CN109500062B

CN109500062B - Preparation method of waste tire resource material improved by excess sludge

Info

Publication number: CN109500062B
Application number: CN201811527217.2A
Authority: CN
Inventors: 陈英文; 陈秀鹃; 范梦婕; 徐源; 徐海涛; 祝社民
Original assignee: Nanjing Jiekefeng Environmental Protection Technology Equipment Research Institute Co ltd; Nanjing Tech University
Current assignee: Nanjing Jiekefeng Environmental Protection Technology Equipment Research Institute Co ltd; Nanjing Tech University
Priority date: 2018-12-13
Filing date: 2018-12-13
Publication date: 2021-04-20
Anticipated expiration: 2038-12-13
Also published as: CN109500062A

Abstract

The invention relates to a method for preparing waste tire recycling material improved by excess sludge. The carbon removes ash, S and other substances by cleaning; ultrasonically mixes excess sludge with pyrolytic carbon; adds binder to the mixture and continues ultrasonic mixing; removes the pyrolytic carbon with excess sludge from the mixture Anaerobic high-temperature pyrolysis is carried out to finally form waste tire recycling materials improved by excess sludge. The waste tire resource material improved by the excess sludge prepared by the invention has the characteristics of excellent biocompatibility, strong hydrophilicity, etc., can be used as a biological film carrier, adsorption material, electrode material, etc., and has very high performance in industrial production. great application value.

Description

Preparation method of waste tire resource material improved by excess sludge

Technical Field

The invention relates to a preparation method of a waste tire resource material improved by excess sludge, belonging to the field of new materials.

Background

In recent years, the demand for various types of motor vehicles and transportation has increased dramatically, with a concomitant dramatic increase in the number of scrap tires. Most of the scrap tires are deposited in landfills, which has become one of the most potentially hazardous waste disposal problems. At present, the recycling of waste tires by pyrolysis technology has become a research hotspot. The pyrolytic carbon is a main product of waste tire pyrolysis, has high carbon content, but because of the limitation of raw materials, the pyrolytic carbon contains a large amount of ash, inorganic impurities and the like, reduces the surface polarity of the pyrolytic carbon, influences the biocompatibility of the pyrolytic carbon, and limits the application of the pyrolytic carbon in the fields of agriculture, biology, environment and the like. Therefore, how to improve the performance of the pyrolytic carbon and improve the application value of the pyrolytic carbon becomes an important link for recycling and comprehensively utilizing waste tire resources.

In addition to the waste disposal problem caused by waste tires, the rational disposal of excess sludge is an environmental problem that is urgently needed to be solved. At present, sludge treatment mainly depends on landfill, incineration and composting, and with the enhancement of environmental awareness, the traditional methods of landfill, land utilization, incineration and the like of sludge are increasingly limited, and if the sludge cannot be properly treated, more serious secondary pollution can be caused. Therefore, finding new sludge resource utilization technology is receiving more and more attention. The excess sludge contains a large amount of nutrient elements such as microorganisms, biological remains, organic matters, N, P and the like, so that the excess sludge is subjected to anaerobic carbonization to form the biomass charcoal, the treatment problem of the biomass charcoal can be effectively solved, the biomass charcoal is recycled, and secondary utilization is realized. The biomass charcoal with good biocompatibility is used as a multifunctional material and has wide application in the fields of agriculture, biology and environment.

Disclosure of Invention

The invention aims to provide a preparation method of a waste tire resource material with improved excess sludge for improving the defects of the prior art, which organically combines waste tire pyrolytic carbon and excess sludge biomass carbon on the basis of realizing waste resource and widens the application range of the waste tire pyrolytic carbon.

The technical scheme adopted by the invention is as follows: a preparation method of a waste tire resource material improved by excess sludge comprises the following specific steps:

(1) taking a certain amount of waste rubber tires, and grinding the waste rubber tires into small particles;

(2) carrying out oxygen-free high-temperature pyrolysis on the ground tire particles to form pyrolytic carbon;

(3) cleaning the pyrolytic carbon to remove substances such as ash, S and the like;

(4) taking a certain amount of excess sludge, and ultrasonically mixing the excess sludge and pyrolytic carbon to obtain a mixture;

(5) adding a binder into the mixture, and performing ultrasonic mixing again;

(6) and performing anaerobic high-temperature pyrolysis again to finally prepare the waste tire resource material with improved residual sludge.

