A kind of arsenic-removing adsorbent in the pyrolysis process of urban waste

A technology for treating process and urban waste, applied in solid waste removal, chemical instruments and methods, transportation and packaging, etc., can solve the problem of inability to meet the harmless requirements of removing arsenic poisons, low ability to remove reduced arsenic, removal of arsenic Limited effect and other problems, to achieve the effect of increasing active adsorption sites, low cost, and increasing adsorption capacity

Active Publication Date: 2021-12-14
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before heat treatment, waste components with high metal content will be sorted out to reduce their sources. This method can effectively recover some precious metals and other useful metals, but manual sorting is required, which is time-consuming and expensive, and the processing cost is high; pyrolysis Most of the gasification gas is incinerated to recover its energy in the form of heat. The required tail gas treatment device is similar to incineration, which occupies a large area and requires high investment.
[0005] As a natural adsorbent, kaolin has a wide range of sources and low economic cost, but the ability of pure kaolin to remove reduced arsenic is low, and cannot meet the harmless requirements of removing arsenic poisons
In order to improve the adsorption effect, it is a common method to modify the solid adsorbent by physical and chemical means to obtain a high-efficiency solid adsorbent, but this method is relatively simple and the removal effect is limited

Method used

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  • A kind of arsenic-removing adsorbent in the pyrolysis process of urban waste
  • A kind of arsenic-removing adsorbent in the pyrolysis process of urban waste
  • A kind of arsenic-removing adsorbent in the pyrolysis process of urban waste

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Configure 0.2M copper acetate solution, 1M sodium hydroxide solution and add 5% isopropanol to it. After fully reacting, take a water bath at 65°C, age for 2 hours, centrifugally filter, wash with deionized water and precipitate in a muffle furnace Calcined at 400°C for 2 hours, then ground to obtain nano-copper oxide powder. Take 0.1g nano-CuO (ultrasonic 6min, ultrasonic frequency 15kHz) and pour it into 3% cetyltrimethylammonium bromide aqueous solution, sonicate in an ultrasonic cell pulverizer for 6min, ultrasonic frequency 15kHz to disperse to form CuO sol;

[0033] (2) Dry the kaolin in an oven at 105°C, take out 7g of dried kaolin powder from the oven, add it to the nano-CuO sol, ultrasonicate, take out the mixed solution and stir, filter, wash and dry to prepare the arsenic-removing adsorbent. The mass ratio of kaolin to nano copper oxide is 70:1; the ultrasonic time is 12min, the ultrasonic frequency is 25kHz; the stirring time is 15min, the washing times ...

Embodiment 2

[0034] Example 2 An arsenic-removing adsorbent in the process of pyrolysis treatment of urban waste, characterized in that it is prepared and obtained by the following method:

[0035] (1) Weigh copper acetate, sodium hydroxide and kaolin, fully dissolve copper acetate in deionized water, dissolve sodium hydroxide in 5% isopropanol solution; keep stirring the copper solution, and slowly add hydrogen into the solution at the same time The isopropanol solution of sodium oxide is fully stirred and aged in a water bath; the obtained copper hydroxide precipitate is centrifugally filtered, washed with water first, then washed with ethanol, dried in an oven at 80°C, calcined, and ground to obtain nano CuO powder; add nano-CuO powder to 3% cetyltrimethylammonium bromide aqueous solution, and ultrasonically disperse to form CuO sol; the temperature of the water bath is 55°C, the aging time is 2h; the drying time is 1h ; The calcination temperature is 350° C., the ultrasonic time is 5 m...

Embodiment 3

[0037] Example 3 An arsenic-removing adsorbent in the process of pyrolysis treatment of urban waste, characterized in that it is prepared and obtained by the following method:

[0038](1) Weigh copper acetate, sodium hydroxide and kaolin, fully dissolve copper acetate in deionized water, dissolve sodium hydroxide in 5% isopropanol solution; keep stirring the copper solution, and slowly add hydrogen into the solution at the same time The isopropanol solution of sodium oxide is fully stirred and aged in a water bath; the obtained copper hydroxide precipitate is centrifugally filtered, washed with water first, then washed with ethanol, dried in an oven at 80°C, calcined, and ground to obtain nano CuO powder; add nano-CuO powder to 3% cetyltrimethylammonium bromide aqueous solution, and ultrasonically disperse to form CuO sol; the temperature of the water bath is 80°C, the aging time is 4h; the drying time is 2h ; The calcination temperature is 500° C., the ultrasonic time is 10 m...

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Abstract

The invention provides an arsenic-removing adsorbent in the pyrolysis treatment process of urban garbage. The main components of the additive are nano-copper oxide and kaolin, wherein the nano-copper oxide is the main active component, which can significantly enhance the chemical adsorption of kaolin to arsenic. The prepared composite additive has the advantages of good thermal stability and high treatment efficiency. Compared with other composite additives, the experiment shows that the additive has a higher adsorption capacity and combines the traditional advantages of cheap and easy-to-obtain kaolin.

Description

technical field [0001] The invention mainly reduces the content of the arsenic waste gas in the toxic waste gas produced by pyrolysis and gasification of municipal solid waste, so as to achieve the purpose of harmless treatment, and belongs to the field of solid waste treatment. Background technique [0002] Garbage comes from a wide range of sources, most of which are generated in people's daily life, and also include some highly polluting and difficult-to-degrade hazardous waste, both of which contain various heavy metals, such as lead Pb, cadmium Cd, chromium Cr, arsenic As, Copper Cu, zinc Zn, etc. Among them, arsenic is a highly toxic substance that can cause varying degrees of damage to the human heart, lung, respiratory, and immune systems. The semi-lethal dose of arsenite is 14 mg / kg. The pyrolysis of garbage will inevitably cause the release of these heavy metals, which will endanger human health. [0003] At present, many treatments for arsenic pollution are divi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/33B09B3/00A62D101/40
CPCA62D3/33A62D2101/40A62D2203/02B09B3/40
Inventor 仲兆平汪宁波杜浩然
Owner SOUTHEAST UNIV
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