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Device and method for decomposing rare earth ore through sulfuric acid low-temperature dynamic roasting

A rare earth ore and sulfuric acid technology, applied in the field of rare earth ore roasting and decomposition, can solve the problems of energy saving and emission reduction, environmental pollution, high investment in exhaust gas treatment equipment, and high sulfuric acid fumes content, so as to save auxiliary material consumption, less floor space, The effect of less investment in equipment

Active Publication Date: 2012-07-04
广西域潇西骏稀土功能材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of the times and technology, the industry generally believes that this method still has the following disadvantages: (1) The problem of sticking to the kiln during the material roasting process can only be solved by excessive sulfuric acid or external force cleaning, and the consumption of sulfuric acid is 1.2 to 1.5 theoretically. (2) In order to achieve the decomposition rate, a high temperature of 800°C to 1000°C must be used, which consumes a lot of energy, generally 300 to 500 kg of standard coal per ton of concentrate, and in some places it reaches more than 600 kg; (3) due to sulfuric acid Large consumption, high temperature, high content of sulfuric acid fumes in the tail gas, high temperature, and difficult treatment. Although some places meet environmental protection requirements, the investment in tail gas treatment equipment is high, and the environmental pollution problem is difficult to solve
The use of rotary kiln sulfuric acid high temperature treatment method has been difficult to meet the current status of energy saving and environmental pollution reduction

Method used

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  • Device and method for decomposing rare earth ore through sulfuric acid low-temperature dynamic roasting
  • Device and method for decomposing rare earth ore through sulfuric acid low-temperature dynamic roasting
  • Device and method for decomposing rare earth ore through sulfuric acid low-temperature dynamic roasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Step 1, through the continuous quantitative feeder 2 and the sulfuric acid flow meter 7 to control the addition of rare earth ore and sulfuric acid, the rare earth ore to be decomposed and concentrated sulfuric acid with a mass concentration of more than 93% are added to the double helix at a mass ratio of 1:1 In the continuous mixer 3, fully mix to form a semi-dry bulk material;

[0046] Step 2: Add the material described in step 1 into the kiln body 4 through the feeding pipe 8, adjust the temperature in the kiln body to 200°C through the combustion chamber 5, and adjust the residence time of the material to 4 hours at the same time through the turning rate of the material turning system 10 , so that the material is fully decomposed, and the decomposed material is discharged into the immersion tank through the discharge pipe 11 for subsequent processing; the combustion chamber 5 uses gas as fuel;

[0047] Step 3: The exhaust gas produced by roasting and decomposing ra...

Embodiment 2

[0050] Step 1, through the continuous quantitative feeder 2 and sulfuric acid flow meter 7 to control the addition of rare earth ore and sulfuric acid, the rare earth ore to be decomposed and concentrated sulfuric acid with a mass concentration of more than 93% are added to the double helix at a mass ratio of 1.5:1 In the continuous mixer 3, fully mix to form a semi-dry bulk material;

[0051] Step 2: Add the material described in step 1 into the kiln body 4 through the feeding pipe 8, adjust the temperature in the kiln body to 600°C through the combustion chamber 5, and adjust the residence time of the material to 2 hours at the same time through the turning rate of the material turning system 10 , so that the material is fully decomposed, and the decomposed material is discharged into the immersion tank through the discharge pipe 11 for subsequent processing; the combustion chamber 5 uses natural gas as fuel;

[0052] Step 3: The exhaust gas produced by roasting and decompos...

Embodiment 3

[0055] Step 1, through the continuous quantitative feeder 2 and the sulfuric acid flow meter 7 to control the addition of rare earth ore and sulfuric acid, the rare earth ore to be decomposed and concentrated sulfuric acid with a mass concentration of more than 93% are added to the double helix at a mass ratio of 1.2:1 In the continuous mixer 3, fully mix to form a semi-dry bulk material;

[0056] Step 2: Add the material described in step 1 into the kiln body 4 through the feeding pipe 8, adjust the temperature in the kiln body to 400°C through the combustion chamber 5, and adjust the residence time of the material to 3 hours at the same time through the turning rate of the material turning system 10 , so that the material is fully decomposed, and the decomposed material is discharged into the immersion tank through the discharge pipe 11 for subsequent processing; the combustion chamber 5 uses bituminous coal as fuel;

[0057] Step 3: The exhaust gas produced by roasting and ...

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Abstract

The invention discloses a device for decomposing rare earth ore through sulfuric acid low-temperature dynamic roasting, which comprises a sulfuric acid low-temperature dynamic roasting kiln, and a high voltage constant-current tail gas liquefying treatment system which is communicated with the sulfuric acid low-temperature dynamic roasting kiln and purifies flue gas output by the sulfuric acid low-temperature dynamic roasting kiln, wherein the sulfuric acid low-temperature dynamic roasting kiln comprises a raw material storage tank, a sulfuric acid storage tank, a double-screw continuous mixer, a kiln body, a material stirring system arranged at the bottom of the kiln body, and a combustion chamber arranged outside the kiln body; and the high voltage constant-current tail gas liquefying treatment system comprises a cooling tower, a high voltage constant-current tail gas liquefying tower, a high-efficiency cyclone separator, an exhaust fan, and a foam tower. The invention also discloses a method for decomposing rare earth ore through sulfuric acid low-temperature dynamic roasting by the device. The device and the method has wide adaptability for decomposing minerals and ensure thatthe decomposition rate is over 96 percent; and the device and the method can ensure that the materials are fully decomposed and the final tail gas meets the emission standard.

Description

technical field [0001] The invention belongs to the technical field of rare earth ore roasting and decomposition, and in particular relates to a device and method for sulfuric acid low-temperature dynamic roasting and decomposition of rare earth ore. Background technique [0002] China is a country rich in rare earth resources. Except for the southern ion-type mines that are leached by wet method, almost the remaining major minerals can be processed by sulfuric acid roasting. At present, the method commonly used in the decomposition of rare earth concentrates in China is the rotary kiln invented by Academician Zhang Guocheng. High-temperature sulfuric acid roasting method, this method has made great contributions to the treatment of Baotou rare earth concentrates in my country. However, with the development of the times and technology, the industry generally believes that this method still has the following disadvantages: (1) The problem of sticking to the kiln during the mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/06C22B59/00
Inventor 周振喜
Owner 广西域潇西骏稀土功能材料有限公司
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