SU1587068A1 - Method of processing oxidized nickel-containing materials - Google Patents

Abstract

The invention relates to non-ferrous metallurgy, in particular, to methods for processing oxidized nickel-containing materials by the method of agglomeration and melting of the obtained agglomerate. The purpose of the invention is to improve the quality of sinter and reduce the consumption of solid fuel for sintering and subsequent smelting. Sintering is carried out using slag of ferrous metallurgy containing 2-5% fluorite as the main flux, with a particle size of 0.25-3 mm. Slag is introduced in the amount of 5-20% by weight of the charge. 5 tab.

Description

The invention relates to non-ferrous metallurgy, c. in particular, to methods of processing oxidized nickel-containing materials by the method of agglomeration and melting of the obtained agglomerate.

The aim of the invention is to improve the quality of the agglomerate and reduce the consumption of solid fuel for sintering and subsequent smelting.

Example. The tests of the method are carried out under laboratory conditions. The mixture for sintering consists of oxidized nickel ore, the return of agglomerate, limestone and ferrous metallurgy slag (the slag composition is given in Table 1) with the addition of solid fuels. As the last used coke breeze. The average particle size of the pelletized mixture is 3–4 mm, the content of hygroscopic moisture is 23–25%, and the hydrate moisture is 7–8%. Sintering is carried out in an agglomere with a diameter of 200 mm with a layer of 220

mm The charge is ignited by the combustion products of natural gas with a temperature of 1200 ° C for 2 minutes, which corresponds to the conditions of external heating of the charge in industry. The agglomerate is subjected to a strength test in accordance with a known technique and, in addition, its density is determined. Melting of the agglomerate is carried out in an electric resistance furnace in corundum crucibles with a diameter of 50 mm and a height of 100 mm. After melting the agglomerate, the melt is allowed to settle for 30 minutes, cool, separate the matte from the slag, and analyze the products.

The results of the influence of the ferrous metallurgy slag on sintering indices (the content in the slag (CaF 2.1%, modulus of basicity 3.4, fineness 0.3 mm) are given in Table 2, the results of the influence of fluorite content (CaP2) on the oxidized nickel ores in

SP

with

el cx vi o o o

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table 3, the results of the module influence on the main indicators of rework

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nickel ore (slag content of the World Cup 20%, CaP2 3.7%) - in Table 4, the results of the influence of the slag grain size of ferrous metallurgy on sintering indices - in Table 5.

The data of Table 2 shows that with the consumption of slag in the charge up to 5%, the effect of strengthening and compaction of the agglomerate is practically not observed. The strength and density of the agglomerate remain constant even with an increase in slag consumption of over 20%. However, the loss of nickel from the smelting slag increases from 1.32 to 1.33, 1.34 kg / t. Analysis of the effect of fluorite content in ferrous metallurgy slag / on the efficiency of sintering and smelting of ores (Table 3) indicates the need to limit its content to 2-5%.

When the CaP2 content is less than 2%, the loss of nickel with slags remains at the same level; when the CaP2 content is more than .5%, no loss occurs due to the improved quality of the agglomerate.

From Table 4 it follows that in order to preserve the losses of nickel with waste slags at the level of a known method, the modulus of the basicity of the ferrous metallurgy slag needs to be maintained over 3.0. Otherwise, Kai ecTBo of the agglomerate decreases and losses with waste slags increase.

The size of the ferrous metallurgy slag added to the mixture (Table 5) has a significant effect on the process of sintering. A reduction in particle size below 0.25 mm leads to a decrease in the vertical sintering rate, and consequently, to a decrease in the productivity of the agglomeration process. Increasing the slag size above 3 mm leads to a decrease in the density of the agglomerate due to the deterioration of sintering conditions. The use of the proposed method for the processing of oxidized nickel-containing materials provides an effective effect: by reducing the consumption of solid fuels and improving the quality of the agglomerate. As the data of Table 2 show, the proposed method allows to reduce the specific consumption of coke breeze for sintering from 175.8 to 1 64.5 kg / t of sinter by reducing the heat consumption of the charge when replacing lime with steel metallurgy slag.

Claims (1)

Claims The method of processing oxidized nickel containing materials, including their charge with solid fuel and main flux, sintering the resulting mixture and subsequent smelting of sinter, characterized in that, in order to improve the quality of sinter and reduce, the consumption of solid fuel for sintering and subsequent - smelting, specan1e are carried out using the ferrous metallurgy slag as the main flux in the amount of 5-20% by weight of the charge, having a basicity modulus (CaO —S-FeO) Si02 3 and containing 2-5% fluorite with particle size 0.25-3.0 mm. Table 1 table 2 Table 3 Table 4 Table 5