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Lignite modification method and system for treating heavy metal wastewater

A technology for heavy metals and lignite, applied in the directions of alkali metal compounds, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of low efficiency of heavy metal wastewater treatment, poor effect of lignite modification and upgrading, and loss of lignite upgrading process, etc. Achieving the effect of low price, excellent performance and simple operation

Active Publication Date: 2021-08-10
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above analysis, the present invention aims to provide a lignite modification method and system for treating heavy metal wastewater, in order to solve the low treatment efficiency and poor effect of the existing lignite treatment of heavy metal wastewater and the loss of organic matter in the coal matrix by the lignite upgrading process, One or more of the problems that lead to poor modification and upgrading effect of lignite and low resource utilization

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  • Lignite modification method and system for treating heavy metal wastewater
  • Lignite modification method and system for treating heavy metal wastewater
  • Lignite modification method and system for treating heavy metal wastewater

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Embodiment 1

[0056] Another specific embodiment of the present invention discloses a lignite modification method for treating heavy metal wastewater. In the method, the lignite modification stage includes an adsorption modification stage and a heating upgrading modification stage. In the adsorption modification stage, lignite particles By absorbing heavy metal ions, the surface of lignite is initially modified. In the stage of heating and upgrading, the moisture in lignite is removed, and the lignite is modified again. Modification method comprises the steps:

[0057] Step 1: Put lignite particles and heavy metal wastewater into the first reaction device 1, stir and mix, lignite particles adsorb heavy metal ions, after the first reaction time, complete lignite adsorption modification, and obtain adsorbed solid phase and adsorbed wastewater ;

[0058] Step 2: Put the adsorbed solid phase and part of the adsorbed waste water in the first reaction device 1 into the second reaction device 2, ...

Embodiment 2

[0081] A specific embodiment of the present invention discloses a lignite modification system for processing heavy metal wastewater, which can be applied to the lignite modification method for processing heavy metal wastewater in Example 1, such as Figure 2 to Figure 3 As shown, the lignite modification system for heavy metal wastewater treatment includes:

[0082] The first reaction device 1, the first reaction device 1 has a first cylinder 1-1, in order to accommodate lignite particles and heavy metal waste water; the top of the first cylinder 1-1 is provided with a first feed port 1-2 and waste water Inlet 1-3, the lower part of the first cylinder 1-1 is provided with a first discharge port 1-6; the first cylinder 1-1 is provided with a first agitator 1-4 to prepare for lignite particles and heavy metals The wastewater is stirred to realize the adsorption modification of lignite;

[0083] The second reaction device 2, the second reaction device 2 has a second cylinder 2-1...

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Abstract

The invention relates to a lignite modification method and system for treating heavy metal wastewater, and the modification method comprises the following steps: loading lignite particles and heavy metal wastewater into a first reaction device, uniformly stirring and mixing, enabling the lignite particles to adsorb heavy metal ions, completing lignite adsorption modification after a first reaction time, and obtaining an adsorbed solid phase and adsorbed wastewater; and filling the adsorbed solid phase in the first reaction device and a part of the adsorbed wastewater into a second reaction device, and heating for a second reaction time under a closed condition to obtain the hydrothermal dehydration modified lignite with heavy metal removed. The heavy metal wastewater is subjected to primary purification treatment by utilizing the adsorption performance of the lignite, the lignite adsorbing heavy metals is subjected to hydrothermal treatment upgrading by using a hydrothermal upgrading means, the fixed carbon content and the calorific value are improved while harmful elements in the lignite are removed, and the continuous treatment process saves the cost and improves the resource utilization rate.

Description

technical field [0001] This patent belongs to the technical field of heavy metal wastewater treatment and lignite modification, and specifically relates to a lignite modification method and system for treating heavy metal wastewater. Background technique [0002] The rapid development of the heavy metal industry has made the heavy metal pollution in the environment more and more serious. If untreated or substandard heavy metal wastewater is discharged into the environment, the water and soil will be polluted to varying degrees. Heavy metals are toxic, difficult to degrade and persistent, and can be enriched in aquatic products and crops, causing serious harm to human health. At present, the treatment methods for wastewater containing heavy metal ions include: precipitation method, biological method, adsorption method, ion exchange method, membrane separation method, biological treatment technology, etc. Among them, the adsorption method has received extensive attention sin...

Claims

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Application Information

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IPC IPC(8): C10L9/02C10L9/08C02F1/28B01J20/24B01J20/28B01J20/30C02F101/20
CPCC02F1/286B01J20/24B01J20/3078B01J20/28016C10L9/08C10L9/02C02F2101/20
Inventor 万克记范津津薛舒文王国强苗真勇贺琼琼许恩乐
Owner CHINA UNIV OF MINING & TECH