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A treatment method for lithium slag by-product of lithium extraction in salt lake, concrete alkali aggregate reaction inhibitor and application thereof

A treatment method and by-product technology, applied in the treatment of lithium slag by-product of lithium extraction from salt lakes, concrete alkali-aggregate reaction inhibitor field, can solve problems such as difficult to fully utilize, high cost of alkali metal lithium salts, waste of resources, etc. Achieve the effect of solving the waste of lithium resources, good suppression effect and good performance

Active Publication Date: 2016-01-06
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of salts of alkali metal lithium is very high, mainly in theory, and there are few practical applications
Correspondingly, a large amount of lithium slag produced in the domestic salt lake development process cannot be fully utilized
Since the industrialization of large-scale production of lithium extraction from salt lakes in China, the by-product lithium slag has not found a new way of utilization due to the high content of impurities and the difficulty of separating impurities. It is difficult to make full use of it, causing resource waste in the salt lake area and affecting Normal production of lithium extraction industry in salt lake brine

Method used

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  • A treatment method for lithium slag by-product of lithium extraction in salt lake, concrete alkali aggregate reaction inhibitor and application thereof
  • A treatment method for lithium slag by-product of lithium extraction in salt lake, concrete alkali aggregate reaction inhibitor and application thereof
  • A treatment method for lithium slag by-product of lithium extraction in salt lake, concrete alkali aggregate reaction inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Lithium slag, a by-product of raw material salt lake lithium extraction, comes from Qinghai Lithium Industry Co., Ltd., and its chemical composition is: Mg 2+ Contains 33.82%, Li + Contains 2.70%, Ca 2+ Contains 1.54%, Na + Contains 0.52%, Cl - Contains 1.85%, SO 4 2- Contains 0.002%, K + Inclusive of 0.14.

[0025] Ball mill lithium slag, a by-product of raw material salt lake lithium extraction, to 100 mesh, wash with water at 100°C, precipitate for 1.5 hours, and then calcinate at 80°C for 24 hours to obtain an inhibitor of concrete alkali-aggregate reaction.

[0026] Ordinary Portland cement C42.5 adopts the rapid mortar rod method, and uses 30% lithium slag, a by-product of salt lake lithium carbonate, to replace part of the cement. The mass ratio of cement and sand is 1:2.25, and the water-cement ratio is 0.47. The expansion rate was tested under the conditions of temperature (40±2)°C and relative humidity of 95%. From Table 1 and figure 2 It c...

Embodiment 2

[0029] Example 2 Lithium slag, a by-product of raw material salt lake lithium extraction, comes from Qinghai Lithium Industry Co., Ltd., and its chemical composition is: Mg 2+ Contains 33.82%, Li + Contains 2.70%, Ca 2+ Contains 1.54%, Na + Contains 0.52%, Cl - Contains 1.85%, SO 4 2- Contains 0.002%, K + Inclusive of 0.14.

[0030] Ball mill lithium slag, a by-product of raw material salt lake lithium extraction, to 180 mesh, wash with water at 100°C, precipitate for 1.5 hours, and then calcinate at 80°C for 18 hours to obtain an inhibitor of concrete alkali-aggregate reaction.

[0031] Ordinary Portland cement C42.5 adopts the rapid mortar rod method, and uses 5% lithium slag, a by-product of salt lake lithium carbonate, to replace part of the cement. The mass ratio of cement and sand is 1:2.25, and the water-cement ratio is 0.47. The expansion rate was tested under the conditions of temperature (40±2)°C and relative humidity of 95%.

Embodiment 3

[0032] Example 3 Lithium slag, a by-product of lithium extraction from raw material salt lake, comes from Qinghai Lithium Industry Co., Ltd., and its chemical composition is: Mg 2+ Contains 33.82%, Li + Contains 2.70%, Ca 2+ Contains 1.54%, Na + Contains 0.52%, Cl - Contains 1.85%, SO 4 2- Contains 0.002%, K + Inclusive of 0.14.

[0033]Ball mill lithium slag, a by-product of raw material salt lake lithium extraction, to 120 mesh, wash with water at 120°C, precipitate for 1 hour, and then calcinate at 80°C for 10 hours to obtain an inhibitor of concrete alkali-aggregate reaction.

[0034] Ordinary Portland cement C42.5 adopts the rapid mortar rod method, and uses 10% lithium slag, a by-product of salt lake lithium carbonate, to replace part of the cement. The mass ratio of cement and sand is 1:2.25, and the water-cement ratio is 0.47. The expansion rate was tested under the conditions of temperature (40±2)°C and relative humidity of 95%.

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Abstract

The invention discloses a treating method for byproduct lithium residue of salt lake lithium extraction. The method comprises the following steps: 1) grinding the byproduct lithium residue of salt lake lithium extraction and then sieving; 2) washing products after sieving, depositing, filtering, collecting solid bodies and drying. The invention also discloses an inhibitor prepared by using the method. According to the invention, by the proper processes of grinding, washing, depositing, filtering, drying and the like, the ratio of harmful ingredient sodium chloride in the lithium residue can be reduced, so that the concrete alkali-aggregate reaction inhibitor which is excellent in performance and low in price can be prepared. The inhibitor can be used for preventing the sodium chloride from intensifying the corrosion of concrete reinforcement and a concrete alkali-aggregate reaction, and has the characteristics of less doping amount and good inhibition effect.

Description

technical field [0001] The invention belongs to the field of salt lake chemistry, and in particular relates to a treatment method for lithium slag, a by-product of lithium extraction from salt lakes, a concrete alkali-aggregate reaction inhibitor and applications thereof. Background technique [0002] The alkali-aggregate reaction of concrete (Alkali-AggregateReaction, referred to as AAR) is the free alkali metal ion (Na + 、K + etc.) and active aggregate, which is the main reason for the decline in the durability of concrete. Once it occurs, it is difficult to stop and even less easy to treat. It is called the "cancer" of concrete. AAR reaction has become a concrete It is the second largest disease in the structure after the corrosion of steel bars. [0003] At present, the main measures to prevent the alkali-aggregate reaction (AAR) of concrete are as follows: [0004] (1) Use non-reactive aggregates. The use of inactive aggregates is the safest and most reliable measur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/10
Inventor 文静肖学英董金美李颖张全有郑卫新常成功
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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