RU2063818C1 - Apparatus for preliminary concentration of sands - Google Patents

Abstract

FIELD: devices for preliminary concentration of mineral-containing sends in mineral concentration industry. SUBSTANCE: apparatus for preliminary concentration of sands includes cylindrical-conical body with conical screening surface, loading branch pipes connected tangentially to cylindrical surface of the body, and unloading branch pipes. Loading branch pipes are of different diameters and connected at some distance from one another which governs optimal sizes of sectors of coarse and fine screening with different passage holes. EFFECT: higher efficiency. 2 dwg

Description

 The invention relates to mining equipment, in particular to devices for the preliminary enrichment of mineral sands.

 Known conical hydraulic screen, including a cylindrical-conical housing with a conical screening surface, a loading pipe with a regulating gate and discharge pipes (ed. St. USSR N 1090458 from 08.02.83).

 The disadvantage of this device is the incomplete use of the working screening surface of the screen due to the uneven loading of the slurry in view of its unilateral supply.

 The closest in technical essence to the claimed device is a conical screen, including a cylindrical housing with a conical screening surface, a loading unit made in the form of a rotary pipe with two segmented nozzles and unloading nozzles (ed. St. USSR N 313576 from 08.26.68).

 The disadvantage of this device is the inability to pre-separate the slurry of rocks having different particle size distributions for different deposits into two fractions: large bottom and small upper, since the loading nozzles are made in the form of segment nozzles of the same diameter. In addition, the implementation of the screening surface as a whole does not allow fractionation of a separately large fraction and a separate fine fraction in its working space, which ultimately leads to an increase in losses of the small product, which is carried along with the large fraction into the sieve product and falls into dumps.

 The basis of the invention is the task of increasing the yield of minerals in the sublattice product.

Д_в.п.= Д_м Д_н.п.
и подсоединены на расстоянии L друг от друга:

где Д_ц диаметр цилиндрической части корпуса аппарата; Пδ_гр - процентное содержание фракций с размерами части, меньших размеров граничного - процентное содержание фракций с размерами части, меньших размеров граничного зерна δ_гр,, разделяя при этом рабочую поверхность грохота на два сектора, соответственно сектора мелкого и крупного грохочения с различными размерами проходных отверстий.The problem is solved in that in the apparatus for preliminary enrichment of sand, including a cylindrical conical body with a conical screening surface, loading nozzles connected tangentially to the cylindrical surface of the housing, discharge nozzles, according to the invention, the loading nozzles are made of different diameters in the form of upper and lower with respect to the horizontal the axis of the main pipeline, determined by the formula:

D _vp = D _m D _n.p.
and connected at a distance L from each other:

where D _{c the} diameter of the cylindrical part of the apparatus; Пδ _gr - percentage of fractions with part sizes smaller than the boundary - percentage of fractions with part sizes smaller than the boundary grain δ _gr , dividing the working surface of the screen into two sectors, respectively, small and large screening sectors with different sizes of through holes .

Д_в.н.= Д_м Д_нп,
предопределяет общую картину разделения частиц на крупную и мелкую фракции на рабочей поверхности грохота, а подсоединение их по касательной к цилиндрической поверхности грохота на расстоянии L друг от друга, являющегося функцией гранулометрического состава, подаваемого на грохот пород, разделяющего рабочую поверхность грохота на два сектора: соответственно сектора мелкого и крупного грохочения с различными размерами проходных отверстий, отличает заявляемое решение от прототипа и обуславливает соответствие этого технического решения критерию "Новизна".It is the implementation of the loading nozzles of various diameters, upper and lower with respect to the main pipeline, determined by the formula

Doctor of _Science = D _m D _np ,
determines the overall picture of the separation of particles into large and small fractions on the working surface of the screen, and connecting them tangentially to the cylindrical surface of the screen at a distance L from each other, which is a function of the particle size distribution supplied to the screen of rocks, dividing the working surface of the screen into two sectors: respectively sectors of small and large screening with different sizes of passage openings, distinguishes the claimed solution from the prototype and determines the conformity of this technical solution Iya criterion of "Novelty."

