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Medical waste salt harmless method based on thermochemical treatment

A technology of thermochemical treatment and purification treatment, applied in waste heat treatment, combustion methods, incinerators, etc., can solve the problem of large landfill cost and achieve the effect of reducing process cost

Active Publication Date: 2021-02-09
NJTECH ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the requirements of the latest regulations, landfill disposal of waste salt hazardous waste has been restricted, the landfill requirements tend to be stricter, and the cost of landfill is huge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The pharmaceutical waste salt is sent to a rotary dryer and dried at an ambient temperature of 105°C for 180min. The dried waste salt is fed into a hammer crusher for crushing to obtain waste salt particles with uniform particles and a particle size not greater than 5mm.

[0025] Feed the dried and crushed waste salt particles into the thermochemical reactor, control the operating temperature of the reactor at 600°C, and keep the residence time at 180 minutes. At the same time, air is introduced according to the excess coefficient of 2.0 to fully decompose the organic matter in the waste salt.

[0026] The thermochemically treated salt is sent to the cooler for cooling to obtain clean salt, and the cooling medium is air at normal temperature.

[0027] As for the flue gas produced during the thermochemical treatment, it can be sent to the oxidant preheater (heat exchanger) to preheat the air to the thermochemical reactor.

[0028] After that, the flue gas after recovery...

Embodiment 2

[0033] The waste medicine salt is sent to a rotary dryer and dried at a temperature of 110°C for 90 minutes. Send the dried waste salt to a jaw crusher for crushing to obtain uniform waste salt particles with a particle size not greater than 5mm.

[0034] Feed the dried and crushed waste salt into the thermochemical reactor, control the operating temperature of the reactor at 800°C, and hold the residence time for 60 minutes to decompose the organic matter in the waste salt.

[0035] The thermochemically treated salt is sent to the cooler for cooling to obtain cooled net salt, and the cooling medium is air at normal temperature or cooling water.

[0036] The flue gas generated during the thermochemical treatment process can be sent to the waste heat recovery system to recover excess heat. The recovered heat is transferred to other processes through the heat exchanger. It includes a heat exchanger for preheating the oxidant, and the high-temperature flue gas is sent into the ...

Embodiment 3

[0042] The waste medicine salt is sent to a rotary dryer and dried at a temperature of 120°C for 30 minutes. The dried waste salt is sent to a blade grinder for crushing treatment to obtain uniform waste salt particles with a particle size not greater than 5mm.

[0043] Feed the dried and crushed waste salt into the thermochemical reactor, control the operating temperature of the reactor to 1100°C, and stay for 30 minutes to decompose the organic matter in the waste salt.

[0044] Send the thermochemically treated salt into the cooler to lower the temperature to obtain cooled net salt. The cooling medium of the cooler can be normal temperature air or cooling water.

[0045] The flue gas generated during the thermochemical treatment process can be sent to the waste heat recovery system to recover excess heat. The recovered heat is transferred to other processes through the heat exchanger. It includes a heat exchanger for preheating the oxidant, sending high-temperature flue ...

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Abstract

The invention discloses a medical waste salt harmless treatment method based on thermochemical treatment. The medical waste salt harmless treatment method based on thermochemical treatment comprises the following steps of: carrying out drying and crushing pretreatment on waste salt; carrying out thermochemical treatment on the pretreated waste salt, wherein the operation temperature is 600-1100 DEG C, the treatment time is 30-180 min, and an oxidizing agent is introduced according to the excess coefficient 1.2-2.0 in the treatment process; feeding the waste salt subjected to thermochemical treatment into a cooler to obtain cooled pure salt; feeding flue gas generated by thermochemical treatment into a waste heat recovery system to recover surplus heat, and through a heat exchanger, preheating an oxidizing agent introduced into a thermochemical reactor; and before the flue gas is discharged, purifying the flue gas subjected to waste heat recovery. According to the medical waste salt harmless treatment method based on thermochemical treatment, organic matter difficult to degrade in the medical waste salt can be fully converted into harmless matter, so that the problem that the medical waste salt harms the environment is solved from the source; and waste heat generated in thermochemical treatment is recycled, so that the process cost can be effectively reduced, environmental protection and energy saving are achieved, and the method is suitable for being popularized and applied.

Description

technical field [0001] The invention belongs to the technical fields of chemical engineering and environmental protection, and specifically relates to a method for harmless treatment of medical waste salt based on thermochemical treatment. Background technique [0002] With the development of the pharmaceutical industry, a large amount of industrial waste salt from the pharmaceutical industry cannot be treated in a timely and effective manner. Medical waste salt has a complex composition and contains a large amount of harmful and difficult-to-degrade organic matter, which will be required to be disposed of as hazardous waste through landfill. However, according to the requirements of the latest regulations, the landfill disposal of waste salt hazardous waste has been restricted, the landfill requirements tend to be stricter, and the cost of landfill is huge. Therefore, encouraging the regeneration of waste salt hazardous waste and minimizing the construction of hazardous wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G5/033F23G5/04F23G5/46F23L15/00F23J15/02F23J15/06F27D17/00
CPCF23G5/033F23G5/04F23G5/46F23L15/00F23J15/025F23J15/06F27D17/004F27D17/008Y02E20/34Y02P10/25
Inventor 李绚天孙进徐学骁吴佩佳夏银徐炎华
Owner NJTECH ENVIRONMENT TECH CO LTD
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