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Method and complete set of equipment for making high-quality pore-forming agent by using waste straws

A technology of waste straw and complete equipment, which is applied in the production of high-quality porous ceramsite and the utilization of solid waste as a resource. It can solve the problems of large gas generation, poor grinding performance, and uneven pore structure of porous materials. Achieve the effect of accelerating the construction process and solving the surplus labor force

Inactive Publication Date: 2011-01-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Agricultural wastes contain a large amount of organic substances, which can be used as foaming agents in the production process of porous materials when oxidized at high temperatures to release gases. However, there are two disadvantages when using such wastes as foaming agents. Disadvantages: (1) The cellulose rich in agricultural waste leads to poor grinding performance; (2) The amount of gas generated per unit mass of waste is large, resulting in uneven pore structure and excessive single pore volume in the prepared porous material. big and out of control

Method used

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  • Method and complete set of equipment for making high-quality pore-forming agent by using waste straws
  • Method and complete set of equipment for making high-quality pore-forming agent by using waste straws
  • Method and complete set of equipment for making high-quality pore-forming agent by using waste straws

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Effect test

Embodiment 1

[0020] The method and complete set of equipment for preparing a high-quality pore-forming agent from waste straw mainly include two processes, namely: a heat treatment process and a ball milling and screening process. The equipment used includes: shear pulverizer, indirect contact rotary heating furnace, planetary ball mill, reciprocating vibrating multi-stage sieve.

[0021] Heat treatment process: Take 100g of rice husk or rice straw, which needs to be crushed into pieces smaller than 2cm on a shearing mill, and then put into a quartz tube. The quartz tube is placed in an indirect contact electric tube furnace for heat treatment, the heating rate is controlled at 30°C / min, and the furnace temperature is kept at 300°C for 3 minutes. figure 1 It shows the relationship between different heating temperatures and the time required for the product to reach constant weight. Complete carbonization can be achieved at 300°C, and no open flame can be observed during the heat treatment ...

Embodiment 2

[0024] A method and a complete set of equipment for preparing a high-quality pore-forming agent from waste straw, including the following steps:

[0025] (a) Pretreatment: Utilize the shear pulverizer to cut the discarded straw into 1cm pieces;

[0026] (b) Heat treatment: loosely stack the sheared straw in an indirect contact rotary heating furnace, heat it to 300°C in an air atmosphere, control the heating rate at 35°C / min, stop heating after keeping it for 2 minutes, and let it cool naturally to room temperature;

[0027] (c) Grinding treatment: Grinding the carbonized stalk carbon in a planetary ball mill for 1 minute, the speed is controlled at 300 rpm;

[0028] (d) Classification treatment: use reciprocating vibration multi-stage sieve to classify the carbonized product after grinding, and the product can be divided into (1)>2mm pore-forming agent; (2)2mm-1mm pore-forming agent; (3) 1mm-0.5mm pore-forming agent; (4) 0.5mm-0.1mm pore-forming agent; (5) <0.1mm pore-formi...

Embodiment 3

[0030] A method and a complete set of equipment for preparing a high-quality pore-forming agent from waste straw, including the following steps:

[0031] (a) Pretreatment: Utilize the shear pulverizer to cut the discarded straw into 5cm pieces;

[0032] (b) Heat treatment: loosely stack the sheared straw in an indirect contact rotary heating furnace, heat to 400°C in an air atmosphere, control the heating rate at 25°C / min, stop heating after keeping for 5 minutes, and cool naturally to room temperature;

[0033] (c) Grinding treatment: Grinding the carbonized stalk carbon in a planetary ball mill for 5 minutes, the rotating speed is controlled at 100 rpm;

[0034] (d) Classification treatment: use reciprocating vibration multi-stage sieve to classify the carbonized product after grinding, and the product can be divided into (1)>2mm pore-forming agent; (2)2mm-1mm pore-forming agent; (3) 1mm-0.5mm pore-forming agent; (4) 0.5mm-0.1mm pore-forming agent; (5) <0.1mm pore-forming ...

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Abstract

The invention establishes a process flow for making a high-quality pore-forming agent by using waste straws in view of the current situation that serious resource waste, environmental pollution and potential safety hazard are caused by burning or discarding a large number of waste straws in situ after crops are harvested in China. The process overcomes the defects of the traditional process of producing the pore-forming agent, has simple and convenient operation, small investment and not high facility requirement and is especially applicable to small and medium township enterprises. The produced pore-forming agent is mainly suitable for producing porous materials, especially high-quality porous ceramic granules and foam glass.

Description

technical field [0001] The invention relates to a method for preparing a pore-forming agent by using agricultural waste straw, which belongs to a new technology for resource utilization of solid waste in the field of environmental protection and comprehensive utilization of resources, and is suitable for high value-added resource utilization and pollution control of agricultural waste produced in large quantities . The prepared pore-forming agent is mainly used in the production of porous ceramics and foam glass, and is especially suitable for the production of high-quality porous ceramsite. Background technique [0002] At present, the research and development of porous materials has been widely concerned by people. This kind of materials are more and more widely used in energy, environmental protection, and chemical industry, and have brought considerable economic and social benefits. In the manufacturing process of porous materials, pore-forming agents are one of the imp...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/63C03C11/00B09B3/00
Inventor 张付申王川
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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