Conference Agenda

The purpose of this research work was to measure the noise level in the workplaces of the crushing area, with the purpose of proposing control measures to reduce noise in a non-metallic mining company, taking into consideration the hierarchy of controls. To this end, environmental monitoring of the noise generated by the different teams of the Organization was carried out; identifying that the crusher is the one that exceeds the maximum permissible limit; Therefore, the occupational noise to which the crusher operator and his assistant are exposed during their 8-hour workday was evaluated; for 6 days. The results were compared with what is established in D.S 024-2016-EM, for an 8-hour day, which has an Exposure Limit Value (LEV) of 85 dB. Obtaining that the minimum value for the crushing operator was 88.6 dB and for the assistant it was 92.23 dB; On the other hand, for the two jobs the maximum value was obtained 95.98 dB, exceeding the VLE in both cases.

Finally, he proposed as control measures: the implementation of a vibrator for the feeding hopper; the design of a soundproof cabin, with rock wool as an insulating material; a noise control plan and personal protective equipment considering ear muffs.

A physicochemical characterization of the Huaynaputina volcanic lapilli was carried out using X-ray diffraction (XRD), X-ray fluorescence (XRF), Differential scanning calorimetry (DSC) and Thermogravimetric analysis (TA) techniques in order to evaluate its potential as a pozzolanic material. The results obtained demonstrated that the material complies with the requirements established in the ASTM C-618 standard. Compressive strength tests were performed on mortars with different lapilli dosages and grinding degrees. The results indicated that grinding significantly improves pozzolanic reactivity, allowing partial replacement of cement without compromising mechanical properties. These findings open new possibilities for the development of more sustainable cemented materials with lower environmental impact.

Aluminum is the third most abundant metal on earth and is currently widely used in industrial, technological and medical sectors, including pharmaceuticals and personal care products. However, in recent years, several studies suggest possible health risks of aluminum, being associated with neurotoxicity, Alzheimer's disease and breast cancer. Therefore, the aim of this study was to propose, develop and validate a simple, reliable and accessible UV-VIS spectrophotometric method for the quantification of aluminum by means of the aluminum-alizarin complex. The method proved to be linear with a coefficient of determination R² of 0.9998, precise with a relative standard deviation (RSD) of less than 11% and accurate with recovery percentages higher than 80% and lower than 110%, as stipulated by the AOAC. In conclusion, the method proved to be simple, accessible, reliable, precise and accurate for the quantification of aluminum in antiperspirant samples.

In this research, starch was extracted from avocado seeds (Persea Americana Mill) and cellulose from pineapple crowns (Ananas comosus) to produce biofilms. The research focused on studying the effect of the percentage of microcellulose and plasticizer on the tensile strength, deformation and rigidity of biofilms based on modified starch reinforced with cellulose microfibers (45, 50 and 55%;). Starch and cellulose were extracted by wet extraction and treatments (alkaline and acid), respectively. The shaping method used for the biofilms was solution fusion and glycerin was used as a plasticizer at doses of 20, 25 and 30%. The results showed maximum tensile strength and stiffness values of 12.1 MPa and 54.1 MPa respectively; in films reinforced with 55% cellulose and plasticized with 20% glycerin, although the maximum percentage deformation (42.6%) was reached in biofilms with 50% cellulose and 25% glycerin. Meanwhile, the lowest tensile strength values (7.2 MPa) were achieved with 45% cellulose and 30% glycerin, while the lowest stiffness (18.6 MPa) was achieved with 50% cellulose and 25 % glycerin, and the minimum deformation was 22% with 45% cellulose and 20% glycerin. It was concluded that as the weight percentage of cellulose increases up to 55% in the biofilms, the average values of tensile strength and stiffness increase, On the contrary, as the weight percentage of glycerin increases up to 25%, the tensile strength and rigidity decrease; Regarding the percentage deformation of the biofilms, they presented an inverse effect. This study aimed to expand research on biofilms used as biodegradable packaging.

The objective of this research was to determine the influence of the percentage of hydroxyapatite (HA) on impact strength, adhesive wear and shore hardness in biocomposites based on high-density polyethylene (HDPE). HA was obtained from eggshells after grinding, phosphating and calcination processes. The HDPE-HA biocomposites were manufactured by single-screw extrusion process, L/D: 20 to 0%, 10%, 20%, 30% and 40% weight of HA in a temperature range of 230-240°C. Characterization by Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray diffraction confirmed the formation of HA. The best results of the mechanical properties studied were presented in biocomposites with 20% HA, achieving an impact strength of 23.10 KJ/m2, an adhesive wear in terms of mass loss of 0.367g and a hardness of 19.77 Shore D. The research concludes that the addition of HA improves the properties of impact strength, adhesive wear and shore hardness in biocomposites with HDPE matrix, with 20% HA being the optimal addition percentage.

Characterization of biodegradable polymers made from polylactic acid derived from tuber starches such as cassava and otoe, reinforced with yerba mate nanoparticles.

Abstract– The development of materials based on natural resources has gained significant attention in recent decades due to their potential to provide sustainable alternatives for reducing environmental pollution. Currently, biodegradable polymers derived from natural starches are used in the production of single-use products. This research focuses on the characterization of biodegradable polymers made from polylactic acid derived from the starch of Panamanian tubers, such as cassava and otoe, reinforced with yerba mate nanoparticles. Various tests, including water vapor permeability, thermogravimetric analysis, tensile testing, and biodegradation assessment, were conducted. To achieve this, bioplastic sheets were fabricated using the solvent-casting technique. The starch-based polymer matrix was plasticized with glycerol at 25% (AL1) and 35% (AL2) w/w, and the glycerol-plasticized composition with 25% glycerol was reinforced with 1% (AL3) w/w yerba mate nanoparticles. The results, when evaluated and analyzed, demonstrate the functionality of the studied compositions, as they exhibit notable strength and biodegradability, offering a viable solution to produce products made from natural sources.