Method for removing COD (chemical oxygen demand) from copper/molybdenum extraction raffinate mixed wastewater

A technology for mixing wastewater and raffinate, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of inability to remove small molecular substances, inability to remove dissolved organic matter, COD Reduce and other problems, to achieve the effect of low overall operating cost, small dosage, and low power consumption

Inactive Publication Date: 2015-12-16
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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Problems solved by technology

In order to realize the discharge of COD up to the standard, the inventor devoted himself to research, and the conventional air flotation technology was used to treat the wastewater, and the COD was not significantly reduced; only a small amount of dispersed oil in the water could be removed with activated carbon and other adsorption materials, and most of the dissolved organic matter could not be removed; after analysis , the highly polar dissolved organic matter in wastewater is mainly small molecules, and the experimental results prove that such small molecules cannot be completely removed by Fenton oxidation and other common oxidation techniques

Method used

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  • Method for removing COD (chemical oxygen demand) from copper/molybdenum extraction raffinate mixed wastewater

Examples

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Effect test

Embodiment 1

[0028] Mixed waste water from copper and molybdenum extraction and recovery system of an enterprise, pH=2.52, COD1240mg / L, SO 4 2- The content is 109.5g / L. (1) Take 5000mL of the above wastewater, add 15% milk of lime according to 1% of the theoretical dosage for removing all sulfate radicals, stir and react for 30 minutes, then let it stand for 20 minutes, and filter to remove the generated calcium sulfate slag;

[0029] (2) The filtrate obtained in step (1) was adjusted to pH=7 with 10% sodium hydroxide solution, the COD content was 450mg / L, and the SO 4 2- The content is 108.4g / L;

[0030] (3) The solution obtained in step (2) is first added with 2g / L of ZnO or ZnS as a catalyst, and then added with H 2 o 2 , where H 2 o 2 Dosing concentration is 1 times of influent COD mass concentration, namely 450mg / L. Catalytic oxidation is then carried out under the irradiation of light with a wavelength of 190 nm. The oxidation reaction temperature is 20°C, and the reaction t...

Embodiment 2

[0033] Wastewater from molybdenum extraction and recovery system of a copper mine enterprise, pH=1.25, COD2000mg / L, SO 4 2- The content is 202.3g / L.

[0034] (1) Take 5000mL of the above wastewater, add 15% milk of lime according to 10% of the theoretical dosage for removing all sulfate radicals, stir for 40 minutes, then let it stand for 30 minutes, and filter to remove the generated calcium sulfate slag;

[0035] (2) The filtrate obtained in step (1) was adjusted to pH=9 with 10% sodium hydroxide solution, the COD content was 750mg / L, and the SO 4 2- The content is 188.2g / L;

[0036] (3) Add 0.1g / L of ZnO and SnO to the solution obtained in step (2) 2 Two-component catalyst (ZnO and SnO 2 The mass ratio is 2:1), then add H 2 o 2 , where H 2 o 2 Dosing concentration is twice the mass concentration of influent COD, that is, 1.5g / L. Then catalyze oxidation under light with a wavelength of 350nm, the oxidation reaction temperature is 70°C, and the reaction time is 10mi...

Embodiment 3

[0039] Wastewater after neutralization of copper extraction and recovery system of an enterprise in Sichuan, pH=12, COD229mg / L, SO 4 2- The content is 1g / L.

[0040] (1) Take 5000mL of the above wastewater, add quicklime according to 200% of the theoretical dosage for removing all sulfate radicals, stir for 40 minutes, then let it stand for 30 minutes, and filter to remove the generated calcium sulfate slag;

[0041] (2) The filtrate obtained in step (1) was adjusted to pH=5 with 10% dilute hydrochloric acid solution, the COD content was 185mg / L, and the SO 4 2- The content is 0.05g / L;

[0042] (3) Add 0.5g / L of ZnS and ZrS to the solution obtained in step (2) 2 Two-component catalyst (ZnS and ZrS 2 The mass ratio is 1:1), then adding H 2 o 2 , where H 2 o 2 Dosing concentration is 3 times of influent COD mass concentration, namely 555mg / L. Then carry out catalytic oxidation under light with a wavelength of 780nm, the oxidation reaction temperature is 35°C, and the r...

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Abstract

The invention discloses a method for removing COD (chemical oxygen demand) from copper / molybdenum extraction raffinate mixed wastewater, which mainly comprises the following steps: adding lime powder or lime milk into wastewater so as to be combined with sulfate in the wastewater to generate a calcium sulfate precipitate, adsorbing and removing disperse oil by using the calcium sulfate as an adsorbent, filtering, deeply degrading COD in the filtrate in the photocatalytic oxidation reaction process, and carrying out solid-liquid separation to obtain the solid catalyst and the wastewater with the COD of less than 100 mg / L, wherein the solid catalyst can be returned to the photocatalytic oxidation reaction for cyclic utilization. The method has the advantages of simple technique, low operating cost and no need of subsequent adsorbent regeneration, and has favorable market prospects.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgical wastewater treatment, in particular to a method for removing COD from copper and molybdenum raffinate mixed wastewater. Background technique [0002] In the field of non-ferrous metallurgy, hydrometallurgy technology is widely used, that is, through chemical leaching first, and then by selecting the most suitable extraction agent, the extraction, separation and recovery of the required metal elements will be realized. When the production target is achieved, a large amount of The effective treatment of this type of wastewater is of great significance to environmental protection. [0003] In actual production, the extraction system composed of oxime extractant LIX984 and sulfonated kerosene is often used to extract copper from the solution, and the system composed of N235 and kerosene is used as the organic phase to extract and recover molybdenum from the molybdenum-containing solution. In o...

Claims

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Application Information

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