Decreasing Easily Slimed Gangue Minerals Effect on Copper-Nickel Bulk Flotation by Combinatorial Depressants

2012 ◽  
Vol 616-618 ◽  
pp. 610-613 ◽  
Author(s):  
Qing Li ◽  
Bao Liang Ge ◽  
Jie Liu ◽  
Chao Zhu
Keyword(s):  
Sodium Silicate ◽  
Carboxymethyl Cellulose ◽  
Promising Method ◽  
Low Grade ◽  
Undesirable Effect ◽  
Copper Nickel ◽  
Negative Effect

This article research a low grade ore in Jinping, it contain 0.634% nickel, 0.329% copper, 0.047% cobalt, 30.18% SiO2, and 19.72% MgO. The rude ore contain amount of gangue minerals such as chlorite, mica, quartz, feldspar, which are easily slimed and have undesirable effect on flotation. In order to decrease such negative effect, this article investigated a method by “desliming-flotation” test, flotation test. Finally find that direct flotation is a promising method when utilizing carboxymethyl cellulose and sodium silicate as combinatorial depressants. And obtained the grade of bulk concentrate is 2.96% with recovery 60.82%, the recovery increased 2.43% compare with “desliming-flotation” test.

scholarly journals A new expansion material used for roof-contacted filling based on smelting slag

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hua Na ◽  
Guocheng Lv ◽  
Lijuan Wang ◽  
Libing Liao ◽  
Dan Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Peroxide ◽  
Compressive Strength ◽  
Sodium Silicate ◽  
Utilization Rate ◽  
Ammonium Bromide ◽  
Foaming Agent ◽  
Copper Nickel ◽  
Smelting Slag ◽  
Nickel Smelting

AbstractThe improper handling of smelting slag will seriously pollute the environment, and the unfilled roof of the goaf of the mine will threaten the safety of the mine. Expansion materials have attracted more and more attention because of their excellent properties. In this paper, copper-nickel smelting slag that has some active ingredients of gelling is used instead of traditional aggregate and some part of cement in order to reduce its pollution to the environment and its costs. For safety reasons, hydrogen peroxide was chosen as the foaming agent. Sodium silicate and hexadecyl trimethyl ammonium bromide (CTAB) are used as additives. Our results showed that after 28 days of curing, the material has better mechanical properties and the early compressive strength of the material was enhanced by sodium silicate. The efficiency of foaming was improved by CTAB. It also proves that copper–nickel smelting slag can be used in expansion material. At the same time, the utilization rate of the copper–nickel smelting slag of this formula can reach 70%, reduce its pollution to the environment.

Longer duration of symptoms at the time of presentation is not associated with worse survival in primary bone sarcoma

2018 ◽  
Vol 100-B (5) ◽  
pp. 652-661 ◽  
Author(s):  
J. M. Lawrenz ◽  
J. F. Styron ◽  
M. Parry ◽  
R. J. Grimer ◽  
N. W. Mesko
Keyword(s):  
Overall Survival ◽  
Proportional Hazards ◽  
Bone Sarcoma ◽  
Axial Skeleton ◽  
Cox Proportional Hazards ◽  
Low Grade ◽  
Duration Of Symptoms ◽  
Negative Effect ◽  
Primary Bone Sarcoma ◽  
Primary Bone

Aims The primary aim of this study was to determine the effect of the duration of symptoms (DOS) prior to diagnosis on the overall survival in patients with a primary bone sarcoma. Patients and Methods In a retrospective analysis of a sarcoma database at a single institution between 1990 and 2014, we identified 1446 patients with non-metastatic and 346 with metastatic bone sarcoma. Low-grade types of tumour were excluded. Our data included the demographics of the patients, the characteristics of the tumour, and the survival outcome of patients. Cox proportional hazards analysis and Kaplan–Meier survival analysis were performed, and the survivorship of the non-metastatic and metastatic cohorts were compared. Results In the non-metastatic cohort, a longer DOS was associated with a slightly more favourable survival (hazard ratio (HR) 0.996, 95% confidence interval (CI) 0.994 to 0.998, p < 0.001). In all types of tumour, there was no difference in survival between patients with a DOS of greater than four months and those with a DOS of less than four months (p = 0.566). There was no correlation between the year of diagnosis and survival (p = 0.741). A diagnosis of chondrosarcoma (HR 0.636, 95% CI 0.474 to 0.854, p = 0.003) had the strongest positive effect on survival, while location in the axial skeleton (HR 1.76, 95% CI 1.36 to 2.29, p < 0.001) had the strongest negative effect on survival. Larger size of tumour (HR 1.05, 95% CI 1.03 to 1.06, p < 0.001) and increased age of the patient (HR 1.02, 95% CI 1.01 to 1.03, p < 0.001) had a slightly negative effect on survival. Metastatic and non-metastatic cohorts had similar median DOS (16 weeks, p = 0.277), although the median survival (15.5 months vs 41 months) and rates of survival at one year (69% vs 89%) and five years (20% vs 59%) were significantly shorter in the metastatic cohort. Conclusion A longer DOS prior to diagnosis is not associated with a poorer overall survival in patients with a primary bone sarcoma. Location in the axial skeleton remains the strongest predictor of a worse prognosis. This may be helpful in counselling patients referred for evaluation on a delayed basis. Cite this article: Bone Joint J 2018;100-B:652–61.

