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Heat recovering and microwave reducing manganesian ore roasting process and apparatus

A technology of process equipment and roasting process is applied in the field of microwave reduction roasting process and equipment of heat recovery type manganese oxide ore to achieve the effects of large production capacity, reduced energy consumption, and elimination of smoke and dust

Active Publication Date: 2007-03-21
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 2. Subsequent cooling and waste heat utilization after reduction roasting: the manganese oxide ore after reduction roasting needs to be cooled to a certain temperature under the premise of isolating the air to ensure that it will not be re-oxidized
In the laboratory, after roasting, it can be poured directly with water for forced cooling, but in industrial production, due to the follow-up process and operability requirements, it is impossible to use direct water pouring, and a reasonable follow-up forced cooling method must be studied, and fully Use waste heat to reduce heat loss
[0010] 3. Industrial production requires continuous, balanced reduction and roasting of manganese oxide ore with large processing capacity; however, general microwave devices cannot fully meet these requirements, and a suitable microwave heating device must be designed

Method used

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  • Heat recovering and microwave reducing manganesian ore roasting process and apparatus
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  • Heat recovering and microwave reducing manganesian ore roasting process and apparatus

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. Verification experiment

[0058] 1. Purpose of the experiment: To further examine the extent to which microwave equipment can achieve industrial reduction roasting of manganese ore powder, and to explore the reaction conditions and main influencing factors of microwave reduction roasting.

[0059] 2. Experimental equipment and experimental objects

[0060] a. Instruments: industrial microwave roasting furnace for experiment (10kw), precision electronic balance, calculator, hand-held high-precision infrared thermometer (range 0℃~500℃), Prussian brand online high-precision infrared thermometer (range 0℃~900℃), corundum mullite furnace (225mm×145mm×145mm), alumina insulation cotton, sample sealed tank.

[0061] b. Raw materials: Guangxi Daxin Manganese Mine metallurgical slag, Guangxi Daxin Manganese Mine production and use of anthracite powder.

[0062] 3. Roasting reduction process parameters:

[0063] The set experimental conditions are as follows: the roasting te...

Embodiment 2

[0071] The roasting equipment is HWS-18 rotary microwave oven.

[0072] The experimental method is: weighing → mixing → loading and roasting → sampling and forced cooling → sample analysis

[0073] Experimental process: The raw material is divided into 17 samples, each of which is 10 or 20 kg, and the coal mine ratio is 14% or 18%. Under the condition that other process parameters are basically the same, when the microwave heats the material from room temperature to 150°C, it needs to consume about 100 degrees of electricity, and the power consumption in this temperature range accounts for an average of 33% of the total power consumption of roasting; heating to 200°C, 250°C At 300°C, the power consumption of each temperature section accounted for 53%, 68% and 80% of the average value of the total power consumption of roasting respectively. It is generally estimated that using microwaves to roast and reduce manganese ore powder requires approximately 210 to 240 degrees of elec...

Embodiment 3

[0080] for an intermediate test.

[0081] The roasting furnace is a shaft furnace with continuous feeding and discharging. Due to limited conditions, artificial mixing, feeding and star valve mechanical unloading are adopted, without forced water cooling device.

[0082] The hearth of the roasting furnace is 150mm wide and 0.176m in volume 3 . There are 8 groups of microwave generators totaling 189 microwave units. Due to insufficient power supply voltage, only 3 groups of microwave generators can be turned on during the experiment, and the actual power used is 48KW.

[0083] The experimental raw materials are metallurgical manganese powder and anthracite coal powder from Daxin manganese mine.

[0084] experiment procedure:

[0085] Experiment 1: Metallurgical manganese powder 500kg, anthracite coal powder 50kg; after mixing, put it into the roasting furnace for roasting, after the roasting is completed, it is unloaded by the star discharge machine, and the sample is natur...

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Abstract

The heat recovering and microwave reducing manganesian ore roasting process adopts microwave heating furnace for reducing and roasting manganesian ore and has the afterheat recovered by means of hot blast circulation technology. The technological parameters include the weight ratio between reducing coal and manganesian ore of 15 %-18 %, most ore powder size smaller than 100 mesh, reducing roasting temperature of 380-450 deg.c, reducing roasting reaction time not less than 5 min, and material outlet temperature not higher than 80 deg.c. The technological apparatus includes heating microwave oven, preheating bin over the microwave oven, cooling bin below the microwave oven and hot blast pipeline between the preheating bin and the cooling bin. The present invention can reach reducing rate not lower than 92 %, coal consumption not higher than 180kg / ton ore, and total power consumption not higher than 140kw.h / ton ore.

Description

technical field [0001] The invention relates to the field of technology and equipment for reducing and roasting manganese oxide ore and recovering waste heat by adopting microwave technology. Background technique [0002] The reduction roasting of manganese oxide ore is an important link in the deep processing of manganese ore. The reduction roasting equipment used in the current industrial production mainly includes reverberatory furnaces, shaft furnaces, rotary kilns, and fluidized roasting furnaces. Among the above furnaces, the reverberatory furnace has high heat consumption, low production efficiency, harsh working conditions, and serious environmental pollution. The new industry standard in my country has explicitly prohibited its use; the shaft furnace is suitable for a small range of mineral particle size, poor ore permeability, and unsatisfactory reduction effect ;The rotary kiln has high energy consumption, the heating body (nickel-chro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B5/10C22B47/00
Inventor 黎贵亮邓永光李维健黄柄行黄柄龙
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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