RESEARCH OF PROCESSES OF DETERMINATION OF GOLD CONTENT IN PRODUCTS OF GOK "NEVSKY" LLC "DRUZA"

ИССЛЕДОВАНИЕ ЭФФЕКТИВНОСТИ МЕТОДОВ ОПРЕДЕЛЕНИЯ СОДЕРЖАНИЯ ЗОЛОТА В ПРОДУКТАХ ГОК «НЕВСКИЙ»

Научная статья

Истомина Е.Е.^1, *, Хаташкеев А.В.²

¹ ORCID: 0000-0002-1243-4434;

² ORCID: 0000-0003-0304-6162;

^{1, 2} Иркутский государственный университет, Иркутск, Россия

* Корреспондирующий автор (gamlet421[at]yandex.ru)

Аннотация

В статье рассмотрены методы определения содержания золота в продуктах ГОК «Невский» ООО «Друза». Проведено исследование деятельности по определению содержанию золота в золотосодержащих продуктах. Рассмотрены методы определения содержания золота в продуктах на базе ПАЛ и ЗИФ компании. В работе описаны методы определения содержания золота в продуктах: атомно-абсорбционный метод, титриметрический метод и пробирно-гравиметрический метод. Определен более эффективный метод определения содержания золота в продуктах золотодобывающей компании.

Ключевые слова: золотоизвлекательная фабрика (ЗИФ), пробирно-аналитическая лаборатория (ПАЛ), слиток золота, проба, золотосодержащая руда, методы определения содержания золота: пробирно-гравиметрический.

RESEARCH OF PROCESSES OF DETERMINATION OF GOLD CONTENT IN PRODUCTS OF GOK "NEVSKY" LLC "DRUZA"

Research article

Istomina Е.Е.^1, *, Shataschkeev А.V.²

¹ ORCID: 0000-0002-1243-4434;

² ORCID: 0000-0003-0304-6162;

^{1, 2} Irkutsk State University, Irkutsk, Russia

* Corresponding author (gamlet421[at]yandex.ru)

Abstract

The article deals with the processes of determining the gold content in the products of the "Nevsky" mining and processing plant of "Druza" LLC. The activity of AAL to determine the content of gold in gold-containing products was investigated. The composition and structure of AAL GOK "Nevsky" LLC "Druza" is considered. The paper describes methods for determination of gold such as atomic absorption, titrimetric analysis and gravimetric method. The principles of internal and external laboratory control in the AAL of a gold mining company are defined.

Keywords: gold recovery factory (GRF), assay and analytical laboratory (AAL), gold bar, sample, gold-containing ore, methods for determination of gold content: gravimetric.

Introduction

When developing precious metal deposits in East Siberia, there is an urgent need to apply methods that made it possible to carry out the quantitative determination of gold. Using other methods, researchers were faced with a problem of unrepresentative suspension and the ability to conduct only a semi-personal analysis of the gold content in ore [1, P. 7-8], [10]

The methods are used to determine the gold content of Nevsky products:

1. Test tube smelting of enlarged ore suspension is used for analiz ores with coarse gold in the plant of Nevsky.
2. The method of cyanidation of enlarged ore canopies is used in plant.
3. The method is used by mining and processing plant of Nevsky, but the weight of the suspension for sieve analysis is limited to 1kg, which is insufficient for gold-bearing ores of no objects. [2], [6]
4. The most promising is the extraction of free gold particles by gravitational methods with the production of gold-containing concentrate and tailings. Collection, crushing, mixing and reduction of initial samples to cereals - 2 mm [2], [3].
5. The mass of the sample representative for analysis depends on the size of gold and its content in the ore. It is recommended to take a sample mass of at least 4 kg after crushing the ore to a size of - 2 mm. Reduction of samples during crushing is carried out in accordance with the Richards-Chechott formula

      (1) md – is the mass of the sample at this stage of its reduction; K – is a coefficient depending on the size of gold, the unevenness of its distribution in ore and the uniformity of ore (the value of the coefficient K=1.0). d – maximum diameter of ore pieces, mm. α-index of the degree of approximation of the shape of ore grains to spherical (recommended value – 2).

6.It is recommended to crush samples in cheek crushers with glade cheeks. After crushing to a size of - 2 mm, a sample weighing 4 kg goes to crushing to a size of 50-60% of the class - 0.1 mm. After the first stage of grinding, the sample is reduced to 1 kg and then is trimmed to a size of 95-98% of the class - 0.1 mm.

