With the rapid development of the global economy, steel industry has been developed rapidly. The increasing demand of iron ore at home and abroad further stimulates the development of the global iron ore beneficiation industry. As one of the leading enterprises in domestic mineral processing industry, Xinhai has been dedicated commitment to the research and development of iron ore process, technology and equipment for more than 20 years. According to the magnetic difference of different iron ore,

Xinhai finally established two iron ore beneficiation systems:

Strong Magnetic Iron Ore Beneficiation Process

Single magnetic iron ore, strong magnetism, easy to separate

Process Flow

Weak Magnetic – Cationic Reverse Flotation Process

Weak Magnetic – Cationic Reverse Flotation Process

√ Non-sticky flotation froth, stable beneficiation index

Liaoning 3000t/d Iron Ire Renovation Project

This plant initially used stage grinding – single magnetic separation - fine screening and regrinding process. Xinhai increased cationic reverse flotation process for undersize concentrate. The final concentrate was obtained after one roughing and one cleaning. The reverse flotation froth was sent to regrinding after thickening and magnetic separation, then magnetic concentrate returned to reverse flotation for reprocessing. Finally, iron concentrate was increased from 65.43% to 68.88%.

Weak Magnetic – Anion Reverse Flotation Process

Weak Magnetic – Anion Reverse Flotation Process

√ Low requirement of flotation pulp temperature, which is good for iron concentrate transportation; No acid treatment before filtering

Shandong 1500t/d Iron Ore Beneficiation Project

Xinhai increased anionic reverse flotation process of magnetic concentrate on the basis of the single magnetic separation process. Iron ore concentrate was obtained directly with a roughing, tailings were discarded with three scavenging, middlings returned to efficient thickener. Finally, iron concentrate was increased from 64.25% to 67.22%.

Single Magnetic Separation Process

Single Magnetic Separation Process

√ Simple process flow, small environmental pollution

Heibei 5000 t/d Iron Ore Beneficiation Project

The qualified iron concentrate of this project was obtained with Xinhai round vibrating screen - Xinhai magnetic separator. Oversize middlings were sent to closed-circuit grinding system (including Xinhai wet grid type ball mill and hydrocyclone) for fine grinding. And other qualified concentrates were gained by magnetic separation - fine screen - magnetic separation, then oversize material returned to thickening and magnetic separation for reprocessing. Finally, iron concentrate was increased from 67 % to 69 %, silicon dioxide was reduced from 6.5% to 4.5 %.

Xinahi Advantages

Strong magnetism, advanced magnetic separation process and equipment

Strong magnetic iron ore belongs to free-milling mine, which can get high-grade iron concentrate with weak magnetic separation process. With the improving demand of iron ore concentrate, Xinhai has speeded up the research and innovation of magnetic iron ore dressing technology and magnetic separation equipment in recent years, and achieved remarkable results.

Fine screening-regrinding technology improves iron concentrate grade

Xinhai increases fine screening-regrinding process in two stage grinding, stage separation, single weak-magnetic separation process, which timely separates fine minerals, reduces the overgrinding and improves the processing capacity of ball mill. The iron concentrate grade increases by about 8%.

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Weak Magnetic Iron Ore Beneficiation Process

Apply to hematite, limonite, specularite, siderite, martite or compound iron ore
Low grade, wide range of particle size, complex mineral composition, refractory iron ore

Process Flow

Weak Magnetic – Strong Magnetic – Anion Reverse Flotation Process

Continuous Grinding - Weak Magnetic – Strong Magnetic – Anion Reverse Flotation Process

  • Strong adaptability to iron ore. Continuous grinding to monomial dissociation then separate aiming at the fine dissemination size;
  • The combination of weak magnetic – strong magnetic and anionic reverse flotation not only improves the iron ore grade of anionic reverse flotation, that is easy to obtain high-quality iron concentrate, but also creates good conditions for anionic reverse flotation;
  • Easy to get good processing index.
Coarse and Fine Separation - Gravity Separation - Magnetic Separation - Anion Reverse Flotation Process

Stage Grinding - Coarse and Fine Separation - Gravity Separation - Magnetic Separation - Anion Reverse Flotation Process

  • Highly targeted process can obtain concentrate and discard tailings. Coarse-grain and fine-grain beneficiation methods not only save cost, but also ensure technical superiority;
  • Separation of narrow-sized feed avoids the chaos of flotation process and improves the beneficiation efficiency.
Coarse and Fine Separation - Magnetic Separation - Gravity Separation - Anion Reverse Flotation Process

Stage Grinding - Coarse and Fine Separation - Magnetic Separation - Gravity Separation - Anion Reverse Flotation Process

  • Stage grinding reduces two-stage grinding processing capacity;
  • Preconcentration discarding tailings, tailings quantity generally accounts for more than 45%, which greatly reduces the ore capacity of subsequent work and equipment loss.

Liaoning Anshan 500t/d Iron Ore Beneficiation Project

  • Introduction:
    On July 14, 2009, Xinhai signed a deal with customers to undertake one-stop mineral processing service about Liaoning Anshan 500t/d iron ore beneficiation project. The project was completed on July 15, 2010 and then put into operation. The final recovery rate was up to 80.5%, estimated annual output of iron ore concentrate was up to 1.8 million tons, the annual turnover reached 30.7 million, 33.8772 million net profit for the year.
  • Equipment:
  • Process:

    Liaoning Anshan 500t/d iron ore beneficiation project originally used weak magnetic - strong magnetic opening process. The practice showed that this process failed to select the final qualified iron ore concentrate, and the recovery rate didn’t reach the standard. Therefore, customers specially commissioned Xinhai mineral processing institute to reform. After testing the samples, Xinhai laboratory decided to adopt stage grinding - coarse and fine separation - magnetic separation - gravity separation - anion reverse flotation process. The grinding system consisted of 10 primary ball mill and 4 secondary ball mill. At the same time, Xinhai used fine screening-regrinding technology, which greatly improved iron concentrate grade. After a series of transformation, the iron concentrate grade was up to 72.25%, and the recovery rate was as high as 80.5%.

Xinahi Advantages

Stage grinding reduces the subsequent work and save the cost

One stage closed-circuit grinding and classifying system consists of ball mill and cyclone, which not only guarantees the classification efficiency and classification size, but also separates the qualified concentrate in advance.

Environmental friendly magnetic separation-flotation process

Magnetic separation timely separates the qualified coarse grain concentrate and tailings. And this combined process reduces more flotation processing quantity and reagents than direct flotation and saves a lot of flotation production cost.

Strong magnetic to discarding tailings-reverse flotation process, less flotation and more depressing

Strong magnetic process recycles fine grained iron ore that plays a role in desliming and tailings discarding. The reverse floatation process has simple reagent system that greatly reduces reagent into the pulp.