Comprehensive utilization method of organic hazardous waste salt slag

A waste salt residue, organic technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of easily polluting the landfill environment, high landfill costs, and achieve the effect of controllable pollution

Pending Publication Date: 2020-06-16
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current main treatment and disposal method is landfill, but because the salt residue is hazardous waste, the cost of landfill is extremely high, and it is also easy to pollute the environment around the landfill

Method used

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  • Comprehensive utilization method of organic hazardous waste salt slag
  • Comprehensive utilization method of organic hazardous waste salt slag
  • Comprehensive utilization method of organic hazardous waste salt slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take an appropriate amount of organic hazardous waste salt slag and dry it at 100°C for 180 minutes. The dried organic hazardous waste salt slag is pre-carbonized in a tube furnace at 400°C for 150 minutes. The treated residue was ground and passed through a 100-mesh sieve, and then redissolved at a solid-to-liquid ratio of 0.01. The filtrate was collected by filtration, and the filtrate was dried at 100°C for 180 minutes to obtain net salt. Add activator (KOH solution) with a mass concentration of 20% to the filter residue with a ratio of activator to carbonization product mass ratio of 2, let it stand at room temperature for 4h, filter, and dry the filter cake, then put it in a muffle furnace at 400 ° C Calcination and activation for 30 minutes to obtain activated carbon. See Table 1-1, 1-2, 1-3 for related indicators.

[0025] The net salt detection index in the table 1-1 embodiment 1

[0026]

[0027] The heavy metal leaching value in the table 1-2 embodiment 1...

Embodiment 2

[0032] Take an appropriate amount of organic hazardous waste salt slag and dry it at 105°C for 150 minutes, and the dried organic hazardous waste salt slag is pre-carbonized in a tube furnace at 450°C for 120 minutes. The treated residue was ground and passed through a 100-mesh sieve, and then redissolved at a solid-to-liquid ratio of 0.03. The filtrate was collected by filtration, and the filtrate was dried at 105°C for 150 minutes to obtain net salt. Add activator (KOH solution) with a mass concentration of 30% to the filter residue with a ratio of activator to carbonization product mass ratio of 3, let it stand at room temperature for 6 hours, filter, and dry the filter cake, then put it in a muffle furnace at 450 ° C Calcination and activation for 60 minutes to obtain activated carbon. See Table 2-1, 2-2, 2-3 for related indicators.

[0033] The net salt detection index in the table 2-1 embodiment 2

[0034]

[0035]

[0036] The heavy metal leaching value in the t...

Embodiment 3

[0041] Take an appropriate amount of organic hazardous waste salt slag and dry it at 110°C for 120 minutes, and the dried organic hazardous waste salt slag is pre-carbonized in a tube furnace at 500°C for 90 minutes. The treated residue was ground and passed through a 100-mesh sieve, and then redissolved at a solid-to-liquid ratio of 0.05. The filtrate was collected by filtration, and the filtrate was dried at 110°C for 120 minutes to obtain net salt. Then add the activator (KOH solution) that mass concentration is 40% to filter residue with the ratio of activator to carbonization product mass ratio is 4, leave standstill 8h at normal temperature, filter, filter cake is dried, behind the 500 in the muffle furnace ℃ calcination and activation for 90 minutes to obtain activated carbon. See Table 3-1, 3-2, 3-3 for related indicators.

[0042] The net salt detection index in the table 3-1 embodiment 3

[0043]

[0044] The heavy metal leaching value in the table 3-2 embodimen...

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Abstract

The invention relates to a comprehensive utilization method of organic hazardous waste salt slag. The comprehensive utilization method comprises the following specific steps: carbonizing dried organichazardous waste salt slag in a tubular furnace in a nitrogen atmosphere; grinding the carbonization product, adding water to dissolve the carbonization product, and performing filtering to obtain a carbonization product and a filtrate; adding an activating agent and water into the carbonization product, uniformly mixing, standing, filtering, drying a filter cake obtained by filtering for later use, collecting and uniformly treating the obtained filtrate, and activating the dried filter cake in a tubular furnace to obtain activated carbon; and evaporating the obtained filtrate to obtain pure salt. Industrial waste can be treated according to local conditions, water and soil resources are effectively protected, and environmental pollution is controlled. The method has important environmental, economic and social benefits.

Description

technical field [0001] The invention relates to a comprehensive utilization of solid waste, in particular to a comprehensive utilization method of organic hazardous waste salt slag. Background technique [0002] As the world's largest textile printing and dyeing country, my country has a huge demand for dyes. The consumption of dyestuffs will generate a large amount of wastewater, which has become one of the main sources of water pollution and seriously threatens the ecological environment. Most of the printing and dyeing wastewater has a high salinity before treatment, so salting out will be carried out before the next step of treatment. This process easily produces a large amount of waste salt residue. This type of waste salt slag contains a large amount of organic matter, and its inorganic salt composition is mainly 93% to 97% NaCl, and a small amount of NaSO 4 etc., its organic components are relatively complex, including oil agents, fiber magazines, benzene, amines an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324C01D3/04
CPCC01B32/348C01B32/324C01D3/04
Inventor 刘志英徐炎华程兴郑虞琪梁川
Owner NANJING UNIV OF TECH
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