High Activity Magnesium Oxide (MagChem 40 Equivalent)
Brief Introduction
High-activity magnesium oxide is a fine-particle, high-purity magnesia powder manufactured under controlled calcination conditions. This grade matches the performance benchmark of MagChem 40, featuring high surface reactivity, ultra-low impurity content, fine 2000-mesh particle size and low bulk density.
Strict quality control is implemented throughout production, with each batch tested for key indicators including MgO content, iodine adsorption value, whiteness and impurity levels to maintain consistent performance. It is widely supplied to mineral processing plants, chemical manufacturers and industrial distributors requiring reliable high-purity magnesium oxide feedstock. We also can supply levels of Hydration Activity≥86% and Hydration Activity≥85% for customer's option.
Application Scope
In mineral processing, high-activity magnesium oxide is applied for pH adjustment, acidic solution neutralization, heavy-metal precipitation and wastewater treatment within hydrometallurgical circuits.
It serves as an alkaline reagent for treating acidic leach solutions generated during cobalt, nickel and other non-ferrous metal extraction operations. The product is suitable for mining plants, chemical formulators and bulk distributors requiring stable reactive magnesia materials for industrial applications.
Beyond mining applications, this magnesium oxide grade is also used in advanced ceramics, rubber and polymer filler systems, as well as flue-gas desulphurization processes.
Mechanism
When added into aqueous process solutions, high-activity MgO gradually hydrolyses to generate magnesium hydroxide. Its high specific surface area provides controlled hydroxyl release, enabling gradual pH elevation and reducing the risk of excessive local alkalinity compared with fast-reacting alkaline chemicals.
During hydrometallurgical wastewater treatment, released hydroxyl ions promote precipitation of dissolved heavy-metal ions as insoluble hydroxides. The high iodine adsorption value indicates abundant active surface sites, supporting effective neutralization and adsorption performance under suitable mixing conditions.
Its low bulk density and fine particle size improve dispersion in liquid systems, helping enhance reaction contact efficiency during process operation.
Physicochemical Properties
High-activity magnesium oxide is characterized by high MgO purity, low calcium and iron impurities, high surface activity and controlled particle size distribution. These characteristics support stable performance in sensitive hydrometallurgical applications where impurity control and reaction consistency are important.
Specifications
| Item | Standard Value | Test Result |
|---|---|---|
| Magnesium Oxide (MgO, 950℃/2h) | ≥98.5% | 98.7% |
| Calcium Oxide (CaO) | ≤0.05% | 0.03% |
| Hydrochloric Acid Insoluble Substances | ≤0.05% | 0.04% |
| Iron (Fe₂O₃) | ≤0.005% | 0.003% |
| Loss on Ignition | ≤8.0% | 5.1% |
| Bulk Density | ≤0.35 g/ml | 0.34 g/ml |
| Particle Size | 2000 mesh | 2000 mesh |
| Iodine Adsorption Value | ≥150 | 152 |
| Whiteness | ≥96 | 97 |
Storage & Handling
Store in a cool, dry and well-ventilated warehouse. Keep containers tightly sealed to prevent moisture absorption and carbonation from ambient air, which may reduce active performance.
Avoid contact with strong acids. Operators should use appropriate dust-resistant personal protective equipment during powder handling to minimize inhalation exposure. Keep separate from food-grade materials.
For bulk transportation, moisture-proof packaging should be used to maintain product quality during storage and delivery.
Advantages / Limitations
Advantages
Ultra-high MgO purity with low calcium and iron impurities, suitable for sensitive hydrometallurgical processes.
High iodine adsorption value indicates strong chemical activity and available surface reaction sites.
Fine 2000-mesh particle size supports efficient dispersion in aqueous systems.
Low bulk density improves mixing characteristics during liquid-phase treatment.
Stable batch quality supports continuous supply for mining operations and industrial distributors.
Limitations
This material absorbs moisture and CO₂ from open air; prolonged exposure may reduce reactivity.
It is not designed for high-temperature refractory applications.
Actual dosage requires adjustment according to solution pH, metal concentration and site process conditions.
Summary
High-activity magnesium oxide is a reactive magnesia product designed for hydrometallurgical pH adjustment, acid neutralization and heavy-metal precipitation applications. With high MgO purity, low impurity levels, fine particle size and stable batch consistency, it provides a reliable alkaline reagent option for cobalt, nickel and non-ferrous metal processing operations.
High Activity MgO – FAQ
Q1. What types of mining wastewater treatment applications are suitable for High Activity MgO?
High Activity MgO is suitable for various mining wastewater treatment applications, including acid mine drainage (AMD) neutralization, heavy metal removal, fluoride-containing wastewater treatment, and process water conditioning. Its high reactivity allows it to participate in acid neutralization and precipitation reactions under controlled conditions. Application performance depends on wastewater composition, acidity level, dissolved metal concentration, temperature, and treatment process design. Laboratory testing is recommended to determine the appropriate dosage, reaction time, and integration with downstream clarification or filtration systems.
