Dolomite Ball is the granulated form of dolomite mineral (CaMg(CO₃)₂), produced at our Bhavnagar facility in full white and off-white grades. Unlike bentonite which swells and absorbs, dolomite's primary value is chemical: it supplies calcium and magnesium to soil (raising acidic pH from 5.0–5.5 toward the optimal 6.0–7.0 range), provides CaO and MgO to glass batch formulations (28–32% CaO, 18–22% MgO), and serves as a fluxing mineral in ceramic tile bodies.
The Bhavnagar region is better known for bentonite than dolomite — Gujarat's primary dolomite deposits are in the Saurashtra and Kutch regions. We source dolomite from approved mines within Gujarat, process it at our Thordi facility (crushing → granulation → screening → packing), and ship across India. Our value-add is processing quality: consistent granule sizing, controlled moisture, and verified CaO/MgO chemistry for each lot.
For agriculture buyers, Dolomite Ball is an economical alternative to agricultural lime (calcite) because it supplies both calcium and magnesium in a single application — important for crops like groundnut, cotton, and pulses that are sensitive to magnesium deficiency.
Technical Specifications
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Full White vs Off-White — Choosing the Right Dolomite Grade
Full white dolomite (whiteness above 90%) is used in glass manufacturing, ceramic glazes, wall putty, and premium paint fillers where colour is a critical quality parameter. Off-white dolomite (whiteness 70–85%) is used in agriculture (soil pH correction), construction, and industrial filler applications where colour is secondary to chemical composition.
Full white and off-white are quoted separately because full white requires selective mining from deposits with naturally low iron content. Iron (Fe₂O₃) is the primary colour contaminant in dolomite; full white grade typically has Fe₂O₃ below 0.2%, while off-white may have 0.3–0.8%. For a glass manufacturer, that 0.5% iron difference can be the difference between clear container glass and green-tinted glass.
Dolomite in Glass Manufacturing
In container glass (bottles, jars) and flat glass (windows, automotive), dolomite supplies CaO and MgO that control melt viscosity, improve chemical durability, and prevent devitrification (unwanted crystallisation) during forming. The MgO from dolomite is particularly important — it improves the glass's resistance to chemical attack and reduces the tendency to crack during thermal cycling. Glass manufacturers specify full white dolomite with tight Fe₂O₃ tolerance because iron colours the glass.
A typical float glass batch contains 12–16% dolomite. For container glass, the proportion is 8–12%. The consistency of CaO (28–32%) and MgO (18–22%) directly affects the glass melting temperature and finished product quality. Our certification of analysis on each shipment gives glass manufacturers the batch chemistry certainty they need.
Bhavnagar's Dolomite Processing Advantage
While Bhavnagar is primarily a bentonite hub, the dolomite processing capability here benefits from the same industrial ecosystem: crushing and screening expertise, pan granulation technology, and established logistics networks. Our Thordi facility's dolomite granulation line shares the same basic equipment as our bentonite granulation — pan granulators, rotary dryers, vibrating screens — but is cleaned and calibrated differently for the harder, non-swelling dolomite mineral.
We source dolomite from Saurashtra and Kutch region mines known for consistent CaO/MgO chemistry. Each incoming lot is tested for CaO, MgO, Fe₂O₃, and LOI (loss on ignition) before acceptance. Dolomite chemistry can vary significantly between mine faces — a face that averages 30% CaO one month may drift to 28% the next as the seam changes. Regular testing ensures we blend lots to hold the finished product within the guaranteed specification range.
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View full categoryFrequently Asked Questions
How much Dolomite Ball should I apply per acre for soil pH correction?
Application rate depends on current soil pH and target pH. As a general guide: 500–750 kg/acre for mildly acidic soils (pH 5.0–5.5), 750–1000 kg/acre for moderately acidic soils (pH 4.5–5.0). A soil test before application is strongly recommended — over-application can raise pH above 7.5, reducing micronutrient availability.
What is the CaO and MgO content of your dolomite?
Standard specification: CaO 28–32%, MgO 18–22%. Actual values are lot-dependent based on the source mine. Each shipment includes a certificate of analysis with the lot-specific CaO and MgO values. If you need a guaranteed minimum CaO or MgO, specify this during enquiry and we will confirm whether current stock meets your requirement.
Can dolomite ball be used for steel manufacturing?
Dolomite is used in steelmaking as a flux and refractory material, but our standard granule size (8–30 mesh) is designed for agriculture and glass applications. Steel plants typically require crushed dolomite in specific size fractions (10–50 mm for LD converters, 0–5 mm for sintering). We can supply crushed dolomite for steel industry applications upon request with specified size ranges.
What is the shelf life of dolomite ball granules?
Dolomite ball has an indefinite shelf life when stored dry. Unlike bentonite, dolomite does not absorb moisture or swell — it remains chemically and physically stable. The granules can be stored in open sheds without quality degradation, though bagged product should be kept off the ground to avoid bag deterioration from ground moisture.