CN-116723895-B - Method for enriching lithium from low-grade lithium clay ore

CN116723895BCN 116723895 BCN116723895 BCN 116723895BCN-116723895-B

Abstract

The application provides a method for enriching lithium from low-grade lithium clay ores. The method for enriching lithium from the low-grade lithium clay ore comprises the steps of obtaining the low-grade lithium clay ore, crushing and roasting the low-grade lithium clay ore to obtain a sinter, scrubbing the sinter to enable the sinter to be mutually rubbed, carrying out secondary screening treatment on the sinter after scrubbing to sequentially obtain a primary screened material with the particle size of less than or equal to 0.83mm and a secondary screened material with the particle size of less than or equal to 0.015mm, and carrying out floatation operation on the primary screened material to obtain a floatation material, wherein the floatation material is combined with the secondary screened material to serve as lithium concentrate. The method for enriching lithium from the low-grade lithium clay ore can efficiently develop and utilize lithium resources in the low-grade lithium clay ore.

Inventors

LI HAISEN
RAO JINSHAN
ZHANG PENG
TANG SHIJIAN
RUAN DINGSHAN
LI CHANGDONG

Assignees

广东邦普循环科技有限公司
湖南邦普循环科技有限公司

Dates

Publication Date: 20260505
Application Date: 20230323

Claims (20)

1. A method for enriching lithium from low-grade lithium clay ore, comprising the steps of: Obtaining low-grade lithium clay ore; Crushing and roasting the low-grade lithium clay ore to obtain a sinter; Scrubbing the sinter to enable the sinter to be mutually rubbed; Performing secondary screening treatment on the sinter after scrubbing treatment to sequentially obtain primary screened matters with the particle size smaller than or equal to 0.83mm and secondary screened matters with the particle size smaller than or equal to 0.015 mm; Carrying out flotation operation on the first-stage screened material to obtain a flotation material, wherein the flotation material combines the second-stage screened material to serve as lithium concentrate; wherein, the crushing roasting treatment of the low-grade lithium clay ore comprises the following steps: Crushing the low-grade lithium clay ore to crush the low-grade lithium clay ore until the granularity is less than or equal to 20mm; roasting the crushed low-grade lithium clay ore; roasting the crushed low-grade lithium clay ore at a roasting temperature of 100-200 ℃; and carrying out flotation operation on the first-stage screened material, wherein the flotation operation comprises the following steps of: decalcification treatment is carried out on the first-stage screening material; desulfurizing the first-stage screened material after decalcification treatment; Carrying out decalcification treatment on the first-stage screening material, namely sequentially carrying out decalcification roughing, decalcification selection and twice decalcification scavenging on the first-stage screening material, wherein Na 2 CO 3 and NaOH are selected as regulators in the decalcification roughing, sodium polystyrene sulfonate is selected as an inhibitor in the decalcification roughing and the decalcification scavenging, and a fatty acid collector is selected as a collector in the decalcification roughing, the decalcification selection and the decalcification scavenging; And carrying out desulfurization treatment on the first-stage screened material after desulfurization treatment, namely sequentially carrying out desulfurization roughing and desulfurization scavenging on the first-stage screened material after twice decalcification scavenging, wherein CaO is selected as an adjusting agent in the desulfurization roughing, sodium polystyrene sulfonate is selected as an inhibitor in the desulfurization roughing and the desulfurization scavenging, and a mixture of dodecylamine and butyl xanthate is selected as a collecting agent in the desulfurization roughing and the desulfurization scavenging.
2. The method for enriching lithium from low-grade lithium clay ore according to claim 1, wherein a roasting time for roasting the crushed low-grade lithium clay ore is 30min to 60min.
3. The method for enriching lithium from low-grade lithium clay ore according to claim 1, wherein the sinter is subjected to a scrubbing treatment, in particular by placing the sinter in a dispersion medium followed by stirring scrubbing.
4. The method for enriching lithium from low-grade lithium clay ore according to claim 3 wherein the sinter has a solids content of 50% to 80% when placed in the dispersion medium.
5. The method for enriching lithium from low-grade lithium clay ore according to claim 3, wherein the scrubbing strength of the stirring scrubbing is 800r/min to 1200 r/min.
6. The method for enriching lithium from low-grade lithium clay ore according to claim 3, wherein the scrubbing time of stirring scrubbing is 7 min to 15 minutes.
7. The method for concentrating lithium from low-grade lithium clay mineral according to claim 1 wherein prior to the step of performing a flotation operation on the primary screen and subsequent to the step of performing a secondary screening treatment on the sinter after the scrubbing treatment, the method for concentrating lithium from low-grade lithium clay mineral further comprises the step of grinding the primary screen.
8. The method for enriching lithium from low-grade lithium clay ore according to claim 7 wherein the D85 of the primary screen material after the grinding treatment is less than or equal to 0.074mm.
9. The method of claim 1, wherein the step of desulfurizing the first-stage screen after decalcification treatment and the step of decalcification treatment are followed by the step of enriching lithium from the low-grade lithium clay ore, further comprising the steps of: And scattering the primary screening material after decalcification treatment.
10. The method of enriching lithium from low-grade lithium clay ore according to claim 1, wherein the Na 2 CO 3 is configured as a 5% strength solution for decalcification roughing.
11. The method for enriching lithium from low-grade lithium clay ore according to claim 1, wherein 1000 g-4000 g of Na 2 CO 3 is used as a regulator in each ton of the primary screen material in decalcification coarse separation.
12. The method of enriching lithium from low-grade lithium clay ore according to claim 1 wherein NaOH is configured as a 5% strength solution for decalcification roughing.
13. The method for enriching lithium from low-grade lithium clay ore according to claim 1, wherein 500 g-2000 g NaOH is used as a modifier per ton of the primary screen material.
14. The method for enriching lithium from low-grade lithium clay ore according to claim 1, wherein the molecular weight of the sodium polystyrene sulfonate is 50000-1000000.
15. The method of enriching lithium from low-grade lithium clay ore according to claim 1 wherein the sodium polystyrene sulfonate is configured as a 5% strength solution for decalcification roughing and decalcification scavenger.
16. The method for enriching lithium from low-grade lithium clay ore according to claim 1, wherein 200 g-2000 g of the sodium polystyrene sulfonate is used as an inhibitor in each ton of the primary screen material.
17. The method of enriching lithium from low-grade lithium clay ore according to claim 1 wherein the fatty acid collector is sodium fatty acid.
18. The method of enriching lithium from low-grade lithium clay ore according to claim 1 wherein the fatty acid collector is at least one of sodium oleate, oxidized paraffin soap, and oleic acid.
19. The method of enriching lithium from low-grade lithium clay ore according to claim 1 wherein the fatty acid collector is configured as a 6% strength solution for decalcification roughing, decalcification beneficiation, and decalcification scavenger.
20. The method for enriching lithium from low-grade lithium clay ore according to claim 1, wherein 200 g-2000 g of the fatty acid collector is used as a collector in each ton of the primary screen material in decalcification coarse separation.

