CN113136486A - Production method and formula of pellets added with low-nickel high-iron nickel ore - Google Patents

Production method and formula of pellets added with low-nickel high-iron nickel ore Download PDF

Info

Publication number
CN113136486A
CN113136486A CN202010508181.4A CN202010508181A CN113136486A CN 113136486 A CN113136486 A CN 113136486A CN 202010508181 A CN202010508181 A CN 202010508181A CN 113136486 A CN113136486 A CN 113136486A
Authority
CN
China
Prior art keywords
low
iron
nickel
nickel ore
pellets
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.)
Granted
Application number
CN202010508181.4A
Other languages
Chinese (zh)
Other versions
CN113136486B (en
Inventor
孙松青
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianjin Hanlin International Trade Co ltd
Original Assignee
Tianjin Hanlin International Trade Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tianjin Hanlin International Trade Co ltd filed Critical Tianjin Hanlin International Trade Co ltd
Priority to CN202010508181.4A priority Critical patent/CN113136486B/en
Publication of CN113136486A publication Critical patent/CN113136486A/en
Application granted granted Critical
Publication of CN113136486B publication Critical patent/CN113136486B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
    • 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
    • C22B1/16—Sintering; Agglomerating
    • C22B1/216—Sintering; Agglomerating in rotary furnaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention relates to a method for producing pellets added with low-nickel high-iron nickel ore, which comprises the steps of replacing bentonite with low-nickel high-iron nickel ore completely or partially, increasing the using amount of the bentonite, mixing the bentonite with iron concentrate powder, carrying out drying and wet grinding pretreatment, using pelletizing equipment, adding water to pelletize the mixture to form green pellets, screening qualified green pellets, conveying the qualified green pellets to a chain grate machine through a distributor, carrying out drying preheating, and feeding the preheated green pellets into a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare finished pellets. On the premise of meeting the requirement of blast furnace charging, the low-nickel high-iron nickel ore is used for replacing bentonite in pellet production, the using amount is further increased, and the quality and the economic benefit of pellet ore are improved.

