Method of concentration of minerals

FIELD: process engineering.

SUBSTANCE: invention relates to mining, particularly, to dressing of minerals, e.g. ores of ferrous, nonferrous and noble metals, nonmetallic minerals and man-made formations. Proposed method comprises crushing, shredding, sizing and drying of mineral processing products before electric separation. Drying is carried out at natural positive temperature of processing product and decreased pressure of 1-150 mm Hg. Heat power released in phase transfer is returned to drying process.

EFFECT: higher environmental safety, power savings.

1 dwg, 3 tbl, 3 ex

 

The invention relates to the mining industry, namely, concentration of minerals: ferrous, non-ferrous, rare and noble metals, non-metallic minerals, and man-made structures.

Known mineral processing, including drying of the source material, screening (classification), heated and dust removal, electrical, and magnetic separation. Preheating the material before separation is carried out at various factories from 74 to 140°C (Reference ore edited Ostrodumov, - M, "Nedra No., 1974, Vol.2, p.260-264). In this way process Titano-magnetite-ilmenite, indigenous and loose ore non-ferrous, rare and noble metals and non-metallic minerals, man-made structures. Dry methods of enrichment can reduce the energy costs of basic processing operations: electrical and magnetic separation due to the exclusion of the water and the flotation reagents.

The disadvantage of this method is that for effective dry separation requires deep dehydration, which is high-temperature drying due to evaporation of moisture. In this exercise the heating fluid (air), ore and drying apparatus with technical (practical) costs of thermal energy up to about 1,6kW×h per kg evaporated in the AGI. When the initial moisture content of approximately 15% of the energy costs of drying 1 ton of ore {produce enrichment redistribution) reach 300 kW×h and more. With all the expended energy is released into the atmosphere, breaking the heat balance of the planet (environmental pollution).

It is also known enrichment concentrates and other industrial waste electroseparation in conjunction with other methods, such as classification, regrinding, drying before electroseparation and other processes(not shown), magnetic separation, flotation, roasting (NF Olowinsky. Electrical methods of enrichment. - M., "Nedra", 1977, s.312-314, 246-250).

The disadvantage of this method is the use of large amounts of water (more than 10 times the volume and weight of the ore and flotation reagents. This consequently leads to high energy costs in their pumping and neutralization reagents, high energy consumption for drying, because deep dehydration of products of processing is due to the burning of fossil fuels, which increases the overall energy costs of processing the redistribution of up to 200-400 kW×h for each tonne of processed ore.

The objective of the invention is the creation of energy-saving eco-technology mineral processing.

The technical result that will be achieved from the use the of the invention, is to reduce energy consumption in mineral processing.

The technical result is achieved in that in the method of mineral processing, including crushing, grinding, classification, drying (deep dehydration) food processing and electrical separation, drying is carried out at a natural positive temperature product processing and reduced pressure of 1 to 150 mm Hg, and allocated in phase transition of the heat energy is recycled back into the process of drying food processing.

The invention consists in that the process of deep dehydration occurs under isothermal conditions due to the effect of phase transitions of the first kind.

The optimal dependence of low atmospheric pressure from 1 to 150 mm Hg from the temperature of the processed material obtained experimentally and is necessary and sufficient for carrying out drying of minerals due to its own heat dried product processing.

The effect of the phase transition of the first kind under reduced pressure allows to almost completely eliminate the cost of thermal energy for drying from external heat sources (combustion of hydrocarbon fuel, electric heaters). Energy on the technical implementation f the new transitions under reduced pressure (low vacuum) significantly less energy heat drying at atmospheric pressure (Isobaric process).

In addition, low-temperature vacuum drying eliminates the emission of steam, dust and heat due to the return (circulation) allocated in the phase transition of power back to the dried product, which leads to a substantial reduction in capital and operating costs.

From the analysis of scientific-technical and patent literature declare dependencies used barometric pressure temperature source of the processed product, providing a significant reduction in energy costs for mineral processing, we have not identified that allows to make a conclusion on the conformity of the proposed technical solution the criteria of "novelty" and "inventive step".

The invention is illustrated in the drawing, which shows a flow chart of mineral processing.

The invention is carried out as follows.

Example 1. Enrichment of indigenous ores dry method

In the processing of the original indigenous ore (feldspar, magnesite, kyanite, iron and ore other minerals) dry method when the initial moisture content of 3-5% carry out crushing, grinding, classification original ore, deep dehydration of the crushed ore prior to subsequent operations, electrostatic and magnetic separation (the example in high-performance electroseparation SE-70/140 and SE-200/200 and magnetic separators with Neodym-iron-boroviki magnets). While drying (evaporation of moisture from the ore) is carried out in a vacuum unit when the temperature of the primary ore of 18-20°C and barometric pressure of 18-20 mm Hg

Released in the vacuum unit thermal energy by the circulation through the heat exchanger back to the dried product (drying process).

