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Method for removing heavy metals in fly ash and purifying tail liquid containing heavy metals

A heavy metal and fly ash technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve problems such as complex systems that are difficult to effectively deal with various trace heavy metal elements and various ions , to achieve the effect of high industrial feasibility and simple process

Active Publication Date: 2021-12-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the removal of heavy metal ions in the liquid phase, the current traditional methods include chemical precipitation, ion exchange, electrolysis, adsorption, etc., but these traditional methods have certain shortcomings and deficiencies, and it is difficult to effectively treat various trace heavy metal elements. and a complex system of multiple ions

Method used

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  • Method for removing heavy metals in fly ash and purifying tail liquid containing heavy metals
  • Method for removing heavy metals in fly ash and purifying tail liquid containing heavy metals
  • Method for removing heavy metals in fly ash and purifying tail liquid containing heavy metals

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Embodiment 1

[0042] This embodiment provides a method for removing heavy metals in fly ash and purifying tail liquid containing heavy metals, said method comprising the following steps:

[0043] The fly ash used in this embodiment is a power plant fly ash in Hulunbeier, Inner Mongolia, and the heavy metal content is as shown in Table 1;

[0044] (1) fly ash is mixed with the sulfuric acid solution that concentration is 0.5mol / L and react under stirring, and the volume mass ratio of described sulfuric acid solution and described fly ash is 4:1L / kg, and the time of reaction is 20°C for 60 minutes, solid-liquid separation after reaction to obtain leaching liquid and leaching residue;

[0045] (2) pulp washing the leaching slag obtained in step (1), the volume-to-mass ratio of the slurry water to the leaching slag is 8:1L / kg, to obtain the pulp washing liquid and the fly ash for removing heavy metals;

[0046] (3) the leaching liquid that merge step (1) obtains and the slurry washing liquid t...

Embodiment 2

[0049] This embodiment provides a method for removing heavy metals in fly ash and purifying tail liquid containing heavy metals, said method comprising the following steps:

[0050] The fly ash used in this embodiment is a power plant fly ash in Wulanchabu, Inner Mongolia, and the heavy metal content is as shown in Table 1;

[0051] (1) fly ash is mixed with the sulfuric acid solution that concentration is 0.2mol / L and react under stirring, and the volume mass ratio of described sulfuric acid solution and described fly ash is 3:1L / kg, and the time of reaction is 40°C for 90 minutes, solid-liquid separation after reaction to obtain leaching liquid and leaching residue;

[0052] (2) pulp washing the leaching slag obtained in step (1), the volume to mass ratio of the slurry water to the leaching slag is 4:1L / kg, to obtain the pulp washing liquid and the fly ash for removing heavy metals;

[0053] (3) the leaching liquid that merge step (1) obtains and the slurry washing liquid t...

Embodiment 3

[0055] This embodiment provides a method for removing heavy metals in fly ash and purifying tail liquid containing heavy metals, said method comprising the following steps:

[0056] The fly ash used in this embodiment is a power plant fly ash in Changzhi, Shanxi, and the heavy metal content is as shown in Table 1;

[0057] (1) fly ash is mixed with the sulfuric acid solution that concentration is 2.0mol / L and react under stirring, and the volume mass ratio of described sulfuric acid solution and described fly ash is 2:1L / kg, and the time of reaction is 60°C, the time is 30min, after the reaction, the solid-liquid separation is obtained to obtain the leaching liquid and leaching residue;

[0058] (2) pulp washing is carried out to the leaching slag obtained in step (1), the volume mass ratio of the slurry water to the leaching slag is 6:1L / kg, to obtain the pulp washing liquid and the fly ash for removing heavy metals;

[0059] (3) the leaching liquid that merge step (1) obtai...

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Abstract

The invention provides a method for removing heavy metals in fly ash and purifying tail liquid containing the heavy metals. The method comprises the following steps that (1), the fly ash is mixed with an acid solution to be reacted, and solid-liquid separation is carried out after the reaction to obtain leaching liquid and leaching residues; (2), the leaching residues obtained in the step (1) are subjected to pulp washing, and pulp washing liquid and fly ash with the heavy metals removed are obtained; and (3), the leaching liquid obtained in the step (1) and the pulp washing liquid obtained in the step (2) are combined to obtain the tail liquid containing the heavy metals, an aluminum source is added into the tail liquid to adjust the molar concentration ratio of Al<3+> to SO4<2-> to Si<4+>, then a calcium source is added to adjust the pH value of the tail liquid, and solid-liquid separation is carried out after reaction to complete purification of the tail liquid containing the heavy metals. The method has the advantages of high removal rate of the heavy metals, simple process and low cost, and can effectively improve the utilization rate of the fly ash.

Description

technical field [0001] The invention belongs to the field of heavy metal treatment in solid waste and waste liquid, and relates to a method for removing heavy metal in fly ash and purifying tail liquid containing heavy metal. Background technique [0002] Fly ash is the fly ash produced after high-temperature combustion of coal, and has become one of the largest industrial solid wastes in China. Because fly ash contains a certain amount of heavy metal elements, such as arsenic, mercury, lead, chromium, etc., and the occurrence state of heavy metal elements is relatively complex, there is the possibility of migration in the natural environment, which restricts the comprehensive utilization of fly ash Pathway expansion. Therefore, it is urgent to develop efficient removal methods for heavy metal elements in fly ash. [0003] At present, there are few researches on the removal technology of heavy metal elements in fly ash. CN108237137A discloses a fly ash mercury removal dev...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/32C22B30/04C22B43/00C22B15/00C22B19/30C22B13/00C22B17/00C22B23/00C22B19/20C22B21/00C22B26/20C22B26/22C02F1/62C02F101/20
CPCC22B7/007C22B34/32C22B13/045C22B30/04C22B17/04C22B43/00C22B23/043C22B15/0071C22B19/22C22B19/30C22B21/0023C22B26/20C22B26/22C02F1/62C02F2101/20Y02P10/20
Inventor 马淑花王晓辉刘福立
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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