CN108823404A - A kind of iron ore pellets bentonite adhesive formula and preparation method thereof - Google Patents
A kind of iron ore pellets bentonite adhesive formula and preparation method thereof Download PDFInfo
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- CN108823404A CN108823404A CN201810623925.XA CN201810623925A CN108823404A CN 108823404 A CN108823404 A CN 108823404A CN 201810623925 A CN201810623925 A CN 201810623925A CN 108823404 A CN108823404 A CN 108823404A
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- bentonite
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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Abstract
The invention discloses iron ore pellets bentonite adhesive formulas and preparation method thereof, belong to steel and iron industry pelletizing production technical field, solve the problems, such as that iron ore pellets are at high cost using bentonite.Binder is made of the bentonite in powder of 45-50%, the calcium oxide powder of 50-55%；CaO 1-5%, the Al wherein contained in bentonite in powder2O315‑20%、SiO260-65%；Bentonite in powder, calcium oxide powder granularity be -0.074mm account for 90-95%；Ensure that mixed bentonite adhesive CaO content reaches 45-55%.Including Step 1: examining the content and granularmetric composition of CaO in bentonite；Step 2: calculating by the content of actually detected CaO, determine that the calcium oxide powder proportion of supplying CaO content 98%, the content of the bentonite adhesive CaO after mixing ingredient reach within the scope of 45-55%.The present invention is current iron and steel enterprise's meagre profit, loss management state has sought the new way for reducing cost.
Description
Technical field
The invention belongs to steel and iron industry pelletizing production technical fields, and in particular to a kind of iron ore pellets bentonite adhesive
Formula and preparation method thereof.
Background technique
Pellet not only has many advantages, such as that grade is high, intensity is good, easy reduction, epigranular as good blast furnace burden,
And acidic pellet ore and high basicity sinter are arranged in pairs or groups, and may be constructed the reasonable burden structure of blast furnace, so that blast furnace reaches volume increase
The purpose that section is burnt, increases economic efficiency, thus domestic iron smelting pellets mineral products amount and dosage are significantly increased in recent years, medium and small blast furnace
It generally uses, annual consumption reaches hundred million tons of 1.8-2.Whether shaft furnace or grate kiln agglomerates mine, are required to particulate
Grade iron ore concentrate causes ball, meets compression strength of green pel let, drop strength, burst temperature, dry bulb compression strength, pelletizing crushing strength
Requirement, it is necessary to be incorporated a certain proportion of binder to guarantee the requirement of the above intensity, the country generally use bentonite as
Pellet binder, pelletizing proportion are 2-3%, and about 5,000,000 tons of annual consumption, bentonite is needed to exploit, be processed, and iron and steel enterprise's buying is arrived
The price at factory is about 350 yuan/t, and at high cost compared with domestic rich reserves, exploitation roast lower-cost calcium lime powder, bentonite is made
There is a problem of for iron ore pellets binder at high cost, the research and development of inexpensive binder need to be carried out.
Summary of the invention
The object of the present invention is to provide a kind of iron ore pellets bentonite adhesive formulas, to solve bentonite as iron essence
Mine pellet binder problem at high cost.
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of iron ore pellets bentonite adhesive formula, the bentonite adhesive are made of the raw material of following mass percent：
The calcium oxide powder of the bentonite in powder of 45-50%, 50-55%；The mass percentage 1-5% of the CaO wherein contained in bentonite in powder,
Al2O3Mass percentage 15-20%, SiO2Mass percentage 60-65%；CaO mass percentage in calcium oxide powder
Not less than 98%；The granularity of bentonite in powder is that -0.074mm accounts for 90-95%（Mass ratio）, the granularity of calcium oxide powder is that -0.074mm is accounted for
90-95%（Mass ratio）；Ensure that the CaO content in mixed bentonite adhesive reaches 45-55%（Mass ratio）.
A method of above-mentioned iron ore pellets bentonite adhesive is prepared, is included the following steps：
Step 1: examining the content and granularmetric composition of CaO in bentonite；
Step 2: calculating by the content of actually detected CaO, determines and be incorporated the calcium oxide powder proportion, it is swollen after mixing ingredient
The mass percentage for moistening native binder CaO reaches within the scope of 45-55%.Because quick lime meets water and generates Ca（OH）2, have compared with
Strong alkalinity can generate the product for having the hydraulicity with the active silica or active oxidation reactive aluminum of glassy state at normal temperature,
Generate it is cementing, equally have certain cementation.
Calculate described in above-mentioned steps two and is added after calcium oxide powder mixes that can be used as iron ore pellets viscous by a certain percentage
It ties agent to use, bentonite bonding agent 1-2.5% in mass ratio is directly added into iron ore concentrate, mixing, pelletizing, drying, roasting obtain
The blast furnace acid pellet for being 10-12.5mm to granularity, wet bulb drop number >=4 time/0.5m, compression strength >=10N/, does
Ball compression strength >=22N/, pre- hot-bulb compression strength >=500N/, agglomerates compression strength >=2500N/, Neng Gouman
Sufficient blast furnace requirement.
