CN103215444B - Process for preventing rotary kiln from forming ring - Google Patents
Process for preventing rotary kiln from forming ring Download PDFInfo
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- CN103215444B CN103215444B CN201310153170.9A CN201310153170A CN103215444B CN 103215444 B CN103215444 B CN 103215444B CN 201310153170 A CN201310153170 A CN 201310153170A CN 103215444 B CN103215444 B CN 103215444B
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Abstract
The invention relates to a process for preventing a rotary kiln from forming ring, and belongs to the field of the hydro-metallurgy of rare earth. During a production process of high-temperature roasting of rare earth ore concentrate in concentrated sulfuric acid, the concentrated sulfuric acid and the rare earth ore concentrate are roasted in a rotary kiln; and simultaneously, a material feedback hole is formed on a low-temperature section position of the rotary kiln, a material return hole is formed on a high-temperature section of the rotary kiln, and the material feedback hole and the material return hole are connected through a feed delivery pipe outside the rotary kiln; when roasted ore in the rotary kiln moves to the material return hole on the high-temperature section, partial roasted ore enters into the material return hole, and enters into the rotary kiln to mix with an ore acid material after the roasted ore is delivered to the material feedback hole on low-temperature preheating section through the feed delivery pipe, and then is roasted once again. The process has the advantages of being relatively high in operation continuity and controllability, and easy to industrially produce.
Description
Technical field
The present invention relates to a kind of processing method of preveting kiln ringing, belong to rare-earth wet method field of metallurgy.
Technical background
At present domesticly utilize Baotou rare earth ore concentrate to carry out Rare Earth Concentrate Decomposition generally to adopt third generation sulfuric acid High-Temperature Strengthening sinter process, this art breading cost is low, rare earth rate of decomposition is high and technical maturity, but in vitriol oil high-temperature roasting rare earth ore concentrate process, because ore deposit acid ratio is lacked of proper care, kiln end temperature is crossed high reason and caused the inner ring formation phenomenon of rotary kiln to occur, affect the normal production of rare earth ore concentrate roasting.
In the prevention vitriol oil high-temperature roasting rare earth ore concentrate process of mentioning in rare-earth wet method smelting technology on-the-job and technical training teaching material, the measure of ring formation of rotary kiln has: check at any time sour ore deposit ratio, control kiln tail maturing temperature and can not cross high method, but these methods are difficult to realize in existing production technique.
Summary of the invention
The object of the present invention is to provide a kind of processing method of preveting kiln ringing.
For achieving the above object, the present invention by the following technical solutions:
In vitriol oil high-temperature roasting rare earth ore concentrate production process of the present invention, the vitriol oil and rare earth ore concentrate carry out roasting at rotary kiln, when roasting, be provided with back material hole in rotary kiln low-temperature zone position, rotary kiln high temperature section is provided with returning charge hole, back material hole is connected by the outside at least one carrier pipe of rotary kiln with returning charge hole, in the time that the roasted ore in rotary kiln moves to high temperature section returning charge hole, partial roasting ore deposit enters after returning charge hole is transported to low-temperature prewarming section back material hole by carrier pipe and enters in rotary kiln and mix and carry out roasting again with ore deposit acid material, reduce and directly contact with rotary kiln inwall because of ore deposit acid sizing, and the ring formation phenomenon causing.
Described returning charge hole is arranged at returning charge high temperature section, temperature: 300-1000 ℃.
Described back material hole is arranged at low-temperature prewarming section, temperature: 200-300 ℃.
The described roasted ore amount entering in carrier pipe accounts for the mass percent 5%-50% of ore deposit acid material.
Described carrier pipe adopts automatically, carries continuously.
This technological advantage is that continuity, the controllability of operation is higher, is easy to suitability for industrialized production.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
When roasting of the present invention, low-temperature zone position at rotary kiln 1 is provided with back material hole 2, the high temperature section of rotary kiln 1 is provided with returning charge hole 5, back material hole 2 is connected by two outside carrier pipes 3 of rotary kiln 1 with returning charge hole 5, in the time that the roasted ore in rotary kiln 1 moves to high temperature section returning charge hole 5, partial roasting ore deposit enters returning charge hole 5, by carrier pipe 3, material is transported to after the back material hole 2 of low-temperature prewarming section, enters in rotary kiln 1 and mixes and carry out roasting again with ore deposit acid material.
