SU1479540A1 - Method of processing manganese-containing initial material - Google Patents

Abstract

This invention relates to the field of processing manganese raw materials by the dithionate method. The goal is to improve the environmental conditions of the process by reducing the sulfur content in the manganese concentrate. The manganese raw materials are leached with a circulating solution of calcium dithionate, followed by precipitation of impurities and purifying the solution by filtration. Before filtering, a circulating solution of calcium dithionate in an amount that provides the product of calcium and manganese ion concentration concentrations equal to 174-195 g ² / l ^{2 is} fed into the pulp. The amount of sulfur oxide liberated decreases 800-1000 times. 2 tab.

Description

The invention relates to methods for extracting manganese from manganese ores and concentrates and can be used in hydrometallurgical methods for processing manganese-containing raw materials.

The aim of the invention is to improve the environmental conditions of the process by reducing the sulfur content in the precipitated manganese concentrate.

The method is carried out as follows.

Example. From a solution of calcium dithionate with a concentration of 125 g / l and manganese slimes with a manganese content of 21.6%, an initial pulp is prepared with a solid content of 300 g / l.

Leaching of manganese from the prepared pulp is carried out with sulfur dioxide until it reaches a pH of 1.5. After leaching, the liquid phase of the pulp contains 58.5 g / l Mri 1.2 mg / l Ca + 12.3 g / l 50; g and 149.6 g / l 8 gb. The product of the concentrations of calcium ions and manganese Csa42 was 0, 07 r2 / l2. Then, lime milk is fed into the leached pulp to precipitate impurities in an amount that provides an increase in pH to 4.0 - 4.5. After the impurities are deposited, a circulating solution of calcium dithionate in the amount of 0.37 m3 per 1 m3 of pulp is added to the pulp. The content of Ca + i ions in the pulp is 4 g / l, Mp g - 44 g / l, 5r02g - 1.19 g / l, SO, 2 4b 1

WITH SL

Ј

ABOUT

10.9 g / l. The product of calcium and manganese ion concentrations is 176 g2 / l2. The precipitate of impurities and the unleached residue are separated by filtration; then lime milk is fed to the filtrate to a pH of 8.5, and the chemical concentrate is precipitated.

The precipitated concentrate is filtered and washed. After drying, manganese concentrate contains,%: Mp 54.5; S 0.098; P 0.0012 and SiO 1.3.

In tab. Table 1 shows the sulfur content in the concentrate at various values of the product of the concentration of calcium and manganese ions in a solution of manganese dithionate before cleaning it by filtration.

As follows from the table. 1, with PC values of 174 g2 / l2 or more, the sulfur content in the concentrate is less than 0.1% or less.

Consequently, the introduction of a circulating solution of calcium dithionate into the solution before cleaning it by filtration in an amount that ensures the product of the concentrations of calcium ions and manganese is greater than or equal to

174 g2 / l2, allows to obtain a chemical concentrate corresponding to the sulfur content of the requirements for its use in the direct alloying of steels.

In tab. 2 shows the comparative indicators of the quality of the concentrate obtained by known and proposed methods.

From tab. 2 shows that the concentrate obtained by the proposed method contains sulfur in more than 20 rae less. In addition, the quality of the concentrate obtained is also enhanced by an increase in manganese in it.

five

five

0

0

five

0

A concentrate with a sulfur content of less than 0.1% is suitable for direct alloying of steels.

The upper limit of the product of concentrations (195 g2 / l2) is limited by economic considerations. With an increase in Ca + 1 Cmp + g 195 g2 / l2 (up to 235 g2 / l2), the amount of calcium dithionate circulating solution supplied is so increased that, due to the increased load on the tailings filtering, the cost of the chemical concentrate increases.

The amount of chemical concentrate of sulfur oxide released during calcination is reduced by a factor of 800-1000 compared with the known method and is 0.02-0.03 me / t. The environmental conditions of the inventive process are thus improved.

Claims (1)

Invention Formula A method of processing manganese raw materials, comprising preparing pulp from a circulating calcium dithionate solution, leaching manganese with sulfur dioxide gas, precipitating phosphorus and iron with lime milk, purifying the solution by filtration, precipitating manganese concentrate with lime milk and calcining the resulting concentrate, so as to improve environmental conditions of the process by reducing the sulfur content in the precipitated manganese concentrate, before cleaning the solution by filtering into a pool ny fed circulating calcium dithionate solution in an amount to provide product concentrations of calcium ions and margan5 tsa equal to 174-195 r2 / n2 Table 1 52.0 2-40.0012 54.4 0.10 0.0012 Compiled N. Shevtsova Editor T. Lazarenko Tehred M. Didyk Proofreader I. Erdeyi Order 2507/27 Circulation 577 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Subscription