Method and device for reducing metal dissolution in domestic waste incinerator slag

A domestic waste incineration and slag technology, which is applied in the field of environmental protection technology and solid waste resource recovery, can solve problems such as surrounding environmental pollution, achieve low investment and operating costs, reduce metal dissolution, and enhance reactivity and volatility.

Active Publication Date: 2018-04-13
姚俊 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The leaching of heavy metals during the recycling process of domestic waste incineration slag will lead to the pollution of the surrounding environment, which has become one of the important issues restricting the reuse of domestic waste

Method used

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  • Method and device for reducing metal dissolution in domestic waste incinerator slag
  • Method and device for reducing metal dissolution in domestic waste incinerator slag
  • Method and device for reducing metal dissolution in domestic waste incinerator slag

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Embodiment 1

[0060] Crush domestic waste incinerator slag to a particle size of less than 5mm. Take domestic waste incinerator slag in a reaction kettle (2 / 3 height), pour 30% citric acid from the feed port until completely submerged in domestic waste incinerator slag, and soak for 12 hours. Thereafter, according to the domestic waste incineration slag and MgCl 2 Add MgCl at a mass ratio of 15:1 2 , turn on the mixer, stir well, make MgCl 2 Mix thoroughly with domestic waste incinerator slag. Turn on the thermocouple, raise the temperature to 700°C, and turn on the carrier gas (N 2 ) valve, domestic waste incineration slag reacted at high temperature in the reactor for 2 hours. The outlet gas during the reaction is connected to the condenser. In the condenser, the metal chlorides are condensed and collected for recycling. The outlet gas of the condenser passes through the tail gas purification device, and the tail gas purification device is equipped with lye for the absorption of aci...

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Abstract

The invention discloses a method for reducing metal dissolution in domestic waste incinerator slag. The method comprises the following steps that (1) domestic waste incinerator slag particles are crushed into particles with the particle size below 5 mm; (2) the crushed domestic waste incinerator slag is put into a reaction kettle, and citric acid solution is added until the crushed domestic wasteincinerator slag is just immersed for soaking; (3) MgCl2 is added into the reactor kettle, a reaction kettle heater is started to make the temperature in the reaction kettle reach 650-750 DEG C, meanwhile, carrier gas is stared, heat preservation is conducted for 1.5-2.5h, then the temperature is further raised to 900-950 DEG C, heat preservation is conducted for 1.5-2.5h, and gas in the reactionkettle is exhausted from an exhaust pipe, enters a condenser, and then enters a tail gas purifying device for being exhausted; and (4) the reaction kettle after the heat reaction is finished is cooledto the room temperature, the domestic waste incinerator slag is taken out, and condensation products at different heat preservation stages in the condenser serve as metal enriched products and are recycled in batched. The method for reducing metal dissolution in the domestic waste incinerator slag can reduce metal dissolution in the domestic waste incinerator slag, and meanwhile, metal in the domestic waste incinerator slag is recycled.

Description

technical field [0001] The invention relates to the field of environmental protection technology and recovery of solid waste resources, in particular to a treatment method for domestic waste incineration slag, which reduces the dissolution of metals in the domestic waste incineration slag and simultaneously recovers the metals in the domestic waste incineration slag. Background technique [0002] Incineration has become one of the main treatment methods of municipal solid waste. As of 2016, my country has a total of 220 domestic waste incineration plants, processing 61.755 million tons of domestic waste every year. According to statistics, every ton of domestic waste incinerated by a waste incineration plant produces 0.2 tons of domestic waste incineration slag. It is estimated that my country produces more than 12 million tons of domestic waste incineration slag every year. Domestic waste incineration slag has become an important waste stream in my country's cities. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00
CPCC22B7/001C22B7/007
Inventor 姚俊王江章志诚钱易孔庆娜
Owner 姚俊
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