Preparation method of gradient silicon carbide ceramic membrane for water purification

A technology of gradient silicon carbide and silicon carbide ceramics, which is applied in the field of material science and engineering, can solve the problems of low water flux, large discharge, and increased pollution control costs, and achieve high connected porosity, high bonding strength, The effect of high flux of pure water

Active Publication Date: 2014-12-03
湖北迪洁膜科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in terms of industrial wastewater, the wastewater often has the characteristics of large discharge, high temperature, high alkalinity, high acidity, and heavy metals, which puts forward higher requirements for the filtration performance of inorganic ceramic membranes. The currently widely used alumina membrane material , it is difficult to resist strong acid and strong alkali environment, which shortens the service life of alumina membrane materials, speeds up the replacement cycle of membrane materials, and greatly increases the cost of sewage treatment
In addition, the hydrophilic properties of alumina membrane materials are average, resulting in low flux of water treatment, low sewage treatment efficiency, and increased pollution control costs to a certain extent

Method used

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  • Preparation method of gradient silicon carbide ceramic membrane for water purification

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Preparation of silicon carbide ceramic support body

[0036] A1. Selection of raw materials: Silicon carbide powder, silicone polymer, asphalt, kerosene are selected according to the mass ratio of 100:8:7:3 for standby;

[0037] B1. Mixing of raw materials: first mix silicon carbide powder and silicone polymer to form a mixture, then mix asphalt and kerosene to form a mixture, and finally mix the obtained mixtures again;

[0038] C1. Forming of the silicon carbide ceramic support blank: put the mixture obtained in step B1 into an extrusion molding machine, and form it into a multi-channel tubular blank;

[0039] D1. Firing of silicon carbide ceramic support body: put the silicon carbide ceramic support body blank into a tube furnace, raise the temperature to 400 °C at a rate of 6 °C / min, and then increase the temperature to 1400-1400 at a rate of 9 °C / min 1500°C, keep it warm for 1h, and cool to room temperature with the furnace to prepare a silicon carbide ceramic ...

Embodiment 2

[0057] 1) Preparation of silicon carbide ceramic support body

[0058] A1. Selection of raw materials: Silicon carbide powder, silicone polymer, asphalt, kerosene are selected according to the mass ratio of 100:9:7:4 for standby;

[0059] B1. Mixing of raw materials: first mix silicon carbide powder and silicone polymer to form a mixture, then mix asphalt and kerosene to form a mixture, and finally mix the obtained mixtures again;

[0060] C1. Forming of the silicon carbide ceramic support blank: put the mixture obtained in step B1 into an extrusion molding machine, and form it into a multi-channel tubular blank;

[0061] D1. Firing of silicon carbide ceramic support body: put the silicon carbide ceramic support body blank into a tube furnace, raise the temperature to 400 °C at a rate of 6 °C / min, and then increase the temperature to 1400-1400 at a rate of 9 °C / min 1500°C, keep it warm for 1h, and cool to room temperature with the furnace to prepare a silicon carbide ceramic ...

Embodiment 3

[0078] 1) Preparation of silicon carbide ceramic support body

[0079] A1. Selection of raw materials: Silicon carbide powder, silicone polymer, asphalt and kerosene are selected according to the mass ratio of 100:10:8:4 for standby;

[0080] B1. Mixing of raw materials: first mix silicon carbide powder and silicone polymer to form a mixture, then mix asphalt and kerosene to form a mixture, and finally mix the obtained mixtures again;

[0081] C1. Forming of the silicon carbide ceramic support blank: put the mixture obtained in step B1 into an extrusion molding machine, and form it into a multi-channel tubular blank;

[0082] D1. Firing of silicon carbide ceramic support body: put the silicon carbide ceramic support body blank into a tube furnace, raise the temperature to 400 °C at a rate of 6 °C / min, and then increase the temperature to 1400-1400 at a rate of 9 °C / min 1500°C, keep it warm for 1h, and cool to room temperature with the furnace to prepare a silicon carbide cera...

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Abstract

The invention belongs to the fields of material science and engineering, and particularly relates to a preparation method of a gradient silicon carbide ceramic membrane for water purification. The method comprises the following steps: (1) preparing a silicon carbide ceramic support body; (2) preparing a silicon carbide intermediate layer; and (3) preparing a silicon carbide film, and finally preparing the gradient silicon carbide ceramic membrane for the water purification. The method has the beneficial effects that the prepared silicon carbide ceramic membrane material is high in communicating porosity, high in strength, high in pure water flux, and high in strong acid and alkali resistance; the pore distribution is in a gradient shape, different levels of connection surface are high in bonding strength, the method is simple and convenient to operate, and the gradient silicon carbide ceramic membrane is high in yield. According to the prepared gradient silicon carbide ceramic membrane material for water purification, the breaking strength is greater than 30MPa, the pure water flux is greater than 5m<3>/(m<2>h), and the range tolerance of the pH value is 0-14.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and in particular relates to a preparation method of a gradient silicon carbide ceramic membrane for water purification. Background technique [0002] With the rapid development of my country's economy, the amount of water treatment in industrial production and daily life continues to increase. Taking water pollution as an example, 77% of the sewage in our country is directly discharged without treatment, and 46.7% of the rivers are polluted, which has brought great harm to people's health. In the field of water treatment, membrane materials have become a key component in the process of fluid separation, concentration and purification. Compared with organic membranes, inorganic ceramic membranes have many advantages such as high mechanical strength, resistance to organic solvents, wear resistance, anti-microbial erosion, anti-chemical erosion, no deformation of membrane pores, str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D67/00B01D71/02C02F1/44
Inventor 徐慢沈凡曹宏石和彬陈常连季家友王树林薛俊安子博赵静王亮祝云
Owner 湖北迪洁膜科技有限责任公司
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