Configuration of flowsheet and reagent dosage for gilsonite flotation towards the ultra-low-ash concentrate

Gilsonite has a wide variety of applications in the industry, including the manufacture of electrodes, paints and resins, as well as the production of asphalt and roof-waterproofing material. Gilsonite ash is a determining parameter for its application in some industries (e.g., gilsonite with ash content < 5% used as an additive in drilling fluids, resins). Due to the shortage of high grade (low ash) gilsonite reserves, the aim of this study is to develop a processing flowsheet for the production of ultra-low-ash gilsonite (< 5%), based on process mineralogy studies and processing tests. For this purpose, mineralogical studies and flotation tests have been performed on a sample of gilsonite with an average ash content of 15%. According to mineralogical studies, carbonates and clay minerals are the main associated impurities (more than 90 vol.%). Furthermore, sulfur was observed in two forms of mineral (pyrite and marcasite) and organic in the structure of gilsonite. Most of these impurities are interlocked with gilsonite in size fractions smaller than 105 µm. The size fraction of + 105 − 420 µm has a higher pure gilsonite (approximately 90%) than other size fractions. By specifying the gangue minerals with gilsonite and the manner and extent of their interlocking with gilsonite, + 75 − 420 µm size fraction selected to perform flotation tests. Flotation tests were performed using different reagents including collector (Gas oil, Kerosene and Pine oil), frother (MIBC) and depressant (sodium silicate, tannic acid, sulfuric acid and sodium cyanide) in different dosages. Based on the results, the use of kerosene collector, MIBC frother and a mixture of sodium silicate, tannic acid, sulfuric acid and sodium cyanide depressant had the most favorable results in gilsonite flotation in the rougher stage. Cleaner and recleaner flotation stages for the rougher flotation concentrate resulted in a product with an ash content of 4.89%. Due to the interlocking of gilsonite with impurities in size fractions − 105 µm, it is better to re-grinding the concentrate of the rougher stage beforehand flotation in the cleaner and recleaner stages. Finally, based on the results of mineralogical studies and processing tests, a processing flowsheet including crushing and initial granulation of gilsonite, flotation in rougher, cleaner and recleaner stages has been proposed to produce gilsonite concentrate with < 5% ash content.
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Pinellas County, FLfox13news.com

High concentrations of red is not turning away beachgoers

MADEIRA BEACH, Fla. - The Florida Fish and Wildlife Conservation Commission detected high levels of karenia brevis (red tide) from Indian Shores to Pass-A-Grille, and low to medium levels in other Pinellas County beaches. The county sent out a reminder on Friday about the ongoing health alert for respiratory irritation...
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Chicago, ILneiu.edu

Northeastern expands master’s concentrations, adds graduate certificate

Northeastern Illinois University’s Master of Public Health (MPH) program will now offer two concentrations—Public Health Promotion and School Health—beginning Fall 2021. The Department of Health Science and Physical Education will also offer a School Health Graduate Certificate, which can be fully completed online. This is in addition to the Public Health Graduate Certificate the department has previously offered.
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MBA concentrations: Types and how to choose

While an MBA degree overall helps students enter a career in business, MBA concentrations allow students to specialize, preparing them to take leadership roles and more demanding projects. When you enter your program, you may be able to choose an MBA concentration that interests you — like management, finance or information technology.
Diseases & Treatmentsasnjournals.org

High Oxalate Concentrations Correlate with Increased Risk for Sudden Cardiac Death in Dialysis Patients

Background The clinical significance of accumulating toxic terminal metabolites such as oxalate in kidney failure patients is not well understood. Methods To evaluate serum oxalate concentrations and risk of all-cause mortality and cardiovascular events in a cohort of kidney failure patients requiring chronic dialysis, we performed a post-hoc analysis of the randomized German Diabetes Dialysis Study (4D Study); this study included 1255 European hemodialysis patients with diabetes followed up for a median of 4 years. The results obtained via Cox proportional hazards models were confirmed by competing risk regression and restricted cubic spline modeling in the 4D cohort and validated in a separate cohort of 104 US dialysis patients after a median follow-up of 2.5 years.

Medication maths: how to solve pharmacy calculations: concentrations, dilutions and health economics (video)

At the end of this article, individuals should be able to:. Systematically work through concentration/dilution and health economics calculations to reach the correct answer;. Ensure prescriptions requiring dilution of product are correct;. Support medicines-related cost analysis activities;. Understand the importance of units and rounding when solving calculations. This article forms...