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Method for realizing dephosphorization of olitic high-phosphorus iron ore by use of biomass charcoal

A biomass charcoal and high-phosphorus iron ore technology is applied in the fields of iron and steel metallurgy - non-blast furnace ironmaking and metallurgy, which can solve the problems of difficult industrialization and lack of high-quality reducing gas sources, and achieve the effect of short production cycle and high efficiency

Active Publication Date: 2013-09-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are the following disadvantages for magnetic separation and phosphorus removal after metallized pellets are crushed: (1) The apatite layer and hematite layer in oolitic pyrite have an onion-like structure, and the metallized pellets must be ground It is possible to separate apatite from metallic iron only when the particle size is extremely fine; (2) At high temperature (above 1250°C), part of the phosphorus reduction has already entered the metallic iron phase from the gangue phase
(Journal of Iron and Steel Research International, 17(2010): 1-6) However, due to the lack of high-quality reducing gas sources in China, its industrialization is difficult

Method used

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  • Method for realizing dephosphorization of olitic high-phosphorus iron ore by use of biomass charcoal
  • Method for realizing dephosphorization of olitic high-phosphorus iron ore by use of biomass charcoal
  • Method for realizing dephosphorization of olitic high-phosphorus iron ore by use of biomass charcoal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) Charcoal modification: 110g of charcoal is ball-milled, and its average particle size is less than 100μm; at 40°C, the concentration of 200g / L Na 2 CO 3 The aqueous solution is evenly sprayed on the surface of the charcoal powder according to the ratio of 10mL / (100g charcoal), and the charcoal powder is dried in the air atmosphere at 120°C for 1 hour;

[0062] (2) Mineral crushing: take 500g of the above-mentioned oolitic high-phosphorite iron ore for preliminary crushing and after full ball milling, the average particle size will reach less than 100μm;

[0063] (3) Pellet preparation: Mix the above-mentioned iron ore powder, treated charcoal powder and a certain amount of CaO, and the amount of CaO added meets the requirement of CaOwt% / SiO 2 The wt% is 1.0; the mixed material is made into pellets with a diameter of 10.0mm. The ball-making binder adopts 2.0wt% waste paper pulp;

[0064] (4) Dry the pellets at 300°C for 2 hours;

[0065] (5) Direct reduction: Red...

Embodiment 2

[0070] (1) Charcoal modification: 110g of charcoal has been ball milled, and its particle size is less than 100μm; the concentration of 200g / L Na 2 CO 3 Aqueous solution (water temperature 40°C), according to the proportion of 20mL / 100g charcoal evenly sprayed on the surface of charcoal powder, charcoal powder at 120°C, in the air atmosphere, dry for 1h;

[0071] (2) The remaining steps are the same as Example 1.

[0072] The metallization rate of metallized pellets obtained by reduction is 86%, and the residual carbon content is 0.52wt%. The phosphorus content of the final molten iron obtained by melting is 0.24wt%, and the metal recovery rate is 82%.

Embodiment 3

[0074] Change the direct reduction conditions (step (3)), and the rest of the steps are the same as in Example 1. The direct reduction conditions in this example are: using a well-type isothermal furnace, the reduction temperature is 1100°C, the reduction time is 25min, and CO / CO 2 Mixed gas 1L / min to keep the furnace atmosphere at P CO2 / P CO =1.0.

[0075] The metallization rate of the metal pellets obtained after reduction is 80%, the residual carbon content of the metallized pellets is 0.37wt%; the phosphorus content of the final molten iron obtained by melting is 0.20wt%, and the metal recovery rate is 75%.

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Abstract

The invention discloses a method for realizing dephosphorization of olitic high-phosphorus iron ore by use of biomass charcoal, which realizes direct preparation of low-phosphorus liquid iron by combining direct reduction and high-temperature scrap iron separation. The method comprises the following steps of: preparing high-gasification biomass charcoal; breaking the ore charge; preparing carbon addition-lack carbon-containing pellets; performing direct reduction; and performing high-temperature melting. Compared with the existing method for treating olitic high-phosphorus iron ore, the method disclosed by the invention prepares the carbon addition-lack carbon-containing pellets by taking the widely-available and low-price biomass charcoal as a reducing agent and performs direct reduction in a CO / CO2 mixed atmosphere, and obtains low-carbon residue high-metallization pellets by use of the good gasifying performance of the biomass charcoal under the catalysis of Na2CO3; and the reinforcing effect of Na2O on the dephosphorization of liquid iron is obtained by use of Na2CO3 decomposition in a high-temperature scrap iron separation stage. Since the ash content of the biomass charcoal is low, the slag content in a high-temperature melting process is low. The method disclosed by the invention has the characteristics of high iron recovery rate, good dephosphorization effect and the like.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a process for removing phosphorus from oolitic high-phosphorus iron ore, in particular to a process for direct reduction combined with high-temperature slag-iron separation. It belongs to the field of iron and steel metallurgy - non-blast furnace ironmaking. Background technique [0002] China is rich in high-phosphorus oolitic hematite reserves, mainly distributed in Hunan and Hubei provinces, with 3-4 billion tons, accounting for 1 / 9 of my country's iron ore resources. The iron grade of this ore is about 50wt%, which hinders its utilization The main obstacle is that the ore has a very high phosphorus content, up to 1.4wt%. The main types of minerals are hematite, dolomite, plagiochlorite, quartz and apatite (fluorine or hydroxyapatite), and phosphorus is mainly represented by apatite (hydroxyapatite or fluoroapatite) ) form; part of this kind of apatite is filled in the middle of oolit...

Claims

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Application Information

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IPC IPC(8): C21B13/00C22B1/02
Inventor 唐惠庆马龙范立强郭占成
Owner UNIV OF SCI & TECH BEIJING
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