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Roasting system and roasting method for lithium-ore acidification by using externally-heated type rotary furnace

An external heating rotary furnace and acidification roasting technology, which is applied in lithium sulfate/sulfite, chemical industry, sustainable manufacturing/processing, etc., can solve the problems of difficult effective utilization, severe equipment corrosion, and large consumption of sulfuric acid, etc. problems, to achieve the effects of easy heat recovery, reduced emissions, and high heat exchange efficiency

Active Publication Date: 2013-01-16
西安三瑞超鼎新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Lithium salt manufacturers at home and abroad mostly use internal heating rotary acidification roasting furnaces (kilns) to realize this process, which has the disadvantages of large sulfuric acid consumption, large tail gas volume, serious pollution, and serious equipment corrosion. Exhaust gas is taken away, it is difficult to realize effective utilization, and the energy consumption is relatively large

Method used

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  • Roasting system and roasting method for lithium-ore acidification by using externally-heated type rotary furnace
  • Roasting system and roasting method for lithium-ore acidification by using externally-heated type rotary furnace
  • Roasting system and roasting method for lithium-ore acidification by using externally-heated type rotary furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1) After high temperature conversion roasting, cooling, and grinding to 200 mesh β spodumene is sent to the spodumene silo through a bucket elevator. The raw material composition is shown in the following table:

[0058] Component

Li 2 O

SiO 2

Al 2 O 3

P 2 O 5

K 2 O

Na 2 O

FeO

MgO

CaO

MnO

F

Burn

Content%

6.00

62.21

28.42

-

0.15

0.14

0.12

0.13

0.11

-

-

-

[0059] Note: "-" is an untested item, and its content is included in other impurities.

[0060] The discharge of the spodumene silo uses a pneumatic floating system and a silo wall vibration device. After the spodumene in the silo is weighed and measured by the screw feeder, it enters the coulter-type mixer;

[0061] 2) At the same time, the sulfuric acid used in acidification roasting is composed of 98.3% concentrated sulfuric acid and free SO 3 It is composed of 20% fuming sulfuric acid. The two acids are adjusted to 100% ± 2% in the acid mixing tank and then sent to the coulter m...

Embodiment 2

[0066] 1) The beta spodumene raw material from outside is sent to the spodumene silo. The raw material composition is shown in the following table:

[0067] Component

Li 2 O

SiO 2

Al 2 O 3

P 2 O 5

K 2 O

Na 2 O

FeO

MgO

CaO

MnO

F

Burn

[0068] Content%

6.00

62.21

28.42

-

0.15

0.14

0.12

0.13

0.11

-

-

-

[0069] Note: "-" is an untested item, and its content is included in other impurities.

[0070] An arch-breaking screw is set in the silo, and the spodumene in the silo is weighed and measured by a belt scale, then enters the non-gravity mixer and mixed with sulfuric acid and then sent to the rotary acidification furnace. The top of the silo is equipped with a stand-alone dust collector to remove the dust generated when the spodumene falls into the silo.

[0071] 2) At the same time, the sulfuric acid used in acidification roasting is sent to the sulfuric acid absorption tower from the concentrated sulfuric acid with a concentration of 93%, and fre...

Embodiment 3

[0076] 1) The beta spodumene raw material from outside is sent to the spodumene silo. The raw material composition is shown in the following table:

[0077] Component

Li 2 O

SiO 2

Al 2 O 3

P 2 O 5

K 2 O

Na 2 O

FeO

MgO

CaO

MnO

F

Burn

Content%

6.00

64.76

27.72

-

-

0.22

0.32

0.16

-

-

-

-

[0078] Note: "-" is an untested item, and its content is included in other impurities.

[0079] An arch-breaking screw is set in the silo, and the spodumene in the silo is weighed and measured by a belt scale, then enters the non-gravity mixer and mixed with sulfuric acid and then sent to the rotary acidification furnace.

[0080] 2) At the same time, sulfuric acid with a concentration of 98% is sent to the sulfuric acid absorption tower, and the fuming sulfuric acid with a concentration of 20% is sent to the acid mixing tank and mixed with the sulfuric acid from the sulfuric acid washing tower as the feed acid of the mixer. Adjust the concentration in the t...

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Abstract

The invention discloses a roasting system and a roasting method for lithium-ore acidification by using an externally-heated type rotary furnace, which comprises the following steps of: generating acidifying grog through acidifying roasting after mixing beta lithium ores and sulfuric acid by using the externally-heated type rotary furnace as the core equipment of acidifying roasting reaction, and sending the acidifying grog which is generated after acidifying roasting into a subsequent working procedure after cooling the acidifying grog, wherein the sulfuric acid for acidifying roasting is used after the concentration of an acid liquor after tail gas is washed is adjusted through fuming sulfuric acid and can also be directly prepared from concentrated sulfuric acid or fuming acid or by mixing the two acids; the tail gas which is generated in the process of acidifying roasting is discharged with reaching standards after acid washing and alkali washing, and most of the acidic gas in the tail gas returns to the roasting system along with the washing acid to be reutilized during acid washing. The invention overcomes the defects of large tail-gas quantity, serious pollution and the like of a traditional internally-heated type acidifying-roasting process and provides a good method for the extraction of metallic lithium in the lithium ores, the self-heating of the reaction is fully utilized, energy does not need to be additionally consumed after the self reaction temperature is reached, and the energy-saving effect is remarkable.

Description

Technical field [0001] The invention belongs to the technical field of lithium salt production, and relates to a system and method for acidifying and roasting lithium ore with an externally heated rotary kiln, specifically, a system and method for sulfating and roasting lithium ore with an externally heated rotary kiln as the core equipment . Background technique [0002] There are many methods for extracting lithium from lithium ore, but the sulfuric acid method is still the most extensive method for extracting lithium in the world. Most lithium salt manufacturers at home and abroad currently use this process widely. The sulfuric acid method has a small material circulation and high production efficiency. , Low energy consumption, high metal recovery rate and other outstanding advantages, so the lithium salt produced by this method accounts for a very high proportion of the world's total lithium salt output. [0003] Taking spodumene as an example, the principle of acidification ...

Claims

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Application Information

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IPC IPC(8): C01D15/06
CPCY02P20/10
Inventor 何建祥魏超杨扬刘明会
Owner 西安三瑞超鼎新能源科技有限公司
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