MUKANDA MUKUNA Trésor1,5, KAPYA TSHINANGI Fabrice2, MANENE NGOIE Francine3,4, KABUNDA TSHIBANGU Henri4, ZEKA MUJINGA Léon4,5*

Impact of Washing Leach Solutions Using SHELLSOL 2325 Diluent on Copper Solvent Extraction at Luita plants in D.R. Congo.

The significance of pre-treatment by washing using Shellsol 2325 diluent was investigated on heap leach solutions of oxidized ores from Luita plants. These solutions contained as metal of value 14 g/L Cu and as impurities to be removed by washing 487 ppm of dissolved silica and 550 ppm of suspended solids. The washed solutions were then treated to solvent extraction. The results showed that increasing the PO/PA ratio and the stirring speed led to the increase in the washing impurity removal efficiency with a minimum removal efficiency of 57%. The solutions washed in organic continuity led to lower values of phase disengagement time during copper extraction than those performed in aqueous continuity. By pre-treating the solutions by washing in organic continuity in this way, the washing showed a positive effect regardless of the continuity used in the copper solvent extraction on copper efficiency. The study of the contact time, the PO/PA ratio and the pH showed that their increase leads to an increase in the extraction yield with a maximum efficiency of 98.4 % Cu. On the other hand, considering the disengagement time, the washing showed only a net advantage for the case of copper extraction in aqueous continuity and is little influenced in organic continuity. Washing is therefore of considerable interest in ensuring the performance of the solvent extraction circuit at Luita plant. Télécharger l'article

ILITO LOFONGO Daddy Patrick1*, KANDOLO KASEME Candice 1, MULUMBA KALAMBAY Alex1, INKIBA BATOKO Arsene2, MWANZA KANT Patrick1

Physico-Chemical Properties of Sand Deposits in Madimba Territory (Kongo Central), Favorable for Glass Industry.

The study consists in the determination of the physico-chemical properties of the sands in three deposits (Ngufu, Ngeba,Kimpemba) in the Madimba territory in Kongo Central province in order to assess their use in the glass industry. Essential elements usable in glassware are chemical composition, particle size, moisture, and loss to fire. Documentary work and photo- interpretation techniques enabled the selection of target sites. Sedimentological, particle size and chemical analysis of oxides were used. It was found that more than 80% of the particles in collected samples have their size between 0.71 mm to 0.1 mm ; an average of 98.9058% sand , 0.55% clay and 0.53% silt. These sands have a low fire loss with an average of 0.08% or 0.1%. Humidity is less than 1% ; it may increases with depth because of the influence of groundwater. The results of chemical analysis of oxides give respective a mean contents of SiO2 :98.9725%; Fe2O3 :0.0275%; Cr2O3 :0.0075%; TiO2 :0.0358; CaO :0.0658% ; MgO :0.0217%; K2O :0.0200% and MnO :0.0125%. The content of silica, SiO2>98.9% shows that these sands are pure and have only low levels of impurities; hence their physico-chemical properties are favorable to glassware. Télécharger l'article

KALALA BOLOKANGO Gaétan2, 3*, PHANZU MBUNDU Maurice1, MVAKA MVANDA Jean Robert4, YENGO MUTU Moïse1, MATITI Guelord2

Effect of Protein Doses in Rations Based on Local Ingredients on the Growth of Oreochromis niloticus in Tropical Environment.

This study aims to develop a feed that increases weight gain in breeding Oreochromis niloticus. Performance of experimental feeds on the growth of Oreochromis niloticus in 6 happas of 1m3 in size was tested. Ninety finger lings of 17 g of average weight each were used for this experiment. The 3 rations with different protein contents are: T1: 30% crude protein, T2: 40% crude protein, T3: 50% crude protein. The data collected was analyzed with S.A.S 9.4 USA software. All study parameters showed no significant differences between the different treatments. However, all three rations showed good growth performance of Oreochromis niloticus. Although the difference was not significant between the treatments in terms of growth parameters, a clear difference can be seen at the cost of producing a kilogram of fish, T3 has a greater economic benefit. Télécharger l'article

MBAA MAZEYI Glodi*, N’SINABAU EYAY Raïs, KASAI HUMBU Fontaine, MAGOGA KUMBUNDU Mago, MWAMPINA MPO Lydie

Survey on the Consumption of Labile Blood Products in a Pediatric Unit: Case of the General Reference Hospital of N’djili / ISTM-Kinshasa.

In the Democratic Republic of Congo, according to the National Blood Transfusion Center report of 2013, large quantities of blood were transfused and pediatric services accounted for the vast majority of its consumption. This work aims to take stock of the consumption of blood products in the pediatric emergency department. A descriptive study based on patients records who received blood transfusion in the pediatric emergency department of the General Reference Hospital of N’djili / ISTM-Kinshasa was carried out from January 1 to December 31, 2017. The frequency of blood transfusion was 36.9% in one year. The 0 to 4 years old group was the most affected by blood transfusion (60.1%) with a predominance of males (52.9%). The transferred patients (49.3%) and those who benefited from self-medication at home before the consultation (48.6%) were the most affected by blood transfusion. Severe malaria with anemia dominated the table of conditions requiring transfusion (90.9%) and the majority of transfusions were made on the basis of clinical intolerance (59.4%). The pre-transfusion workup included hematocrit and / or hemoglobin, ABO blood group and Rhesus factor. Red blood cell concentrate was the most widely used blood product (97.1%). The mortality rate in transfused patients was high (29.0%) and the majority of transfused patients did not receive post-transfusion follow-up (81.9%). Epidemiological survey on the consumption of labile blood product showed a high frequency of blood transfusion in the pediatric emergency department. Télécharger l'article

LUKOMBO LUKEBA Jean-Claude1,2, MUMBA DJAMBA Antoine1,2, MVUNZI NSIMBA Joël3, BWAMAMEYI Marcel1,2, MUDIBU wa KABANGU Justin1, 4

Determinants of Adoption and Strategies to Promote Agroforestry in Central Africa

Surveys targeting peasant producers and concessionaires were conducted in the Batéké Plateau (Dumi, Inzolo, Ibi, Mutiene and Mbankana villages) in DR Congo to determine the factors explaining the motivation for adopting agroforestry. The logistic regression revealed that the level of education, the size of the holding and the membership of a producers' association positively influence the adoption of agroforestry among farmers. For the concessionaires, it is land management, labor, market access, and perception of profitability of agroforestry, knowledge of agroforestry, contact with an extension service, extension of agroforestry and the existence of agroforestry expertise at the local level. The factors that hamper the adoption of agroforestry are: female sex, advanced age, lack of land ownership, long experience in the trade, size of the farm, labor force, access to the market, perception of agroforestry, lack of knowledge about agroforestry, lack of agroforestry extension, lack of knowledge of local expertise, farmers not belonging to a local structure.Télécharger l'article