 The prior art devices with two-sided supply of slurry to the working volume of the screen along the loading nozzles with the same diameters that are set tangentially to the cylindrical surface of the housing along the flow rotation evenly around the circumference, however, devices with two-way supply of the slurry to the working volume along the loading nozzles of different diameters, upper and lower relative to the horizontal axis of the main pipeline and the establishment of these pipes at a distance that determines the optimal times EASURES coarse and fine screening sectors of the working surface of the screen is not known, which proves compliance of the claimed device the criterion of "inventive step".

 The implementation of the loading nozzles of various diameters: the upper and lower with respect to the horizontal axis of the main pipeline determines the picture of the separation of small and large screening on the working surface of the screen, and connecting the loading pipes at a distance L from each other, which determines the optimal sizes of sectors of large and small screening with different passage holes, allow to increase the yield of minerals in the under-sieve product.

 In October 1992, at the Solovyevsky mine in the village of Solovyevsk, Amur Region, an industrial design of the sand pre-enrichment apparatus was manufactured and tested.

 The enrichment efficiency of epelic sand was 94-96% for the minus product, which proves the conformity of the claimed device to the criterion of "Industrial applicability".

 In FIG. 1 shows a general view of the apparatus; in FIG. 2 view A.

 The sand pre-enrichment apparatus comprises a cylindrical conical body 1, inside the conical part of which there are grates 2 forming a conical sowing surface 3.

 The loading nozzles 4 and 5 are connected to the cylindrical part of the housing tangentially to the direction of movement of the hydraulic mixture at a distance dependent on the particle size distribution of the rock.

где L расстояние между точками подвода патрубков;
Д_ц диаметр цилиндрической части грохота;
σ_гр размер граничного зерна фракционируемых пород; Пδ_гр - процентное содержание фракций с размерами частиц меньших размеров граничного зерна δ_гр.
Точки подвода загрузочных патрубков разделяют рабочую поверхность грохота на две зоны зону 8 крупного и зону 9 мелкого грохочения, при этом колосники зоны крупного грохочения имеют размеры проходных отверстий d₁, рассчитанные на прохождение частиц по граничному зерну δ_гр в двухфазной среде, содержащей крупные фракции, а колосники зоны мелкого грохочения имеют размеры проходных отверстий d₂, рассчитанные на прохождение частиц по граничному зерну δ_гр,, в двухфазной среде, содержащей мелкие фракции.

where L is the distance between the points of supply of the nozzles;
D _{c the} diameter of the cylindrical part of the screen;
σ _{gr the} size of the boundary grain fractionated rocks; P δ _gr - the percentage of fractions with particle sizes of smaller sizes of the boundary grain δ _gr .
The inlet points of the loading nozzles divide the working surface of the screen into two zones, zone 8, large and zone 9, small screening, while the grid-irons of the zone of large screening have passage openings d ₁ , designed for particles to pass along the boundary grain δ _gr in a two-phase medium containing large fractions, and the grid-irons of the small screening zone have through-hole sizes d ₂ calculated for the passage of particles along the boundary grain δ _gr , in a two-phase medium containing fine fractions.

 The hydraulic mixture is supplied to the working surface of the screen through a pipe 4 for supplying a large fraction and a pipe 5 for supplying a small fraction. The loading nozzles 4 and 5 are made of various diameters in the form of an upper and lower relative to the horizontal axis of the main pipeline 7 and are connected with it through a separation device 6 of the main pipeline 7.

Д_в.п.= Д_м Д_н.п., где Д_м, Д_н.п., Д_в.п.
соответственно диаметры магистрального трубопровода, нижнего и верхнего подводящих патрубков; Пδ_гр процентное содержание фракций с размерами частиц, меньших размеров граничного зерна δ_гр.
В качестве примера, иллюстрирующего различные варианты конструктивного исполнения аппарата, можно привести два варианта: имеется два различных месторождений А и Б. Пески месторождения А имеют гранулометрический состав, при котором 30% горной массы крупностью меньше размера граничного зерна -δ_гр, а 70% крупностью больше δ_гр; и наоборот, для месторождения Б мелкая фракция составляет 70% а крупная 30%
В зависимости от такого распределения крупности песков конструкция аппарата, имеющего размер Д_ц 3000 мм и Д_м 530 мм для месторождения А будет иметь следующие параметры:

