Technology

MIT technology is an innovative, non-contact method for processing ore materials. Its key advantage is its effectiveness in processing non-magnetic ores, which distinguishes MIT from other magnetic pulse methods. Disturbances created at the crystal lattice level provoke the formation of microcracks at the interface between phases in intergrowths and on the surface of minerals, as well as changes in the surface charge of minerals. The versatility of the method, covering solids, liquids, and pulps, ensures a wide range of applications.

Magnetic-impulse field’s action on the ore
Weakening classification
Mining Wave Equipment
Existing production placement options to improve the performance of mills
Existing production placement options to increase extraction rate during cyanidation
Successful cases and technology tests results

Magnetic-impulse field’s action on the ore

Magnetic-impulse field’s mechanism of interaction on the ore could be represented in the following way. External magnetic field affects all the ore when the ore is exposed.

If there are piezoelectric materials (quartz, tourmaline and other ferroelectrics etc.) or magnetic grains (sulfides, oxides and other magnetic compounds of iron, nickel, chromium etc.) in the ore, MIT causes magnetostriction and piezostriction effects in these grains. It is designated by the appearance of deformations and stresses in minerals and especially at their boundaries.

Due to the heterogeneous nature of both electromagnetic and mechanical properties of minerals that compose the ore, concentration of fields and forces appears at the grain junction lines.

This helps to reduce the grinding energy consumption with the same quality of the concentrate.

MIT energy consumption — 0,1-0,2 kWh per ton.

I

II

III

The initial state of the ore material

Weakening classification

Category of rock	Name of rock	Magnetostriction	Pyezostriktion	Superficial charge of defects
I. The most favourable for MIT	Non-oxidized iron quartzites (and products of enrichment)	+	+	+
	Oxidized iron quartzites (and products of enrichment)	-	+	+
	Gold quartzites	-	+	+
II.Moderately favourable for MIT	Gold sulfide ores (and products of enrichment)	+	+	+
	Kimberlite	-	+	+
	Granitoids	-	+	+
	Basalt	-	+	+
	Diorite	-	+	+
III. The least favourable for MIT	Fluorite ores	-	-	-
	Barite ores	-	-	-
	Dolomites	-	-	-

Mining Wave Equipment

Existing production placement options to improve the performance of mills

1

Cyclone underflow processing of the first stage grinding mill

Appropriate in case of strong (firm) ores

2

Cyclon underflow processing on the last grinding stage

Appropriate in case of difficult (interspersed) ores

Existing production placement options to increase extraction rate during cyanidation

1

Processing supply of initial stage cyanidation

Appropriate in case of interspersed gold

2

Processing supply of final cyanidation stage

Appropriate in case of the formation of chemical compounds in the form of films

Magnetic-impulse field’s action on the ore

1

TsNIGRI laboratory tests results

2

Empirical tests – sulphide concentrate

3

Empirical tests – gold quartz ore

4

Empirical tests – tailing gold

5

Empirical tests – refractory sulphide concentrate

Cyanidation conditions: 100 grams of sample, pulp density 45% solid, cyanide concentration 1 g/l, protective alkali 0.03%, coal 3%.

The size of the ore grinding is 85% class - 0,074 mm.

.

Gold recovery, %

92

93

94

95

96

97

98

99

94

97.8

Без МИО

После МИО

Tailing gold content, g/ton

0

0.2

0.4

0.3

0.16

Без МИО

После МИО

Gold recovery, %

78

80

82

84

86

88

90

79.5

86.65

Без МИО

После МИО

Gold recovery, %

78

80

82

84

86

88

90

80.57

88.58

Без МИО

После МИО

Gold recovery, %

10

12

14

16

18

20

12.5

19

Без МИО

После МИО

Gold recovery, %

Без МИО

После МИО