CN103088212A - Method and equipment for preparing carbon-bearing pellets of coal-based direct reduced iron - Google Patents
Method and equipment for preparing carbon-bearing pellets of coal-based direct reduced iron Download PDFInfo
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Abstract
The invention discloses a method for preparing carbon-bearing pellets of coal-based direct reduced iron and production equipment adopting the method, belonging to the technical field of process production of coal-based direct reduced iron. The method for preparing carbon-bearing pellets of coal-based direct reduced iron comprises the steps of material preparation and pellet fabrication, wherein the pellet fabrication is finished through two times of pellet fabrication: performing pellet fabrication for the first time by using powdered iron, carbon powder and a bonder as raw materials, and then performing pellet fabrication for the second time by taking the carbon powder and the bonder as raw materials and the pellets obtained in the first-time pellet fabrication as ball cores to obtain the carbon-bearing pellets. According to the two-time pellet fabrication process in the method, a uniform layer is formed by the carbon powder and the bonder on the surface of each ball body during the second-time pellet fabrication, so that the adhesion among the pellets and between the pellets and walls can be effectively interrupted during reduction, the normal production of reduced ion is ensured, the pellet fabrication through a disc-type pelletizing machine is realized by controlling the lower carbon powder content in the raw materials during the first-time pellet fabrication, and the production cost can be effectively reduced.
Description
Technical field
The present invention relates to a kind of preparation method and equipment of pelletizing, especially a kind of preparation method of coal-based direct reduction iron carbonaceous pelletizing and adopt the production unit of the method belongs to coal-based direct reduction iron process production techniques field.
Background technology
In the coal-based direct reduction iron Technology, be to carry out pelletizing after adopting iron fine powder, carbon dust and binding agent to prepare burden in proportion, then complete heating and reduction process in stove.In the reduction process of the carbonaceous pelletizing that existing pellet forming process makes in stove, ferric oxide can produce the ferric metasilicate of low melting point with silicon dioxde reaction, cause cohering phenomenon, affects the production of reduced iron; Simultaneously carbon content is high, wetting ability is poor, be difficult for nucleation because carbonaceous pelletizing has, and generally adopts the pressing process pelletizing, and compacting balling equipment complex structure, investment is large, the pelletizing cost is higher.
Summary of the invention
Goal of the invention of the present invention is: for the problem of above-mentioned existence, the production unit of preparation method and employing the method for a kind of coal-based direct reduction iron carbonaceous pelletizing is provided, the carbonaceous pelletizing that adopts the method and equipment to produce, can overcome carbonaceous pelletizing ferric oxide in the furnace reduction process that existing pellet forming process makes produce the ferric metasilicate of low melting point with silicon dioxde reaction and cause cohere phenomenon, the production of assurance reduced iron.
The technical solution used in the present invention is as follows:
A kind of preparation method of coal-based direct reduction iron carbonaceous pelletizing, comprise batching and pelletizing, described pelletizing is completed by twice pelletizing: carry out pelletizing for the first time take iron fine powder, carbon dust and binding agent as raw material, again take carbon dust and binding agent as raw material, as ball carries out pelletizing for the second time, obtain the carbonaceous pelletizing of coal-based direct reduction iron take pelletizing gained pelletizing for the first time.
Further, in the described raw material of pelletizing for the first time, the quality percentage composition of carbon dust is 0.1-10%.
The diameter of the described gained of pelletizing for the first time pelletizing is 14-20mm.
Further, in the described raw material of pelletizing for the second time, the quality percentage composition of carbon dust is 10-80%.
The diameter of the described gained of pelletizing for the second time pelletizing is 16-25mm.
