Tg 209 f1 libra

A TG analyzer (model: TG 209 F1 Libra) produced by NETZSCH GmbH (Selb, Germany) and FITR (model: iS50) of Thermo Fisher Scientific (Waltham, MA, USA) were used to perform thermal analysis and measure the TG characteristics and infrared (IR) curve of the samples. The test parameters were as follows: 20 mg of a sample in a nitrogen atmosphere was heated from 35 °C to 1100 °C, with heating rates of 10, 20, 30, and 40 °C min⁻¹; the sampling parameter resolution of the Fourier Transform Infrared Spectrometer was 4 cm⁻¹; and the wavenumber range was 4000–400 cm⁻¹. An X-ray diffractometer (model: Panaco Empyrean) was used to analyze the phase composition of calcined phosphorite. The test conditions were: voltage of 40 kV, current of 40 mA, continuous scanning, scanning range of 10–80°, and scanning speed of 2° min⁻¹. The chemical composition of the calcined phosphate tailings was analyzed using an X-ray fluorescence (XRF) analyzer. A TG analyzer and MS (PE TGA8000-FRONTIER-SQ8) were used to detect the distribution of volatile matter and gases with reaction temperature from the pyrolysis. The detection conditions were: He gas 99.999% atmosphere and a carrier gas flow rate of 20 mL min⁻¹.

A TG 209 F1 Libra from Netzsch was coupled via transfer line with a Fourier Transform Infrared Spectrometer (FTIR) Vertrex 80v from BRUKER. The measurement was carried out in an argon atmosphere with a gas flow of 75 mL⋅min⁻¹ in a temperature range from 40 °C to 300 °C at a heating rate of 1 K⋅min⁻¹. Platinum crucibles without lids were used and a sample quantity of 26±2 mg for [C₄C₁im]BF₄ and 6±1 mg for SeO₂ was weighed in. The head temperature of the TGA was 200 °C and the transfer line was tempered to 230 °C to prevent condensation of the gaseous species formed. The gas cell of the FTIR was heated to 200 °C. Spectra were recorded in a range from 4000 cm⁻¹ to 600 cm⁻¹. The resolution was 2 cm⁻¹ and 32 scans were taken for each spectrum. The evaluation was performed using Proteus and OPUS 8.1 software.