Papers by Author: Yao Ding

Abstract: Novel technology for producing iron oxide red from bypoduct ferrophosphorus was proposed. The conversion rate of Fe can reach 91% when the acidolysis temperature is 408 K,acidolysis time is 90 min, the dosage of H2SO4 is 1.2 times the theoreti-cal value, the ratio of the mass of water for calcined product is 0.9 and the ratio of the mass of catalyst for calcined product is 0.02. The comprehensive recovery and utilization of ferrophos-phorus is feasible with this process.

Abstract: The solubility of 8-hydroxyquinoline lead, lead diethyldithiocarbamate, 8-hydroxyquinoline mercury and mercury diethyldithiocarbamate in supercritical carbon dioxide under different supercritical conditions was investigated by using supercritical extraction device. It was measured ranged from 308.15K to 328.15K for supercritical temperature, and 10 MPa to 30MPa for pressure. The solubility data of metal complexes were correlated and a mathematical model was put forward from a viewpoint of solvent association theory compared to Chrastil’s model. The results showed that SA model gives fairly good agreement with the experiment data.

Abstract: In this experiment, we use the removal rate of COD as index to optimize membrane composition and operating parameters formula by 3 stage countercurrent liquid membrane extraction and also study the influence of different water to emulsion R_ew on COD removal rate .The experiments showed that R_ew and the external phase pH have significant effects on the removal rate of COD and the total removal rate of COD reached 85.3% when R_ew=1:1.0 under the condition of 3 stage countercurrent extraction.

Abstract: Supercritical CO2 chelating-extraction was applied to remove heavy metal matter such as Pb, As and Hg from calcium lactate, and the effect of process parameters on removal efficiency were investigated including chelating agent, ethanol (as a modifier), temperature, extraction pressure and time. The results showed that the removal efficiency of trace heavy metals is obviously different from chelating agent, modifier and extraction time, thus the concentration of modifier and extraction pressure give little influence. The extraction process was optimized to get the condition of a temperature of 323.15K, a pressure of 20MPa, an extraction time of 90min, a supercritical CO2 fluid flow rate of 13l/h and 2% of the chelating agent mixtures combined with tetrabutyl bromide and sodium diethyldithiocarbamate (DDC). The maximum yield of Pb, As and Hg can reach 88.41%, 78.57% and 86.21%, respectively.