377. Corrosion by commercial sodium hypochlorites and its inhibition

1949 ◽  
Vol 16 (1) ◽  
pp. 23-38 ◽  
Author(s):  
G. H. Botham ◽  
G. A. Dummett
Keyword(s):  
Stainless Steel ◽  
Sodium Silicate ◽  
Sodium Hypochlorite ◽  
Storage Conditions ◽  
Simple Equation ◽  
Nickel Silver ◽  
Copper Nickel ◽  
Dairy Equipment ◽  
Cast Stainless Steel ◽  
Bactericidal Efficiency

Commercial sodium hypochlorites, whether containing KMnO4 or not, are shown to be corrosive at 150 p.p.m. available chlorine and 40° C. to metals such as aluminium, tinned copper, nickel silver and cast stainless steel (18 Cr, 8 Cu, 3 Mo) which are used in dairy equipment. Hypochlorites containing KMnO4 when aged are potentially dangerous to wrought 18/8 stainless steel. The attack is by pitting and therefore especially dangerous to all the metals investigated, and, in general, increases with increase of time of exposure and temperature.Decay of sodium hypochlorite solutions results in conversion of NaOCl to NaCl and NaC103, which reaction is shown to follow a simple equation fairly closely in various storage conditions.Attack on metals by sodium hypochlorite can be efficiently inhibited by addition of sodium silicate, which has a specific action in addition to the effect exerted by increase of alkalinity. NaOH and Na2CO3 additions to the same pH are not so effective and increase attack on aluminium.Increase of pH from 9 to 10·5 by addition of Na2CO3 or sodium silicate reduces bactericidal efficiency of hypochlorites to the same extent.

scholarly journals Effect of Soil and Foliar Silicon Application on the Reduction of Zinc Toxicity in Wheat

Agriculture ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 522 ◽  
Author(s):  
Aleksandra Zajaczkowska ◽  
Jolanta Korzeniowska ◽  
Urszula Sienkiewicz-Cholewa
Keyword(s):  
Sodium Silicate ◽  
Plant Biomass ◽  
Foliar Application ◽  
Zinc Toxicity ◽  
Soil Application ◽  
Zn Concentration ◽  
Drastic Increase ◽  
Applied Dose ◽  
Negative Effect ◽  
Si Content

The aim of the study was to compare soil and foliar application of Si to relieve stress in wheat caused by excess Zn in the soil. Two pot experiments were carried out in which the soil was contaminated with zinc sulphate at the dose of 600 mg kg−1 Zn before sowing. Si was applied in the soil in the following doses 200 mg kg−1 and 400 mg kg−1 Si and as foliar spraying in concentrations 2 mM L−1 and 6 mM L−1 Si in the form of sodium silicate. The applied dose of Zn was toxic to wheat and caused a significant decrease in the biomass of shoots and roots. Soil application of Si reduced the negative effect of Zn on plants and significantly increased the biomass of the tested organs. The foliar application of Si did not reduce the decrease of plant biomass. Soil contamination with Zn caused a drastic increase in Zn concentration in shoots and roots, while Si applied in the soil significantly decreased this concentration. The increase in soil pH, which was caused by sodium silicate, also affected the decrease in Zn concentration in plants. The plants absorbed Si applied to the soil, which is indicated by an increase in the Si content in shoots compared to the control. In the case of foliar spraying, only a higher dose of Si increased its concentration in the plants. The application of Si in the soil, in contrast to foliar application, reduced the transfer of Zn from roots to shoots. The higher effectiveness of soil application of Si than foliar application in alleviating the toxicity of Zn was associated with both an increase in pH and a higher uptake of Si by plants.