The soft heat of the described carbon dust of pelletizing for the second time ash content is o'clock greater than 1150 ℃.
the preparation method of coal-based direct reduction iron carbonaceous pelletizing of the present invention, twice pellet forming process of creationary employing: for the first time with the iron fine powder, carbon dust and binding agent are the raw material pelletizing, for the second time take carbon dust and binding agent as raw material, and take pelletizing gained pelletizing for the first time as the ball pelletizing, described carbon dust is the general conventional raw material that adopts in producing, can select coal dust, coke powder or its mixing, described binding agent can be the wilkinite that adopts in routine production, also can be for other inorganic or organic binder bond, as epoxy resin or water glass powder, perhaps above-mentioned three's mixing, specifically, do not contain the iron fine powder in the raw material of pelletizing for the second time, the homogeneous layer that the finished pellet surface forms only is comprised of carbon dust and binding agent, this homogeneous layer has been blocked between pelletizing in the furnace reduction process, cohering between pelletizing and wall, guarantee the normal production of reduced iron.
the material carbon powder component has the poor characteristics of wetting ability, in traditional pellet forming process due to the high nucleation that is difficult for of carbon powder content of raw material, and usually adopt cold compaction technique pelletizing, the preparation method of coal-based direct reduction iron carbonaceous pelletizing of the present invention, can adopt cold compaction technique to carry out pelletizing for the first time, pelletizing can adopt bowl granulator with low cost to carry out pelletizing for the second time, the tool advantage of the present invention be can be by controlling the ratio of carbon dust in pelletizing raw material for the first time, twice pelletizing process all can be carried out in bowl granulator, the contriver studies discovery, when the iron fine powder, after carbon dust and binding agent mix, when the content of carbon dust greater than 10% the time, can produce significantly impact to its blending ingredients nucleation performance causes first core to be difficult for forming, therefore for the first time in the pelletizing process, in the control raw material, carbon powder content is 0.1-10%, its carbon content low can be in bowl granulator nucleation smoothly, the excellent hydrophilic of mixing raw material makes for the first time simultaneously, and pelletizing pelletizing itself also has reliable physical strength, in pelletizing, carbon content is 10-80% for the second time, because pelletizing for the second time is to carry out take pelletizing gained pelletizing for the first time as core, can there be the nucleation hard problem in the high carbon content raw material of pelletizing for the second time, after pelletizing, the preferred diameter of pelletizing is 14-20mm for the first time, the preferred diameter of pelletizing after pelletizing is 16-25mm for the second time, namely covering the thick carbon dust of one deck 2-9mm and binding agent composition homogeneous layer on pelletizing ball basis for the first time, this homogeneous layer can be blocked between pelletizing in the furnace reduction process, cohering between pelletizing and wall, simultaneously can provide comparatively sufficient carbon content for reduction process for whole pelletizing after twice pelletizing, carbon content of the present invention is not done strict demand in pelletizing, can add carbon in production and further replenish reduction dosage, this is also the means of production commonly used and method, the preferred sphere diameter of twice pelletizing is the response behaviour in reduction furnace and the residence time and the optimized choice made with balling efficiency, spheroid physical strength and spheroid, in pelletizing raw material for the second time, further pass through the ratio of coal dust selection or control coal dust and coke powder, control the soft heat of carbon dust ash content o'clock greater than 1150 ℃, can prevent effectively that pelletizing spheroid skin in the furnace reduction process from melting occuring or cohere, guarantee the outer field physical strength of pelletizing, than traditional pellet forming process, the pelletizing integral body of preparation method's gained of the present invention has reduced the content of binding agent to a certain extent, has improved the production efficiency of reduction furnace, need to prove, except carbon powder content, the proportioning of other two components can be techniques well known according to the demand proportioning of actual production in pelletizing process for the first time, does not therefore do too much restriction and explanation.
In actually operating, can determine for the first time and the pelletizing diameter of pelletizing for the second time according to material carbon content, as the material carbon powder content is relatively low for the second time, primary pelletizing diameter suitably dwindles, the pelletizing diameter suitably increases for the second time, makes tectum increase, with the carbon content of balance carbonaceous pelletizing integral body, vice versa, can the angle flexible operating be set by pelletizer and control in the whole production process of pelletizing.
