Unlock instant, AI-driven research and patent intelligence for your innovation.

Recycling method of silicon carbide micropowder in filter cake of filter press

A medium silicon carbide, filter press technology, applied in the direction of silicon carbide, carbide, etc., can solve the problems of affecting the plant environment and waste of resources, and achieve the effect of improving the plant environment, increasing the content of silicon carbide, and increasing the content of

Inactive Publication Date: 2018-07-20
HENAN XINDAXIN SCI & TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the filter cake of the filter press is obtained after the waste water is pressed, if it is not treated, it will affect the environment of the factory area on the one hand, and cause waste of resources on the other hand

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Recycling method of silicon carbide micropowder in filter cake of filter press

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: A method for recycling silicon carbide micropowder in filter cake of filter press, including the following steps:

[0020] (1) In a 5L pickling tank, add 2000kg of filter cake, and inject 4000kg of 70-80℃ water, stir to make all the added filter cake dissolve and make the slurry evenly distributed.

[0021] (2) Add 400kg of sulfuric acid to the slurry obtained in step (1), stir for 30 minutes, stop the stirring after the sulfuric acid and the slurry are evenly mixed, and after soaking for 5-8 hours, detect the free carbon and free iron in the silicon carbide powder in the slurry When the iron content is less than 0.15% and the carbon content is less than 0.40%, the upper clarified water is discharged.

[0022] (3) Pour 4000 kg of 70-80°C water into the material obtained in step (2), add 160 kg of sodium hydroxide after stirring, and continue stirring. After the alkali and the slurry are fully mixed, stop stirring and soak for 2 to 3 hours. Remove the silicon powder...

Embodiment 2

[0025] Embodiment 2: A method for recycling silicon carbide micropowder in the filter cake of a filter press. The difference from Embodiment 1 is that the acid added in step (2) is nitric acid, phosphoric acid or hydrochloric acid.

Embodiment 3

[0026] Example 3: A method for recycling silicon carbide powder in the filter cake of a filter press, which is different from Example 1 in that the acid added in step (2) is at least two of sulfuric acid, nitric acid, phosphoric acid, and hydrochloric acid mixture.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for recycling silicon carbide micro-powder in filter cake of a filter press. The method comprises the steps of slurry making, acid cleaning, alkali cleaning, carbon removing, grading and the like. According to the method for recycling the silicon carbide micro-powder in the filter cake of the filter press, acid cleaning and alkali cleaning are combined for use, free carbon and free iron in the filter cake are removed, cleaning and oil film removing are conducted on the filter cake, the content of silicon carbide in the filter cake is increased, and grading is conducted on silicon carbide in the filter cake so as to achieve recycling of the filter cake. By means of the method for recycling the silicon carbide micro-powder in the filter cake of the filter press, the workshop factory environment is improved, and effective utilization of resources is achieved.

Description

Technical field [0001] The invention relates to the technical field of cutting blade materials for solar crystalline silicon wafers, in particular to a method for recycling silicon carbide powder in the filter cake of a filter press. Background technique [0002] Silicon carbide micropowder is a cutting blade material used for cutting solar crystalline silicon wafers. In the water classification treatment, a part of the material will be lost with the discharge of waste water. It needs to be filtered when the waste water is discharged. , Thereby improving the quality of discharged water to meet national wastewater discharge standards. Wastewater pressure filtration is a commonly used method in wastewater treatment to achieve the purpose of reducing solid content. The filter press filter cake is obtained after the waste water is press-filtered. If it is not treated, it will affect the plant environment on the one hand and waste resources on the other hand. In view of this problem...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/956
CPCC01P2004/60C01P2006/80
Inventor 黄萱怡孙毅陈亚丽申君来杨正宏辛玲高敏杰
Owner HENAN XINDAXIN SCI & TECH