SU1497252A1 - Method of reprocessing manganese carbonate ores - Google Patents

Abstract

This invention relates to the chemical technology of manganese. The purpose of the invention is to intensify the process by increasing the filtration rate, improving the quality of the resulting products. The method of processing manganese carbonate ores includes nitric acid leaching, bringing the pulp to PH = 3-4 by introducing ammonia, filtering and precipitating carbonate from the manganese solution, while leaching is carried out in the presence of ammonium sulfate in the amount of wt. 25% of ore. The filtration rate is increased 8 times, and all the resulting products are suitable for use in the production of building materials, fertilizers and animal feed.

Description

This invention relates to the chemical technology of manganese.

The purpose of the invention is to intensify the process by increasing the filtration rate.

Example. The experiments were carried out on carbonate ore containing,%: MpO 28,32; MnOj 2.05; CaO 9.46; MgO 1.92; 1.86; , 1.65; CO, 25.6; SiOj 21.26.

2.2 l of 45% nitric acid is added to 1.2 kg of carbonate ore, which is 105% of the stoichiometry with respect to all acid-soluble components of the ore. In the leaching process, 300 g of crystalline ammonium sulphate is added, which is 25% may. from ore. By

Upon completion of the leaching processes, the slurry is neutralized with ammonia gas to pH 4.0 and filtered. The filtration rate for the liquid phase is 400 l / m i h (gu 150l / m h is known). The precipitate is washed twice with water by pulpation at T: W 1: 1, the resulting streams are mixed with the filtrate, and the slurry is calcined at 1100 ° C. The resulting solution in an amount of 5 liters, containing, g / l: PP 55,0; Ca 1.50; Mg 2.38; 122, P, is subjected to conversion with gaseous COj and W. The resulting precipitate of manganese carbonate is filtered, washed, dried at 110 C. The filtrate and the 7.5 liters of liquid are represented by {a salt nitrate with insignificant at 4: 1

WITH

sl

to

ate

Yu

months of calcium, magnesium and manganese in the form of nitrates.

As a result of the experiment received:

slime in the amount of 545 g with the content of basic substances,%: Mn - 2.69; Ca 12.07; SiO 48.30; 2.89; A1aOz 3.87;

-manganese carbonate in the amount of 600 g with the content,%: Mp 44,54; Ca 0.2; Mg 0.36,

- ammonium nitrate solution in the amount of 7.5 l with the content, g / l 174.2; Mp 0.30; Ca 0.97;

Mg 2.1. Manganese 6 conversion. The final product is 93%.

The effectiveness of the method is that the filtration of the suspension is improved. Waste-free technologists are created, since all the products obtained are used. So, primary sludge, consisting mainly of silica and gypsum, can be

used in the production of building materials, manganese carbonate - in feed production for the correction of electrolyte in the production of EDM, to obtain manganese concentrates and other manganese compounds, ammonium nitrate solution - as fertilizer.

Claims (1)

Invention Formula A method of processing manganese carbonate ores, including nitric acid leaching, bringing the pulp to a pH of 3-4 by introducing ammonia, filtering and precipitating carbonate from a solution of manganese in order to intensify the process by increasing the filtration rate, improving quality of the resulting products, leaching is carried out in the presence of ammonium sulfate in an amount of 25% by weight of ore.