Determination of mineral processing test plan for polymetallic iron ore

Some of the major programs and more metal ore beneficiation tests

Examples of the above are relatively simple iron ore, the difficulties encountered in the test was mainly due to disseminated fine material component is not complicated and neither the current bar even for comprehensive recovery of useful elements associated harmful elemental sulfur, phosphorus The content is not high, so the process combination is not very complicated.

Polymetallic iron ore, with many types of minerals and complex material composition, in order to fully utilize national resources, it is generally necessary to adopt more complicated processes, as follows:

1. magnetite ores containing copper and cobalt sulfide

According to the embedding particle size and sulfide content of the iron mineral, the following scheme can be adopted:

(1) If the sulfide content is small and the magnetite is coarsely embedded, the magnetite concentrate can be selected by dry magnetic separation and wet magnetic separation, and then the tailings are ground to the necessary fineness. Select copper and drill sulfide by flotation.

(2) If the sulphide content is high and the iron mineral is finely intercalated, the ore can be directly ground to the necessary particle size, first flotation of the sulphide, and then iron minerals from the flotation tailings.

2. Iron ore containing fluorite and rare earth

This type of ore is a comprehensive deposit of rare earth and iron. Due to the good floatability of fluorite and rare minerals, it is usually selected by flotation. The basic selection scheme for such iron ore is:

(1) Weak magnetic-flotation-strong magnetic (or re-election, flotation), that is, first select the magnetite with weak magnetic separation, then use flotation to recover fluorite and rare earth minerals, and finally use flotation and strong magnetic Select and re-elect to select weak magnetic iron minerals.

(2) Weak magnetic-strong magnetic-flotation, first select all iron concentrates by weak magnetic and strong magnetic separation, and then use tailings to recover fluorite and rare earth minerals by flotation.

(3) Weak magnetic-reverse flotation-positive flotation, the ferromagnetic iron mineral is selected by weak magnetic separation, the fluorite and rare earth minerals are selected by reverse flotation of magnetic separation tailings, and the products in the reverse flotation tank are positively floated. Separate weak magnetic minerals and gangue.

(4) Roasting magnetic separation-flotation, that is, first selecting all iron concentrates by roasting magnetic separation, and then using tailings to recover fluorite and rare earth minerals by flotation.

(5) Flotation of fluorite and rare earth minerals, followed by selective flocculation (or reverse flotation) to remove iron ore.

3. Phosphorus-containing iron ore

According to the existence form of phosphorus and iron, the following two kinds of inertia can be divided:

(1) Phosphorus exists in the form of apatite, which is the main form of phosphorus in iron ore. Iron is mainly present in magnetite or magnetite hematite. Possible solutions are:

1) Re-electing the reverse flotation, selecting the iron concentrate by re-election, and then removing the iron concentrate from the apatite by reverse flotation.

2) Weak magnetic-flotation-strong magnetic separation, first select the state magnet with weak magnetic selection, then use the flotation to select apatite, and finally select the hematite by strong magnetic separation.

3) Magnetic separation-flotation or flotation magnetic separation. When the main mineral in iron ore is magnetite and apatite, apatite is selected by flotation, and weak magnetic separation is used to select magnetite. It is also conceivable to flotation of apatite in a magnetic field.

(2) Phosphorus is in the form of colloidal phosphate rock, and iron ore is dominated by braided structure. This ore is difficult to choose. The desired scheme is:

1) Roasting magnetic separation.

2) Re-election-direct reduction-magnetic separation, re-election of iron concentrate by direct reduction roasting, roasting products are ground, and metal iron powder is recovered by weak magnetic separation.

4. Vanadium- containing titanium magnetite ore

The vanadium-bearing magnetite is a ferromagnetic mineral. The ilmenite is a weak magnetic mineral, but the specific gravity is large. If the stone contains sulfides and apatite, it is necessary to consider the flotation of titanium concentrate to remove sulfur and phosphorus, or Prior to the selection of titanium, the sulfur and phosphorus are preferentially floated. If the symbiotic minerals in the ore are very finely embedded, densely symbiotic or similar, it is often necessary to directly use metallurgical methods or separation processes. Therefore, the selection scheme for such ores is:

(1) The magnetite is recovered by weak magnetic separation, the ilmenite is recovered by re-election, and the cobalt- nickel sulfide is removed by flotation of ilmenite concentrate.

(2) Recovering magnetite by weak magnetic separation, selecting cobalt and nickel sulfide by flotation method, re-election-flotation combined process or re-election (selecting coarse particles)-strong magnetic separation (selecting fine particles)-strong magnetic fine The fluorite ore is selected by the combined process of mine flotation.

(3) Recovering magnetite by weak magnetic separation, selecting cobalt and nickel sulfide by flotation method, reselecting-strong magnetic separation-flotation combined with titanium, and finally selecting titanium concentrate by electric selection to improve titanium concentrate Mineral grade.

At present, magnetic separation and magnetic separation-flotation are mainly used in foreign countries. A single magnetic separation produces a vanadium-containing titanium magnetite or a vanadium-bearing magnetite concentrate. The magnetic separation-flotation combined process can produce three concentrates: vanadium-bearing iron concentrate, ilmenite concentrate and pyrite-based sulphide concentrate.

Because vanadium and iron are the same, iron and titanium are densely symbiotic, and cannot be separated by mechanical ore dressing . Metallurgical methods are needed.