Cleaning high ash coal waste from coking coal via froth flotation method

Author(s):  
Shiwei Wang ◽  
Qian Xia ◽  
Ruyou Gao
2018 ◽  
Vol 115 (2) ◽  
pp. 209
Author(s):  
Debjani Nag ◽  
P. Kopparthi ◽  
P.S. Dash ◽  
V.K. Saxena ◽  
S. Chandra

Macerals in coal are of different types: reactive and inert. These macerals are differ in their physical and chemical properties. Column flotation method has been used to separate the reactive macerals in a non-coking coal. The enriched coal is then characterized in order to understand the changes in the coking potential by different techniques. It is then used in making of metallurgical coke by proper blending with other coals. Enriched coal enhance the properties of metallurgical coke. This shows a path of utilization of non-coking coal in metallurgical coke making.


1943 ◽  
Vol 21b (10) ◽  
pp. 195-201 ◽  
Author(s):  
Wm. T. Turrall ◽  
H. Smedley ◽  
J. Klassen

Application of the froth flotation methods used in mineral dressing operations to the separation of rubber–resin fractions of milkweed offers hope of placing the extraction of such plant materials on a continuous rather than a batch basis. When the flotation method was used, no chemical treatment or flotation agents were necessary for the separation of rubber–resin from milkweed, though additional flotation reagents were found necessary for some other plants. The rubber–resin components of all plants studied, namely, milkweed, dogbane, goat's-beard, sow thistle, and wild lettuce, were successfully concentrated.Under favourable conditions rubber–resins may not agglomerate during ball-milling; in some instances the flotation method can be used for the separation of the dispersed rubber–resin.


Minerals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 70
Author(s):  
Kudzai G. Chiodza ◽  
Susan T. L. Harrison ◽  
Marijke A. Fagan-Endres

Raw algal lipids (RALs) and their derivatives (fatty acid methyl esters; FAMEs) were investigated as biocollectors for the recovery of coal from ash-rich fine coal waste by froth flotation. Testing was done on fine coal discards from two South African sites—a high ash (50%), high sulphur (5.7%) sample and a lower ash (26%), low sulphur (0.91%) sample. The yield and recovery of combustibles on using biocollectors was similar to, or better than, with oleic acid, a polar collector demonstrated as a good collector in previous research. The RALs and FAMEs reduced the ash and sulphur content of the combustible fraction of the high ash-high sulphur sample to between 23–28% and 1.9–3.3%, respectively. The chemical modification of RALs to FAMEs provided potential for improving the selectivity of the recovery of combustibles. It also resulted in a change of the optimum operating pH, with RALs yielding better results at the natural pH of the sample (pH 2.7), while FAMEs performed best at pH 7.


2011 ◽  
Vol 361-363 ◽  
pp. 301-304 ◽  
Author(s):  
Xiu Ming Hu ◽  
Rui Chen Ren ◽  
Cai Xia Li

The status of coking coal resources and the utilization of the middlings of coking coal are analyzed in this paper, and the necessity and practicability of middlings’ rewashing is held up. Middlings of BaBao Industrial Park Coal Preparation Plant is used as sample of experiment test, through size analysis and float-and-sink test, the feasibility of middlings’ rewash is demonstrated. Two kindes of separation processes are presented : ⑴crushing-coarse and thin slime are separated separately; ⑵crushing-grinding-froth flotation. Scheme 2 is appropriate for the separation of Babao middings.Experiments confirm that the scheme 2 would be more suitable for the middlings’ separation, and the cleaned coal’s production rate of is 31.88% , the ash content is 14.4%. So there are high social benefits and economic benefits. Reclean middlings of coking coal is a new direction for the protection of coking coal resources, in the meantime, it comply with the environmental requirements and is an important measure to realize the sustainable development.


Author(s):  
Zagarzusem Ts ◽  
Sugir-Erdene N ◽  
Orgilbayar B ◽  
Sukhbat S ◽  
Soyolmaa Ts ◽  
...  

This study demonstrated the importance of appropriate flotation conditions and reagent dosage for the separation of standard manganese concentrates from low-grade manganese ores. The research object used Unagad manganese ore located in Dornogovi province. The main mineral of manganese ores was pyrolusite (MnO2). According to the chemical element analyses, the content of manganese in the primary ore was Mn-17.31%. XRD analyses revealed minerals such as quartz, pyrolusite, albite, anorthite, anorthoclase, orthoclase, and hausmannite. This study conducted the beneficiation of manganese ore by the froth flotation method. Manganese ore beneficiation tests were performed for the flotation method under the following conditions: the collector dosage with 900 g/t, 1100 g/t, 1300 g/t, 1500 g/t, and 1700 g/t, the dosage of the depressant as 570 g/t, 670 g/t, 770 g/t, and 870 g/t, and the frother with 900 g/t, pH value 8, the grade of -0.074 mm was 60%, 70%, 80%, 90% respectively. Beneficiation tests performed in the optimum conditions resulted in concentrate with Mn = 32.37%, the recovery was 57.33%, and the yield was 30%. As a result of the flotation enrichment of manganese ore, а concentrate containing 32.37% manganese was obtained. Манганы хүдрийг флотацийн аргаар баяжуулах технологийн судалгаа Хураангуй: Энэхүү судалгаагаар бага агуулгатай манганы хүдрээс стандартын шаардлага хангасан манганы баяжмалыг гарган авахад флотацийн зохистой горим, урвалжийн зарцуулалт хэрхэн нөлөөлж байгааг тогтоов. Судалгааны объектоор Дорноговь аймгийн нутагт орших Унагадын манганы ордын хүдрийг ашигласан бөгөөд хүдрийн голлох эрдэс нь пиролюзит юм. Элементүүдийн химийн шинжилгээгээр анхдагч хүдэр дэх манганы агуулга 17.31% байна. Рентген дифрактометрийн шинжилгээгээр кварц, пиролюзит, альбит, анортит, анортоклаз, ортоклаз, гаусманит зэрэг эрдсүүд байгаа нь тогтоогдсон. Манганы хүдрийг флотацийн аргаар баяжуулах цуврал туршилтуудыг цуглуулагчийн зарцуулалт 900 г/т, 1100 г/т, 1300 г/т, 1500 г/т, 1700 г/т, дарагчийн зарцуулалт 570 г/т, 670 г/т, 770 г/т, 870 г/т, хөөсрүүлэгч 900 г/т, рН-8, ширхэглэлийн хэмжээг -0.074 мм ангийн агуулга 60%, 70%, 80%, 90% гэсэн нөхцлүүдэд явуулсан. Туршилтын дүнд цуглуулагчийн хэмжээ 1500 г/т, хөөсрүүлэгч 900 г/т, дарагч 670 г/т, -0.074 мм ангийн агуулга 70%, рН-ийн утга 8 гэсэн хамгийн тохиромжит нөхцөлд баяжмал дахь металл авалт 57.33%, гарц 30% байж, харин Mn-ний агуулга 32.37%-тай баяжмал гарав. Түлхүүр үг: Манганы баяжмал, флотаци, олейны хүчил, натрийн силикат


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