The use of new crushing processes and selection of large -scale and efficient crushing equipment to strengthen crushing operations, reducing the particle grainness of abrasives, is an important way to improve the efficiency of fragmented milling and reduce the cost of mineral selection. It is also the basic principle that designing and considering the design of mining factories should follow and consider.Let me introduce it in detail below!
Prepare homework before selection
In order to select useful minerals from the ore, the ore must be crushed first so that the useful minerals and the single separation when buying.Sometimes, in order to meet the requirements of subsequent operations on the granularity of the material, a certain crushing operation is required in the middle.Preparatory preparations are usually carried out by two stages: crushing and screening operations and mineral grading operations.Most of the crusher and screening machine are joint operations, and the abrasive machine and classifiers often form a closed circulation.They are the main machinery and equipment that forms a crushing workshop and the election workshop.[3]
Broken: Mine blocks with a particle size of the mine from 500 to 1500mm are broken to 5 to 25mm.The methods are crushed, crushed, split, etc., generally three sections of rough, medium crushing, and fine crushing.
Glip: Mainly grinding and impact.The crushing products are grinded to the size of 10 to 300 μm.The grinding particle size is determined according to the granularity and selection method used in the ore in the ore.Commonly used abrasive equipment are: rod mill, ball mill, self -grinding machine and semi -self -grinding machine.The high energy consumption of grinding operations usually accounts for about half of the total energy consumption.Since the 1980s, various new types of lining and other measures have been applied. The grinding efficiency has been improved and energy consumption has decreased.
Screening grading: The size of the sieve surface sieve is divided into different particle size levels for screening, which is commonly used to treat thick -grained materials.According to the different sinking speed of particles in the medium (usually water), the material is divided into different levels of levels.Sieving and grading are materials with appropriate particle size during the crushing process, or the materials are divided into different particle size levels separately.
Mine washing: In order to avoid crushing and sieving equipment in mud containing mine ingredients, mines need to be washed.If raw materials contain soluble and useful or harmful ingredients, mines should also be carried out.Mining can be performed in the scrubbing machine, or in screening and grading equipment.
Mining process
The mineral processing process of ore was completed in the minerals.Generally, the following three basic processes are included.
(1) Preparation of preparations before it.Including crushing, screening, grinding, grading and other processes of raw ore (raw coal).The purpose of this process is to separate the useful mineral and pulse mineral monomer, and to unlock various useful minerals between the monomers of minemals. In addition, this process also creates appropriate conditions for the next step of the separation of the mineral selection.According to the nature of the ore and the needs of the sorting, some of the mineral selection factories have a washing ore and pre -selected throwing stone operations before sorting.
(2) Sub -assignment.With the help of re -selection, magnetic selection, electrical selection, flotation and other mineral selection methods, there will be useful minerals with the same vein stone, and the use of minerals can be separated from each other to obtain final mineral selection products (concentrate, tailings, and sometimes producing Chinese ore).In the assignment operation, the selection of the beginning is called Rougher; further selection of the rich products obtained by the rough selection to obtain a high -quality final product concentrate selection operation is called a selection; it will be selected;After the rough selection, the poor products are further selected, and the Chinese ore returns rough selection or separate processing to obtain a higher recovery rate.Essence
(3) The processing operation of the product after selection.Including dehydration of various concentrates and tailings, the precipitation, filtration, drying, and water washing of fine -grained materials to clarify recycling of recycling.
Mining theory
In 1867, P.R.Von Rit-Tinger wrote "Mineral Election", which initially formed a mineral selection system.In 1903 (R.H.richards), "Mining", which constituted an independent mining engineering.In 1933, Libabins (..eep) wrote "Physical Chemistry of Floating Process", 1939 <A.M.GAUDIN) in "Principles of Mining", 1940 Liaxia (..) "Gravity Gravity)Mining ", in 1944 <A.F.Tagggart (A.F.TAGGGART)," Mining Manual ", in 1950, D.R. Mitschell and" Coal Selection "to form an independent discipline.Since the 1950s, it has developed greatly.The main disciplines involved in mineral selection are: mineral crystalline, fluid dynamics, electromagnetics, physical chemistry, surface chemistry, applied mathematics, and process mathematical simulation and automatic control.
In the 1920s, China appeared in mechanical mining plants, such as Hunan Mizukou Mining Plant.After 1949, it has developed greatly in terms of mineral indicators, processing volume and mining science and technology.Mining technologies such as tungsten and tin have a high level in some ways, creating new equipment such as unique centrifugal selection machines, vibrations, and ring-ranging machines.Copper oxide.
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