SU1721021A1 - Method of producing manganese oxide concentrate - Google Patents

Abstract

The invention relates to chemical methods for the beneficiation of ores and can be used in the hydrometallurgical processing of manganese-containing raw materials. The aim of the invention is to reduce the impurities in the target product. The method consists in developing the initial manganese-containing ammonium sulfide solution with a concentration of 90-330 g / l in an amount of 0.3-0.9 of the stoichiometric required at pH 7.5-8.5. The method according to the invention allows to reduce the mass fraction of impurities in the Ca + Md concentrate from 0.2-0.5% to 0.02-0.03%, Na + K from 0.4-0.9% to 0.01-0. 06%. 4 tab.

Description

The invention relates to chemical methods for the beneficiation of ores and can be used in the hydrometallurgical processing of manganese-containing raw materials.

The aim of the invention is to reduce the impurities in the target product.

Example 1. In a solution of manganese sulfate with a volume of 1 l, containing 52 g / l Mp 0.5 g / l Ca, 0.1 g / l MD, 6 g / l Na, 0.3 g / l K, while stirring is 150 ml of ammonium sulfide solution with a concentration of 330 g / l, i.e. 79.3% of the stoichiometric required. The process was conducted at pH 8.0. The precipitation time was 1 h. The resulting suspension was filtered, the filter cake was washed by repulping at a T: W ratio of 1: 10. and filtered again. After drying, the precipitate was calcined in a muffle furnace at 500 ° C. The resulting concentrate contained 68.7% Mn; 0.021% Ca + Md; 0.04% Na + K.

Example 2. To a 1 g dithionate solution containing 33 g / l Mp, 1.5 g / l Ca, 0.1 g / l Md, 3 g / l Na, 0.2 g / l K, 150 were added with stirring ml of ammonium sulfide solution with a concentration of 150 g / l (55.1% of the stoichiometric required). The process was conducted at pH 7.8. The process was then carried out as in Example 1. The resulting concentrate contained 67.7% Mn, 0.3% Ca + Md, 0.03% Na + K.

Example 3. To a solution of 1 liter manganese sulfate containing 52 g / l Mp, 0.5 g / l Ca, 0.8 g / l Md, 6 g / l Na, 0.3 g / l K, was added with stirring 170 ml of ammonium sulfide solution with a concentration of 330 g / l, i.e. 90% of stoichiometric required. The process was carried out at pH 8.5.

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The process was further carried out as in Example 1. The resulting concentrate contained 67.5 ° / Mp. 0.027% Ca + Md, 0.03% Na + K.

Example 4. The experiment was carried out under the same conditions as in Example 3, but ammonium sulfide was added in an amount of 213.5 ml with a concentration of 90 g / l, i.e. 30% of the stoichiometric required, the process was carried out at pH 7.5. The resulting concentrate contained 68.2% Mn, 0.020% Ca + Md, 0.03% Na + K.

Example 5. In a solution of manganese chloride with a volume of 1 l, containing 46 g / l Mp, 1.8 g / l Ca, 0.1 g / l MD, 2 g / l Na, 0.2 g / l K, with stirring 150 ml of ammonium sulfide with a concentration of 300 g / l, i.e. 79.13% of stoichiometric required. The process was conducted at pH 8.

Further, the process was carried out as in Example 1. The resulting concentrate contained 66.9% Mn, 0.03% Ca + Md, 0.03% Na + K.

Example 6. To a solution of manganese nitrate with a volume of 1 l, containing 39 g / l Mp, 3 g / l Ca, 0.5 g / l Md, bg / l Na, 0.9 g / l K, 150 ml of sulfide was added ammonium concentration of 118 g / l, i.e. 36.7% of stoichiometric required.

The process was carried out at pH 7.5. The process was then carried out analogously to example 1. The resulting concentrate contained 68.1% Mp.0.02% Ca + Md, 0.02% Na + K.

It has been established that when manganese is precipitated with a solution of ammonium sulfide in this mode, manganese passes into the solid phase, while the impurities — alkaline earth metal compounds (e.g., calcium, magnesium) remain in solution. Thus, contamination of the concentrate with impurities does not occur.