Description

Production method and formula of pellets added with low-nickel high-iron nickel ore
Technical Field
The invention relates to the technical field of metallurgy, in particular to a production method and a formula of pellets for blast furnace ironmaking.
Background
The existing pellet production process mainly adopts fine iron powder as a raw material, uses bentonite as an additive, and mainly aims to improve the falling strength and the bursting temperature of green pellets, but the additive does not contain iron and can obviously reduce the pellet grade after being used in large quantity, theoretically, the grade of finished pellets is reduced by about 0.55 percent and the strength of the finished pellets is also reduced every time 1 percent of bentonite is added, so that the pellet value is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pellet production method which reduces or is not suitable for bentonite, so as to improve the economic benefit of pellet and reduce the production cost of steel.
The technical means adopted by the invention are as follows.
A method for producing pellets added with low-nickel high-iron nickel ore sequentially comprises the following steps:
step (1) batching and mixing: mixing the low-nickel high-iron nickel ore and the iron concentrate powder, completely or partially replacing bentonite with the low-nickel high-iron nickel ore, and performing drying and wet grinding pretreatment;
pelletizing in step (2): adding water into the mixture by using pelletizing equipment to pelletize the mixture into green pellets, and screening out qualified green pellets;
step (3), material distribution and drying preheating: conveying the qualified green pellets to a chain grate machine through a distributor for drying and preheating;
roasting and cooling in the step (4): and (3) feeding the preheated green pellets into a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare finished pellets.
In the step (1), the low-nickel high-iron nickel ore, the iron concentrate powder and the bentonite are proportioned according to mass fraction, and the raw materials comprise: low-nickel high-iron nickel ore: 1% -15%, fine iron powder: 85-99%, bentonite: 0 to 5 percent.
In the step (1), the granularity requirement of the mixture is that the granules with the granularity less than or equal to 0.074mm are more than or equal to 75 percent.
The pelletizing process in the step (2) is carried out in a pelletizing disc, the grain size composition is controlled in the pelletizing process, the green pellet granularity is required to be more than or equal to 85 percent in an 8-16mm interval, the falling strength of the green pellet is required to be more than or equal to 5 times per pellet, and the compressive strength is more than or equal to 10N per pellet; the addition amount of water is controlled, and the water content of the green ball is less than or equal to 8.7 percent.
The distributing device in the step (3) comprises a large ball roller screen device and a small ball roller screen device, the conveyed raw balls are further classified through the large ball roller screen device and the small ball roller screen device, and the gap between the large roller screen device and the small roller screen device is adjusted, so that the proportion of the obtained raw balls with the granularity of 8-16mm is more than 85%.
In the step (3), the drying and preheating are divided into a drying section and a preheating section, the temperature of the starting end of the drying section is 100 ℃, the temperature of the end point of the preheating section is 1050 ℃, the temperature is increased in a gradient manner, the machine speed of a chain grate machine is 1.5m/min, the strength of the preheated balls before entering the rotary kiln is more than or equal to 300N/ball, and the fracture ratio is less than 10%.
A pellet formula for producing pellets by adding low-nickel high-iron nickel ore is prepared by mixing low-nickel high-iron nickel ore and iron concentrate powder, and completely or partially replacing bentonite with low-nickel high-iron nickel ore.
The low-nickel high-iron nickel ore, the iron concentrate powder and the bentonite are proportioned by mass fraction and comprise the following components: low-nickel high-iron nickel ore: 1% -15%, fine iron powder: 85-99%, bentonite: 0 to 5 percent.
The invention has the beneficial effects that: the low-nickel high-iron nickel ore has low price, the price of the fine iron powder is about 3 to 4 times of that of the low-nickel high-iron nickel ore, and the price of the fine iron powder is about 3 times of that of the low-nickel high-iron nickel ore in terms of tonnage. The low-nickel high-iron nickel ore is used for replacing bentonite in pellet production, the using amount is further increased, and the quality and the economic benefit of pellet ore are improved.
Drawings
FIG. 1 is a flow chart of a pellet production method of the present invention.
Detailed Description
Theoretically, the grade of finished pellets is increased by about 0.55% every time 1% of bentonite is replaced. As shown in table 1, the components and properties of the conventional bentonite and low-nickel high-iron nickel ore are shown. The low-nickel high-iron nickel ore has the iron content of 45-50 percent, the nickel content of less than 1 percent, the iron content is lower than that of main iron ore, the low-nickel high-iron nickel ore is not suitable for producing sinter ore, and the low-nickel high-iron nickel ore does not have the industrial value of producing ferronickel, so the low-nickel high-iron nickel ore is less used in the production of steel, but has the characteristic that the balling index is far higher than that of bentonite.
Figure BDA0002527298780000021
TABLE 1
According to the basic principle, the invention provides a method for producing pellets added with low-nickel high-iron nickel ore, which sequentially comprises the following steps:
step (1) batching and mixing: mixing the low-nickel high-iron nickel ore and the iron concentrate powder, completely or partially replacing bentonite with the low-nickel high-iron nickel ore, and performing drying and wet grinding pretreatment.
Pelletizing in step (2): and (3) pelletizing the mixture by using pelletizing equipment and adding water to form green pellets, and screening out qualified green pellets.
Step (3), material distribution and drying preheating: and conveying the qualified green pellets to a chain grate machine through a distributor for drying and preheating.
Roasting and cooling in the step (4): and (3) feeding the preheated green pellets into a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare finished pellets.
In the step (1), the low-nickel high-iron nickel ore, the iron concentrate powder and the bentonite are proportioned according to mass fraction, and the raw materials comprise the following components: low-nickel high-iron nickel ore: 1% -15%, fine iron powder: 85-99%, bentonite: 0 to 5 percent. In the step (1), the low-nickel high-iron nickel ore needs to be subjected to stone removal and other impurities, and then is dried by an airing and drying machine to remove part of water, so that the dry low-nickel high-iron nickel ore is obtained. This is a common practice in the art and is well known to those of ordinary skill in the art.
In the step (1), the granularity requirement of the mixture is that the granules with the granularity less than or equal to 0.074mm are more than or equal to 75 percent.
In the step (1), the low-nickel high-iron nickel ore is subjected to impurity removal and drying treatment.
The pelletizing process in the step (2) is carried out in a pelletizing disc, the grain size composition is controlled in the pelletizing process, the green pellet granularity is required to be more than or equal to 85 percent in an 8-16mm interval, the falling strength of the green pellet is required to be more than or equal to 5 times per pellet, and the compressive strength is more than or equal to 10N per pellet; the addition amount of water is controlled, and the water content of the green ball is less than or equal to 8.7 percent.
The distributing device in the step (3) comprises a large ball roller screen device and a small ball roller screen device, the conveyed raw balls are further classified through the large ball roller screen device and the small ball roller screen device, and the gap between the large roller screen device and the small roller screen device is adjusted, so that the proportion of the obtained raw balls with the granularity of 8-16mm is more than 85%.
The drying and preheating in the step (3) are divided into a drying section and a preheating section, the temperature of the starting end of the drying section is 100 ℃, the temperature of the end point of the preheating section is 1050 ℃, the temperature is increased in a gradient manner, the machine speed of a chain grate machine is 1.5m/min, the strength of the preheated balls before entering the rotary kiln is more than or equal to 300N/ball, and the fracture ratio is less than 10 percent
The following are specific examples.
Fig. 1 is a flow chart of a pellet production method in the present application. The equipment that uses in this case all is current mature equipment.
Example 1
The production method is as described in the above steps (1) to (4).
In the step (1), the dry basis mass percentage of the ingredients is as follows: 97% of iron fine powder, 1% of low-nickel high-iron nickel ore powder and 2% of bentonite.
In the step (2), the water content is 8.6%.
In the step (3), the gap between the roller screens is adjusted to meet the requirement of screening out green balls or powder with the granularity of less than 8mm and more than 16 mm.
The drying preheating parameters of the grate can be set according to table 2.
Figure BDA0002527298780000041
TABLE 2
And (4) feeding the preheated green pellets into a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare finished pellets.
Examples 2-10, and comparative examples the procedure was the same as in example 1, with the parameters shown in table 3 below.
Figure BDA0002527298780000042
Figure BDA0002527298780000051
TABLE 3
Through the examples and the comparative examples in the table 3, it can be found that the compressive strength and the grade of the finished ball are obviously improved by replacing 2% of bentonite with low-nickel high-iron nickel ore in the example 3 and the comparative example.
Along with the continuous adding and using of the low-nickel high-iron nickel ore, the compressive strength of finished balls is increased and is more than about 10%, the compressive strength is gradually reduced, the use is about 15%, the compressive strength of the balls is close to the low value required by charging, about 2000N/ball, meanwhile, the ring formation in a rotary kiln is increased, the smooth production is influenced, and the reasonable use range of the low-nickel high-iron nickel ore is within 15%.
All the percentages in the specification are mass percentages.