Preferably, the particle size of the waste rubber tire particles is 1mm to 1 cm. Preferably, N is used as the gas for carrying out the oxygen-free high-temperature pyrolysis on the tire particles in the step (2)₂Or inert gas such as Ar; the temperature range is 300-1000 ℃, and the pyrolysis time is 1-10 h.

Preferably, the ultrasonic frequency in the step (4) is 40-100Hz, and the mixing time is 1-10 h.

Preferably, the concentration of the excess sludge in the step (4) is 0.1g/L-10g/L, and the addition amount of the excess sludge is 1-10 times of the mass of the tire.

Preferably, the binder in step (5) is methyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, carboxymethyl cellulose, polyoxyethylene, polyvinyl alcohol, or the like.

Preferably, the concentration of the binder in the step (5) is 0.01g/L-1 g/L; the addition amount of the binder is 2-15 times of the mass of the tire.

Preferably, the ultrasonic frequency in the step (5) is 50-100Hz, and the mixing time is 1-24 h.

Preferably, the temperature range of the oxygen-free high-temperature pyrolysis in the step (6) is 400-.

Furthermore, the prepared waste tire resource material improved by the excess sludge has the application range of biological biofilm carrier, electrode material or adsorbing material and the like.

Has the advantages that:

the beneficial effects of the above technical scheme are that: based on the principle of 'waste improvement-making good for others' and the like, the waste tire pyrolytic carbon and the excess sludge biomass carbon are organically combined, the defect of the waste tire pyrolytic carbon is overcome by utilizing the good biocompatibility of the excess sludge biomass carbon, the problem of reasonable disposal of waste is solved, and the novel carbon-carbon composite material of the tire pyrolytic carbon-the excess sludge biomass carbon, which has the advantages of good biocompatibility, strong hydrophilicity and the like, is prepared, can be used as a biofilm carrier, an electrode material and an adsorbing material, and the application range of the waste tire pyrolytic carbon is widened.

Drawings

FIG. 1 is a flow chart of a waste tire recycling material improved by excess sludge according to the present invention.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the following description is given in conjunction with the accompanying examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.

Example 1

Taking 10g of waste rubber tires, crushing and grinding the waste rubber tires to form particles with the particle size of 1mm, wherein the tire particles are in the range of N₂Pyrolyzing at 300 ℃ for 2h in an atmosphere to form pyrolytic carbon particles of waste tires, taking 100g of residual sludge with the concentration of 10g/L and the pyrolytic carbon particles to perform 40Hz ultrasonic mixing for 10h, adding 150g of methylcellulose with the concentration of 0.05g/L after mixing, and performing 50Hz ultrasonic mixing for 1 h. Then the pyrolytic carbon adhered with the excess sludge is added into N₂And (3) pyrolyzing for 10h at 400 ℃ in the atmosphere to finally prepare the waste tire carbon material improved by the residual sludge. The prepared carbon material is used for biofilm formation, common waste tire pyrolytic carbon is used as a contrast, and the performance of the waste tire carbon material biofilm formation improved by the excess sludge is as shown in the following table.

Name of Material	Film hanging time (d)
		Pyrolytic carbon for common waste tire	40
Waste tire carbon material improved by residual sludge	25

Example 2

Taking 20g of waste rubber tires, crushing and grinding the waste rubber tires to form particles with the particle size of 0.5cm, wherein the tire particles are in the range of N₂Pyrolyzing at 600 ℃ for 5h in an atmosphere to form pyrolytic carbon particles of waste tires, taking 100g of residual sludge with the concentration of 5g/L and the pyrolytic carbon particles to perform 70Hz ultrasonic mixing for 6h, adding 200g of hydroxyethyl cellulose with the concentration of 0.5g/L after mixing, and performing 95Hz ultrasonic mixing for 12 h. Then the pyrolytic carbon adhered with the excess sludge is added into N₂Pyrolyzing for 7h at 700 ℃ in the atmosphere to finally prepare the waste tire carbon material improved by the residual sludge. The prepared carbon material is used as an electrode material, common waste tire pyrolytic carbon is used as a contrast, and the electrochemical properties of the waste tire carbon material improved by the excess sludge are shown in the following table.

