CN101838733B - Roasting process of nickel-containing material - Google Patents
Roasting process of nickel-containing material Download PDFInfo
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- CN101838733B CN101838733B CN200910244192XA CN200910244192A CN101838733B CN 101838733 B CN101838733 B CN 101838733B CN 200910244192X A CN200910244192X A CN 200910244192XA CN 200910244192 A CN200910244192 A CN 200910244192A CN 101838733 B CN101838733 B CN 101838733B
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Abstract
The invention discloses a roasting process of a nickel-containing material, comprising the following steps of: adding the nickel-containing material and pea coals into a rotary kiln from the tail end of the rotary kiln; blowing to feed fuels from the head end of the rotary kiln to the interior of the rotary kiln; blowing to feed primary air form the head end of the rotary kiln to the interior of the rotary kiln to control the shape and the length of flames; blowing to feed secondary air which controls the head area of the rotary kiln to be with a reducing atmosphere from the head end of the rotary kiln to the interior of the rotary kiln; and discharging fired heat-roasted material from the head end of the rotary kiln. The roasting process of the nickel-containing material of invention can pre-reduce a part of nickel oxide and ferric oxide and reduce the electricity consumption of the subsequent electro-smelting.
Description
Technical field
The present invention relates to a kind of roasting process of nickel-containing material, especially relate to a kind of roasting process of nickel-containing material of the power consumption can reduce follow-up electrosmelting the time.
Background technology
Nickel-containing material, for example nickel laterite utilizes electric furnace to carry out melting usually, before electrosmelting, need carry out roasting with rotary kiln usually, to slough moisture wherein.
When utilizing traditional rotary kiln that nickel-containing material is carried out traditional roasting; Cold nickel-containing material joins in the rotary kiln from the kiln tail; Spraying into fuel from kiln hood and carry out roasting, is oxidizing atmosphere in the whole rotary kiln, any reduction can not take place; Therefore nickel, the ferriferous oxide in the material can not be reduced, and the power consumption of follow-up electric furnace is very big.
With traditional rotary kiln baking the time, the costs and poor dehydration results of roasting material especially can't thoroughly be sloughed crystal water.
The thermal bake-out material of discharging from the head end of traditional rotary kiln is delivered to electric furnace after the cooling usually and is carried out melting, does not therefore utilize the heat of roasting material, has wasted the energy, and has caused the power consumption of follow-up electric furnace to increase.
Summary of the invention
The present invention is intended to solve at least one of technical problem that exists in the prior art.For this reason, one object of the present invention be to propose a kind of can carry out roasting to nickel-containing material simultaneously can the prereduction nickel oxide, ferriferous oxide, reduce the sinter process of nickel-containing material of the power consumption of follow-up electrosmelting thus.
To achieve these goals, according to roasting process of nickel-containing material of the present invention, may further comprise the steps: in rotary kiln, add nickel-containing material and beans from the tail end of rotary kiln; Send fuel from head end drum in rotary kiln of rotary kiln; Send a wind to control the shape and the length of flame from head end drum in rotary kiln of rotary kiln; Send head end zone internal control with rotary kiln to be made as reducing atmosphere and the end edge region of rotary kiln is controlled to be the secondary air of oxidizing atmosphere from the head end of rotary kiln drum in rotary kiln; With the thermal bake-out material that burns till from the discharge of rotary kiln head end.
Sinter process according to roasting nickel-containing material of the present invention; Owing to added beans and from the controlled secondary air that blasted of head end from the tail end of rotary kiln; Therefore can the atmosphere of rotary kiln tail end be controlled to be oxidizing atmosphere,, simultaneously the rotary kiln head end be controlled to be reducing atmosphere so that nickel-containing material is carried out roasting; Utilization is carried out prereduction from the beans that tail end adds to the nickel the nickel-containing material, ferriferous oxide, has reduced the power consumption of follow-up electric furnace.
In addition, also have following additional technical feature according to roasting process of nickel-containing material of the present invention:
Further comprise middle part bulging tertiary air that send in rotary kiln according to roasting process of nickel-containing material of the present invention from rotary kiln.
Through being blown into tertiary air at the rotary kiln middle part; Can promote secondary combustion in the kiln, improve the temperature in the rotary kiln, the length lengthening of oxidation panel comparatively high temps band; Thereby improve the thermo-efficiency of roasting; Dehydrating effect is good, especially can slough crystal water, and can easily control the temperature in the rotary kiln.
