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Preparation method of low-silicon high-magnesium iron ore pellets

A technology of high-magnesium pellets and iron ore pellets, applied in the field of metallurgy, can solve the problems of wide reflow temperature range of pellets, high price of nodular iron fine powder, high-silicon and low-magnesium pellets are not suitable for large-scale smelting, and reduce waste , Excellent metallurgical performance, and the effect of improving production efficiency

Inactive Publication Date: 2016-11-16
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the price of spheroidizing iron concentrate is high, high-silicon and low-magnesium pellets are not suitable for large-scale smelting, the remelting temperature range of pellets is wide, and the smelting of blast furnace pellets is uneconomical

Method used

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  • Preparation method of low-silicon high-magnesium iron ore pellets
  • Preparation method of low-silicon high-magnesium iron ore pellets
  • Preparation method of low-silicon high-magnesium iron ore pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Magnesium-containing low-silicon iron concentrate powder (in terms of mass fraction, Si: 2.7%, magnesium: 1.6%) is finely ground to obtain iron concentrate powder, and the -200 mesh particle size of iron concentrate powder is 65%;

[0038] Step 1) The iron ore concentrate powder is magnesium-containing low-silicon iron ore concentrate powder, in terms of mass fraction, Si: 0.5%-4.5%, magnesium: 0.5%-3.8%. 2) Mix iron concentrate powder and binder bentonite into a mixture, the weight ratio is: iron concentrate powder 97%, binder 3%;

[0039] 3) The mixture is subjected to high-pressure roller milling, drying to a moisture content of 6%, and then mixed with a powerful mixer;

[0040] 4) The mixture is made into pellets by adding water to the disc pelletizer, and the amount of water added is 8% of the total amount of materials. After passing through the vibrating screen, the qualified raw pellets with a particle size of 9-15mm are sieved;

[0041] 5) Qualified green ba...

Embodiment 2

[0045] 1) Magnesium-containing low-silicon iron concentrate powder (in terms of mass fraction, Si: 2.9%, magnesium: 1.9%) is finely ground to obtain iron concentrate powder, and the -200 mesh particle size of the iron concentrate powder is 68%;

[0046] 2) The iron concentrate powder and composite binder are formulated into a mixture at a ratio of 99.5:0.5, and the weight ratio is: 99.5% iron concentrate powder and 0.5% binder;

[0047] 3) The mixture is subjected to high-pressure roller milling, drying to a moisture content of 8%, and then mixed with a powerful mixer;

[0048] 4) The mixture is made into pellets by adding water to the disc pelletizer, and the amount of water added is 9% of the total amount of materials. After passing through a vibrating screen, qualified raw pellets with a particle size of 9-15mm are screened out;

[0049] 5) Qualified raw balls are transported to the grate machine for drying and preheating. The preheating temperature is controlled at 1100°C,...

Embodiment 3

[0053] 1) Magnesium-containing low-silicon iron ore concentrate powder (by mass fraction, Si: 0.5%, magnesium: 3.8%) is mixed with high-silicon iron ore concentrate powder (by mass fraction, Si: 3.5%, magnesium: 0.01%) Use high-pressure roller mill iron ore powder to finely grind to obtain mixed iron ore concentrate powder, the -200 mesh particle size of mixed iron ore concentrate powder is 75%; magnesium-containing low-silicon iron ore concentrate powder: high-silicon iron ore concentrate powder=60: 40

[0054] 2) Mix iron concentrate powder and binder bentonite 98:2 to make a mixture, the weight ratio is: iron concentrate powder 98%, binder 2%;

[0055] 3) The mixture is subjected to high-pressure roller milling, drying to a moisture content of 9%, and then mixed with a powerful mixer;

[0056] 4) The mixture is made into pellets by adding water to the disc pelletizer, the amount of water added is 6% of the total amount of materials, and passed through a vibrating screen to...

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Abstract

The invention relates to a method for preparing low-silicon high-magnesium iron ore pellets, which belongs to the field of metallurgy technology. The specific method is to pulverize and finely grind iron concentrate to obtain iron concentrate powder, which requires a fineness of -200 mesh ≥ 65%; Concentrate powder and binder are made into a mixture, which is subjected to high-pressure roller milling, drying, and then mixed by a powerful mixer; the mixture is pelletized by adding water to a disc pelletizer, and passed through a vibrating screen to obtain a particle size of 9‑ 15mm qualified green pellets; transported to the grate machine for drying and preheating, and then into the rotary kiln for roasting, after roasting, the high-temperature pellets are cooled and cooled, and the explosive powdered pellets are screened to obtain qualified low-silicon and high-magnesium pellets. The invention uses low-silicon and high-magnesium iron concentrate powder without adding magnesium-containing materials, and only uses ordinary binders to produce ternary alkalinity ≥ 1.5, containing MgO ≥ 3.30%, and containing SiO 2 ≤3.5% pellets.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing low-silicon and high-magnesium iron ore pellets. Background technique [0002] my country's iron and steel production capacity accounts for 50% of the world's total production capacity, and the consumption of pellets is close to 200 million tons, accounting for less than 20% of the blast furnace charge structure on average. A few iron and steel enterprises such as Taiyuan Iron and Steel Co., Ltd. and Shougang Jingtang have close to that 30%. Compared with the sintering process, the current pelletizing process has the advantages of lower waste gas emissions, less pollutant emissions, lower process consumption, and less difficulty in flue gas treatment. The wide interval has become a restrictive factor restricting the increase ratio of blast furnaces. In order to reduce environmental pollution in the sintering production process, Western count...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B1/24C22B1/242C22B1/243C22B1/26
CPCC22B1/2406C22B1/02C22B1/242C22B1/243C22B1/26
Inventor 王新东李建新常金宝胡启晨郝良元田京雷
Owner HEBEI IRON AND STEEL
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