I. Why Choose JC Electromagnetic Iron Remover for Polysilicon Purification?
As the core raw material of PV cells, the purity of polysilicon directly determines the photoelectric conversion efficiency of PV modules. Photovoltaic-grade polysilicon requires a total metal impurity content of ≤1ppb, among which iron impurities must be controlled below 0.1ppb. During production, from the reduction of quartz sand, crushing, to the cleaning of silicon material and pre-treatment before ingot casting, polysilicon is prone to introducing ferromagnetic impurities due to the wear of equipment (such as stainless steel reactors and grinders) and the corrosion of conveying pipelines. These impurities will form "recombination centers" that trap photogenerated carriers, leading to a decrease in photoelectric conversion efficiency and even causing hidden cracks in battery cells.
The JC Electromagnetic Iron Remover has made targeted breakthroughs to meet the needs of polysilicon purification: First, it adopts the "high magnetic permeability medium + pulse magnetizing technology", which can generate a high-gradient magnetic field of 3500-45000 Gauss. This enables it to adsorb ultra-fine iron impurities with a particle size as small as 0.005mm, meeting the strict standards for iron content in photovoltaic-grade polysilicon. Second, the parts of the equipment that come into contact with materials are made of 316L stainless steel (resistant to strong acid corrosion), which is suitable for the iron removal scenario of silicon material after cleaning with hydrofluoric acid and nitric acid in polysilicon production, avoiding material contamination. Third, it supports the dual-form processing of "dry polysilicon powder + silicon powder slurry" and can be seamlessly integrated into the key processes after polysilicon crushing and before ingot casting, preventing secondary contamination by impurities and ensuring the continuity of purification.
II. Improved Effects After Application
Before introducing the JC Electromagnetic Iron Remover, a photovoltaic-grade polysilicon production enterprise suffered from fluctuating photoelectric conversion efficiency of polysilicon (average efficiency ≤23.5%) due to excessive iron impurities. Moreover, manual screening of silicon material was required every 4 hours, resulting in a daily labor cost of over 1,200 yuan for a single production line. After applying the JC Electromagnetic Iron Remover, three core improvements were achieved:
- Dual Improvement of Purity and Efficiency: The iron content of polysilicon is stably controlled within 0.08ppb, and the photoelectric conversion efficiency is increased to over 24.2%, which meets the raw material requirements of TOPCon and HJT high-efficiency battery cells, and the product premium rate is increased by 8%.
- Optimization of Production Efficiency: Automatic iron removal replaces manual screening, saving 1,200 yuan in daily labor costs for a single production line. The equipment operates continuously without failure for more than 4,000 hours, and the shutdown maintenance rate is reduced by 90%.
- Reduction of Cost Loss: It reduces the amount of silicon material scrapped due to iron impurities, saving approximately 35,000 yuan in monthly polysilicon raw material loss costs. At the same time, it avoids damage to the heating elements of the ingot furnace caused by iron impurities, extending the service life of the equipment by 3-5 years.
III. Advantages and Features
(1) Ultra-Clean Iron Removal and Corrosion Resistance Adaptation
In response to the dual characteristics of "high purity requirements + strong corrosive environment" in polysilicon production, the JC Electromagnetic Iron Remover adopts a "fully enclosed magnetic circuit design": the magnet assembly is sealed in a 316L stainless steel cavity to prevent corrosion of the magnet by corrosive gases such as hydrofluoric acid and chlorine gas. At the same time, it is equipped with an "ultrasonic cleaning function" that can regularly clean the silicon powder adsorbed on the surface of the magnetic medium, preventing silicon powder from wrapping iron impurities and affecting the iron removal effect, thus ensuring long-term stability of iron removal accuracy.
(2) Low Interference and Intelligent Control
First, it adopts a "low electromagnetic radiation design". Through a shielding cover (with a permalloy magnetic conductive layer), the electromagnetic radiation of the equipment is controlled within ≤5μT, avoiding interference with the detection accuracy of precision testing instruments (such as ICP-MS metal analyzers) in polysilicon production. Second, it is equipped with an "AI intelligent monitoring system" that can real-time monitor parameters such as magnetic field strength, silicon material processing capacity, and equipment temperature. When the adsorption amount of iron impurities reaches the threshold, it automatically triggers slag discharge. At the same time, it generates a "Daily Report on Iron Removal Effect", which facilitates enterprises to trace the purification process and meets the requirements of the PV industry quality management system.
IV. Product Attribute Table
V. QA
Q1: When the JC Electromagnetic Iron Remover processes polysilicon, will it adsorb effective components in the silicon material (such as monocrystalline silicon particles and silane derivatives)?
A1: No. Polysilicon (Si) is a non-magnetic substance, and its monocrystalline silicon particles and silane derivatives are also non-magnetic, so they will not be adsorbed by the equipment's magnetic field. The equipment only exerts strong adsorption force on ferromagnetic impurities such as iron, nickel, and cobalt, which can ensure no loss of effective components in the silicon material while achieving ultra-clean iron removal.
Q2: Polysilicon production requires strict control of dust pollution. Will the JC Electromagnetic Iron Remover generate silicon powder dust?
A2: No. The equipment adopts a "sealed feeding + negative pressure discharging" design. The feeding port is equipped with a silicone sealing ring (to prevent air leakage), and the discharging port is connected to a negative pressure pipeline. This can control silicon powder dust within ≤0.1mg/m³, which meets the dust standard of clean workshops (Class 10,000) in the PV industry and avoids secondary pollution.
Q3: The existing polysilicon production line is already equipped with traditional iron removal equipment. Does replacing it with the JC Electromagnetic Iron Remover require reconstructing the production line?
A3: No reconstruction is needed. The JC Electromagnetic Iron Remover adopts a "modular replacement design". The size of the inlet and outlet ports and the installation height can be customized according to the parameters of the existing production line, and it is compatible with industry-standard DN50-DN400 pipeline interfaces. A professional technical team will provide integrated services of "old equipment removal + new equipment installation + commissioning", with a replacement cycle of only 1-2 days, which has minimal impact on the normal production of the production line.
