New process for removing impurities from zircon concentrate

First, the depth study impurity removal technology preface zircon is "eight five" national key scientific and technological projects - Research zircon powder technology (No. 85-104-20-03-01) sub-topics. It is required that the zircon impurity content after impurity removal is TiO2 ≤ 0.1%, and Fe2O3 ≤ 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 content of zircon TiO2 and Fe2O3 reached the target of attack and the color was white.

2. The sample is the main ore sample of the test using the zircon concentrate in the pre-paste mining 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: TiO2%=0.43, Fe2O3%=0.203, (Zr·Hf)O2%=64.84; Wanning Mine: TiO2%=0.14; Fe2O3%=0.086, ( Zr·Hf)O2%=65.13. From the past analysis of the pre-powment zircon concentrate sample, the distribution of impurity content of TiO2 and Fe2O3 is relatively uniform. It is impossible to enrich TiO2 and Fe2O3 by sieving and classification, so it is not sieved and classified before treatment. 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) Pharmacy selection test After a large number of exploratory experiments with a variety of agents, take Qiongye 1#, Qiongye 2#, Qiongye 3#, Qiongye 4# and Qiongye 5# reagents at 100kg/t The dosage was treated for 50 minutes before the paving mine and Wanning Mine. The results are as follows: It can be seen from Table 1 that the sample is treated with Qiongye 3# with the lowest impurity content and the best whiteness. Therefore, choose Qiongye 3# reagent for further test. . 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) Treatment time test The l00kg/t Qiongye 3# was used to test the time before the paving. The results are 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.

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

It can be seen from the results in Table 3 that the amount of the agent is increased and the impurity content is lowered. When the dosage of the agent is 80 kg/t, the impurity content and the whiteness both meet the test requirements, and the white purified zircon yield is ≥98%. Under the premise of ensuring the quality and reducing the cost, taking into account the change of the impurity content of the mineral sample in the production, the dosage of the agent should be 80~100kg/t.

(4) Expanding the test with 80kg/t Qiongye 3# for several parts (per lt) of paving the ore for 30 minutes, the whiteness (visual) is about 57 degrees, the yield is 98.1%, the comprehensive sample (718- Comprehensive) containing 0.09% TiO2, 0.05l% Fe2O3, 65.14% (Zr·Hf)O2. It can be seen that the impurity content and whiteness both meet the test requirements.

Fourth, the recommended process conditions and process conditions: the dosage of the agent 80 ~ l00kg / t, the removal time 30 ~ 40min. scrub the fixed mouth ratio of 1: 2. The process is shown in Figure 1.

Figure 1 New process flow

V. Conclusion

(1) Using the process technology to treat pre-pate zircon concentrate, the yield is ≥98%, the impurity content of TiO2 and Fe2O3 is reduced to 0.1% and 0.06%, respectively, and the whiteness is higher, which can be zircon emblem. 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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