At present, the grade of raw tungsten ore in the world is decreasing year by year. There are
less and less easy-to-mining wolframite, while refractory scheelite and wolframite-scheelite
intergrowth ore gradually occupy the main position. Therefore, Xinhai Mining strengthens the
research on tungsten extraction process, and customizes the ideal tungsten extraction
equipment according to the different types of tungsten ore, strives to improve the tungsten
extraction efficiency and reduce the production costs.
Key: Obtain the tungsten concentrate with high recovery and high quality
√ In coarse grinding stage, Xinhai adds xanthophyll collector to float various sulfides
√ In the gravity separation stage, Xinhai adopts the shaking table to get some or all
qualified tungsten concentrate.
√ For the tailings after the gravity separation stage, Xinhai floats the scheelite with
oleic acid collector, and get 10%-25% gross concentrate, which is sent to wet
Grid Type Ball Mill
6S Shaking Table
XCF Flotation Cell
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Key: Roughing stage and concentrating stage
Roughing stage---Maximize the grade of the coarse concentrate;
Concentrating stage---Separate the calcium gangue minerals from scheelite to obtain the
qualified tungsten concentrate.
√ Xinhai uses the sodium sulfide, cyanide and chromate to inhibit the associated sulfide
minerals, and adopts the sodium silicate, tannin, sodium polyphosphate, chromate to
inhibit the gangue minerals. Then, using the sodium silicate or sodium carbonate to
adjust the pH value of the pulp to 9.5-10, and 11-12 for cleaning stage.
√ “Lime – flotation” process. Xinhai mixes the pulp with the lime, then adds the sodium
carbonate and sodium silicate, finally collects by the oleic acid and naphthenic
√ Xinhai adopts sodium silicate heating method, which means adding a certain amount of
sodium silicate to low-grade coarse concentrate, heating up, cooking, stirring,
dehydration and slurry mixing, then concentrating repeatedly. Finally, the high-grade
tungsten concentrate can be obtained.
Cylinder Energy-Saving Overflow Ball Mill
SF Flotation Cell
JJF Flotation Cell
High Efficiency Agitation Tank
Key: Using the jig to recover early, and shaking table to discard
√ Roughing: In the first stage of fine-grained roughing, Xinhai adopts jig to separate,
then directly enters into the concentrating stage.
√ Gravity separation: Xinhai adopts multi-stage jigging, multi-stage shaking table,
middling regrinding and gravity separation process.
That is, the jigging gross sand is produced when the qualified ore is
sent to multi-stage jigging after the vibrating screen. The coarse-grained jig tailings
are sent to grinding mill for re-grinding, and the fine-grained jig tailings enter into
multi-stage shaking table after the classifier, then the shaking table gross sand is
produced. The shaking table tailings are sent to the tailings pond, and the middlings
are returned for regrinding and re-separating, and the gross sand of jig and shaking
table is sent to concentrating stage.
√ Concentrating: Xinhai adopts flotation-gravity separation combined process or
flotation-gravity separation-magnetic separation combined process, and recovers the
associated elements in the concentrating stage.
Through the coarse and fine-grained table flotation (flotation -shaking
table combined method) and flotation to remove the sulphide ore, the sulphide ore of
table flotation and flotation merges into the sulfide ore flotation separation. And the
wolframite after table flotation and flotation becomes the wolframite concentrate by the
gravity separation process. If there are scheelite and cassiterite in the wolframite
concentrate, gravity separation-flotation or gravity separation-flotation-magnetic
separation combined process can be adopted to separate wolframite concentrate, scheelite
concentrate and tin concentrate.
√ Fine sludge treatment: Xinhai usually carries out desulfurization first, and then
adopts gravity separation, flotation, magnetic separation, electric separation or
combined process to recycle the tungsten ore according to the properties of fine sludge,
and utilize the associated metal minerals at the same time.
Round Vibrating Screen(YA)
BF Flotation Cell
For the extraction of tungsten from wolframite-scheelite intergrowth ore, especially the
fine-grained wolframite-scheelite intergrowth polymetallic ore, Xinhai usually adopts
the bulk flotation process.
Key:Separate the scheelite and wolframite from the symbiotic
√ Bulk flotation of sulfide ore - bulk flotation of wolframite and scheelite - heating
and separation of scheelite - strong magnetic separation of scheelite tailings - gravity
separation of wolframite;
√ Bulk flotation of sulfide ore - strong magnetic separation to separate wolframite and
scheelite - scheelite flotation - wolframite flotation.
Ore property: uneven distribution of mineral dissemination particle
sizes, and serious mineral mud.
Before: The original plant adopted crushing pre-separation-gravity
separation-concentrating process, which resulted in the loss of a large amount of
fine-grained tungsten minerals, high mineral processing cost and poor mineral processing
After: After making the careful research on the ore properties and
processing technology, Xinhai decided to optimize the wolframite process, add fine slime
processing technology, and finally get the better mineral processing indexes.
Project result: Comparison between before and after:
After the modification, the recovery of fine-grained wolframite was strengthened
obviously, and the influence of fine slime on the wolframite separation was reduced,
which obviously improved the recovery indexes and the economic benefit of the plant.
Xinhai has make class B design qualification, and set up mine design institute
and mineral processing research institute. More than 200 professionals provide
the technical support service for 70 kinds of ore.
Depending on its professional mineral processing EPC+M+O service, Xinhai has got
the EU certification, and ISO9001:2015 quality management system certification,
who is classified as the assured brand with advanced products and standard
Xinhai has multiple patents technologies, more than 500 mineral processing plants
spread among China, Southeast Asia, South America, Africa, Iran, Russia,
Mongolia, North Korea and other places, and Xinhai has established multiple
overseas offices around the world.
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