Hydrometallurgy industry raffinate waste water COD removal method

A technology of hydrometallurgy and raffinate, applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of no obvious removal effect, difficult degradation, and inability to further remove COD, etc., to achieve The effect of small dosage, lower COD, and low overall operating cost

Inactive Publication Date: 2015-12-30
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

The inventor's previous research found that oil separation, air flotation, resin and activated carbon adsorption technologies have no obvious effect on the removal of COD from various raffinate wastewater in the hydrometallurgical industry; using Fenton, electric Fenton, electrolytic oxidation, and ozone oxidation A variety of advanced oxidation technologies, such as advanced oxidation technology, can remove COD in raffinate wastewater to about 200mg / L at most, and it is still impossible to further remove COD to less than 100mg / L by activated carbon or activated coke adsorption
This shows that the organic matter in wastewater treated by Fenton and other advanced oxidation technologies is mainly small molecules with strong polarity, which are extremely difficult to further degrade

Method used

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  • Hydrometallurgy industry raffinate waste water COD removal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mixed waste water from copper and molybdenum extraction and recovery system of an enterprise, pH=0.69, COD1240mg / L, SO 4 2- The content is 109.5g / L, Cl - The content is 7.8g / L, NO 3 - The content is 210.5g / L. The main components of COD are a small amount of disperse oil, extractant N235 and LIX984, sulfonated kerosene and copper-molybdenum extract.

[0030] (1) Take 5000mL of the above wastewater, add slaked lime powder according to 1% of the theoretical dosage for removing all sulfate radicals, stir for 30 minutes, then let stand for 20 minutes, and filter to remove the generated calcium sulfate slag;

[0031] (2) The filtrate obtained in step (1) was adjusted to pH=1 with 10% dilute hydrochloric acid solution, the COD content was 1010mg / L, and the SO 4 2- The content is 108.5g / L;

[0032] (3) The solution obtained in step (2) is first added with 30% hydrogen peroxide, wherein H 2 o 2 The amount added is 1 times the mass concentration of COD, that is, 1.01g / L,...

Embodiment 2

[0037] Cobalt raffinate wastewater from a metallurgical enterprise in Zhejiang, pH=9.80, COD4580mg / L, SO 4 2- The content is 158.4g / L. The main components of COD are a small amount of dispersed oil, extractant P204, a small amount of emulsified and soluble sulfonated kerosene, and blue cobalt extract.

[0038] (1) Take 5000mL of the above wastewater, add slaked lime powder according to 50% of the theoretical dosage for removing all sulfate radicals, stir for 30 minutes, then let it stand for 20 minutes, and filter to remove the generated calcium sulfate slag;

[0039] (2) The filtrate obtained in step (1) was adjusted to pH=8 with 10% dilute hydrochloric acid solution, the COD content was 2540mg / L, and the SO 4 2- The content is 82.3g / L;

[0040] (3) The solution obtained in step (2) is first added with 30% hydrogen peroxide, wherein H 2 o 2 The amount added is twice the mass concentration of COD, that is, 5.08g / L, followed by the rapid addition of 30% ferrous sulfate so...

Embodiment 3

[0045] Raffinate wastewater from a rare earth company in Jiangxi, pH=6.58, COD960mg / L, PO 4 3- The content is 78.2g / L, Cl - The content is 18.3g / L, NO 3 - The content is 165.2.5g / L. The main components of COD are a small amount of dispersed oil, extractant TBP, sulfonated kerosene and rare earth extracts.

[0046] (1) Take 5000mL of the above wastewater, add slaked lime powder according to 100% of the theoretical amount for removing all phosphate radicals, stir and react for 30 minutes, then let it stand for 20 minutes, and filter to remove the generated calcium phosphate slag.

[0047] (2) The pH of the filtrate obtained in step (1) is 12, the COD content is 752mg / L, and the PO 4 3- The content is 1.7g / L;

[0048] (3) The solution obtained in step (2) is first added with 30% hydrogen peroxide, wherein H 2 o 2 The amount added is 5 times the mass concentration of COD, that is, 3.76g / L, followed by the rapid addition of 30% ferrous sulfate solution, Fe 2+ with H 2 o ...

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Abstract

The invention discloses a hydrometallurgy industry raffinate waste water COD removal method. According to the method, lime is added into waste water, and is combined with sulfate radical, phosphate radical, carbonate radical, fluorinions, metal ions and the like to generate defecation mud, the defecation mud is taken as an adsorber to remove dispersed oil in the waste water, filter liquor generated after filtering is subjected to pH regulation, then fenton oxidation is performed to degrade macromolecular organic compounds, further pH regulation is performed, then low molecular weight organic matters are deeply degraded by photo-catalytic oxidation, finally solid-liquid separation is performed to obtain a solid catalyst and waste water with the COD content smaller than 100mg/L, and the solid catalyst is returned to photo-catalytic oxidation reaction for cyclic utilization. The method is good in COD removal effect, free of adsorber regeneration and low in operation cost, and has industry application prospect.

Description

technical field [0001] The invention belongs to the field of metallurgical wastewater treatment, in particular to a method for removing COD from raffinate wastewater in the hydrometallurgical industry. Background technique [0002] There are two main industrial metallurgical methods, namely, pyrometallurgical method and wet method, among which hydrometallurgical technology is the most widely used. Hydrometallurgy technology refers to the transfer of various valuable elements from the solid phase to the liquid phase through the leaching process, and then separates and recovers the valuable components from the leachate through various effective methods. Separation and recovery of non-ferrous metals and rare earth elements from leachate by extraction is the most commonly used process in the hydrometallurgical industry. However, when the metal elements are recovered from the leachate by the extraction process, a large amount of raffinate wastewater will also be generated. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F103/16
Inventor 刘晨明林晓李志强
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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