CN101928027A - Sintering process - Google Patents
Sintering process Download PDFInfo
- Publication number
- CN101928027A CN101928027A CN2009100883422A CN200910088342A CN101928027A CN 101928027 A CN101928027 A CN 101928027A CN 2009100883422 A CN2009100883422 A CN 2009100883422A CN 200910088342 A CN200910088342 A CN 200910088342A CN 101928027 A CN101928027 A CN 101928027A
- Authority
- CN
- China
- Prior art keywords
- rotary kiln
- kiln
- sintering process
- flue gas
- ash
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention discloses a sintering process, which comprises the following steps of: adding a sintering raw material into a rotary kiln from the tail end of the rotary kiln; spraying fuel from the head end of the rotary kiln to sinter the sintering raw material; discharging clinker sintered from the head end of the rotary kiln; collecting flue gas in the rotary kiln from the tail end of the rotary kiln; dedusting the collected flue gas; and returning a part of kiln dust separated from the flue gas to the rotary kiln. The sintering process can effectively eliminate ring formation in the rotary kiln, saves deslagging operation, and has high safety and low cost.
Description
Technical field
The present invention relates to a kind of sintering process, especially relate to the sintering process in a kind of alumina producing.
Background technology
Aluminum oxide is the main raw material of electrolysis aluminium metallurgy.The most of bauxite of using of the production of current aluminum oxide is as raw material, and production method mainly is a Bayer process, and minority adopts sintering process, Bayer-sintering series process etc.
In the alumina producing that adopts sintering process or Bayer-sintering series process, need carry out sintering to raw material or Bayer process red mud, adopt agglomerating plant to carry out sintering traditionally usually with rotary kiln.
Rotary kiln is the chief component of agglomerating plant.Rotary kiln is advanced in stove by sintered material and the order handled can be divided into four zones, promptly drying belt, divide ungird, clinkering zone and cooling zone.
When carrying out sintering work, because the temperature in the rotary kiln, especially the temperature height of clinkering zone, therefore the pyritous sintered material is bonded on the inwall of rotary kiln easily, the ring formation of sintered material on the rotary kiln inwall promptly takes place, particularly therefore the easier generation ring formation in part place that ungirds adjacent at clinkering zone and branch has influenced agglomerating and has normally carried out, and needs often to safeguard.When ring formation is serious, even sintering can't carry out.When ring formation acquired a certain degree, the ring formation sintered material came off from the kiln wall in addition, formed very big egg type piece, this egg type piece is in descending process, damage agglomerating plant easily, for example can damage the kiln body of rotary kiln and/or the refrigerating unit that grog is burnt till in cooling, and can bring potential safety hazard.
For this reason, conventional sintering technology need be operated the excessive slag hitting of burning till the fragmentation of grog piece in the rotary kiln with air bubble or Cinder crusher usually, has increased the complex process degree, causes production cost to increase.
Summary of the invention
The present invention is intended to solve at least one of described technical problem of the prior art.For this reason, an order of the present invention is to propose a kind of sintering process, and ring formation and technology that this sintering process can effectively reduce or eliminate in the rotary kiln are simple.
To achieve these goals, the present invention proposes a kind of sintering process, may further comprise the steps: the tail end of sintering raw material from rotary kiln joined in the rotary kiln; In rotary kiln, spray into fuel so that the sintering raw material are carried out sintering from the head end of rotary kiln; The grog that burns till after burning till is discharged from the head end of rotary kiln; Collect flue gas in the rotary kiln from the tail end of rotary kiln; The flue gas of collecting is carried out dedusting; With will be from flue gas the part of isolated kiln ash turn back in the rotary kiln from the head end of rotary kiln.
According to sintering process of the present invention, turn back in the rotary kiln owing to from flue gas, isolating the head end of a part of kiln ash from rotary kiln, especially described a part of kiln ash is delivered to the place of easy ring formation in the rotary kiln from the head end of rotary kiln, for example described a part of kiln ash turns back to clinkering zone and divides on the rotary kiln inwall at the part place that ungirds adjacent, because kiln ash temperature is low relatively, therefore sintered material is not with good adherence of the inwall of rotary kiln, reduce or eliminate the ring formation of sintered material on the inwall of rotary kiln thus, and sintering process is simple, elimination finishes the potential safety hazard of astragal, and, reduce or eliminate ring formation by the kiln ash, can not increase the sintering cost greatly yet, and can not bring adverse influence sintering.
