The Guxin Pegmatite‑Specific Color Sorter is an AI‑powered multispectral sorting system designed for pegmatite‑type quartz and lithium ores. It addresses four key challenges: the separation of quartz–feldspar–mica intergrowths, the removal of trace impurities, the purification of high‑purity feedstock, and the pre‑sorting and waste rejection of lithium ores. The machine accommodates both dry and wet processing conditions and handles a full particle‑size range from 0.1 to 8 cm, making it widely applicable in four major sectors: photovoltaic‑grade high‑purity quartz, semiconductor crucibles, lithium ore pre‑sorting, and premium feldspar powder. The Guxin Pegmatite‑Specific Sorter serves as the core equipment for purifying photovoltaic‑grade high‑purity quartz and as an expert in the comprehensive utilization of pegmatite‑associated minerals. Its AI‑driven multispectral technology enables precise separation of quartz, feldspar, and mica, with dry‑and‑wet operation for particles larger than 1 cm and full size‑range coverage. It reduces costs, boosts efficiency, enhances product value, and meets the high‑end requirements of pegmatite mines both domestically and internationally.

I. Application Scenarios

(1) Core Scenario: Purification of Pegmatitic Quartz Ore  
1. Rough sorting of pegmatite raw ore (3–8 cm)  
Raw material: Primary ore mined from pegmatite veins, containing transparent or translucent quartz, white or flesh‑red feldspar, black or white mica, iron‑bearing impurities, and gangue minerals, mostly in the form of intergrowths.  
Sorting objectives: Separate high-purity quartz blocks (≥99.5% purity) free of feldspar, mica, and yellow skin/black spots; separate feldspar blocks (potassium/sodium feldspar) with a whiteness index ≥90% for use in ceramics and glass; remove mica, iron-bearing impurities, weathered layers, and waste rock.  
Value: High-purity quartz—directly supplied for photovoltaic glass, semiconductor crucibles, and high-purity quartz sand—delivers a 5–10x increase in value; feldspar—used in premium ceramic glazes and glass fluxes—commands a premium of 30% or more; waste rock—pre‑sorted to eliminate low‑grade material—reduces subsequent grinding and acid‑leaching costs by 40% or more.  
Particle size/capacity: 3–8 cm, with a throughput of 20–50 tons per hour; suitable for direct screening following coarse crushing in open-pit or underground mines.  
2. Selected pegmatite with medium to small grain size (0.1–3 cm, interlayer ore/interlayer black)  
Raw material: Coarsely crushed medium-sized particles; abundant quartz–feldspar intergrowths; finely disseminated mica flakes; trace iron and manganese staining; difficult to identify manually.  
Core challenge: Quartz and feldspar are extremely similar in color—both white or off-white—while mica occurs in thin flakes, and impurities are on the micrometer scale, making them difficult to distinguish with conventional color sorters.  
Gu Xin’s solution: multispectral imaging combined with AI‑based texture recognition to detect refractive index, gloss, and microscopic textural variations, enabling precise separation. For pure quartz, mica flakes smaller than 0.5 cm, needle‑like black spots, and yellow skin are removed, achieving a purity of ≥99.9%; for pure feldspar, whiteness remains stable at ≥92%, with low iron content (Fe₂O₃ ≤ 0.1%). Intergrown aggregates are collected separately and returned for re‑crushing and re‑sorting.  
Value: Produces high-purity quartz sand feedstock (4–120 mesh) directly, eliminating the conventional multi‑stage process of “acid leaching → magnetic separation → flotation,” thereby shortening the process by 50% and reducing reagent and water consumption by 60%.  
3. Purification of pegmatite fine sand (4–120 mesh, high-purity quartz sand)  
Raw materials: Medium‑fine crushed quartz sand, containing feldspar fine powder, mica fragments, iron‑stained particles, and gangue micropowder.  
Objective: Purification to photovoltaic grade (SiO₂ ≥ 99.99%) / semiconductor grade (≥ 99.999%).  
Effects: Removes feldspar, mica, and black inclusions ≥0.1 cm in length; reduces iron, aluminum, calcium, and magnesium impurities to the ppm level; the finished product is directly used for photovoltaic silicon wafer‑cutting abrasives, semiconductor quartz crucibles, and high‑purity quartz glass.  
4. Pre-concentration of pegmatitic lithium ores (spodumene/lithium mica)  
Raw material: granitic pegmatite-type lithium ore, associated with quartz, feldspar, mica, and spodumene/lithium mica.  
Task: Coarse‑grained pre‑selection for waste rejection (1–5 cm), with early separation of:  
Lithium-rich ore: Spodumene and lepidolite are enriched, with grade increasing by 20% or more.  
Waste rock: Primarily quartz and feldspar; directly discarded, reducing the feed to the mill by more than 30%.  
Value: Reduces downstream flotation costs, enhances lithium recovery rates, and is well-suited to the major lithium‑bearing regions of Yunnan, Sichuan, and Jiangxi.  
(2) Extended Application: Comprehensive Utilization of Pegmatite-Associated Minerals  
1. High-end sorting of potassium-sodium feldspar  
Raw material: Feldspar ore from pegmatite, containing quartz, mica, and iron impurities.  
Classification: High‑whiteness feldspar—whiteness ≥ 93%, Fe₂O₃ ≤ 0.08%; used in high‑end ceramic glazes and optical glass; medium‑whiteness feldspar—whiteness 88%–92%; used in architectural ceramics and glass fibers; low‑iron feldspar—exclusively for electronic ceramics and enamel.  
2. Fine-scale separation of mica (white mica/black mica)  
Raw material: Mica flakes from pegmatite, intermixed with quartz and feldspar fragments.  
Sorting: Separate high-purity muscovite (an insulating material) from phlogopite (a construction‑grade filler), thereby increasing the added value of mica.  
3. Sorting of Colored/Unique Pegmatites (Quartz/Jade)  
Raw material: Pegmatite containing rock crystal, citrine, amethyst, and chalcedony.  
Applications: Removing impurities, purifying ornamental stones, raw materials for crafts, and gem-quality crystals.  
( Three ), Alignment with operating conditions and core pain points  
Typical operating conditions  
Environment: Open-pit mines and factory buildings, high dust levels, humid conditions, materials containing mud, 24-hour continuous operation;  
Material: Similar in color (quartz/feldspar), abundant intergrowths, finely dispersed impurities, irregular morphology, and high hardness (Mohs scale of 7).  
Particle size coverage: dry separation from 16 mesh to 5 cm, wet separation from 0.8 to 5 cm; three‑stage mixed separation requires no pre‑classification.  
Addressing core pain points  
Manual sorting is challenging: it is inefficient (0.5 tons per person per day), costly, and lacks precision. AI-based color sorting boosts efficiency by a factor of 20 while reducing costs by 90%.  
Conventional equipment lacks sufficient precision: standard color sorters struggle to distinguish between quartz and feldspar and may miss mica. Guxin’s multispectral technology combined with AI can detect impurities at the micrometer level, achieving a sorting accuracy of ≥99.9%.  
Long process and high costs: By replacing the “pickling → magnetic separation → flotation” sequence, the process is shortened, and reagent, water, and energy consumption are reduced.  
Low product value-added: After sorting, high-purity quartz and premium feldspar command substantial price premiums, with a payback period of 6 to 12 months.  
(4) Core Customers  
High-purity quartz enterprise: photovoltaic glass, semiconductor crucibles, and high-purity quartz sand processing plant;  
Lithium mining companies: Pegmatitic spodumene/lithiophyllite ores require pre-concentration to discard waste.  
Feldspar/Mica Processing Plant: A leading supplier of raw materials for high-end ceramics, glass, and insulating materials; overseas customers include India, Southeast Asia, Africa, and other countries rich in pegmatite resources.