Binder after manufactured is also suitble to various dedusting ash cold-pressing balls and difficult ore dressing fine ore, dedusting ash granulation professional domain
Use.
The present invention having the beneficial effect that compared to the prior art：
The present invention has stronger alkalinity according to quick lime, at normal temperature, can active silica with glassy state or active oxidation
Reactive aluminum generates the product for having the hydraulicity, and generation is cementing, equally has the characteristics that certain cementation, and quick lime is pressed one
Certainty ratio is incorporated bentonite, is equally reached cementation.Therefore, part bentonite is substituted as binder by quick lime
To iron concentrate pelletization, quality meets next procedure requirement.The present invention selects quick lime substitution part bentonite as bonding
Agent, first is that at low cost, bentonite 350-500 member per ton is incorporated, pellet addition of bentonite cost per ton is 7-10 in 2% ratio
Member, nearby Dou You quick lime processing factory, quick lime roasting, powder processed, transportation cost are calculated by 150 yuan/t, are pressed for general iron and steel enterprise
The calculating of 50% bentonite is substituted, that is, is incorporated 1% calcium lime powder, pellet per ton is 5-6.5 member, pellet drop with adding additives cost
Inexpensive 2-3.5 member/t；Second is that pellet quality meets next procedure requirement；Third is that promoting and applying wide market, press
It substitutes half bentonite to calculate, domestic year iron ore pellets binder substitutes about 2,500,000 tons of bentonite by quick lime, and year saves
500,000,000 yuan of cost or more, remarkable benefit.The present invention be current iron and steel enterprise's meagre profit, loss management state sought one reduce at
This new way.
Specific embodiment
The present invention will be further described With reference to embodiment.
Embodiment 1
Palletizing shaft furnace bentonite CaO content 1%, Al2O3Content 20%, SiO2Content 60%, granularity granularity -0.074mm account for 90%；
Calcium lime powder CaO content 98%, granularity -0.074mm account for 90%；It is incorporated by bentonite 45%, quick lime 55%, CaO content after mixing
54.35%。
Binder dry powder supplying percent mass ratio is 2.5% after iron ore pellets mix, and by mixing, pelletizing, is obtained
Wet bulb, 100 DEG C of drying, obtains dry bulb；960 DEG C preheat 12 minutes, obtain pre- hot-bulb；1200 DEG C roast 15 minutes, are roasted
Pellet；Obtained pellet is detected respectively：The wet bulb drop strength of preparation is 8 times/0.5m, and compression strength is
18N/, dry bulb compression strength 32N/, pre- hot-bulb compression strength 670N/, agglomerates compression strength 2850N/.
150 yuan/t of calcium lime powder purchasing price used, 350 yuan/t of bentonite purchasing price.Ball is calculated by bentonite supplying 2.5%
Group's pelletizing cost is 8.75 yuan/t；It is calculated by bentonite supplying 45%, quick lime supplying 55%, binder cost is 275 yuan/t.Iron
Binder after Concentrate Pellet is mixed in 2.5% ratio supplying, pelletizing pelletizing cost are 6.88 yuan/t, iron ore pellets pelletizing cost
Reduce by 1.87 yuan/t.
Embodiment 2
Palletizing shaft furnace bentonite CaO content 5%, Al2O3Content 15%, SiO2Content 65%, granularity -0.074mm account for 95%；Raw stone
Ashes CaO content 98%, granularity -0.074mm account for 95%；It is incorporated by bentonite 55%, quick lime 45%, CaO content after mixing
46.85%。
Binder dry powder supplying percent mass ratio is 1% after iron ore pellets mix, and by mixing, pelletizing, is obtained wet
Ball, 100 DEG C of drying, obtains dry bulb；960 DEG C preheat 12 minutes, obtain pre- hot-bulb；1200 DEG C roast 15 minutes, obtain roasting ball
Nodulizing；Obtained pellet is detected respectively：The wet bulb drop strength of preparation is 7 times/0.5m, compression strength 22N/
It is a, dry bulb compression strength 39N/, pre- hot-bulb compression strength 610N/, agglomerates compression strength 2930N/.
150 yuan/t of calcium lime powder purchasing price used, 500 yuan/t of bentonite purchasing price.Pelletizing is calculated by bentonite supplying 1%
Pelletizing cost is 5 yuan/t；It is calculated by bentonite supplying 55%, quick lime supplying 45%, binder cost is 342.5 yuan/t.Iron essence
Binder after mine pelletizing is mixed in 1% ratio supplying, pelletizing pelletizing cost are 3.43 yuan/t, and iron ore pellets pelletizing cost reduces
1.57 yuan/t.
