المنتجات الساخنة
Selective Crushing of Run-of-Mine as an Important Part of the
网页2021年5月28日The significant difference between the crushing ability of the tested grains enables high efficiency of the selective crushing of run-of-mine, with very small losses in
Contact
How Oman’s Rocks Could Help Save the Planet The New York
网页2018年4月26日The rocks here in Oman are special, this scientist says. They remove planet-warming carbon dioxide from the air and turn it to stone. In theory, these rocks
Contact
Separation and recovery of iron impurity from a
网页2017年6月8日In this , a vanadium-bearing stone coal was leached with oxalic acid, which has the advantages of cheap biological sources and good environmental
Contact
Prospects for Omani coal ScienceDirect
网页1997年10月1日A coalfield, in excess of 120×10 6 tonnes of coal in situ, has been discovered at Al-Kamil in south-eastern Oman. The coal is classified as highly-volatile
Contact
Removal of mineral matter from bituminous coals by aqueous
网页1984年12月1日Minor mineral components are also partly removed. The spent leachants can be regenerated for recycling; the extracted minerals form a solid by-product. The
Contact
US1705456A Coal and rock separating mechanism Google
网页1. An apparatus for separating coal from stone and slate comprising a series of enclless conveyors, each conveyor receiving niaterialfrom another conveyor being at a
Contact
CN201061760Y Coal stone separator Google Patents
网页2007年5月10日Abstract. The utility model relates to a mining machine, in particular to a sorting machine for coal stones, which is adaptable for the application of coal producing
Contact
Pre-concentration of vanadium from stone coal by gravity
网页2013年6月10日In the present study, the focus is on a new process for pre-concentration of vanadium from stone coal by gravity separation thereby avoiding the interference from
Contact
Highly selective separation of vanadium over iron from
网页2017年1月25日In this study, a novel method was proposed to selectively recover vanadium from stone coal by oxalic acid leaching, while iron impurity in stone coal was
Contact
A novel approach for pre-concentrating vanadium from stone coal
网页2018年8月15日For example, Liu et al. used the gravity separation method to treat the stone coal ore, the V 2 O 5 grade can be improved from 0.81% to 1.02% and the recovery rate was 89.6% (Liu et al., 2016). Zhao et al. proposed a modified gravity separation method, although some minerals that consume acid can be removed, the grade of V 2 O
Contact
Source separation of V and Fe by two-stage selective leaching during
网页A method of two stage selective leaching for separation of V and Fe during V extraction from stone coal was developed. In the primary procedure stone coal was roasted in an inert atmosphere at 900 °C for 1 h, and then the roasted product was leached for Fe removal in 7% (vol%) H 2 SO 4 at 30 °C for 30 min when the liquid-to-solid ratio (L/S) was 3 : 1
Contact
Separation and recovery of iron impurity from a vanadium-bearing stone
网页2017年6月8日The vanadium-bearing stone coal was leached with oxalic acid, which has the advantages of cheap biological sources and good environmental compatibility. 80.5% of the vanadium can be recovered from the stone coal with a CaF 2 addition of 5 wt% as well as an oxalic acid dosage of 60 wt%, a leaching time of 4 h, a leaching temperature of 95
Contact
Prospects for Omani coal ScienceDirect
网页1997年10月1日Prospects for Omani coal. A coalfield, in excess of 120×10 tonnes of coal in situ, has been discovered at Al-Kamil in south-eastern Oman. The coal is classified as highly-volatile bituminous type-A, with an average calorific value of 27.5 GJ per tonne. Unfortunately, it has on average ∼5% by weight sulphur content and an ash content of
Contact
A review of processing technologies for vanadium extraction from stone coal
网页Due to the poor vanadium recovery of mineral processing, the extraction of vanadium from stone coal is directly carried out by metallurgical processes. Salt process, acid process and alkali process three types of stone coal leaching including nine technologies are introduced.
Contact
What Is Coal Preparation? Energy.gov
网页What Is Coal Preparation? • Coal preparation is the removal of undesirable material from the Run-of-Mine (ROM) coal by employing separation processes which are able to differentiate between the physical and surface properties of the coal and the impurities. Through coal preparation, a uniform product is achieved.
