High magnetite ore
In today's mining industry, simply pursuing high metal recovery rates is no longer sufficient to define a project's success. Circular economy, comprehensive resource utilization, and zero environmental impact are becoming core design standards for the next generation of mineral processing plants. This article will take a benchmark project processing high-magnetite gold ore as an example to deeply analyze how to construct a complete technical solution from efficient crushing and beneficiation to 100% tailings resource recovery.
Project Overview and Core Challenges
This project aims to process a special ore: gold-bearing ore with a high magnetite content (25%). Its goal is not only to efficiently recover gold but also to simultaneously produce high-quality magnetite byproducts and ultimately achieve complete resource recovery of all tailings for manufacturing high-strength paving stones.
Core Specifications and Challenges:
• Processing Capacity: 100-150 metric tons/hour (dry solids)
• Raw Material Characteristics: Gold-bearing ore, magnetite content up to 25%
• Feed Size: Maximum 70 mm
• Dual Objectives: Produce 6.4% gold concentrate and separate high-quality magnetite
• Ultimate Challenge: Ensure 100% tailings (p80 = 0.074 mm) are usable as building material raw materials, achieving zero emissions.
Detailed Explanation of Phased Technical Solution
Phase 1: Raw Material Preparation and Crushing
The goal of this phase is to create optimal conditions for subsequent separation, ensuring liberation and controlling particle size.
• Washing and Primary Crushing
Drum washing machine
◦ Drum Washer: The raw ore is first washed using a drum washer to effectively remove sludge and attached impurities, purifying the ore surface and laying the foundation for efficient crushing and separation, especially improving the operating conditions of subsequent crushers.
Hydraulic Cone Crusher
• Cone Crusher: For feed sizes up to 70mm, a high-performance cone crusher is used for medium and fine crushing. Its layered crushing principle efficiently produces products with uniform particle size and low flaky content, greatly optimizing the feed to the subsequent grinding stage and reducing overall energy consumption from the source.
Second Stage: Grinding and Mineral Liberation
Grinding is the most energy-intensive stage and is crucial in determining the final recovery rate and tailings properties.
• High-Efficiency and Energy-Saving Grinding System
Ball Mill
• LCC Optimized Ball Mill: We recommend ball mills equipped with ultra-wear-resistant liners and grinding media. Its core design principle is Life Cycle Cost (LCC) optimization. Through extreme wear-resistant protection, it significantly reduces maintenance downtime and replacement parts consumption, thereby minimizing the grinding cost per ton of ore over several years of operation.
Third Stage: Efficient Separation and Enrichment
Utilizing the high magnetite content in the ore, a reasonable separation process is designed to achieve a "double harvest" of gold and iron.
• Combined Magnetic Separation-Gravity Process
◦ High-Intensity Magnetic Separation (LIMS): First, a high-intensity magnetic separator is used to rapidly separate approximately 25% of the magnetic minerals (magnetite) after grinding, which are sold directly as a high-quality byproduct. This step significantly reduces the amount of ore entering the subsequent expensive gold beneficiation process, improving overall efficiency.
◦ Gravity Concentration: For the non-magnetic fraction (rich in gold), efficient centrifugal equipment (such as centrifuges or spiral centrifuges) is used for gravity pre-concentration. It can quickly recover liberated coarse gold particles, directly producing high-grade gold concentrate, avoiding the loss of fine gold particles during flotation or oxidation processes, making it an economical choice for improving total gold recovery.
Fourth Stage: Water Resources and Tailings Management
Core technological link for achieving zero discharge and resource utilization.
• Closed-Loop Water Circulation and Tailings Deep Processing
◦ High-Speed Thickener + Filter Press: Mineral processing wastewater is quickly clarified through a high-speed thickener, and the overflow water is returned to the process for recycling, achieving a closed-loop water circulation and significantly reducing fresh water consumption. The thickened tailings from the bottom flow are dewatered using a high-pressure filter press, producing a solid filter cake with extremely low moisture content.
◦ Tailings Brick Making Integrated System A key step is to transport the filtered tailings cake (P80=0.074mm, ideally uniform particle size) to a matching mixing and pressing station. By mixing it with cement, curing agents, etc., in a specific ratio and then high-pressure molding, high-strength paving stones, curb stones, and other building materials that meet standards are produced, truly transforming tailings into commodities and achieving 100% resource utilization.
Core Advantages Summary
| Advantage Dimensions | Specific Manifestations |
| Economic Benefits | Magnetite directly generates revenue as a byproduct; gravity pre-selection of gold is low-cost and highly efficient; tailings-to-product conversion opens up a second source of income. |
| Environmental Benefits | Achieves zero tailings dam discharge, completely eliminating environmental risks and land occupation; closed-loop water system achieves near-zero wastewater discharge. |
| Technological Benefits | The "magnetic separation-gravity" combined process is highly targeted and has a high recovery rate; LCC-optimized mills significantly reduce long-term operating costs. Social and Policy Benefits | Perfectly aligns with global circular economy and green mining policies, enhancing corporate social image and project approval rates. |
| Social and policy benefits | Perfectly aligned with global circular economy and green mining policies, enhancing corporate social image and project approval rates. |
Related Equipment Recommendations
As an equipment manufacturer, we can provide a complete set of core equipment for this solution:
• HP series multi-cylinder hydraulic cone crusher: Used for medium and fine crushing, producing high-quality mill feed with low needle-like and flaky content.
• LCC optimized ball mill assembly: Includes ultra-wear-resistant liners, high-performance grinding media, and an intelligent drive system.
• Complete dewatering and resource recovery equipment: Includes a high-efficiency thickener, a high-pressure diaphragm filter press, and supporting mixing, conveying, and pressing systems.
Frequently Asked Questions (FAQ)
Q1: Are there any restrictions on the type of ore for this solution?
A1: This solution is particularly suitable for precious or non-ferrous metal ores containing recyclable magnetic minerals (such as magnetite and vanadium-titanium magnetite). If the ore does not contain magnetic minerals, the process needs to be adjusted, but the overall concept of tailings resource recovery remains applicable.
Q2: How is the market for tailings-based bricks guaranteed?
A2: The market demand for building materials such as paving stones and plaza bricks is stable and substantial. Market research is necessary in the early stages of the project, and long-term supply agreements can be signed with local builders and municipal engineering departments. Due to extremely low raw material costs, the products have significant price competitiveness.
Q3: What is the approximate return on investment period for the entire system?
A3: The return on investment period depends on gold prices, iron ore prices, and building material sales. Because this solution generates profit through multiple products (gold concentrate + magnetite + building materials) and saves substantial costs on tailings dam construction and maintenance, it typically shortens the investment payback period by 20%-40% compared to traditional solutions, resulting in significant long-term economic benefits.
Conclusion
From the efficient cone crusher to the conversion of tailings into paving stones, this is not merely a mineral processing production line, but an industrial model that maximizes resource value and achieves a closed-loop environmental responsibility system. Facing the dual challenges of increasingly stringent environmental requirements and improving profitability, embracing an integrated "crushing-benefiting-resource recovery" solution will be the inevitable choice for smart mines.
About of Baichy Heavy Industry
Baichy Heavy Industry is a high-tech mining equipment company integrating R&D, manufacturing, sales, and after-sales service. Focusing on crushing, grinding, and mineral processing equipment, we provide professional solutions to our customers. We are ISO9001:2015 、certified, and our products include mobile crushing palnts, crawler crushing plant, construction waste crushing plants, jaw crushers, sand making machines, cone crushers, fine crushers, grinding mills, ball mills, etc., all with reliable performance to meet diverse project needs.
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