Also have following additional technical feature according to sintering process of the present invention:
Described a part of kiln ash is blown in the rotary kiln by the head end of soot blower from rotary kiln.
By soot blower described a part of kiln ash is blown in the rotary kiln place of ring formation easily, can reliably the kiln ash be turned back in the rotary kiln place of ring formation easily.
The flue gas of collecting is carried out dedusting to be comprised: utilize the whirlwind tube that the flue gas of collecting is carried out dedusting;
The part of the isolated kiln ash of whirlwind tube is optionally turned back in the rotary kiln from the head end of rotary kiln; Flue gas after utilizing electric precipitator to the dedusting of whirlwind tube carries out electric precipitation; With the head end of the isolated whole kiln ashes of electric precipitator from rotary kiln turned back in the rotary kiln.
By whirlwind tube and dust precipitator, the flue gas of collecting from rotary kiln at first passes through whirlwind tube one-time dedusting, can remove the kiln ash of the about 80-90% in the flue gas, and then flue gas is carried out final dusting by dust precipitator, thereby the dustiness in the gas of discharging reduces greatly, has reduced the pollution to environment.If the isolated kiln ash of dust precipitator amount can not meet the demands, then the isolated a part of kiln ash of whirlwind tube is turned back in the rotary kiln, improve the reliability that reduces or eliminates ring formation.
Further comprise according to sintering process of the present invention the tail end of the isolated residue kiln of whirlwind tube ash from rotary kiln turned back in the rotary kiln.
By the tail end of the isolated residue kiln of whirlwind tube ash from rotary kiln turned back in the rotary kiln, recycle kiln ash has reduced environmental pollution, has improved economic benefit, and need not to handle in addition the kiln ash.
Described fuel is coal dust.
Further comprise according to sintering process of the present invention and to utilize inflating beam grid formula cooler that the grog that burns till of discharging is cooled off.
Utilize inflating beam grid formula cooler, can cool off burning till grog efficiently,
According to sintering process of the present invention, described a part of kiln ash turns back to clinkering zone place in the rotary kiln.
Because in the rotary kiln, therefore the place of easy ring formation, turns back to the better effects if that the clinkering zone place reduces or avoid ring formation in the rotary kiln with the kiln ash at the clinkering zone place.
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 by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 is the synoptic diagram of an example of agglomerating plant, and this agglomerating plant can be used for implementing according to embodiment of the invention sintering process;
Fig. 2 is the synoptic diagram of another example of agglomerating plant, and this agglomerating plant can be used for implementing according to embodiment of the invention sintering process;
Fig. 3 is the schematic flow sheet according to the sintering process of the embodiment of the invention; With
Fig. 4 is the schema of sintering process according to another embodiment of the present invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described 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.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
At first the formation that is used to implement according to the agglomerating plant 100 of the sintering process of the embodiment of the invention is described below with reference to figure 1 and Fig. 2.Yet, need to prove, be not limited to utilize agglomerating plant illustrated in figures 1 and 2 100 to finish according to the sintering process of the embodiment of the invention.
As shown in Figure 1, the agglomerating plant 100 according to an example comprises rotary kiln 1, burner 2 and cleaning apparatus 14.Burner 2 links to each other with the head end (right-hand member among Fig. 1) of rotary kiln 2, is used for fueling in rotary kiln 2, and for example burner 2 is a coal burner, supplies with coal dust by coal dust roots blower 3 in rotary kiln 2.Certainly, also can utilize independent blower fan in rotary kiln 2, to supply with and contain the oxygen air.
The mouth 141 that advances of cleaning apparatus 14 links to each other with the tail end (left end among Fig. 1) of rotary kiln 2, and the dust mouth of cleaning apparatus 14 links to each other with the head end of rotary kiln 2, for example, the dust mouth of cleaning apparatus 14 links to each other with an end of pipeline, and the other end of pipeline stretches into predetermined distances in the rotary kiln 2 from the head end of rotary kiln 2.Thus, cleaning apparatus 14 isolated a part of kiln ashes can turn back to from the head end of rotary kiln 2 in the rotary kiln 2, and for example, described a part of kiln ash turns back to the place that ring formation takes place in the rotary kiln 2 easily.Discharge by smoke outlet 142 through the flue gas after cleaning apparatus 14 dedustings.In one example, the dust mouth of cleaning apparatus 14 links to each other with soot blower 3, thereby utilize soot blower 3 that cleaning apparatus 14 isolated a part of kiln ashes are turned back in the rotary kiln 2, for example be blown on the inwall of the rotary kiln 2 that the ring formation place takes place in the rotary kiln 2 easily, in this example, the other end of the pipeline in the head end from rotary kiln 2 stretches into rotary kiln 2 can be provided with the nozzle (not shown), is used to spray the inwall that the kiln ash is ejected into rotary kiln 2.In addition, cleaning apparatus 14 isolated residue kiln ashes can collect.Alternatively, the outlet of cleaning apparatus 14 can also link to each other with the tail end of rotary kiln 2 so that cleaning apparatus 14 isolated residue kiln ashes are turned back in the rotary kiln 2 from the kiln tail end, thereby recycle the kiln ash, reduced pollution.
