CN104046773A - Technique for producing cold-bonded pellets from steel converter dust removal ash - Google Patents
Technique for producing cold-bonded pellets from steel converter dust removal ash Download PDFInfo
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- CN104046773A CN104046773A CN201410288329.2A CN201410288329A CN104046773A CN 104046773 A CN104046773 A CN 104046773A CN 201410288329 A CN201410288329 A CN 201410288329A CN 104046773 A CN104046773 A CN 104046773A
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Abstract
The invention discloses a technique for producing cold-bonded pellets from steel converter dust removal ash, which comprises the following steps: separately collecting rough dust removal ash and fine dust removal ash of the steel converter, weighing iron scale, rough dust removal ash and fine dust removal ash in a mass ratio of (10-50):(20-80):(20-70), and uniformly mixing; adding the mixture into a magnesium chloride solution, and uniformly mixing, wherein the magnesium chloride solution accounts for 1-20 wt% of the total mass; and pelletizing with a pelletizer, stripping, and naturally solidifying to obtain the cold-bonded pellets. The dust removal ash does not need previous digestion treatment with water, thereby saving abundant water resources; the production technique is simple and feasible, and is implemented only by proportionally adding the inorganic weakly-alkaline binder into the iron scale, rough dust removal ash and fine dust removal, uniformly mixing and pelletizing; by using the inorganic weakly-alkaline binder, the finished cold-bonded pellets have the advantages of fewer impurities, low SiO2 content and high total iron content (not lower than 60%); and abundant cold-bonded pellets can be used in the steelmaking process, and the steelmaking process is not influenced by the addition amount.
Description
Technical field
The invention belongs to dedusting ash to producing in converter steelmaking process and carry out the technical field of recycling, be specifically related to a kind of dedusting steel-smelting converter ash and produce cooled agglomerated pellet processing method.
Background technology
In converter steelmaking process, the supplementary material adding in stove has 2% can change dust into, is converter dust-removing ash.The generating capacity of converter dust is about 20kg/t steel.This dust is mainly made up of ferric oxide, and ferric oxide massfraction is 70-95%.Remaining 5-30% dust is made up of oxide impurity, as calcium oxide and other metal oxides (being mainly zinc oxide).In steel-making dust, other compounds are automolite, Zeylanite, calcium carbonate and carbon.In steel-making dust, iron content is high, and detrimental impurity is few, if discarded, not only takies tract, contaminate environment, and wasted valuable secondary resource.
Human society and development of modern industry so far, are developed a circular economy and are obtained the generally approval in the world, and become the requirements of the times of human civilization progress.Now, China's Iron And Steel Industry continues fast development, in production capacity extreme expansion, has also been subject to the baptism of resource, the energy and environment three large factors.The road of only walking to develop a circular economy, the road of environment protection health, could really solve the bottleneck problem that restricts development of iron & steel industry, makes the enterprise's sustainable and healthy development in energy-saving and emission-reduction, the superseded overall situation falling behind of oneself.
Most iron and steel enterprise adopts the mode processing of converter dust-removing ash directly being allocated into sintering system reuse.The mode of direct reuse sintering has realized the recycling of dedusting ash resource to a certain extent, but owing to lacking, all kinds of materials homogenize, whole grain (is removed the impurity element that harm smelting iron and steel is produced with removal of impurities, as zinc, lead, potassium, sodium etc.) process, detrimental impurity has also produced circulation simultaneously, make to exist the normal problem of producing of impact in reuse process, also brought new environmental issue simultaneously.These problems concentrate on affects sintering ventilation property, and SINTERING PRODUCTION fluctuation is larger, and then affects agglomerate quality product and normal production; Owing to lacking impurity removed system, in dedusting ash, contain the harmful elements such as potassium, sodium, zinc, directly affect sintering electric precipitation effect, cause the sintering electric precipitation can not be up to standard, affect environment protection.Harmful element zinc enters blast furnace with agglomerate, and at blast furnace circulating enrichment, causes furnace nodulation, affects blast furnace and normally produces.
