Research report on the selectivity of a copper oxide in Xinjiang

Guiding experts: Huang Kaiguo, Gong Meiling, Zheng Guangxuan, Hu Jiyou, Gu Zhongxiang; Project leader: Ma Yongji

I. Introduction
XXXX commissioned by Xinjiang, Xian Zhou Mining Technology Development Co., Ltd. in June 2008 to August of Xinjiang somewhere copper oxide ore detailed experimental studies were optional. Its purpose is to provide a set of economical and technically feasible process for the mine to provide a scientific basis for mine development and utilization.
The testers first conducted detailed process mineralogical studies and chemical multi-element analysis, X-ray diffraction analysis, and copper phase analysis on the test samples. The types and occurrence characteristics of ore minerals, as well as the structural characteristics of the ore were identified, the structural characteristics of the gangue minerals were ascertained, the rock types of the deposits and the corresponding rock names were identified, and the process mineralogy and copper phase analysis were The mine is a copper oxide mine. Due to the complexity of the ore structure and mineral composition, it is a low grade, difficult to choose difficult to dissociate copper oxide ore.
The copper oxide, the mineral composition is more complex, ore minerals are: bornite, covellite, malachite, azurite, pyrite, hematite and limonite. The structure of the ore is relatively complicated, and the colloidal structure can be seen in the ore mineral, the cryptocrystalline structure and the fine-grained crystal structure and its granular structure.

The primary minerals in ore minerals are porphyrite and pyrite, and the secondary minerals are hematite, limonite, malachite, azurite and copper blue. Most of them are formed by secondary oxidation.

   

Xinjiang copper oxide ore grade of 2.15% copper, silver ore grade of 216g / t. According to the nature of the ore, the test uses two coarse, three sweep, three fine flotation process, closed circuit test indicators: copper concentrate grade 21.32%, copper concentrate silver 2282.82g / t, copper recovery rate 74.74%, silver The recovery rate is 90.03%.

Second, the beneficiation test
Process discussion The selection methods of copper ore generally have the following methods: 1. Flotation by flotation; 2. Flotation by fatty acid method; 3. Flotation by sulfur-oxygen mixed method; 4. Flotation by oxygen followed by oxygen. In view of the high degree of oxidation of the sample ore (oxidation phase accounts for 86.67% and vulcanized phase accounts for 12.86%), according to previous mineral processing experience, the single vulcanization flotation and fatty acid flotation effect will not be too good, so The latter two selection schemes were compared.
The comparison test of the sulfur-oxygen mixed-selection and the first sulfur-post-oxygen process has a fixed grinding fineness of -200 mesh 70%. The test conditions and process flow are shown in Figure 1, Figure 2. The test results are shown in Table 1.

Table 1 Process Discussion Test Results
Selection method
product name
Yield(%)
grade
Recovery rate(%)
Cu (%)
Ag(g/t)
Cu
Ag
Sulfur-oxygen mixing
Copper concentrate
6.0
14.41
2039.0
43.3
72.16
Medium mine
5.7
9.64
458.0
27.52
15.4
Tailings
88.3
0.66
23.9
29.18
12.44
Raw ore
100.0
2.00
169.55
100.0
100.0
Sulfur post-oxygen method
Copper concentrate 1
6.8
6.21
1247.0
20.56
53.42
Copper concentrate 2
9.2
11.07
549.0
49.58
31.82
Tailings
84.0
0.73
27.9
29.86
14.76
Raw ore
100.0
2.05
158.74
100.0
100.0

   

The test results in Table 1 indicate that the flotation of copper and silver by sulfur-oxygen mixing method is better than that of the first sulfur and oxygen flotation. Therefore, the scheme of flotation process using sulfur-oxygen mixed method is proposed.

Third, the conclusion

(I) Research on Process Mineralogy Summary The Xinjiang copper oxide ore and mineral composition are relatively complex. The useful minerals are porphyrite, copper blue, malachite and azurite. Other ore minerals are limonite, pyrite, and hematite. Identify the gangue minerals are feldspar, quartz, illite, barite, tuff, and the like glassy, mineral structure complicated structure, wherein the mineral ore colloidal structures can be seen, the fine cryptocrystalline structure and crystalline The structure and its granular shape, the primary minerals in the ore minerals are porphyrite and pyrite, the secondary minerals are hematite, limonite, malachite, azurite and copper blue, most of which are secondary oxidation Formed, the mine is a low-grade ore type that is difficult to dissociate.

(II) Test results According to the nature of the ore, the open circuit test uses three process flows for comparison. By comparison, the closed circuit test uses two rough selections, three sweeps, three selections, the first section of the selected mines and the first A sweeping mine merged, and two fine sweeps and a small tailings were drilled to prevent the subsequent impact of the slime. The closed-circuit test indication was: copper concentrate grade 21.32%, copper concentrate containing silver 2828.82g/t, copper The recovery rate is 74.74%, and the silver recovery rate is 90.03%.

(III) Problems with tailings settlement Because the ore is oxidized ore, contains many mud, and there is a certain amount of tuff, the tailings can not be settled naturally. In the future, lime flocculation can be used to settle the ground. The lime dosage is 0.2%~ 0.5%, lime is added to the tailings end of the tailings.

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