II. Technical Parameters

Note: The above yields are based on a particle size of 1–5 cm (including 5% impurities).

III. Technical Advantages

1. Full particle size coverage: Dry separation: 16 mesh to 5 cm; wet separation: 8 mm to 5 cm; from fine quartz sand to small particles to medium-sized particles—all handled in a single machine.  
2. AI + Multispectral: 54-megapixel CCD, multispectral imaging, and AI deep learning enable the detection of micron‑level color differences, textures, gloss, and intergrowths; it delivers stable identification of mica and black spots down to 0.5 mm, with a sorting accuracy of ≥99.9%.  
3. Strong mixed sorting: Supports mixed sorting across width ranges of 0.1–1 cm, 0.5–5 cm, and 3–8 cm; enables the co‑sorting of pegmatite interlayers, black inclusions, and intergrown mineral aggregates, thereby reducing the need for crushing and screening equipment.  
4. Extremely low output: Dual‑layer tracked free‑fall material discharge ensures stable material orientation; the high‑speed spray valve delivers a response time of ≤1 ms, with a waste‑material carry‑over rate of ≤2%. Compared to conventional machines, it reduces waste of high‑purity quartz by 3–5%, accelerating payback.  
5. Fully compatible with all operating conditions: Dual dry/wet operation, one-button switching; temperature range: -25°C to +45°C; suitable for high-dust and high-humidity environments; supports 24-hour continuous operation.  
6. Multi-purpose in one device: Suitable for four general-purpose applications: sorting high-purity quartz, potassium/sodium feldspar,白云母 (muscovite), spodumene, waste rock, photovoltaic quartz sand, premium feldspar powder, pre‑concentration of lithium ore, and advanced mica refining.  
7. Lifespan of 20 years or more: Thickened frame and wear-resistant tracks ensure no deformation or deviation under high‑intensity mining conditions, delivering excellent long-term stability and maintaining accuracy even after many years.  
8. Low operational maintenance costs: Self-cleaning system reduces manual cleaning; few wear parts and a modular design allow for replacement in just half an hour; post-warranty maintenance costs are more than 40% lower than those of comparable models.  
9. High yield, low energy consumption: Large chunks (3–5 cm): Total electricity consumption ≤ 2.5 kWh/ton, more than 50% more energy-efficient than conventional machines.  
10. Global After-Sales Service: Quick to learn, robust support: intuitive touchscreen interface; requires only a half-hour training session to get started—no specialized technical expertise needed. Plus, remote diagnostics and a global network of service centers.

IV. Color Sorting Site