Contact
Source separation of V and Fe by two-stage selective leaching during V
网页2.2 Procedure Based on the thermodynamic analysis of the raw sample, the procedure of the two-stage selective leaching for separation of vanadium and Fe in stone coal is shown in Fig. 3.First, 200 g of raw stone coal was roasted with an SGL-1700 pipe furnace equipped with an HQZ-IV gas distribution system in N 2.The roasted products were
Contact
Pre-concentration of vanadium from stone coal by gravity separation
网页2013年6月10日According to the research of Ni et al. (2010), when vanadium grade is 0.7%, the production cost of 1 t V 2 O 5 from stone coal is 86,295 CNY. If the V 2 O 5 grade of raw material improved from 0.7% to 0.8%, the production cost of 1 t V 2 O 5 would decrease by about 4000 CNY and the profit increase by 29%. Further, over 60% of the
Contact
Highly selective separation of vanadium over iron from stone coal
网页2017年1月25日Introduction. Vanadium is a significant rare metal that is widely applied in ferrous and nonferrous alloys because of its physical properties such as high tensile strength, hardness, and fatigue resistance [1], [2], [3].In China, stone coal (also called black shale) is a special vanadium-bearing resource, and the gross reserve of vanadium in
Contact
Source separation of V and Fe by two-stage selective leaching
网页prevented Fe from entering the V leaching liquor, realizing source separation of V and Fe during V extraction from stone coal. 1 Introduction Stone coal, a type of V-bearing black shale, is an important vanadium resource in China due to its vast deposit amounts.1–3 Most of the V in stone coal exists as V(III) because of the
Contact
Enrichment of rare earth elements from coal and coal by
网页2017年7月15日The ash yields vary significantly depending on the type of samples. The coal combustion products contain 95–98% dry ash except sample 251 which contains 85%. The dry ash yields of both clay and shale samples are almost the same at about 93%. The coal sample has much lower mineral content resulting in only 7.8% dry ash.
Contact
Source separation of V and Fe by two-stage selective leaching during
网页A method of two stage selective leaching for separation of V and Fe during V extraction from stone coal was developed. In the primary procedure stone coal was roasted in an inert atmosphere at 900 °C for 1 h, and then the roasted product was leached for Fe removal in 7% (vol%) H 2 SO 4 at 30 °C for 30 min when the liquid-to-solid ratio (L/S) was 3 : 1
Contact
Recent progress and potential challenges in coal upgrading via
网页2021年12月1日Separation was conducted using autogenously formed media in the feed coal. The separation density was around 1.8-2.0 g/cm³ and the average Ep value ranged from 0.08-0.1 for the 5- 10 mm fraction
Contact
A review of processing technologies for vanadium extraction from stone coal
网页Due to the poor vanadium recovery of mineral processing, the extraction of vanadium from stone coal is directly carried out by metallurgical processes. Salt process, acid process and alkali process three types of stone coal leaching including nine technologies are introduced.
Contact
What Is Coal Preparation? Energy.gov
网页What Is Coal Preparation? • Coal preparation is the removal of undesirable material from the Run-of-Mine (ROM) coal by employing separation processes which are able to differentiate between the physical and surface properties of the coal and the impurities. Through coal preparation, a uniform product is achieved.
Contact
Source separation of V and Fe by two-stage selective leaching during V
网页Abstract. A method of two stage selective leaching for separation of V and Fe during V extraction from stone coal was developed. In the primary procedure stone coal was roasted in an inert atmosphere at 900 °C for 1 h, and then the roasted product was leached for Fe removal in 7% (vol%) H 2 SO 4 at 30 °C for 30 min when the liquid-to-solid ratio
Contact
Studies on Separation of Macerals from Coal by Froth Flotation
网页2017年1月1日These coal macerals have typical ranges of contact angles of 90-130°, 60-70° and 25-40° respectively (Arnold and Aplan, 1989). In another study (Sahoo et al., 2017a), coal macerals were
Contact
Pre-concentration of vanadium from stone coal by gravity separation
网页2013年6月10日According to the research of Ni et al. (2010), when vanadium grade is 0.7%, the production cost of 1 t V 2 O 5 from stone coal is 86,295 CNY. If the V 2 O 5 grade of raw material improved from 0.7% to 0.8%, the production cost of 1 t V 2 O 5 would decrease by about 4000 CNY and the profit increase by 29%. Further, over 60% of the
Contact
Source separation of V and Fe by two-stage selective leaching
网页prevented Fe from entering the V leaching liquor, realizing source separation of V and Fe during V extraction from stone coal. 1 Introduction Stone coal, a type of V-bearing black shale, is an important vanadium resource in China due to its vast deposit amounts.1–3 Most of the V in stone coal exists as V(III) because of the
Contact
Pre-concentration of vanadium from stone coal by gravity separation
网页2013年6月1日In the gravity separation stage, 28.9% of the feed ore were rejected as final tailings, while the V2O5 loss was 9.7%. The pre-concentration of vanadium from stone coal can improve the V2O5 grade
Contact