SU1361193A1 - Method of processing iron-containing ores and slimes - Google Patents

Abstract

The invention relates to the processing of iron-containing ores and sludges and can be used to extract iron from oxidized ferruginous quartzites and sludges of iron ores. The purpose of the invention is to extract iron and save acid consumption during chemical enrichment. Leaching of iron from ferruginous quartzites and sludges is carried out at 25-60 ° C and a process time of 20-40 minutes in an aqueous mixture of 25% hydrochloric and 20% sulfuric acids with transmission through a mixture of sulfur dioxide. In this case, an iron extraction rate of 98-99% and an acid consumption saving are achieved. 1 hp f-ly, 4 ill., 1 tab. c- SS (L U) 05 X) 00

Description

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The invention relates to the processing of iron-containing ores and sludges, and can be applied, in particular, to extract iron from oxidized ferruginous quarts and iron ore sludges.

The aim of the invention is to increase iron recovery.

FIG. 1 given dependence of influence. sulfur dioxide on the efficiency of iron extraction (b) solutions of sulfuric acid of various concentrations; Fig. 2 shows the dependence of the extraction of iron on the concentration of hydrochloric acid in a mixture with sulfuric acid at C, 60 minutes; T: W 1:20; in fig. 4 shows the dependence of iron extraction with a mixture of acids of 25% HC1 and 20% of

solution temperature when passing

through a mixture of sulfur dioxide at 30 min.

The experiments were carried out on ores and ishas of oxidized ferruginous quartzites with an iron content of 30-45%.

The initial sample in an amount of 10 g was placed in a solution, then treated with an aqueous solution, a mixture of acids at a ratio, and leaching was performed under continuous mixing, the desired temperature of the mixture was maintained by thermostating.

To compare the performance of iron treatment in a known manner and the proposed material with a particle size of -50 + 0 micron, it was distilled with a 32% solution of hydrochloric acid at 100 C. With a process time of 40 min, iron extraction (5) was 85%,

Further leaching experiments were performed in sulfuric acid solution. Maximum iron recovery (80%) from ore of oxidized quartzite and shlambv is observed when using 60% at a temperature of peo

stock mixture of 90 C for 30 mi

leaching and particle size of -50 + 0 µm (Fig. 1, curve 2). When leaching a product with a particle size of -160 + 100 µm, the extraction is slightly reduced (77%) under the same conditions (Fig. 1, curve 1),

By passing sulfur dioxide 80 through this system, a slight increase in the extraction of iron into a solution of sulfuric acid (up to 83%) is observed under the same conditions; treating (Fig. 1, curve 3),

Further research is aimed at optimizing the process of extrusion

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vani iron. A mixture of acids (Fig. 2 and 3) was used, consisting of 5, 20, 30, 40, and 50% sulfuric acid (curves 5, 1, 2, 3, and 4, respectively) and various contents of hydrochloric acid. Leaching was carried out in a known manner with a mixture of acids: 20% hydrochloric and 5% sulfuric. Iron extraction was low, about 40% (FIG. 2, curve 5). In order to intensify the process, the concentration of sulfuric acid was increased. Experiments have shown that for 30 minutes at a reaction temperature of 80 ° C, maximum recovery (87%) is achieved in an acid mixture consisting of 25% hydrochloric and 20% sulfuric acids (Fig. 2, curve 1), While in pure solutions of acids of the same concentrations, the recovery is 40% and 70%, respectively.

The studies were then carried out in order to establish the optimal leaching time. It is established that in 60 minutes 94% of iron is extracted with a mixture consisting of 25% hydrochloric and 20% sulfuric acids. Therefore, an increase in leaching time by 30 min made it possible to increase the leaching rate by 7% (FIG. 3, curve 1).

Further research was directed to the possibility of increasing the extraction of iron from ores and sludges of oxidized ferruginous quartzites by passing sulfur dioxide through the mixture.

Passing sulfur dioxide through the mixture made it possible to increase iron extraction up to 98%, reduce the leaching time to 30 minutes and reduce the temperature of the reaction mixture to 40 ° C. As the temperature of the solution increases from 40 to 60 ° C, the extraction of iron into the solution remains almost unchanged and is 96-98% (Fig. 4).

The optimal mode of elimination when passing SOa sulfur dioxide is the following: the time is higher (lulling 30 minutes, temperature 40 ° C, with a maximum iron extraction of 98% (Fig. 4) ..

The results of the leaching of iron from oxidized ferruginous quartzites with a particle size of -50 + 0 microns under various conditions of elimination are presented in the table.

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The implementation of the proposed method allows, in comparison with the known method, to increase the extraction of iron while reducing the consumption of acids during the chemical enrichment of ferruginous quartzites and sludges,

Claims (2)

1. A method of processing iron-containing ores and sludges, mainly ferrous, including chemical 40 30 30 thirty 60 30 20 40 100 90 90 80 60 40 25 60 0 93 Melting with an aqueous mixture of hydrochloric and sulfuric acids, characterized in that, in order to increase iron extraction during chemical enrichment, leaching is carried out at 25-60 ° C, with a duration of 20-40 minutes, while passing sulfur dioxide through the mixture. 2. A method according to claim 1, characterized in that the aqueous mixture consists of 25% hydrochloric and 20% sulfuric acids. 32% HC1 60% 60% with SOj transmission A mixture of 25% HC1 and 20% Also Same with prop 50 ""%,% Ts3e "/ CHCt,% 70 No. t e ,. VNIIPI Order 6198/30 Circulation 605U L11 Random polygons pr-tie, Uzhgorod, st. Project, 4