Polysilicon sewage case
The polysilicon sewage treatment project uses a two-phase centrifugal dehydrator
Centrifuge is widely used in biomedicine, petrochemical industry, agriculture, food hygiene and other fields. It uses the difference of precipitation velocity of different substances in the centrifugal force field to realize the analysis and separation of samples.
Since its inception, the centrifuge has gone through the changes of low speed, adjustment and overspeed. Its progress is mainly reflected in two aspects: centrifugal equipment and centrifugal technology, which complement each other.
Speed regulation system is the core part of horizontal screw centrifuge, which is composed of control, power drive and motor. It mainly controls the speed of motor. In the development process of centrifuges, DC speed regulation is indispensable. Its main characteristics are good starting and braking, wide speed regulation range, simple structure, low cost and mature theory and practice. Therefore, it was widely used in centrifuges before the 1980s. Therefore, it was widely used in centrifuges before the 1980s and is still being applied and improved, Such as improving the wear resistance of copper head and carbon brush of DC motor to prolong the service life of motor and the replacement cycle of carbon brush.
Polysilicon is the key basic material for manufacturing integrated circuits and photovoltaic solar cells. It is an important cornerstone for the development of information industry and photovoltaic new energy industry. However, in the production process, polysilicon production enterprises produce a large number of industrial wastewater with complex components. If it can not be well treated, it is bound to seriously pollute the water body and endanger the environment. Therefore, how to treat production wastewater has become a major issue that must be solved in the environmental treatment of polysilicon production enterprises.
In the process of polysilicon production, it is necessary to properly corrode the silicon containing raw materials with strong acid, so a large amount of acidic wastewater will be produced in the production process. According to the analysis of water quality, the wastewater of polysilicon production enterprises is divided into three categories: fluorine-containing acidic wastewater, other production wastewater and domestic wastewater. Fluorine containing acidic wastewater mainly comes from the soaking section and cleaning section of polysilicon raw materials in the washing workshop and the spraying wastewater discharged from the spraying tower in acid mist treatment. According to the concentration of fluorine ion, it is divided into high fluorine wastewater and low fluorine wastewater.
Strengthen the separation performance of polysilicon sewage treatment two-phase centrifugal dehydrator, including increasing the rotating speed of the drum; Add new driving force in the process of centrifugal separation; Speed up the slag pushing speed; Increase the length of the drum to prolong the centrifugal sedimentation separation time, etc.
The development of large centrifugal separators is mainly to increase the diameter of the drum and adopt double-sided drum to improve the processing capacity, so as to reduce the equipment investment, energy consumption and maintenance cost of handling unit volume materials.
Machine installation, commissioning on the customer's site
