{"id":21167,"date":"2026-07-29T08:41:20","date_gmt":"2026-07-29T06:41:20","guid":{"rendered":"https:\/\/alztec.com\/?page_id=21167"},"modified":"2026-07-29T08:42:31","modified_gmt":"2026-07-29T06:42:31","slug":"offcut-recycling","status":"publish","type":"page","link":"https:\/\/alztec.com\/en\/silicon-processing\/offcut-recycling\/","title":{"rendered":"Offcut Recycling"},"content":{"rendered":"[vc_row type=”in_container” full_screen_row_position=”middle” column_margin=”default” column_direction=”default” column_direction_tablet=”default” column_direction_phone=”default” scene_position=”center” top_padding=”130″ top_padding_tablet=”80″ text_color=”dark” text_align=”left” row_border_radius=”none” row_border_radius_applies=”bg” row_position_desktop=”default” row_position_tablet=”inherit” row_position_phone=”inherit” overflow=”visible” overlay_strength=”0.3″ gradient_direction=”left_to_right” shape_divider_position=”bottom” bg_image_animation=”none” shape_type=”” gradient_type=”default”][vc_column column_padding=”padding-1-percent” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”left-right” flex_gap_desktop=”10px” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” column_position=”default” advanced_gradient_angle=”0″ gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/1″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_style=”solid” gradient_type=”default”][vc_row_inner equal_height=”yes” column_margin=”20px” column_direction=”default” column_direction_tablet=”default” column_direction_phone=”default” text_align=”left” row_position=”default” row_position_tablet=”inherit” row_position_phone=”inherit” overflow=”visible” pointer_events=”all”][vc_column_inner column_padding=”padding-2-percent” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”all” flex_gap_desktop=”10px” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color=”#5488c7″ background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” overflow=”visible” gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/3″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_style=”solid”][vc_column_text css_animation=”bottom-to-top” css=”.vc_custom_1785304562430{padding-top: 5% !important;}” text_direction=”default”]\n

Silicon Offcut Recycling<\/span><\/h1>\n[\/vc_column_text][vc_column_text css_animation=”bottom-to-top” css=”.vc_custom_1785307347994{padding-top: 5% !important;}” text_direction=”default”]\n

The ALZTEC OFFCUT RECYCLING SYSTEM is a highly efficient solution for recovering and reusing valuable silicon from ingot and wafer production. The system processes all common types of silicon offcuts, including wings, tops & tails, ingot pieces, and bricks, helping manufacturers improve material utilization and reduce production costs.<\/span><\/p>\n[\/vc_column_text][vc_column_text css_animation=”bottom-to-top” css=”.vc_custom_1785305602287{padding-top: 5% !important;}” text_direction=”default”]\n

With a scalable capacity ranging from 5 GW to 20 GW, every recycling plant is individually engineered to fit the customer’s production environment. Automated material handling and intelligent process control maximize silicon recovery while minimizing labor requirements, resulting in higher productivity, increased sustainability, and significant annual cost savings.<\/span><\/p>\n[\/vc_column_text][\/vc_column_inner][vc_column_inner column_padding=”no-extra-padding” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”all” flex_gap_desktop=”10px” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” overflow=”visible” gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”2\/3″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_color=”#000000″ column_border_style=”solid”][nectar_video_lightbox link_style=”play_button_2″ nectar_play_button_color=”Extra-Color-3″ image_url=”21124″ hover_effect=”defaut” box_shadow=”none” border_radius=”none” play_button_size=”larger” video_url=”https:\/\/www.youtube-nocookie.com\/embed\/oKTu2v7r8OE” image_size=”full” link_screen_reader=”to video Silicon Offcut Recycling”][\/vc_column_inner][\/vc_row_inner][vc_row_inner equal_height=”yes” column_margin=”20px” column_direction=”default” column_direction_tablet=”default” column_direction_phone=”default” text_align=”left” row_position=”default” row_position_tablet=”inherit” row_position_phone=”inherit” overflow=”visible” pointer_events=”all” css=”.vc_custom_1785306482188{padding-top: 2% !important;}”][vc_column_inner column_padding=”no-extra-padding” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”all” flex_gap_desktop=”10px” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” overflow=”visible” gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/3″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_style=”solid”][vc_column_text css=”.vc_custom_1785306629517{padding-top: 5% !important;padding-right: 5% !important;padding-bottom: 5% !important;padding-left: 5% !important;}” text_direction=”default”]The Silicon Offcut Recycling Process<\/span><\/p>\n

