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Yahya, Asdarina
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Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Materials Science & Nanotechnology

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Extraction Of Iron (Fe) as A Valuable Metal Content of Nickel Slag Waste Maryudi, Maryudi; Candra, Syahrul Dwi Adi; Azhar , Muh.; Yahya, Asdarina
Indonesian Journal of Chemical Engineering Vol. 1 No. 2 (2023)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v1i2.658

Abstract

Nickel slag is a product that is formed at high temperatures to form metal alloys that are stable enough. It becomes a challenge for researchers to find methods for extracting valuable metal content.  Leaching is one of the solid-liquid extraction methods that can be applied to separate important elements from a solid material.  By using strong acid solvents. Leaching of ferrous metal (Fe) as the main metal in nickel slags was carried out with a 98% 2M sulfuric acid extracting solution.  Destruction of the leachate of nickel slag was then conducted to simplify the complex elements in the samples so that they could be easily analyzed. Destruction of nickel slag leachate samples was carried out using a destructive solution in the form of nitric acid. The maximum yield of iron content was obtained at a size of 140 mesh and 60 minutes with an iron content of 19,141 ppm. The minimum yield of iron content was obtained at 80 mesh-30 minutes of leaching with an iron content of 18,433 ppm. The maximum recovery results were obtained at 140 mesh-60 minutes of leaching. Factors that can influence include solid sample size, extracting solution, mineral form in solids, complexity, pH, operating temperature, and leaching time.
Optimization of Liquid Organic Fertilizer Production from Tofu Liquid Waste Using EM-4 Activator and Additional Ingredients of Rice Washing Water and Goat Urine Maryudi, Maryudi; Kurniawan, Lutfi; Astuti, Erna; Yahya, Asdarina
Indonesian Journal of Chemical Engineering Vol. 2 No. 2 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v2i2.707

Abstract

Liquid organic fertilizer is organic fertilizer in liquid form which is partly or wholly derived from organic compounds such as plant, animal and industrial waste, either in solid or liquid form. The nutrients contained in it are in the form of a very fine solution so that it is easily absorbed by plants, even the leaves or stems. Organic fertilizer is one solution to restore soil minerals physically, chemically and biologically from the bad effects of synthetic fertilizers. The benefits of liquid organic fertilizer include providing nutrients for plants, improving soil structure, suppressing bacteria that can be detrimental to the soil, and continuous use of soil will improve the physical, chemical and biological properties of the soil as a result being conducive to the environment. In the fermentation process, the role of microbes greatly determines the product produced. The aim of this research is to determine the potential of liquid waste. in the form of liquid organic fertilizer with the addition of goat urine and rice washing water with variations of 15 mL and 30 mL to increase micro and micro nutrients with the bacterial activator EM-4 through a fermentation process. The results of the optimum organic fertilizer content show that the Biological Oxygen Requirement is 969,549 ppm, the Chemical Oxygen Requirement is 14,801.04 ppm and the Total Suspended Solids is 5.360 ppm. Optimal macro nutrient results show Nitrogen 0.2527%, phosphorus 0.1359%, potassium 0.15435%. And the highest degree of acidity (pH) is 4.415. on the first day
Co-Authors Azhar , Muh. Candra, Syahrul Dwi Adi Erna Astuti Kurniawan, Lutfi Maryudi Maryudi