Guiding experts: Huang Kaiguo, Gong Meiling, Zheng Guangxuan, Hu Jiyou, Gu Zhongxiang; Project leader: Ma Yongji The original test process has been unable to meet the on-site production requirements. In order to enable the on-site production to proceed smoothly to obtain the corresponding indicators, the following additional tests were conducted on the No. 2 ore sample. Aging Oven,Aging Furnace,Aluminum Aging Furnace,Vacuum Heat Treatment Furnace Zhejiang Shangding Industrial Furnace Co., Ltd , https://www.sdindustrialfurnace.com
I. Introduction
Shandong XXXX company in January 2008 sent the first number of lead ore beneficiation test ore, lead grade of 5.66%. The separation process of the primary ore oxidized ore is used to obtain the ideal beneficiation index. The total recovery rate is 91%, and the comprehensive concentrate grade is 51%. The lead concentrate grade in the oxidized ore sorting operation is as high as 63.21%. It is 13.17%. However, the rock ore identification named oxidized ore is lead bismuth, and the theoretical grade of the mineral is 68.3%, and the purity of lead concentrate is as high as 92%. For mechanical beneficiation, it is very difficult to select the purity of oxidized minerals to reach this grade. The single mineral separation of heavy sand in rock ore can be achieved. Thus proving that most of them primary ore galena, while only 9% in the case of loss of gold from the tailings, i.e. all oxide ore is described like mine oxide less than 10%, divided by the norm oxide ore, oxide The rate below 10% can be determined as the primary ore type.
The above analysis fully proves that the No. 1 ore sample is a primary sulfide ore, and at most it can only be designated as a primary lead ore with a relatively low degree of oxidation. Therefore, its selection index is ideal. At the same time, from the supplementary test report in the same period, it is also proved that the mixed flotation process, that is, the simultaneous selection of primary ore and oxidized ore, and the addition of oxidized ore vulcanizing agent 1~2kg/t is also good, which further proves that the vulcanizing agent is This dosage range only acts as an activator and does not inhibit the primary ore. It proves that the multifunctional agent of sodium sulfide has only a general principle of activation in this dosage range. That is to say, the design process of the concentrating plant construction plant is implemented according to the conventional primary sulphide ore dressing process plan, that is, a rough two sweeping two fine process structure is established.
   However, when the ore is actually produced according to the mine, the difference in the nature of the ore is too large, the process structure is unreasonable, the grade of the ore is low, the commissioning is unsuccessful, and the No. 2 beneficiation test sample is used for verification test.
Second, the process flow test
The test adopts the first sulfur post-oxygen process and the sulfur-oxygen mixed flotation process. The test process and conditions are shown in Figure 1, Figure 2. The test results are shown in Table 1.
Table 1 Process flow to explore test results
Process name
product name
Yield(%)
Pb grade (%)
Pb recovery rate (%)
Sulfur-oxygen mixed flotation
Concentrate
1.15
68.90
53.38
Middle mine 4
0.4
12.35
3.38
Middle mine 3
0.8
2.98
1.35
Middle mine 2
1.1
8.04
6.08
Middle mine 1
1.08
2.44
2.03
Tailings
95.47
0.52
33.78
Raw ore
100.0
1.48
100.00
Sulfur post-sulfur flotation
Concentrate 1
2.2
30.32
44.67
Concentrate 2
0.3
50.00
14.67
Middle mine 4
1.55
3.74
4.00
Middle mine 3
0.98
3.36
2.00
Middle mine 2
1.05
1.53
1.33
Middle mine 1
1.3
1.01
0.67
Tailings
92.62
0.53
32.66
Raw ore
100.0
1.50
100.00
It is seen from the test results that the recovery rate of the post-sulfur oxygen flotation process is slightly higher than that of the sulfur and oxygen mixed flotation process, but the concentrate grade is much lower. In addition, considering that the existing equipment process of the plant is not changed as much as possible, the test process selects sulfur and oxygen mixed flotation. However, the above two processes all have the problem of high grade of tailings. The following tests mainly focus on solving the problem of high tailings.
Third, the conclusion
The No. 2 ore sample was sent to our company in September. The nature of the sample from the previous test varied greatly. The grade dropped from the original 5.66% to the current 1.53%. According to the No. 1 ore sample and the on-site debugging tailings grade is 0.5%~ 0.6% can not be reduced, combined with the low level of the No. 2 mine sample, the focus of the verification supplementary test is on reducing the grade of tailings and improving the recovery rate. The experimental research was carried out by increasing the amount of vulcanizing agent , the type of collector , and adjusting the structure of the process. After more than one month of multi-faceted tests, none of them succeeded. The tailings grade was always around 0.4% to 0.5%, and the recovery rate was only 50% to 60%. In this case, the X-ray diffraction analysis and rock ore identification analysis of closed-circuit tailings products were carried out separately (see Attachment 1, Schedule 2). The results of X-ray diffraction analysis show that there are no recyclable minerals in the tailings test. The tailings rock ore identification proves that the galena content of the galena is 0.02-0.04mm, which accounts for 60%. It has become a fine mud grade, which is extremely difficult to select ore type, and the physical beneficiation method is difficult to recycle.
Finally, the mixed flotation, roughing, three sweeping and three finishing processes were adopted to increase the centralized treatment of the middle mine, single throwing small tailings, and to eliminate the slime impact scheme. The concentrate grade was 46.75% and the recovery rate was 64.24%. According to the existing process, the corresponding debugging was carried out. On the basis of the on-site process, the centralized treatment of the mine was added to reduce the impact of the slime, the concentrate grade was 54.93%, and the recovery rate was 60.53%.