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System and method for treating siderite

A technology of siderite and rotary hearth furnace, applied in the field of smelting, can solve the problems of density, low specific magnetic susceptibility, poor selectivity, etc., and achieve the effects of sufficient magnetization, low cost and low energy consumption

Inactive Publication Date: 2017-02-15
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of its low density and specific magnetic susceptibility, and many siderites often coexist with gangue minerals with similar density and specific magnetic susceptibility to chlorite and garnet, the selectivity is poor.

Method used

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  • System and method for treating siderite
  • System and method for treating siderite
  • System and method for treating siderite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Grind a certain siderite ore until the particle size of 86.32% mass ratio is ≤200 mesh, make pellets (pellets with a particle size of 8-12mm), and enter from the feed port of the rotary hearth furnace after drying. The arc of the magnetization roasting area of ​​the rotary hearth furnace is 130 °, the temperature is controlled at 500°C, the temperature in the reduction roasting zone is controlled at 1250°C, and the bottom of the furnace rotates for 2 hours. When the dry pellets after magnetization and roasting enter the reduction roasting zone, the reduced coal (mass component of carbon: 82.03%, particle size 2mm) Dry pellets are covered from the reducing agent inlet, and the dry pellets covered with reduced coal are reduced to metallized pellets in the reduction roasting zone and discharged from the discharge port.

Embodiment 2

[0055] Grind a certain siderite ore until the particle size of 88.55% mass ratio is ≤200 mesh, make pellets (pellet particle size 10-14mm), and enter from the feed port of the rotary hearth furnace after drying. The arc of the magnetization roasting area of ​​the rotary hearth furnace is 170 °, the temperature is controlled at 800°C, the temperature in the reduction roasting zone is controlled at 1200°C, and the furnace bottom rotates for 1.5 hours. When the dry pellets after magnetization roasting enter the reduction roasting zone, the reduced coal (mass component of carbon: 80.26%, particle size 3mm ) is covered with dry pellets from the reducing agent inlet, and the dry pellets covered with reduced coal are reduced to metallized pellets in the reduction roasting zone and discharged from the discharge port.

Embodiment 3

[0057] Grind a certain siderite ore until the particle size of 87.45% by mass ratio is ≤200 mesh, make pellets (pellets with a particle size of 10-16mm), and enter from the feed port of the rotary hearth furnace after drying. The arc of the magnetization roasting area of ​​the rotary hearth furnace is 130 °, the temperature is controlled at 700°C, the temperature in the reduction roasting zone is controlled at 1300°C, and the time for one rotation of the furnace bottom is 2.5 hours. ) is covered with dry pellets from the reducing agent inlet, and the dry pellets covered with semi-coke are reduced to metallized pellets in the reduction roasting zone and discharged from the discharge port.

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Abstract

The invention discloses a system and a method for treating siderite. The system comprises an atomizer mill, a pelletizer, a drying device and a rotary hearth furnace, wherein the atomizer mill comprises a discharge hole; the pelletizer comprises a charge hole and a discharge hole; the drying device comprises a charge hole and a discharge hole; and the rotary hearth furnace comprises a charge hole, a discharge hole and a retaining wall. According to the system and the method for treating siderite disclosed by the invention, magnetizing roasting and reducing roasting of materials are integrally completed, so that magnetizing is sufficient and reducing effect is good; sensible heat of magnetized and roasted pellets is sufficiently utilized for reducing and roasting materials, so that energy consumption is small and cost is low; and conditions are created for expanding resource utilization of iron ores.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a system and method for processing siderite. Background technique [0002] In recent years, with the rapid development of the iron and steel industry, my country's development of iron ore resources is intensive, the comprehensive utilization rate is low, and the difficulty of geological exploration is increasing, which makes the iron ore resources with good geological conditions, high resource grade and good sorting ability It is gradually decreasing, the sustainable supply capacity of mineral resources is declining, and the reserve resources are insufficient. Only by actively developing and utilizing refractory iron ore and low-grade iron ore resources can we effectively expand the amount of iron ore resources that can be used industrially in my country and reduce foreign dependence , to ensure the security of iron ore supply. [0003] The crystals of siderite are rh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C21B13/10B02C21/00
CPCC22B1/02B02C21/00C21B13/10
Inventor 徐刚任中山闫方兴曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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