SU821516A1 - Charge for agglomeration annealing of sulfide copper-nickel concentrates - Google Patents

Description

The invention relates to metallurgy, in particular to the preparation of concentrates, for example, copper-nickel sulfide, to pyrometallurgical processing.

The known charge for the agglomeration roasting of sulphide interstitial. concentrates containing lime as an intensifying additive with a content of 1-5% by weight. i The disadvantages of this mixture are relatively high cost, low desulfurization due to the formation of calcium sulfate. At the same time, lime does not provide the necessary speed of the process while reducing the silica content in the concentrate.

Also known is the charge for the agglomeration roasting of sulphide meano-nickel concentrates containing sulphide copper-nickel concentrate and an intensifying additive, as used for hydrosilicate sludge with a content of 2-6% by weight in the mixture 2.

The disadvantage of this mixture is that the addition of sludge increases its cost and does not provide the necessary degree of intensification of the firing process.

The purpose of the invention is to increase productivity and reduce the cost of the firing process.

The goal is achieved by the fact that, as an intensifying additive, the mixture contains argillite in the following ratio of components, cpc.%: Sulfide copper and nickel concentrate 96, 0-99.5 Argillite 0.5-4.0 Argillite (tuffargillite) is a hard rock-like rock, It is composed mainly of minerals of the hydromucrostomorillone and chlorite types. For example, kaolinite, montmorillonite, hydromica, siderite, ankerite, volcanic glass, chlorite, garnet, zircon, sphene, colloform ferrous products, goethite, gyrohegite, impurities of carbonaceous matter are noted in the argillites of the Norilsk region. The proposed blend was tested in laboratory conditions. Norilsk argillite is used to prepare the charge. In preparing the mixture, the mixture is thoroughly mixed in a mixer and is poured into granules with a moist recycle sinter, supplied in an amount of 150% by weight of the concentrate. The silica content in; each charge is maintained by a constant (7.5%) change in the ratio of the number of concentrates No. 1 and M 2. The chemical compositions of the concentrates and additives are given in table. 1. Firing is carried out in an aglochash with an internal diameter of 193 mm. The initial vacuum in the system 1OOO mm Hg. Art., flow rate 2 air 26 m / m min. bed height 23O + 5 mm. The influence of particle size (Table 2 on the amount of argillite (Table 3) in the charge on agglomeration indicators is investigated. Experimental results show that the addition of argillite improves the performance of the sintering process, and the initial particle size of the additive does not play a significant role The critical effect of argillite appears already at its 0.5% content in those (Table 3) and increases with an increase in the amount of the additive to 4%. A further increase in the content of the argillite does not cause a significant increase in the productivity of the process. about 4% of the addition of argillite with a particle size of minus 3 m provides an increase in sulfur burnout productivity by 5.2% compared to the achieved 6% -coA clay additive (the best intensifier from hydroxy silicate sludge) and by 28.3% compared to effect 4 % lime (industrial intensifier). The positive effect of argillite on the agglomeration process seems to be explained as follows. This solid rock-like rock consists of compacted and cemented dispersed mineral particles, about 50% of which are less than 0 fraction. , 005-0.01 mm. Under the action of moisture and agitation during granulation, large granules of granules disintegrate into dispersed components, which promote hardening of the granules of the charge, and during calcination they stimulate the formation of mobile silicate phases, which improve the oxidation of sulfide concentrates. The obtained results show that for industrial use of the proposed mixture, crushing of the mudstone to a particle size of minus 3-5 mm with its 0.5–4% additive is sufficient. By varying the amount of circulating sinter in the range from 50 to 250% by weight of the concentrate in the proposed mixture, as in the known, the required sulfur content in the mixture is achieved. Along with the intensification of the agglomeration process, the use of argillite reduces the cost of the process. The advantages of the proposed blend consist in a stronger intensifying effect of argillite on the agglomeration process with a lower content in the charge than any kind of hydrosilicate sludge, which reduces the degree of thinning of the charge; low cost of flux; the presence of large reserves without significant fluctuations in chemical composition (in the Norilsk region, for example, mudstones compose a thickness of up to ZO-4O m), enabling long-term planning of the optimal composition of the charge; the simplicity of preparation for the introduction into the mixture - it is enough to crush to a particle size of minus 3-5 mm and there is no need to control the particle size distribution; the possibility of operational impact on the course of the sintering process (by changing the amount of the additive with a change in the composition of the concentrate) when argillite is introduced into the charge directly at the sinter plant. In addition, the technology for the preparation of the proposed charge and sinter firing does not change as compared with that used for the known charge, therefore, its implementation is not associated with additional equipment and development costs. The proposed charge can be used both when operating sintering machines with blast and with air proc, including also the use of oxygen-enriched blowing and steam-air blowing.

Chemical compositions of raw materials

 Table 1

Copper-nickel 2, 79 42,1327,09 sludge concentrate 5.89 M eano-nickel concentrate 5, PA 3.29 52.7533.94 Norilsk ap9, 110.20 gillite - -Live Norilsk clay Effect 4%. oh csavki of argillite of various size to concentrate on agglomeration indicators

Table-2 9.5О2.87 2.962.561, 45O, 8O O, 54O, 57 55,41.24 1.9917,719.65 4.4571.27 .1.29 1.0716.73 44.71 6.85 5, 37 15.35 9.24

Dependence of agglomeration indicators on the content of argillite with a particle size of minus 3 mm in the mixture

Without additive26,87,7452,65,26

With 4% -fioK additive

lime 29,27,9151,45,40.

Claims (2)

With 6% additive The invention formula for agglomerative roasting of sulphide copper-nickel concentrates, containing a sulphide copper-nickel concentrate and an intensifying additive, in order to increase productivity and reduce the cost of the roasting process, as an intensifying additive, argillite in the following ratio of components, wt.%: Table 3 Sulfide copper-nickel concentrate of 96.0-99.5 Argillite, 5-4.0 Sources of information taken into account during the examination 1. S. Rakhlin, Belousova V. T. and Batischeva T, A, Sulfide copper agglomeration - Iron concentrate, Ore beneficiation, No. 4 (88), 1970, P.24-.26. 2. USSR author's certificate according to the application N 2604061 / 22-02, cl. From 22 to 1/16, 1977.