Owing to utilizing dedusting ash cooled agglomerated pellet to bring good economic benefit to iron and steel enterprise, most domestic iron and steel enterprise all adds dedusting ash cooled agglomerated pellet gradually in convertor steelmaking process at present, but due to the calcium oxide that contains higher proportion in converter dust-removing ash, approximately 15% left and right, domestic all cooled agglomerated pellet production technique are all first dedusting ash to be added water and cleared up at present, make calcium oxide complete reaction in dedusting ash, and then by adding the mixing of preparing burden of the bonding agent such as water glass, wilkinite, pressure ball molding, finally obtains required cooled agglomerated pellet product.First this technique need that dedusting ash is strengthened to water gaging (accounting for dedusting ash ratio 20%) and clear up processing, expends great lot of water resources; Secondly the product moisture content of producing, up to more than 15%, need to be dried moisture, and work in-process pelletizing natural air drying is longer to the dry production cycle of baking, approximately needs about 15 days; Bonding agent is introduced more impurity, cause the full iron grade of cooled agglomerated pellet to reduce, and pellet strength is bad, and steel mill can not expand usage quantity.
As Chongqing XX steelworks, 180t converter coal gas purification and recovery system have adopted dry dedusting technology.Produce according to plan 6,300,000 tons of calculating of steel per year, will produce every year 120000 tons, dedusting dust.This dust is that granularity is 35～200 object fine powders, if can not to the recycling of circulation, in transport and stacking process, must cause secondary pollution.How to solve a technique difficult problem, effectively realize the recycling of fine powder, particularly can recycle in steel-making link, to preventing secondary pollution, follow National Sustainable Development Strategies policy important in inhibiting.
Summary of the invention
For the deficiencies in the prior art, the present invention aims to provide a kind of method of converter dust-removing ash being carried out to effectively processing and resource utilization recovery use, and dedusting steel-smelting converter ash is produced cooled agglomerated pellet processing method; Method of the present invention, can carry out effectively processing and resource utilization recovery to converter dust-removing ash, prevents secondary pollution, protection of the environment, save energy, the cost of reduction converter steelmaking, real " turning waste into wealth " and the resources effective utilization realized.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
Dedusting steel-smelting converter ash is produced cooled agglomerated pellet processing method, it is characterized in that comprising the steps:
(1) collect (categorised collection) dedusting steel-smelting converter ash, obtain thick dedusting ash and thin dedusting ash, the granularity of thick dedusting ash is between 80-150 order, and the granularity of thin dedusting ash is between 150-320;
(2) by iron scale, thick dedusting ash, thin dedusting ash (10 ~ 50) in mass ratio: (20 ~ 80): (20 ~ 70) weigh, and mix;
(3) iron scale, thick dedusting ash, thin dedusting ash compound are added in magnesium chloride solution, mix; The concentration of magnesium chloride can be any concentration, preferred mass percent concentration 10-60%, and the quality of magnesium chloride solution accounts for the 1-20% of total mass;
(4) compound of the 3rd step is suppressed to balling-up with ball press, natural consolidation after the demoulding, obtains cooled agglomerated pellet.
Further feature is: add after magnesium chloride solution in the 3rd step, add sodium hydroxide solution, and the mass percent concentration 10-30% of sodium hydroxide solution, the quality of sodium hydroxide solution accounts for the 1-20% of total mass.
Add after magnesium chloride solution in the 3rd step, add calcium oxide, the quality of calcium oxide accounts for 1-15% of total mass.
Compound is suppressed balling-up with ball press, the reaction times 20-50 hour of natural consolidation after the demoulding.
The mass percent concentration 10-60% of magnesium chloride solution.
The present invention compares cooled agglomerated pellet production technology in the past, has following characteristics:
1, dedusting ash of the present invention does not need to add water and clears up in advance processing, can save great lot of water resources;
2, production technique simple possible, only need to add this patent inorganic weak bases bonding agent to mix iron scale, thick dedusting ash, thin dedusting ash in proportion, then suppresses balling-up;
3, this technique cooled agglomerated pellet is with short production cycle, and does not need baking, and product is reacted about 24 hours and can be reached requirement of strength by spontaneous curing, and moisture content of finished products is lower than 5%.
4, owing to adopting the inorganic weak bases bonding agent of this patent, the impurity that cooled agglomerated pellet finished product is brought into is few, particularly SiO2
Content is low, and all iron content is high, is not less than 60%.In steelmaking process, can use in a large number, not be subject to the impact of add-on.
