Resource treatment process for inorganic salt hazardous wastes

A treatment process and inorganic salt technology, applied in the field of inorganic salt hazardous waste resource treatment process, can solve the problems of adsorbent loss, difficult treatment, high adsorption cost, etc., increase specific surface area, improve adsorption effect, and solve environmental protection problems Effect

Active Publication Date: 2020-02-07

内蒙古中泰汇金环保科技有限公司

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AI-Extracted Technical Summary

Problems solved by technology

However, because the incinerators equipped by hazardous waste incineration and disposal enterprises did not consider the problems of inorganic salt melting, equipment corrosion, and pipeline blockage that may be caused by waste slag salt treatment at the beginning of the design, the treatment is difficult, resulting in a large amount of slag salt in the area. It exists in the enterprise factory, which seriously restricts ...

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Abstract

The invention relates to the field of environmental protection treatment, in particular to a resource treatment process for inorganic salt hazardous wastes; and the main steps comprise feed treatment,high-temperature oxidation, waste salt refining treatment and evaporative crystallization. According to the process, the inorganic salt hazardous wastes are subjected to resource treatment through aprocess of negative pressure drying, a multilayer suspended oxidation furnace and a high-temperature rotary oxidation furnace, and compared with a traditional industrial slag salt high-temperature heat treatment process, the process can efficiently remove organic matters and effectively solve the problems of inorganic salt melting agglomeration, high-temperature refractory material corrosion and pipeline blockage caused by cooling in a pipeline during inorganic salt refining which may exist at high temperature; by using a carbamido modified bagasse adsorbent, trace organic matters remaining ina salt solution can be effectively removed, and the process of negative pressure drying and high-temperature liquefaction oxidation furnace is adopted, so that the high-temperature decomposition rateof the organic matters in the slag salt can be guaranteed and the problem of melting agglomeration can be solved.

Application Domain

Other chemical processesTransportation and packaging +3

Technology Topic

SlagProcess engineering +10

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Examples

Experimental program(4)
Comparison scheme(6)

Example Embodiment

[0029] Example 1

[0030] A resource treatment process for inorganic salt hazardous waste, and its technical scheme includes the following steps:

[0031] Step 1. Feeding treatment. Firstly, the slag salt is transported to the pretreatment plant, mixed in the mixing tank, and then crushed by the crusher and transported to the feed hopper, and then sent to the negative pressure by the closed screw conveyor The dryer is dried at 150℃ to control the moisture content of the slag salt at 0.1%;

[0032] Step two, high temperature oxidation, the dried slag salt enters the oxidation furnace, and is calcined at a high temperature of 450°C for 60 seconds, and then is further oxidized and calcined in a rotary oxidation furnace;

[0033] Step three, waste salt refining treatment, the high-temperature oxidized coarse salt is sent to the dissolving kettle through a screw conveyor, water is added to the dissolving kettle, the coarse salt is prepared into 310g/L saturated brine with a temperature of 50℃, and the solution Add 4.5g/L of hydrogen peroxide and 9g/L of barium chloride to the kettle of mixed salt, stir and mix for 20 minutes, add 0.15g/L of sodium sulfide and 3g/L of flocculant, continue to stir and mix for 10 minutes, and then follow 10g Add a urea-based modified bagasse adsorbent in the amount of /L, mix and stir for 30 minutes, then filter with an ultrafiltration system to obtain clarified nearly saturated mixed brine, which is pumped into the mixed brine tank for temporary storage;

[0034] Step 4: Evaporation and crystallization, the clarified saturated brine is passed through the pipeline into the evaporation and crystallization equipment for concentration and crystallization to obtain refined and recovered inorganic salts.

