The Hanjiz deposit is located in the Republic of Uzbekistan, 50km from the city of Sariasia.
1957 found that the multi-metal deposit. In 1961, a number of scientific research units conducted optional research on the ore, including the Central Asian Nonferrous Metal Research Institute, the Ural Mineral Processing Research and Design Institute, and the Russian Central Institute of Nonferrous Metals and Precious Metals Geological Exploration. The results show that the ore Refractory Ores belongs, require fine grinding (grinding fineness required to achieve 90% -0.074mm) when Ore, but need to use cyanide, and mixtures thereof as a heavy chromate inhibitor. Obtaining a qualified lead concentrate at this time remains a complex task. For example, in the semi-industrial test conducted by the former Quansu Nonferrous Metals Research Institute in 1974, the lead grade in lead was 42.8%, which contained 19.3% Zn. This concentrate can only be used as a feedstock treated with the Кивцт process.
The government of the Republic of Uzbekistan has decided to build a new concentrator near the Hanjiz deposit. In order to develop a design task book, some research is needed to obtain the following raw materials: beneficiation process, pharmaceutical system, beneficiation process indicators and other process parameters.
In order to carry out the necessary research, the geology department of the Almarich Mining and Metallurgical Company collects ore samples, and the collected samples represent the process characteristics (quality and embedding characteristics) of the basic ore type of the deposit. The chemical composition of the ore sample is shown in Table 1.
Table 1 Chemical composition of the ore studied
project | content% | project | content% | project | content% |
Cu | 0.52 | Cd | 0.04 | MgO | 0.8 |
Pb | 3.10 | As | 0.005 | K 2 O | 0.15 |
Zn | 6.7 | SiO 2 | 65.3 | Na 2 O | 0.1 |
Fe | 3.2 | Al 2 O 3 | 4.8 | Au | 0.3 g/t |
S | 7.5 | CaO | 0.3 | Ag | 70g/t |
The ore sample contains 0.85% Cu, 3.29% Pb and 6.6% Zn, and its grade is similar to the ore grade of the C1 grade identified in 1974.
75% of the copper in the sample is primary copper sulfide and 25% is secondary copper sulfide. More than 90% of lead is in the form of lead ore. More than 94% of the zinc is present in the form of sphalerite. Noble metal mainly in fine disseminated sulphide minerals, present in 32% galena, chalcopyrite is present in 30% and pyrite ore.
Studied ore is highly safe change of rock alteration and metasomatism acidic volcanic quartz - chlorite - sericite rocks, containing 52% quartz and 26% layered silicate mineral. The main metal minerals in the sample are sphalerite (10%), galena (3.3%), chalcopyrite (1.4%) and pyrite (6.2%). The metal sulfide mineral particle size fluctuates over a wide range, and the galena and chalcopyrite particle size ranges from 0 to 40 μm to 100 μm, and the particle size is advantageous for beneficiation. However, chalcopyrite and galena are embedded in sphalerite in a turbid form, which is difficult to obtain the lead concentrate of the required quality, and the copper is lost to the zinc concentrate, and the zinc is lost to the copper concentrate.
The ore beneficiation process includes: first copper-lead mixed flotation to obtain copper-lead mixed concentrate, and then copper-lead separation of copper-lead mixed concentrate by cyanide-free method. The sphalerite in the mixed flotation tailings is floated into the zinc concentrate. The test results under different grinding grain sizes show that more than 90% of the copper, lead and zinc minerals are separated into the foam product when the grinding particle size is 75%-0.074 mm. In this grinding particle size, the application of inhibitors (zinc sulfate, sodium dithionite and water glass) and collectors (butyl xanthate and IMA-414-1) and foaming agent (methyl isobutyl methanol) Copper-lead mixed flotation is carried out to obtain copper-lead mixed flotation coarse ore dressing, and after grinding to 95%-0.074mm, it is selected twice, and the copper, lead and zinc grades are 5.5%-6.0%, 35% and 6 respectively. The copper-lead mixed concentrate has a yield of 7%, a copper recovery of 80% to 81%, and a lead recovery of 82% to 84%. The zinc loss rate is 7% to 8%.
Flotation of sphalerite from mixed flotation tailings with butyl xanthate (24-30 g/t) after activation of sphalerite with copper sulfate (200-250 g/t) at pH 10 (CaO dosage: 2 kg/t) After the zinc flotation concentrate is selected twice, the zinc concentrate is obtained, and the zinc grade is 45%, and the recovery rate is higher than 80%.
In order to separate the copper-lead mixed concentrate, a cyanide-free process was applied in the test, and sodium sulfite, sodium thiosulfate, sodium dithionite and sodium dichromate inhibitors were tested.
In order to separate the copper-lead mixed concentrate, the mixed concentrate is treated with sodium sulfide and activated carbon. After the agent has been dissociated from the mineral surface, it is washed with water.