Rotary kiln 2 can be divided into four zones vertically substantially: drying belt 1a, divide ungird 1b, clinkering zone 1c and cooling zone 1d.
As shown in Figure 1, in one example, be respectively equipped with head end cover 4 and tail end cover 5 at the head end and the tail end of rotary kiln 2, and also be provided with the flue 6 that links to each other with tail end cover 5 at tail end, by head end cover 4 and tail end cover 5 and flue 6 are set, the flue gas of being convenient to rotary kiln 2 is collected.Flue 6 also links to each other with the mouth that advances of cleaning apparatus 14, thereby flue gas can enter in the cleaning apparatus 14 in flue 6, has avoided the leakage of flue gas.
For the grogs that burn till of discharging in rotary kiln 2 are cooled off, also be provided with inflating beam grid formula cooler 10 at the head end of rotary kiln 2, blower fan 12 is used for air blast in cooler 10.The cooled grog that burns till is seen off by bucket conveyer 11.
Another example of agglomerating plant 100 is described below with reference to Fig. 2.In Fig. 2, cleaning apparatus 14 comprises whirlwind tube 7 and dust precipitator 8.Whirlwind tube 7 advance that mouth links to each other with flue 6 and the smoke outlet of whirlwind tube links to each other with the mouth 81 that advances of dust precipitator 8, soot blower 3 links to each other with the dust mouth of dust precipitator 8.Thereby flue gas process dust precipitator 8 final dustings through whirlwind tube 7 one-time dedustings have reduced the kiln ash content in the discharging flue gas, have reduced environmental pollution.Whirlwind tube 7 can be removed in the flue gas kiln ash greater than 80-90%, and dust precipitator 8 can be removed the kiln ash of remaining 10-20% in the flue gas.Dust precipitator 8 isolated kiln ashes all turn back in the rotary kiln 2 from the kiln hood end by soot blower 3.Discharge by smoke outlet 82 through the flue gas after dust precipitator 8 dedustings.
As shown in Figure 2, in one example, soot blower 3 also links to each other with the dust mouth of whirlwind tube 7 optionally whirlwind tube 7 isolated a part of kiln ashes are turned back in the rotary kiln 2 from head end.For example, when dust precipitator 8 isolated kiln ash amounts can not satisfy the requirement that reduces or eliminates ring formation in the rotary kiln 2, whirlwind tube 7 isolated a part of kiln ashes can be turned back in the rotary kiln 2 from head end.For this reason, between the dust mouth of soot blower 3 and whirlwind tube 7, be connected with valve 9, can control easily by by-pass valve control 9 and return the kiln ash to rotary kiln 2 from whirlwind tube 7.
In further example, the dust mouth of whirlwind tube 7 also links to each other with the tail end of rotary kiln 2 so that whirlwind tube 7 isolated residue kiln ashes are turned back in the rotary kiln 2 from tail end.If certainly whirlwind tube 7 isolated kiln ashes do not turn back in the rotary kiln 2 from head end, then whole kiln ashes all turns back in the rotary kiln 2 from tail end, thus recycle the kiln ash, saved raw material, reduced environmental pollution.Other structures of agglomerating plant shown in Figure 2 and operation are same as shown in Figure 1, are not described in detail here.
Below with reference to Fig. 3 and in conjunction with the flow process of Fig. 1 description according to the one embodiment of the invention sintering process.