The returning charge hole 2 of rotary kiln 1 is arranged on 800 ℃ and locates, roasted ore for returning charge returns to low-temperature prewarming section back material hole 4 through carrier pipe 3 with 0.5Kg/min flow velocity, the vitriol oil mixing and rare earth ore concentrate enter the low-temperature prewarming section of rotary kiln 1 according to rotary kiln sense of rotation 6 with the flow velocity of 5Kg/min, from returning charge hole 5, material is returned out, returning charge amount is 10% of sour mineral aggregate amount, returning charge and sour mineral aggregate continue roasting in rotary kiln 1, and kiln residence time 2h, ring formation phenomenon does not occur.
Embodiment 2
When roasting of the present invention, low-temperature zone position at rotary kiln 1 is provided with back material hole 2, the high temperature section of rotary kiln 1 is provided with returning charge hole 5, back material hole 2 is connected by two outside carrier pipes 3 of rotary kiln 1 with returning charge hole 5, in the time that the roasted ore in rotary kiln 1 moves to high temperature section returning charge hole 5, partial roasting ore deposit enters returning charge hole 5, by carrier pipe 3, material is transported to after the back material hole 2 of low-temperature prewarming section, enters in rotary kiln 1 and mixes and carry out roasting again with ore deposit acid material.
The returning charge hole 2 of rotary kiln 1 is arranged on 800 ℃ and locates, roasted ore for returning charge returns to low-temperature prewarming section back material hole 4 through carrier pipe 3 with 1Kg/min flow velocity, the vitriol oil mixing and rare earth ore concentrate enter the low-temperature prewarming section of rotary kiln 1 according to rotary kiln sense of rotation 6 with the flow velocity of 5Kg/min, from returning charge hole 5, material is returned out, returning charge amount is 20% of sour mineral aggregate amount, returning charge and sour mineral aggregate continue roasting in rotary kiln 1, and kiln residence time 2h, ring formation phenomenon does not occur.
Embodiment 3
When roasting of the present invention, low-temperature zone position at rotary kiln 1 is provided with back material hole 2, the high temperature section of rotary kiln 1 is provided with returning charge hole 5, back material hole 2 is connected by two outside carrier pipes 3 of rotary kiln 1 with returning charge hole 5, in the time that the roasted ore in rotary kiln 1 moves to high temperature section returning charge hole 5, partial roasting ore deposit enters returning charge hole 5, by carrier pipe 3, material is transported to after the back material hole 2 of low-temperature prewarming section, enters in rotary kiln 1 and mixes and carry out roasting again with ore deposit acid material.
The returning charge hole 2 of rotary kiln 1 is arranged on 550 ℃ and locates, roasted ore for returning charge returns to low-temperature prewarming section back material hole 4 through carrier pipe 3 with 1Kg/min flow velocity, the vitriol oil mixing and rare earth ore concentrate enter the low-temperature prewarming section of rotary kiln 1 according to rotary kiln sense of rotation 6 with the flow velocity of 5Kg/min, from returning charge hole 5, material is returned out, returning charge amount is 20% of sour mineral aggregate amount, returning charge and sour mineral aggregate continue roasting in rotary kiln 1, and kiln residence time 2h, ring formation phenomenon does not occur.
Embodiment 4
When roasting of the present invention, low-temperature zone position at rotary kiln 1 is provided with back material hole 2, the high temperature section of rotary kiln 1 is provided with returning charge hole 5, back material hole 2 is connected by two outside carrier pipes 3 of rotary kiln 1 with returning charge hole 5, in the time that the roasted ore in rotary kiln 1 moves to high temperature section returning charge hole 5, partial roasting ore deposit enters returning charge hole 5, by carrier pipe 3, material is transported to after the back material hole 2 of low-temperature prewarming section, enters in rotary kiln 1 and mixes and carry out roasting again with ore deposit acid material.
The returning charge hole 2 of rotary kiln 1 is arranged on 550 ℃ and locates, roasted ore for returning charge returns to low-temperature prewarming section back material hole 4 through carrier pipe 3 with 1.5Kg/min flow velocity, the vitriol oil mixing and rare earth ore concentrate enter the low-temperature prewarming section of rotary kiln 1 according to rotary kiln sense of rotation 6 with the flow velocity of 5Kg/min, from returning charge hole 5, material is returned out, returning charge amount is 30% of sour mineral aggregate amount, returning charge and sour mineral aggregate continue roasting in rotary kiln 1, and kiln residence time 2h, ring formation phenomenon does not occur.
When roasting of the present invention, low-temperature zone position at rotary kiln 1 is provided with back material hole 2, the high temperature section of rotary kiln 1 is provided with returning charge hole 5, back material hole 2 is connected by two outside carrier pipes 3 of rotary kiln 1 with returning charge hole 5, in the time that the roasted ore in rotary kiln 1 moves to high temperature section returning charge hole 5, partial roasting ore deposit enters returning charge hole 5, by carrier pipe 3, material is transported to after the back material hole 2 of low-temperature prewarming section, enters in rotary kiln 1 and mixes and carry out roasting again with ore deposit acid material.
