Hematite Separation Process



Stage grinding, stage separation and high separation efficiency

The combination of multi process and environmental protection

Strong magnetic separation and reverse flotation process ensure the concentrate grade;


Hematite separation process is suitable for complex structure hematite ore, such as hematite ore and impurities with uneven distribution of particle size, hematite ore with large content of fine particle, hematite ore with small amount of magnetite and the gangue minerals containing quartz or kaolin.

【Process Description】

1. Hematite ore flotation process

The flotation process is mainly used for the separation of fine and micro-fine weak magnetic hematite ore, including positive flotation process (positive flotation of anionic collector) and reverse flotation process (negative flotation of cationic collector). Commonly used collectors include tallow fatty acid (soap), vegetable fatty acid (soap), paraffin soap oxidated, acid chloride, oxidized kerosene, sodium petroleum sulfonate, corn starch, etc.

◆ Positive flotation process: Hematite ore positive flotation process is a hematite beneficiation process of using anionic collectors to float iron ore from raw ore. It can achieve discarding tailings under the coarse particles without desliming.

◆ Reverse flotation process: Hematite mineral reverse flotation process is a hematite beneficiation process of using anionic or cationic collectors to float gangue minerals from raw ore.

In terms of the ore properties of hematite ore, reverse flotation process is more advantageous than the positive flotation process. Because the collecting object of the reverse flotation process is gangue, while the collecting object of the positive flotation process is iron ore. Therefore, it is difficult to obtain high-quality hematite concentrate for gangue minerals with serious inclusions.

2. Hematite ore magnetic separation process

Hematite ore magnetic separation process mostly adopts weak-strong magnetic separation process, which is used to treat magnetite-hematite mixed ore. Tailings of low-intensity magnetic separation are sent to strong magnetic roughing and scavenging after thickening, and the strong magnetic roughing concentrate is concentrated and selected by the strong magnetic separator after the thickening. The amount of strong magnetic minerals is easy to lead to the blockage of strong magnetic separator. So when the strong magnetic separation process is adopted, the weak magnetic separation operation is usually added before the strong magnetic separation operation to remove or separate the strong magnetic minerals in the ore.

In addition, hematite ore magnetic separation process can also adopt the strong magnetic separation-flotation process. The monomer quartz and clay chlorite and other gangue minerals in the ore are discharged under the rough grinding condition by strong magnetic separation, and the rough magnetic separation concentrate is sent to the flotation process after the fine grinding for producing the qualified hematite concentrate.

3. Hematite ore gravity separation process

Hematite ore gravity separation process mainly includes coarse grain gravity separation process and fine grain gravity separation process:

◆ Coarse grain gravity separation process is a kind of hematite separation process used to treat the deposit with high geological grade (about 50%), but the ore body with thin or multiple layers. For this kind of ore, only crushing without grinding can be adopted. In the case of coarser grain size, adopting the gravity separation process to discard the coarse tailings, so as to restore the geological grade.

◆ Fine grain gravity separation process is a hematite separation process mostly used to treat hematite with fine grain size and high magnetic content. After crushing and grinding, the mineral is in monomer separation, and then fine and high-grade concentrate can be obtained by the gravity separation process.

4. Hematite ore roasting magnetic separation process

When the mineral composition is complex and adopting other hematite beneficiation process are difficult to obtain a good separation index, the roasting magnetic separation process is often used to separate the hematite ore.

Roasting magnetic separation process means to carry on magnetizing roasting, so that the hematite or pseudomorphic hematite are transferred to magnetite, and then adopting the weak magnetic separator for separation.


Preventative case: Shanxi hematite ore beneficiation plant

The hematite mineral was mainly composed of magnetite, hematite with uneven distribution, and gangue minerals are quartz. After a comprehensive analysis of ore properties, Xinhai designed the follwing hematite separation process: stages grinding, gravity separation- magnetic separation- reverse flotation process— about 60% coarse concentrate and tailings obtained by grinding; gravity separation timely selected qualified coarse concentrate and got rid of coarse tailings; fine-grained treated by the strong magnetic separation- reverse flotation process.

This process has reasonability in economy and advance in technology. The final indexes: feeding grade 23.15%, concentrate grade 65.95%, tailings grade 10.05%; this result wins the praise of clients.

Xinhai sets a sample in mines industry relying on its advanced technology and rich experience, and many mine owners ask for cooperation with Xinhai. Xinhai dedicates to provide the best project for clients and now it has been the star in mine industry

Other cases:

Xinhai has many iron separation process cases! Welcome clients to visit our company, and we will company you to visit the production lines we designed.

A hematite in Philippines, the annual output of 700000 tons; Xinhai designed two stages desliming process; riffling treated by one roughing, one cleaning and three scavenging; the middling of first scavenging returned to second desliming process. Comprehensive indexes are 69.7% concentrate grade and 65.4% recovery rate.

A hematite in Jiangxi with extremely fine particle distribution was colloidal hematite, which is very difficult to separate. Xinhai designed the magnetic roasting-magnetic separation process. Finally, the concentrate grade reached nearly 62%, the recovery rate was 80%.

A hematite ore dressing plant in America, daily output of about 2100t, gangue minerals are quartz, calcium magnesium minerals, Xinhai adopted one stage crushing, one stage autogenous grinding and two stages pebble grinding, and the final grinding size was -0.025mm accounted for 80%.

【 Process Flow 】

Hematite Separation Process Hematite Separation Process

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