Further comprise thermal bake-out material according to roasting process of nickel-containing material of the present invention with sealing insulation feed bin is admitted and storage is discharged in the rotary kiln.
Comprise further that according to roasting process of nickel-containing material of the present invention the thermal bake-out material is incubated feed bin from sealing to be discharged in the batch can.
Through sealing insulation roasting feed bin and batch can are set, can under the condition of high temperature, deliver to electrosmelting from the roasting material that rotary kiln is discharged through batch can, made full use of the heat of roasting material, reduced power consumption.
Said secondary air is a hot blast.
Said nickel-containing material and beans join in the rotary kiln from the tail end of rotary kiln together.
Said fuel is fine coal.
Hyperchannel burner through extending in the rotary kiln is delivered to fine coal and a wind drum in the rotary kiln.
Additional aspect of the present invention and advantage part in the following description provide, and part will become obviously from the following description, or recognize through practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage obviously with are easily understood becoming the description of embodiment from combining figs, wherein:
Fig. 1 is the structural representation that is used to implement according to the roasting apparatus of the roasting process of nickel-containing material of the embodiment of the invention;
Fig. 2 is the schema of roasting process of nickel-containing material according to an embodiment of the invention; With
Fig. 3 is the schema of roasting process of nickel-containing material according to another embodiment of the present invention.
Embodiment
Describe embodiments of the invention below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the present invention, and can not be interpreted as limitation of the present invention.
At first describe below and be used to implement roasting apparatus of nickel-containing material according to the roasting process of nickel-containing material of the embodiment of the invention with reference to figure 1.As shown in Figure 1, comprise rotary kiln 1, bearing 2, drive unit 3, burner 4, primary air fan 5 and overfire air fan 12 according to the roasting apparatus of nickel-containing material of the embodiment of the invention.
Rotary kiln 1 rotatably is supported on the bearing 2 and has head end (right-hand member among Fig. 1) and tail end (left end among Fig. 1).The tail end of rotary kiln 1 is provided with charging opening that in rotary kiln 1, adds nickel-containing material and the beans that is used for adding beans in rotary kiln and adds inlet.In an example of the present invention, charging opening and beans add inlet should do broad understanding, and for example they can be the openings that is provided with respectively, also can be to constitute by same mouthful.In a concrete example, charging opening and beans add inlet and can be made up of the tail end that opens wide of rotary kiln 1.
In an example of the present invention; As shown in Figure 1, for the ease of reinforced and beans, and the kiln tail sealed; Tail end at rotary kiln 1 is provided with airtight kiln hood 9; The filling tube of rotary kiln 1 and beans adding pipe (not shown) can pass airtight kiln hood 9 and go deep in the rotary kiln 1, thereby can in rotary kiln 1, add nickel-containing material and beans easily, and guarantee that flue gas does not leak.
The head end of rotary kiln 1 is provided with the discharge port of discharging roasting material, be used in rotary kiln drum send wind with control combustion flame shape and length primary air nozzle and be used for that drum send secondary air the head end zone internal control of rotary kiln is made as the overfiren air port of reducing atmosphere in rotary kiln.Equally, discharge port, fuel entrance, primary air nozzle and overfiren air port also should be done broad understanding, for example can be to be made up of independent mouth.In a concrete example, discharge port, fuel entrance, primary air nozzle and overfiren air port can be made up of the head end that rotary kiln 1 opens wide.
Drive unit 3 is used for driving rotational kiln 1 and on bearing 2, rotates, and as shown in Figure 1, drive unit can comprise motor, speed reduction unit, is installed in gear and the gear ring that is installed on the outer wall of rotary kiln 1 with toothing on the speed reduction unit.Certainly, drive unit 3 is not limited to above-mentioned concrete example.
Burner 4 inserts in the rotary kiln 1 from the fuel entrance and send fuel, for example fine coal with drum in rotary kiln 1.As shown in Figure 1, in a concrete example of the present invention, burner 4 comprises fuel delivery pipe 41, is used for fuel injected when blow-on.Burner 4 also comprises coal supply pipe 42, is used for fine coal is supplied in the rotary kiln 1.One time airduct 7 links to each other with burner 4 with primary air fan 5, thereby primary air fan 5 blows wind one time through an airduct 7 in rotary kiln 1, control the shape and the length of flame thus.
