Abstract
Salicylic hydroxamic acid is a novel flotation reagent used in mineral processing. However, it impacts the flotation wastewater leaving behind high chromaticity which limits its reuse and affects discharge for mining enterprises. This study researched ozonation catalyzed by the granular activated carbon (GAC) method to treat the chromaticity of the simulated mineral processing wastewater with salicylic hydroxamic acid. The effects of pH value, ozone (O3) concentration, GAC dosage, and reaction time on chromaticity and chemical oxygen demand (CODCr) removal were discussed. The results of individual ozonation experiments showed that the chromaticity removal ratio reached 79% and the effluent chromaticity exceeded the requirement of reuse and discharge when the optimal experimental conditions were pH value 3, ozone concentration 6 mg/L, and reaction time 40 min. The orthogonal experimental results of catalytic ozonation with GAC on chromaticity removal explained that the chromaticity removal ratio could reach 96.36% and the chromaticity of effluent was only 20 when the optimal level of experimental parameters was pH value 2.87, O3 concentration 6 mg/L, GAC dosage 0.06 g/L, reaction time 60 min respectively. The degradation pathway of salicylic hydroxamic acid by ozonation was also considered based on an analysis with ultraviolet absorption spectrum and high-performance liquid chromatography (HPLC).
Highlights
Tungsten ore is one of the dominant mineral resources in China, its production, consumption, and foreign trade exports rank first in the world
Salicylic hydroxamic acid is a kind of chelating collector with high selectivity to metal oxide ore, it has been applied in the mineral processing of tungsten molybdenum ore, rare earth ore, nonferrous metal ore, and other oxide ores, and it is becoming a research hotspot of new oxide ore collectors [3,4]
In order to explore the effect of granular activated carbon (GAC) adsorption on color removal, the experiments were carried out at various dosages, ranging from 0.03 g/L to 0.18 g/L, initial chromaticity was at a constant value of 600
Summary
Tungsten ore is one of the dominant mineral resources in China, its production, consumption, and foreign trade exports rank first in the world. Mineral processing wastewater is the most important source of wastewater in China, which accounts for about one-tenth of industrial wastewater. In the application of tungsten mineral processing reagents, anionic collectors, amphoteric collectors, cationic collectors, and non-polar collectors are the four most commonly used tungsten collectors [1,2]. Salicylic hydroxamic acid is a kind of chelating collector with high selectivity to metal oxide ore, it has been applied in the mineral processing of tungsten molybdenum ore, rare earth ore, nonferrous metal ore, and other oxide ores, and it is becoming a research hotspot of new oxide ore collectors [3,4]
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