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Recycling method of leading waste water into grinding chamber body in MDF production

A fiberboard, medium-density technology, applied in fiber raw materials, fiber raw material processing, chemical instruments and methods, etc., can solve problems such as carbon deposition, and achieve the effects of reducing costs, saving production water, and achieving good economic and social benefits.

Inactive Publication Date: 2010-08-11
FUJIAN AGRI & FORESTRY UNIV
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Problems solved by technology

This method not only solves the problem of difficult treatment of waste water extruded by the heat refiner, but also solves the problem of water shortage in the heat grinding process, improves the heat grinding conditions of the heat refiner, and reuses the lignin and semi-fibers in the waste water Soluble and other solids make full use of resources, improve product quality, and solve the problem of carbon deposition in the alveolar of the grinding disc

Method used

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  • Recycling method of leading waste water into grinding chamber body in MDF production
  • Recycling method of leading waste water into grinding chamber body in MDF production

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specific Embodiment

[0010] The waste water (average 2000kg per hour) extruded by the thermal mill is introduced into the launder, and after being filtered and slag-removed by a roller net with a mesh diameter of 6mm, the waste water flows into the sedimentation tank, and after static flow sedimentation, it is suspended in the waste water by gravity method. The sand and other sundries in the waste water can be removed to remove sand and other sundries. After the precipitated wastewater (temperature is 27°C) enters the water tank through the overflow tank, the temperature of the wastewater is controlled. When the temperature drops to 20°C, the wastewater is heated to keep the temperature of the wastewater between 20-70°C. The heated wastewater is transported to the grinding chamber of the thermal refiner through the pre-installed interface of the thermal refiner by a quantitative high-pressure water pump. The amount of wastewater pumped into the grinding chamber of the thermal refiner is 1200kg per ...

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Abstract

The invention relates to a recycling method of leading waste water into a grinding chamber body in a MDF production. The waste water extruded from a defibrator in the MDF hot grinding technology is filtered and deposited. The temperature of the waste water is controlled within 20 to 70 degrees centigrade. The waste water is transmitted to the grinding chamber body of the defibrator to be recycled. The method solves not only the difficult processing problem of the waste water extruded from the defibrator but also the water shortage problem of the hot grinding process, saves production water supply, recycles lignin, hemicellulose and other condensates in the waste water, makes the best use of energy resources, saves the cost of processing the waste water and has the obvious characteristic of saving energy, and environmental protection and good economic and social benefit.

Description

technical field [0001] The invention relates to a recycling method for introducing waste water in the production of medium-density fiberboard into a mill chamber. Background technique [0002] During the production of medium density fiberboard, a large amount of wastewater will be generated. The wastewater contains soluble organic matter such as cellulose, hemicellulose, and resin, as well as a large amount of mechanical particles and suspended solids such as mud, bark, and wood chips, which pollute the environment. At present, my country mainly adopts hydrolytic acidification-aerobic-coagulation-sedimentation process and hydrolytic acidification-aerobic-air flotation treatment process for the treatment of medium density fiberboard production wastewater in China, but the quality of the treated wastewater is poor, except for a small part of reuse Except for the washing of wood chips, the rest can only be discharged, which not only pollutes the environment, but also causes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/14C02F9/02
Inventor 谢拥群陈岩飞张共魏起华
Owner FUJIAN AGRI & FORESTRY UNIV
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