Leaching of a low-grade, copper–nickel sulfide ore

2009 ◽  
Vol 98 (1-2) ◽  
pp. 66-72 ◽  
Author(s):  
M. Maley ◽  
W. van Bronswijk ◽  
H.R. Watling
Keyword(s):  
Nickel Sulfide ◽  
Low Grade ◽  
Copper Nickel ◽  
Sulfide Ore

scholarly journals An In Vitro Model of Gastric Inflammation and Treatment with Cobalamin

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
T. R. Elliott ◽  
A. L. Guildford
Keyword(s):  
Nitric Oxide ◽  
Treatment Guidelines ◽  
Intrinsic Factor ◽  
Cell Activity ◽  
Pernicious Anaemia ◽  
Low Grade ◽  
Negative Effect ◽  
Low Grade Inflammation ◽  
Cobblestone Morphology

Pernicious anaemia (PA) is an autoimmune condition where antibodies target intrinsic factor and parietal cells, reducing the patient’s ability to absorb cobalamin promoting atrophic gastritis. Treatment guidelines are based on excretion data of hydroxocobalamin from healthy individuals obtained 50 years ago. This manuscript describes the use of phorbol 12-myristate 13-acetate (PMA) to stimulate low grade inflammation in an epithelial colorectal cell line to assess the efficacy of methylcobalamin and hydroxocobalamin. Nitric oxide increased significantly in cells exposed to higher doses of PMA (100 ng/ml, 150 ng/ml, and 200 ng/ml) accompanied by a loss of the characteristic cobblestone morphology with no negative effect on cell activity or viability. A significant reduction in nitric oxide production was associated with the addition of 200 pg/ml hydroxocobalamin, alongside a return to the characteristic cobblestone morphology. This study highlights the use of PMA to promote low grade inflammation in human cell lines to model gastric inflammation associated with autoimmunity; furthermore it raises questions regarding the concentration of cobalamin administered clinically to restore cell functionality, feasibly allowing the patient to receive reduced quantity of the vitamin more regularly, providing the patient with levels which are akin to dietary intake.

Research on the Flotation of Low Grade Copper-Nickle Ore

2014 ◽  
Vol 989-994 ◽  
pp. 1411-1414
Author(s):  
Zheng Bin Deng ◽  
Xiong Tong ◽  
Xiao Wang ◽  
Qing Yan Zhao ◽  
Xian Xie ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Low Grade ◽  
High Quality ◽  
Pine Oil

Effect of grinding fineness and inhibitors on mixed flotation of low copper and nickel were studied and a new nickel inhibitor YS was used in the process of separation of copper and nickel. The results indicated that the high-quality mixed concentrate with the recoveries of Cu and Ni 76% and 65.6% and the grade of Cu and Ni were 4.66% and 4.3%, respectively, was got under the condition of sodium silicate (200 g/t), CMC (200 g/t), copper sulphate200 g/t, amyl xanthate 100 g/t and pine oil 30 g/t with the grinding fineness of-0.074mm80%. Then, Qualified Cu concentrate with the grade26.65% and recovery 55.62%, Qualified Ni concentrate with the grade26.65% and recovery 55.62%, respectively, were got by using the new nickel inhibitor YS in the separation flotation of copper and nickel.

Autoclave processing of low grade copper-nickel concentrates

1995 ◽  
Vol 39 (1-3) ◽  
pp. 223-234 ◽  
Author(s):  
A. Kosyakov ◽  
M. Hamalainen ◽  
P. Gromov ◽  
A. Kasikov ◽  
V. Masloboev ◽  
...  
Keyword(s):  
Low Grade ◽  
Copper Nickel

Research on the Flotation Experiment of a Low-Grade Barite Ore in Myanmar

2014 ◽  
Vol 644-650 ◽  
pp. 5277-5280 ◽  
Author(s):  
Hong Jun Wang ◽  
Hui Xin Dai ◽  
Wei Lin Yang ◽  
Ting Ting Li
Keyword(s):  
Sodium Silicate ◽  
Sodium Oleate ◽  
Low Grade

This paper introduces the research on the beneficiation of a low-grade barite ore taken from Myanmar.Through the analysis of the ore properties and research on the flotation experiment, the optimum flotation conditions are determinedwhile the ore sample assays 64.32% BaSO4.Under the flotation conditions of the grinding fineness-200 meshes 80%, sodium oleate 800g / t and sodium silicate 500 g / t, “two-time roughing,one closed cleaningand open in the second cleaning operations” is applied, and two marketable barite concentrates can be obtained. The concentrate 1 and 2 contain 96.32% and 91.26%BaSO4 at the recoveries of 91.94% and 5.25%, respectively.

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