CN1013030B - Air current boundary layer method for pneumatic gulch-gold separation and pneumatic separation machine - Google Patents
Air current boundary layer method for pneumatic gulch-gold separation and pneumatic separation machineInfo
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- CN1013030B CN1013030B CN 89106758 CN89106758A CN1013030B CN 1013030 B CN1013030 B CN 1013030B CN 89106758 CN89106758 CN 89106758 CN 89106758 A CN89106758 A CN 89106758A CN 1013030 B CN1013030 B CN 1013030B
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- travelling belt
- pneumatic
- belt
- wind
- separation
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Abstract
The present invention relates to an air current boundary layer method for pneumatic gulch-gold separation and a pneumatic separation machine, which belong to the technical field of mineral concentration. In order to overcome the disadvantages of the prior art, cause a technological process and the structure of an appliance to become simple, reduce the productive rate of a concentrate and enhance recovery rate, the air current boundary layer method for pneumatic gulch-gold separation firstly spreads selected mineral gulch on a flat conveyer belt in one layer and then carries out air jet separation by utilizing the principle of an air current boundary layer. The pneumatic separation machine is composed of a belt conveyer, a blower fan, an air nozzle, a cloth bucket, etc., the process and the structure of the appliance are very simple, and selected size range is wide. The main technical economical index of the pneumatic separation machine is higher than the technical economical indexes of the existing pneumatic table, the existing jig, the existing chute and the existing horizontal air current separation machine, and the pneumatic separation machine is suitable for the gulch-gold mines of dry regions.
Description
The present invention relates to beneficiation method and equipment thereof, be specially adapted to the selection by winnowing of gravel mine or other heavy mineral in severe drought area.
Existing selection by winnowing technology and equipment thereof are mainly your (Dunbar) flour mill of air table, air jigging, wind-force chute, the distinguished and admirable separator of level and DOPA etc.The loose principle of stratification in air table, air jigging and the wind-force chute imitation hydraulic beneficiation replaces water as the ore dressing medium with air, the raw material bed is loose with ascending air, suspension, thus make the mineral gravity segregation.Because the density of air only is the one thousandth of water, the ratio of equilibrium settling velocity of particle sedimentation in air that proportion is different is than much smaller in water, and be difficult to form the intensive bed of high concentration in air-flow, so the sharpness of separation of air table, jigging, chute is more very different than waterpower shaking table, jigging, chute.
The fan valley wind car in rural area, the distinguished and admirable separator of level similar China south, raw material is scattered by the top and carry out sorting in horizontal gas flow under suspended state.The shortcoming of this method is, the granule in the heavy mineral drops on same place with bulky grain in the lighter tailings, and particle issues falls in the grade that promptly occurs in the gravity separation.Come the sorting gold dust then to also have a problem in this way: when the shape of gold in the gravel mine is mainly tabular and during sheet, the gold plaque plane in face of wind direction with down the wind the time, the thrust of the wind that is subjected to differs greatly, thereby, do not reach desirable separating effect, it is low that this method sorts precision, the concentrate yield height, and grade is low.
Owing to there are these problems, above-mentioned several method and equipment all adopt narrow grade selected, and in the hope of improving concentrate grade, this has just increased the workload of broken and screening, thereby makes the flow process complexity, and equipment is many, and energy consumption is big, and the cost height is difficult to apply industrial.
Your flour mill of DOPA is the new equipment with ore grinding and sorting heavy metallic mineral function of external development recent years, but tailings need be milled to-100 orders or-600 orders can be discharged, and the equipment heaviness, and wearing and tearing are severe, and energy consumption is big, the cost height.
The dry separation craft and the equipment thereof of the domestic northwest gravel mine that is tested and appraised recently are to adopt above-mentioned air table and the distinguished and admirable separator of level to form the example of flow process.This flow process needs raw ore is sieved into the milling ore of 0.3-1mm and two groups of grades of 1-2mm, for reaching certain concentrate grade, also must be through repeatedly sorting, and wherein the ore of 0.3-1mm grade need respectively sort for 4 times through distinguished and admirable separator and air table; The ore of 1-2mm grade need carry out the selective crushing screening, and then 3 sortings of the distinguished and admirable separator of process.Through after the above repeatedly sorting, products obtained therefrom is concentrate and chats.When the grade of raw ore gold is 0.562g/T, can obtain the rough concentrate that grade is 330.3g/T (expanding test is 441.7g/T), the rate of recovery and the concentrate yield of raw ore is respectively 88.75% and 0.1508%.