The silicon recycling process begins with manual or robotic loading of silicon offcuts into etching baskets. An integrated pre-cleaning system removes sawing slurry using rotating brushes and high-pressure water jets, preparing the material for the subsequent chemical treatment.<\/span>
\n
\nThe silicon is then etched with an optimized HF\/HNO\u2083 acid mixture, removing approximately 30 \u03bcm from the surface and eliminating metallic contamination. Surface metal concentrations can be reduced to around 100 parts per trillion (ppt), providing the ultra-clean silicon required for manufacturing high-efficiency solar cells and modules. Nitric exhaust gases are safely treated in an integrated scrubber, while ALZTEC also offers complete chemical supply systems. As an alternative, an alkaline etching process with reduced utility costs is available.<\/span>
\n
\nAfter cleaning, a robot feeds the material into the ALZTEC jaw crusher. Corrugated tungsten carbide jaws ensure highly efficient crushing while generating only minimal fines. Polyurethane-lined vibration conveyors transport the material through the patented sorting system.<\/span>
\n
\nFirst, an air sorter gently removes fine particles. The fines are further classified by polyurethane-lined vibration screens before reusable silicon is returned to the desired size fraction. The main material stream passes through a camera-controlled optical sorter that removes oversized particles and produces a precise target particle size for reliable crucible charging.<\/span>
\n<\/span>[\/vc_column_text][\/vc_column_inner][vc_column_inner column_padding=”no-extra-padding” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”all” flex_gap_desktop=”10px” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” overflow=”visible” gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/3″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_style=”solid”][vc_column_text css=”.vc_custom_1785306682236{padding-top: 5% !important;padding-right: 5% !important;padding-bottom: 5% !important;padding-left: 5% !important;}” text_direction=”default”]From Recycling to Crystal Growth<\/span><\/p>\n

The sorted silicon is stored in polyurethane-lined boxes, providing buffer capacity for up to three days and ensuring continuous production. Covered storage boxes allow installation outside cleanroom environments. An integrated material tracking system automatically delivers the required silicon batches at exactly the right time.<\/span>
\n
\nFor crystal growth, polyurethane-lined buffer conveyors separate different silicon resistivities. Automated dosing systems add dopants according to individual recipes before robots fill internal feeder tubes or external feeder hoppers. Automated Guided Vehicles (AGVs) transport the filled feeders directly to the single crystal pullers, creating a fully automated material flow from recycling to crystal growth.
\n
\nCombined with the ALZTEC Crucible Charging System, the Offcut Recycling System forms a complete, intelligent recycling solution for modern silicon production facilities. Advanced processing technologies and intelligent automation significantly increase silicon recovery in the target size fraction while reducing raw material losses and saving millions of euros every year.<\/span>
\n
\nSince 2002, ALZTEC has supplied more than 25 major silicon processing plants on three continents. We deliver reliable turnkey solutions with lifetime service support, helping manufacturers improve material utilization, increase sustainability, and maximize profitability.<\/span><\/span>[\/vc_column_text][\/vc_column_inner][vc_column_inner column_padding=”no-extra-padding” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”all” flex_gap_desktop=”10px” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” overflow=”visible” gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/3″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_style=”solid”][vc_column_text css=”.vc_custom_1785306695745{padding-top: 5% !important;padding-right: 5% !important;padding-bottom: 5% !important;padding-left: 5% !important;}” text_direction=”default”]Key Facts<\/span><\/p>\n