Name of Material	Cyclic voltammetric peak current (mA)
		Pyrolytic carbon for common waste tire	1.6
Waste tire carbon material improved by residual sludge	3

Example 3

Taking 50g of waste rubber tires, crushing and grinding the waste rubber tires to form particles with the particle size of 1cm, placing the tire particles in Ar atmosphere,pyrolyzing for 10h at 1000 ℃ to form pyrolytic carbon particles of waste tires, taking 50g of residual sludge with the concentration of 0.1g/L and carrying out 100Hz ultrasonic mixing on the pyrolytic carbon particles for 2h, adding 100g of polyoxyethylene with the concentration of 1.0g/L after mixing, and carrying out 75Hz ultrasonic mixing for 24 h. Then the pyrolytic carbon adhered with the excess sludge is added into N₂Pyrolyzing for 4h at 1000 ℃ in the atmosphere to finally prepare the waste tire carbon material improved by the residual sludge. The prepared carbon material is used for adsorbing materials, common waste tire pyrolytic carbon is used as a contrast, and phenol, phenanthrene and Cu are used²⁺The adsorption performance of the carbon material of the waste tire, which is used as the adsorption object and is modified by the residual sludge, is shown in the following table.

Waste tire carbon Material adsorption Performance Table with sludge modified under different conditions (adsorption Capacity ζ/(mg. g))

Claims

1. A method for preparing a waste tire recycling material improved by excess sludge, the specific steps of which are as follows:

(1) Take a certain amount of waste rubber tires and grind them into small particles;

(2) The ground tire particles are subjected to anaerobic high temperature pyrolysis to form pyrolytic carbon;

(3) Clean the pyrolytic carbon;

(4) Take a certain amount of excess sludge, and ultrasonically mix the excess sludge and pyrolysis carbon to obtain a mixture;

(5) Add a binder to the mixture, and perform ultrasonic mixing again;

(6) Carry out anaerobic high-temperature pyrolysis again, and finally make waste tire recycling material improved by excess sludge.

2 . The preparation method according to claim 1 , wherein the particle size of the waste rubber tire particles is 1 mm-1 cm. 3 .

3. The preparation method according to claim 1, characterized in that: in step (2), the gas used for anaerobic high-temperature pyrolysis of tire particles is N ₂ or Ar; the temperature range is 300-1000 ^° C, and the pyrolysis time is 1-10 hours.

4 . The preparation method according to claim 1 , wherein the frequency of ultrasonic mixing in step (4) is 40-100 Hz, and the time of ultrasonic mixing is 1-10 h. 5 .

5 . The preparation method according to claim 1 , wherein the concentration of the excess sludge in step (4) is 0.1 g/L-10 g/L, and the addition amount of the excess sludge is 1-10 g/L of the tire mass. 6 . times.

6 . The preparation method according to claim 1 , wherein the binder described in step (5) is methyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, and carboxymethyl cellulose. 7 . , polyoxyethylene or polyvinyl alcohol.

7. The preparation method according to claim 1, characterized in that: in step (5), the concentration of the binder is 0.01 g/L-1 g/L; the addition amount of the binder is 2-15 g/L of the tire mass times.

8 . The preparation method according to claim 1 , wherein the ultrasonic frequency in step (5) is 50-100 Hz, and the mixing time is 1-24 h. 9 .

9 . The preparation method according to claim 1 , wherein the temperature range of the oxygen-free high temperature pyrolysis in step (6) is 400-1000 ^° C, and the pyrolysis time is 2-10 h. 10 .

10 . The preparation method according to claim 1 , wherein the prepared waste tire recycling material improved by excess sludge can be used in biological film carrier, electrode material or adsorption material. 11 .