Heavy metal hazardous waste stabilizing device

Abstract

The utility model discloses a heavy metal hazardous waste stabilizing device which comprises a mixing and stirring kettle, a bubbling bed reactor, a high-temperature separator, a low-temperature separator, a circulating hydrogen compressor, a rectifying tower and a hazardous waste collecting tank. The bubbling bed reactor is connected with a high-temperature separator, the high-temperature separator is respectively in pipe connection with a low-temperature separator and a rectifying tower, and the rectifying tower is in pipe connection with the hazardous waste collecting tank. The system effectively improves the stability of the heavy metal hazardous wastes, reduces the leaching dissociation of heavy metals, and ensures the long-term safe and stable landfill treatment of the heavy metal hazardous wastes.

Description

TECHNICAL FIELD

[0001] The utility model relates to heavy metal dangerous waste stabilization device belongs to a dangerous waste treatment technical field. BACKGROUND

[0002] In the field of coal gasification pyrolysis, combustible solid waste incineration, metal smelting refining, etc., a large amount of heavy metal-containing dangerous solid waste will be produced, including Cr, Hg, Mo, W, Ni, V, Pb, etc. The conventional disposal method of heavy metal dangerous waste is landfill disposal, but under the action of groundwater leaching, acidification, ion migration, etc., heavy metals will pollute the groundwater ecosystem in the area in the form of ions with groundwater runoff. Therefore, before landfill disposal, heavy metal dangerous waste needs to be stabilized to meet the ecological environmental protection requirements of long-term safe and stable disposal.

[0003] The current stabilization methods for dangerous waste include cement stabilization, asphalt stabilization, inorganic melting stabilization, plasma stabilization, etc. Due to the poor compatibility between heavy metals and asphalt solvents and the large density difference, the traditional asphalt solidification process has poor stabilization effect on heavy metal dangerous waste. SUMMARY

[0004] The utility model aims at providing heavy metal dangerous waste stabilization device, solves the problem of poor compatibility between heavy metals and asphalt solvents, large density difference, poor stabilization effect of traditional asphalt solidification process on heavy metal dangerous waste, and the problem of not safe and stable landfill treatment, heavy metals polluting the groundwater ecosystem in the area in the form of ions with groundwater runoff, etc.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme of:

[0006] The heavy metal dangerous waste stabilization device comprises a mixing and stirring kettle, a bubbling bed reactor, a high-temperature separator, a low-temperature separator, a circulating hydrogen compressor, a rectifying tower and a dangerous waste collection tank. The stirring mixture stirred and mixed by the mixing and stirring kettle is connected with the bubbling bed reactor pipe through the circulating hydrogen compressor with high-pressure hydrogen gas. The bubbling bed reactor is connected with the high-temperature separator. The high-temperature separator is respectively connected with the low-temperature separator and the rectifying tower pipe. The rectifying tower is connected with the dangerous waste collection tank pipe.

[0007] Preferably, the top of the low-temperature separator is connected with the circulating hydrogen compressor pipe. The hydrogen gas discharged from the low-temperature separator is mixed with the raw material high-pressure hydrogen gas for recycling. The separated tail gas is used as combustible gas.

[0008] Preferably, the stirring mixture stirred and mixed by the mixing and stirring kettle is heavy metal dangerous waste, inferior residual oil and composite catalyst.

[0009] Preferably, the high-temperature separator bottom effluent is separated by a rectifying column to obtain a liquid product and the liquid product is mixed with the low-temperature separator bottom effluent to obtain a by-product fuel oil.

[0010] Preferably, the inferior residual oil is one or more of ethylene cracking oil, deoiled pitch, atmospheric and vacuum residual oil, and catalytic cracking slurry oil.

[0011] Preferably, the composite catalyst is a combination of iron-based, cobalt-based, nickel-based, molybdenum-based hydrogenation catalyst and waste catalytic cracking slurry oil or waste catalytic cracking slurry oil catalyst.

[0012] The utility model has the following beneficial effects:

[0013] The heavy metal hazardous waste is stirred by the inferior residual oil and the composite catalyst, and high-pressure hydrogen is added to enter the bubbling bed reactor, so that the stability of the heavy metal hazardous waste can be effectively improved, and the heavy metal leaching free is reduced, and long-term safe and stable landfill disposal of the heavy metal hazardous waste is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a heavy metal hazardous waste treatment process schematic diagram of the utility model;

[0015] Figure: 1, heavy metal hazardous waste; 2, inferior residual oil; 3, composite catalyst; 4, high-pressure hydrogen; 5, mixing and stirring kettle; 6, bubbling bed reactor; 7, high-temperature separator; 8, low-temperature separator; 9, circulating hydrogen compressor; 10, rectifying column; 11, tail gas; 12, by-product fuel oil; 13, hazardous waste collection tank. DETAILED DESCRIPTION

[0016] The embodiments of the utility model will be further described in detail in combination with the drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0017] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0018] As Figure 1As shown, in the present embodiment, the heavy metal hazardous waste stabilizing device comprises a mixing stirred tank 5, a bubbling bed reactor 6, a high-temperature separator 7, a low-temperature separator 8, a circulating hydrogen compressor 9, a rectifying tower 10 and a hazardous waste collection tank 13. The stirring mixture in the mixing stirred tank 5 is connected to the bubbling bed reactor 6 through the circulating hydrogen compressor 9 and high-pressure hydrogen gas 4. The bubbling bed reactor 6 is the core reactor for stabilizing the heavy metal hazardous waste and simultaneously performs the hydro-upgrading of poor residual oil. The bubbling bed reactor 6 is connected to the high-temperature separator 7, which is connected to the low-temperature separator 8 and the rectifying tower 10, respectively. The rectifying tower 10 is connected to the hazardous waste collection tank 13. The bottom residue separated by the rectifying tower 10 is the stabilized heavy metal hazardous waste, which is stored in the hazardous waste collection tank 13 and is regularly sent to the hazardous waste landfill site for disposal.

