Silica Powder Processing Line

Silica Powder Processing Line

Micronized silica powder is a critical functional filler widely used in coatings, rubber, plastics, adhesives and precision electronics, where tight particle size distribution, consistent grain morphology and high purity are core requirements for end-product performance. At the heart of premium silica powder production lies the closed-circuit combination of ball milling and air classification — a proven process that balances grinding efficiency, sizing precision and product consistency.

Guote delivers full turnkey EPC silica powder processing lines centered on optimized ball mill and air classifier circuits. Backed by our in-house process engineering team, we tailor each system to match target fineness, capacity and purity specifications, ensuring stable production of high-quality micronized silica with flexible grade adaptability. All lines are engineered for continuous operation, low maintenance and reliable long-term performance.

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PROCESS DESCRIPTION

01

Sand Making & Pre‑Screening

Quartz ore with particle size ≤40 mm is fed by wheel loader. Material is evenly fed via vibrating feeder into sand‑making machine. Discharged material goes to sizing screen to separate intermediate products of 26‑mesh and 120‑mesh. Oversize fraction coarser than 6‑mesh is circulated back to sand‑making machine for re‑grinding, forming closed‑loop crushing‑screening circuit to produce qualified coarse‑sand feedstock for downstream processing.
02

Dry Magnetic Separation & Ball‑Milling

Qualified coarse sand after screening is elevated by bucket elevator and buffered in surge hopper, then fed into dry magnetic separator to remove magnetic minerals and ferrous impurities. Pre‑removal of iron at coarse‑sand stage reduces iron contamination during milling and protects grinding equipment. De‑ironed material is fed at stable rate via weighing belt feeder into horizontal ball mill. Equipped with wear‑resistant low‑contamination liners and grinding media, the mill grinds coarse sand into fine silica powder.
03

Closed‑Circuit Air Classification

Ground powder from ball mill enters classification system composed of multi‑wheel centrifugal air classifier, cyclone collectors, pulse‑jet baghouse dust collectors and high‑pressure induced‑draft fan. Qualified fine powder is carried by air stream and collected by cyclone and baghouse as final product. Oversize coarse particles are conveyed back to ball mill for re‑grinding. This closed‑circuit setup prevents over‑grinding and delivers narrow, consistent particle‑size distribution with well‑controlled D10, D50 and D90 values.
04

Full‑System Negative‑Pressure Dust Control

The whole production line (sand‑making, magnetic separation, ball‑milling and classification) runs under fully enclosed negative‑pressure condition with central pulse dust‑collection system. All material transfer happens inside sealed equipment and pipelines. Exhaust gas from induced‑draft fan is clean and compliant with environmental standards. Zero dust emission is achieved, meanwhile secondary contamination to final silica powder is minimized.

PROCESSING FLOW

Core Advantages & Performance Outcomes

-Precision closed-circuit sizing: Ball mill paired with air classifier in closed loop delivers tight particle size distribution with accurate D-value control, meeting the exacting specifications of high-end industrial formulations.

-Uniform grain morphology: Ball mill grinding produces well-rounded, evenly shaped particles with excellent dispersibility, ideal for consistent performance in coating, rubber and polymer applications.

-Flexible & adjustable fineness: Easily adjustable operating parameters enable fineness tuning across a wide range, with the ability to produce multiple product grades without major equipment changes.

-Full turnkey EPC delivery: End-to-end accountability covering feedstock testing, process design, equipment manufacturing, installation, commissioning, operator training and ongoing technical support.

-Clean & efficient operation: Fully enclosed processing with pulse-jet dust collection achieves dust-free production, while optimized circuit design minimizes energy consumption per ton of product.

Target Applications

Architectural & industrial coatings, rubber compounding, plastic fillers, adhesives & sealants, electronic encapsulants, refractory materials, foundry molds, specialty industrial chemicals.

SUCCESSFUL CASE

5 Million TPY Iron Ore Beneficiation Plant Project in Xinjiang

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