As shown in Figure 3, at first, the tail end of raw material from rotary kiln 2 joined in the rotary kiln 2, simultaneously by burner 2 and blower fan 3 from the head end of rotary kiln 2 with coal dust with contain the oxygen air and be sent in the rotary kiln 2, so that raw material are carried out sintering; Then, burning till grog discharges from the head end of rotary kiln 2; Collect flue gas in the rotary kiln 2 from the tail end of rotary kiln 2, and utilize 14 pairs of flue gases of cleaning apparatus to carry out dedusting; At last, turn back to rotary kiln 2 in and flue gas dedusting after by smoke outlet 142 discharge from the head end of rotary kiln 2 cleaning apparatus 14 isolated a part of kiln ash from flue gas.In an example of the present invention, as mentioned above, because the easiest bonding on clinkering zone 1c and the kiln wall that divides the adjacent part place of 1b that ungirds of sintered material and ring formation, therefore described a part of kiln ash can utilize pipeline to be blown on the inwall of rotary kiln 2 by soot blower 3, alternatively, end in pipeline stretches into rotary kiln 2 can nozzle, so that increase the homogeneity that the kiln ash distributes.That discharges in the rotary kiln 2 burns till grog and can utilize inflating beam grid formula cooler to cool off.
Alternatively, cleaning apparatus 14 isolated residue kiln ashes can all turn back in the rotary kiln 2 from the tail end of rotary kiln 2, have saved the operation of handling the kiln ash, and recycle the kiln ash, reduced pollution, improved benefit.
According to sintering process of the present invention,, can reduce or eliminate the ring formation in the revolution 2 by a part of kiln ash is turned back in the rotary kiln 2 from head end.Because the temperature of kiln ash is low relatively, therefore sintered material is not easy to be bonded on the inwall in the rotary kiln 2, reduce or eliminate the ring formation of sintered material on rotary kiln 2 inwalls, avoided ring formation that agglomerating is influenced, reduced the potential safety hazard that ring formation brings the damage and the ring formation of agglomerating plant.According to further example, described a part of kiln ash turns back to the clinkering zone 1c place in the rotary kiln 2, thereby reduces or eliminates the better effects if of ring formation.
In conjunction with Fig. 2 the flow process of sintering process is according to another embodiment of the present invention described below with reference to Fig. 4.
As shown in Figure 4, in sintering process embodiment illustrated in fig. 4, flue gas ash removal is divided into the two-stage dedusting, thereby can isolate the kiln ash in the flue gas more up hill and dale, wherein, at first flue gas carries out one-time dedusting through whirlwind tube 7, carries out final dusting through electric precipitator 8 again through the flue gas after 7 dedustings of whirlwind tube then, wherein whirlwind tube 7 can be isolated the kiln ash of 80-90% in the flue gas, and electric precipitator 8 can be isolated remaining kiln ash in the flue gas.Electric precipitator 8 isolated kiln ashes all turn back in the rotary kiln 2 from head end, and whirlwind tube 7 isolated a part of kiln ashes selectively turn back in the rotary kiln 2 from head end, in other words, if electric precipitator 8 isolated kiln ashes are for reducing or eliminating ring formation during quantity not sufficient, whirlwind tube 7 isolated a part of kiln ashes are turned back in the rotary kiln 2 from head end, and whirlwind tube 7 isolated residue kiln ashes all turn back to rotary kiln 2 internal recycle utilizations from tail end.Identical with operation according to sintering process embodiment illustrated in fig. 4 with other steps of sintering process embodiment illustrated in fig. 3, be not described in detail here.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple variation, modification, replacement and modification to these embodiment under the situation that does not break away from principle of the present invention and aim, scope of the present invention is limited by claim and equivalent thereof.
Claims (8)
1. a sintering process is characterized in that, may further comprise the steps:
Raw material to be sintered tail end from rotary kiln is joined in the rotary kiln;
In rotary kiln, spray into fuel so that raw material are carried out sintering from the head end of rotary kiln;
The grog that burns till after burning till is discharged from the head end of rotary kiln;
Collect flue gas in the rotary kiln from the tail end of rotary kiln;
The flue gas of collecting is carried out dedusting; With
Will be from flue gas the part of isolated kiln ash turn back in the rotary kiln from the head end of rotary kiln.
2. sintering process as claimed in claim 1 is characterized in that, described a part of kiln ash is blown in the rotary kiln by the head end of soot blower from rotary kiln.
3. sintering process as claimed in claim 2 is characterized in that, the flue gas of collecting is carried out dedusting comprise:
Utilize the whirlwind tube that the flue gas of collecting is carried out dedusting;
The part of the isolated kiln ash of whirlwind tube is optionally turned back in the rotary kiln from the head end of rotary kiln;
Flue gas after utilizing electric precipitator to the dedusting of whirlwind tube carries out electric precipitation; With
The head end of the isolated whole kiln ashes of electric precipitator from rotary kiln turned back in the rotary kiln.
