SU1404643A1 - Method of working mineral deposits - Google Patents

Abstract

The invention relates to mining. The goal is to reduce the cost of further processing of carbonate-containing phosphate-containing products by destroying carbonates and increasing the phosphorus content in the concentrate. The field is divided into panels and the reservoir is opened from the surface by wells. In the last position, the hydrophobic equipment is placed and hydraulic mineral erosion (PI) is carried out with the formation of inter-chamber pillars. The resulting slurry PI is dispensed to the surface and sent to gravity concentration followed by the preparation of a concentrate (K). The drain is fed to a sump and K is sent to an alluvium map for dehydration. Filtering material is sent to the spent space of the spent chambers by stacking. The leaching of PI from destroyed pillars is carried out by feeding sulfuric acid solution into the spent chambers. The productive solution is pumped out, which is sent to the reactor, where it is mixed with K to establish a pH of 2.5-4.5. The resulting pulp is sent to a thickener-settler, precipitated K, with separation of the mother liquor. The mother liquor is directed to the preparation of a leach solution for the treatment of destroyed pillars. 3 ill., 1 tab. (9 (L

Description

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The invention relates to mining, in particular to geotechnological methods for developing sedimentary deposits, the productive horizons of which are composed of low-permeable ores occurring in unstable host rocks.

The aim of the invention is to reduce the cost of further processing of products of the development of carbonate-containing phosphates due to the destruction of carbonates and an increase in the concentration of phosphorus in the concentration.

FIG. 1 shows a plan for mining the productive horizon, leaving the strip ore pillars; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

Example. The deposit is divided into K II, III panels, etc. The productive horizon 1 of ore, containing 4.5% of phosphorus pentaoxide and 10.4% of calcium carbonate, is opened by wells 2 from the surface. In wells 2, the hydroburning equipment 3 is placed and the hydraulic erosion of phosphorites in chambers 4 is started with the formation of inter-chamber pillars 5, for example tape ones. Formed during hydraulic erosion of the mineral in chamber 4, ore pulp containing 60% of the original ore is discharged to the surface and directed to gravity enrichment, which is carried out in hydrocyclones 6, the pulp is divided into a sandy fraction, which is a concentrate from outlet 16 , 6% of the power of hydrocyclones, and plums containing clay particles that accompany minerals. The drain is fed to a settling tank 7 for clarification and then to hydraulic erosion, and a concentrate containing 21.6% P2O5 and 10.1% calcium carbonate is sent to map 8 for alluvial dewatering.

In the developed space of the spent chambers 4 serves filter material 9 - sand. The laying is carried out in such a way that a gap 11 remains in chamber 4 between the sand and the overburden 10.

The dimensions of the intercameral ore pillars 5 are based on the condition of ensuring their destruction with the formation of cracks under the influence of pressure of the overburden upon completion of the laying.

After that, wells 2 of the And panel are fed with a leaching solution of sulfuric acid with a concentration of 25–30 g / l, which, filtering sand 9 in the chambers, reaches the destroyed pillars 5 and penetrates into the entire array of cracks through the cracks, while enriching component. Then, the productive solution (2 original ores) containing 7.2 g / l of PhO3 is pumped out through the wells of 2 panels I and III to the surface and fed to the reactor 12, where it is mixed with the concentrate to

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Setting a pH of 2.5-4.5. The resulting slurry directs to the thickener-settler 13 a concentrate is precipitated to separate the mother liquor. The mother liquor is sent for the preparation of a leach solution, and the sediment is a concentrate with a yield of 0.145 t / t of the original ore, containing 24.9%, for further processing.

Comparative data is given in the table.

As follows from the table, the proposed method allows to significantly reduce the cost of further processing of products of the development of carbonate-containing phosphates by eliminating the need for separate processing of PV solutions, for example, their evaporation, and increasing the content in the enrichment concentrate.

In this case, the best results are achieved when the pH of the concentrate treatment with PV solutions is in the range of 2.5-4.5 (experiments 3-5). In this pH range, the content of RF in the precipitated concentrate is 23.8-25%, which is on average 13% higher than with the known method. At the same time, the total cost of processing development products per 1 kg of PiOj extracted into these products is, on average, 1.3 times lower than with the known method.

It should be noted that the dependences of the P2O5 content in CO and the total cost of processing development products on the pH of the treatment of CO with PV solutions are extreme.

Claims (1)

Invention Formula A method of developing mineral deposits, including opening the reservoir wells, hydraulic erosion of minerals, the formation of pillars, the issuance of minerals to the surface in the form of slurry, followed by obtaining a concentrate, laying the developed space filter material, destruction of pillars by rock pressure, leaching of minerals from destroyed pillars feeding sulfuric acid into the waste chambers of the solution, pumping a productive solution to the surface, o It is distinguished by the fact that, in order to reduce the cost of further processing of products of geotechnological development of carbonate-containing phosphates by destroying carbonates and increasing the phosphorus content of the concentrate, the concentrate is treated with a productive solution to a pH of 2.5-4.5 and precipitated, and the mother liquor is sent to prepare a leaching agent solution for the treatment of disrupted celles.