PDFInfo
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- CN106702177B CN106702177B CN201710048798.0A CN201710048798A CN106702177B CN 106702177 B CN106702177 B CN 106702177B CN 201710048798 A CN201710048798 A CN 201710048798A CN 106702177 B CN106702177 B CN 106702177B
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- rotary kiln
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- reduction
- kilneye
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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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry processes
- C22B23/023—Obtaining nickel or cobalt by dry processes with formation of ferro-nickel or ferro-cobalt
-
- 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
-
- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
-
- 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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry processes
- C22B23/021—Obtaining nickel or cobalt by dry processes by reduction in solid state, e.g. by segregation processes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a kind of techniques of direct reduction of laterite nickel mine with rotary kiln ferronickel particle, after mixing lateritic nickel ore with carbonaceous reducing agent, lime stone in ball press upper pressing ball mixing pelletizing is made in it, pelletizing preheated section of progress material sintering and removal of the crystallization water in rotary kiln are mixed, firing section is entered after the reduction that nickel element occurs for changeover portion, ferro element, the reduction of nickel element and growing up for metallic particles occurs.Wherein, it is controlled in the range of making material keep solid-state close to the temperature of the firing section of changeover portion, while guaranteeing metal reduction temperature, it can prevent formation rings in a kiln, it is controlled in the range of making material keep semi-molten state positioned at the temperature of the firing section of kilneye, since the kilneye of rotary kiln is throat structure, heat does not allow the reduction and enrichment easy to lose for being conducive to metal, there is a small amount of ring formation when even if individual, under the rolling effect of subsequent material, the ring formation of front also easily removes, and lays a good foundation for continuous production directly also, improves the reduction efficiency of rotary kiln.
Description
Technical field
The present invention relates to metallurgical technology technical field more particularly to a kind of direct reduction of laterite nickel mine with rotary kiln ferronickel particles
Technique.
Background technique
As a kind of strategic element, nickel has extremely important status in the national economic development.The nickel in the whole world about 2/3 is used
In production stainless steel, the cost of nickel raw material accounts for 70% or so of austenitic stainless steel production cost.It in recent years, is reduction stainless steel
Production cost, stainless steel enterprises start largely to use nickel-contained pig iron.
Nickel-contained pig iron is smelted using nickeliferous 0.8~2.0% lateritic nickel ore as raw material at present, the smelting of lateritic nickel ore
Technique includes blast furnace, RKEF technique and rotary kiln for directly reducing method etc..Wherein rotary kiln for directly reducing method is one kind with continuous
The rotary kiln of rotation makees reactor, makees reducing agent with solid carbon, and iron ore is smelt the direct of iron by solid phase reduction reaction and is gone back
Former continuous casting steel machine | iron smelting method.Lateritic nickel ore at a temperature of 1000~1100 DEG C by be reduced directly can be achieved nickel, iron also
Original, but the obtained dilval particle of low-temperature reduction is tiny and cannot migrate aggregation granulating, the slag iron point in reduction-assorting room
From difficulty, cause tailings nickel content high, metal yield is lower, and only 30~40%.
For the metal yield for promoting rotary kiln for directly reducing method, directly also technique usually controls in rotary kiln also modern rotary kiln
Former section reduction temperature is 1300~1400 DEG C, and material is in half molten state in the temperature range, is sufficiently assembled conducive to ferronickel particle
It grows up so that subsequent mill is elected to be industry, metal yield is up to 80% or so.But resistance to material requirement of the hot conditions to rotary kiln
Height shortens fire resisting life-span of kiln liner, and kiln temperature is not easy to control, operational poor, the fluctuation of exhausting condition in production
Temperature raising is caused to make material melted by heat, and traditional kilneye bore is larger, fusing molten iron is acted in the chilling of kilneye cold air
Lower solidification, over time, molten steel solidification is more and more thicker, causes ring formation in kilneye, convey material can not normally, finally
Cause to stop kiln.How while guaranteeing metal yield formation rings in a kiln is prevented, becomes directly also that method reduced nickel iron particle technique is urgently
The technical issues of solution.
