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High-alkalinity pellets for blast furnace ironmaking and production method thereof

A blast furnace ironmaking and production method technology, applied in the field of iron and steel metallurgy, can solve problems such as pollution, inability to meet production requirements, energy consumption environment of pre-iron system, etc., to reduce pollution, improve energy consumption and environmental pollution, and low S content Effect

Active Publication Date: 2019-07-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the deficiency that the existing pellet production process cannot produce high-alkalinity pellets that meet the requirements, which leads to serious problems of energy consumption and environmental pollution in the blast furnace ironmaking process, and provides a High-basicity pellets for blast furnace ironmaking and production method thereof

Method used

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  • High-alkalinity pellets for blast furnace ironmaking and production method thereof
  • High-alkalinity pellets for blast furnace ironmaking and production method thereof
  • High-alkalinity pellets for blast furnace ironmaking and production method thereof

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Effect test

Embodiment 1

[0040] A kind of production method of high-basicity pellets for blast furnace ironmaking of the present embodiment, its technological process diagram is as follows figure 1 As shown, the specific steps are:

[0041] Step 1. Adding raw materials

[0042] Grind raw pelletizing raw material concentrate powder, refining slag and bentonite to make powder. The self-fluxing pellets in this embodiment are composed of the following components in mass percentage: concentrate powder 71.8%, refining slag 26.2% %, binder bentonite 2%, wherein the composition of concentrate powder, refining slag and bentonite in this embodiment is shown in Table 1-Table 3. The mixture was placed in an oven, dried at 110° C. for 2 hours, and then mixed until fully mixed to obtain the mixture.

[0043] Table 1 Concentrate powder composition list (%)

[0044]

[0045] Table 2 Composition of refining slag (%)

[0046]

[0047] Table 3 Bentonite composition list (%)

[0048]

[0049] Step 2. Green ...

Embodiment 2

[0058] A kind of method of utilizing fine ore powder and refining slag to produce high alkalinity pellets of the present embodiment, its specific steps are:

[0059] Step 1. Adding raw materials

[0060] Grind raw pelletizing raw material concentrate powder, refining slag and bentonite to make powder. The self-fluxing pellets in this embodiment are composed of the following components in mass percentage: concentrate powder 60.5%, refining slag 37.5% %, binder bentonite 2%, the composition of concentrate powder, refining slag and bentonite is the same as embodiment 1 in the present embodiment. The mixture was placed in an oven, dried at 110° C. for 2 hours, and then mixed until fully mixed to obtain the mixture.

[0061] Step 2. Green ball formation

[0062] Pellet the well-mixed mixture on a disc pelletizer with a rotating speed of 7rad / min and a disc inclination of 45° to make green pellets, and screen out the pellets with a particle size of 10-16mm. Qualified pellets, the...

Embodiment 3

[0070] A kind of method of utilizing fine ore powder and refining slag to produce high alkalinity pellets of the present embodiment, its specific steps are:

[0071] Step 1. Adding raw materials

[0072] Grind raw pelletizing raw material concentrate powder, refining slag and bentonite to make powder. The self-fluxing pellets in this embodiment are composed of the following components in mass percentage: concentrate powder 76%, refining slag 22% %, binder 2%, wherein the composition of concentrate powder, refining slag and bentonite is shown in Table 4-Table 6 below. The mixture was placed in an oven, dried at 90° C. for 2 hours, and then mixed until fully mixed to obtain the mixture.

[0073] Table 4 Concentrate powder composition table (%)

[0074]

[0075] Table 5 Composition of refining slag (%)

[0076]

[0077] Table 6 Bentonite composition table (%)

[0078]

[0079] Step 2. Green ball formation

[0080] The well-mixed mixture is pelletized on a disc pelle...

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Abstract

The invention discloses a high-alkalinity pellet for blast furnace iron making and a production method thereof and belongs to the technical field of ferrous metallurgy. The high-alkalinity pellet for blast furnace iron making is prepared from the following raw materials of concentrate powder, refining slags and bentonite, and specifically from the components in a percent by mass, namely 60-76% of the concentrate powder, 22-38% of the refining slags and 1.5-2.5% of the bentonite. The production method of the high-alkalinity pellet comprises the following steps: preparing the raw materials, forming green pellets, preheating the green pellets, roasting the green pellets and cooling the pellets. By using the concentrate powder and the refining slags as the raw materials, the alkalinity of the qualified pellets which are produced is higher than 2.0, the high-alkalinity pellet can be absolutely used as a main furnace raw material instead of high-alkalinity sintered ore, the inner consumption of the slags is realized, and waste stacking and polluting problems are solved; when pellet production and slag treatment cost is reduced, energy consumption and pollutant emission can be reduced; and the produced pellets are high in compressive strength, low in S content and great in metallurgic performance.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and more specifically relates to a method for producing high-alkalinity pellets by utilizing fine ore powder and refining slag. Background technique [0002] In steel production, the BF-BOF process has always occupied a dominant position, while blast furnace ironmaking is the main source of molten iron, accounting for more than 90% of the total pig iron production. The raw materials for blast furnace ironmaking mainly include iron ore, fuel, flux, and blast. Iron-containing raw materials. The control of the basicity of sinter and pellets is also beneficial to blast furnace slagging, ensuring the basicity and fluidity of slag, which is beneficial to blast furnace desulfurization and iron tapping. However, in the entire BF-BOF process of steel production, the energy consumption of the sintering process accounts for 7.4%, and the pelletizing process accounts for 1.2%. The environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243C22B1/02
CPCC22B1/02C22B1/2406C22B1/243
Inventor 杨佳龙杨建郭其飞李家新佘文文杨乐彪汪志鹏
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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