【Introduction】: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;
【Application】: Hematite separation process is suitable for complex structure hematite such as hematite and impurities with uneven distribution of particle size, ore with large content of fine particle, ore with small amount of magnetite and the gangue minerals containing quartz or kaolin.
Closed circuit grinding consisted of ball mill and cyclone is adopted in the first grinding. This ensures the separation efficiency, particle size and part of qualified concentrate, and it also abandons part of low grade tailings which reduce the grinding volume of medium ore and the loss of metal.
Magnetic separation sorts out the coarse concentrate and tailings, and reduces the working of flotation operation.
Strong magnetic process recycles fine iron minerals, which can play a dual role of de-sliming and tailings out creating good conditions for flotation. Reverse flotation process system is simple, which can significantly reduce the flotation reagents into pulp and decrease the adverse effect on the flotation process.
This hematite iron minerals are mainly composed of magnetite, hematite with uneven distribution, and gangue minerals are quartz. After comprehensive analysis of ore properties Xinhai designed the stages grinding, gravity - magnetic - 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 - 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
The Inner Mongolia 2,500t/d iron mineral processing plant was an EPC+M+O project. Xinhai conducted mineral processing test on the raw ore, which showed that iron was the major valuable mineral.
Full closed circuit of one-stage grinding and two-stage classification-four-stage magnetic separation-concentrates dewatering-tailings dewatering.
Grinding and separation: full closed circuit of one-stage grinding and two-stage classification, and four-stagemagnetic separation.
Concentrates dewatering: after magnetic separation, concentrates flowed by gravity to the permanent magnetic vacuum filter, where filter cake was transported by belt conveyor to the concentrates dump and filtrate was pumped to the recycling pond.
Tailings dewatering: tailings were thickened in the hydrocyclone; overflow flowed by gravity to the high-efficiency deep-cone thickener for first-stage thickening and underflow together with thickener underflow flew by gravity to the dewatering screen; screen water was pumped to the first-stage thickening process; materials on the screen were dry tailings which were transported by belt conveyor to the dump.
The process led to better separation and concentration of iron ore and thus better production indices.
The Xinjiang 3,300t/d iron mineral processing plant was an upgrading project. Xinhai provided new equipment and technological process in ways that original facilities were fully utilized.
Full closed circuit of three-stage grinding and six-stage separation-concentrates dewatering-tailings dewatering.
Crushing and screening: one series of original crushing process was added.
Grinding and separation: the full closed circuit of three-stage grinding and six-stage separation was adopted.
Concentrates dewatering: after magnetic separation, concentrates were dehydrated in the disc filter, and then transported by belt conveyor to the dump.
Tailings dewatering: tailings were pumped to the thickener, where underflow was discharged by pump and overflow was recycled.
Thanks to sound plant design, the whole process comprising both old and new equipment worked smoothly so that the recovery met the requirement. The project received full recognition from the client.