Claims (8)

1. A production method and a formula of pellets added with low-nickel high-iron nickel ore are characterized by sequentially comprising the following steps:
step (1) batching and mixing: mixing the low-nickel high-iron nickel ore and the iron concentrate powder, completely or partially replacing bentonite with the low-nickel high-iron nickel ore, and performing drying and wet grinding pretreatment;
pelletizing in step (2): adding water into the mixture by using pelletizing equipment to pelletize the mixture into green pellets, and screening out qualified green pellets;
step (3), material distribution and drying preheating: conveying the qualified green pellets to a chain grate machine through a distributor for drying and preheating;
roasting and cooling in the step (4): and (3) feeding the preheated green pellets into a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare finished pellets.
2. The method for producing the pellets added with the low-nickel high-iron nickel ore according to the claim 1, is characterized in that: in the step (1), the low-nickel high-iron nickel ore, the iron concentrate powder and the bentonite are proportioned according to mass fraction, and the raw materials comprise: low-nickel high-iron nickel ore: 1% -15%, fine iron powder: 85-99%, bentonite: 0 to 5 percent.
3. The method for producing the pellets added with the low-nickel high-iron nickel ore according to the claim 2, is characterized in that: in the step (1), the granularity requirement of the mixture is that the granules with the granularity less than or equal to 0.074mm are more than or equal to 75 percent.
4. The method for producing the pellets added with the low-nickel high-iron nickel ore according to the claim 1, is characterized in that: the pelletizing process in the step (2) is carried out in a pelletizing disc, the grain size composition is controlled in the pelletizing process, the green pellet granularity is required to be more than or equal to 85 percent in an 8-16mm interval, the falling strength of the green pellet is required to be more than or equal to 5 times per pellet, and the compressive strength is more than or equal to 10N per pellet; the addition amount of water is controlled, and the water content of the green ball is less than or equal to 8.7 percent.
5. The method for producing the pellets added with the low-nickel high-iron nickel ore according to the claim 1, is characterized in that: the distributing device in the step (3) comprises a large ball roller screen device and a small ball roller screen device, the conveyed raw balls are further classified through the large ball roller screen device and the small ball roller screen device, and the gap between the large roller screen device and the small roller screen device is adjusted, so that the proportion of the obtained raw balls with the granularity of 8-16mm is more than 85%.
6. The method for producing the pellets added with the low-nickel high-iron nickel ore according to the claim 1, is characterized in that: in the step (3), the drying and preheating are divided into a drying section and a preheating section, the temperature of the starting end of the drying section is 100 ℃, the temperature of the end point of the preheating section is 1050 ℃, the temperature is increased in a gradient manner, the machine speed of a chain grate machine is 1.5m/min, the strength of the preheated balls before entering the rotary kiln is more than or equal to 300N/ball, and the fracture ratio is less than 10%.
7. A formula of a production pellet added with low-nickel high-iron nickel ore is characterized in that the low-nickel high-iron nickel ore and iron concentrate powder are mixed, and the low-nickel high-iron nickel ore is used for completely or partially replacing bentonite.
8. The pellet formula for producing added low-nickel high-iron nickel ore according to claim 7, wherein the low-nickel high-iron nickel ore, iron concentrate powder and bentonite comprise the following components in percentage by mass: low-nickel high-iron nickel ore: 1% -15%, fine iron powder: 85-99%, bentonite: 0 to 5 percent.
CN202010508181.4A 2020-06-05 2020-06-05 Production method and formula of pellets added with low-nickel high-iron nickel ore Active CN113136486B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010508181.4A CN113136486B (en) 2020-06-05 2020-06-05 Production method and formula of pellets added with low-nickel high-iron nickel ore