Overfire air fan 12 links to each other with overfiren air port in rotary kiln 1, to send into secondary air, and overfire air fan 12 for example can blast the hot blast through preheating in rotary kiln 1, thereby the head end zone T of rotary kiln 1 is controlled to be reducing atmosphere.In the example depicted in fig. 1; Primary air fan 5 links to each other with burner 4 through an airduct 7; Burner 4 for example is to have multichannel sleeve structure, can a wind be injected in the rotary kiln 1 through burner 4 through the radial outside passage of burner 4 and the radially inner side passage of burner 4 thus.Tail end through from rotary kiln 1 adds beans; And through the control secondary air, T is controlled to be reducing atmosphere with the head end zone, and the end edge region W of rotary kiln 1 is an oxidizing atmosphere; Thereby nickel, ferriferous oxide in can the prereduction nickel-containing material reduce the energy consumption of follow-up electrosmelting thus.
As shown in Figure 1, in an example of the present invention, be provided with tertiary air orifice 101 at the cardinal principle middle part of rotary kiln 1; Tertiary air orifice 101 links to each other with tertiary air machine 6, in rotary kiln 1, blasts tertiary air with the middle part from rotary kiln 1, need to prove; Tertiary air orifice 101 is positioned at the cardinal principle middle part of rotary kiln 1; And need not to be the middle, as long as the length in the higher temperate zone of oxidation panel of can extending through the tertiary air that sprays into, tertiary air orifice is a plurality of.Through 1 middle part blasts tertiary air in rotary kiln from tertiary air machine 6 from rotary kiln, can promote secondary combustion in the kiln, easily control the temperature in the rotary kiln 1; And increased the length in the higher temperate zone of oxidation panel; Improved thermo-efficiency, dehydrating effect is good, especially can slough crystal water; Make dehydration thoroughly fully, this is that traditional rotary kiln institute is irrealizable.
As shown in Figure 1, be provided with airtight kiln hood cover 10 at the head end of rotary kiln 1, airtight kiln hood cover 10 links to each other with the unlimited head end of rotary kiln 1 and is used to seal the head end that rotary kiln opens wide, thereby avoids flue gas to reveal.Overfire air fan 12 links to each other with the top of airtight kiln hood cover 10.
In order further to reduce the energy consumption of follow-up electrosmelting; Head end at rotary kiln 1 is provided with sealing insulation roasting feed bin 8; Sealing insulation roasting feed bin 8 is arranged on the below of airtight kiln hood 10 and links to each other with airtight kiln hood 10, is used to admit and store the thermal bake-out material of discharging from rotary kiln 1.Thermal bake-out material in the sealing insulation roasting feed bin 8 can directly be delivered to electric furnace through batch can L and carry out melting, thereby has utilized the heat in the thermal bake-out material, has practiced thrift the energy, has further reduced power consumption.
With reference to figure 2 roasting process of nickel-containing material flow process is according to an embodiment of the invention described below.
As shown in Figure 2, at first, in rotary kiln 1, add nickel-containing material and beans from the tail end of rotary kiln 1.In rotary kiln 1, spray into fine coal and a wind from the head end of rotary kiln 1 through burner 4 and primary air fan 5; In rotary kiln 1, blow secondary air through overfire air fan 12 simultaneously; Thereby shape and length through a wind control flame; And through secondary air the end edge region W of rotary kiln 1 is controlled to be oxidizing atmosphere, and head end zone T is controlled to be reducing atmosphere.At end edge region W, nickel-containing material heats to passing through, roasting, to slough moisture wherein.Head end zone T utilizes beans as reductive agent, the ferronickel in the nickel-containing material is carried out prereduction, thereby restore the part ferronickel.At last, the thermal bake-out material that will pass through roasting and prereduction is discharged from the head end of rotary kiln 1, utilizes batch can L to send electrosmelting, need not cooling, and therefore part of nickel, ferriferous oxide reduced the power consumption of electrosmelting by prereduction.
With reference to figure 3 flow process of roasting process of nickel-containing material is according to another embodiment of the present invention described below.Nickel-containing material and beans are joined in the rotary kiln 1 from the tail end of rotary kiln 1 together.In rotary kiln 1, spray into a wind of fine coal and heat through burner 4 and primary air fan 5 from the head end of rotary kiln 1; In rotary kiln 1, blow secondary hot-air through overfire air fan 12 simultaneously; Thereby shape and length through a wind control flame; Thereby through secondary air the end edge region W of rotary kiln 1 is controlled to be oxidizing atmosphere, and head end zone T is controlled to be reducing atmosphere.At end edge region W, to nickel-containing material heat, roasting, to slough moisture wherein.In rotary kiln 1, spray into tertiary air from the cardinal principle middle part of rotary kiln 1, promote secondary combustion in the kiln, the length that prolongs the high-temperature zone thus; Increased oxidation panel; Feasible dehydration is more abundant, especially can slough crystal water, and makes temperature in the control rotary kiln 1 become to be more prone to.Then, T carries out prereduction to ferronickel in the head end zone.
