Method for controlling redox atmosphere of rotary kiln

An oxidizing atmosphere and rotary kiln technology, applied in the field of metallurgy, can solve problems such as kiln ring formation, high roasting temperature, and insufficient oxidation of vanadium components, and achieve the effects of avoiding material sintering and reasonable energy utilization

Active Publication Date: 2015-07-01
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to accurately control the reducing atmosphere of the rotary kiln to realize the low-temperature and high-efficiency reduction of vanadium-titanium ore; at the same time, it solves the problems of high roasting temperature, insufficient oxidation of vanadium components, and low vanadium conversion rate in the process of vanadium extraction by fire method problems; and solve the problems of material sintering and kiln body ring formation during the high-temperature roasting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] by Φ Take the 3.5m×90m vanadium slag oxidation and roasting rotary kiln as an example, the initial feeding volume is 20t / h:

[0026] (1) Mix vanadium slag and sodium salt evenly and thoroughly, and enter the rotary kiln from the kiln tail;

[0027] (2) Gas is blown into the kiln head of the rotary kiln, and the wind is drawn from the tail of the rotary kiln to roast the mixed raw material powder in the rotary kiln. The roasting temperature is 650°C, and the roasting time is 5 hours; blower and the same number of burners, the blowing volume is 1000 m 3 / h, blowing air to support combustion, and the exhaust gas is discharged from the rotary kiln through the exhaust channel at the end of the rotary kiln;

[0028] The blowing gas volume in the kiln is 0.5 times of the gas volume; the gas flow rate is 4000m 3 / h, the ratio of raw material feeding amount to 200;

[0029] (3) Inside the kiln body, redox agents are added to the material to extract vanadium tailings, and the...

Embodiment 2

[0033] by Φ Take the 4.5m×100m vanadium slag oxidation and roasting rotary kiln as an example, the initial feeding volume is 25 t / h:

[0034] (1) Mix vanadium slag and sodium salt evenly and thoroughly, and enter the rotary kiln from the kiln tail;

[0035] (2) Gas is blown into the kiln head of the rotary kiln, and the wind is drawn from the tail of the rotary kiln to roast the mixed raw material powder in the rotary kiln. The roasting temperature is 800°C, and the roasting time is 3 hours; 20 blowers and an equal number of blowers are installed on the kiln body. The burner is used to blow air to support combustion, and the exhaust gas is discharged from the rotary kiln through the exhaust channel at the end of the rotary kiln;

[0036] The blowing section is numbered from 1# to 4# from the kiln tail to the kiln head, and 3 blowers are installed on the 1# blowing section, and the blowing volume is 900 m 3 / h, 8 blowers are installed on the 2# blowing section, and the blowin...

Embodiment 3

[0042] by Φ Take the 4.5m×100m vanadium slag oxidation and roasting rotary kiln as an example, the initial feeding volume is 25 t / h:

[0043] (1) Mix vanadium slag and sodium salt evenly and thoroughly, and enter the rotary kiln from the kiln tail;

[0044] (2) Gas is blown into the kiln head of the rotary kiln, and air is drawn from the tail of the rotary kiln to roast the mixed raw material powder in the rotary kiln. The roasting temperature is 850°C and the roasting time is 2.5 hours; 5 blowers and an equal number of blowers are installed on the kiln body. The burner is used to blow air to support combustion, and the exhaust gas is discharged from the rotary kiln through the exhaust channel at the end of the rotary kiln;

[0045] The blowing section is numbered from 1# to 3# from the kiln tail to the kiln head, and a blower is installed on the 1# blowing section, and the blowing volume is 600 m 3 / h, 3 blowers are installed on the 2# blowing section, and the blowing volume ...

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Abstract

The invention discloses a method for controlling redox atmosphere of a rotary kiln. The method comprises the following steps of (1) fully mixing raw materials, putting the mixture from the tail of a kiln into a rotary kiln; (2) blowing gas from the head of the rotary kiln, inducing air from the tail of the rotary kiln, calcining mixed raw material powders in the rotary kiln, wherein air blowers and nozzles with the same quantity with the air blowers are installed in the kiln body to blow air and assist combustion, and exhausting tail gas from an exhaust air duct of the rotary kiln tail outside the rotary kiln; (3) mixing an oxidation-reduction agent into the materials within the kiln body to control the redox atmosphere; adjusting and controlling the thickness of the material layer, and controlling the structure of the material layer; and (4) discharging the raw materials calcined in the rotary kiln, obtaining the product. The method provided by the invention can be used for enabling energy utilization to become more reasonable; high efficient oxidization conversion of vanadium and iron can be realized, and about 10 percent is increased compared with the prior art; and meanwhile, the phenomena such as material sintering and kiln ring forming produced in calcining process can be avoided.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for controlling the redox atmosphere of a rotary kiln. Background technique [0002] China's Panzhihua-Xichang area and Chengde area are rich in vanadium-titanium magnetite resources, which contain iron, titanium, vanadium and some other associated metals. The comprehensive utilization of resources has always been a research topic for scientific researchers. The traditional "blast furnace-converter" process for smelting vanadium-titanium iron concentrate can only recover iron and vanadium, while the comprehensive recovery rate of vanadium is low (about 40%), and titanium is discarded in blast furnace slag and cannot be used. The efficiency is low and the waste is huge, which seriously restricts the sustainable development of the titanium industry. In recent years, the third-generation smelting technology "direct reduction-electric furnace melting" process has develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B34/22
Inventor 白瑞国李兰杰陈东辉
Owner HEBEI IRON AND STEEL
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