Question

求英语大神翻译（可加分）。

Magnetic separation has been for almost 200 years in the concentration of ironores, and is still used extensively today. A wide variety of devices have been used. Since the start of this century there has been a steady expansion in both the equ-ipment available and the range of ores for which magnetic separation is applica-ble. The removal of small amounts of iron and iron-bearing minerals from indu-strial minerals has become an important application, as has the concentration of various ferrous and nonferrous minerals. The forces in magnetic separators that compete with magnetic forces and act on all particles are gravity, hydrodynamic drag, friction and inertia. If the sepa-ration is occurring at the surface of rotating drum, the centrifugal force may also be a factor. One may call all of then the competing force. It is when the following rela-tionship exists the separation of strongly magnetic mineral particles from weakly magnetic mineral particles can take place
F(lmag)>F(comp)>F(2mag)
where F1mag is the magnetic force on strongly magnetic mineral particles, F2mag is the magnetic force on weakly magnetic mineral particles, Fcomp is the total competing forces. Ferromagnetism can be regarded as a special case of paramagnetism, involving very high forces. Ferromagnetic materials have very high susceptibility to magn-etic forces and retain some magnetism when removed from the field (remanenc-e). They can be concentrated in low-intensity magnetic separators and the princ-ipal ferromagnetic mineral separated is magnetite (Fe3O4 ) , although hematite (Fe2O3) and siderite (FeCO3) can be roasted to produce magnetite and hence give good separation. The removal of "tramp" iron from ores can also be regarded as a form of low-intensity magnegtic separation.

Answer 1

Magnetic separation has been for almost 200years in the concentration of ironores, and is still used extensively today.
用来分选矿物的磁选工艺已有近200年的历史，至今仍被广泛应用。

A wide variety of devices have been used.
磁选机种类多样。

Since the start of this century there has
been a steady expansion in both the equ-ipment available and the range of ores
for which magnetic separation is applica-ble.
本世纪初以来，磁选机种类以及能够运用磁选技术的矿物种类不断增多。

The removal of small amounts of iron and
iron-bearing minerals from indu-strial minerals has become an important
application, as has the concentration of various ferrous and nonferrous
minerals.
磁选工艺除用作分选各种含铁矿物与有色金属，还有一个重要作用：筛选出工业矿物中的铁及含铁矿物。

The forces in magnetic separators that
compete with magnetic forces and act on all particles are gravity, hydrodynamic
drag, friction and inertia.
在磁选机内，矿物颗粒除受到磁力影响，重力、流体阻力、摩擦力、惯性等的作用力也不容忽视。

If the separation is occurring at thesurface of rotating drum, the centrifugal force may also be a factor.
若采用鼓形磁选机，矿物颗粒在转鼓内还会受到离心力的影响。

One may call all of them the competingforce.
有人认为，上述所有作用力相互抵消。

It is when the following relationship
exists, the separation of strongly magnetic mineral particles from weakly
magnetic mineral particles can take place
F(lmag)>F(comp)>F(2mag)
where
F1mag is the magnetic force on
strongly magnetic mineral particles, F2mag is the magnetic force on weakly
magnetic mineral particles, Fcomp is the total competing forces.
只有满足下列条件，强磁性矿物颗粒才能与弱磁性矿物才会被分选开来，即
F(lmag)>F(comp)>F(2mag)
其中，F(lmag)指强磁性矿物受到的磁力，F(2mag)指弱磁性矿物受到的磁力，F(comp)指各种作用力的总和。

Ferromagnetism can be regarded as a specialcase of paramagnetism, involving very high forces.
铁磁性是顺磁性的一种，磁力强度很大。

Ferromagnetic materials have very high
susceptibility to magn-etic forces and retain some magnetism when removed from
the field (remanence).
铁磁性材料易受磁力影响，去除磁场后会保留部分磁性，称作剩磁。

They can be concentrated in low-intensity
magnetic separators and the principal ferromagnetic mineral separated is
magnetite (Fe3O4 ) , although hematite (Fe2O3) and siderite (FeCO3) can be
roasted to produce magnetite and hence give good separation.
铁磁性材料能够利用弱磁场磁选机进行筛选，其中最常见的强磁性矿物是磁石矿（Fe3O4）。此外，赤铁矿(Fe2O3)与菱铁矿(FeCO3)热处理后会产生磁性矿物，同样可以使用弱磁场磁选机。
The removal of "tramp" iron fromores can also be regarded as a form of low-intensity magnegtic separation.
将混杂铁块从其他矿石中分离出来也是利用弱磁场磁选机筛选。

Answer 2

一直是近200年磁分离中的浓度ironores，仍然是广泛使用的今天。各种各样的装置已被使用。自本世纪开始以来一直在稳步扩张中的EQU ipment和矿石磁选应用表的范围。除去少量的铁和含铁矿物从引发血管纹矿物已成为一个重要的应用，因为有各种黑色金属和有色金属矿物的浓度。在竞争磁选机，磁力和行动上的所有粒子的重力，流体阻力，摩擦力和惯性的力量。如果单独的口粮发生在旋转滚筒的表面上，在离心力的作用也可能是一个因素。可以调用所有的竞争力。
（lmag）这是当存在如下关系关系从弱磁性矿物颗粒的强磁性矿物颗粒的分离，可以发生F> F（COMP）> F（2mag）
F1mag是磁力强磁性矿物颗粒， F2mag是弱磁性矿物颗粒上的磁力中，FCOMP是总的竞争力。铁磁性可以被视为一个特殊的情况下，顺磁性，涉及到非常高的力量。铁磁材料具有很高的敏感性MAGN-ETIC的力量，并保留一些磁性的的字段（remanenc-E）从。它们可以在低强度磁选机浓缩和分离PRINC IPAL铁磁矿物是磁铁矿（Fe3O4），赤铁矿（Fe2O3），菱铁矿（FeCO3）虽然可以烤生产磁铁矿，从而得到良好的分离。“流浪者”，从矿石中铁的去除，也可视为一种形式的低强度magnegtic的分离。

Answer 3

这篇文章是国人写的，句法章节很乱，基本是词汇的罗列，文章的大意如下：

磁分离技术在铁矿汰选方面已使用200年了，目前仍广泛地使用。 目前已使用各种各样的设备。从这个世纪初，适用磁分离技术的设备种类稳步增长，可选矿的类型也稳步增加，主要是用从工业矿石中来去除少量的铁矿石和铁基矿物，它能汰选各种含铁或不含铁的矿石。
在磁分离机中，与磁力相互作用的是重力、流体阻力、摩擦力和惯性力，如果在分离机转鼓表面进行的话，还要考虑离心力。满足如下关系时，强磁颗粒能从弱磁颗粒中分离出来。
这里F1mag 是强磁力矿颗粒的磁力，F2mag弱磁力矿颗粒的磁力，铁磁性力做为顺磁性力， 也很大，铁磁材料有很高的磁化系数，当从磁场中移开时，还能保留一些剩磁。他们可用于低强度的分离机中，分离的主要的铁磁矿石是 磁铁矿Fe3O4 ，赤铁矿(Fe2O3) 和 菱铁矿(FeCO3) 可以通过烘烤产生磁性，有很好的分离性能。可以采用低强度的磁分选技术从矿石中清除游离的铁矿石。

Answer 4

磁分离（磁选）工艺已经出现（发明）了近200年了

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别捣乱

Answer 5

磁铁分离法已经存在200多年了。