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Method for low-temperature synthesis of silicon carbide from agricultural wastes

An agricultural waste, silicon carbide technology, applied in the direction of solid waste removal, etc., can solve the problems of increasing the production cost of silicon carbide, increasing energy consumption, and high equipment requirements, and achieving low price, low equipment investment cost, and low density. Effect

Inactive Publication Date: 2010-11-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to the high temperature in the general silicon carbide synthesis method, the requirements for equipment are high, and the energy loss is increased, thereby increasing the production cost of silicon carbide

Method used

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  • Method for low-temperature synthesis of silicon carbide from agricultural wastes
  • Method for low-temperature synthesis of silicon carbide from agricultural wastes

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specific Embodiment approach

[0015] The invention proposes a method for synthesizing silicon carbide from agricultural waste at low temperature. The preparation process is simple and the production cost is low. The specific implementation method comprises the following steps:

[0016] The first step of preparation is to pyrolyze the agricultural waste under the condition of 400-900 degrees in an inert atmosphere. During the pyrolysis process, the organic matter in agricultural waste is decomposed by high temperature, and due to the protective effect of inert gases such as nitrogen, carbon dioxide, argon, etc., the main pyrolysis product of agricultural waste is SiO 2 and C.

[0017] The second step of preparation is to fully mix the pyrolysis product of agricultural waste with metal reducing agent powder such as metal magnesium powder, metal aluminum powder and metal zinc powder. The mixture is heated to 500-800 degrees under the protection of isolated air or inert gas, and reacts for 15-120 minutes. Th...

Embodiment 1

[0024] Embodiment 1: Taking rice husk as raw material

[0025] 1) 100 grams of rice husks are fully pulverized, put into a 900-degree furnace and calcined for 15 minutes under the protection of an inert gas to obtain pyrolysis products of rice husks;

[0026] 2) Fully mix the pyrolysis product with 2 grams of metal reducing agent powder, put the obtained mixture into a furnace, and calcine at 500°C for 120 minutes in isolation of air or under the protection of an inert gas;

[0027] 3) Add the product of step 2) into 1M non-oxidizing acid solution, and soak for 15 minutes; the product is centrifuged, washed with water, and dried in solid phase to obtain silicon carbide powder.

Embodiment 2

[0028] Embodiment 2: Taking rice straw as raw material

[0029] 1) Fully pulverize 100 grams of rice straw, put it into a 400-degree furnace and calcinate for 120 minutes under the protection of an inert gas to obtain a pyrolysis product of rice straw;

[0030] 2) Fully mix the pyrolysis product with 10 grams of metal reducing agent powder, put the obtained mixture into a furnace, and calcine at 800°C for 15 minutes in isolation of air or under the protection of an inert gas;

[0031] 3) Add the product of step 2) into a 0.05M non-oxidizing acid solution, and soak for 120 minutes; the product is centrifuged, washed with water, and dried in solid phase to obtain silicon carbide powder.

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Abstract

The invention discloses a method for low-temperature synthesis of silicon carbide from agricultural wastes. A large quantity of the agricultural wastes such as rice husk, straw, dry branches, fallen leaves and the like generated in China every year are very important undeveloped resources. The method comprises the following simple steps: firstly, heating and decomposing the agricultural wastes into power which comprises main components such as silica and carbon in an inert atmosphere; and mixing the power with a metallic reducing agent, and then calcining the obtained mixture at the temperature of 500-800 DEG C to obtain the silicon carbide. The silicon carbide, as an important semiconductor material, has unique physical and electronic properties and important application prospect in fields such as non-ferrous metal smelting, steel industry, metallurgical ore dressing industry, architectural ceramics, energy conservation, a wave-absorbing material and the like. The method for preparing the silicon carbide from the agricultural wastes provided by the invention has simple process flow, low formation temperature of the silicon carbide and low cost of raw materials, thus being an economical and effective method for utilizing the agricultural wastes.

Description

technical field [0001] The invention relates to a compound preparation method, in particular to a method for synthesizing silicon carbide from agricultural waste at low temperature. Background technique [0002] Agricultural waste refers to the general term for waste generated in the process of agricultural production and agricultural product processing, mainly including fruit shells and cores, straw, branches and leaves, and weeds. degradation characteristics. These agricultural wastes are rich in carbon and silicon and are important carbon and silicon resources. We are a big agricultural country, which produces hundreds of millions of tons of various agricultural wastes every year. However, most of the agricultural wastes are directly abandoned in the fields, forming serious resource waste and environmental problems. Recycling and harmless agricultural waste is an effective way to achieve sustainable agricultural development. [0003] Silicon carbide (SiC), also known a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36B09B3/00
Inventor 陈雪刚叶瑛夏枚生谭盛恒张奥博孙杰
Owner ZHEJIANG UNIV
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