5, this craft dust removal ash cooled agglomerated pellet is compared compared with the solid pellet formation technique of traditional cold, due to cancelled dedusting ash clear up,
The operations such as work in-process oven dry, production cost can be saved more than 30%.
In a word, the present invention adopts inorganic weak bases balling-up technology, utilizes converter dust-removing ash to produce cooled agglomerated pellet and is directly used in converter
Steel-making, by can be used for element (iron, carbon, the calcium etc.) recycle and reuse as far as possible of Iron and Steel Production, in protection of the environment; save energy; when reducing the cost of converter steelmaking, obtain good economic benefit and social benefit, real " turning waste into wealth " and the resources effective utilization realized.
Brief description of the drawings
Fig. 1 is process flow diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Referring to the process flow sheet of Fig. 1, dedusting steel-smelting converter ash of the present invention is produced cooled agglomerated pellet processing method, it is characterized in that:
1, collect dedusting steel-smelting converter ash, obtain thick dedusting ash and thin dedusting ash, or after processing through sieving, obtain thick dedusting ash and thin dedusting ash, the granularity of thick dedusting ash is between 80-150 order, and the granularity of thin dedusting ash is between 150-320; In steel-making converter is produced, thick dedusting ash and thin dedusting ash are separated, and are generally separate collections, obtain thick dedusting ash and thin dedusting ash that granularity is different; Or sieve
2, by iron scale, thick dedusting ash, thin dedusting ash (10 ~ 50) in mass ratio: (20 ~ 80): (20 ~ 70) weigh, and mix; Can use 1600 type mixing pans to mix, more even;
3, iron scale, thick dedusting ash, thin dedusting ash compound are added in magnesium chloride solution, mix; As the magnesium chloride solution of bonding agent, its concentration can be any concentration, preferred mass percent concentration 10-60%, and the quality of magnesium chloride solution accounts for the 1-20% of total mass;
4, the compound of the 3rd step is suppressed to balling-up with ball press, natural consolidation after the demoulding, obtains cooled agglomerated pellet;
Iron scale, thick dedusting ash, thin dedusting ash and magnesium chloride compacting balling-up, natural consolidation after the demoulding, reaction times 20-50 hour, can improve intensity, reaches and enters the requirement of converter high hopper.Reaction times is specially 20,22,24,25,26,28,30,36,40,45,50 hours etc.
Compound of the present invention, can also add sodium hydroxide solution, and concentration of sodium hydroxide solution can be any concentration, preferred mass percent concentration 10-30%, and the quality of sodium hydroxide solution accounts for the 1-20% of total mass; Add after magnesium chloride solution in the 3rd step, add sodium hydroxide solution, whole compounds are mixed.
Compound of the present invention, can also add calcium oxide, adds separately calcium oxide, or is adding after sodium hydroxide solution, then adds calcium oxide, and the quality of calcium oxide accounts for the 1-15% of total mass; Add after magnesium chloride solution in the 3rd step, add calcium oxide, mix; Or add after sodium hydroxide solution in the 3rd step, then add calcium oxide, mix.
Compound is suppressed balling-up by ball press, adopts the ball press of prior art, as XMQ10 type ball press.