Embodiment 3
Palletizing shaft furnace bentonite CaO content 3%, Al2O3Content 17%, SiO2Content 62%, granularity -0.074mm account for 92%；Raw stone
Ashes CaO content 98%, granularity -0.074mm account for 93%；It is incorporated by bentonite 50%, quick lime 50%, CaO content after mixing
50.5%。
Binder dry powder supplying percent mass ratio is 2% after iron ore pellets mix, and by mixing, pelletizing, is obtained wet
Ball, 100 DEG C of drying, obtains dry bulb；960 DEG C preheat 12 minutes, obtain pre- hot-bulb；1200 DEG C roast 15 minutes, obtain roasting ball
Nodulizing；Obtained pellet is detected respectively：The wet bulb drop strength of preparation is 10.2 times/0.5m, and compression strength is
15N/, dry bulb compression strength 31N/, pre- hot-bulb compression strength 580N/, agglomerates compression strength 2800N/.
150 yuan/t of calcium lime powder purchasing price used, 400 yuan/t of bentonite purchasing price.Pelletizing is calculated by bentonite supplying 2%
Pelletizing cost is 8 yuan/t；It is calculated by bentonite supplying 50%, quick lime supplying 50%, binder cost is 275 yuan/t.Iron ore concentrate
Binder after pelletizing is mixed in 2% ratio supplying, pelletizing pelletizing cost are 5.5 yuan/t, and iron ore pellets pelletizing cost reduces by 2.5
Member/t.
Claims (3)
1. a kind of iron ore pellets bentonite adhesive formula, it is characterised in that：The bentonite adhesive is by following quality percentage
The raw material of ratio is made：The calcium oxide powder of the bentonite in powder of 45-50%, 50-55%；The quality of the CaO wherein contained in bentonite in powder
Percentage composition 1-5%, Al2O3Mass percentage 15-20%, SiO2Mass percentage 60-65%；In calcium oxide powder
CaO mass percentage is not less than 98%；The granularity of bentonite in powder is that -0.074mm accounts for 90-95%, the granularity of calcium oxide powder is -
0.074mm accounts for 90-95%；Ensure that the CaO content in mixed bentonite adhesive reaches 45-55%.
2. a kind of method for preparing iron ore pellets bentonite adhesive described in claim 1, it is characterised in that including following
Step：
Step 1: examining the content and granularmetric composition of CaO in bentonite；
Step 2: calculating by the content of actually detected CaO, determines and be incorporated the calcium oxide powder proportion, it is swollen after mixing ingredient
The mass percentage for moistening native binder CaO reaches within the scope of 45-55%.
3. the method for preparing iron ore pellets bentonite adhesive as claimed in claim 2, it is characterised in that：Described in step 2
Measuring and calculating, which is added by a certain percentage after calcium oxide powder mixes, can be used as the use of iron ore pellets binder, and bentonite bonding agent is pressed
Mass ratio 1-2.5% is directly added into iron ore concentrate, and mixing, pelletizing, drying, roasting obtain blast furnace acid pellet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810623925.XA CN108823404A (en) | 2018-06-15 | 2018-06-15 | A kind of iron ore pellets bentonite adhesive formula and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810623925.XA CN108823404A (en) | 2018-06-15 | 2018-06-15 | A kind of iron ore pellets bentonite adhesive formula and preparation method thereof |
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| CN108823404A true CN108823404A (en) | 2018-11-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110669925A (en) * | 2019-10-31 | 2020-01-10 | 承德信通首承矿业有限责任公司 | Alkaline bentonite for pellets |
| CN111519023A (en) * | 2020-04-10 | 2020-08-11 | 辽宁科技大学 | Calcium-containing titanium slag pelletizing technology utilizing calcium-based binder |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1924035A (en) * | 2005-09-01 | 2007-03-07 | 中南大学 | Composite agglomeration technology of iron powdered ore |
-
2018
- 2018-06-15 CN CN201810623925.XA patent/CN108823404A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1924035A (en) * | 2005-09-01 | 2007-03-07 | 中南大学 | Composite agglomeration technology of iron powdered ore |
Non-Patent Citations (1)
| Title |
|---|
| 冯英杰: "《土木工程材料》", 31 March 2014, 国防工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110669925A (en) * | 2019-10-31 | 2020-01-10 | 承德信通首承矿业有限责任公司 | Alkaline bentonite for pellets |
| CN110669925B (en) * | 2019-10-31 | 2021-03-23 | 承德信通首承科技有限责任公司 | Alkaline bentonite for pellets |
| CN111519023A (en) * | 2020-04-10 | 2020-08-11 | 辽宁科技大学 | Calcium-containing titanium slag pelletizing technology utilizing calcium-based binder |
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Application publication date: 20181116 |