To pass through the sealing that roasting is thoroughly dewatered and discharge from the head end of rotary kiln 1 through the thermal bake-out material of prereduction and be incubated in the feed bin 8, and utilize batch can L directly the high-temperature roasting material to be delivered to electrosmelting.Thus, roasting material dehydration fully, part of nickel, ferriferous oxide be by prereduction, and the thermal bake-out material directly send electrosmelting, therefore greatly reduces the power consumption of electrosmelting, improved efficient.
In addition,, therefore, can reclaim, avoid the flue gas leakage from head end and tail end discharged flue gas owing to be provided with airtight kiln hood cover 10 and airtight kiln hood 9 respectively at the head end and the tail end of rotary kiln 1.
Although illustrated and described embodiments of the invention; Those having ordinary skill in the art will appreciate that: under the situation that does not break away from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited claim and equivalent thereof.
Claims (8)
1. a roasting process of nickel-containing material is characterized in that, may further comprise the steps:
In rotary kiln, add nickel-containing material and beans from the tail end of rotary kiln;
Send fuel from head end drum in rotary kiln of rotary kiln;
Send a wind to control the shape and the length of flame from head end drum in rotary kiln of rotary kiln;
Send head end zone internal control with rotary kiln to be made as reducing atmosphere and the end edge region of rotary kiln is controlled to be the secondary air of oxidizing atmosphere from the head end of rotary kiln drum in rotary kiln; With
Discharge the thermal bake-out material that burns till from the rotary kiln head end.
2. roasting process of nickel-containing material according to claim 1 is characterized in that, further comprises from middle part drum in rotary kiln of rotary kiln sending tertiary air.
3. roasting process of nickel-containing material according to claim 1 is characterized in that, further comprises the thermal bake-out material with sealing insulation feed bin is admitted and storage is discharged in the rotary kiln.
4. roasting process of nickel-containing material according to claim 3 is characterized in that, the thermal bake-out material is discharged in the batch can from sealing insulation feed bin.
5. roasting process of nickel-containing material according to claim 1 is characterized in that, said secondary air is a hot blast.
6. roasting process of nickel-containing material according to claim 1 is characterized in that said nickel-containing material and beans join in the rotary kiln from the tail end of rotary kiln together.
7. roasting process of nickel-containing material according to claim 1 is characterized in that, said fuel is fine coal.
8. roasting process of nickel-containing material according to claim 7 is characterized in that, through the hyperchannel burner that extend in the rotary kiln fine coal and a wind drum is delivered in the rotary kiln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910244192XA CN101838733B (en) | 2009-12-30 | 2009-12-30 | Roasting process of nickel-containing material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910244192XA CN101838733B (en) | 2009-12-30 | 2009-12-30 | Roasting process of nickel-containing material |
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| Publication Number | Publication Date |
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| CN101838733A CN101838733A (en) | 2010-09-22 |
| CN101838733B true CN101838733B (en) | 2012-02-15 |
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| CN200910244192XA Active CN101838733B (en) | 2009-12-30 | 2009-12-30 | Roasting process of nickel-containing material |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102234717B (en) * | 2011-03-29 | 2013-03-06 | 中国恩菲工程技术有限公司 | Method for roasting red mud nickel ore |
| CN103397127B (en) * | 2013-07-28 | 2014-12-10 | 张英华 | Smelting reduction ironmaking device and ironmaking method |
| CN103952539B (en) * | 2014-04-24 | 2016-08-17 | 中国恩菲工程技术有限公司 | Laterite roasting system |
| CN106369994B (en) * | 2016-10-28 | 2019-02-15 | 王彬海 | Rotary kiln fluosolids roasting device and roasting technique |
| CN108411131B (en) * | 2018-03-28 | 2019-12-06 | 中冶东方工程技术有限公司 | Manganese-silicon alloy production system and manganese-silicon alloy production process |
| RU2745519C1 (en) * | 2020-05-25 | 2021-03-25 | Иван Николаевич Грознов | Rotary furnace for oxidizing burning of sulfide ore |
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