4. sintering process as claimed in claim 3 is characterized in that, further comprises the tail end of the isolated residue kiln of whirlwind tube ash from rotary kiln turned back in the rotary kiln.
5. sintering process as claimed in claim 1 is characterized in that, further comprises the tail end of residue kiln ash from rotary kiln turned back in the rotary kiln.
6. sintering process as claimed in claim 1 is characterized in that, described fuel is coal dust.
7. sintering process as claimed in claim 1 is characterized in that, further comprises utilizing inflating beam grid formula cooler that the grog that burns till of discharging is cooled off.
8. as each described sintering process among the claim 1-7, it is characterized in that described a part of kiln ash turns back to clinkering zone place in the rotary kiln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100883422A CN101928027A (en) | 2009-06-26 | 2009-06-26 | Sintering process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100883422A CN101928027A (en) | 2009-06-26 | 2009-06-26 | Sintering process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101928027A true CN101928027A (en) | 2010-12-29 |
Family
ID=43367522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100883422A Pending CN101928027A (en) | 2009-06-26 | 2009-06-26 | Sintering process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101928027A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146510A (en) * | 2011-03-07 | 2011-08-10 | 攀枝花钢城集团有限公司 | Roasting method for controlling ring formation of rotary kiln |
| CN112279624A (en) * | 2020-11-23 | 2021-01-29 | 河南郑矿机器有限公司 | Coal gangue ceramsite ring-forming-preventing calcining system |
-
2009
- 2009-06-26 CN CN2009100883422A patent/CN101928027A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146510A (en) * | 2011-03-07 | 2011-08-10 | 攀枝花钢城集团有限公司 | Roasting method for controlling ring formation of rotary kiln |
| CN102146510B (en) * | 2011-03-07 | 2012-12-19 | 攀枝花钢城集团有限公司 | Roasting method for controlling ring formation of rotary kiln |
| CN112279624A (en) * | 2020-11-23 | 2021-01-29 | 河南郑矿机器有限公司 | Coal gangue ceramsite ring-forming-preventing calcining system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103641345A (en) | Material-distribution type cooling process of white cement clinker | |
| CN110639318B (en) | Environment-friendly and energy-saving coal calcining system and method thereof | |
| CN203212470U (en) | Temperature-controllable suspension roaster | |
| CN101928027A (en) | Sintering process | |
| CN201440032U (en) | Sintering apparatus | |
| CN104154762A (en) | Smelting gas dedusting and purifying method for submerged arc furnace and smelting system of submerged arc furnace | |
| CN201463514U (en) | Sintering unit for producing alumina | |
| CN210922159U (en) | High-efficient coal calcining system for clean production | |
| CN211813457U (en) | System for catching and purifying carbon dioxide in cement clinker production line | |
| CN101929797A (en) | Sintering equipment | |
| CN104748573B (en) | It is a kind of from rotary kiln take wind take heat method and desirable wind take heat rotary system | |
| CN101929798B (en) | Sintering equipment for producing alumina | |
| CN110645705B (en) | Double-stage direct-current dedusting heat exchange-free hot blast stove | |
| CN101928026B (en) | Sintering process for producing alumina | |
| CN202092451U (en) | Thermal treatment furnace utilizing combustion waste gas to isolate air to realize low oxidation | |
| CN111828994B (en) | Calcium carbide furnace purification ash conveying, burning and deslagging system | |
| CN212560337U (en) | Converter primary dry dedusting system for recycling ultra-clean coal gas | |
| CN212127989U (en) | System device for semi-dry production line for calcining active magnesium oxide | |
| CN108168292A (en) | A kind of multifunction environment-protection type BSK sintering technologies shaft furnace and its application method | |
| CN209893411U (en) | Special incinerator pollution-free cleaning system for asphalt smoke | |
| CN103451330A (en) | Improved metallurgical molten slag dry quenching treatment device and treatment method | |
| CN207471566U (en) | Biomass combustion boiler nozzle and ashes cooling system | |
| CN217979866U (en) | Lime kiln tail gas waste heat utilization system | |
| CN206094047U (en) | Coal slurry fluidized bed boiler system | |
| CN201399309Y (en) | Purifying dust remover |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20101229 |