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Method for directly preparing molten steel from high-silicon iron ores

A direct, iron ore technology, applied in the field of direct preparation of molten steel from high-silicon iron ore, can solve the problems of inability to obtain low-silicon molten iron, rising beneficiation costs, and high iron loss, avoiding iron-smelting and steel-making processes and reducing refining steps , the effect of short production cycle

Active Publication Date: 2016-07-13
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
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Problems solved by technology

Due to the long and complicated process of these methods, the cost of mineral processing has increased significantly; at the same time, for this type of high-silicon iron ore, the above methods also have the following disadvantages: because the silica gangue minerals are dispersed in the iron ore with extremely fine particle size In the phase, the mineral must be ground to a very fine particle size (less than 20μm) to separate the silica gangue from the iron ore powder to obtain a better desiliconization effect, so the iron loss is high
Unable to obtain low-silicon molten iron suitable for converter steelmaking

Method used

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  • Method for directly preparing molten steel from high-silicon iron ores
  • Method for directly preparing molten steel from high-silicon iron ores
  • Method for directly preparing molten steel from high-silicon iron ores

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preparation example Construction

[0049] Step 1. Preparation of biochar: Waste biomass is pyrolyzed under the condition of 300-500° C. in isolation from air to produce biochar, and the obtained biochar is ball-milled into fine-grained charcoal powder.

[0050] The fixed carbon content in the biomass charcoal obtained in this step is greater than 60wt%, the volatile matter content is greater than 30wt%, and the ash content is less than 5wt%. After crushing and ball milling, the particle size of the fine-grained biomass charcoal powder is less than 80 μm. at 1000°C and CO 2 The partial pressure is greater than 0.5atm, and the biomass charcoal powder can be completely gasified within 10 minutes.

[0051] Step 2, ore crushing: take high silicon iron ore as raw material, the total iron content of the high silicon iron ore is greater than 55wt%, and the silicon dioxide content is greater than 10wt%, and it is broken into fine granular mineral powder with a crusher and a ball mill , The particle size of mineral powd...

Embodiment 1

[0066][1]. Preparation of biochar: waste jujube wood was pyrolyzed and carbonized at 400℃ to prepare biochar. The industrial analysis results of the obtained biochar are shown in Table 2. The gasification performance of the obtained biochar is as follows: figure 2 shown. The prepared biochar is ball-milled, and its particle size is less than 80 μm.

[0067] Table 2. The industrial analysis result (wt%) of biochar used in embodiment one

[0068] .

[0069] [2]. Mineral material crushing: take 500g of the above-mentioned high silicon iron ore, preliminarily crush and fully ball mill, and its particle size will reach less than 80μm.

[0070] [3]. Pellet preparation: mix the above-mentioned iron ore powder, charcoal powder and a certain amount of CaO. The amount of biochar used is 122g, that is, the amount satisfies that the molar ratio of C / O in the carbon-containing pellets is 0.8. Wherein CaO addition satisfies CaOwt% / SiO 2 wt% = 2.0. The mixed material was made into...

Embodiment 2

[0077] [1]. Preparation of biochar: same as Example 1.

[0078] [2]. Mineral material crushing: take 500g of the above-mentioned high silicon iron ore, preliminarily crush and fully ball mill, and its particle size will reach less than 80μm.

[0079] [3]. Pellet preparation: mix the above-mentioned iron ore powder, charcoal powder and a certain amount of CaO. The amount of biochar used is 122g, that is, the amount satisfies that the molar ratio of C / O in the carbon-containing pellets is 0.8. Wherein CaO addition satisfies CaOwt% / SiO 2 wt% = 1.0. The mixed material was made into pellets with a diameter of 10.0 mm. The ball binder uses 2.0% waste paper pulp.

[0080] [4]. Pellet drying: After the pellets were dried naturally for 24 hours, they were further dried at 300°C for 2 hours.

[0081] [5]. Direct reduction: Reduction under the following conditions: use a tube furnace, the reduction temperature is 1100 ° C, the reduction time is 20 minutes, and CO / CO is introduced 2...

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Abstract

The invention discloses a method for directly preparing molten steel from high-silicon iron ores. The method comprises the following steps of: preparation and grinding of biomass charcoal, grinding and ball milling of the high-silicon iron ores, preparation of carbon-containing pellets, direct reduction, and separation of high-temperature iron slag. Compared with existing methods for processing the high-silicon iron ores, the method has the advantages that biomass charcoal is prepared from wide-source agricultural biomass waste and is utilized as a reducer for preparing the carbon-containing pellets, and the carbon-containing pellets are subjected to direct reduction and electric furnace high-temperature melting by virtue of a commercial FASTMELT process; by controlling reduction conditions, high metallized pellets with extremely carbon residue are obtained in a direct reduction stage; and the molten steel with the quality directly reaching or exceeding converter tapping standards is directly obtained in a high-temperature melting stage. The method has the advantages that the recovery rate of iron is high, the quality of the obtained liquid-state low-carbon and low-silicon molten steel is good, and the like. According to the method, the conventional sintering-blast furnace-converter flow for iron-making and steel-making is avoided, so that the flow of processing the high-silicon iron ores is greatly simplified.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy-non-blast furnace ironmaking, and relates to a utilization process of refractory high-silicon iron ore (high-silicon red iron ore), in particular to a method for directly preparing molten steel from high-silicon iron ore. Background technique [0002] With the increasing depletion of rich ore resources around the world, some previously neglected iron ore resources have begun to be exploited and utilized. Due to the high gangue content of these iron ores, and it is difficult to increase the iron grade or reduce the gangue content through conventional beneficiation techniques, the utilization of these complex iron ores is greatly restricted. Among them, high-silicon iron ore (also known as high-silicon red iron ore) is a common refractory low-quality iron ore. In some provinces in southern China (such as Hainan Province), this type of high-silicon iron ore is more common (Hainan mine Ye, 1 ...

Claims

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Application Information

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IPC IPC(8): C21B13/10C21B13/12C21B13/14C22B1/244
CPCC21B13/0006C21B13/10C21B13/12C21B13/14C22B1/244
Inventor 唐惠庆秦艳齐付秀峰董志磊
Owner UNIV OF SCI & TECH BEIJING
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