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Posted by Admin on August, 26, 2026
A practical reference for buyers of Quartz Lumps for silicon metal, ferrosilicon, glass and foundry use — where global supply comes from, which ports to plan for in Vietnam and Taiwan, indicative pricing by grade and lump size, and available packing formats.
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What Are Quartz Lumps?
Quartz lumps are unground or coarsely crushed pieces of natural quartz rock, sorted by size and purity rather than ground into powder. They are the raw or semi-processed form of quartz used directly in high-temperature industrial processes — most significantly silicon metal and ferrosilicon smelting — as well as glass batching, foundry work and construction aggregate, where the coarse form is exactly what the process requires.
Unlike quartz powder, which is valued for its fineness and reactivity, quartz lumps are valued for purity at scale and consistent lump size, since smelting furnaces and glass furnaces are fed continuously and depend on predictable, evenly sized raw material.
Global Quartz Lumps Exporter Landscape
Quartz lump supply is concentrated in countries with large-scale, high-purity quartz deposits and the mining infrastructure to sort and size material at volume. India, particularly Rajasthan and parts of Andhra Pradesh, is a significant global supplier, alongside China, Brazil, Norway and South Africa — the last two known especially for ultra-high-purity quartz used in silicon metal and semiconductor-adjacent applications. Buyers sourcing standard industrial and glass-grade lumps typically find India and China the most cost-competitive origins, while Norway and Brazil are more commonly referenced for premium, ultra-high-purity requirements.
Grades & Lump Sizes
| LUMP SIZE | TYPICAL SIO2 | COMMON USE |
|---|---|---|
| 0-5 mm (chips/grits) | 97% - 99% | Terrazzo, decorative aggregate, filler applications |
| 5-20 mm | 98% - 99.5% | Foundry blends, water filtration media, general industrial use |
| 20-40 mm | 98.5% - 99.5% | Glass batch feedstock, standard smelting furnace charge |
| 40-80 mm | 99%+ (low iron for smelting grade) | Silicon metal and ferrosilicon smelting furnace charge |
For silicon metal and ferrosilicon applications, buyers typically specify tight limits on Fe2O3, Al2O3 and phosphorus content in addition to SiO2, since these impurities transfer into the smelted metal and affect its grade.
Industrial Applications
Silicon Metal Smelting
High-purity, low-iron lumps used as the primary silica charge in electric arc furnace silicon metal production.
Ferrosilicon Production
Similar furnace-grade lumps used in ferrosilicon alloy manufacturing for the steel industry.
Glass Manufacturing
Coarser, consistently sized lumps used as part of the raw batch feed in glass furnaces.
Foundry & Filtration
Sized lumps used in foundry sand blends and as water filtration and pool filter media.
Terrazzo & Landscaping
Decorative-grade lumps and chips used as aggregate in terrazzo flooring and landscaping applications.
Ceramic Raw Material
Lumps destined for further grinding into quartz powder at the buyer's own facility, where the buyer prefers to control the final grind.
Destination Ports in Vietnam
Cai Mep-Thi Vai / Cat Lai (Ho Chi Minh City area)
Main gateway for southern Vietnam's industrial belt, including buyers near Binh Duong and Dong Nai. Deep-water berths at Cai Mep-Thi Vai support large bulk vessels, relevant for high-volume lump shipments.
Hai Phong Port
Vietnam's principal northern port, serving Hanoi-area glass and smelting facilities, with ongoing capacity expansion at the Lach Huyen terminal.
Da Nang Port
Serves central Vietnam manufacturers, positioned along the East-West Economic Corridor connecting to Laos and Thailand.
Destination Ports in Taiwan
Kaohsiung Port
Taiwan's largest harbor and main hub for bulk cargo, including raw mineral imports feeding southern Taiwan's industrial and glass manufacturing base.
Taichung Port
Alternative routing for buyers based in central Taiwan's manufacturing zones.
Keelung Port
Serves northern Taiwan and the Taipei metropolitan area, handling a meaningful share of regional cargo.
Indicative FOB Pricing by Grade
| GRADE | TYPICAL SPECIFICATION | INDICATIVE FOB RANGE (USD/MT) |
|---|---|---|
| General Industrial Grade | ~97-98% SiO2, mixed lump size | $30 - $50 |
| Glass Batch Grade | 98.5-99% SiO2, 20-40mm sized | $45 - $70 |
| Foundry & Filtration Grade | 98-99.5% SiO2, 5-20mm sized | $40 - $65 |
| Silicon Metal / Ferrosilicon Grade | 99%+ SiO2, low Fe/Al/P, 40-80mm | $65 - $100 |
Lump grades generally carry a lower per-ton price than equivalent-purity powder due to reduced processing, though smelting-grade lumps with tight impurity limits can command a premium over standard industrial lumps. Freight to Vietnam and Taiwan adds to this FOB base, and buyers typically compare FOB against CIF/CFR quotes to assess total landed cost.
Packing Options for Export
Bulk Vessel / Loose Loading
The most cost-efficient format for large-volume smelting and glass-batch buyers, loaded loose into vessel holds or bulk containers.
1-Ton Jumbo Bags
Common for mid-volume buyers with crane or forklift handling, reducing dust and loss compared to fully loose loading.
25-50 kg Bags
Used for smaller trial orders, decorative/landscaping buyers, or destinations without bulk handling infrastructure.
Container Bulk Fill
20ft or 40ft containers filled directly with lumps (liner-bagged or loose), a middle option between full bulk vessel and bagged cargo.
Frequently Asked Questions
What are quartz lumps used for?
Primarily as raw silica feedstock in silicon metal and ferrosilicon smelting, glass batch manufacturing, foundry blends, water filtration media, and decorative aggregate in terrazzo and landscaping.
What is the difference between quartz lumps and quartz powder?
Lumps are unground or coarsely crushed quartz rock used directly in furnaces or as aggregate. Powder is quartz ground finer, typically 100-500 mesh, for ceramics, glazes and fillers.
What purity is required for silicon metal grade lumps?
Typically above 99% SiO2 with low iron, aluminium and phosphorus, since these impurities carry through into the smelted metal.
Which ports in Vietnam and Taiwan accept quartz lumps shipments?
Vietnam: Cai Mep-Thi Vai/Cat Lai (south), Hai Phong (north), Da Nang (central). Taiwan: Kaohsiung (primary), Taichung (central), Keelung (north).
How are quartz lumps packed and shipped?
Loose bulk in vessel holds for large industrial buyers, or 1-ton jumbo bags and 25-50 kg bags for smaller or trial orders, loaded into standard containers.
Get a Quote for Shipment to Vietnam or Taiwan
Share your target grade, lump size and destination port, and we'll come back with FOB and CIF pricing plus a sample for trial testing.
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