Green Process Path of Dust Ash Treatment and Straw Carbonization by Rotary Tube Furnace

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Green Process Path of Dust Ash Treatment and Straw Carbonization by Rotary Tube Furnace

1. Background and Significance of the Process
In the field of industrial solid waste treatment and agricultural waste resource utilization, the treatment of dust ash and straw has always been the focus of the industry. As a solid waste generated in industrial production processes such as iron and steel and electric power, dust ash will not only occupy a large amount of land resources if randomly stacked, but also the harmful substances such as heavy metals contained in it may penetrate into the soil and groundwater, causing serious pollution to the ecological environment. Straw, as a by - product of agricultural production, has a huge annual output. The traditional incineration treatment method not only wastes resources, but also produces a large amount of harmful gases, aggravating air pollution.

The rotary tube furnace, as an efficient thermal equipment, with its characteristics of precise temperature control, uniform material heating and high treatment efficiency, provides a new technical direction for the coordinated treatment of dust ash and straw. The green process path combining dust ash treatment and straw carbonization can not only realize the reduction and harmless treatment of the two wastes, but also convert them into products with high added value such as carbon - based materials, truly realizing "turning waste into treasure". It is of great practical significance for promoting the development of circular economy and helping to achieve the "double carbon" goal.

2. Process Principle and Flow

2.1 Process Principle
This green process path is mainly based on pyrolysis carbonization technology. It uses the stable high - temperature environment provided by the rotary tube furnace to make the straw undergo pyrolysis reaction under anoxic or low - oxygen conditions, decomposing to produce products such as carbon, combustible gas and tar, among which carbon is straw carbon. At the same time, under the high - temperature environment, the harmful impurities in the dust ash undergo thermal decomposition or solidification reaction, and have physical and chemical reactions with the carbon produced during the straw pyrolysis process, finally forming a stable and harmless composite carbon - based material.

During the whole process, the rotation of the rotary tube furnace can ensure that the materials are evenly turned over in the furnace, fully contact with the heat source, and avoid local overheating or uneven heating, thus ensuring the stability of the process and the treatment effect. In addition, by accurately controlling parameters such as the temperature in the furnace, atmosphere (such as nitrogen atmosphere) and residence time, the quality of straw carbon and the harmless treatment degree of dust ash can be effectively adjusted.

2.2 Process Flow
Raw Material Pretreatment: First, the collected dust ash is screened and ground to remove large impurities, making its particle size uniform, which is convenient for subsequent mixing with straw. At the same time, the straw is cut and dried to reduce the moisture content of the straw (generally controlled at 10% - 15%) and improve the pyrolysis efficiency.
Material Mixing: The pretreated dust ash and straw are mixed evenly according to a certain mass ratio (usually the ratio of dust ash to straw is 1:3 - 1:5) to form a mixed material. A small amount of binder can be added during the mixing process to improve the forming performance of the mixed material, facilitating subsequent transportation and stable reaction in the furnace.
Pyrolysis Carbonization in Rotary Tube Furnace: The mixed material is continuously fed into the rotary tube furnace through the feeding device. The temperature in the furnace is controlled at 500 - 800℃, and a small amount of nitrogen is introduced into the furnace to create an anoxic environment. Under the rotation of the furnace body, the mixed material moves forward slowly, fully contacts with the furnace wall and heat source, and undergoes pyrolysis carbonization reaction. The straw is gradually decomposed into carbon, combustible gas and tar, and the harmful impurities in the dust ash are effectively treated and closely combined with the straw carbon.

Product Collection and Treatment: After the completion of the pyrolysis carbonization reaction, the generated composite carbon - based material is discharged from the discharge end of the rotary tube furnace. After cooling, crushing and screening, the finished carbon - based materials with different particle size specifications are obtained, which can be used in fields such as soil improvement, adsorption materials and fuels. The combustible gas generated during the reaction can be used as fuel to provide heat for the rotary tube furnace after purification treatment, realizing the cyclic utilization of energy. The tar is recovered through a special collection device and can be used to produce chemical products after deep processing.

3. Process Advantages
3.1 Environmental Friendliness
This process can realize the harmless treatment of dust ash and straw at the same time. The harmful substances such as heavy metals in the dust ash are solidified in the composite carbon - based material at high temperature, which effectively avoids their pollution to the soil and groundwater. The straw is treated by pyrolysis carbonization, replacing the traditional incineration method, which greatly reduces the emission of harmful gases such as carbon dioxide and sulfur dioxide, and reduces the pollution to the air environment. In addition, the combustible gas generated in the process can be recycled, reducing the consumption of fossil energy and further reducing carbon emissions.

3.2 High Resource Utilization Rate
Through this process, the two wastes of dust ash and straw are converted into composite carbon - based materials with high added value, realizing the efficient recovery and utilization of resources. The composite carbon - based material has a rich pore structure, large specific surface area and good adsorption performance. In terms of soil improvement, it can increase the content of soil organic matter, improve the soil structure and enhance the soil fertility. In the field of adsorption materials, it can be used for adsorbing heavy metal ions and organic pollutants in wastewater treatment. At the same time, it can also be used as a clean fuel, with good economic benefits and market prospects.

3.3 Strong Process Stability
The rotary tube furnace has good temperature control performance and material mixing effect, which can ensure the stable control of process parameters, thus ensuring the consistency of product quality. The rotating design of the furnace body makes the materials heated evenly, avoiding problems such as material sintering or incomplete carbonization caused by local overheating. In addition, the process can realize continuous production with high treatment efficiency, which is suitable for large - scale industrial application.

4. Application Prospect and Outlook
With the increasing attention of the country to environmental protection and resource recycling, and the continuous promotion of the "double carbon" goal, the green process path of dust ash treatment and straw carbonization by rotary tube furnace has broad application prospects. In the industrial field, this process can be used in enterprises that produce a large amount of dust ash such as iron and steel plants and power plants, realizing the on - site treatment and resource utilization of industrial solid waste, and reducing the solid waste treatment cost of enterprises. In the agricultural field, it can convert local straw resources into high - quality carbon - based fertilizers, promoting the green and sustainable development of agriculture.
In the future, with the continuous innovation and optimization of technology, this process can further expand its application scope. For example, by adjusting process parameters and raw material ratio, composite carbon - based materials with more excellent performance can be developed for high - end adsorption materials, energy storage materials and other fields. At the same time, we can strengthen the collaborative integration with other environmental protection technologies, build a more perfect waste resource utilization system, and provide strong support for realizing the improvement of the ecological environment and the sustainable development of the economy and society.

Zhengzhou Protech Technology Co.,LTD is a professional manufacturer specializing in tube furnaces, muffle furnaces, atmosphere furnaces, and vacuum furnaces. We are committed to providing targeted solutions to meet your diverse heating equipment needs.

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Green Process Path of Dust Ash Treatment and Straw Carbonization by Rotary Tube Furnace

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