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Method for producing granulated sorbents and installation for carrying out the method

A technology for manufacturing particles and sorbents, which is applied to the equipment for implementing the method, manufacturing particle sorbents, and the field of sorbents for obtaining lithium in salt liquids including natural salt liquids, which can solve the problems of burning hazards and low recovery rates of methyl chloride

Inactive Publication Date: 2004-12-29
青海盐湖蓝科锂业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this equipment are: the recovery rate of methyl chloride is low, because it is polluted by the hydrolyzate in the evaporation desorption process, the liquid methyl chloride obtained needs to be purified, and there is a high degree of pollution due to the use of a large amount of activated carbon to absorb methyl chloride vapor burn hazard

Method used

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  • Method for producing granulated sorbents and installation for carrying out the method
  • Method for producing granulated sorbents and installation for carrying out the method
  • Method for producing granulated sorbents and installation for carrying out the method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0089] in such as figure 1 2.5 kg of finely divided gibbsite Al(OH) is fed into the mixer with a capacity of 10 liters as shown 3 (aluminum hydroxide) and 0.98kg lithium chloride monohydrate LiCl·H 2 O. The mixer container 4 is then raised as far as the stop, where the mixer slowly enters the charge. When the container reaches the top level, switch the mixer to full speed (about 450 rpm). After 15 minutes the mixer was turned off and the LiCl incorporation was 85%. The charge is filled in the container of the centrifugal grinding-activator ZMA-06; when running through the centrifugal grinding-activating machine, the degree of component combination reaches 92%, and the molar ratio LiCl in the produced DHAL-Cl: Al(OH ) 3 is 0.46. When the material is treated with water, the molar ratio LiCl:Al(OH) in the product 3 It is equal to 0.33, which means that 28% of LiCl is taken out, and the amount of lithium (mg) relative to the mass (g) of the sorbent corresponds to a sorption...

example 2

[0094] Manufacture DHAL-Cl according to the method described in example 1, and molar ratio LiCl: Al (OH) 3 Equal to 0.46. The products are made into granules with different compositions by means of chlorinated polyvinyl chloride (PVC) as binder and methyl chloride (MCI) as solvent. The results are shown in Table 2:

[0095]

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example

Mixed ingredients for granulation, % max

Composition of dry granules, % max

exchange capacity

mg / g

Mechanical strength,%

DHAL-Cl

pvc

MCI

loading

h 2 O: LiCl

product

LiCl:AL(OH) 3

2-1

45.7

3.8

50.5

92.3

7.7

7.2

99.3

2-2

44.2

3.7

51.9

91.9

8.1

7.0

99.4

2-3

42.8

4.0

53.2

91.5

8.5

7.0

99.5

2-4

40.1

4.2

55.7

9...

example 3

[0103] With the help of a special laboratory apparatus, a drying chamber with inlet and outlet fittings, the process of separating methyl chloride from a paste obtained by dissolving PVC and DHAL-Cl sorbent in methyl chloride under stirring was studied . A possible method for separating methyl chloride is paste drying under air flow (draft gas) and low pressure. The low pressure in the drying chamber and the supply of air thereto are ensured by means of a gas blower and shut-off control solenoid valves arranged on the inlet and outlet of the drying chamber. Air consumption is measured with a rotameter, while low pressure is measured with a U-shaped manometer. Sampling of the gaseous phase exiting the drying chamber was performed with a 100 ml gas syringe at the outlet of the drying chamber. The control for the separation of methyl chloride was carried out according to the gas chromatography method with respect to the methyl chloride during the sampling of the gas phase at th...

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Abstract

The invention relates to a method for producing granulated sorbents, and to an installation for carrying out the method. The aim of the invention is to obtain the chloride form of the double hydroxide of aluminium and lithium as LiCL2AI / OH)3 nH2O (DHAL-CL) in a waste-free solid phase of aluminium hydroxide and lithium salts in a mixer, with subsequent continuous activation of crystalline DHAL-CI in a centrifugal mill activator in order to obtain a defectuous material structure. The product obtained is mixed with chlorinated polyvinyl chloride as a binding agent and with liquid methylene chloride. The granulation is carried out by extruding the paste produced and refining the same in the granulator. The methylene chloride produced is collected by an organic liquid absorbent having a high boiling point. The methylene chloride steam is guided out of the material flow in the carrier gas flow in the manner of an ideal displacement in the counter-current of the contact phases. The methylene chloride recuperation is carried out in two steps according to the thermal method, during the heating of the absorbent used. The inventive method is characterised by essentially reduced environmental impact in relation to prior art, due to the closed material circuits used. The granulated sorbent is especially suitable for the selective extraction of lithium from chloride salt lye of any mineralization, with an extraction degree of 95 %.

Description

technical field [0001] The present invention relates to the field of inorganic sorbents and to methods for the manufacture of particulate sorbents, in particular sorbents for obtaining lithium from lithium-containing brines, including natural brines. The invention also relates to a device for carrying out the method. Background technique [0002] Lithium and its compounds are used in various industries such as aluminum, glass and chemical production. [0003] The sources of solid raw materials for obtaining lithium have been largely depleted today. However, the lithium shortage problem can be solved by utilizing alternative sources of lithium raw materials. Belonging to such sources are: various salt liquids, natural salt pond sols, sea water salt liquids, petroleum, diamond, and other associated salt liquids of ore deposits, process solutions, and wastewater from some chemical and biochemical enterprises. Lithium can be obtained from these solutions (salt solutions) by m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04B01J20/08B01J20/30B01J47/00B01J47/018
CPCB01D2253/104B01J47/007B01D53/02B01J20/3042B01D2253/10B01J20/30B01J20/08B01J20/2803B01J47/018
Inventor 亚历山大·雷布瑟夫纳塔利娅·科楚帕罗拉里莎·缅热尔斯卢德米拉·谢里科娃叶连娜·马梅洛娃瓦列里·季塔连科阿尔卡季·坚
Owner 青海盐湖蓝科锂业股份有限公司
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