Jacobi vs HojeeCarb Coconut Shell Activated Carbon: An Objective Guide for Gold Recovery Buyers

The Comparison at a Glance

The short video below shows the same hands-on checks — water clarity, float rate, and bubbling — that we describe throughout this guide.

1. Size Uniformity

Size uniformity controls packing density, flow resistance, and how many fines a carbon bed generates. The more uniform the granules, the more stable the bed, the fewer fines escape with the overflow, and the lower your carbon loss — which in gold recovery translates directly into money. Per ASTM D2862, gold-grade carbon is typically screened to 6×12 or 8×16 mesh, and a tight spread within that range matters.

• Jacobi (PICAGOLD): Screened from coconut shell to 6×12 and 8×16 mesh. Per Jacobi's published data, PICAGOLD grades hold a mean particle diameter of ≥2.48 mm (6×12) and ≥1.55 mm (8×16), with platelets (flat, off-shape grains) controlled to <4% on standard grades and <1.5% on the premium G210 Ultima.
• HojeeCarb: A multi-stage screening process keeps each batch within a narrow size window, with a low share of off-spec grains and fines. Screening QC runs before packing, so what arrives at the destination port matches the COA.

A simple site check: spread a handful from each supplier on white paper and look at grain evenness and dust. Uniform carbon looks consistent to the eye — that quick check catches most batch issues before loading.

2. Water Clarity After Immersion

This is the most intuitive on-site test. Well-washed coconut shell activated carbon with little residual dust leaves the water clear after immersion. Dusty carbon turns the water grey and needs longer backwash before going online — that means downtime and wasted water. Drop an equal weight into two identical glasses of clean water and compare after 2–3 minutes.

• Jacobi: A mature washing and de-dusting process — water typically stays clear after immersion.
• HojeeCarb: Dedicated water-washing and de-dusting at the finishing stage — the water is equally clear, a detail invested in specifically because African and Central Asian mine buyers test this on arrival.

Good clarity means shorter pre-loading backwash, fewer fines entering your CIL circuit early on, and lower precious-metal loss during startup.

3. Float Rate in Water

Float rate reflects true density and how mature the pore structure is. Gold carbon needs to sink fast and float little. Floating grains escape with the overflow during CIP/CIL operation, causing carbon loss and wasting adsorption area — every gram that floats away is a gram that never touches the gold-cyanide solution. To test, drop an equal amount into water and watch the share of grains still floating after 1–3 minutes.

• Jacobi: PICAGOLD is known for low float rates; consistent activation at its Sri Lanka facility helps keep density even.
• HojeeCarb: Float rate is tightly controlled — the carbon sinks fast with very few floaters, a result of dense, mature Davao coconut shell and a complete activation cycle.

4. Bubbling (Wetting and Air Release)

The moment activated carbon hits water, air trapped in the pores escapes as bubbles — direct visual evidence of pore development. Dense, sustained, even bubbling means rich porosity, large internal surface area, and full activation. Sparse bubbling that stops quickly can mean incomplete activation or pores partly blocked by ash.

• Jacobi: Noticeable bubbling when immersed, consistent with a well-activated product.
• HojeeCarb: Dense, sustained bubbling — the micropore structure developed during activation releases air steadily for 30+ seconds.

Watching how dense and how long the bubbling lasts is an indirect read on micropore development, which ties directly back to adsorption capacity and gold-loading potential.

5. Ash, Moisture, Hardness, and Attrition Rate

These are the hard numbers that decide tender acceptance. Every gold mine buyer has spec sheets, and these four indicators are always on them.

• Jacobi (PICAGOLD): Ash typically 2–3%, moisture within spec, and very low attrition — Jacobi's published data shows rolling-bottle attrition <1.0% on standard grades and <0.7% on the premium G210 Ultima, backed by Osaka Gas Chemicals quality systems.
• HojeeCarb: Ash consistently below 3%, moisture ≤5%, ball-pan hardness ≥98%, attrition ≤2%. Every batch ships with a full COA and welcomes third-party SGS / Intertek verification — the numbers match the paperwork.

