SU753791A1 - Method of ferric sulfide and oxidized mineral recovery from gold-containing ores - Google Patents

Description

(54) METHOD FOR INCOMING THE IRON OF SULFIDES AND OXIDIZED MINERALS FROM GOLD-CONTAINING ORES

The invention relates to the field of chemical phase analysis and can be used to determine the degree of oxidation of gold-containing 5 ores of low-sulphide formation during their

technological typing and industrial evaluation.

A known method for the selective separation of iron limonite, magnetite, fO hematite, ilmenite in the same ores l. This method can hardly be used in the analysis of gold-bearing ores, due to the specificity of their mineral composition.

A known method for determining the forms of iron in non-ferrous metal ores: abbreviated and complete or detailed 2.

With a reduced method, iron, the so-called acid-soluble minerals (oxidized iron minerals, pyrrhotite, chlorites,

siderite, magnetite) and sulfides (pyrite, chalcopyrite, bornite, arsenopyrite). With a full analysis, all forms of iron are determined, although the separation of iron from oxidized minerals from iron from chloriters and carbonates is not provided in the same way as in the narrow method. -3Q

The closest method is an abbreviated method for determining the forms of iron in non-ferrous metal ores.

With the contraction method, the analysis is performed from a single sample of the original ore. Initially, the sample is dissolved in hydrochloric acid with a density of 1.19 g / cm at reflux for 30 mn and iron acidic minerals are determined in the filtrate. The residue is further processed by heating 10 ml of nitric acid with a density of 1.4 g / cm, 10 ml of hydrochloric acid with a density of 1.19 g / cm 3 until the sample is completely decomposed, and the iron of sulphides is determined.

When applying the reduced method to gold-bearing ores due to the transition of carbonates and chlorites into iron hydroxide solution, along with iron oxides and hydroxides, rosite and scorodite, the amount of iron of oxidized minerals is overestimated, and, consequently, the degree of oxidation of ores. In particular, the known sulphides of RL5Y can be mistakenly attributed to oxidized or mixed. In the determination of iron

sulphides also result in distortion of the results, due to decomposition in a mixture of nitric and hydrochloric acid, in addition to sulfides of iron-containing hydromica

In order to determine the accuracy of iron sulfides and oxidized minerals in the presence of iron carbonates and chlorites, the analysis is carried out from two initial weights, by decomposing each under the same conditions in hydrochloric and nitrogen xxlotx; but; with a different sequence of alternating acids.

The concentration of acids and the conditions of dissolution are the same in all cases. Take 2.4-2.6 M NMO.}, At W 45-50: 1, t- 70-80 °, time 50-60 min hydrochloric acid 5-7 M, at W: T 45-50 : 1.1-95-100 °, time 2b-30 MMIK One clump of cng: the mixture is treated with an azftic acid. At the same time, iron sulfides, cap6c: -iats, chlorites, with an insignificant (less than 10%) dissolution of oxygenated

iron minerals. The filtrate is not analyzed, Sy1:) oh filter residue is dissolved in hydrochloric acid. 3, the filtrate determines the iron oxides and hydroxides of the iron, rosite and skorodite.

Another sample is first dissolved in hydrochloric acid. Iron passes to the solution of all iron-containing minerals with the exception of sulphides. The filtrate is not analyzed. The crude residue is dispersed with nitric acid and iron sulfides are determined. The results of the two final determinations allow a simple calculation to determine the degree of oxidation of the ores, in addition, they can be used to recalculate the mineral composition

P f: i and M E D.

i: i table shows the data of certain oxidized minerals and; Redl :: to the 5th method and for the RRL one of the places2, 200.07; -; 043.0

0.590.03 -; -: i866.0

3,980.30 + 1226.0

3,200,, 0

2,300,20s - ;; 050,0

1,400,20- () О О. ABOUT

1,300.2: -; -;) 8a, o

S. 7S ;; 32; vn. ii

. According to the proposed1 - /; in the way of the igigtsi carried out from two canopy ok (ruj O ,,)). One, a sample of pa.cJBOpeHa at the beginning of 2.5 M nitric acid:., At / K; T - HO: 1, t 70-80, for 60 min, the amount was not analyzed. The remainder of the races was created in hydrochloric acid 1; 1, with, t -, time 25 min. Iron oxide is defined in the filtrate: LenDruga hinge– mineralized minerals. in hydrochloric acid, when the same conditions were dissolved, as the first canopy, and the filtrate was not ana lized. The residue was decomposed with nitric acid (conditions as for the first sample) and iron sulfides were determined in the filtrate,

. According to the prototype, the sample was dissolved in hydrochloric acid with a density of

f -; T 50; during

1.19 g / s

PTZI

30 -iKi. In fi1: cost; The definition of iron is pa.cTBOpHVibiX minef.lov.

The residue was decomposed in 10 ml of nitric acid: an acid of DENSITY 1, with 10 gp of hydrochloric acid (1.19 g / s: m) added. Filtrate 3 determined by sulphides.

Ki-ric follows from the table, the results of the determination of iron oxidized by MDBpajiOB by a known method (prototype) are sharply overestimated in comparison with the results of the proposed method, for. by dissolving ferrous carbonates in hydrochloric acid. These definitions of iron sulfides also for EbEi-exT .i when analyzed by a known method, due to decomposition in a mixture of nitric hydrochloric acid-i

Claims (3)

gmdroslyud. The proposed method makes it possible to accurately determine the iron determinations of oxidized minerals and sulfido as a result of the exclusion of carbonates from the analysis of iron, which are equally soluble in 2.4–2.6 m of nitric and hydrochloric (5–7 m) acids and replace the acid mixture (nitric acid). and hydrochloric) in the isolation of iron sulphides with one selectively active nitric acid. Since that each sample is analyzed only the final filtrate, the performance of the method remains high (5-6 samples per working day). The reliability of the definitions according to the proposed method is confirmed by the high convergence of data with recalculations of mineralogical analysis. Claims The method for separating iron sulphides and oxidized minerals from gold-bearing ores, for their subsequent determination, includes selectively dissolving minerals in hydrochloric and zothic α-X1 acids in the ratio of liquid and solid phases G: T 45-50: 1 and heating, differing by that that, in order to improve the determination accuracy in the presence of iron, carbonates and chlorites; The analysis is carried out from two weights, with one sample being treated with 2.4-2.6 M nitric acid at 70-80 ° C for 5060 minutes, and the crude residue is treated with 5-7 M hydrochloric acid at 95-100® C for 25-30 minutes and in the filtrate iron of oxidized minerals is determined, another sample is first treated with hydrochloric acid; and the residue with nitric acid under the same conditions and in the filtrate determine the iron of the sulfides. Sources of information taken into account in the examination 1. Phase chemical analysis of ores and minerals. LSU, 1962, p. 109-131. 2. Filippova N.A. Phase analysis of ores. Metallurgists, 1964, p. 178-183. 3. Filippova N.A. Phase analysis of ores and their products. M., Himi, 1975, p. 243-247 (prototype).