Rice Husk Ash Vietnam – High Silica RHA Produced by VinaTap

Rice Husk Ash (RHA) from VinaTap is produced by controlled burning of rice husks to remove lignin and cellulose while preserving a high content of reactive silica. The result is a lightweight, fine ash widely used in steelmaking, concrete, soil stabilization, agriculture and various industrial applications.

Rice husk originally contains approximately cellulose (40–45%), lignin (25–30%), ash (15–20%) and moisture (8–15%). During controlled combustion, carbon is burned off, leaving a silica-rich ash known as Rice Husk Ash (RHA).

⭐ Factory Contact – Bulk Rice Husk Ash

VinaTap Vietnam – Rice Husk Ash & Biochar Manufacturer
WhatsApp / Viber: +84 888 888 609
Email: vinatap@gmail.com
Website: www.vinatap.vn

1. What Is Rice Husk Ash?

In VinaTap’s biomass cogeneration system, rice husk is used as fuel and burned in controlled environment furnaces. Heat from the furnace generates steam, which drives a turbine and generator for rice cooking and milling. After complete combustion of rice husk, the by-product is Rice Husk Ash (RHA) – a fine, silica-rich ash with very low carbon.

VinaTap RHA is:

  • Produced under precise PLC-controlled combustion
  • Stored in silos to maintain consistent quality
  • Environmentally friendly – reusing agricultural waste as biomass fuel
  • Available in large quantities for long-term projects

2. Main Properties of VinaTap Rice Husk Ash

  • Color: Grey to white
  • Carbon: Less than 5% (low-carbon ash)
  • Silica (SiO₂): High content – excellent reactive silica source
  • Density: Very low bulk density, lightweight and free-flowing
  • Structure: Fine, porous particles with excellent insulation behaviour
  • Origin: By-product of biomass cogeneration power plant
  • Environment: Non-hazardous, eco-friendly, reuses agricultural waste

Thanks to these properties, VinaTap RHA is a versatile material for metallurgy, construction, agriculture, filtration and industrial processing.

3. Rice Husk Ash for Steel & Foundry Industry

3.1 Insulation & Tundish Covering Compound

Low-carbon rice husk ash is widely used in steelmaking as a tundish and ladle covering material due to its:

  • High thermal insulation capacity – reduces radiant heat loss
  • Free-flowing, non-hazardous powder – easy and safe to apply
  • Low carbon content – does not contaminate liquid steel
  • Weak sintering and no crust formation – easy removal after casting

3.2 How It Works

During steelmaking, when molten metal is at ~1600°C in the ladle or tundish, a layer of rice husk ash is spread over the metal surface. It forms a 1–2 inch insulating blanket that:

  • Prevents heat loss
  • Reduces oxidation of liquid steel
  • Protects ladle lining

VinaTap rice husk ash is stored in silos, produced under PLC-controlled combustion and supplied in a consistent, stable quality suitable for steel and foundry operations.

4. Rice Husk Ash in Construction & Soil Stabilization

Laboratory studies on soft clays and A-6 soils (AASHTO) show that adding Rice Husk Ash can:

  • Reduce maximum dry density (MDD) and increase optimum moisture content (OMC)
  • Lower liquid limit and plasticity index (PI) when mixed at about 9% RHA
  • Increase California Bearing Ratio (CBR) in both soaked and unsoaked conditions
  • Improve unconfined compressive strength (UCS) after curing

A typical effective stabilization recipe suggested by research is: Soil + 4% Lime + 9% Rice Husk Ash, which can be used for road foundation and base layers.

For deeper layers or higher bearing demands, geosynthetics and woven geotextiles may be combined with RHA-stabilized soil for optimal performance.

5. Rice Husk Ash in Agriculture & Horticulture

5.1 Nutrient Source & Soil Conditioner

Rice husk ash contains beneficial components such as:

  • Potassium (K)
  • Phosphorus (P)
  • Calcium (Ca)
  • Silica (Si)

These elements support:

  • Stronger stems and thicker leaves
  • Improved resistance to pests and diseases
  • Enhanced root development and soil microbiology (worms and beneficial microbes)

5.2 Improving Soil Structure & Moisture

Rice husk ash:

  • Loosens compacted soil and improves aeration
  • Helps retain moisture without waterlogging
  • Decomposes slowly, providing long-term structural benefits

5.3 Combination with Cocopeat & Coir

When combined with coco peat and coir, rice husk ash creates a highly effective organic substrate:

  • Excellent porosity and drainage
  • Good nutrient holding and release
  • Ideal for vegetables, flowers, seedlings and nursery media

VinaTap supplies both Rice Husk Ash and Coco Coir Substrates, making it easy to design complete growing media for farms and landscape projects.

6. Other Industrial Applications of Rice Husk Ash

  • Cement & Concrete: pozzolanic additive to improve strength and durability
  • Insulation Materials: heat and sound insulation boards and plasters
  • Chemical Industry: raw material for dyes, coatings, abrasives and lubricants
  • Rubber & Tire Industry: silica filler improving grip, reducing CO₂ emissions and noise
  • Paper & Artificial Leather: functional filler
  • Sorbent: for treating water polluted with oil and hydrocarbons
  • Catalyst Support: carrier for specialized catalysts and adsorbents
  • Fertilizer & Substrate: blended into organic fertilizers and soilless media

7. Packaging, Logistics & Service

Packaging: VinaTap is flexible and can provide:

  • Jumbo bags (big bags) for bulk industrial customers
  • Custom bag sizes as per client specification

Before ordering, customers can specify preferred packing style so we can calculate exact pricing. Photos of standard packing and loading are available and can be sent via email.

Logistics & Documentation:

  • We can work with your nominated shipping agent or arrange a suitable shipping line
  • All shipping documents and B/L will be sent via DHL after issuance
  • Delivery time is typically about 7 days after receiving deposit or L/C for ready goods
  • Quality and quantity are fully guaranteed

8. FAQ – Rice Husk Ash (RHA)

Q1. What is the difference between rice husk ash and rice husk charcoal?

Rice husk ash is fully burned, low-carbon, high-silica powder mainly used in steel, concrete and soil stabilization. Rice husk charcoal / biochar still contains high carbon and is used more as a fuel and soil carbon amendment.

Q2. Can rice husk ash be used directly in concrete?

Yes. When properly ground and dosed, RHA acts as a pozzolanic cement additive, improving durability and reducing permeability. Mix design should be developed according to project requirements.

Q3. Is VinaTap RHA safe for the environment?

Yes. It is produced by reusing agricultural waste (rice husk) in biomass cogeneration. The ash is non-hazardous and helps reduce landfill waste and CO₂ emissions compared to traditional fuels.

Q4. Do you supply rice husk ash in bulk for large projects?

Yes. VinaTap specializes in large-volume supply for steel plants, cement producers, contractors and agricultural projects, with consistent quality from our factory in Vietnam.

Q5. Can rice husk ash be used together with cocopeat?

Absolutely. Rice husk ash combined with coco peat, coir chips and organic fertilizers creates a porous, nutrient-rich growing medium suitable for vegetables, flowers and nursery production.

9. Order Rice Husk Ash from VinaTap

VinaTap Vietnam – Rice Husk Ash, Biochar & Coco Substrates Manufacturer
WhatsApp / Viber: +84 888 888 609
Email: vinatap@gmail.com
Website: www.vinatap.vn

We are ready to support bulk buyers, distributors and industrial users worldwide with stable supply, competitive pricing and full technical information.

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