Chemical extraction and recovery method for carbon black after waste rubber decomposition

Abstract

The invention provides a chemical extraction and recovery method for carbon black after waste rubber decomposition. The chemical extraction and recovery method at least comprises following steps: providing a decomposed solid which is obtained through waste rubber decomposition; providing an acid solution, placing the acid solution and the decomposed solid in a stirring device, carrying out a firststirring process, and generating a first mixed solution; separating the first mixed solution into a first solution and a first precipitate through a first separation process, and obtaining a first metallic compound from the first solution through a first dehydration process; providing an alkaline solution, placing the alkaline solution and the first precipitate in the stirring device, carrying out a second stirring process, and generating a second mixed solution; separating the second mixed solution into a second solution and a second precipitate through a second separation process, and obtaining a second metallic compound from the second solution through a second dehydration process; and obtaining carbon black from the second precipitate through a third dehydration process.

Description

technical field [0001] The invention relates to a method for extracting and recovering chemicals from carbon black after waste rubber cracking, in particular to recycling sulfur dioxide produced in waste rubber cracking process, reusing high-value chemicals, and improving the quality of carbon black. The extraction and recovery method of carbon black. Background technique [0002] Nowadays, people around the world communicate frequently, and as a result of frequent exchanges, people from all over the world continue to move to different places, which greatly increases the demand for transportation tools. No matter taking an airplane or a vehicle, tires are required, and the usage of tires is also greatly increased. The increase in the use of tires increases the number of tires that need to be replaced due to wear and tear, and the tires are rubber products. Therefore, the recovery and reuse of waste rubber has become an important issue. [0003] The main technology for recyc...

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Problems solved by technology

[0004] In order to remove sulfur dioxide, the air pollution factor, the easiest way is to wash and intercept the burned sulfur dioxide with water in the scrubber. Sulfur dioxide is easily dissolved in water in the scrubber to form a sulfuric acid solution. The sulfuric acid solution needs to be neutralized with lye. It can be discharged or entered into the wastewater treatment system for further treatment, resulting in waste of resources and increased treatment costs and environmental burdens

[0005] The carbon black in the rubber component is the main recycling target in the current technology. Carbon black is the reinforcing material of the rubber mixture. Due to its excellent stability, carbon black can be recycled and reused in theory. However, due to the rubber formula It is necessary to add other metal and non-metal oxides or compounds to meet the basic specifications used in general commercial use. Such substances cannot be separated from solid carbon black in the waste rubber cracking process, or because of high temperature cracking, Part of the substance also participates in the chemical reaction, resulting in additional ash, the so-called carbon black ash

Therefore, the purity of carbon black is not good, generally containing about 10-20% ash, which affects the reinforcing effect of recycled carbon black added to rubber, greatly reducing the applicability and marketability of recycled carbon black in rubber, It also leads to great restrictions on the development of waste rubber cracking and recycling industry

[0006] The current technology mainly uses acidic solution and chelating agent to carry out pickling process on carbon black. The ash of carbon black is chemically reacted with acidic solution, and the metal ion in the ash of carbon black is chelated and separated by chelating agent. The main technology to reduce the ash content of carbon black, however, because additional chelating agents are added, it also increases the processing cost and the burden on the environment

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