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Method of recycling mercury in sludge polluted by mercury through heat treatment

A mercury pollution and sludge technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem of limited mercury pollution treatment capacity, achieve good removal effect, The effect of controlling environmental pollution and saving energy consumption

Inactive Publication Date: 2017-01-11
佛山慧创正元新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method can deal with a variety of heavy metal pollutants, but the treatment capacity for higher concentrations of mercury pollution is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for recovering mercury by thermal treatment of mercury-polluted sludge, comprising the following steps:

[0020] (1) Put the sludge into the reactor, add hot water and stir thoroughly, then add polyferric aluminum chloride and stir to dissolve, then transfer it to a stacked dehydrator for dehydration, after dehydration, flow out the bottom sludge and send it to the dryer In a dry unit, tumble dry. Dried to a moisture content of 35%;

[0021] (2) Place the dried sludge in a pyrolysis furnace at an environment with a temperature of 680°C and a vacuum of 90kPa. After pyrolysis for 70 minutes, raise the temperature to 1100°C for calcination. After the calcination is completed, the The generated ash is discharged at the bottom of the pyrolysis furnace, and the mercury-containing flue gas enters the drying device after the calcination is completed, and is used as a heat source to dry the sludge;

[0022] (3) The mercury-containing flue gas that has been calcined is...

Embodiment 2

[0025] A method for recovering mercury by thermal treatment of mercury-polluted sludge, comprising the following steps:

[0026] (1) Put the sludge into the reactor, add hot water and stir thoroughly, then add polyphosphorus aluminum chloride and stir to dissolve, then transfer it to a stacked dehydrator for dehydration, after dehydration, flow out the bottom sludge and send it to drying device, dry. Dried to a moisture content of 40%;

[0027] (2) Place the dried sludge in a pyrolysis furnace at a temperature of 730°C and a vacuum of 110kPa. After pyrolysis for 60 minutes, raise the temperature to 850°C for calcination. After the calcination is completed, the The generated ash is discharged at the bottom of the pyrolysis furnace, and the mercury-containing flue gas enters the drying device after the calcination is completed, and is used as a heat source to dry the sludge;

[0028] (3) The mercury-containing flue gas that has been calcined is subjected to dust removal treatm...

Embodiment 3

[0031] A method for recovering mercury by thermal treatment of mercury-polluted sludge, comprising the following steps:

[0032] (1) Put the sludge into the reactor, add hot water and stir thoroughly, then add polyphosphorus ferric chloride and stir to dissolve, then transfer it to a centrifugal dehydrator for dehydration, after dehydration, flow out the bottom sludge and send it to drying device, dry. Dried to a moisture content of 45%;

[0033] (2) Place the dried sludge in a pyrolysis furnace at an environment with a temperature of 680°C and a vacuum of 110kPa. After pyrolysis for 50 minutes, raise the temperature to 900°C for calcination. After the calcination is completed, the The generated ash is discharged at the bottom of the pyrolysis furnace, and the mercury-containing flue gas enters the drying device after the calcination is completed, and is used as a heat source to dry the sludge;

[0034] (3) The mercury-containing flue gas that has been calcined is subjected ...

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PUM

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Abstract

The invention discloses a method of recycling mercury in sludge polluted by mercury through heat treatment. The method comprises the following steps: preprocessing the sludge polluted by mercury by adding a flocculating agent, dehydrating and drying, and then carrying out subsection treatment and spraying cooling to remove the mercury in the sludge, thereby recycling the mercury in the sludge. According to the treatment method, the process is simple, the operation is simple and convenient, the treatment efficiency is high and the cost is relatively low. Meanwhile, the treatment method has the advantages that the removal efficiency of mercury pollutants is high; the mercury in the sludge can be fully removed and recycled, thereby alleviating the pollution of sludge to environments and damage to human bodies.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for recovering mercury by heat treatment of mercury-polluted sludge. Background technique [0002] Mercury is a highly toxic metal and one of the environmental pollutants that is widely concerned in the world. Mercury pollution will cause serious harm to human health and is the cause of "Minamata disease". Mercury pollution has the characteristics of easy migration, strong persistence, strong toxicity and high bioaccumulation, and various forms of mercury in the environment can be converted into highly toxic methylmercury under certain conditions. During the development of natural gas, because the gas field contains mercury, a large amount of mercury-containing sludge will be produced. If the mercury-containing sludge is discharged without treatment, it will bring serious harm to the environment. [0003] The commonly used removal methods of mercury in sludge can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/00C02F11/12B01D53/00B01D53/04
CPCY02W10/40C02F11/10B01D53/002B01D53/04B01D2253/102B01D2257/602C02F11/00C02F11/004C02F11/12C02F11/127C02F2101/20
Inventor 叶青
Owner 佛山慧创正元新材料科技有限公司
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