Description

Method for enriching lithium from low-grade lithium clay ore Technical Field The invention relates to the technical field of mineral processing, in particular to a method for enriching lithium from low-grade lithium clay ores. Background Lithium is widely and actively used in the high and new technology industry due to its excellent physicochemical properties, especially in the fields of batteries, new energy automobiles, medicines, aerospace and the like, has extremely high strategic value, is called 21 st century new energy metal by the world, and is a metal capable of promoting world progress. The lithium resources in China are rich, the lithium reserves occupy the fifth place of the ranking world, most of the lithium resources are located in Qinghai-Tibet plateau, the development conditions are hard, 70% of the development conditions are brine type lithium resource mineral deposits, the development and utilization technology of the brine type lithium resources is not mature, the magnesium lithium content in the obtained concentrate is relatively high, the rest 30% is pegmatite type mineral deposits, but as the high-grade pegmatite spodumene and lepidolite are continuously developed and utilized, the comprehensive grade of the lithium ores is continuously reduced, and the above reasons are combined, so that the lithium resources used in China are required to be imported from abroad in a large amount, and the technology for exploring and developing novel lithium ore resources to obtain lithium is particularly important for solving the problem. The clay type lithium ore has relatively low lithium content due to the self-mineralization property, and the lithium-containing mineral has relatively fine embedding granularity, so that development and utilization are difficult, few reports are reported on development and utilization examples of the ore deposit, and the clay type lithium ore has important significance for exploring and developing novel lithium ore resources, such as low-grade lithium clay ore, developing novel medicaments and novel processes in lithium ore aspect for realizing high-efficiency utilization of lithium resources and solving self-supporting problem of lithium in China. Disclosure of Invention The invention aims to overcome the defects in the prior art and provides a method for enriching lithium from low-grade lithium clay ores, which can efficiently develop and utilize lithium resources in the low-grade lithium clay ores. The aim of the invention is realized by the following technical scheme: a method for enriching lithium from low-grade lithium clay ore, comprising the steps of: Obtaining low-grade lithium clay ore; Crushing and roasting the low-grade lithium clay ore to obtain a sinter; Scrubbing the sinter to scrub and separate clay ore with smaller hardness and granularity from gangue ore with larger hardness in the sintered ore component; Performing secondary screening treatment on the sinter after scrubbing treatment to sequentially obtain primary screened matters with the particle size smaller than or equal to 0.83mm and secondary screened matters with the particle size smaller than or equal to 0.015 mm; And carrying out floatation operation on the first-stage screened material to obtain a floatation material, wherein the floatation material is combined with the second-stage screened material to serve as lithium concentrate. In one embodiment, the crushing and roasting treatment of the low-grade lithium clay ore comprises the following steps: Crushing the low-grade lithium clay ore to crush the low-grade lithium clay ore until the granularity is less than or equal to 20mm; Roasting the crushed low-grade lithium clay ore. In one embodiment, the roasting temperature of roasting the crushed low-grade lithium clay ore is 100-400 ℃. In one embodiment, the roasting time of roasting the crushed low-grade lithium clay ore is 30-60 min. In one embodiment, the sinter is subjected to a scrubbing treatment, specifically by placing the sinter in a dispersion medium followed by stirring scrubbing. In one embodiment, the solid content of the sinter is 50% -80% when the sinter is placed in the dispersion medium. In one embodiment, the stirring scrubbing has a scrubbing strength of 800-1200 r/min. In one embodiment, the scrubbing time of the stirring scrubbing is 7-15 min. In one embodiment, the method of enriching lithium from low grade lithium clay ore further comprises the step of grinding the primary screen before the step of flotation of the primary screen and after the step of secondary screening of the sinter after the scrubbing treatment. In one embodiment, the D85 of the primary screen material after the grinding treatment is less than or equal to 0.074mm. In one embodiment, the flotation operation on the primary screen includes the steps of: decalcification treatment is carried out on the first-stage screening material; And carrying out desulfurization treatment on the first-stage scre