Deposition of manganese with other sulphides (for example, sodium, potassium) is inappropriate, since when this occurs, the concentrate is contaminated with residues of the precipitator and the goal is not achieved. The ammonium ion (NH44) is volatilized during calcination and does not clog the concentrate.

It was found that the introduction of ammonium sulfide in an amount of 0.3-0.9 times the stoichiometrically necessary ensures optimum deposition rates: the mass fraction of impurities (Ca + 2 + Md + 2) in the concentrate was 0.023-0.031% while extracting manganese in concentrate 27.3-89.8%.

In tab. Figure 1 shows the values of the indicators for the precipitation of manganese from a solution of manganese sulfate with a different amount (fraction) of the introduced precipitator — ammonium sulfide.

As can be seen from the table. 1, with the introduction of the precipitator in an amount equal to 0.3-0.9 of the stoichiometric required, the mass fraction of impurities in the concentrate (Ca + 2,)

was 0.023-0.031%.

At doses of the precipitant, less than 0.3 times the stoichiometrically required, practically no manganese precipitation occurs (the extraction of Mn in the concentrate is

3%). When extracting the precipitator dose above 0.9 from the stoichiometrically required extraction, the manganese attraction to the concentrate slightly increases, but the mass fraction of impurities increases more than 7 times. .

It was also established that the concentration of the introduced precipitator — ammonium sulfide, is 90-330 g / l, which is optimal, corresponding to a minimum content of impurities in the concentrate of 0.03-0.02 g / l.

In tab. Figure 2 shows the values of the mass fraction of impurities in the sediment concentrate at different concentrations of the precipitant solution.

From tab. 2 it follows that when using a precipitator solution containing less than 90 g / l of ammonium sulphide, the content of impurities in the sediment concentrate increases from 0.03% to 0.3-0.15%. With an increase in the concentration of the precipitant solution above

330 g / l, the stability of the solution is broken, it decomposes into hydrogen sulfide and ammonia. The mass fraction of impurities in the sediment concentrate does not change.

Concentrate sedimentation best

performed at a pH of 7.5-8.5.

.In tab. Figure 3 shows the values of the mass fraction of impurities in the concentrate and the extraction of manganese in the concentrate at different pH values.

As follows from the table. 3, at a pH of less than 7.5, sedimentation of the concentrate practically does not proceed, the process of sedimentation actually begins at pH 7.5. Increase

pH value above 8.5 is impractical because at the same time, the impurities present in the solution are transferred to the solid phase and the concentration of impurities in the concentrate increases 5 times (to 0.2%).

In tab. 4 shows the comparative figures of the known and proposed methods.

As follows from the table. 4, the proposed method, in comparison with the known, allows to reduce the mass fraction of impurities in the concentrate: Ca and Md from 0.2-0.5% to 0.02-0.03%, Na + K from 0.4-0, 9% to 0.01-0.06% and increase the mass fraction of MP in concentrate from 65.5-66.5% to 67-68%.

Claims (1)

Formula with sediment, characterized in that, with to reduce the amount of impurities in The method of obtaining oxide margetse product, as a reagent-concentrate concentrate, including treatment of powders, uses a solution of ammonium source manganese-containing 5 HI sulphide. concentration of 90-330 g / l in the amount of reagent-precipitator followed by from 0.3-0.9 from the stoichiometric required dividing and calcining the resultant and the treatment is carried out at a pH of 7.5-8.5. Table 1 Dol precipitator from stoichiometric. % 20 required Mass fraction + Mg + 2, in concentrate, Extract in concentrate,% s, o 30 50 70 90,100 0.020 0.023 0.024 0.027 0.031 0.237 27.3 48.5 69; 4. 89.9 91 The concentration of the precipitant solution, g / l Mass content Ca + 2 + Mg + 2 in the sediment,% 30 50 70 90,100 27.3 48.5 69; 4. 89.9 91 Table 2 50 . 70 90 150 220 330 0.39 0.15 0.03 0.02 0.02 0.02