Study of enrichment of vermiculite ores of the «Tebinbulak» deposit of the Republic of Uzbekistan Avaz Aripov, Fozil Akhtamov, Quvonchbek Bektamishov, Aslonbek Ikromov, Farxod Erkinov

Figure 2. Vermiculite derivatogram: 1-Temperature curve; 2- dynamic thermogravimetric analysis curve (DTGA); 3- dynamic thermogravimetric analysis curve derivative (DTGP); 4-DSK curve
Analyzes show that, intensive decay occurs in the 2-degradable interval. In this interval, the amount of decay, i.e. 5.3% of the decay takes place. A detailed analysis of dynamic thermogravimetric analysis curve and DSK curve is presented in table 3.
Table 3. Analysis of vermiculite DTGA and DSK curve results

№	Tempereture, ^оС	Lost mass, %	The rate of decomposition of the substance, mg/min	The amount of energy consumed (µВ*s/mg))
1	50	0.125	0.137	1.45
2	100	0.985	0.465	2.88
3	200	1.025	0.453	2.01
4	300	1.235	0.087	3.02
5	400	1.985	0.147	1.02
6	500	2.569	0.455	2.03
7	600	3.215	2.499	1.59
8	700	4.021	2.125	1.69
9	800	5.012	1.265	1.89
10	900	6.258	2.698	3.02
11	1000	7.541	1.235	2.05
12	1100	8.014	0.235	3.02
13	1200	8.126	0.356	1.25

From these derivatograph studies, it appears that the main mass loss occurs in the range 150-1180⁰C, where 8.2% of the main mass, i.e., 5.6 mg of mass, is lost. After 1180⁰C, no change is observed, the mass remains unchanged. Thermogravimetric, DSK, DTG analysis of vermiculite is presented in Figures 3 and 4.

Figure 3. Thermogravimetric curve of vermiculite

Figure 4. DSC analysis of vermiculite
5. Major findings
On the basis of theoretical and experimental studies carried out in the scientific work, the following results were obtained:
(1) The composition and properties of vermiculite ore have been fully studied and it contains SiO₂-38.1%, MgO-23.4%, Al₂O₃-12.2%, Fe₂O₃-9.5%, FeO-1.2%, K₂O-5.1%, TiO₂-1.5%, H₂O-5.2%.
(2) Vermiculite ore is granular, of various shapes, with relatively large pieces up to 20 mm, since the swelling process is associated with the size of vermiculite, it was determined that before enrichment, vermiculite ore must be crushed to a size of -4 mm.
(3) Due to the high content of titanomagnetite in the ore, a magnetic concentrate was obtained by magnetic separation at the beginning of the technological process by magnetic separation. The content of Fe₃O₄ in the magnetic concentrate from 24.7% to 50% makes it possible to use it in the cement industry as an iron additive.
(4) As a result of the tests, an effective technological scheme of dry beneficiation of vermiculite ores was developed. The yield of vermiculite enrichment by fractions is 3.5-4%. As a result of the studies carried out according to the developed scheme of vermiculite enrichment, the output of vermiculite enrichment for fractions -4+2mm, -2+1mm and -1mm was 11.47%, the amount of vermiculite in enrichment was 85%, and the degree of separation of vermiculite in enrichment was 95.95% organized. From the results of the conducted experiments, it was found that the dry beneficiation of vermiculite ores according to the proposed scheme is effective enough.

References

1. 
   Aripov A.R. Obogashenie vermikulitovix rud Karauzyakskogo mestorojdeniya respubliki Karakalpakistan // Universum: texnicheskiye nauki. – 2021. –. g. Moskva №. 3-13(84). – s. 78-81.
   
2. 
   Aripov A.R., Fuzaylov O.U., Toshev O.E. Vermikulitovaya ruda Karauzyakskogo mestorojdeniya respubliki Karakalpakistan // Journal of Advances in Engineering Technology Vol.1(3), January - March, 2021. 31-34c.
   
3. 
   Aripov A.R., Saidakhmedov A.A., Vokhidov B.R. Development of a technology for enrichment of vermiculite ore of the Karauzyak deposit. // Universum: texnicheskiye nauki. - № 12 (93). 2021. – 5-10 s.
   
4. 
   Xasanov A.S., Rajabboyev I.M., Vokhidov B.R., Aripov A.R.// Izuchenie veshestvennogo sostava i razrabotka texnologii pererabotki rud mestorojdeniya Tebinbulak // Gorniy vestnik Uzbekistana №2 (77) 2019. 57-61 s.
   
5. 
   Aripov A.R., Akhtamov F.E. Saidakhmedov A.A., Vokhidov B.R. Razrabotka texnologii obogasheniya vermikulitovix rud Karauzyakskogo mestorojdeniya // Gorniy journal Kazaxtana. №2.2022. 33-39s.