Unlock instant, AI-driven research and patent intelligence for your innovation.
Method for realizing dephosphorization of olitic high-phosphorus iron ore by use of biomass charcoal
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A biomass charcoal and high-phosphorus iron ore technology, which is applied in the fields of metallurgy, iron and steel metallurgy and non-blast furnace ironmaking, can solve the problems of lack of high-quality reducing gas source and difficulty in industrialization, and achieve the effect of short production cycle and high efficiency.
Inactive Publication Date: 2015-02-25
UNIV OF SCI & TECH BEIJING
View PDF5 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
In addition, there are the following disadvantages for magnetic separation and phosphorus removal after the metallized pellets are crushed: (1) the onion-like structure of the apatite layer and the hematite layer in the oolitic phosphoferite must be separated by metallized pellets It is possible to separate the apatite from metallic iron only when the ball is ground to a very fine particle size (Journal of Process Engineering, 11(2011), 599-605); (2) At high temperature (above 1250°C), part of the phosphorus has been reduced from Gangue phase enters metallic iron phase (ISIJ International, 51(2011), No.2, pp.220–227)
However, in China, due to the lack of high-quality reducing gas sources, its industrialization is difficult
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0060] (1) Charcoal modification: 110g of charcoal has been 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 charcoal powder according to the ratio of 10mL / (100g charcoal), and then the charcoal powder is dried in air atmosphere at 120°C for 1h;
[0061] (2) Mineral material crushing: take 500g of the above-mentioned oolitic ferrophosphorite for preliminary crushing and after being fully ball-milled, its average particle size is less than 100 μm;
[0062] (3) Pellet preparation: the above-mentioned iron ore powder and charcoal powder after treatment and a certain amount of CaO are mixed, and the CaO addition satisfies the CaOwt% / SiO 2 The wt% is 1.0; the material after mixing is made into pellets with a diameter of 10.0 mm. The ball-making binder adopts 2.0wt% waste paper pulp;
[0063] (4) Dry the pellets at 300°C for 2 hours;
[0064] (5) Direct reduction...
Embodiment 2
[0069] (1) Charcoal modification: 110g of charcoal has been ball milled, and its average particle size is less than 100μm; the concentration of Na is 200g / L 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 air atmosphere, dry for 1h;
[0070] (2) All the other steps are the same as Example 1.
[0071] The metallization rate of the 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
[0073] Change direct reduction condition (step (5)), all the other steps are with 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 2 / CO mixed gas 1L / min to keep the reducing atmosphere in the furnace at P CO2 / P CO = 1.0.
[0074] 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%.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Property
Measurement
Unit
particle size
aaaaa
aaaaa
thickness
aaaaa
aaaaa
diameter
aaaaa
aaaaa
Login to View More
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's high-phosphorus oolitic hematite reserves are abundant, mainly distributed in Hunan and Hubei provinces, with 3-4 billion tons, accounting for my country's iron ore resources, and the iron grade of this ore is about 50wt%, which is the main obstacle hindering its utilization That is, the ore has a very high phosphorus content, up to 1.4 wt%. 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 ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More