RU2375118C1 - Reagent for floatation of sulphide copper-molybdenum ore - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to floatation of sulphide copper-molybdenum ore. The invention is based on using hydrazides of carboxylic acids of general formula

, where R is a radical of aliphatic carboxylic acids C_nH_2n+1, as a reagent for floatation of sulphide copper-molybdenum ore. The said hydrazines essentially contain from 7 to 10 carbon atoms.

EFFECT: increased extraction of copper and molybdenum without using additional reagents and special foaming agents.

2 cl, 1 tbl

Description

The invention relates to the field of concentration of sulfide polymetallic ores by flotation, in particular to the flotation of sulfide copper-molybdenum ores.

When flotation of sulfide ores, reagents of various structures are used, mainly sulfhydryl collectors (xanthates, aeroflot and others), apolar collectors (kerosene, machine oil, etc.) in combination with auxiliary reagents [Abramov A.A. Technology of processing and enrichment of non-ferrous metal ores: Textbook for universities. In 2 book - M .: Publishing house of Moscow State Mining University, 2005 - Book 1 Ore preparation and Cu, Cu-Ru, Cu-Fe, Mo, Cu-Mo, Cu-Zn ore - 575 p.]. The disadvantages of such collectors are insufficiently high technological parameters of flotation and low selectivity.

The closest solution to the result achieved is the collective flotation of copper and molybdenum sulfides using sodium butyl xanthogenate, including in combination with apolar hydrocarbons (diesel fuel, kerosene) and a foaming agent [Shubov L.Ya. et al. Flotation reagents in the processes of mineral processing: reference: In 2 book. / Ed. L.V. Kondratieva. - M .: Nedra, 1990 - Book 1. - 400 p.].

A disadvantage of the known flotation reagent is the need for the introduction of additional collectors, since effective flotation of molybdenite is achieved only after the addition of apolar collectors (kerosene, diesel fuel, transformer oil and others). Since apolar collectors are antifoam agents, such a mixture requires the addition of a foaming agent. The disadvantage is also the low selectivity (associated pyrite recovery).

The objective of the invention is to expand the resource base through the use of a reagent for flotation of sulfide copper-molybdenum ores, which provides high flotation and high selectivity without the use of additional collectors and blowing agents.

To solve this problem, it is proposed to use hydrazides of carboxylic acids of the general formula

where R is the radical of aliphatic carboxylic acids C _n H _{2n + 1} as a reagent for flotation of sulfide copper-molybdenum ores.

For use as a reagent for flotation of sulfide copper-molybdenum ores, these hydrazides are predominantly with a number of carbon atoms from 7 to 10.

As a result of the use of the proposed reagent, the extraction of copper and molybdenum is increased compared with the prototype without the use of additional reagents and special blowing agents.

It is known to use the collector hydrochlorides of the above hydrazides as a collector for flotation of potassium chloride from potassium ores [Pat. SU 1725465, MKI B03D 1/01. Potash ore flotation collector. Publ. 06/27/1997]. No information on its use in the flotation of sulfide copper-molybdenum ores was found.

As a reagent for the flotation of potassium ores, hydrazides as collectors of potassium chloride (sylvin) are effective only in the protonated form of RCONHNH ₃ ⁺ , which is observed at pH≤1.5-2. Under these conditions, they are selectively fixed on the surface of the sylvin, completing the crystal lattice of the mineral, since they are similar to potassium ions.

For the flotation of sulfide copper-molybdenum ores, the achievement of the technical result is explained by the presence of a polar functional active group of atoms (PHAG) and a hydrophobic radical in the inventive reagent, which imparts surface-active properties to the reagent. Due to the unshared electron pairs at the oxygen atoms, α 'and β nitrogen atoms, the phage can form donor-acceptor bonds with metal ions having free orbitals, as well as with metal sulfides having free valencies on the surface. When flotation of non-ferrous metal sulfides, chemosorption of hydrazides by the donor-acceptor mechanism is most likely; physical sorption is possible due to the presence of intermolecular hydrogen bonds in hydrazides.

From the foregoing, it follows that during the flotation of sulfide copper-molybdenum ores, the mechanism of chemical reactions differs from the mechanism acting during the flotation of potassium-containing ores.

Thus, we can conclude that the use of the known reagent for flotation of sulfide copper-molybdenum ores is not obvious and the proposed solution meets the criteria of the invention "inventive step".

To justify the choice of the collector of copper and molybdenum during the flotation of the claimed compounds with the optimal number of carbon atoms, a series of experiments was carried out using the following procedure.

Flotation technique

A sample of 100 g of ore was placed in a chamber of a laboratory flotation machine of model 237 PL with a volume of 0.5 l (17.7% solid). Then water was added, the medium regulator - 0.1% CaO solution to pH 9.5 (50 ml) and a 1% solution of the reagent in ethanol in an amount corresponding to 0.487 mol per ton of ore. The duration of conditioning was 1 min, flotation - 10 minutes Flotation was carried out at an impeller rotation frequency of 36.5 s ^-1 , air flow rate of 0.33 l / min, water - 0.02 l / min.

For the experiments, an ore sample of the Erdenet deposit was used with the content, wt.%: Copper - 2.56, molybdenum - 0.054, iron - 0.92. Ore was ground to a particle size of 65% - 0.08 mm.

Comparative indicators of flotation of sulfide copper-molybdenum ore using the inventive collector and a known reagent are presented in the table.

The advantages of the proposed solution compared to the prototype

1. An increase in copper recovery by 1.5% (92.9% for hydrazide with R = C ₇ H ₁₅ versus 91.4% for butyl xanthogenate) and molybdenum recovery by 7-12% (95.9% for hydrazide with R = C ₇ H ₁₅ vs. 83.0% for butyl xanthogenate).

2. Elimination of the need to use special blowing agents and additional reagents for the additional extraction of molybdenum, as in industrial schemes for preparing crude copper-molybdenum concentrate with butyl xanthogenate.

Claims (2)

1. The use of hydrazides of carboxylic acids of the General formula

where R is the radical of aliphatic carboxylic acids With _n H _{2n + 1} ,
as a reagent for flotation of sulfide copper-molybdenum ores. 2. The use as a reagent for flotation of sulfide copper-molybdenum ores hydrazides according to claim 1, mainly with the number of carbon atoms from 7 to 10.