Summary of the invention
The purpose of the present invention is to provide a kind of works of efficient, stable direct reduction of laterite nickel mine with rotary kiln ferronickel particle
Skill.
Realizing the technical solution of the object of the invention is: a kind of technique of direct reduction of laterite nickel mine with rotary kiln ferronickel particle,
Itself the following steps are included:
1) ingredient pelletizing: by the lateritic nickel ore and carbonaceous reducing agent, lime stone and binder after dry and break process
After mixing, mixing pelletizing is made in ball press upper pressing ball；
2) reduction roasting: mixing pelletizing is sent into rotary kiln and is roasted, is provided with from kiln tail to kilneye in the rotary kiln
Three sections of section of preheating section, changeover portion and firing, the kilneye are throat structure, and the length of necking is 5~6m, preheating in rotary kiln
Duan Wendu is 400~650 DEG C, and changeover portion temperature is 650~1100 DEG C, and firing section temperature is not less than 1000 DEG C；Wherein, it is located at kiln
The temperature control of the firing section of mouth is in the range of making material keep semi-molten state, close to the temperature control of the firing section of changeover portion
In the range of making material keep solid-state；
3) water quenching；
4) ore dressing.
Preferably, it is added with binder in step 1) mixing pelletizing obtained, to improve the intensity of pelletizing.
Preferably, it is described 1) in select lateritic nickel ore, carbonaceous reducing agent, lime stone and consumption of binder ratio be (82~
88): (12~13): (0~4): (0~1.5)；It is 1050~1330 DEG C that section temperature is burnt into the step 2, wherein close to mistake
The temperature for crossing the firing section of section is 1050~1250 DEG C, and the firing section temperature positioned at kilneye is 1150~1330 DEG C.By reasonable
Ingredient can reduce mixing pelletizing fusing point, thus be burnt into section section lower reduction temperature may be selected, to the resistance to material of rotary kiln corrode
It is relatively light.
Preferably, it is described 1) in select lateritic nickel ore, carbonaceous reducing agent, lime stone and consumption of binder ratio be (82~
84.2): (12~12.5): (3~4): (1~1.5), firing section temperature is 1050~1250 DEG C in the step 2, wherein is leaned on
The temperature of the firing section of nearly changeover portion is 1100~1200 DEG C, and the firing section temperature positioned at kilneye is 1150~1250 DEG C.The number
The reduction temperature for being worth firing section in range is minimum, extends fire resisting kiln lining service life.
Preferably, the length of the firing section is 25~30m, is burnt into segment length by elongating, and makes to mix pelletizing in firing
Section full combustion, promotes reduction efficiency.
Preferably, the carbonaceous reducing agent is any one in coke powder, anthracite or semi-coke.
Pelletizing is mixed in reduction roasting step of the present invention carries out material sintering and the crystallization water for preheated section in rotary kiln
Removal enters firing section after the reduction that nickel element occurs for changeover portion and ferro element, the reduction of nickel element and metallic particles occurs
It grows up.Wherein, close to the temperature control of the firing section of changeover portion in the range of making material keep solid-state, guaranteeing metal reduction
While temperature, play the role of preventing formation rings in a kiln, the temperature control positioned at the firing section of kilneye makes material keep fritting
In the range of melting state, since the kilneye of rotary kiln is throat structure, heat is not allowed easy to lose, and material has two sections to climb in necking section
Slope, travel speed obviously slow down, and are conducive to the reduction and enrichment of metal, a small amount of ring formation occur when even if individual, subsequent
Under the rolling effect of material, the ring formation of front is also easily removed, and is laid a good foundation for continuous production directly also, is improved rotary kiln
Reduction efficiency.
Detailed description of the invention
Fig. 1 is rotary structure schematic diagram of the present invention；
Fig. 2 is the enlarged structure schematic diagram of kilneye in Fig. 1.
Specific embodiment
Present pre-ferred embodiments are described in detail below in conjunction with attached drawing.