The results of separating copper-lead mixed concentrates using different pharmaceutical systems are shown in Table 2. The exemplified data show that copper concentrates and lead concentrates can be successfully separated under all pharmaceutical systems. Copper recovery of copper concentrate is 69.2%~72.7%, and lead concentrate recovery is 74.7%~78.5%.
Table 2 Separation of copper-lead mixed concentrate results by different methods
No | product name | grade% | Recovery rate% | Separation condition | ||||
Cu | Pb | Zn | Cu | Pb | Zn | |||
1 | Copper concentrate | 20.5 | 9.8 | 6.2 | 69.8 | 5.4 | 1.6 | Activated carbon 2.5kg / t, secondary cleaning, xanthate 2g / t |
Lead concentrate | 0.9 | 43.1 | 7.9 | 9.9 | 74.7 | 6.2 | H 2 SO 4 300 g/t (pH 5.5 to 5.6) | |
Feed mine | 5.7 | 35.0 | 7.5 | 79.7 | 80.1 | 7.8 | Na 2 SiO 3 500 g/t, black medicine 15 g/t | |
2 | Copper concentrate | 26.2 | 10.1 | 2.8 | 66.9 | 4.2 | 0.6 | Na 2 S500 g/t, secondary cleaning, xanthate 2 g/t |
Lead concentrate | 1.3 | 40.6 | 72.0 | 14.7 | 78.5 | 6.5 | H 2 SO 4 400 g/t (pH 5.5-5.6), Na 2 SO 3 | |
Feed mine | 5.7 | 35.1 | 6.4 | 81.6 | 82.7 | 7.1 | 500 g/t, Na 2 SiO 3 500 g/t, black medicine 15 g/t | |
3 | Copper concentrate | 19.7 | 10.0 | 5.7 | 69.2 | 5.9 | 1.5 | Na 2 S500 g/t, secondary cleaning, xanthate 2 g/t |
Lead concentrate | 1.0 | 43.5 | 7.9 | 10.3 | 77.4 | 6.2 | H 2 SO 4 300 g/t (pH 5.5-5.6), Fe 2 SO 4 | |
Feed mine | 5.5 | 35.2 | 7.3 | 79.5 | 83.3 | 7.7 | 300 g/t, Na 2 SiO 3 500 g/t, black medicine 15 g/t | |
4 | Copper concentrate | 17.0 | 10.6 | 3.4 | 72.7 | 7.4 | 1.1 | Na 2 S500 g/t, secondary cleaning, xanthate 2 g/t |
Lead concentrate | 0.9 | 43.2 | 7.9 | 9.2 | 76.4 | 6.3 | H 2 SO 4 300 g/t (pH 5.5-5.6), Na 2 Cr 2 O 4 | |
Feed mine | 5.4 | 34.0 | 6.6 | 81.9 | 83.8 | 7.4 | 400 g/t, Na 2 SiO 3 500 g/t, black medicine 15 g/t | |
It can be seen that the chemical system consisting of IMA-414-1 collector and butyl xanthate, sphalerite and pyrite inhibitor (sodium dithionite) can effectively mix copper and lead concentrates. Concentrates with low zinc content and the best copper to lead ratio are available. This copper-lead mixed concentrate is suitable for the good separation of copper from lead. Sodium sulfite was used as an inhibitor in the final full-flow test. Because sodium sulfite is non-toxic and cheaper than sodium thiosulfate, its price is more cheap than sodium chromate. In addition, in the application of sodium thiosulfate, it is also necessary to add ferrous sulfate at the same time, and it is necessary to add sodium dithionite when applying sodium dichromate.
On the basis of the optimal dosage of the agent, a closed circuit test was carried out. The test procedure is shown in Figure 1. The test results (Table 3) show that in the copper-lead mixed flotation circuit, the selective collector IMA-414-1 is mixed with butyl xanthate, and the inhibitor sodium dithionite is added to separate the flotation in copper and lead. In the acidic medium created by sulfuric acid, the application of sodium sulfite as an inhibitor can ensure the qualified concentrate, the zinc and lead impurities in the copper concentrate and the impurities in the lead concentrate, copper and lead content meet the concentrate metallurgical treatment. Technical standards requirements. High quality zinc concentrate is obtained from the mixed flotation tailings, and the recovery of zinc is greater than 80%.
Table 3 Hanjizi polymetallic ore dressing results
product name | Yield% | grade | Recovery rate% | ||||
Cu | Pb | Zn | Cu | Pb | Zn | ||
Copper concentrate | 2.0 | 17.8 | 6.9 | 5.3 | 69.9 | 4.5 | 1.6 |
Lead concentrate | 5.3 | 0.7 | 45.3 | 8.4 | 7.4 | 77.4 | 6.9 |
Zinc concentrate | 9.15 | 0.6 | 1.1 | 60.4 | 11.1 | 3.2 | 85.1 |
Tailings | 83.55 | 0.07 | 0.55 | 0.5 | 11.6 | 14.9 | 6.4 |
Raw ore | 100.0 | 0.51 | 3.1 | 6.5 | 100.0 | 100.0 | 100.0 |
Figure 1 Final closed circuit test procedure
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