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Ferro-manganese oxidized ore fluid bed roasting system and method

A technology for fluidized roasting and iron-manganese oxide ore, applied in the fields of metallurgy and mineral processing, can solve the problems of lack of high-efficiency and low-consumption fluidized bed roasting system, avoid secondary oxidation and roasting process failure, high magnetic separation Recovery, effect of sufficient reaction residence time

Active Publication Date: 2020-04-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, there is still a lack of high-efficiency and low-consumption fluidized bed roasting system solutions that comprehensively consider the reduction characteristics of iron and manganese oxides in associated ores.

Method used

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  • Ferro-manganese oxidized ore fluid bed roasting system and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, a fluidized roasting system for iron-manganese oxide ore includes a feed bin, a dryer, a cyclone preheater, a fluidized roaster, a reducing gas cooler, an indirect water cooler and a discharge bin.

[0038] Described dryer comprises tail gas burner 13, Venturi airflow dryer 2, dry cyclone separator 3 and bag filter 4, and described cyclone preheater comprises two-stage preheating cyclone; Described fluidized roaster comprises The roasting furnace body 7 and the roasting cyclone separator 8; the reducing gas cyclone wind cooler includes a multi-stage reducing gas cooling cyclone; wherein, the discharge port of the feed bin 1 is connected with the feed port of the Venturi airflow dryer 2, and the venturi The air outlet at the top of the airflow dryer 2 is connected to the air inlet of the drying cyclone separator 3, the air outlet at the top of the drying cyclone separator 3 is connected to the air inlet of the bag filter 4, and the outlet at th...

Embodiment 2

[0048] Adopt the fluidized roasting system of above-mentioned iron-manganese oxide ore to carry out the fluidized roasting method of iron-manganese oxide ore as follows:

[0049] The iron-manganese oxide ore powder is stored in the feed bin and enters the Venturi air dryer to be dehydrated and dried by the hot flue gas, and then separated from the gas and solid by the drying cyclone separator. The dried ore powder after gas-solid separation and the dust collected by the bag filter The dry ore powder enters the cyclone preheater together. In the multi-stage preheating cyclone, the ore powder and the hot tail gas of the roaster undergo gas-solid countercurrent heat exchange to raise the temperature. The heated hot mineral powder enters the roaster body and the reducing gas for hematite phase The magnetization roasting reaction and the reduction reaction of manganese dioxide, the reduced ore powder entrained by the air flow is separated from the gas and solid by the roasting cyclo...

Embodiment 3

[0052] The present invention is used to process iron-manganese co-associated oxide ore powder with iron grade TFe of 40.2% and manganese grade TMn of 19.7%, with a particle size of 0.037-1mm, of which 0.074mm accounts for 20%. Iron oxide in ore powder is hematite phase Fe 2 o 3 Existence, manganese oxide as manganese dioxide phase MnO 2 exist. Free water content 10%.

[0053] First, the fine ore is sent from the silo to the Venturi air dryer to be dehydrated and dried by the hot flue gas. After drying, the temperature of the hot flue gas tail gas is 120°C, and the free water content of the fine ore after dehydration is less than 1%. The powdered ore then goes through the two-stage cyclone preheater to exchange heat with the reduction tail gas to raise the temperature, and then enters the turbulent fluidized bed at 520°C for magnetization reduction roasting with producer gas for 30 minutes. Producer gas composition is 20%CO+11%CO 2 +17%H 2 +1%CH 4 +48%N 2 +5%H 2 O. Re...

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Abstract

The invention discloses a ferro-manganese oxidized ore fluid bed roasting system and method. The system comprises a feeding bin, a dryer, a cyclone preheater, a fluid bed roasting furnace, a reducinggas cooler, an indirect water cooler and a discharging bin. The method comprises the steps that 1, mineral powder is dehydrated through the dryer from the feeding bin; 2, the dried mineral powder is preheated and heated through the cyclone preheater; 3, the hot mineral powder is subjected to low-temperature fluidization magnetization reduction calcination; 4, reducing ore is subjected to two-section anaerobic heat exchange cooling through the reducing gas cooler and the indirect water cooler and then subjected to low-intensity magnetic separation. The system and method have the advantages thatferro-manganese oxidized ore low-temperature efficient magnetization reduction is performed, the ferric oxide phase magnetic susceptibility and the manganite phase reducing susceptibility are high, sensible heat is effectively utilized, and energy consumption is low, and the purpose of efficiently separating and utilizing ferro-manganese ferro-manganese interdependent resources in ferro-manganeseoxidized ore can be achieved.

Description

technical field [0001] The invention belongs to the field of mineral processing and metallurgy, and in particular relates to a fluidized roasting system and method for iron-manganese oxide ore. Background technique [0002] With the rapid development of my country's economy, high-quality manganese ore and iron ore resources are consumed by basic industries and are increasingly scarce. However, a large number of low-grade iron-manganese symbiotic ore resources in my country have not yet realized the effective separation and utilization of large-scale iron and manganese resources. At the same time, in recent years, my country has imported a large number of iron-manganese symbiotic ores from abroad. Compared with traditional manganese ores, their iron content is higher, which also limits their extensive use of alternative manganese ore resources. Generally speaking, iron-manganese symbiotic ores are mostly high-valent metal oxide ores, and iron minerals in raw ore are mostly r...

Claims

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Application Information

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IPC IPC(8): C22B1/10
CPCC22B1/10
Inventor 孙昊延朱庆山王珍谢朝晖
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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