The equipment that adopts the preparation method of coal-based direct reduction iron carbonaceous pelletizing of the present invention to produce is disposed with the first palletizing device, the first screening plant, the second palletizing device and the second screening plant along the production line direction; Described the first palletizing device front end is provided with the first raw material cabin group and the last the first mixer, and described the second palletizing device front end is provided with the second raw material cabin group.
Further, be provided with the first returns transmitting device between described the first screening plant and the last the first mixer, the first returns transmitting device sieves out diameter with the first screening plant and is returned to the last the first mixer less than the defective pelletizing of 14mm, be provided with the second returns transmitting device between described the second screening plant and the last the first mixer, the second returns transmitting device sieves out diameter with the second screening plant and is returned to the last the first mixer less than the defective pelletizing of 16mm.
Further, described the first palletizing device and the second palletizing device are bowl granulator.
the equipment of preparation coal-based direct reduction iron carbonaceous pelletizing of the present invention, be divided into twice batching and pelletizing process, so that raw material separately is equipped with, being convenient to especially is the selection of carbon dust in the pelletizing raw material for the second time, pelletizing has three kinds of raw materials for the first time, namely the first raw material cabin group of the first palletizing device is provided with 3 storehouses, each raw material cabin passes through the constant feeder of bottom according to the ratio feed of design, enter in the last the first mixer and mix, pelletizing in entering the first palletizing device, the ball of making is again by the first screening plant screening, the pelletizing that size is qualified is sent in the second palletizing device, carry out pelletizing for the second time take it as core, for the second time the pelletizing raw material with separate for the first time supply, independent the second raw material cabin group that arranges is used for storage and is equipped with in proportion the good raw material of pelletizing for the second time, and offer the second palletizing device, sieve by the second screening plant after pelletizing for the second time, the pelletizing that size is qualified is sent into next procedure and is processed, in the present invention through twice screening, pelletizing that also can intensity is not high in screening process is removed, can guarantee the physical strength of pelletizing, owing to adopting the disc type pelletizing, by regulating bowl granulator, can not produce the pelletizing over the technological standards size, therefore in twice pelletizing, the upper limit of pelletizing diameter is technic index and the bowl granulator operation index upper limit, but not the upper dimension bound of screening, therefore only need divide and sift out the less pelletizing of size, all the other pelletizings are qualified pelletizing, the present invention also is designed with defective pelletizing and returns to technique, by the first returns transmitting device and the second returns transmitting device that arranges, defective pelletizing is returned respectively in the mixed machine of the last the first mix with raw material, guarantee digestion and the processing of substandard product, need to prove, in industrial production, after pelletizing and screening for the first time, the defective pelletizing ratio of pelletizing process is very low for the second time, and its surface uniform layer content is low, and in its returns, institute's carbonaceous powder can be ignored on the impact of pelletizing for the first time.
in sum, owing to having adopted technique scheme, the preparation method of coal-based direct reduction iron carbonaceous pelletizing of the present invention and equipment beneficial effect are: twice pellet forming process that the present invention adopts, the homogeneous layer that in pelletizing, spherome surface is formed by carbon dust and binding agent for the second time, can effectively block between pelletizing in reduction, cohering between pelletizing and wall, guarantee the normal production of reduced iron, has reduction ratio high in reduction, the advantage that production efficiency is high, and by controlling for the first time lower carbon powder content in the pelletizing raw material, realize the bowl granulator pelletizing, this technique can effectively reduce production cost, the Preparation equipment of coal-based direct reduction iron carbonaceous pelletizing of the present invention, produce pelletizing than a traditional cold compaction, the production handiness is high, the pelletizing mechanical quality of output is high, can satisfy the demand of production, and have advantages of that investment is low good in economic efficiency.
Description of drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the workflow schematic diagram of present device.
Embodiment
Disclosed all features in this specification sheets, or the step in disclosed all methods or process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification sheets (comprising any accessory claim and summary) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or similar characteristics.
