For the flotation process, whether a mineral processing obtains the satisfactory
mineral processing indexes depends largely on the flotation reagent system,
including the type of flotation reagent, the amount of flotation reagent, the method
and location of flotation reagent added. In general, Xinhai helps customers to
determine the scientific and reasonable flotation reagents system according to the
results of mineral processing test, and continuously adjusts the flotation reagents
system in the production, so as to obtain the ideal technical and economic
Before selecting the type of flotation reagent,
Xinhai mine research institute will learn about the process
mineralogical properties of the ore firstly, including:
◆Content of chemical composition in the ore;
◆Is the ore sulfide or oxide? And the oxidation
degree of the sulfide ore;
◆Type, content and particle size of useful minerals
and gangue minerals, as well as their dissemination and impregnation
◆Distribution of recyclable associated precious
metals and dissipated metals.
After grasping the process mineralogical
properties of the ore, Xinhai mine research institute will determine its
flotation principle. Different flotation principles mean different
flotation reagent systems. Based on more than 20 years of mineral
processing practice and experience, Xinhai mine research institute has
summarized several experiences as follows:
◆Easiness to hardness, that is, float the
easy-floating minerals first, then float the difficult-floating
minerals. Inhibit the minerals with poor floatability, or inhibit
those easy-inhibiting minerals. Do not inhibit those minerals with
good floatability and difficult-inhibiting.
◆Less floating and more inhibiting, that is, float
the lighter minerals first, and then inhibit the substantial
minerals, which is easy to obtain better mineral processing
◆Float high-value and inhibit low-value, that is,
float those high-value minerals and inhibit those low-value
minerals, which is easier to achieve the purpose of flotation.
After selecting the floatation principle, Xinhai mine research institute will
select the flotation reagent schemes for different floatation cycles one by
one, which is required to refer to the practical experience of similar
mineral processing plants, and analyze the ore properties, possible
flotation schemes, then select the collectors, regulators and foaming agents
Purpose: Enhance the hydrophobicity and
floatability of the mineral
Sulfide ore: xanthate, aerofloat, diltiazem;
Nonsulfide ore: carboxylic acids, sulfonic
acids, sulfuric acid esters, arsonic acid, phosphonic acids,
hydroxamic acid, amine
Nonpolar ore: neutral oil (kerosene, diesel)
Purpose: Adjust the effect of collector and
1. Inhibitors: Increase the hydrophilicity
of the mineral surface and reduce the floatability of the
Sulfide ore: Lime inhibits used to inhibit
pyrite; cyanide inhibits used to inhibit sphalerite, pyrite,
chalcopyrite; sulfite used to inhibit sphalerite, pyrite;
zinc sulfate used to inhibit sphalerite; dichromate used to
Nonsulfide ore: Sodium silicate used to inhibit
gangue minerals, such as quartz, silicate.
2. Activator: Promote the action of minerals
and collectors or remove the inhibiting effect
Copper sulfate, silver nitrate and lead nitrate can be used
as activators when the collector is the xanthate;
Calcium chloride and barium chloride can be used as
activators when the collector is fatty acid.
3. pH value regulator: Adjust the acidity of
Purpose: Promote the formation of stable
foam in the slurry
Classification: Commonly pine oil, terpinol
oil, cresol, fatty alcohol.
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In the flotation process, Xinhai mine research institute suggests that the appropriate dosage
of flotation reagents should be selected according to the results of mineral processing
tests. In the actual production, Xinhai mine research institute will adjust the dosage of
flotation reagents according to the specific situation if the material composition changes,
otherwise the dosage of flotation reagents cannot be changed arbitrarily.
Due to the different ore properties, the dosage range of flotation reagent is
also different. Even for the same type of ore, there are also some differences
in the formation of ore deposit, so the content of useful minerals and gangue
vary, and the dosage of flotation reagent required in the flotation process are
Each flotation reagents usually do not interact with minerals alone, so it cannot
be viewed in isolation. For example, the collector and inhibitor often interact
in the same system, the activator and inhibitor also interact in the same
Collector: Add it to the agitation tank or flotation cell with the
foaming agent, while the insoluble collector (such as cresol aerofloat, white
catching agent, kerosene) is often added to the grinding mill to promote its
dispersion and increase the action time with minerals.
Regulator: Add regulator to the grinding mill firstly, which not
only make the inhibitor and collector play the role in the appropriate pulp, but
also eliminate some unavoidable ions that are harmful to the flotation effect.
Inhibitor: Inhibitor: Add it to the grinding mill before the
collector，which can promote the interaction between the inhibitor and the inhibited
Activator: Add it to the agitation tank for mixing with the slurry,
which can promote the action between activator and activable minerals.
Usually, Xinhai mine research institute will determine the dosing order according to
Raw ore: PH regulator - collector - foaming agent.
Inhibited ore: Activator - collector - foaming agent
One-time dosing: Add all the flotation agents in one time before the roughing
Application: Generally, one-time dosing method is suitable for those
reagents that are soluble in water, cannot be taken away by the froth and is not
easy to react in the pulp, such as lime, soda.
Advantage: high reagent concentration, easy to add.
Several-time dosing: Add the flotation reagents in several times along
roughing, concentrating and scavenging. Generally, add 60%~70% of the total amount
before the flotation stage, and the rest of reagents is added to the appropriate
locations in batches.
Application: Oxidizing, labile and reactive reagents, such as
xanthate, sulfur dioxide gas; Reagents that are insoluble in water and can be taken
away by the froth, such as oleic acid, aliphatic amine; Reagents required a strict
dosage, such as sodium sulfide.
Morocco 500tpd silver ore flotation project
Uganda 720tpd phosphorite ore flotation project
Vietnam 800tpd graphite ore flotation project
Mexico 1500tpd Cu-Pb-Zn, Au and Ag ore dressing project
Xinhai mine research institute and mine design institute have passed CNAS
international certification, who have the technical ability of carrying out
calibration and testing service according to the relevant international
standards. And the feasibility study report issued by Xinhai is recognized by
international financial institutions.
Xinhai laboratory has a complete set of modern and advanced equipment, including
crushing equipment, fine grinding equipment, roasting equipment, drying
equipment, spectrometer, atomic fluorescence spectrometer, atomic absorption
spectrophotometer, infrared ore testing equipment, etc.
Xinhai laboratory can conduct tests on various mineral processing methods, such
as gravity separation, magnetic separation, flotation, cyanide leaching and
adsorption, bacterial oxidation, acid leaching, wet dressing, special dressing,
heap leaching, tailings concentration and dry drainage, then determine the
technical parameters of each method and provide the reasonable ore dressing
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