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Method for treating lead-zinc sulfide ore production wastewater and recycling zinc from wastewater

A technology for the production of wastewater and sulfide ore, which is applied in mining wastewater treatment, zinc sulfide, chemical instruments and methods, etc., can solve the problems of secondary heavy metal pollution, regional surface water pollution, difficult treatment, etc., and achieve the effect of good pH buffering characteristics

Inactive Publication Date: 2013-09-18
中国有色桂林矿产地质研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lime neutralization and its derivative methods are the most commonly used in the existing neutralization precipitation method. The defects in these methods are: (1) the pH value of the wastewater is not easy to control; (2) the valuable metals in the wastewater cannot be recovered as products (3) A large amount of waste residues containing various heavy metals are produced, resulting in processing difficulties and possible secondary heavy metal pollution
For specific lead-zinc sulfide ores, due to the multi-metal and multi-component mineral occurrence characteristics of lead-zinc sulfide ores, in mining production activities, production wastewater is often acidic and contains a certain amount of heavy metals such as Fe, Zn, and Cd. Pollutants, if the treated mining wastewater does not meet the standard, it will be discharged. In addition to the above-mentioned problems, it will also pollute the regional surface water body, and cause the regional groundwater body, farmland and ecological environment to be polluted by heavy metals to varying degrees, and then through the food chain. human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1) Take 6L of lead-zinc mine production wastewater (including Zn837mg / L, Fe593mg / L, Cd4.15mg / L, pH value 2.8), put it in the stirring tank, add natural calcium carbonate ore with a particle size of 3-5mm ( CaCO 3 Content is 90%) 0.5kg, stir 1h, the pH value of waste water at this moment is 6.3, filter, the isolated unreacted natural calcium carbonate ore stays for next use, in the separated filtrate, add the concentration that is 1% PAM aqueous solution (PAM molecular weight is 3,000,000, and its solid dosage is calculated by adding 5 grams per ton of waste water), stirred for 1 min to form iron hydroxide flocculation precipitation, filtered to obtain iron removal waste water and iron hydroxide slag respectively;

[0058] 2) Add 10% Na simultaneously in step 1) in the iron removal waste water of gained 2 150ml of S aqueous solution and 1% concentration of flocculated PAM aqueous solution (PAM molecular weight is 3 million, and its solid dosage is calculated by adding 5...

Embodiment 2

[0061] 1) Take 40L of waste water from lead-zinc mine production (including Zn54mg / L, Fe136mg / L, Cd0.17mg / L, pH 4.3), put it in a stirring tank and add 0.5-1.0mm calcium carbonate ore (CaCO 3 Content is 90%) 5kg, stir 5h, the pH value of waste water at this moment is 6.5, filter, and the separated unreacted natural calcium carbonate ore stays for next use, in the separated filtrate, add the concentration and be 1%PAM aqueous solution (PAM molecular weight is 3,000,000, and its solid dosage is calculated by adding 10 grams per ton of waste water), stirring for 3 minutes, forming iron hydroxide flocculation precipitation, filtering, and obtaining iron removal waste water and iron hydroxide slag respectively;

[0062] 2) Add 5% Na in the iron removal waste water of step 1) gained 2 S aqueous solution 150ml, after 2 minutes, add concentration again and be 1% PAM aqueous solution (PAM molecular weight is 3,000,000, its solid consumption is calculated by adding 2 grams per ton of wa...

Embodiment 3

[0065] 1) Take 1000L of waste water from lead-zinc mine production (including Zn688mg / L, Fe786mg / L, Cd3.62mg / L, pH 2.6), put it in a stirring tank and add 5-20mm calcium carbonate ore (CaCO 3 Content is 65%) 60kg, stir 15h, the pH value of waste water at this moment is 6.5, filter, and the natural calcium carbonate ore that isolates has not reacted and stays for next use, in the separated filtrate, add the concentration and be 1% PAM aqueous solution (PAM molecular weight is 5,000,000, and its solid dosage is calculated by adding 10 grams per ton of waste water), stirred for 10 minutes, formed iron hydroxide flocculation precipitation, filtered, and obtained iron removal waste water and iron hydroxide slag respectively;

[0066] 2) Add 4000ml of 15% NaHS aqueous solution to the iron removal wastewater obtained in step 1), and then add 1% PAM aqueous solution after 8 minutes (the molecular weight of PAM is 5 million, and the solid dosage is calculated by adding 8 grams per ton o...

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Abstract

The invention discloses a method for treating lead-zinc sulfide ore production wastewater and recycling zinc from wastewater. The method comprises the following steps of: 1) adding calcium carbonate ore into the lead-zinc sulfide ore production wastewater, stirring and reacting till the pH value of the wastewater is within 6.0-7.0, filtering, adding a flocculant into the obtained filtrate, stirring, standing, precipitating, and filtering so as to respectively obtain the de-ironed wastewater and ferric hydroxide slag; 2) adding sulfide and the flocculant into the de-ironed wastewater, stirring, standing, precipitating, and filtering so as to respectively obtain dezinced and de-ironed wastewater and zinc slag, wherein the sulfide is sodium sulfide or sodium bisulfide, and the sulfide is added in a solution manner; and 3) adding ferric hydroxide slag into the dezinced and de-ironed wastewater to react up, and filtering, wherein the filtrate can meet the discharge standard. The method is simple to operate, the discharge water treated by using the method can meet relevant national water discharge standard, and the recycling of heavy metal resource products and up-to-standard emission of wastewater are realized.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a method for treating lead-zinc sulfide ore production waste water and recovering zinc from the waste water. Background technique [0002] At present, neutralization precipitation method, sulfide precipitation flotation method, ion exchange method, electrochemical method, biological method and other methods are mainly used for the treatment of non-ferrous metal mine wastewater. Among them, neutralization precipitation method has the advantages of simple process, reliability and low treatment cost. It is the most commonly used method. This method is mainly to increase the pH value of the wastewater by adding alkaline substances such as lime or sodium hydroxide or sodium carbonate, so that the heavy metal ions in the wastewater form a hydroxide or a hydroxide with a very small solubility. Carbonate is removed by precipitation. Lime neutralization and its derivative m...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G9/08C01G11/02C01G21/21C01G49/12C02F103/10
Inventor 覃朝科卢宗柳董书秋宁春旭孙伟陈斌强
Owner 中国有色桂林矿产地质研究院有限公司
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