The returning charge hole 2 of rotary kiln 1 is arranged on 400 ℃ and locates, roasted ore for returning charge returns to low-temperature prewarming section back material hole 4 through carrier pipe 3 with 2 Kg/min flow velocitys, the vitriol oil mixing and rare earth ore concentrate enter the low-temperature prewarming section of rotary kiln 1 according to rotary kiln sense of rotation 6 with the flow velocity of 5Kg/min, from returning charge hole 5, material is returned out, returning charge amount is 40% of sour mineral aggregate amount, returning charge and sour mineral aggregate continue roasting in rotary kiln 1, and kiln residence time 2h, ring formation phenomenon does not occur.
Claims (2)
1. the processing method of a preveting kiln ringing, it is characterized in that: in vitriol oil high-temperature roasting rare earth ore concentrate production process, the vitriol oil and rare earth ore concentrate carry out roasting at rotary kiln, when roasting, be provided with back material hole in rotary kiln low-temperature zone position, back material hole is arranged at low-temperature prewarming section, temperature: 200-300 ℃, rotary kiln high temperature section is provided with returning charge hole, returning charge hole is arranged at returning charge high temperature section, temperature: 300-1000 ℃, back material hole is connected by least one carrier pipe of rotary kiln outside with returning charge hole, in the time that the roasted ore in rotary kiln moves to high temperature section returning charge hole, partial roasting ore deposit enters after returning charge hole is transported to low-temperature prewarming section back material hole by carrier pipe and enters in rotary kiln and mix and carry out roasting again with ore deposit acid material, the roasted ore amount entering in carrier pipe accounts for the mass percent 5%-50% that ore deposit acid is expected.
2. the processing method of a kind of preveting kiln ringing according to claim 1, is characterized in that: carrier pipe adopts automatically, carries continuously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310153170.9A CN103215444B (en) | 2013-04-27 | 2013-04-27 | Process for preventing rotary kiln from forming ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310153170.9A CN103215444B (en) | 2013-04-27 | 2013-04-27 | Process for preventing rotary kiln from forming ring |
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| Publication Number | Publication Date |
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| CN103215444A CN103215444A (en) | 2013-07-24 |
| CN103215444B true CN103215444B (en) | 2014-06-18 |
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| CN201310153170.9A Active CN103215444B (en) | 2013-04-27 | 2013-04-27 | Process for preventing rotary kiln from forming ring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106277855B (en) * | 2015-05-29 | 2018-12-04 | 宝山钢铁股份有限公司 | Formation rings in a kiln control method when KVS Active Lime Rotary Kiln coal powder injection |
| CN115477558A (en) * | 2022-09-13 | 2022-12-16 | 大连理工大学 | Rotary kiln internal circulation granular bed reactor and using method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201440032U (en) * | 2009-06-26 | 2010-04-21 | 中国恩菲工程技术有限公司 | Sintering apparatus |
| CN102146510A (en) * | 2011-03-07 | 2011-08-10 | 攀枝花钢城集团有限公司 | Roasting method for controlling ring formation of rotary kiln |
| CN102494535A (en) * | 2011-12-02 | 2012-06-13 | 中国科学院过程工程研究所 | Roasting rotary kiln capable of preventing rings from forming and roasting method |
| CN102706141A (en) * | 2012-06-13 | 2012-10-03 | 河北陶粒砂支撑剂有限公司 | Method for preventing formation of sintering ring of rotary kiln |
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2013
- 2013-04-27 CN CN201310153170.9A patent/CN103215444B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201440032U (en) * | 2009-06-26 | 2010-04-21 | 中国恩菲工程技术有限公司 | Sintering apparatus |
| CN102146510A (en) * | 2011-03-07 | 2011-08-10 | 攀枝花钢城集团有限公司 | Roasting method for controlling ring formation of rotary kiln |
| CN102494535A (en) * | 2011-12-02 | 2012-06-13 | 中国科学院过程工程研究所 | Roasting rotary kiln capable of preventing rings from forming and roasting method |
| CN102706141A (en) * | 2012-06-13 | 2012-10-03 | 河北陶粒砂支撑剂有限公司 | Method for preventing formation of sintering ring of rotary kiln |
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Address after: Queensland metal processing park of Baotou the Inner Mongolia Autonomous Region 014010 Patentee after: Baotou HUAMEI RE products Co., Ltd. Address before: 014010 the Inner Mongolia Autonomous Region Kundulun Baotou Steel Rare Earth Industrial Park Patentee before: Baotou HUAMEI RE products Co., Ltd. |