SU1447412A1 - Method of opposite flotation of iron ores - Google Patents

Abstract

The invention relates to the enrichment of minerals and allows increasing the recovery of iron minerals in the concentrate by increasing the selectivity of the action of the collector. The pulp is pretreated with a modifier, air conditioning is carried out with a collector based on amines from nitroparaffins and the subsequent release of waste rock minerals into the froth product during the concertatisation of iron in the chamber product. In addition, lignosulfonates containing 50-60% of the fractions precipitated by coagulants are additionally introduced into the air conditioning, in the following ratio, wt.%: Amines from nitroparaffins 70-90; lignosulfonates 10-30. The use as a collector of a mixture of amines from nitroparaffins and lignosulfonates in the described ratio allows to increase the extraction of iron minerals in i concentrate by 15-20% as compared with ANP-2. I (/)

Description

The invention relates to the enrichment of minerals and can be used in the flotation of iron ores.

The purpose of the invention is to increase the extraction of iron in horses (entrata by increasing the selectivity of the action of the collector.

Reagent-collector for flotation of iron ores on the basis of amines from nitroparaffins additionally contains lignosulfonates having 50-60% of coannuo fractions dried by coagulants, with the following ratio of ingredients, wt.%:

Amines from nitroparaffins 70-90 Lignosulfonates 10-30 Lignosulfonates containing 50-60% of the fractions precipitated by coagulants can be obtained by ultrafiltration separation of technical lignosulfonates on UAM-500 5TIM-II membranes or by ultrafiltration on tubular type membranes with membrane 5TIM-II. mi of the specified type. A predetermined ratio of coagulated precipitated fractions is obtained by adjusting the amount of the low molecular weight fraction to be injected, which is one of the components of the proposed collector. Control of the amount of low molecular weight fraction taken up is carried out by precipitation of the resulting ultrafiltrate.

Coagulite, for example, sulfuric acid iron in combination with lime.

The fractions of lignosulphonates thus precipitated by coagulants at 50-60% are mixed with 1-4% aqueous solution of ANP-2 in the ratio: ANP-2 70-90%, lignosulphonates 10-30%.

The proposed method proceeds with the following.

Thus prepared by the colleague, the pulp is processed at a solid-to-liquid ratio of 1: 2 for 0.5 minutes and the reverse flotation of iron ore concentrates is carried out, at which chamber product is a concentrate, as well. frothy - middling flotation for 4 minutes in two steps: 2 minutes main and 2 minutes control. 50-60% of the total collector consumption is introduced into the main flotation, the rest is control flotation.

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Example 1. A concentrate containing 64.1% of iron is treated at a solid-to-liquid ratio of 1: 2 for 0.5 min with a mixture of amines from nitroparaffins and lignosulfonates containing 50% of coagulant-precipitated fractions with a ratio of components (%) 90:10 in the amount of 200 g / t. The result is a flotation concentrate with an iron content of 68.0% when the output of the concentrate is 53.2% and the extraction of iron in the concentrate is 56.5%,

Example 2 A concentrate containing 64.1% of iron is treated at a solid-to-liquid ratio of 1: 2 for 0.5 min with a mixture of amines from nitroparaffins and ligonosulfonates containing 50% precipitated coagulants of fractions with co - the ratio of components equal to 70:30 in the amount of 200 g / t, the result is a flotation concentrate with an iron content of 67.3% with a concentrate yield of 74.5% and extraction of iron into a concentrate of 78.1%,

The proposed collector reagent for the flotation of iron ores, as compared to the known one, due to the greater selectivity of action, allows the concentrate yield to be increased by 10–20% and the extraction of iron in the concentrate by 10–20% without worsening the iron content in the concentrate.

In addition, this collector makes it possible to obtain easily destroyed foam during flotation enrichment, which prevents frothing of pump sumps and magnetic separators.

The use of ANP-2 in a mixture with lignosulfonates (LS) containing 50-60% of the fractions precipitated by coagulants allows to obtain concentrates containing 67.8-67.7% iron at a yield of 65.8-66.0% and recovery 69 , 7-69.8% of the product to be enriched, while with self-administered ANP-2, a concentrate with an iron content of 67.9% was obtained with a yield of 44.4% and a recovery of 47.0%.

Thus, with almost the same iron content in the concentrate (the error in determining the iron content in the concentrate is ± 5%), the yield of the flotation concentrate and the extraction of iron in the concentrate

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increases accordingly by 21.4-21.6% and 22.7-22.8%.

In the case of the use of ANP-2 in a mixture with JIC containing 40% of coagulant-precipitated fractions, a concentrate was obtained containing 67.6% at 45.0% yield and 47.5% recovered, i.e. in this case, the technological indicators do not practically differ from those obtained by the independent use of ANP-2,

When using ANP-2 in a mixture with drugs containing 70% of the fractions precipitated by coagulants, there is a decrease in the iron content in the flotation concentrate by 2.3% from 67.8-67.7% to 65.3% with high recoveries and concentrate output.

Consequently, the use of ANP-2 in a mixture with drugs containing 50-60% of the fractions precipitated by coagulants allows, without degrading the quality of the flotation concentrate, to significantly (more than 20%) increase its yield and recovery, i.e. improves technological performance of flotation separation.

When the content of drugs in the mixture with ANP-2 is 10%, the mass fraction of iron in the flotation concentrate is 68.1-67.3% with a yield of 53.2-74.5%, respectively, and 56.5 of 78.1% recovered At the same time, when using ANP-2 without the addition of drugs and with the addition of 5% of drugs, the concentrate yield is 44.4% when extracting the jelly in the concentrate is 47.0% and the iron content is 67.9%. At the same time, with an increase in the content of drugs in the mixture with ANP-2 from 30 to 35%, the iron content in the concentrate decreases from 67.9 to 66.1%,

Thus, when the content of drugs in a mixture with ANP-2, equal to 10-30%, you

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the course of the flotation concentrate is increased by 9.8-30.1%, the extraction of iron in the concentrate - by 22.7-31.1% with almost the same (68.1-67.3%) iron content in the concentrate.

The use of drugs containing 60% of the fractions precipitated by coagulants, mixed with ANP-2 with a ratio of components (%) of 10:90 - 30:70, respectively, allows to increase its yield by 14.2-22.9% without degrading the quality of the flotation concentrate , extraction - by 15.5-24.5% compared with the independent use of ANP-2, i.e. to improve the technological indicators of flotation enrichment. With an increase in the share of drugs in the mixture of more than 30% or a decrease of less than 10%, the technological parameters of flotation deteriorate.

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Claims (1)

Invention Formula A method of reverse flotation of iron ores, which includes pretreatment of pulp with modifiers, conditioning with an collector based on amines from nitroparaffins and imparting waste rock minerals into the penny product at an iron concentration in the chamber product, characterized in selectivity of the collector, lignosulfonates containing 50–60% of the fractions deposited by the coagulants are introduced into the air conditioning, in the following ratio of components, wt.%: Amines from nitroparafios 70-90 Lignosulfonates 10-30