Embodiment proportioning one:
Iron scale, thick dedusting ash, thin dedusting ash in mass ratio 10:20:20 weigh, and iron scale, thick dedusting ash, thin dedusting ash are respectively 10kg, 20 kg, 20 kg, after mixing, add in magnesium chloride solution, mix; Magnesium chloride solution concentration is 10%, and the quality of magnesium chloride solution is 1kg; Compound is suppressed to balling-up with ball press, and natural consolidation after the demoulding, obtains cooled agglomerated pellet;
Embodiment proportioning two:
Iron scale, thick dedusting ash, thin dedusting ash in mass ratio 10:30:40 weigh, and iron scale, thick dedusting ash, thin dedusting ash are respectively 10kg, 30 kg, 40 kg, after mixing, add in magnesium chloride solution, mix; Magnesium chloride solution concentration is 20%, and the quality of magnesium chloride solution is 5kg; Compound is suppressed to balling-up with ball press, and natural consolidation after the demoulding, obtains cooled agglomerated pellet;
Embodiment proportioning three:
Iron scale, thick dedusting ash, thin dedusting ash in mass ratio 20:40:50 weigh, and iron scale, thick dedusting ash, thin dedusting ash are respectively 20kg, 40 kg, 50 kg, after mixing, add in magnesium chloride solution, mix; Magnesium chloride solution concentration is 30%, and the quality of magnesium chloride solution is 10kg; Compound is suppressed to balling-up with ball press, and natural consolidation after the demoulding, obtains cooled agglomerated pellet;
Embodiment proportioning four:
Iron scale, thick dedusting ash, thin dedusting ash in mass ratio 30:50:50 weigh, and iron scale, thick dedusting ash, thin dedusting ash are respectively 30kg, 50 kg, 50 kg, after mixing, add in magnesium chloride solution, mix; Magnesium chloride solution concentration is 40%, and the quality of magnesium chloride solution is 12kg; Add again sodium hydroxide solution 10kg; Compound is suppressed to balling-up with ball press, and natural consolidation after the demoulding, obtains cooled agglomerated pellet;
Embodiment proportioning five:
Iron scale, thick dedusting ash, thin dedusting ash in mass ratio 40:60:70 weigh, and iron scale, thick dedusting ash, thin dedusting ash are respectively 40kg, 60 kg, 70 kg, after mixing, add in magnesium chloride solution, mix; Magnesium chloride solution concentration is 45%, and the quality of magnesium chloride solution is 20kg, then adds calcium oxide 18 kg; Compound is suppressed to balling-up with ball press, and natural consolidation after the demoulding, obtains cooled agglomerated pellet;
Embodiment proportioning 6:
Iron scale, thick dedusting ash, thin dedusting ash in mass ratio 50:80:70 weigh, and iron scale, thick dedusting ash, thin dedusting ash are respectively 50kg, 80 kg, 70 kg, after mixing, add in magnesium chloride solution, mix; Magnesium chloride solution concentration is 55%, and the quality of magnesium chloride solution is 30kg; Add again sodium hydroxide solution 30kg, add calcium oxide 20 kg; Compound is suppressed to balling-up with ball press, and natural consolidation after the demoulding, obtains cooled agglomerated pellet.
The present invention adopts inorganic weak bases combination technology, and magnesium chloride solution is inorganic salt, is weakly alkaline, and dedusting ash does not need to add water in advance and clears up processing; Obtain cooled agglomerated pellet, send high hopper for converter steelmaking directly.
The leading indicator of the cooled agglomerated pellet that the present invention obtains is:
Ultimate compression strength: >=800N/
Pelletizing granularity: oval in outline
Size range:
10～50mm, the granularity of wherein >=50mm is answered <10%, and the granularity of≤10mm is answered <5%.
The comprehensive grade of product can reach 60% left and right.
The cooled agglomerated pellet chemical composition that the present invention obtains requires to see the following form:
Table 1 converter steelmaking cooled agglomerated pellet chemical composition
| Composition | TFe | SiO2 | S | P |
| Index | ≥60% | ≤1% | ≤0.1% | ≤ 0.1% |
Steelworks uses the effect of the dedusting ash cooled agglomerated pellet of the present invention's acquisition
(1) accelerate slagging.Adding of cooled agglomerated pellet increased the FeO content in pre-slag in convertor steelmaking process, accelerates slagging speed, improves the melting rate of lime, improved pre-slag formation speed and mid-term slag physical and chemical performance.Due to the rapid melting of lime, thereby the dephosphorization in smelting process, sweetening effectiveness are improved.
(2) cooling performance is better, improves slag charge structure.Owing to adding cooled agglomerated pellet in slag in batches, it melts the input that heat absorption can corresponding other slag charges of minimizing; Cooled agglomerated pellet adds after converter, and the raising of lime melting rate adds that a part of C a O that cooled agglomerated pellet is brought into can reduce the consumption of lime; Change the improvement of slag effect, can reduce the usage quantity of fluorite, simultaneously due to the raising of initial stage basicity of slag, the solubleness of M g O in slag is reduced, reduce lining erosion, be conducive to improve converter lining life.
