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Silicon-chromium alloy production method and system

A technology of silicon-chromium alloy and mixed materials, which is applied in the field of ferroalloy, can solve the problems that the industrial production of silicon-chromium alloy cannot be realized, and achieve the effects of reducing the difficulty of operation technology, improving the recovery of chromium metal, and reducing power consumption

Pending Publication Date: 2017-11-24
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's chrome ore mainly comes from imports. Among the imported chrome ore, fine ore accounts for more than 70%, and lump ore only accounts for about 30%. Moreover, not all lump ore sizes are suitable. Due to the limitation of raw material conditions, my country has been unable to Realize the one-step industrial production of silicon-chromium alloy

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  • Silicon-chromium alloy production method and system
  • Silicon-chromium alloy production method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The ratio of chromium to iron is 1.30, MgO / Al 2 o 3 100 parts of chromium concentrate powder of 1.00, 27 parts of blue charcoal powder (the molar weight of fixed carbon is 1.3 times of the molar weight of oxygen in iron oxide and chromium oxide in chromium concentrate powder), 20 parts of dolomite, 2 parts of bentonite 1 part of starch and 8 parts of water are mixed in a mixer and pelletized after mixing. Roasting, the reducing calcination temperature is 1400°C, the comprehensive metallization rate of the pellets after calcination is about 60%, and the compressive strength of the pellets after calcination is about 550N / ball. Put 100 parts of roasted pellets together with 40 parts of coke and 80 parts of silica into an electric furnace for smelting. After smelting, a silicon-chromium alloy with a chromium content of 35.18% and a silicon content of 35.02% can be obtained. Compared with the traditional process, the power consumption of smelting is reduced. The chromium r...

Embodiment 2

[0070] The ratio of chromium to iron is 1.88, MgO / Al 2 o 3 100 parts of 1.72 chromium concentrate powder, 23 parts of coke powder (the molar weight of fixed carbon is 1.4 times of the molar weight of oxygen in iron oxide and chromium oxide in chromium concentrate powder), 5 parts of dolomite, 4 parts of bentonite , 1.2 parts of starch and 11 parts of water are mixed in a mixer, and then pelletized after mixing. The particle size of the pellets is 8-10mm. The obtained wet pellets are dried at about 100-150°C, and the pellets are reduced and roasted after drying. , the reduction roasting temperature is 1450°C, the comprehensive metallization rate of the pellets after roasting is about 70%, and the compressive strength of the pellets after roasting is about 500N / ball. Put 100 parts of roasted pellets together with 50 parts of coke and 100 parts of silica into an electric furnace for smelting. After smelting, a silicon-chromium alloy with a chromium content of 36.05% and a silico...

Embodiment 3

[0072] The ratio of chrome to iron is 1.50, MgO / Al 2 o 3100 parts of chromium concentrate powder of 1.20, 27 parts of blue charcoal powder (the molar weight of fixed carbon is 1.3 times of the molar weight of oxygen in iron oxide and chromium oxide in chromium concentrate powder), 15 parts of dolomite, 8 parts of bentonite , 10 parts of water are mixed in the mixer, and after mixing, pelletizing is carried out. The particle size of the pellets is 10-30mm. The obtained wet pellets are dried at about 100-150°C. After drying, the pellets are reduced and roasted. The reduction roasting temperature The temperature is 1500°C, the comprehensive metallization rate of the pellets after calcination is about 78%, and the compressive strength of the pellets after calcination is about 450N / ball. Put 100 parts of roasted pellets together with 60 parts of coke and 120 parts of silica into an electric furnace for smelting. After smelting, a silicon-chromium alloy with a chromium content of 3...

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Abstract

The invention discloses a silicon-chromium alloy production method. The method comprises the following steps of (1) mixing chromium concentrate powder and reducing agent powder with a binding agent and water evenly to obtain a mixture; (2) conducting pellet pressing and pelletizing treatment on the mixture for mixture molding to obtain molded pellets; (3) drying the molded pellets to obtain dried pellets; (4) conducting reduction roasting to obtain roasted pellets; and (5) adding the roasted pellets, silica and coke into an electric furnace for deep reduction, and obtaining silicon-chromium alloy. The invention further discloses a silicon-chromium alloy production system. The silicon-chromium alloy production system comprises a mixing device, a pelletizing device, a green pellet screening device, a drying device, a rotary hearth furnace device, a feeding device and an electric furnace device. According to the silicon-chromium alloy production method and system, the silicon-chromium alloy is produced by using the chromium concentrate powder; the technical difficulty of smelting operation of the silicon-chromium alloy is reduced; compared with a traditional silicon-chromium alloy two-step method (high-carbon ferro-chrome and silicon-chromium), the power consumption for smelting of the silicon-chromium alloy is reduced by 1%-7%; and the chromium metal recovery rate of silicon-chromium alloy smelting is increased by 3%-5%.

Description

technical field [0001] The invention relates to the field of ferroalloys, in particular to a method and system for producing ferrosilicon alloys. Background technique [0002] Silicon-chromium alloy is an indispensable reducing agent for the production of medium, low and micro-carbon ferrochrome by electrosilicothermal method. There are two methods for producing silicon-chromium alloys: one-step method (with slag method) and two-step method (without slag method). The one-step method is to add chromium ore, silica and coke directly into an electric furnace for smelting. The first step of the two-step method is to add chromium ore and coke to the first electric furnace to smelt high-carbon ferrochrome, and the second step is to add high-carbon ferrochrome blocks together with silica and coke to the second electric furnace to smelt silicon chrome. At present, my country mainly adopts the two-step method in industrial production, and the one-step method has only been tested i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02C22B5/10C22B34/32
CPCC22B1/2406C22B1/02C22B5/10C22B34/32
Inventor 陈佩仙任中山经文波闫方兴徐刚曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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