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Heavy metal recovery method and sulfide precipitation method for magnesium-containing wastewater

A recycling method and sulfide precipitation technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water pollutants, etc., can solve problems such as only stacking treatment, high magnesium-containing impurities, and no resource value. Achieve the effect of increasing resource recycling rate, reducing magnesium-containing impurities and avoiding overreaction

Pending Publication Date: 2021-06-25
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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  • Description
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Problems solved by technology

However, for high-magnesium wastewater, the existing sulfidation precipitation method can easily bring magnesium into the sedimentation slag during the precipitation process of nickel sulfide and cobalt sulfide. Therefore, the obtained nickel sulfide and cobalt precipitates contain too much magnesium impurities and have no resource value. ; The heavy metal chelating agent method will introduce some organic matter into the sulfide precipitation, which will also affect the resource utilization of nickel sulfide and cobalt materials
The pretreatment + sulfidation precipitation process used in the existing actual production line to treat high-magnesium wastewater, through the addition of sodium sulfide to control the pH of the end point of sulfide precipitation, to realize the sulfide precipitation of nickel and cobalt elements, and the magnesium impurities in the obtained solid precipitation slag reach 10-15% , it is difficult to put it back into the production system or sell it outside, and it can only be stacked
Whether it is from the perspective of environmental protection or resource recycling, this process has great problems

Method used

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  • Heavy metal recovery method and sulfide precipitation method for magnesium-containing wastewater
  • Heavy metal recovery method and sulfide precipitation method for magnesium-containing wastewater
  • Heavy metal recovery method and sulfide precipitation method for magnesium-containing wastewater

Examples

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Effect test

Embodiment 1

[0050] The magnesium-containing wastewater used in this embodiment is cobalt smelting high-magnesium wastewater, wherein the main components are: Co 2+ : 2.3g / L, Ni 2+ : 0.67g / L, Mg 2+ : 45.7g / L, Cu 2+ : 0.0002g / L. Take 5L of raw high-magnesium wastewater, place it in an experimental container, heat it to 50°C, and adjust the pH to 3.6 with 32% liquid caustic soda; add sodium sulfide and sulfur that can provide sulfide ions that are 1.2 times the total molar amount of cobalt-nickel metal in the wastewater Sodium sulfide, the molar ratio of sodium sulfide and sodium thiosulfate is 10:1, the terminal potential is controlled at -63mV, and the reaction time is 1h; after the sulfide precipitation is completed, add 20% dilute sulfuric acid to adjust the pH to 7.6; then filter Separate, and add pure water to the filter residue with a liquid-solid ratio of 4:1 to rinse until the concentration of magnesium ions in circulating water that is 4 times the mass of the precipitate is not ...

Embodiment 2

[0052] The magnesium-containing wastewater used in this embodiment is cobalt smelting high-magnesium wastewater, wherein the main components are: Co 2+ : 2.8g / L, Ni 2+ : 1.5g / L, Mg 2+ : 47.3g / L, Cu 2+ : 0.00023g / L. Take 5L of raw high-magnesium wastewater, place it in an experimental container, heat it to 50°C, and adjust the pH to 3.6 with 32% liquid caustic soda; add sodium sulfide and sulfur that can provide sulfide ions that are 1.4 times the total molar amount of cobalt-nickel metal in the wastewater Sodium sulfide, the molar ratio of sodium sulfide and sodium thiosulfate is 12:1, the terminal potential is controlled at -78mV, and the reaction time is 1h; after the sulfide precipitation is completed, add 20% dilute sulfuric acid to adjust the pH to 7.8; then filter Separate, and add pure water to the filter residue with a liquid-solid ratio of 4:1 to rinse until the concentration of magnesium ions in circulating water that is 4 times the mass of the precipitate is not ...

Embodiment 3

[0054] The magnesium-containing wastewater used in this embodiment is cobalt smelting high-magnesium wastewater, wherein the main components are: Co 2+ : 0.91g / L, Ni 2+ : 1.12g / L, Mg 2+ : 45.32g / L, Cu 2+ : 0.00016g / L. Take 5L of raw high-magnesium wastewater, place it in an experimental container, heat it to 50°C, and adjust the pH to 4.0 with 32% liquid caustic soda; add sodium sulfide and sulfur that can provide sulfide ions that are 1.2 times the total molar amount of cobalt-nickel metal in the wastewater Sodium sulfide, the molar ratio of sodium sulfide and sodium thiosulfate is 6:1, the terminal potential is controlled at -98mV, and the reaction time is 1h; after the sulfide precipitation is completed, add 20% dilute sulfuric acid to adjust the pH to 7.0; then filter Separate, and add pure water to the filter residue with a liquid-solid ratio of 4:1 to rinse until the concentration of magnesium ions in circulating water that is 4 times the mass of the precipitate is no...

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Abstract

The invention discloses a heavy metal recovery method and precipitation method for magnesium-containing wastewater. The heavy metal recovery method comprises a sulfide precipitation step, wherein a sulfuration agent is added into the wastewater to achieve sulfide precipitation, and the sulfuration agent comprises a first sulfur ion source, and the first sulfur ion source comprises at least one kind selected from the combination consisting of a thiosulfate source, hydrogen sulfide and elemental sulfur. According to the heavy metal recovery method and the precipitation method, by using the sulfuration agent comprising the first sulfur ion source (slow-release sulfur ion source) selected from the thiosulfate source, hydrogen sulfide or elemental sulfur, and introducing the slow-release sulfuration process, sulfur ion release is buffered, the overreaction caused by the generation of a large number of sulfur ions is avoided, the sulfuration reaction is carried out controllably, magnesium is not prone to being clamped in sulfide precipitation particles, and therefore the effect of reducing magnesium-containing impurities of precipitate is achieved.

Description

technical field [0001] The present invention generally relates to the technical field of metal resource recovery and utilization, more specifically, to a heavy metal recovery method and sulfide precipitation method from magnesium-containing wastewater, and particularly to a cobalt / nickel recovery method and sulfide precipitation method from magnesium-containing wastewater. Background technique [0002] Cobalt is an important raw material for modern industry, especially an indispensable raw material composition for the positive electrode material of lithium cobalt oxide battery. [0003] Cobalt hydrometallurgy will add a large amount of magnesium oxide in the production process of intermediate products, so that the mass fraction of magnesium in the intermediate products is relatively high. Such intermediate products will produce a large amount of high-magnesium wastewater in the process of stripping with sulfuric acid in China. Magnesium wastewater contains a large amount of ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C02F1/52C02F101/20
CPCC22B23/00C22B7/00C02F1/5236C02F2101/20Y02P10/20
Inventor 王斌吕美玉牛全亮殷健强洪涛
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드
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