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Reduction roasting method of siderite in rotary kiln

A technology for siderite and rotary kiln is applied in the field of reduction and roasting of siderite rotary kiln, which can solve the problems of low grade of hydrothermal siderite, and achieve the effects of improving technical level, reducing dependence and widening sources.

Inactive Publication Date: 2015-01-07
赫章县黎明矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, my country's iron and steel industry continues to grow at a high speed, and the demand for iron ore is increasing. As the international iron ore price continues to rise, the use of domestic low-grade siderite ore is getting more and more attention. In addition, my country's iron ore The characteristics of ore reserves are that there are many lean ores and few rich ores. The low-grade hydrothermal siderite reserves are large and the distribution is relatively concentrated, which is suitable for mining. However, the grade of the mined hydrothermal siderite is low.

Method used

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  • Reduction roasting method of siderite in rotary kiln
  • Reduction roasting method of siderite in rotary kiln
  • Reduction roasting method of siderite in rotary kiln

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Experimental program
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Effect test

Embodiment 1

[0021] ①Crush 1000kg of Hezhang County hydrothermal siderite into particle size less than or equal to 0.9mm, and 20kg of anthracite into particle size less than or equal to 5mm, and fully mix them into mixed raw material powder.

[0022] ② The mixed raw material powder enters the rotary furnace from the tail section of the rotary kiln, and the combustion gas produced by the gas generator enters the rotary kiln from the front section of the rotary kiln (the speed is 2000m 3 / h), the coal injection machine injects coal powder from the front section of the rotary furnace into the rotary furnace (spray speed is 500kg / h) to roast the mixed raw material powder in the rotary furnace, the rotary furnace speed is 2r / min, and the volume is 2.4m 3 , the installation slope is 5 degrees, the roasting temperature is 650°C-1100°C, the roasting temperature time is 30 minutes, and the exhaust gas is discharged from the rotary kiln through the exhaust channel at the end of the rotary kiln.

[0...

Embodiment 2

[0025] ①Crush 2000kg of Hezhang County hydrothermal siderite into particle size less than or equal to 0.9mm, and 50kg of anthracite into particle size less than or equal to 5mm, and fully mix them into mixed raw material powder.

[0026] ②The mixed raw material powder enters the rotary furnace from the tail section of the rotary furnace, the combustion gas produced by the gas generator enters the rotary furnace from the front section of the rotary furnace (the speed is 2000m3 / h), and the coal injection machine injects coal powder into the rotary furnace from the front section of the rotary furnace (Spray speed is 500kg / h) Roast the mixed raw material powder in the rotary kiln, the rotary kiln speed is 2r / min, the volume is 2.4m 3 , the installation slope is 5 degrees, the roasting temperature is 650°C-1100°C, the roasting temperature time is 30 minutes, and the exhaust gas is discharged from the rotary kiln through the exhaust channel at the end of the rotary kiln.

[0027] ③T...

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Abstract

The invention discloses a reduction roasting method of siderite in a rotary kiln. The method comprises steps as follows: 1, hydrothermal siderite is crushed into particles with particle size smaller than or equal to 0.9 mm, blind coal is crushed into particles with particle size smaller than or equal to 5 mm, and the particles are sufficiently mixed to form mixed raw material powder; 2, the mixed raw material powder enters the rotary kiln from the tail section of the rotary kiln, burning gas generated by a gas generator enters the rotary kiln from the front section of the rotary kiln, a coal powder injection device injects coal powder from the front section of the rotary kiln, the mixed raw material powder in the rotary kiln is roasted at the roasting temperature ranging from 650 DEG C to 1,100 DEG C for 30 min, and tail gas is discharged out of the rotary kiln from an exhaust passage at the tail section of the rotary kiln; and 3, iron ore powder roasted in the rotary kiln is discharged to a cooling pond from the front section of the rotary kiln for water quenching, so that the finished product of the iron ore powder is obtained. Compared with the prior art, the grade of the iron ore powder roasted with the reduction roasting method of siderite in the rotary kiln is stable.

Description

technical field [0001] The invention relates to smelting of siderite, in particular to a method for reducing and roasting siderite in a rotary kiln. Background technique [0002] In recent years, my country's iron and steel industry continues to grow at a high speed, and the demand for iron ore is increasing. As the international iron ore price continues to rise, the use of domestic low-grade siderite ore is getting more and more attention. In addition, my country's iron ore The ore reserves are characterized by more lean ore and less rich ore. The low-grade hydrothermal siderite reserves are large and the distribution is relatively concentrated, which is suitable for mining. However, the grade of the mined hydrothermal siderite is low. The invention is located in Hezhang County, Guizhou Province, and has the characteristics of large hydrothermal siderite reserves, special products, rich magnesium oxide, calcium, etc., and extremely low harmful elements. It has a high value ...

Claims

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Application Information

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IPC IPC(8): C22B1/02
CPCC22B1/02
Inventor 陈小众
Owner 赫章县黎明矿业有限公司