7. Reduction of material at all stages of sample processing is preferably carried out with the help of mechanical abbreviators, which ensure uniform supply of material and sampling by transverse intersection of the whole jet by a sampling device with a number of cuts of at least 40 minutes.
8. During sampling and processing it is necessary to ensure safety conditions in accordance with the requirements of GOST 14180-80.
9. The mass of the ground sample supplied to the control screening on the screen 0.007 (0.1) mm must be not less than 1 kg (OST 48-276-86). Screening is carried out in a wet manner, which is preferable to screening dry.Screens after screening shall be cleaned in ultrasonic baths.
10. Desirably, the weight of the resulting oversize products does not exceed 50 g, i.e., the weight of the single test tube slurry. The oversize product containing the free gold particles is weighed and sent in its entirety to a test tube. In case the whole concentrate mass cannot be melted by one test tube, several melts are carried out.
11. After weighing the sub-sieve product, samples (50 g) are taken from it to determine the gold content by test tube analysis.

The gold content of the concentrate is determined by the test method. The total mass of concentrate (about 50 g) is fed to the test tube smelting. Provided that a higher mass concentrate is obtained, several test tubes are required. Then the average-weighted gold content in the concentrate is calculated.

    (2) µ1 – gold content in the analysed ore is calculated, where gold content in the analysed ore; β1 – mass of the analysed ore; µ2 – gold content in the concentrate; β2 – gold content in the tails of gravity. The results of the work performed allow for the following conclusion. The uneven distribution of gold in preparation for test analyses of samples of gold ore deposits leads to a mismatch of its co-holding in the canopies for test analysis with the true content in the test sample. Increasing the weight of the canopies and preliminary isolation of large gold from them allows reducing or completely eliminating the effect of non-uniform distribution of gold on the results of its definitions. As a result, the coefficient of variation of definitions was significantly reduced and the precision of the analyses was increased, but no data on the validity of applying increasing correction coefficients to the results of the test tubes had been obtained for any of the studied objects. In this regard, when identifying a stable tendency to increase the gold content in analytical samples when comparing the results of test tests and the results obtained during the analysis of enlarged canopies with the preliminary release of large gold, first of all, it is necessary to pay attention to possible systematic errors in the preparation and analysis of ore samples. The minimum mass of the coarse gold preemption analysis canopy is determined for each object depending on the coarse gold. During mass analysis, it is recommended to perform analysis of canopies weighing about 4 kg [5]. This makes it possible to quickly prepare and analyze samples according to a simple process scheme with a minimum number of operations, without excluding the possibility of adjusting the mass of the hinges depending on the essential composition of the ores.  

Table 1 – Results of calculation of gold content in samples with large metal emissions in ore of Nevsky deposit

Sample number	Oversized product (0.1 mm)			Sub-sieve product (-0.1 0mm)			Calculated content in initial sample g/t
	substance yield		Au content, g/t	substance yield		Au content, g/t
	G	%		g	%
1	1,430	0,144	1497	976,2	99,87	2,04	4,81
2	2,625	0,263	854	956,5	99,76	3,8	5,62
3	0,867	0,087	91,3	998,9	99,79	1,63	1,77
4	2,247	0,236	76,2	1098,9	99,98	1,89	1,98
5	5,782	0,582	25,3	956,8	99,87	0,97	1,08
6	5,760	0,579	38,1	1001,2	99,34	1,33	1,64
7	7,521	0,755	472	1056,6	99,67	2,31	5,89
8	3,102	0,323	781	1105,7	99,77	3,89	5,88
9	2,846	0,293	2198	1001,8	99,71	6,81	11,9
10	3,706	0,397	187	998,5	99,65	3,32	3,89

Note: compiled by [4], [7], [8], [9]  

In the table 1 shows the weights of gold oversized products when screening on a 0.1 mm sieve, from which two 40 g weights were allocated for analysis, respectively. The estimated gold content in the initial ore is determined based on the results of calculation of the substance balance. Analysis of the results indicates that the gold concentration is several times higher in the oversized product of the grinding of the ground sample than in the undersized product.

In the oversized product, native gold can be observed in the form of cha-stems with a size of 0.5-0.6 mm, at 45-60% of the gold content of the total metal in the samples. Extraction of metal into oversize product up to 10%.

The methodology of gravitational concentration showed its effectiveness in the search, exploration and technological assessment of ores of many objects, including deposits.

Конфликт интересов Не указан.

Conflict of Interest None declared.

