A method for improving selectivity and recovery in the flotation of nickel sulphide ores that contain pyrhotite by exploiting the synergy of multiple depressants

A synergy and inhibitor technology, applied in flotation, solid separation and other directions, can solve the problems of lack and the selectivity has not been improved, and achieve the effect of promoting synergy

Active Publication Date: 2015-06-17
VALE LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the selectivity between Cu / Ni sulfides and pyrrhotite was not improved with the addition of lignosulfonate alone in the industrial process
[0009] In this sense, the prior art lacks methods to: a) improve selectivity and recovery in the flotation of Cu / Ni sulfide minerals bound to iron sulfides, and b) reduce or eliminate the use of problematic Polyamine chemicals (e.g. DETA) to minimize negative impact on the environment

Method used

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  • A method for improving selectivity and recovery in the flotation of nickel sulphide ores that contain pyrhotite by exploiting the synergy of multiple depressants
  • A method for improving selectivity and recovery in the flotation of nickel sulphide ores that contain pyrhotite by exploiting the synergy of multiple depressants
  • A method for improving selectivity and recovery in the flotation of nickel sulphide ores that contain pyrhotite by exploiting the synergy of multiple depressants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Inefficient pyrrhotite suppression using only D-912

[0066] figure 1 Nickel-copper ore (containing about 1.5% Ni (3.7% pentlandite), 1.5% Cu (4.3% chalcopyrite) and 21% Fe (19.7% pyrrhotite) and 72.3% rock (other silicates)) in rougher flotation of pentlandite and the results of the cumulative recovery of pyrrhotite. In this test, 1 kg of ore was ground in a rod mill to a P80-106 μm with the addition of 5 g / t collector (PAX – potassium amyl xanthate) and 400 g / t lime. An incremental rougher test was carried out at pH 9.5 using lime as a modifier. There was a 2 minute conditioning with 15 ppm frother (F160-13) in the process water after addition of inhibitor and collector separately. A 2.2L Denver flotation cell with a 1200rpm rotating shaft was used and 3L / min of air was applied in the flotation. Concentrates were collected after 0.5, 1, 2, 5, 8 and 12 minutes. The chemical additions to the rougher are summarized in Table 1.

[0067] Trials using only collector ...

Embodiment 2

[0070] For an ore raw material, D-912 and Na 2 SO 3 Effective pyrrhotite inhibition of

[0071] figure 2 Results are presented for the cumulative recoveries of pentlandite and pyrrhotite in rougher flotation of the same nickel-copper ore used in Example 1, where Na 2 SO 3 Add D-912 to the rougher. The ore was ground in the same manner as Example 1, including adding 5g / t collector (PAX) and adding 400g / t lime. When Na 2 SO 3 Pyrrhotite inhibition was observed at doses ≥ 200 g / t. In Table 2 the chemical additions in the rougher flotation are summarized.

[0072] Trials using only collector (PAX) showed no pyrrhotite inhibition. Using DETA / Na 2 SO 3 The tests represent acceptable pyrrhotite inhibition and bonanza metal recovery.

[0073] Proved to use 200g / t Na 2 SO 3 Doses of , by themselves, had some effect on pyrrhotite inhibition, but the results were not as good as with the benchmark chemicals DETA and Na 2 SO 3 Get the ones that are so good. Using D-912 an...

Embodiment 3

[0076] For intermediate streams use D-912 and Na 2 S0 3 lower recovery rate

[0077] Figure 3A with 3B Respectively presents a concentration of an intermediate stream containing 7.6% Cu (21.9% chalcopyrite), 6.4% Ni (17.3% pentlandite), 37% Fe (39.8% pyrrhotite) and 21% rock The results of the selectivity of pentlandite / pyrhotite and chalcopyrite / pyrhotite accumulated in machine flotation, where the Na 2 SO 3 Added with D-912 to select machine. This study involved rougher and concentrator flotation trials with inhibitors added to the concentrator section. A total of 10 g / t collector (PAX) was added to the rougher flotation and the rougher concentrate was collected for 6 minutes. In the concentrator section, the rougher concentrate is treated with lime as modifier at pH 9.5. There was a 2 minute conditioning after addition of inhibitor and collector separately, with 15 ppm frother (F160-13) in the process water. A 1.1 L Denver flotation cell with a 900 rpm rotating sh...

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Abstract

A method of using the synergy of multiple depressants to improve the depression of iron sulphide without compromising the recovery of the valuable sulphide minerals in the flotation of non-ferrous metal sulphides, while reducing or eliminating the use of environmentally problematic chemicals such as polyamines. The method has significant economic and environmental benefits. The multiple depressants comprise at least one organic polymer, at least one sulphur-containing compound and/or at least one nitrogen-containing organic compound.

Description

[0001] This application claims priority to U.S. Patent Application No. 61 / 623,459, filed April 12, 2012, entitled "A Method for Improving Selectivity and Recovery in the Flotation of Nickel Sulphide Ores that Contain Pyrrhotite by Exploiting the Synergy of Multiple Depressants" right, and is hereby incorporated by reference in its entirety. field of invention [0002] The present disclosure relates to methods of selective froth flotation of sulfide minerals using a combination of depressant reagents. Background of the invention [0003] Sulphide mineral flotation has been practiced since the early twentieth century. Its industrial importance is well recognized because concentrates from flotation can be more economically smelted and refined to provide crude metals. Froth flotation is a method of selectively separating valuable minerals from spent gangue material by exploiting differences in surface hydrophobicity. Generally, the flotation process involves grinding crushed o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/01B03D1/016B03D1/018
CPCB03D1/01B03D1/016B03D1/018B03D2201/06B03D2203/02B03D1/002B03D1/012Y02P10/20B03D1/02
Inventor J·董M·徐
Owner VALE LIMITED
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