[0035] The urea-based modified bagasse adsorbent is prepared according to the following method:

[0036] According to the mass parts, add 100 parts of bagasse powder, 12 parts of epichlorohydrin and 130 parts of dimethylformamide into the reactor, control the temperature at 95°C, stir and react for 70 minutes, and then add 5 parts of two Ethylene triamine dihydrogenated tallow amide and 0.06 parts of 4-amino-6-bromoquinoline were added to the reaction kettle, and the stirring was continued for 40-180 minutes; then 7 parts of ureidoacetic acid and 0.4 parts of mercaptoguanidine hydrochloride were added, Add 0.06 parts of 2,5-dichloro-3-thiophene carboxylic acid, 0.3 parts of bis(trichloroacetaldehyde) urea, and 04 parts of sodium bisulfate to the reaction kettle, stir well and seal, and react at 102°C for 3 hours. After the reaction is completed, it is filtered, washed with water, dried, and ground to obtain the urea-based modified bagasse adsorbent.

[0037] The unloading, crushing, conveying, feeding and other links in the feeding treatment are all in a negative pressure state, and are completely sealed to minimize the leakage of exhaust gas.

[0038] The flocculant is polyaluminum iron chloride.

[0039] The oxidation furnace is a multi-layer suspension oxidation furnace.

[0040] Neither lead ion nor cadmium ion was detected in the sample in this experiment, and the residual rate of organic matter in the sample was 0. The urea-based modified bagasse adsorbent was desorbed to remove metal ions, and it failed after repeated use for 30 times.

Example Embodiment

[0041] Example 2

[0042] A resource treatment process for inorganic salt hazardous waste, and its technical scheme includes the following steps:

[0043] Step 1. Feeding treatment. Firstly, the slag salt is transported to the pretreatment plant, mixed in the mixing tank, and then crushed by the crusher and transported to the feed hopper, and then sent to the negative pressure by the closed screw conveyor The dryer is dried at 180°C, and the moisture content of the slag salt is controlled at 0.5%.

[0044] Step two, high temperature oxidation, the dried slag salt enters the oxidation furnace, and is calcined at a high temperature of 480°C for 90 s, and then is further oxidized and calcined in a rotary oxidation furnace;

[0045] Step three, waste salt refining treatment, the high-temperature oxidized coarse salt is sent to the dissolving kettle through a screw conveyor, water is added to the dissolving kettle, and the coarse salt is made into 450g/L saturated brine with a temperature of 505°C and dissolving Add 6.5g/L of hydrogen peroxide and 14g/L of barium chloride to the kettle of mixed salt, stir and mix for 25 minutes, add 0.35g/L of sodium sulfide and 5g/L of flocculant, continue to stir and mix for 20 minutes, and then follow 20g Add a urea-based modified bagasse adsorbent in the amount of /L, mix and stir for 45 minutes, then filter with an ultrafiltration system to obtain clarified nearly saturated mixed brine, which is pumped into the mixed brine tank for temporary storage;

[0046] Step 4: Evaporation and crystallization, the clarified saturated brine is passed through the pipeline into the evaporation and crystallization equipment for concentration and crystallization to obtain refined and recovered inorganic salts.

[0047] The urea-based modified bagasse adsorbent is prepared according to the following method:

[0048] According to the mass parts, add 100 parts of bagasse powder, 8 parts of epichlorohydrin and 100 parts of dimethylformamide into the reactor, control the temperature at 90°C, stir and react for 60 minutes, and then add 2.4 parts of two Ethylene triamine dihydrogenated tallow amide, 0.01 part of 4-amino-6-bromoquinoline was added to the reaction kettle, and the reaction was continued to stir for 40 minutes; then 5.2 parts of allophanic acetic acid and 0.1 part of mercaptoguanidine hydrochloride, 0.01 part Add 2,5-dichloro-3-thiophenecarboxylic acid, 0.1 part of bis(trichloroacetaldehyde)urea, and 0.05-1 part of sodium bisulfate into the reaction kettle, stir well and seal, and react at 100℃ for 1h. After the reaction is completed, it is filtered, washed with water, dried, and ground to obtain the urea-based modified bagasse adsorbent.

[0049] The unloading, crushing, conveying, feeding and other links in the feeding treatment are all in a negative pressure state, and are completely sealed to minimize the leakage of exhaust gas.

