Would you provide some details about the ore?

•Grade

•Mineralogy

•Size distribution for liberation

•Liberation characteristics, etc.

In iron ore reverse flotation (when hematite and other iron-bearing minerals are depressed) it's usual to employ caustized corn starch (sometimes tapioca starch). Typical dosage is about 600 g per metric tons of feed at pH 10.5 and 50 % of solid content in slurry.

The flotation of iron minerals! In the reverse flotation using reagents: amine, dextrin (starch), frother, CaO. However, necessary to use additional reagents to obtain high-quality concentrate.

Take a look at this paper for some factors to consider in process development / optimization:

de Araujo, A.C., et al., Ore mineralogy and its relevance for selection of concentration methods in processing of Brazilian iron ores, Trans. IMM, Section C, vol. 112, 2003.

All major companies now operating in the production of iron ore in Brazil currently employ or are planning to employ some sort of concentration method to upgrade their fine sized products (sinter feed fines and pellet feed fines). The criteria for the selection of the most adequate concentration method for each application include a series of parameters, the most important among them being related to ore mineralogy. This paper reviews the concentration operations currently employed in Brazil and shows how ore mineralogy plays a fundamental role in the selection of a given method. Examples involving gravity concentration (jigs and spirals), magnetic separation (Rare Earth wet drums, ferrous wheel, and Jones type magnetic separators) and flotation (especially column flotation) are discussed. Fundamentally important for the selection of a concentration method is the mineralogy of iron bearing minerals and gangue minerals presented to the feed to the concentration unit operation. For instance, the presence of liberated quartz as the major gangue mineral for a pellet feed size stream generally indicates that flotation will be the best selection for the concentration of that stream. However, even if magnetite is present only in the form of crystal relicts within hematitegrains, it may lead to the selection of either magnetic separation alone or a combination of magnetic separation and flotation for concentrating such material. Presence of gibbsite and/or kaolinite as the major phase containing alumina will also affect the selection of the concentration method in all cases. Again for the case of pellet feed size streams, kaolinite does not interfere with flotation whereas gibbsite tends to contaminate flotation concentrate (pellet feed fines) as it is depressed together with iron oxides and hydroxides during the reverse cationic flotation process.

The reverse flotation of iron concentrates flows after the magnetic separation. Purpose of reverse flotation: removal the harmful impurities (SiO2, Al2O3) from the iron concentrate. Consider an example. After magnetic separation, TheMagnetite plant has the obtained iron concentrate with an iron content of 70 %. Also the concentrate comprises 1.87 % of SiO2 and 0.52 % of Al2O3. On the Plant there is modern equipment, which is perfect for this type of flotation; there are best expensive reagents. At the reverse flotation, often using traditional reagents: amine, dextrin (starch), frother, CaO. However, the flotation has a problem. When adding a starch to the flotation, the content of SiO2 in of iron concentrate is 0.8-0.9 %. If carried out flotation without the starch then content of SiO2 in the iron concentrate is 0.8-0.9 %. Obviously, there is no effect from the use of starch. The Plant decides not to buy starch, reducing costs.

What happened? Why in both cases the content of SiO2 in the iron concentrate equally high and much higher than the required? How to help to the Plant to lower content of SiO2 in the iron concentrate?

As manufacturers of the reagents can convince the Plant to buy and to use the starch?

In order to obtain the necessary quality of the concentrate, it is necessary to use yet and other reagents.

What are these reagents? (When adding the reagent content of SiO2 and of Al2O3 in the iron concentrate decreases the consumption of amine decreases.)

QUALITYOF CHEMICAL:

• Starch used is a specially made for flotation. It is made at very low temperature. You need to buy only from those who are supplying to Iron ore beneficiation. Others do not work.

•May be Silica is in locked form. Go for microscopic study to know more about this. If silica is in FREE form yes you can further remove it using column flotation technology.

•It all depends on the end user. Is he really interested in low silica? It is required for FERRITE making.

CONFIRM END USE

Who so ever do flotation have report prepared by a mineral specialist who do lab testing and pilot plant testing to decide Dosage, Strength of solution, Monitoring flow and dosage, etc.

We do have 100% data on dosage, solution strength, quality control, and all technologies adopted for flotation. We do designing of dosing system too. Even strength of solution plays a major role. Preparation of chemicals is an art. We have 100% pollution free technology in preparation of chemicals. And precipitation of Hexavalent chromium flotation effluent settling and storage of waste recommended by INDIAN pollution control board.