Список литературы / References

1. Мир химии. Аналитический контроль благородных металлов / Под ред. Ю.А. Карпова, В.Б. Барановской, Л.П. Житенко. – М.: Техносфера, 2019.
2. ОСТ 48-276-86 Руды и концентраты цветных металлов с попутным содержанием благородных металлов. Отбор и подготовка проб для определения содержания благородных металлов и влаги. – М.: Стандартинформ, 1987, 17 с.
3. ГОСТ 14180-80 Руды и концентраты цветных металлов. Методы отбора и подготовки проб для химического анализа и определения влаги. – М.: Стандартинформ, 1980, 20 с.
4. СК-РЖ-7.11-2017 Журнал регистрации результатов испытаний технологических проб ЗИФ / Н.В. Аксенова. ГОК «Невский», Бодайбо, 2017 – 5 с.
5. Истомина Е.Е. Исследование процессов определения содержания золота в продуктах ГОК «Невский» ООО «Друза» / Е.Е. Истомина, А.В. Хаташкеев // Международный научно-исследовательский журнал. - №7(97) часть 1. – 2020 – С.178-181
6. ГОСТ 8.010-2013 Государственная система обеспечения единства измерений (ГСИ). Методики выполнения измерений. Основные положения. М.: «Стандартинформ», 2019. 36 с.
7. СК-РЖ-7.13-2017 Журнал регистрация выданных протоколов результатов испытаний проб карьера, МСИ, внешних заказчиков. // Н.В. Аксенова ГОК «Невский» ООО «Друза», Бодайбо, 2017 – 5 с.
8. СК-РЖ-7.14-2017 Журнал учета расхода реагентов, материалов // Н.В. Аксенова ГОК «Невский» ООО «Друза», Бодайбо, 2017 – 5 с.
9. Результаты определения золота в слитках 2017 / Н.В. Аксенова. ГОК «Невский» ООО «Друза», Бодайбо, 2017 – 2 с.
10. Истомина Е.Е. Об управлении качеством при проектировании и разработке изделия из пенополиуретана / Е.Е. Истомина // Компетентность 2019 – №5. – C. 46-48.

Список литературы на английском языке / References in English

1. Mir himii. Analiticheskij kontrol' blagorodnyh metallov [The world of chemistry. Analytical control of precious metals] / Edited by Yu. A. Karpov, V. B. Baranovskaya, L. P. Zhitenko. - M.: Technosphere, 2019. [in Russian]
2. OST 48-276-86 Rudy i koncentraty cvetnyh metallov s poputnym soderzhaniem blagorodnyh metallov. Otbor i podgotovka prob dlya opre-deleniya soderzhaniya blagorodnyh metallov i vlagi [Ores and concentrates of non-ferrous metals with an associated content of precious metals. Sampling and preparation of samples for determining the content of precious metals and moisture]. - Moscow: Standartinform, 1987, 17 p. [in Russian]
3. GOST 14180-80 Rudy i koncentraty cvetnyh metallov. Metody otbora i podgotovki prob dlya himicheskogo analiza i opredeleniya vlagi [Ores and concentrates of non-ferrous metals. Methods of sampling and preparation of samples for chemical analysis and determination of moisture]. - M.: Standartinform, 1980, 20 p. [in Russian]
4. SK-RZh-7.11-2017 ZHurnal registracii rezul'tatov ispytanij tekhnologicheskih prob ZIF [Journal of registration of test results of technological samples of ZIF] / N. V. Aksenova. GOK "Nevsky", Bodaybo, 2017 – 5 p. [in Russian]
5. Istomina E. E. Issledovanie processov opredeleniya soderzhaniya zolota v produktah GOK «Nevskij» OOO «Druza» [Study of the processes of determination of gold in the products GOK Nevskiy, OOO Druza] / E. E. Istomina, A. V. Atascii // Mezhdunarodnyj nauchno-issledovatel'skij zhurnal [International Research Journal]. - №7(97) part 1. – 2020 – p. 178-181. [in Russian]
6. GOST 8.010-2013 Gosudarstvennaya sistema obespecheniya yedinstva izmereniy (GSI). Metodiki vypolneniya izmereniy. Osnovnyye polozheniya [State system for ensuring the uniformity of measurements (GSI). Methods of performing measurements. Basic provisions]. M.: "Standartinform", 2019. 36 p. [in Russian]
7. SK-RZH-7.13-2017 Zhurnal registratsiya vydannykh protokolov rezul’tatov ispytaniy prob kar’yera, MSI, vneshnikh zakazchikov [Journal registration of issued protocols of test results of samples of quarry, MSI, external customers]. / N. V. Aksenova GOK " Nevsky "LLC " Druza", Bodaibo, 2017-5 p. [in Russian]
8. SK-RZH-7.14-2017 Zhurnal ucheta raskhoda reagentov, materialov [Journal of accounting for the consumption of reagents, materials] / N. V. Aksenova. GOK " Nevsky "LLC " Druza", Bodaibo, 2017-5 p. [in Russian]
9. Rezul’taty opredeleniya zolota v slitkakh 2017 [Results of the determination of gold in bullion 2017] / N. V. Aksenova. GOK " Nevsky "LLC " Druza", Bodaibo, 2017-2 p. [in Russian]
10. Istomina E.E. Ob upravlenii kachestvom pri proyektirovanii i razrabotke izdeliya iz penopoliuretana [On quality management in design and development of products made of polyurethane foam] // Kompetentnost’ – 2019 – No. 5. – P. 46-48. [in Russian]