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Treatment method of lithium-containing wastewater

A treatment method and technology for wastewater, applied in the fields of energy wastewater treatment, multi-stage water treatment, water/sewage treatment, etc.

Active Publication Date: 2021-06-08
SDIC XINJIANG LUOBUPO POTASH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a treatment method for lithium-containing wastewater for the problem of how to deal with the lithium-containing high-salinity wastewater

Method used

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  • Treatment method of lithium-containing wastewater
  • Treatment method of lithium-containing wastewater
  • Treatment method of lithium-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The treatment object of embodiment 1 is lithium-containing wastewater as shown in table 2.

[0041] The composition table of the lithium-containing waste water of table 2 embodiment 1

[0042] Element Li Na K B Cl Content (g / L) 2.3 60.0 22.0 0.9 98.6 Element SO 4 2- (g / L)

CO 3 2- (g / L)

HCO 3 2- (g / L)

As (mg / L) pH content 13.1 9.8 1.4 98 10

[0043] Step 1. Add hydrochloric acid to the lithium-containing wastewater in Example 1, adjust the pH of the lithium-containing wastewater to 2, and obtain the acidified lithium-containing wastewater.

[0044] Step 2. Pass hydrogen sulfide gas into the acidified lithium-containing wastewater obtained in step 1 to remove heavy metal ions in the acidified lithium-containing wastewater; then perform solid-liquid separation for the first time and retain the first filtrate to obtain the removed Lithium-containing wastewater after heavy metal ions. In the lithium-...

Embodiment 2

[0048] The treatment object of embodiment 2 is lithium-containing wastewater as shown in table 3.

[0049] The composition table of the lithium-containing waste water of table 3 embodiment 2

[0050] Element Li Na K B Cl Content (g / L) 3.0 30.1 8.1 0.4 40.1 Element SO 4 2- (g / L)

CO 3 2- (g / L)

HCO 3 2- (g / L)

As (mg / L) pH content 9.2 12.8 2.0 98 12

[0051] Step 1. Add hydrochloric acid to the lithium-containing wastewater in Example 2, adjust the pH of the lithium-containing wastewater to 4.5, and obtain the acidified lithium-containing wastewater.

[0052] Step 2, adding sodium sulfide to the acidified lithium-containing wastewater obtained in step 1 to remove heavy metal ions in the acidified lithium-containing wastewater; then carry out the first solid-liquid separation and retain the first filtrate to obtain the removal of heavy metal ions Lithium-containing wastewater. In the lithium-containing wast...

Embodiment 3

[0056] The treatment object of embodiment 3 is lithium-containing waste water as shown in table 4.

[0057] The composition table of the lithium-containing waste water of table 4 embodiment 3

[0058]

[0059]

[0060] Step 1. Add hydrochloric acid to the lithium-containing wastewater in Example 3, adjust the pH of the lithium-containing wastewater in Example 1 to 4.0, and obtain the acidified lithium-containing wastewater.

[0061] Step 2, adding sodium sulfide to the acidified lithium-containing wastewater obtained in step 1 to remove heavy metal ions in the acidified lithium-containing wastewater; then carry out the first solid-liquid separation and retain the first filtrate to obtain the removal of heavy metal ions Lithium-containing wastewater. In the lithium-containing wastewater after removal of heavy metal ions, the content of As was 0.2 mg / L.

[0062] Step 3, pump the lithium-containing waste water obtained in step 2 into the evaporator after removing heavy me...

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Abstract

The invention relates to a treatment method for lithium-containing wastewater. The method comprises the following steps: step 1, adjusting the pH of the lithium-containing wastewater to 2-4.5 to obtain the acidified lithium-containing wastewater; step 2, adding a precipitant to the acidified lithium-containing wastewater and reacting to remove the acidified lithium-containing wastewater Heavy metal ions in wastewater; then carry out solid-liquid separation for the first time and retain the first filtrate to obtain lithium-containing wastewater after removing heavy metal ions; step 3, carry out evaporation and crystallization sequentially on lithium-containing wastewater after removing heavy metal ions, and second After the solid-liquid separation, the second filtrate is retained, the second filtrate is subjected to cold crystallization in turn, and the third filtrate is retained after the third solid-liquid separation, and the third filtrate is evaporated and concentrated to obtain a lithium-enriched liquid; step 4, to lithium-enriched Sodium carbonate is added to the collected liquid, and the reaction is carried out at 90°C to 100°C. After sufficient reaction, the fourth solid-liquid separation is carried out and the filter residue is retained. The filter residue is lithium carbonate. The invention realizes the harmlessness, reduction and resource utilization of waste water.

Description

technical field [0001] The invention relates to the fields of waste water treatment and resource recovery, in particular to a treatment method for lithium-containing waste water. Background technique [0002] As a strategic emerging industrial mineral, lithium is included in the strategic mineral catalog of the National Mineral Resources Plan (2016-2020), and is called "the energy metal of the 21st century". With the rapid development of the lithium battery new energy industry, the demand for lithium salt products such as lithium carbonate and lithium hydroxide has become increasingly strong. At present, more than 70% of lithium salt products are extracted from salt lake brine, and the rest are extracted from ores (spodumene, lepidolite). my country is rich in lithium resources, and its reserves rank among the top in the world, about 80% of which are salt lake brine lithium mines distributed in Qinghai and Tibet. Salt lake brine generally has the problem of high magnesium-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D15/08
CPCC01D15/08C02F1/001C02F1/04C02F1/5236C02F1/66C02F9/00C02F2301/08Y02W10/37
Inventor 张秀峰谭秀民杨卉芃伊跃军张利珍马亚梦张永兴
Owner SDIC XINJIANG LUOBUPO POTASH CO LTD