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A method for treating mining and metallurgical heavy metal wastewater by using waste tea chips

A heavy metal and wastewater technology, applied in mining wastewater treatment, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve the problems of unutilized and waste of useful resources, and achieve the effects of low cost, accelerated sedimentation, and increased particle diameter.

Inactive Publication Date: 2016-04-20
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2009, the discarded tea dregs produced by my country's tea beverage processing reached 150,000 tons. At the same time, about 30% of the tea trees are used as waste branches and leaves and tea powder during the process of trimming, picking and processing each year. waste of resources

Method used

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  • A method for treating mining and metallurgical heavy metal wastewater by using waste tea chips
  • A method for treating mining and metallurgical heavy metal wastewater by using waste tea chips
  • A method for treating mining and metallurgical heavy metal wastewater by using waste tea chips

Examples

Experimental program
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Embodiment 1

[0029] A method for treating mining and metallurgy heavy metal wastewater by using waste tea scraps, comprising the following steps:

[0030] After the mining and metallurgy heavy metal wastewater is filtered to remove solids, add alkaline substances to adjust the pH to 8-9, stir and mix, and then filter to remove a large number of heavy metal ions in the mining and metallurgy wastewater. Obtain heavy metal wastewater from mining and metallurgy after precipitation;

[0031] After heavy metal wastewater from mining and metallurgy is precipitated by alkaline substances, its heavy metal composition (mg / L): Cd 6+ 78.3, Cr 6+ 27.1, Cr 3+ 65.4, Hg 2+ 56.3, Pb 2+ 82.3, Zn 2+ 68.9, Cu 2+ 43.4, Ag + 32.5.

[0032] In the heavy metal wastewater from mining and metallurgy after the above precipitation, add 50 mesh waste tea scraps according to 1 times the total amount of separated heavy metals, adjust the pH value of the system to 3.0, stir for 30 minutes, enter the secondary sep...

Embodiment 2

[0034] A method of utilizing waste tea scraps to process heavy metal wastewater from mining and metallurgy, according to the method described in Example 1, after the heavy metal wastewater from mining and metallurgy is precipitated by alkaline substances, its heavy metal composition (mg / L): Cd 6+ 69.5, Cr 6+ 34.2, Cr 3+ 85.4, Hg 2+ 60.2, Pb 2+ 79.3 Zn 2+ 64.3, Cu 2+ 58.6, Ag + 29.5.

[0035] Add 100-mesh waste tea scraps to the heavy metal wastewater from mining and metallurgy after precipitation, which is 50 times the total amount of separated heavy metals, adjust the pH value of the system to 5.0, stir for 80 minutes, enter the secondary separation pool, and add anions with a concentration of 1g / ml Polyacrylamide aqueous solution 0.5ml / L, let it stand for 40 minutes, take the clear liquid and test its composition (mg / L): Cd 6+ 0.67, Cr 6+ 0.21, Cr 3+ 0.68, Hg 2+ 0.16, Pb 2+ 0.76, Zn 2+ 1.04, Cu 2+ 0.62, Ag + 1.12, pH 6.1.

Embodiment 3

[0037] A method of utilizing waste tea scraps to process heavy metal wastewater from mining and metallurgy, according to the method described in Example 1, after the heavy metal wastewater from mining and metallurgy is precipitated by alkaline substances, its heavy metal composition (mg / L): Cd 6+ 8.25, Cr 6+ 0.98, Cr 3+ 5.67, Hg 2+ 3.27, Pb 2+ 5.53, Zn 2+ 2.86, Cu 2+ 4.23 Ag + 0.77.

[0038] Add 200-mesh waste tea scraps to the heavy metal wastewater from mining and metallurgy after precipitation, which is 100 times the total amount of heavy metals separated, adjust the pH value of the system to 7.0, stir for 120 minutes, enter the secondary separation tank, and add anions with a concentration of 1g / ml Polyacrylamide aqueous solution 1ml / L, let it stand for 60 minutes, take the clear liquid and test its composition (mg / L): Cd 6+ 0.23, Cr 6+ 0.56, Cr 3+ 0.26, Hg 2+ 0.27, Pb 2+ 0.31, Zn 2+ 0.33, Cu 2+ 0.14, Ag + 0.24, pH 7.4.

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Abstract

The invention discloses a method for treating heavy metal wastewater in mining and metallurgy by use of waste tea dust, which is characterized by comprising the steps of filtering the mining and metallurgy wastewater through a grid to remove solid matters, adding alkali to adjust the pH value to 8-9, and filtering to remove precipitates; adding tea dust 1-100 times the total mass of heavy metal and with particle sizes of 50-200 meshes into the precipitated mining and metallurgy wastewater, adding acid to adjust the pH value to 3-7, and stirring and mixing for 30-120 minutes; transferring the mixed liquid into a two-level separation tank, adding a flocculating agent at a proportion of 0-2ml per liter of mixed liquid, stirring for 5-10 minutes, and standing for 30-60 minutes, wherein the flocculating agent is an aqueous solution of anionic polyacrylamide with concentration of 1g / liter; overflowing the supernate of the precipitated mixed liquid, and recovering or discharging. The method disclosed by the invention has a good treatment effect on heavy metal ions and radionuclide, and can be applied to the environmental protection and repair treatment in the mining and metallurgy, chemical industry, electroplating and mechanical industry.

Description

technical field [0001] The invention belongs to the treatment of waste water, and relates to a method for treating mining and metallurgy heavy metal waste water by using waste tea scraps. It is especially suitable for the treatment of mining and metallurgy heavy metals (mercury, cadmium, arsenic, lead, copper, zinc, chromium and other heavy metals) and radionuclide wastewater, and can be widely used in environmental protection and restoration of mining and metallurgy, chemical industry, electroplating, and machinery industries. deal with. Background technique [0002] The mining and smelting of non-ferrous metals has always been a large water user in my country. Because most of the non-ferrous metals and ores have associated elements, the wastewater from mining and smelting generally contains heavy metals such as mercury, cadmium, arsenic, lead, copper, zinc, and chromium. . The content of heavy metals per unit volume in wastewater discharged from nonferrous metallurgy is n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/56C02F101/20C02F103/10C02F103/16
Inventor 周建苏林李卫锋罗学刚
Owner SOUTHWEAT UNIV OF SCI & TECH