[0050] The flocculant is polyacrylamide.

[0051] The oxidation furnace is a multi-layer suspension oxidation furnace.

[0052] Neither lead ions nor cadmium ions were detected in the samples in this experiment, and the residual rate of organic matter in the samples was 0. The urea-based modified bagasse adsorbent was desorbed to remove metal ions, and it failed 27 times after repeated use.

Example Embodiment

[0053] Example 3

[0054] A resource treatment process for inorganic salt hazardous waste, and its technical scheme includes the following steps:

[0055] Step 1. Feeding treatment. Firstly, the slag salt is transported to the pretreatment plant, mixed in the mixing tank, and then crushed by the crusher and transported to the feed hopper, and then sent to the negative pressure by the closed screw conveyor The dryer is dried at 250°C to control the moisture content of the slag salt at 1%;

[0056] Step 2: High-temperature oxidation, the dried slag salt enters the oxidation furnace, and is calcined at a high temperature of 500°C for 120s, and then undergoes further oxidation and calcining treatment in a rotary oxidation furnace;

[0057] Step three, waste salt refining treatment, the high-temperature oxidized coarse salt is sent to the dissolving kettle through a screw conveyor, water is added to the dissolving kettle, the coarse salt is prepared into saturated brine at 650g/L and the temperature is 60℃, Add 8.5g/L of hydrogen peroxide and 17g/L of barium chloride to the kettle of mixed salt, stir and mix for 30 minutes, add 0.55g/L of sodium sulfide and 7g/L of flocculant, continue to mix for 30 minutes, and then follow 30g Add a urea-based modified bagasse adsorbent in the amount of /L, mix and stir for 60 minutes, then filter with an ultrafiltration system to obtain clarified nearly saturated mixed brine, which is pumped into the mixed brine tank for temporary storage;

[0058] Step 4: Evaporation and crystallization, the clarified saturated brine is passed through the pipeline into the evaporation and crystallization equipment for concentration and crystallization to obtain refined and recovered inorganic salts.

[0059] The urea-based modified bagasse adsorbent is prepared according to the following method:

[0060] According to the mass parts, add 100 parts of bagasse powder, 15 parts of epichlorohydrin and 200 parts of dimethylformamide into the reactor, control the temperature at 100°C, stir and react for 120min, and then add 7.3 parts of two Ethylene triamine dihydrogenated tallow amide and 1 part 4-amino-6-bromoquinoline were added to the reaction kettle, and the reaction was continued to stir for 180 minutes; then 9.8 parts of ureidoacetic acid and 1 part of mercaptoguanidine hydrochloride, 1 part Add 2,5-dichloro-3-thiophenecarboxylic acid, 1 part of bis(trichloroacetaldehyde)urea, and 0.05-1 part of sodium bisulfate into the reaction kettle, stir well and seal, and react at 110℃ for 5h. After the reaction is completed, it is filtered, washed with water, dried, and ground to obtain the urea-based modified bagasse adsorbent.

[0061] The unloading, crushing, conveying, feeding and other links in the feeding treatment are all in a negative pressure state, and are completely sealed to minimize the leakage of exhaust gas.

[0062] The flocculant is polyaluminum sulfate.

[0063] The oxidation furnace is a multi-layer suspension oxidation furnace.

[0064] Neither lead ions nor cadmium ions were detected in the sample in this experiment, and the residual rate of organic matter in the sample was 0. The urea-based modified bagasse adsorbent after use was desorbed to remove metal ions, and it failed 35 times after repeated use.

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Classification and recommendation of technical efficacy words

Improve the adsorption effect
Solve environmental problems

Nitrogen modified nanometer titanium dioxide and Phanerochete chrysosporium composite adsorbent, and its preparation method and application

InactiveCN102423691AImprove the adsorption effectEasy to recycleOther chemical processesWater/sewage treatment by sorptionChrysosporiumPhenols

Owner:HUNAN UNIV

Resource treatment process for inorganic salt hazardous wastes

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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