The preparation method of coal-based direct reduction iron carbonaceous pelletizing of the present invention.
Embodiment 1
pelletizing for the first time, with qualified raw material iron fine powder according to, carbon dust and binding agent are pressed iron fine powder 99%, carbon dust 0.1%, binding agent 0.9%(is the quality percentage composition) count dosing to rotary conveyor, sending into after three groups of supplied materials are sent into and mixed in strong mixer adds fog to carry out pelletizing for the first time in the First bowl granulator, by controlling pitch angle and the rotating speed of bowl granulator, controlling for the first time, the diameter of pelletizing pelletizing is 14-20mm, the pelletizing of pelletizing is after screening for the first time, the diameter that diameter satisfies processing requirement is that the pelletizing of 14-20mm enters second bowl granulator, be used as the ball of pelletizing for the second time.
pelletizing for the second time, raw material carbon dust and binding agent are put into each the second feed bin, by controlling selection, guarantee that the soft heat of carbon dust ash content is o'clock greater than 1150 ℃, according to carbon dust 60%, binding agent 40%(is mass percent) the ratio dosing, and send in second bowl granulator after mixing in the employing mixer, carry out pelletizing for the second time take the pelletizing of pelletizing for the first time as ball, by controlling bowl granulator pitch angle and rotating speed, controlling for the second time, the diameter of pelletizing pelletizing is 16-25mm, the pelletizing of pelletizing is after screening for the second time, obtain diameter and satisfy the finished pellet that the processing requirement diameter is 16-25mm, and enter follow-up slat dryer oven dry and go back original production.
As conventional means, described carbon dust can be for coal dust or/and coke powder, binding agent can select wilkinite or/and epoxy resin or/and conventional materials such as water glass powder.
Embodiment 2
The process of the present embodiment and embodiment 1 is basic identical, difference is for the first time pelletizing and for the second time in pelletizing, the ratio of each component raw material is different, in the present embodiment, pelletizing iron fine powder 96%, carbon dust 2%, binding agent 2%(are mass percent for the first time) prepare burden, pelletizing is according to carbon dust 80% for the second time, binding agent 20%(mass percent) prepare burden, pelletizing pelletizing diameter is 14-20mm for the first time, for the second time pelletizing diameter 16-25mm after pelletizing.
Embodiment 3
The process of the present embodiment and embodiment 1 is basic identical, difference is for the first time pelletizing and for the second time in pelletizing, the ratio of each component raw material is different, in the present embodiment, pelletizing iron fine powder 93%, carbon dust 4%, binding agent 3%(are mass percent for the first time) prepare burden, pelletizing is according to carbon dust 20% for the second time, binding agent 80%(mass percent) prepare burden, pelletizing pelletizing diameter is 14-20mm for the first time, and after pelletizing, the pelletizing diameter is 16-25mm for the second time.
Embodiment 4
The process of the present embodiment and embodiment 1 is basic identical, difference is for the first time pelletizing and for the second time in pelletizing, the ratio of each component raw material is different, in the present embodiment, pelletizing iron fine powder 90%, carbon dust 6%, binding agent 4%(are mass percent for the first time) prepare burden, pelletizing is according to carbon dust 50% for the second time, binding agent 50%(mass percent) prepare burden, pelletizing pelletizing diameter is 14-20mm for the first time, and after pelletizing, the pelletizing diameter is 16-25mm for the second time.
Embodiment 5
The process of the present embodiment and embodiment 1 is basic identical, difference is for the first time pelletizing and for the second time in pelletizing, the ratio of each component raw material is different, in the present embodiment, pelletizing iron fine powder 88%, carbon dust 8%, binding agent 4%(are mass percent for the first time) prepare burden, pelletizing is according to carbon dust 20% for the second time, binding agent 80%(mass percent) prepare burden, pelletizing pelletizing diameter is 14-20mm for the first time, and after pelletizing, the pelletizing diameter is 16-25mm for the second time.
