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Pyrolytic carbon black deep deashing process

A technology for pyrolysis of carbon and carbon black, applied in the field of harmless and resource utilization of garbage, can solve the problems of incomplete separation, large amount of acid and alkali, hidden safety hazards of acid method, etc., and achieves low equipment investment and operating costs, The effect of simplifying the process and improving the efficiency

Inactive Publication Date: 2020-04-07
长沙工研院环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical deashing method uses surfactants to adsorb on the surface of carbon black, and separates carbon black and ash by flotation, but there is a problem of incomplete separation
The acid method uses inorganic acid (sulfuric acid / hydrochloric acid / nitric acid) to pickle to remove metal oxides and sulfur compounds in the ash, and then add HF to remove the remaining SiO in the ash 2 And silicate, but the reagent HF in it is poisonous, so you must be careful in the experiment, which leads to safety hazards in the acid method
The acid-base two-step method can effectively remove the ash in pyrolytic carbon black, but there are problems such as large amount of acid and alkali, large amount of waste liquid discharge, difficult to recycle, and easy to cause secondary pollution.

Method used

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  • Pyrolytic carbon black deep deashing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 5g of pyrolytic carbon black, 50mL of HCl acid solution, 0.05g of sodium hexametaphosphate, and 0.5g of citric acid were mixed and added into the reactor, heated to 50°C in a water bath in a 40kHz ultrasonic vibration environment, and reacted for 120min. Ionized water is prepared according to 1:1 (v:v). After the reaction, it was separated by suction filtration to obtain a solid filter residue and a filtrate. The solid filter residue was washed repeatedly with deionized water, and the filter residue and washing liquid were separated by suction filtration. Until the washing solution turns neutral, stop the washing process, dry and granulate, and make carbon black finished products. The ash content of the prepared carbon black is reduced from the initial 18.1% to 5.6%

Embodiment 2

[0037] Mix 5g pyrolytic carbon black with 50mL HCl acid solution, 0.05g sodium hexametaphosphate, and 0.5g disodium EDTA into the reactor, heat it in a water bath to 50°C in a 40kHz ultrasonic vibration environment and react for 120min, in which the acid solution is composed of concentrated hydrochloric acid and Deionized water is prepared according to 1:1 (v:v). After the reaction, it was separated by suction filtration. A solid residue and filtrate were obtained. The solid filter residue was washed repeatedly with deionized water, and the filter residue and washing liquid were separated by suction filtration. Until the washing solution turns neutral, stop the washing process, dry and granulate, and make carbon black finished products. The ash content of the prepared carbon black decreased from the initial 18.1% to 5.1%.

Embodiment 3

[0039] Mix 5g pyrolytic carbon black with 75mL HCl acid solution, 0.05g sodium hexametaphosphate, and 0.5g disodium EDTA into the reactor, and heat it in a water bath to 50°C for 120min in a 40kHz ultrasonic vibration environment. The acid solution is composed of concentrated hydrochloric acid and Deionized water is prepared according to 1:1 (v:v). After the reaction, it was separated by suction filtration. A solid residue and filtrate were obtained. The solid filter residue was washed repeatedly with deionized water, and the filter residue and washing liquid were separated by suction filtration. Until the washing solution turns neutral, stop the washing process, dry and granulate, and make carbon black finished products. The ash content of the prepared carbon black decreased from the initial 18.1% to 4.8%.

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Abstract

The invention discloses a pyrolytic carbon black deashing process which comprises the following steps: mixing pyrolytic carbon black, an acid solution, a dispersing agent and a complexing agent, reacting, carrying out solid-liquid separation to obtain filter residues and filtrate, cleaning the filter residues, and granulating to obtain a carbon black finished product. According to the scheme, thecomplexing agent is added into acid liquor, so that the acid liquor pickling and deashing efficiency is improved, the dispersing agent is used for strengthening the dispersity of the carbon black in the acid liquor, and the contact area of the acid liquor and the carbon black is increased; ultrasonic oscillation is used for assisting dispersion, so that the contact area of acid liquor and carbon black is increased; in conclusion, when the carbon black is subjected to acid pickling, one-step acid pickling, namely efficient deashing, is realized under the synergistic effect of the preferred hydrochloric acid solution, the dispersing agent, the complexing agent and ultrasonic waves, so that the process is greatly simplified, and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of harmless and resourceful utilization of garbage, and in particular relates to a pyrolysis carbon black deashing process. Background technique [0002] As one of the most effective methods at present, the pyrolysis of waste tires is more in line with the principles of solid waste recycling, harmlessness and reduction than other methods. The main products of pyrolysis treatment of waste tires include pyrolysis carbon black, pyrolysis oil and pyrolysis gas. Pyrolysis oil has the advantages of low ash content and residual carbon value. After certain treatment, it can replace part of fuel oil and alleviate the shortage of petroleum and other energy sources to a certain extent. Pyrolysis gas has high calorific value and low sulfur, and is an excellent gas fuel, which can be used in gas-fired power generation, heating and other fields. However, due to the high ash content of the remaining pyrolytic carbon blac...

Claims

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Application Information

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IPC IPC(8): C09C1/56C09C3/04C09C3/06C09C3/08
CPCC09C1/56C09C3/04C09C3/06C09C3/08
Inventor 贺升
Owner 长沙工研院环保有限公司
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