\u2714 Recovery and reuse of valuable silicon offcuts
\n\u2714 Processing of wings, tops & tails, ingot pieces and bricks
\n\u2714 Scalable plant capacity from 5 GW to 20 GW
\n\u2714 Customized layouts for existing production facilities
\n\u2714 Acid or alkaline etching technology
\n\u2714 Patented crushing and sorting technology with minimal fines
\n\u2714 Optical sorting for precise target particle size
\n\u2714 Fully automated material handling with robots and AGVs
\n\u2714 Automated dopant dosing and crucible charging
\n\u2714 Increased silicon yield with annual savings worth millions of euros
\n\u2714 Turnkey systems with lifetime service support[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row type=”in_container” full_screen_row_position=”middle” column_margin=”default” column_direction=”default” column_direction_tablet=”default” column_direction_phone=”default” scene_position=”center” text_color=”dark” text_align=”left” row_border_radius=”none” row_border_radius_applies=”bg” row_position_desktop=”default” row_position_tablet=”inherit” row_position_phone=”inherit” overflow=”visible” overlay_strength=”0.3″ gradient_direction=”left_to_right” shape_divider_position=”bottom” bg_image_animation=”none” shape_type=”” gradient_type=”default”][vc_column column_padding=”padding-1-percent” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”left-right” flex_gap_desktop=”10px” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” column_position=”default” advanced_gradient_angle=”0″ gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/1″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_style=”solid” gradient_type=”default”][vc_row_inner equal_height=”yes” content_placement=”middle” column_margin=”20px” column_direction=”default” column_direction_tablet=”default” column_direction_phone=”default” text_align=”left” row_position=”default” row_position_tablet=”inherit” row_position_phone=”inherit” overflow=”visible” pointer_events=”all”][vc_column_inner column_padding=”padding-2-percent” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”all” flex_gap_desktop=”10px” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” overflow=”visible” gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/1″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”1px” column_border_color=”#000000″ column_border_style=”solid” column_padding_type=”default” gradient_type=”default”][vc_column_text css=”” text_direction=”default”]\n

Videos<\/h3>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner equal_height=”yes” content_placement=”middle” column_margin=”20px” column_direction=”default” column_direction_tablet=”default” column_direction_phone=”default” text_align=”left” row_position=”default” row_position_tablet=”inherit” row_position_phone=”inherit” overflow=”visible” pointer_events=”all”][vc_column_inner column_padding=”no-extra-padding” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”all” flex_gap_desktop=”10px” column_element_direction_desktop=”default” column_element_spacing=”10px” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” overflow=”visible” gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/3″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_style=”solid” column_padding_type=”default” gradient_type=”default”][nectar_video_lightbox link_style=”play_button_2″ nectar_play_button_color=”Extra-Color-3″ image_url=”20077″ hover_effect=”defaut” box_shadow=”none” border_radius=”none” play_button_size=”larger” video_url=”https:\/\/www.youtube-nocookie.com\/embed\/YNh4skOk278″ link_screen_reader=”to video Silicon Processing”][vc_column_text css=”” text_direction=”default”]Video Silicon Processing<\/strong>[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][divider line_type=”Full Width Line” line_thickness=”1″ divider_color=”black” custom_height=”50″][nectar_btn size=”jumbo” button_style=”regular” button_color_2=”Accent-Color” icon_family=”default_arrow” text=”back to Silicon Processing” url=”\/en\/silicon-processing\/” aria_label_text=”back to Silicon Processing overview”][\/vc_column][\/vc_row][vc_row type=”in_container” full_screen_row_position=”middle” column_margin=”default” column_direction=”default” column_direction_tablet=”default” column_direction_phone=”default” scene_position=”center” text_color=”dark” text_align=”left” row_border_radius=”none” row_border_radius_applies=”bg” row_position_desktop=”default” row_position_tablet=”inherit” row_position_phone=”inherit” overflow=”visible” overlay_strength=”0.3″ gradient_direction=”left_to_right” shape_divider_position=”bottom” bg_image_animation=”none”][vc_column column_padding=”no-extra-padding” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”all” flex_gap_desktop=”10px” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” column_position=”default” gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/1″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_style=”solid”][nectar_global_section id=”20393″][\/vc_column][\/vc_row]\n","protected":false},"excerpt":{"rendered":"

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