Embodiment 6
The process of the present embodiment and embodiment 1 is basic identical, difference is for the first time pelletizing and for the second time in pelletizing, the ratio of each component raw material is different, in the present embodiment, pelletizing iron fine powder 85%, carbon dust 10%, binding agent 5%(are mass percent for the first time) prepare burden, pelletizing is according to carbon dust 10% for the second time, binding agent 90%(mass percent) prepare burden, pelletizing pelletizing diameter is 14-20mm for the first time, and after pelletizing, the pelletizing diameter is 16-25mm for the second time.
A kind of equipment that adopts described coal-based direct reduction iron carbonaceous pelletizing preparation method to produce of the present invention, its equipment and schematic flow sheet are as shown in Figure 1.
Embodiment
This production equipment comprises the first palletizing device, the first screening plant, the second palletizing device and the second screening plant that sets gradually along production line; Described the first palletizing device front end is provided with the first raw material cabin group and the last the first mixer, and the first raw material cabin group comprises 3 raw material cabins, is respectively used to store pelletizing raw material used for the first time, the strong mixer of each raw material cabin dosing to the first; Described the second palletizing device front end is provided with the second raw material cabin group, and the second raw material cabin group is used for storage and is equipped with in proportion the good raw material used of pelletizing for the second time, and feeds into the second palletizing device.
The first returns transmitting device is set between described the first screening plant and the last the first mixer, is provided with the second returns transmitting device between described the second screening plant and the last the first mixer.
Described the first palletizing device and the second palletizing device all adopt bowl granulator.
In equipment of the present invention, also comprise and suiting measures to local conditions and supporting material transmitting device, such as belt conveyor and lift etc.
The working process of this device is as follows: by the first raw material cabin group, sending in the last the first mixer of each raw material quantitative mixed, the raw material that mixes enters the first palletizing device pelletizing, the ball of making sieves by the first screening plant, qualified second palletizing device that enters carries out carrying out take it as core pelletizing for the second time, what adopt in the second palletizing device is to come to be equipped with in proportion good raw material in the second raw material cabin group, enters subsequent processing by qualified pelletizing after the second screening plant screening after pelletizing is completed for the second time and continues to process; The first screening plant sieves out diameter less than the defective pelletizing of 14mm, and will be returned to the last the first mixer as raw material by the first returns transmitting device, the second screening plant sieves out diameter less than the defective pelletizing of 16mm, and is returned to the last the first mixer as raw material by the second returns transmitting device.
Twice pellet forming process that the preparation method of coal-based direct reduction iron carbonaceous pelletizing of the present invention adopts, the homogeneous layer that in pelletizing, spherome surface is formed by carbon dust and binding agent for the second time, can effectively block between pelletizing in reduction, cohering between pelletizing and wall, guarantee the normal production of reduced iron, has reduction ratio high in reduction, the advantage that production efficiency is high, and by controlling for the first time lower carbon powder content in the pelletizing raw material, realize the bowl granulator pelletizing, avoid adopting traditional cold compaction pellet forming process, can effectively reduce production cost.The Preparation equipment of coal-based direct reduction iron carbonaceous pelletizing of the present invention, than the carbonaceous pelletizing that traditional once compacting is produced, the production handiness is high, and the pelletizing mechanical quality of output is high, can satisfy the demand of production, and has advantages of that investment is low good in economic efficiency.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (9)
1. the preparation method of a coal-based direct reduction iron carbonaceous pelletizing, comprise batching and pelletizing, it is characterized in that: described pelletizing is completed by twice pelletizing: carry out pelletizing for the first time take iron fine powder, carbon dust and binding agent as raw material, again take carbon dust and binding agent as raw material, as ball carries out pelletizing for the second time, obtain the carbonaceous pelletizing of coal-based direct reduction iron take pelletizing gained pelletizing for the first time.
