Example of copper-molybdenum ore dressing plant of Balkhash mining and metallurgical joint venture in Kazakhstan

1 Introduction

The Balkhash Mining and Metallurgical Joint Venture is located in Kazakhstan. A total of two selection plants: copper selection plant and molybdenum selection plant.

The copper processing plant processes the ore of the Kornrad porphyry copper deposit and the CafIKCK deposit to produce a copper-molybdenum mixed concentrate.

The molybdenum plant is used to treat the copper-molybdenum mixed concentrate of the East Cohenrad molybdenum ore and copper ore plant; it also processes the molybdenum-containing products from the Almarek and Akzadsk selection plants.

In 1938, the Balkhash copper plant was put into production and began to choose copper. In 1941, the Balkhash molybdenum plant was put into production and began to select molybdenum. From 1959 to 1975, after several expansions, the existing production capacity has reached 44kt / d ore processing.

2. Deposits, ores and mining

Kornlad is a porphyry copper deposit with 91% of reserves and 9% of off-balance sheet reserves. The ore in the table is classified into Class I and Class II. â…  level depths sulfide ore deposits, mainly metallic minerals chalcopyrite, pyrite, bornite, chalcocite, the main non-metallic minerals are quartz, feldspar, sericite. Grade II is the mixed ore (oxidized ore, sulfide ore) in the upper part of the sulfide ore. Copper oxide accounts for about 30% of the total copper. The copper oxide minerals include malachite, azurite, cyanite, and water cholesterium. The gangue-containing kaolin is easy to mud. The average grade of the Kornrad ore is 0.57% Cu, 0.01% Mo.

The main metal minerals in the East Cohenrad ore are: molybdenite, molybdenum-tungsten ore, pyrite, etc. The main non-metallic minerals are: quartz, sericite and so on. The Kornlad chalcopyrite is uniformly impregnated with fine particles and has a particle size of 0.01 to 1.0 mm. The main mineral in the East Coendade molybdenum ore is molybdenum ore, and the amount of molybdenum oxide is small.

Cohenrad uses an open pit mining process and East Cohenrad uses a pit mining process.

3. Mineral processing technology

The copper-molybdenum ore beneficiation process is complex and can be divided into three sections: copper-molybdenum mixed flotation, producing copper-molybdenum mixed concentrate; copper-molybdenum sorting, producing copper concentrate (in-tank product) and crude molybdenum concentrate Mine (foam product); crude molybdenum concentrate enters the selective process of molybdenum ore flotation circuit, and finally qualified molybdenum concentrate.

The crushing operation uses a three-stage open-circuit crushing process. The process of copper-molybdenum mixed flotation is shown in Figure 1. The ore is coarsely ground in two stages, and the fineness of the product is 60%-200 mesh. After a rough selection, a sweeping selection, three selections, and a selective concentrate regrind process, a copper-molybdenum mixed concentrate is obtained.

Figure 1 Balkhash copper-molybdenum mixed flotation process

Balkhash mixed flotation, concentrated demineralization of tailings (which contains only 0.04% of copper), and the ore is then subjected to one rough selection, one sweep, medium mine regrind and two selections. Desliming, re-grinding and re-election of tailings have improved the recovery rate of copper and molybdenum. Its products are incorporated into copper-molybdenum mixed concentrates.

The copper-molybdenum sorting process is shown in Figure 2. After the copper-molybdenum mixed concentrate is concentrated, sodium sulfide is added, and after steaming at (75 ° C), it is subjected to one rough selection, one sweep, three selections, one fine sweep separation, and sodium sulfide is added during the flotation process. (Na ₂ S) inhibits copper minerals and blows steam directly into the flotation cell. Qualified copper concentrate and crude molybdenum concentrate can be obtained by sorting.

Molybdenum ore selection: The oxidation rate of molybdenum in the East Coendade ore is relatively high. The oxidized minerals such as oleic acid are added to the tailings of the molybdenum sulfide. The crude molybdenum concentrate obtained from the separation of copper-molybdenum and the molybdenum products produced by the Alma Lake, Akzadsk selection plant, and the molybdenum oxide flotation section are also included in the molybdenum selection section. The final molybdenum concentrate is obtained after three more selections. The process is detailed in Figure 3.

Figure 2 Balkhash copper-molybdenum sorting process

Figure 3 Balkhash molybdenum beneficiation process

4. Mineral processing agent

The mineral processing plant pharmacy system is listed in the table below.

Table Balhas Concentrator Chemicals System

1 consumption per ton of concentrate.

Due to the use of mixed hydrocarbon oil (transformer oil and industrial oil,) (д) engine oil, kerosene) and OПCБ, T-66 foaming agent and combination collector (butyl xanthate and isopropyl xanthate and the ratio of 3 : 2 is better) to promote the improvement of production indicators.

5, production indicators

The ore grade is 0.57% Cu, 0.01% Mo, the grinding fineness is 60%-200 mesh, the ore processing capacity is 34 kt/d; the copper-molybdenum mixed concentrate (copper selection plant concentrate) grade 17%~18% Cu, 0.1 %~0.15%Mo; recovery rate 88%~90%Cu, 60%~65%Mo; copper concentrate grade 23% Cu, actual recovery rate 85% Cu; molybdenum concentrate grade 51%~52%Mo, copper- The recovery rate of molybdenum separation molybdenum operation is 92%~94%. Total recovery of molybdenum is 55%~61%Mo; power consumption: 24.79kW·h/t mine of copper plant, 15.3kW·h/t mine of molybdenum plant; water: 2.68m ³ /t mine of copper plant, aluminum Factory 1.99m ³ /t mine.

6. Some new developments

The demineralization of the tailings, together with the addition of 50g/t hydrocarbon oil, the re-grinding and selection of the foam products can increase the copper recovery rate by 3% and the molybdenum by 4%. Copper sulfate was added to the copper-molybdenum mixed selection, and the molybdenum recovery rate was increased by 5%. Heating and aerating with steam, steam entering each flotation tank can reduce the consumption of sodium sulfide in copper-molybdenum separation and selection operations by 85%~91%, water glass consumption by 50%, and eliminating diesel and molybdenum operation. The recovery rate has increased to 93%.

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