Embodiment 1
A kind of technique of direct reduction of laterite nickel mine with rotary kiln ferronickel particle comprising following steps:
1) ingredient pelletizing: by the lateritic nickel ore and carbonaceous reducing agent, lime stone and binder after dry and break process
After mixing, mixing pelletizing, the lateritic nickel ore, carbonaceous reducing agent, lime stone and consumption of binder is made in ball press upper pressing ball
Ratio is 84.5:13:2:0.5；
2) reduction roasting: mixing pelletizing being sent into rotary kiln and is roasted, as depicted in figs. 1 and 2, from kiln in the rotary kiln
Tail 1 is provided with 30 3 sections of section of preheating section 10, changeover portion 20 and firing to kilneye 2, and the kilneye 2 of the rotary kiln is necking knot
Structure, the length of necking section are 5m, and preheating section temperature is 400~650 DEG C in rotary kiln, and changeover portion temperature is 650~1130 DEG C, are burnt
It is 1130~1280 DEG C at section temperature, wherein the temperature close to the firing section of changeover portion is 1130~1230 DEG C, positioned at kilneye
Being burnt into section temperature is 1230~1280 DEG C；
3) water quenching；
4) ore dressing.
Embodiment 2-7
Embodiment 2-7 takes step same as Example 1, and difference is raw materials used in mixing pelletizing in step 1)
Each phase temperature is different in accounting and reducing roasting process, and specific data are as shown in table 1:
Table 1
Water quenching of the present invention and beneficiation steps are the prior art, and the binder is commercial product, and ingredient is herein
It does not repeat；The carbonaceous reducing agent is any one in coke powder, anthracite or semi-coke；As depicted in figs. 1 and 2, institute of the present invention
Stating rotary kiln includes kiln tail 1 and kilneye 2, and the kilneye 2 is throat structure, wherein the length of necking is 5m, contracting in embodiment 1
The diameter D of mouth front end 21 is 3.44m, and the diameter H of necking rear end 22 is 4.85m；The length of the firing section is 30m, practical raw
It is 5~6m that necking length can be arranged in production according to production needs, and the length of setting firing section is 25~30m.
It is as shown in table 2 through ferronickel metal recovery rate in product obtained by the embodiment of the present invention 1~7.
Table 2
As can be seen from Table 2, its ferronickel metal average recovery rate of improved direct reduction process for rotary kiln reaches 82%, with height
Directly also technique is suitable and is higher than low-temperature reduction in traditional rotary kiln for warm semi-molten.Due in rotary kiln reducing roasting process of the present invention
The temperature control of the firing section of changeover portion be will be close in the range of making material keep solid-state, guaranteeing the same of metal reduction temperature
When, play the role of preventing formation rings in a kiln, the temperature control positioned at the firing section of kilneye makes material keep semi-vitreous model
In enclosing, since the kilneye of rotary kiln is throat structure, heat is not allowed easy to lose, and material has two sections of climbings in necking section, traveling
Speed obviously slows down, and is conducive to the reduction and enrichment of metal, a small amount of ring formation occurs when even if individual, subsequent material turns over
It rolls under effect, the ring formation of front also easily removes, and lays a good foundation for continuous production directly also, improves the reduction effect of rotary kiln
Rate；Due to having selected preferable lateritic nickel ore, carbonaceous reducing agent, lime stone and binder proportion in embodiment, mixing is reduced
The fusing point of pelletizing, thus be burnt into section section and lower reduction temperature may be selected, it is lighter to the erosion of rotary kiln resistance to material, extend fire resisting kiln
Serve as a contrast service life.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent process transformation made by bright description is applied directly or indirectly in other relevant technical fields, and similarly wraps
It includes in scope of patent protection of the invention.
Claims (3)
1. a kind of technique of direct reduction of laterite nickel mine with rotary kiln ferronickel particle, it is characterised in that: itself the following steps are included:
1) ingredient pelletizing: after the lateritic nickel ore after dry and break process is mixed with carbonaceous reducing agent, lime stone, in ball press
Upper pressing ball is made mixing pelletizing, is added with binder in the mixing pelletizing obtained, the lateritic nickel ore, carbonaceous reducing agent,
Lime stone and consumption of binder ratio are (82~84.2): (12~12.5): (3~4): (1~1.5)；
2) reduction roasting: mixing pelletizing is sent into rotary kiln and is roasted, is provided with preheating from kiln tail to kilneye in the rotary kiln
Three sections of section of section, changeover portion and firing, the kilneye are throat structure, and the length of necking is 5~6m, preheating section temperature in rotary kiln
Degree is 400~650 DEG C, and changeover portion temperature is 650~1100 DEG C, and the firing section temperature is 1050~1250 DEG C, wherein close
The temperature of the firing section of changeover portion is 1100~1200 DEG C, and the firing section temperature positioned at kilneye is 1150~1250 DEG C；Wherein, position
It is controlled in the range of making material keep semi-molten state in the temperature of the firing section of kilneye, close to the temperature of the firing section of changeover portion
Control is in the range of making material keep solid-state；
3) water quenching；
4) ore dressing.