2. the preparation method of coal-based direct reduction iron carbonaceous pelletizing as claimed in claim 1, it is characterized in that: in the described raw material of pelletizing for the first time, the quality percentage composition of carbon dust is 0.1-10%.
3. the preparation method of coal-based direct reduction iron carbonaceous pelletizing as claimed in claim 2, it is characterized in that: the diameter of the described gained of pelletizing for the first time pelletizing is 14-20mm.
4. the preparation method of coal-based direct reduction iron carbonaceous pelletizing as described in the claims 1 to 3 any one, it is characterized in that: in the described raw material of pelletizing for the second time, the quality percentage composition of carbon dust is 10-80%.
5. the preparation method of coal-based direct reduction iron carbonaceous pelletizing as claimed in claim 4, it is characterized in that: the diameter of the described gained of pelletizing for the second time pelletizing is 16-25mm.
6. the preparation method of coal-based direct reduction iron carbonaceous pelletizing as claimed in claim 5 is characterized in that: the soft heat of the described carbon dust of pelletizing for the second time ash content is o'clock greater than 1150 ℃.
7. an equipment for preparing the coal-based direct reduction iron carbonaceous pelletizing, is characterized in that: be disposed with the first palletizing device, the first screening plant, the second palletizing device and the second screening plant along the production line direction; Described the first palletizing device front end is provided with the first raw material cabin group and the last the first mixer, and described the second palletizing device front end is provided with the second raw material cabin group.
8. the equipment of preparation coal-based direct reduction iron carbonaceous pelletizing as claimed in claim 7, it is characterized in that: be provided with the first returns transmitting device between described the first screening plant and the last the first mixer, the first returns transmitting device sieves out diameter with the first screening plant and is returned to the last the first mixer less than the defective pelletizing of 14mm, be provided with the second returns transmitting device between described the second screening plant and the last the first mixer, the second returns transmitting device sieves out diameter with the second screening plant and is returned to the last the first mixer less than the defective pelletizing of 16mm.
9. the equipment of preparation coal-based direct reduction iron carbonaceous pelletizing as claimed in claim 8, it is characterized in that: described the first palletizing device and the second palletizing device are bowl granulator.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805280A (en) * | 2015-04-30 | 2015-07-29 | 马钢(集团)控股有限公司 | Technology for producing metal furnace burden for high-quality electric furnace by coal-based method |
| CN105950861A (en) * | 2016-07-15 | 2016-09-21 | 东北大学 | Preparation method for magnesium smelting dolomite prefabricated pellets |
| CN107794366A (en) * | 2017-10-16 | 2018-03-13 | 首钢集团有限公司 | A kind of iron ore pellets palletizing device |
| CN110079668A (en) * | 2019-04-25 | 2019-08-02 | 东北大学 | A kind of preparation method and application of bilayer carbonaceous pelletizing |
| CN116282033A (en) * | 2023-04-11 | 2023-06-23 | 昆明理工大学 | Preparation method of honeycomb reduction pellets for industrial silicon |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805280A (en) * | 2015-04-30 | 2015-07-29 | 马钢(集团)控股有限公司 | Technology for producing metal furnace burden for high-quality electric furnace by coal-based method |
| CN105950861A (en) * | 2016-07-15 | 2016-09-21 | 东北大学 | Preparation method for magnesium smelting dolomite prefabricated pellets |
| CN107794366A (en) * | 2017-10-16 | 2018-03-13 | 首钢集团有限公司 | A kind of iron ore pellets palletizing device |
| CN107794366B (en) * | 2017-10-16 | 2019-07-02 | 首钢集团有限公司 | A kind of iron ore pellets palletizing device |
| CN110079668A (en) * | 2019-04-25 | 2019-08-02 | 东北大学 | A kind of preparation method and application of bilayer carbonaceous pelletizing |
| CN116282033A (en) * | 2023-04-11 | 2023-06-23 | 昆明理工大学 | Preparation method of honeycomb reduction pellets for industrial silicon |
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Application publication date: 20130508 |