At present, wet spraying is the main process for treatment of exhaust gas emitted by concentrated sulfuric acid roasting method decomposition rare earth concentrates, which not only consumes a large amount resources but also wastes residual heat corresponding to temperatures approximately 300 °C. In this paper, an dry processing technology that completely different from original spray proposed ...

ABSTRACT: Roasting is one of the widespread methods for processing of nuts and beans that significantly enhances the flavor, color, texture and appearance of the products. In this research the kinetics and modeling of soybean roasting using combined infrared-hot air system and consumption of energy were investigated. The effect of the hot air temperature (160, 180 and 200 ºC), infrared powers (...

Roasting is one of the basic unit operations in the cocoa base industries.Cocoa beans were roasted using superheated steam oven in superheated steam mode at 150, 200 and 250C for 50 min. The effect of heating time and temperatures with roasting methods on the moisture content, color and texture of the cocoa beans were studied. The changes occurred in the moisture content, colorvalues (L-, a-, b...

roasting has considerable effects on the quality of cream made of nuts. in this study, the roasting conditions of walnut kernels were optimized based on the stability parameters of the produced cream. temperatures of 100-150°c for 10-30 minutes were used to roast walnut kernels. the amount of oil separation, peroxide, acidity and thiobarbituric acid values of the cream, as well as color paramet...

This paper describes the experimental results of removing arsenic from dust collected in electrostatic precipitators a fluidized bed roasting furnace (RP dust). The process generates 600 kilotons copper concentrate per year with 3 - 6 wt% concentration arsenic, producing roasted product low content below 0.3 wt%. 27 RP order 5 and around 20 Subsequently, is treated by hydrometallurgical methods...

In this paper, the composite additive of CaF2/CaO was used to extract vanadium from stone coal, and the effect of roasting and leaching kinetics were studied. The purpose of this manuscript is to realize and improve the vanadium recovery from stone coal using the composite additive. The experimental results indicated that the roasted clinker can be obtained under the conditions of CaF2/CaO at a...

BACKGROUND Coffee processing causes organic dust exposure which may lead to development of respiratory symptoms. Previous studies have mainly focused on workers involved in roasting coffee in importing countries. This study was carried out to determine total dust exposure and respiratory health of workers in Tanzanian primary coffee-processing factories. METHODS A cross sectional study was co...

UNLABELLED Cocoa beans were alkalized before or after roasting and made into cocoa liquor before analyzing by SIFT-MS. In both alkalized-before-roasting and alkalized-after-roasting samples, there were significantly higher concentrations of alkylpyrazines for the samples with pH above 7 than pH below 7. At pH 8, the concentrations of 2,3-, 2,5-, and 2,6-dimethylpyrazine (DMP), 2,3,5-trimethylpy...

In Japan, maximum residue limits for pesticides (MRL) in coffee are set on green coffee beans, but not roasted coffee beans, although roasted beans are actually used to prepare coffee for drinking. Little is known about the behavior of pesticides during the roasting process. In the present study, we examined the changes in the concentration of pesticide (organochlorine: γ-BHC, chlordane and hep...