2. the technique of direct reduction of laterite nickel mine with rotary kiln ferronickel particle according to claim 1, it is characterised in that: described
The length for being burnt into section is 25~30m.
3. the technique of direct reduction of laterite nickel mine with rotary kiln ferronickel particle according to claim 1, it is characterised in that: described
Carbonaceous reducing agent is any one in coke powder, anthracite or semi-coke.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710048798.0A CN106702177B (en) | 2017-01-23 | 2017-01-23 | The technique of direct reduction of laterite nickel mine with rotary kiln ferronickel particle |
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| CN201710048798.0A CN106702177B (en) | 2017-01-23 | 2017-01-23 | The technique of direct reduction of laterite nickel mine with rotary kiln ferronickel particle |
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| CN106702177B true CN106702177B (en) | 2019-08-13 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107287415B (en) * | 2017-06-20 | 2019-02-12 | 中南大学 | Strengthen the compound additive and its preparation method and application of lateritic nickel ore briquetting |
| CN108251659B (en) * | 2018-01-16 | 2020-02-21 | 中南大学 | Method for preparing ferronickel by strengthening direct reduction process of laterite-nickel ore |
| CN109022665B (en) * | 2018-08-21 | 2020-05-01 | 宝钢德盛不锈钢有限公司 | Application of ladle bottom low-nickel-chromium residual iron in common carbon steel smelting process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3746533A (en) * | 1972-03-22 | 1973-07-17 | L Moussoulos | Process of producing ferro-nickel in a rotary furnace including pelletizing and pre-reducing ore |
| US3948638A (en) * | 1973-03-23 | 1976-04-06 | Hutt Gmbh | Method for the press granulation of industrial dusts separated in dust removal systems |
| CN101033515A (en) * | 2007-04-16 | 2007-09-12 | 中南大学 | Process for preparing nickel ferroalloy by melting and reducing laterite nickel ore |
| CN101323904A (en) * | 2008-07-28 | 2008-12-17 | 红河恒昊矿业股份有限公司 | Method for enriching nickel iron ore concentrate from laterite type nickel ore by means of rotary kiln |
| CN101701275A (en) * | 2009-11-18 | 2010-05-05 | 昆明理工大学 | Method for preparing nickel iron by using rotary kiln for directly reducing nickel silicate ores |
-
2017
- 2017-01-23 CN CN201710048798.0A patent/CN106702177B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3746533A (en) * | 1972-03-22 | 1973-07-17 | L Moussoulos | Process of producing ferro-nickel in a rotary furnace including pelletizing and pre-reducing ore |
| US3948638A (en) * | 1973-03-23 | 1976-04-06 | Hutt Gmbh | Method for the press granulation of industrial dusts separated in dust removal systems |
| CN101033515A (en) * | 2007-04-16 | 2007-09-12 | 中南大学 | Process for preparing nickel ferroalloy by melting and reducing laterite nickel ore |
| CN101323904A (en) * | 2008-07-28 | 2008-12-17 | 红河恒昊矿业股份有限公司 | Method for enriching nickel iron ore concentrate from laterite type nickel ore by means of rotary kiln |
| CN101701275A (en) * | 2009-11-18 | 2010-05-05 | 昆明理工大学 | Method for preparing nickel iron by using rotary kiln for directly reducing nickel silicate ores |
Non-Patent Citations (1)
| Title |
|---|
| 红土镍矿处理工艺探讨;李小明等;《铁合金》;20071231(第04期);24-28 |
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