I. Introduction
Zircon deep decontamination technology research is a sub-topic of the national “Eighth Five-Year Plan†key scientific and technological research project - zircon micro-powder technology research (No. 85-104-20-03-01). The zircon impurity content after impurity removal is required to be TiO 2 ≤ 0.1%, and Fe 2 O 3 ≤ 0.06%. The aim is to provide high quality and reliable raw materials for the production of zircon powder. Guangzhou made a more detailed study of non-ferrous metals Research Institute in June 1993 to complete the "depth of zircon Removing Technology Research Report" on its titanium and iron impurities Occurrence of disseminated form, and impurity removal processes. In order to find a more effective means of removing impurities from industrial production, this experiment explores several reagents and explores a new process for drug removal. The treated zircon TiO 2 and Fe 2 O 3 contents all achieved the target and the color was white.
Second, the sample
The main ore sample of the test was taken as the zircon concentrate in the paving area. The Wanning Mine sample is a verification sample. The color is flesh gray, and the chemical composition analysis results are as follows: pre-plating ore: TiO 2 %=0.43, Fe 2 O 3 %=0.203, (Zr·Hf)O 2 %=64.84; Wanning Mine: TiO 2 %=0.14; Fe 2 O 3 % = 0.086, (Zr·Hf)O 2 % = 65.13.
From the past results of the pre-paste zircon concentrate sample, the distribution of TiO 2 and Fe 2 O 3 impurities is relatively uniform, and it is impossible to enrich TiO 2 and Fe 2 O 3 by sieving and classification. No screening classification is performed before.
According to the zircon depth removal technology report, there are three forms of iron and titanium in zircon concentrate:
(1) The surface of the zircon particles and the iron film in the fracture;
(2) inclusions of iron and titanium minerals in zircon particles;
(3) A small amount of titanium minerals contained in the zircon concentrate.
This provides the possibility of treatment with a drug to reduce iron and titanium impurities in the zircon concentrate.
Third, drug treatment test
(1) Drug selection test
After a large number of exploratory experiments with a variety of pharmacies, take Qiongye 1#, Qiongye 2#, Qiongye 3#, Qiongye 4# and Qiongye 5# reagents, respectively, with a dosage of 100kg/t. Treated with Wanning Mine for 50 minutes, the results are as follows:
It can be seen from Table 1 that the sample is treated with Qiongye 3#, the impurity content is the lowest, and the whiteness is the best. Therefore, Qiongye 3# reagent is selected for further testing.
Table 1
Sample | Sample serial number | Pharmacy | chemical composition(%) | Whiteness (visual) | ||
TiO 2 | Fe 2 O 3 | (Zr·Hf)O 2 | ||||
Pre-mine | 329-1# | Qiongye 1# | 0.24 | 0.075 | 65.12 | second |
329-2# | Qiongye 2# | 0.31 | 0.094 | 64.97 | third | |
329-3# | Qiongye 3# | 0.09 | 0.044 | 65.29 | the first | |
329-4# | Qiongye 4# | 0.33 | 0.094 | 64.87 | fifth | |
329-5# | Qiongye 5# | 0.41 | 0.087 | 65.00 | fourth | |
Wanning Mine | 410-1# | Qiongye 1# | 0.10 | 0.069 | 65.36 | second |
410-3# | Qiongye 3# | 0.08 | 0.051 | 65.36 | the first | |
(2) Processing time test
The treatment time test of the pre-paste mine with l00kg/t Qiongye 3# is shown in Table 2:
Table 2
Processing time (minutes) | Sample serial number | Yield(%) | chemical composition(%) | -200 mesh whiteness (mesh) | ||
TiO 2 | Fe 2 O 3 | (Zr·Hf)O2 | ||||
20 | 502-1# | 98.4 | 0.13 | 0.066 | 65.18 | 52.7 |
30 | 502-2# | 98.0 | 0.08 | 0.047 | 56.8 | |
40 | 502-3# | 98.0 | 0.08 | 0.044 | 58.9 | |
50 | 502-4# | 98.2 | 0.09 | 0.044 | 58.7 | |
From the results of Table 2, it can be seen that with the prolongation of treatment time, the impurity content gradually decreases, the whiteness gradually increases, and the white purified zircon yield is ≥98%. When the treatment time reaches 30 minutes, the impurity content and whiteness reach the test. Claim. Under the premise of ensuring the quality increase of production, taking into account the change of the impurity content of the mineral sample in the production, the treatment time is 30-40 minutes.
(3) Pharmacological dosage test
Use Qiongye 3# to treat the pre-paste sample for 30 minutes as the dosage test. The results are shown in Table 3:
table 3
Dosage amount (kg/t) | Sample serial number | Yield(%) | chemical composition | Whiteness (visual) | ||
TiO 2 | Fe 2 O 3 | (Zr·Hf)O 2 | ||||
40 | 523-1# | 98.6 | 0.16 | 0.056 | 65.10 | ≈53 degrees |
60 | 523-2# | 98.3 | 0.12 | 0.052 | ≈57 degrees | |
80 | 523-3# | 98.0 | 0.09 | 0.049 | ≈57 degrees | |
100 | 523-4# | 98.0 | 0.08 | 0.047 | ≈57 degrees | |
(4) Expanding the test
Using 80kg/t Qiongye 3# to treat several parts (per lt) of paving ore for 30 minutes, the whiteness (visual) is about 57 degrees, the yield is 98.1%, and the comprehensive sample (718-series) contains 0.09%. TiO 2 , 0.05 l% Fe 2 O 3 , 65.14% (Zr·Hf)O 2 . It can be seen that the impurity content and whiteness both meet the test requirements.
Fourth, recommended process conditions and processes
Process conditions: dosage of 80 ~ l00kg / t, decontamination time 30 ~ 40min. Scrubbing the solid mouth ratio 1:2.
The process is shown in Figure 1.
Figure 1 New process flow
V. Conclusion
(1) Using the process technology to treat the pre-pate zircon concentrate, the yield is ≥98%, the impurity content of TiO 2 and Fe 2 O 3 is reduced to 0.1% and 0.06%, respectively, and the whiteness is higher, which can be Zircon powder production provides high quality and reliable raw materials.
(2) The process technology has a wide range of sources, simple process, convenient operation and easy conversion into productivity.
(3) It can be seen from the test data that the process technology has good iron-reducing effect, so the precision of the process technology is more remarkable for the treatment of zircon with higher iron content.
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