Q2. How does High Activity MgO perform in acid mine drainage (AMD) neutralization and pH adjustment?
High Activity MgO can be used as an alkaline neutralizing reagent for acid mine drainage treatment by consuming acidity and increasing wastewater pH through magnesium hydroxide formation. Compared with less reactive magnesium oxide products, high activity grades generally provide faster hydration and reaction kinetics. The actual pH adjustment performance depends on acid concentration, particle size, activity level, mixing conditions, and residence time. Process optimization through laboratory neutralization testing helps determine the required dosage and operating parameters for stable AMD treatment.
Q3. How does High Activity MgO compare with lime (CaO) and sodium hydroxide in wastewater neutralization?
High Activity MgO, lime, and sodium hydroxide each have different characteristics in mining wastewater treatment. Lime provides strong alkalinity and is widely used for large-scale neutralization, while sodium hydroxide offers rapid pH adjustment but has higher chemical cost in many applications. High Activity MgO provides magnesium-based alkalinity and may offer advantages in certain heavy metal precipitation and sludge management scenarios. The most suitable reagent depends on wastewater chemistry, treatment objectives, operating cost, sludge characteristics, and environmental requirements.
Q4. How should the optimal dosage and reaction time of High Activity MgO be determined?
The optimal dosage and reaction time of High Activity MgO should be established through wastewater characterization and laboratory jar testing. Important parameters include initial pH, acidity concentration, dissolved metal ions, fluoride concentration, magnesium oxide activity, particle size, mixing intensity, and required final water quality. Overdosing may increase chemical consumption and residual solids, while insufficient dosage may result in incomplete neutralization. A properly designed testing program helps determine the most economical operating conditions for continuous wastewater treatment systems.
Q5. Can High Activity MgO remove heavy metals such as copper, nickel, cobalt, and zinc from mining wastewater?
High Activity MgO can contribute to the removal of dissolved heavy metals through pH adjustment, precipitation, and adsorption-related mechanisms. In mining wastewater containing copper, nickel, cobalt, zinc, and other metal ions, magnesium hydroxide formation can create conditions favorable for metal hydroxide precipitation. Actual removal efficiency depends on metal concentration, pH control range, competing ions, and wastewater chemistry. Pilot testing is recommended to evaluate treatment performance and optimize reagent dosage for specific mining operations.
Q6. Can High Activity MgO be used for fluoride-containing mining wastewater treatment?
High Activity MgO can be applied in certain fluoride-containing wastewater treatment processes through chemical reaction and precipitation mechanisms. The treatment performance depends on fluoride concentration, calcium and magnesium balance, pH conditions, reaction time, and solid-liquid separation efficiency. For applications requiring strict fluoride discharge limits, additional treatment steps or combined processes may be required depending on local regulations and wastewater characteristics. Laboratory evaluation is recommended to confirm fluoride removal performance and process feasibility.
Q7. How does High Activity MgO perform under low-temperature wastewater treatment conditions?
The reaction activity of High Activity MgO can be influenced by temperature because hydration and neutralization reactions generally proceed more slowly at lower temperatures. In cold environments below 10°C, factors such as particle size, activity level, mixing efficiency, and retention time become more important for maintaining treatment performance. Proper reactor design, sufficient contact time, and optimized reagent preparation can help improve reaction efficiency. Testing under actual operating temperatures is recommended for reliable process design.
Q8. What are the key technical parameters of High Activity MgO for mining wastewater applications?
The key technical parameters of High Activity MgO typically include activity level, neutralization capacity, magnesium oxide content, specific surface area, particle size distribution, and bulk density. These properties directly influence hydration speed, dissolution behavior, and reaction efficiency in wastewater treatment systems. Different applications may require different performance characteristics depending on acidity level, contaminant type, and process conditions. Product selection should be based on technical specifications and compatibility with the targeted wastewater treatment process.
Q9. How does High Activity MgO work together with flocculants such as PAM and PAC?
High Activity MgO can be combined with flocculants such as polyacrylamide (PAM) and polyaluminum chloride (PAC) in certain mining wastewater treatment processes. MgO primarily contributes to neutralization and precipitation reactions, while flocculants improve particle aggregation and solid-liquid separation. Proper sequencing of pH adjustment, chemical precipitation, and flocculation is important for achieving efficient clarification. Laboratory testing should be conducted to optimize reagent dosage, mixing conditions, settling performance, and final water quality.
Q10. How should High Activity MgO be stored and handled in mining wastewater treatment operations?
High Activity MgO should be stored in dry conditions with protection from moisture absorption because hydration can reduce handling performance and storage stability. Proper packaging, warehouse ventilation, and contamination prevention are important for maintaining reagent quality. During plant operation, appropriate feeding equipment, dust control measures, and personal protective equipment should be used according to safety documentation. Correct storage and handling procedures help maintain consistent dosing accuracy and reliable wastewater treatment performance.