Comparative results of processing ore by the claimed method and the method according to the prototype are listed in table 1.

Table 1
№№ p/pTechnology parametersPrototypeBy the present method
1234
1The initial moisture content, %3-53-5
2The source temperature, °C18-2018-20
3Fuel consumption (natural gas or diesel fuel), n is thermal drying, kg/t (kW×h/t)from 4.2 to 7.2 (50-90)-
4The power consumption for vacuum drying, kW×h/t-is 0.16-0.27
5The emission of heat into the atmosphere, MJ/t180-324-
6Drying temperature, °C140-50018-20
7The air pressure in the drying unit, mm Hg76018-20
8The total consumption of energy (electricity equivalent) kW×h/t total70-11020-30

As can be seen from table 1:

total energy consumption for the dehydration (drying) (electricity, thermal energy, p/p 3 and p/p 4) reduced from 50 to 90 kW×h/t to is 0.16-0.27 kW×h/t, i.e. about 300 times.

- total energy consumption on a production line enrichment decreases with 70-110 kW×h/t to 20-30 kW×h/t, which is 3-4 times,

the flow of the water and the flotation reagents is reduced to zero,

- the emission of thermal energy in the atmosphere is missing.

Example 2. Consequently, the sustained fashion fortification of dry food, pre-enrichment in the wet (using water)

In the processing of the original ore (titanium-magnetite-ilmenite ores, products of flotation and gravity separation of indigenous and placer ore) middlings with humidity from 9-10% to 20-30% and above is subjected to a similar vacuum drying at a temperature of initial ore 7°C and barometric pressure of 3-5 mm Hg with advanced destruction of the gravitational moisture in traditional units (settlers, screw classifiers, etc.). This dehydration, there is no need to use disk and belt vacuum filters and heat drying using high temperature drying (140-500°C) due to the energy of hydrocarbons or electricity.

Comparative results of dry processing of titanium-magnetite ores (after a previous wet enrichment) of the inventive method and the method according to the prototype are shown in table 2.

Table 2
№№ p/pTechnology parametersPrototypeBy the present method
1234
1.The initial moisture content, %9-109-10
2.The source temperature, °C77
3.Fuel consumption (natural gas or diesel fuel), heat drying, kg/t (kW×h/t)15 (180)-
4.The power consumption for vacuum drying, kW×h/t-1,10-1,15
5.The emission of heat into the atmosphere, MJ/t600-700-
6.Drying temperature, °C140-5007
7.The air pressure in the drying unit, mm Hg7603-5
8.The total consumption of energy (electricity equivalent) kW×h/t total20020-30

As can be seen from table 2, when obogs the Institute of magnetite ore mixed (wet-dry) technology:

total energy consumption for the dehydration (drying) (electricity, thermal energy) is reduced from 180 kW×h/t to 1.5-1.15 kW×h/t, i.e. approximately 160 times,

- total energy consumption on a production line enrichment decreases with 200 kW×h/t to 20-30 kW×h/t, i.e. in 7-10 times,

the flow of the water and the flotation reagents is reduced to zero,

- the emission of thermal energy in the atmosphere is missing.

Example 3. Technology of processing of placer deposits and formations

During the processing of alluvial and technogenic formations containing precious, rare and nonferrous metals, and nonmetallic minerals in the summertime at a temperature of 20-60°C and humidity of the product 10-20% drying before electric and magnetic separation is subjected washed classified product.

Technology parameters by the present and the proposed method are shown in table 3.

Table 3
№№ p/pTechnology parametersPrototypeBy the present method
1234
1Source what I humidity, %10-2010-20
2The source temperature, °C20-6020-60
3Fuel consumption (natural gas or diesel fuel), heat drying, kg/t (kW×h/t)15-30 (180-360)-
4The power consumption for vacuum drying, kW×h/t-0,7-1,5
5The emission of heat into the atmosphere, MJ/t600-1200-
6Drying temperature, °C140-50020-60
7The air pressure in the drying unit, mm Hg76020-150
8The total consumption of energy (electricity equivalent) kW×h/t total200-40020-30

total energy consumption for the dehydration (drying) (electricity, thermal energy) is reduced from 180-360 is W×h/t to 0.7-1.5 kW×h/t, that is about 200 times,

total energy consumption for the dehydration (drying) (electricity, thermal energy) is reduced from 200-400 kW×h/t to 20-30 kW×h/t, i.e. about 10-13 times,

the flow of the water and the flotation reagents is reduced to zero,

- the emission of thermal energy in the atmosphere is missing.

Method of mineral processing, including crushing, grinding, classification, drying products mineral processing before electrical separation, characterized in that the drying is carried out at a natural positive temperature product processing and reduced pressure 1-150 mm Hg, and allocated in phase transition of the heat energy is recycled back into the process of drying food processing.



 

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