These are the numbers that protect your gold. Low ash means more effective surface for adsorption. High hardness and low attrition mean less carbon loss, fewer fines, and less gold escaping with the tailings. Based on our 15+ years of manufacturing experience, the single most common reason mines switch carbon suppliers is unexpectedly high attrition loss — because every percent of extra fines is gold walking out the back door.

6. Iodine Number and CTC Value

Iodine number measures micropore development; CTC value reflects total pore volume including meso- and macropores. Together they tell you how much adsorption capacity the carbon actually has. For CIP/CIL, coconut shell carbon typically needs an iodine number of 1000–1100+ mg/g and a CTC confirming full activation.

• Jacobi (PICAGOLD): Specifies its gold grades primarily by K value and R value (see below) rather than headline iodine numbers. Its coconut shell base delivers the fully developed micropore structure gold-cyanide adsorption requires.
• HojeeCarb: Iodine 1050+ mg/g, CTC fully in range, reflecting a complete activation cycle with premium Davao coconut shell. At a matching micropore profile, HojeeCarb delivers equivalent adsorption kinetics at a more competitive price.

Key point for buyers: iodine alone does not tell the whole story. Two carbons with the same iodine number can have very different gold-loading performance if their pore size distribution differs. Always request both iodine and CTC, and ideally a gold-loading test (K and R values).

7. Raw Material

Coconut shell is the premium feedstock for activated carbon used in gold mining — more developed micropores, higher natural hardness, and lower ash than coal- or wood-based alternatives. But not all coconut shells are equal; maturity, region, and post-harvest handling set the natural baseline.

• Jacobi: Produces its PICAGOLD gold carbon at its Sri Lanka facility. Sri Lankan shell is well-regarded for density and maturity, and long supply relationships give feedstock stability.
• HojeeCarb: Uses premium coconut shell exclusively from the Davao region of the Philippines. Davao sits in the tropics at the right latitude, where coconuts are highly mature and the shell is dense — a widely recognized source of top coconut carbon feedstock. That origin contributes to HojeeCarb's consistently strong hardness and micropore numbers.

The key is not only which country the shell comes from, but shell maturity combined with the carbonization and activation process. Premium Davao shell plus a mature process delivers dependable iodine, hardness, and gold-loading performance batch after batch.

8. Gold Loading Performance

For gold carbon, every earlier indicator ultimately serves one thing: gold-loading capacity and adsorption kinetics.

• Load capacity (K value): grams of gold per unit of carbon at equilibrium (often kg/t) — higher means less carbon consumed per ounce recovered.
• Adsorption rate (R value): how fast the carbon reaches loading equilibrium — faster means a more efficient CIL circuit.
• Elution & regeneration: how cleanly gold strips, and how many reactivation cycles the carbon survives — driving total cost of ownership.

Per Jacobi's published PICAGOLD data, the range runs from K 26 kg/t / R 50% up to K 30 kg/t / R 60% on the premium G210 Ultima:

• Jacobi (PICAGOLD): A mature export brand with well-documented K/R loading data and a graded line, from workhorse G208AS to the high-activity G210 Ultima. Many mine metallurgists use PICAGOLD as their reference standard.
• HojeeCarb: At a matching K value and R value, HojeeCarb's gold-loading performance is on par with leading international brands. Gold plants in Ghana, Tanzania, Sudan, and Ethiopia already run HojeeCarb carbon in their CIL circuits — comparable performance, better price.

HojeeCarb is confident in its coconut shell activated carbon. The right way to settle any comparison is a side-by-side loading test on your own pulp — request matched samples and run them under identical conditions.

Why Global Customers Choose HojeeCarb

Summary Comparison

Jacobi PICAGOLD is a proven, premium choice — no question, and its graded K/R line gives buyers a clear ladder from G208AS to G210 Ultima. If you weigh gold-loading performance at a matched K value and R value, a more competitive price, and responsive technical support, HojeeCarb coconut shell activated carbon deserves a spot on your shortlist. We are confident our carbon can meet and hold the performance your gold recovery operation needs.

Frequently Asked Questions

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