Д_н.п.= 530 370= 160 мм;
и соответственно для месторождения Б.The diameters of the loading nozzles 4 and 5 are determined by the formulas:

D _vp = D _m D _n.p. where D _m , D _n.p. , D _vp
respectively, the diameters of the main pipeline, the lower and upper supply pipes; P δ _{gr the} percentage of fractions with particle sizes smaller than the size of the boundary grain δ _gr .
As an example, illustrating various options for the structural design of the apparatus, two options can be cited: there are two different deposits A and B. The sands of field A have a particle size distribution in which 30% of the rock mass is smaller than the boundary grain size -δ _g , and 70% fineness more than δ _gr ; and vice versa, for field B, the fine fraction is 70% and the coarse 30%
Depending on this distribution of the size of the sand, the design of the apparatus having a size of D _c 3000 mm and D _m 530 mm for field A will have the following parameters:

D _n.p. = 530,370 = 160 mm;
and, accordingly, for deposit B.

Д_н.п.= 530 160 370 мм
Таким образом, в первом случае (месторождение А) площадь рабочей поверхности аппарата, предназначенной для мелкого грохочения, составляет 70% от площади рабочей поверхности и соответственно 30% для месторождения Б.

D _n.p. = 530 160 370 mm
Thus, in the first case (field A), the area of the working surface of the apparatus intended for small screening is 70% of the area of the working surface and, accordingly, 30% for field B.

 The device operates as follows.

The initial slurry through the main pipeline 7 is fed to the separation device 6, after passing through which the flow is divided into two parts: the upper and lower with respect to the horizontal axis of the pipeline. According to the loading nozzles 4, 5, the hydraulic mixture is supplied to the conical sowing surface 3. The screening process on the conical sowing surface occurs as follows. The largest fractions are fed through the loading nozzle 4, which fall onto the working zone 8, which have grates with optimal passage sizes for passage of fractions along the boundary grain - δ _gr , under conditions of unloading a two-phase flow with large inclusions, while a hydraulic mixture is fed through the loading nozzle 5 containing fine fractions, which enters the working area 9, with grid-irons having passage openings sizes optimal for passing fractions under conditions of unloading a two-phase flow with small incl teachings. The unloading of enrichment products is carried out through pipes 10, 11 located in the lower part of the housing 1.

 The design of the proposed apparatus for preliminary enrichment of sands allows you to create optimal conditions for increasing the yield of minerals in the under-sieve product, that is, to increase the efficiency of preliminary enrichment of sands.

Claims (1)

The sand pre-enrichment apparatus, comprising a cylindrical-conical body with a conical screening surface, a main supply slurry pipe with two loading nozzles, the longitudinal axes of the outlet openings which are tangent to the cylindrical part of the housing, discharge nozzles, characterized in that the loading nozzles are made of various diameters in the form of an upper and lower relative to the horizontal axis of the main supply slurry pipe located outside the cylinder-conical pus, and the conical screening surface is divided in the direction of the pulp stream into a shallow sector and a large screening sector with different sizes of screening holes, while the small screening sector is located in the direction of the pulp stream exiting the upper loading pipe, and the large screening sector is located in the direction of the pulp stream emerging from the lower loading nozzle, the diameters of the loading nozzles are determined from the ratios:

and D _VP D _m D _np ,
where D _{m the} diameter of the main supply pulp conduit, mm;
D _NP diameter of the lower loading pipe, mm;
D _VP diameter of the upper loading pipe, mm; P δ _gr - the percentage of fractions with particle sizes smaller than the boundary grain size δ _g , and the distance between the inputs of the loading nozzles into the cylindrical part of the housing along the length of its circumference is determined from the ratio:

,
where L is the distance between the inlets of the loading nozzles into the cylindrical part of the housing along its circumference, mm;
D _{c the} diameter of the cylindrical part of the body, mm

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