Method for reducing manganese oxide by internal-heat rotary kiln

An internal heating rotary kiln and manganese oxide technology, applied in the field of internal heating rotary kiln reduction of manganese oxide, can solve the problems of large investment, complex equipment structure, high energy consumption, etc., and achieve low energy consumption, accurate process control, and stable product quality Effect

Inactive Publication Date: 2011-04-13
陈德根 +2
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Problems solved by technology

At present, the reduction of manganese oxide ore by rotary kiln at home and abroad adopts the external heating method, that is, the material is heated by electricity outside the rotary kiln. This method has high energy consumption, complex equipment structure and large investment.

Method used

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Examples

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Embodiment Construction

[0006] The design output of this embodiment is an annual output of 30,000 tons. First, the manganese oxide ore is crushed and mixed with coal powder in a ratio of 1:0.15, and sent to the drying kiln using the waste heat of the rotary kiln to dry the water, and then the dried material is continuously sent to the ground at an inclination of 3-5 degrees. In the installed rotary kiln with a diameter of 2.4 meters and a length of 30 meters, it is heated and burned with a multi-channel pulverized coal burner, and the temperature is controlled between 800-900 ° C. According to the reduction rate, the rotary kiln is controlled at a speed of 15 Between -50 rpm, in the reducing atmosphere in the kiln, the manganese oxide ore is roasted and reduced for 3-8 hours. Between 50-70°C, it is sent to a ball mill to be ground into a powder of more than 90 mesh for use in the production of electrolytic manganese.

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Abstract

The invention relates to a method for reducing manganese oxide by an internal-heat rotary kiln. The method comprises the following steps: crushing manganese oxide and mixing the crushed manganese oxide with pulverized coal according to a certain proportion; transferring the obtained mixed material into a rotary kiln which is arranged aslant; heating and igniting the mixed material in the rotary kiln by using a pulverized coal burner with multiple air channels, keeping the temperature of 800-900 DEG C, roasting for 3-8 hours, and cooling the material to the temperature of 40-70 DEG C; and polishing the material into powder with over 90 meshes with a ball mill for producing electrolytic manganese. The method for reducing a manganese oxide ore has the advantages of high reduction rate up to over 95%, low energy consumption, accurate process control and stable product quality; and the reduced manganese oxide ore can replace a manganese carbonate ore for producing electrolytic manganese metal.

Description

technical field [0001] The invention relates to a method for reducing manganese oxide in an internal heating type rotary kiln. Background technique [0002] In the past, manganese carbonate ore was used as raw material for electrolytic manganese metal, which accounts for 98% of the world's production capacity. However, manganese resources on the earth mainly exist in the state of oxidation, and manganese oxides must be reduced to form H 2 SO 4 react. At present, all domestic and foreign methods of reducing manganese oxide ore with rotary kilns adopt the external heating method, that is, the materials are heated by electricity outside the rotary kiln. This method has high energy consumption, complex equipment structure and large investment. Contents of the invention [0003] The object of the present invention is to provide a method for reducing manganese oxide in an internal heating rotary kiln with low energy consumption and simple equipment. [0004] In the present i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B47/00
Inventor 陈德根张静高中友
Owner 陈德根
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