Preparation method of rice straw black carbon

Abstract

The invention discloses a preparation method of rice straw black carbon and belongs to the field of black carbon preparation. The preparation method comprises the following steps: (1) conveying rice straws into a tubular furnace and carrying out thermal decomposition to obtain plant ash; (2) adding the plant ash into hydrochloric acid and obtaining a mixed solution I; (3) carrying out standing andfiltering on the mixed solution I to obtain a filtering solid matter; (4) after washing the filtering solid matter, adding hydrofluoric acid and hydrochloride to obtain a mixed solution II; conveyingthe rice straws into the tubular furnace and carrying out the thermal decomposition to obtain plant ash; adding the plant ash into the hydrochloric acid and carrying out standing and filtering to obtain a filtering solid matter; after adding the hydrochloric acid and the hydrofluoric acid into the filtering solid matter, carrying out refining and filtering to obtain a solid matter, and washing the solid matter with ionized water to prepare a neutral solid; after drying the neutral solid, grinding and crushing to obtain powdery black carbon. By adopting the preparation method provided by the invention, the problem that rural crop straws are wasted can be solved and a foundation also can be laid for resource utilization of solid wastes; the preparation method can be used for preparing the rice straw black carbon.

Description

Technical field [0001] The invention relates to a preparation method of black charcoal, in particular to a preparation method of rice straw black charcoal. Background technique [0002] my country is a large agricultural country, and agricultural waste has the characteristics of large yield and variety. The annual crop straw produced alone is as high as 7.0×108t. With the rapid increase in population and the rapid development of agriculture, my country's agricultural waste is increasing at a rate of 5% to 10% per year. If this part of solid waste is not properly disposed of, it will not only waste resources but also cause tremendous pressure on the environment. At present, the most commonly used solid waste disposal methods mainly include three methods: landfill, heat treatment and biological treatment. Although the landfill treatment technology has simple operation, large processing capacity, wide adaptability, low one-time investment, and simple operation and management Howeve...

AI Technical Summary

Problems solved by technology

With the rapid increase of population and the rapid development of agriculture, my country's agricultural waste is growing at a rate of 5% to 10% per year. If this part of solid waste is not properly disposed of, it will not only waste resources but also cause huge pressure on the environment.

At present, the most commonly used solid waste disposal methods are: landfill, heat treatment and biological treatment. Although the landfill treatment technology has the advantages of simple operation, large processing capacity, wide adaptability, low one-time investment, and simple operation and management and other advantages, but the technology occupies a large area, is easy to cause secondary pollution to the environment, and cannot realize the recycling of solid waste well; heat treatment technologies include incineration, pyrolysis, roasting, sintering, etc., and currently more commonly used are incineration and The advantage of pyrolysis and incineration is that it can reduce the volume of solid waste, but the equipment for incineration treatment has serious corrosion and high operating costs. If the harmful gas produced by incineration is not properly disposed of, it will easily cause air pollution. Pyrolysis treatment is an oxygen-free The advantage of pyrolysis treatment is that it can convert the organic components in solid waste into storable energy such as combustible gas and fuel oil, and the exhaust volume is small without causing secondary air pollution. Applied prospect of solid waste disposal; biological treatment technology has high requirements on solid waste classification and operation technology, improper operation will not only cause poor quality of compost products, but also easily cause secondary pollution of the environment, at the same time, subject to current technology Large-scale production cannot be achieved due to limitations

With the continuous development of economy and technology, and the continuous improvement of agricultural production level, new technologies such as using straw-like agricultural waste to return to the field, as fuel and feed are emerging, but the comprehensive utilization rate of agricultural waste is less than 10%.

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