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010508181.4A CN113136486B (en) 2020-06-05 2020-06-05 Production method and formula of pellets added with low-nickel high-iron nickel ore

Publications (2)

Publication Number Publication Date
CN113136486A true CN113136486A (en) 2021-07-20
CN113136486B CN113136486B (en) 2022-09-02

Family

ID=76809756

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010508181.4A Active CN113136486B (en) 2020-06-05 2020-06-05 Production method and formula of pellets added with low-nickel high-iron nickel ore

Country Status (1)

Country Link
CN (1) CN113136486B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113774216A (en) * 2021-07-29 2021-12-10 江苏沙钢集团有限公司 Preparation method of pellets using laterite-nickel ore as pellet binder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1804057A (en) * 2006-01-16 2006-07-19 唐山国丰钢铁有限公司 Method for making pellet by fine-grinded steel slag instead of bentonite
CN104357657A (en) * 2014-12-02 2015-02-18 内蒙古包钢钢联股份有限公司 Method for preparing oxidized pellets from converter dedusting ash
WO2018099558A1 (en) * 2016-11-30 2018-06-07 S.A. Lhoist Recherche Et Developpement Metallic ore pellets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1804057A (en) * 2006-01-16 2006-07-19 唐山国丰钢铁有限公司 Method for making pellet by fine-grinded steel slag instead of bentonite
CN104357657A (en) * 2014-12-02 2015-02-18 内蒙古包钢钢联股份有限公司 Method for preparing oxidized pellets from converter dedusting ash
WO2018099558A1 (en) * 2016-11-30 2018-06-07 S.A. Lhoist Recherche Et Developpement Metallic ore pellets

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
张天启: "《竖炉球团技能300问》", 30 June 2013, 冶金工业出版社 *
董威: "《粗糙集理论及其数据挖掘应用》", 31 October 2014, 东北大学出版社 *
陈利生等: "《火法冶金：备料与焙烧技术》", 30 April 2011, 冶金工业出版社 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113774216A (en) * 2021-07-29 2021-12-10 江苏沙钢集团有限公司 Preparation method of pellets using laterite-nickel ore as pellet binder

Also Published As

Publication number Publication date
CN113136486B (en) 2022-09-02

Similar Documents

Publication Publication Date Title
CN103320607B (en) A kind of cold-consolidated ball and preparation method thereof
CN110229960A (en) A kind of method that coarse grain iron-stone prepares magnesium-containing pellets
CN111910072A (en) Preparation and use methods of pre-reduced fluxed pellets with steel slag as partial raw material
CN102776364B (en) Process for recovering titanium and iron from titanomagnetite tailings
CN107739820A (en) Magnetite powder pellet and its production method
CN110791645B (en) Production method of vanadium-titanium alkaline pellet ore
CN113136486B (en) Production method and formula of pellets added with low-nickel high-iron nickel ore
WO2013140810A1 (en) Method for adjusting precursor powder for sintering, and precursor powder for sintering
CN112813258B (en) Method for producing alkaline pellets by utilizing neutralized slag and sulfuric acid slag
CN102121065B (en) Mineral powder moulding binder
CN103114198A (en) Method for utilizing nickel flash smelting water-quenched slag
JP6900696B2 (en) Metal oxide smelting method
CN110205487B (en) Production method of fluorine-containing vanadium-titanium pellet ore
CN117363886A (en) Production method of high-titanium pellet
CN116179846A (en) Pellet production method with high proportion of hematite
CN110564949B (en) Method for reducing powder content of alkaline pellet
CN113652545B (en) Production method of large-stacking-angle fluxed pellets
CN112779416A (en) Low-silicon sintering method
CN113774216A (en) Preparation method of pellets using laterite-nickel ore as pellet binder
CN108774684B (en) Application method of stainless steel refining slag in laterite sintering
CN103882223B (en) A kind of method improving red soil nickel ore bursting temperature of pellet ores
CN102776356B (en) Method for improving pellet qualities
CN1051759A (en) Production of pellet with reveert as core
CN110669925B (en) Alkaline bentonite for pellets
CN103834802A (en) Titanium pellet for smelting high titanium slag and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant