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Solidification/stabilization method for mercury-containing hazardous waste

A hazardous waste and stabilization technology, which is applied to the treatment of mercury-containing hazardous wastes, can solve problems such as low mercury adsorption capacity, and achieve the effects of simple operation process, high efficiency and low cost.

Inactive Publication Date: 2012-07-18
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of natural zeolites is the low adsorption capacity for mercury

Method used

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  • Solidification/stabilization method for mercury-containing hazardous waste
  • Solidification/stabilization method for mercury-containing hazardous waste
  • Solidification/stabilization method for mercury-containing hazardous waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Preparation of mercapto-functionalized zeolite: according to the mass g of natural clinoptilolite and 0.1mol L -1 The volume mL ratio of the hydrochloric acid solution is 1:5, soak the natural clinoptilolite in 0.1mol·L -1 HCl solution, heated at 80°C for 24h, centrifuged and filtered, the solid material was rinsed with deionized water, and the cleaning solution was tested with silver nitrate until there was no white flocculent precipitate of silver chloride in the cleaning solution, and dried at 60°C Overnight, obtain hydrogen type zeolite; According to the quality g of hydrogen type zeolite: the quality g of 3-mercaptopropyltrimethoxysilane: the volume mL ratio of anhydrous toluene is 1: 1: 50, mix hydrogen type zeolite and 3-mercapto Propyltrimethoxysilane was added to anhydrous toluene, refluxed at 110°C for 10 hours, and centrifuged to filter. The mercapto-functionalized zeolite wool obtained was washed with toluene and ethanol successively, and then eluted in e...

Embodiment 2

[0026] Embodiment 2: described step 3) solidification / stabilization operation of mercury-containing hazardous waste: according to the mercury content value obtained in step 2), 10.0g contains mercury 100mg·kg -1 Add 50mL of deionized water and 1g of mercapto-functionalized zeolite to the mercury-containing hazardous waste, adjust the pH to 4, and the rest are the same as in Example 1

[0027] The measurement results showed that the concentration of mercury leached from mercury-containing hazardous waste was changed from the initial 4.14mg·L -1 reduced to 0.02mg·L -1 , which is lower than the leached mercury concentration of 0.1mg·L stipulated in the Chinese national standard GB5085.3-2007 -1 The standard value, the curing efficiency is greater than 99%.

Embodiment 3

[0028] Embodiment 3: described step 3) solidification / stabilization operation of mercury-containing hazardous waste: according to the mercury content value obtained in step 2), 10.0g contains mercury 1000mg·kg -1 Add 50mL of deionized water and 10g of mercapto-functionalized zeolite to the mercury-containing hazardous waste, adjust the pH to be 6, and the rest are the same as in Example 1

[0029] The measurement results showed that the concentration of mercury leached from mercury-containing hazardous waste was changed from the initial 13.92mg·L -1 reduced to 0.09mg·L -1 , which is lower than the leached mercury concentration of 0.1mg·L stipulated in the Chinese national standard GB5085.3-2007 -1 The standard value, the curing efficiency is greater than 99%.

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Abstract

The invention provides a solidification / stabilization method for mercury-containing hazardous waste. (3-Mercaptopropyl)trimethoxysilane is adopted to assemble by self on the surface of natural clinoptilolite to obtain thiol functional zeolite with high adsorption capacity on the mercury. The solidification / stabilization method for the mercury-containing hazardous waste is characterized in that chemical bond phosphate ceramic serves as curing agent, and the thiol functional zeolite serves as stabilizing agent. Under the condition that pH is 4-6, more than 99% of mercury in the mercury-containing hazardous waste is solidified / stabilized at the room temperature, and the mercury leaching concentration is lowered to be below the 0.1mg.L-1 standard value of the leaching mercury concentration in the Chinese national standard GB5085.3-2007. The method disclosed by the invention is simple, is low in cost and has high solidification / stabilization efficiency for the mercury-containing hazardous waste. The solidification / stabilization method for the mercury-containing hazardous waste is suitable for disposing the mercury-containing hazardous wastes, such as soil, deposit sediments and slag and also can be used for processing the mercury-containing hazardous waste, such as other industrial sources, chlorine-alkali production, electric wire equipment and switch manufacture, zinc-copper smelting and gold mine mining.

Description

technical field [0001] The invention relates to a treatment technology for mercury-containing hazardous waste, which belongs to the field of waste treatment technology and environmental protection, and specifically relates to a solidification / stabilization method for mercury-containing hazardous waste. Background technique [0002] The heavy metal mercury is one of the six internationally recognized poisons, and the treatment of mercury-containing hazardous waste has been widely concerned and valued by people. Because mercury can exist in the environment for a long time, and may transform from inorganic mercury to more toxic organic mercury, and then pass and accumulate along the food chain, mercury-containing hazardous waste poses a great threat to the surrounding environment and human health. Therefore, the development of reliable technology to strictly control the leaching of mercury in these mercury-containing hazardous wastes, so that it cannot migrate into the environm...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 张少庆张新艳王国平张玉霞
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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