(3) prevent " returning dry ", improve recovery rate of iron.Heavy steel converter dirt mud cooled agglomerated pellet density is larger, and has certain density, and within it adds stove time, a part exists in slag, and another part directly enters slag interface and contacts with molten metal, becomes " transmitter " of oxygen; The raising of slagging speed and raising (FeO), greatly alleviated " returning dry " and metal splash that fierce reaction between carbon and oxygen causes; In the cooled agglomerated pellet of blowing melting in mid-term, ferric oxide is reduced into iron and enters molten steel, reduces molten steel itself and is oxidized the metal loss causing, and has improved recovery rate of iron.
(4) utilize converter dust-removing ash to produce cooled agglomerated pellet and be directly used in converter steelmaking, will can be used for element (iron, carbon, the calcium etc.) recycle and reuse as far as possible of Iron and Steel Production, protection of the environment, save energy, the one-tenth of reduction converter steelmaking
This, obtain good economic benefit and social benefit.Real " turning waste into wealth " and the resources effective utilization realized.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention but not restriction technologies scheme, although applicant has been described in detail the present invention with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, those are modified or are equal to replacement technical scheme of the present invention, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. dedusting steel-smelting converter ash is produced a cooled agglomerated pellet processing method, it is characterized in that comprising the steps:
(1) collect dedusting steel-smelting converter ash, obtain two kinds of thick dedusting ash and thin dedusting ash, the granularity of described thick dedusting ash is between 80-150 order, and the granularity of described thin dedusting ash is between 150-320;
(2) by iron scale, thick dedusting ash, thin dedusting ash (10 ~ 50) in mass ratio: (20 ~ 80): (20 ~ 70) weigh, and mix;
(3) iron scale, thick dedusting ash, thin dedusting ash compound are added in magnesium chloride solution, mix; The quality of magnesium chloride solution accounts for the 1-20% of total mass;
(4) compound of the 3rd step is suppressed to balling-up with ball press, natural consolidation after the demoulding, obtains cooled agglomerated pellet.
2. dedusting steel-smelting converter ash is produced cooled agglomerated pellet processing method according to claim 1, it is characterized in that: add after magnesium chloride solution in (3) step, add again sodium hydroxide solution, the mass percent concentration 10-30% of sodium hydroxide solution, the quality of sodium hydroxide solution accounts for the 1-20% of total mass.
3. produce cooled agglomerated pellet processing method according to dedusting steel-smelting converter ash described in claim 1 or 2, it is characterized in that: add after magnesium chloride solution in (3) step, add calcium oxide, the quality of calcium oxide accounts for 1-15% of total mass.
4. a kind of dedusting steel-smelting converter ash according to claim 1 and 2 is produced cooled agglomerated pellet processing method, it is characterized in that, compound is suppressed balling-up with ball press, the reaction times 20-50 hour of natural consolidation after the demoulding.
5. a kind of dedusting steel-smelting converter ash according to claim 4 is produced cooled agglomerated pellet processing method, it is characterized in that the mass percent concentration 10-60% of magnesium chloride solution.
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| CN105803190A (en) * | 2014-12-30 | 2016-07-27 | 上海梅山钢铁股份有限公司 | Method for preparing cold-bonded pellets of low water content by using dry method electrostatic precipitator dust of converter gas |
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| CN106755980A (en) * | 2016-12-14 | 2017-05-31 | 钢城集团凉山瑞海实业有限公司 | Coal-pressing ball and preparation method thereof |
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| CN107119187A (en) * | 2017-05-18 | 2017-09-01 | 天津瑞利鑫环保科技有限公司 | A kind of dedusting ash cold-consolidated ball production system and technique |
| CN107460312A (en) * | 2017-09-12 | 2017-12-12 | 重庆大学 | Binding agent and cooled agglomerated pellet for converter dry dedusting ash cooled agglomerated pellet |
| CN107385222B (en) * | 2017-09-18 | 2019-04-09 | 宝钢德盛不锈钢有限公司 | The carbon containing dedusting ash reuse method of rotary kiln and carbon containing dedusting ash reclaiming system |
| CN107385222A (en) * | 2017-09-18 | 2017-11-24 | 宝钢德盛不锈钢有限公司 | The carbon containing dedusting ash reuse method of rotary kiln and carbon containing dedusting ash reclaiming system |
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