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Vanadium-titanium alkaline pellet production method

A technology of alkaline pellets and a production method, applied in the field of pellets for blast furnace ironmaking, can solve the problems of many broken balls and reduced output, and achieve the effects of improving the amount of powder, improving the pelletizing performance and improving the affinity

Active Publication Date: 2020-02-14
承德信通首承科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production method of alkaline pellets with single iron powder mixed with limestone powder and bentonite as the main material. The impact is relatively large, the roasting atmosphere of the grate machine is good, and the local temperature in the rotary kiln is too high, resulting in ring formation in the kiln, but the cooling of the ring cooler is not good, there are more broken balls and powder, and the output is reduced by about 30%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of vanadium-titanium alkaline pellets, comprising the steps of:

[0025] S1: mixing 80 parts by weight of limestone powder into 20 parts by weight of bentonite to make alkaline bentonite;

[0026] S2: Mix 4-6 parts by weight of magnesia bentonite into 100 parts by weight of fine iron powder, then add 1.3-1.5 parts by weight of bentonite, and add 0.2 parts by weight of magnesia bentonite as a mixture ;

[0027] S3: mixing the mixture with a mixer;

[0028] S4: Alkaline bentonite is transported to the pelletizing chamber through the belt, and then transported to the pelletizing disc through the belt, and then add mixing materials and water to the disc pelletizing machine to obtain raw pellets; the diameter of the raw pellets is 1- 20mm;

[0029] S5: After the green balls are screened, dried, preheated, roasted, kiln head cloth, kiln head cooling, and ring cooler cooling, vanadium-titanium alkaline pellets are obtained.

[0030] In this embodiment,...

Embodiment 2

[0032] In this embodiment, the magnesium oxide content of magnesia bentonite is more than 50% of the total amount, and the limestone content of alkaline bentonite is more than 45% of the total amount. %above. The mass percentage of particle size of -0.074mm in iron fine powder is required to be more than 70%; the mass percentage of sulfur element in iron fine powder is less than 0.3%.

Embodiment 3

[0034] As a preferred embodiment, in step S5, the sieving step includes: sieving green balls with a particle size greater than 16 mm and re-ballooning with a large ball roller sieve; ; Get 8-16mm rice-grade qualified raw balls, and then enter the chain grate machine for drying.

[0035] Wherein, the drying step includes: the temperature is gradually increased from 200°C to 400°C, the heating rate is 26.6°C / min, and the total drying time is 7.5 minutes;

[0036] Further, the preheating process includes: preheating for 1 minute when the temperature is 500°C, preheating for 1 minute when the temperature is raised to 600°C, preheating for 1 minute when the temperature is raised to 700°C, and preheating for 1 minute when the temperature is raised to 800°C. Preheat for 1 minute at 900°C, 2 minutes for 1000°C, and 5 minutes for 1080°C, where the temperature at the highest point of the bellows reaches 550-600°C.

[0037] The roasting method includes: roasting for 4 minutes at a tempe...

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PUM

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Abstract

The invention discloses a vanadium-titanium alkaline pellet production method. The vanadium-titanium alkaline pellet production method comprises the following steps: S1, mixing 80 parts by weight of limestone powder with 20 parts by weight of bentonite to prepare alkaline bentonite; S2, adding 4-6 parts by weight of magnesia bentonite into 100 parts by weight of iron ore powder, adding 1.3-1.5 part of bentonite, and adding 0.2 part by weight of magnesia bentonite as a material mixture; S3, uniformly mixing the material mixture through a mixer; S4, transporting alkaline bentonite into a circular disc pelletizer, adding the material mixture and water, and pelletizing to obtain fresh pellets, wherein the diameters of the fresh pellets are 1-20 mm; and S5, sequentially performing screening, drying, pre-heating, roasting, kiln head distributing, kiln head cooling and ring cooler cooling on the fresh pellets, thereby obtaining vanadium-titanium alkaline pellets. The vanadium-titanium alkaline pellet production method improves pelletizing and pellet-forming performance, is beneficial for green pellet roasting, improves a condition that powder is much and atmosphere is poor in a roasting process, can achieve the mass production target in a chain-grate machine-rotary kiln pellet production process, and only reduces yield ratio design ability by about 15%.

Description

technical field [0001] The invention belongs to the technical field of pellets for blast furnace ironmaking, and in particular relates to a production method of vanadium-titanium alkaline pellets. Background technique [0002] For a long time, the metallurgical properties of acid pellets have met the requirements of blast furnaces, and some indicators are better than sintered ore. However, with the advancement of blast furnace smelting technology and the acceleration of operation speed, the requirements for the quality of furnace materials have been increased, and the old acid pellets can no longer meet the requirements of fast operation of modern blast furnaces. It is well known that adding CaO and / or MgO fine-grained materials (such as limestone or dolomite) to iron concentrate before pelletizing is very beneficial to improve the physical and metallurgical properties of pellets. From the point of view of improving metallurgical properties, one of the ways to improve the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/243C22B1/02C22B1/26
CPCC22B1/02C22B1/24C22B1/243C22B1/26
Inventor 李成峰陈庆恒彭立安衡宝印
Owner 承德信通首承科技有限责任公司
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