[0019] The top of the low-temperature separator 8 is connected to the circulating hydrogen compressor 9. The hydrogen gas separated by the low-temperature separator 8 is mixed with the raw material high-pressure hydrogen gas 4 for recycling. The tail gas 11 separated by the low-temperature separator 8 is used as combustible gas.

[0020] The stirring mixture in the mixing stirred tank 5 is the heavy metal hazardous waste 1, poor residual oil 2 and composite catalyst 3.

[0021] The effluent at the bottom of the high-temperature separator 7 is separated by the rectifying tower 10 to obtain liquid products. The liquid products mixed with the liquid products at the bottom of the low-temperature separator 8 are used as by-product fuel oil 12, which can be used as the raw material for the fixed-bed hydrogenation process of the oil refining device.

[0022] The poor residual oil 2 is one or more of ethylene cracking oil, deoiled pitch, atmospheric and vacuum residual oil and catalytic cracking slurry oil.

[0023] The composite catalyst 3 is a combination of iron-based, cobalt-based, nickel-based and molybdenum-based hydrogenation catalysts and waste catalytic cracking slurry or waste catalytic cracking slurry catalyst.

[0024] Specifically, the heavy metal hazardous waste before and after stabilization is subjected to simulated leaching according to GB 5086.2-1997, and the heavy metal content in the leachate is analyzed.

[0025]

[0026] As shown in the above table, the heavy metal hazardous waste stabilized by the device can efficiently reduce the heavy metal content in the leachate, thereby improving the stability of the heavy metal hazardous waste landfill disposal.

[0027] The working principle of the utility model is: the resin and asphaltene contained in inferior residual oil 2 are important coke precursor. Under the action of certain temperature and cracking catalyst, coke precursor can be generated and preferentially enriched on heavy metal hazardous waste. Further catalytic condensation, coke precursor forms coke with more stable structure. These cokes can tightly wrap heavy metal hazardous waste inside and form dense coke protective shell. The coke protective shell has strong hydrophobic effect, even if subjected to precipitation and groundwater erosion during long-term landfill disposal of hazardous waste, still cannot produce free heavy metal ions, plays a role in stabilizing heavy metal hazardous waste. At the same time, by setting hydrogen environment in the device, under the action of hydrogenation catalyst of high-pressure hydrogen gas 4 added by circulating hydrogen compressor 9, other components of inferior residual oil 2 can be hydrogenated and lightened, and the viscosity, heteroatom content and the like of residual oil can be reduced. After reaction in the bubbling bed reactor 6, the product is separated by high-temperature separator 7, low-temperature separator 8 and rectifying column 10, and the by-product fuel oil can be used as raw material for oil refining fixed bed hydrogenation process.

[0028] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A heavy metal hazardous waste stabilisation apparatus characterised in that, It comprises a mixed stirring tank (5), a bubbling bed reactor (6), a high-temperature separator (7), a low-temperature separator (8), a circulating hydrogen compressor (9), a rectifying tower (10) and a hazardous waste collection tank (13), the mixed stirring tank (5) is connected with the bubbling bed reactor (6) through the circulating hydrogen compressor (9) by adding high-pressure hydrogen (4) into the stirring mixture, the bubbling bed reactor (6) is connected with the high-temperature separator (7), the high-temperature separator (7) is connected with the low-temperature separator (8) and the rectifying tower (10) respectively, and the rectifying tower (10) is connected with the hazardous waste collection tank (13).

2. The heavy metal hazardous waste stabilisation apparatus of claim 1, wherein, The top of the low-temperature separator (8) is connected with the circulating hydrogen compressor (9), the hydrogen separated from the low-temperature separator (8) is mixed with the raw material high-pressure hydrogen (4) for recycling, and the tail gas (11) separated from the low-temperature separator (8) is used as combustible gas.

3. The heavy metal hazardous waste stabilisation plant of claim 1, wherein, The stirring mixture in the mixed stirring tank (5) is heavy metal hazardous waste (1), poor residual oil (2) and composite catalyst (3).

4. The heavy metal hazardous waste stabilisation plant of claim 1, wherein, The effluent at the bottom of the high-temperature separator (7) is separated by the rectifying tower (10) to obtain liquid products, and the liquid products at the bottom of the low-temperature separator (8) are mixed to obtain by-product fuel oil (12).

5. The heavy metal hazardous waste stabilisation plant of claim 3, wherein, The poor residual oil (2) is one or more of ethylene cracking oil, deoiled asphalt, atmospheric and vacuum residual oil and catalytic cracking slurry.

6. The heavy metal hazardous waste stabilisation plant of claim 3, wherein, The composite catalyst (3) is a combination of iron-based, cobalt-based, nickel-based and molybdenum-based hydrogenation catalysts and waste catalytic cracking slurry or waste catalytic cracking slurry catalysts.

Images