RU2360987C1 - Purification method of ferromanganese raw materials from phosphorous - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: method includes grinding of raw materials up to fineness less than 0.074 mm. After grinding it is implemented leaching during 20-40 minutes at temperature 40-50°C 0.5-1.0 "н." by solution of oxalic acid at relation of liquid to solid in pulp 3:1 with transferring of phosphorus into solution. After leaching it is implemented pulp filtration.

EFFECT: selective dissolution of phosphorus from raw materials.

2 tbl, 1 ex

Description

The invention relates to the metallurgical industry, in particular to the preparation of ferromanganese raw materials for smelting, and can be used to purify raw materials from phosphorus.

Known pyrometallurgical method of smelting low phosphorous manganese slag from high phosphorus ores [1, p. 220]. The essence of the method is to prepare a mixture containing a high phosphorus manganese concentrate, coke, metal shavings or scrap metal, followed by melting the mixture in an electric furnace. When smelting get high phosphorous associated metal and manganese slag. Associated metal with a high phosphorus content is not used. Low phosphorus slag instead of manganese concentrate is used for the smelting of manganese and manganese alloys. The disadvantages of the method lies in the complexity and high cost of the metallurgical operation - melting the charge with a high consumption of coke, electricity, metallurgical shavings (scrap metal). Large losses of manganese and iron with associated metal, which is stored in dumps, as it is a waste of production.

The closest is the method [1, p. 221-257] leaching at 0.5 N. nitric acid with a ratio of T: W = 1: 3 cake obtained by roasting a phosphorus concentrate with soda, with a dosage of 400 grams per 1 kilogram of concentrate. Sintering is carried out at 850-900 ° C for 1 hour. When the cake is leached with nitric acid, phosphorus is extracted into the solution. The phosphorus content in the processed concentrate is reduced from 0.35% to 0.12%. The disadvantage of this method is the multi-stage process, the use of expensive, scarce, aggressive reagents. High heat consumption for the operation of sintering the mixture, high energy consumption.

The problem solved by the invention is to simplify the technology, reducing the consumption of reagents, energy, reducing the amount of production waste, improving the quality of the processed concentrate.

The technical result achieved by the implementation of the invention is to optimize the size of the raw materials, the concentration and consumption of the reagent, the density of the pulp, temperature and duration of leaching.

To achieve the technical result provided by the invention in a method for purifying concentrates and ores from phosphorus, including grinding the raw material, leaching it with subsequent filtration, grinding the raw material to a particle size of less than 0.074 mm, it is leached for 20-40 minutes at a temperature of 40-50 ° C 0.5-1 n a solution of oxalic acid in the ratio of solid to liquid in a solution of 1: 3, followed by filtration of the pulp. The amount of phosphorus in the final product is reduced from 0.35% to 0.06%.

The essence of the claimed invention lies in the fact that instead of multi-stage technologies using expensive, scarce, aggressive reagents of soda and nitric acid, a new method is proposed for purifying phosphorus from ores and concentrates, including grinding the feedstock to a particle size of less than 0.074 mm, followed by leaching it for 20- 40 minutes at 40-50 ° C 0.5-1.0 N. a solution of oxalic acid with a liquid to solid ratio of 3: 1, followed by filtration of the pulp. The concentration of phosphorus in the processed concentrate decreased from 0.35 to 0.06%.

Example.

For research, we used iron and ferromanganese ores and manganese concentrate from ores of the Uvat group of deposits in the Irkutsk region. The composition of the ores and concentrate are shown in table 1.

To obtain low-phosphorus ores and concentrates, the samples are dried in a muffle at 115 ° C, ground in a laboratory ball mill to a particle size of less than 0.074 mm. An aqueous solution of oxalic acid is prepared, heated to a predetermined temperature in a thermostat, a milled sample of the concentrate is added, and leached with continuous stirring of the pulp and a given agitation time. At the end of the experiment, the pulp is filtered through a paper filter and dried at 115 ° C. The solid residue is abraded in an agate mortar and analyzed for phosphorus according to the procedures described in [2]. Leaching conditions are shown in table 2, from which it follows that according to the proposed method, the phosphorus content in iron and ferromanganese ores and manganese concentrate is reduced to 0.06-0.08%.

Table 1 Material Chemical composition, wt.% Mn Fe R Manganese Concentrate 51.7 0.35 Iron Manganese Ore 18.9 15.7 0.26 Iron ore 34,4 0.32

table 2 Material (processing method) Experience number The phosphorus content in the ore (concentrate),% The characteristics of the experiments The phosphorus content in the solid residue, wt.% The concentration of oxalic acid in solution (normality), n. The ratio of T: W in the pulp Pulp temperature, ° С Leaching time, min Manganese concentrate (by the proposed method) one 0.35 1,0 1: 3 fifty 60 0.06 2 0.35 0.5 1: 3 fifty 60 0.06 3 0.35 1,0 1: 3 40 60 0.06 four 0.35 0.5 1: 3 40 thirty 0.08 5 0.35 0.5 1: 2 40 thirty 0.09 6 0.35 0.75 1: 3 45 45 0,07 7 0.35 0.75 1: 4 45 45 0.06 Iron-manganese ore (by the proposed method) 8 0.38 0.7 1: 3 45 45 0.08 9 0.38 1,0 1: 3 fifty 60 0.06 10 0.38 0.5 1: 3 40 thirty 0.08 Iron ore (by the proposed method) eleven 0.28 0.5 1: 3 40 thirty 0,07 12 0.28 1,0 1: 3 fifty 60 0.06 According to the prototype manganese concentrate 13 0.35 1.0 nitric acid 1: 3 90-95 Aging in solution and agitation 8.5 hours 0.1-0.13

Information sources

1. Gasik M.I., Lyakishev N.P., Emlin B.I. Theory and production technology of ferroalloys // M., Melallurgy, 1988.

2. Stepin VV, Silaeva EV, Kurbatova V.I., Fedorova ND, Ponosov V.I. Analysis of ferrous metals, alloys and manganese ores. M., State Scientific and Technical Publishing House of Literature on Ferrous and Non-Ferrous Metallurgy, 1964, p. 438.

Claims (1)

The method of purification of ferromanganese raw materials from phosphorus, including grinding the raw material, leaching it and subsequent filtration, characterized in that the grinding is carried out to a particle size of less than 0.074 mm, leaching is carried out 0.5-1.0 N. a solution of oxalic acid for 30-60 minutes at a temperature of 40-50 ° C with a ratio of liquid to solid in the pulp 3: 1.