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Method for jointly stabilizing fly ash and arsenic-containing waste

A fly ash and waste technology, applied in the field of hazardous waste stabilization treatment, can solve the problems of high cost and large capacity increase ratio, and achieve the effects of reducing environmental risks, saving storage capacity and having strong practicability.

Active Publication Date: 2010-05-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a method for co-stabilizing arsenic-containing waste and fly ash to solve the problems of large capacity increase ratio and high cost of conventional methods, and to treat waste with waste

Method used

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  • Method for jointly stabilizing fly ash and arsenic-containing waste

Examples

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Effect test

Embodiment 1

[0017] The objects of treatment are arsenic-containing tailings slag from a chemical plant and fly ash from a flue gas purification system of a municipal solid waste incineration plant. The arsenic slag is in the form of yellow mud. Its water content, pH, and redox potential were tested, and its main element composition, mineral composition, and heavy metal leaching toxicity were analyzed. The results are as follows: the moisture content of the arsenic slag is 81.4%, the pH is 1.53, and the redox potential is -84mV , X-ray diffractometer (XRD) detects arsenic mainly as As 2 o 3 The main components of arsenic slag are As, S, and Cd as measured by X-ray fluorescence spectrometer (XRF). The toxic leaching method of solid waste leaching in my country——acetic acid buffer solution method (HJ / T 300-2007) leaching, inductive coupling Plasma emission spectrometer (ICP) measures metal ion concentration, obtains the leaching concentration of As 1501.5mg / L, the leaching concentration of C...

Embodiment 2

[0021] The properties and proportions of fly ash and arsenic slag are the same as in Example 1. Add the regulating solution, control the mass ratio of the regulating solution to the mixed solid of fly ash and arsenic slag to be 4:6, and mechanically stir for 5 minutes at room temperature until uniform. The leaching concentration of heavy metals such as Pb, Se, Cd, Ni in the mixture measured by the same method as in Example 1 is lower than the national hazardous waste identification standard, the heavy metal pollution of the fly ash itself is controlled, and the As leaching concentration in the arsenic slag is reduced simultaneously To 28.3mg / L, compared with untreated leaching concentration decreased by 98.1%. In addition, the leaching concentration of other metal ions did not exceed the standard. The results show that fly ash and arsenic slag can achieve co-stabilization. The specific stabilization results are shown in Table 1.

Embodiment 3

[0023] The properties of fly ash and arsenic slag are the same as in Example 1. According to the ratio of 1 kg of arsenic slag to 40 kg of fly ash, add the adjustment liquid to the tank reactor, control the mass ratio of the adjustment liquid to the mixed solid of fly ash and arsenic slag to 4:6, and mechanically stir at room temperature for 30 minutes until uniform . Measure the heavy metal leaching concentration such as Pb, Se, Cd, Ni in the mixture with the same method as embodiment 1 and be all lower than national hazardous waste identification standard, the heavy metal pollution of fly ash itself is controlled, and the As leaching concentration in the arsenic slag is reduced to 12.2mg / L, the leaching concentration decreased by 99.2% compared with untreated. In addition, the leaching concentration of other metal ions did not exceed the standard. The results show that fly ash and arsenic slag can achieve co-stabilization. The specific stabilization results are shown in T...

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Abstract

The invention discloses a method for jointly stabilizing fly ash and an arsenic-containing waste and relates to a treatment process for jointly stabilizing two hazardous wastes. The method comprises the following steps of: sequentially adding the fly ash and the arsenic-containing waste into a kettle type reactor according to a dry basis mass ratio of 1:(20-40); then adding a regulator solution being 10-40 percent of the weight of solid; and mechanically stirring and reacting for 5-30 minutes at normal temperature. After reacting, the volume of the mixed wastes is reduced by 10-30 percent, and the stabilization features of the product are greatly improved. Arsenic in the arsenic-containing waste is stabilized by the utilizing the physical and chemical characteristics of small grain diameter, large specific surface area, high Ca content, strong alkalinity, gel activity, and the like of the fly ash, and meanwhile, the migratory capacities of heavy metals such as Pb, Se, Cd, Ni, and the like in the fly ash are also obviously reduced and conform to an arrival standard of a hazardous waste landfill site. The method treats wastes by using wastes, greatly reduces the treatment cost, has simple equipment and considerable economic, social and environmental benefits and can be widely popularized and applied to the treatment of the fly ash and the arsenic-containing waste so as to achieve the purpose of stabilization.

Description

technical field [0001] The method for co-stabilizing fly ash and waste containing arsenic relates to a treatment process for co-stabilizing two kinds of hazardous waste, and belongs to the technical field of stabilization treatment of hazardous waste. Background technique [0002] As in the rock and soil layer is mainly mixed in gold, copper, lead, zinc, tin, nickel and cobalt in the form of sulfide. With the continuous development of mining and metallurgical industries, a large amount of waste containing arsenic is produced. For example, every 1 ton of gold mined in my country will produce 1732-20829 t of arsenic. In 2003, the annual output of arsenic slag in my country had reached 50,000 tons. In addition, more than 200,000 tons of arsenic residues were piled on the land, which brought great harm to the environment. In order to deal with this problem, a series of solidification and stabilization technologies have been developed in recent years, mainly by adding a certain...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 何品晶章骅姚倩邵立明
Owner TONGJI UNIV
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