Test report on mixed ore of Nanzhan County lead-zinc mine

Report Title: mixed ore Nanzheng County of Shaanxi Province to Lead Zinc Mine test optional study reporting format: word
Completion time: 2007 12
Publisher: Guo Changqing Guiding Expert: Gong Meiling Huang Kaiguo Gu Zhongxiang Project Leader: Duan Zhu Report Pages: Foreword 40 pages

Foreword:

Entrusted by a company, Xi'an Tianzhou Mining Technology Development Co., Ltd. carried out a detailed analysis of the mixed ore of the XXX lead-zinc deposit in Nanzheng County, Shaanxi Province from November 19 to December 20, 2007. Optional experimental study. The purpose of the test is to provide preliminary information on the optional evaluation of the deposit and the rational processing techniques.
The deposit is a type of carbonate rock that is caused by marine sedimentation. The main metallic minerals: sphalerite, copper ore, pyrite, limonite, calamine like; gangue minerals are dolomite, calcite, quartz. The ore contains 2.77% zinc, 0.0057% copper, 0.038% lead, 18.97% MgO and 29.45% CaO.
The main recovered mineral is sphalerite, which is self-shaped, semi-self-shaped or his granular crystal. The particle size is generally between 0.05-1 mm and 1.6 mm. The oxidized ore is mainly smithsonite, which is a very fine granular crystal with a particle size of between 0.005 mm and 0.01 mm.
The experiment adopts the flotation method, first flotation of zinc sulfide, and then flotation of zinc oxide, that is, the "first sulfur after oxygen" process. Due to the carbonaceous matter in the ore, the test carried out two closed-circuit process schemes, decarbonization and non-carbon removal. Test results Table 1.
Mixed ore dressing test results Table 1
Process plan
product name
Yield(%)
grade(%)
Recovery rate(%)
Carbon removal
carbon
Zinc sulfide concentrate
Zinc oxide concentrate
0.41
4.20
0.74
4.06
56.15
34.90
0.60
85.56
9.37
No carbon removal
Zinc sulfide concentrate
Zinc oxide concentrate
4.54
0.49
52.66
35.05
87.77
6.30

Conclusion:

1. The mixed ore sample of Nanzheng Zinc Mine is a carbonate type of marine sedimentary genesis. The original rock is dolomitic limestone, and more than 90% of it is silicified dolomitic marble . The main metal minerals are sphalerite, chalcopyrite, pyrite, limonite, and smithsonite. The gangue minerals are mainly dolomite, calcite, quartz and the like.
2. The sphalerite in the ore accounts for about 88% of the total zinc, which is the main object of recycling. The sphalerite is self-shaped, semi-self or granular in its shape, and the particle size of the inlaid cloth is not uniform. The particle size is generally between 0.05 and 1 mm×1.6 mm. Under the condition of coarse grinding, the monomer dissociation is basically achieved, and the floatability is relatively low. Well, under the condition of fully inhibiting the carbonate gangue, the sphalerite can be effectively recovered with a simple agent.
3. The zinc oxide mineral in the ore is mainly zinc ore. The reclaimed zinc ore can be recovered better by the flotation method after vulcanization. However, since the inlaid zinc ore is in the form of very fine granular crystals, the particle size is generally between 0.005 mm and 0.01 mm, and the individual is 0.05-0.1 mm. Under the condition of grinding (-200 mesh 65%), it is difficult to dissociate all units, which is an important reason for the low grade and recovery rate of zinc oxide concentrate.
4. The ore contains a small amount of copper minerals, and the chalcopyrite is melted in the sphalerite by a very fine felt-like body, forming a very fine chalcopyrite melt after decomposition of the zinc and copper sulfide solid solution. It is a small worm-like shape, a felt-like uneven distribution, and therefore copper minerals cannot be recovered.
5. The test adopts the flotation method, the process of flotation of zinc oxide after flotation of zinc oxide, and the closed-circuit test of decarburization and non-carbon removal, which makes the sphalerite effective. Recycling, reclaimed zinc ore is also comprehensively recovered, and the total recovery of zinc reaches 93%-94%.
6. The process plan and technical indicators obtained in this test provide reliable information for the geological evaluation and development of the deposit. Compared with the same type of ore at home and abroad, the selection index is better, the process structure is reasonable, and it is conducive to production practice.

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