In view of the above problems, the objective of the invention is to that selection by winnowing for gold dust provides a kind of concentrate grade and recovery rate in ore-dressing is higher, flow process and the simpler method and apparatus of structure.
According to hydromechanical principle, when air communication is crossed the surface of solids, can form a very thin boundary layer, the characteristics of Velocity Profiles are in the boundary layer: near the speed minimum at surface of solids place, almost nil, along with leaving the surface of solids, return to speed of incoming flow rapidly.
Main points of the present invention are, in air-flow, carry out the drawback of sorting under the suspended state at ore in sand form above-mentioned, utilize in said flow boundary layer principle and the gravel mine rusty gold mostly to be tabular and these characteristics of sheet, make before selected ore in sand form enters air-spray, earlier it is being spread in solid for example on the surface of travelling belt.It is on the travelling belt surface that gold tabular at this moment and sheet is flat on solid naturally, and it is irregular spherical that the tailings that need abandon then mostly is, and it will be on the random position naturally.Along with the continuation operation of travelling belt, these ores in sand form enter air-spray.Air-spray is blown away to opposite side along the surface of belt from the long limit of travelling belt one side, and the long limit of direction and travelling belt intersects an angle of 90 degrees, and surperficial substantially parallel with travelling belt, and the constituency is divided in distinguished and admirable boundary layer of formation on the surface of travelling belt.After ore in sand form enters this minute constituency, since gold plaque on travelling belt highly be far smaller than height of sand grains, the front face area of gold plaque is significantly smaller than the front face area of sand grains, thereby according to the characteristics of flow boundary layer air wind speed profile, the thrust of the wind that gold plaque is subjected in air-spray is little more than sand grains, add that belt mostly is sliding friction to the friction of gold plaque, sand grains then mostly is rolling friction, the proportion of gold plaque is about 7 times of sand grains proportion again, so under the effect of air-spray, sand grains in the selected gravel mine is easy to be blown away, and gold is stayed on the travelling belt, discharges from the end of travelling belt.For granular gold, because its weight is greater than the sand of same physical dimension, so belt imposes on the frictional resistance of its frictional resistance greater than sand, and the surperficial smoother of granular gold, sand is then opposite, so be blown away and goldc grains is still stayed on the belt and is recovered at the air-spray medium sand.
Use this method, the selected ore in sand form that requires to be spread on the travelling belt is an individual layer, and this condition mainly relies on adjusting cloth bucket mine-supplying quantity and belt conveyer speed to reach.
For implementing the distinguished and admirable Boundary Layer Method of above-mentioned this gold dust selection by winnowing, the present invention also provides a kind of winnowing machine that adapts with it.Be illustrated below in conjunction with accompanying drawing:
Fig. 1 is the winnowing machine plane;
The cutaway view of Fig. 2 for being got along the A-A hatching of Fig. 1;
The cutaway view of Fig. 3 for being got along the B-B hatching of Fig. 1.
Winnowing machine provided by the invention is made up of following several parts: belt conveyer (1), be positioned at the cloth bucket (2) of this belt conveyer head end top, wind in the long limit of belt conveyer one side is chewed (3), connect the airduct (4) that this wind is chewed, the blower fan (5) that connects with this airduct, be located at the concentrate collection bucket (6) of belt conveyer end below, be in the opposite side on the long limit of belt conveyer and the tailings collection bucket (7) relative with the Feng Zui position.This winnowing machine is with the difference of the distinguished and admirable separator of existing level, selected ore in sand form is not to spread down from the distinguished and admirable top of level, ore grain carries out sorting under suspended state, but with ore in sand form before the level of entering is distinguished and admirable, scatter earlier on travelling belt (9), this level is distinguished and admirable to sort along with the continuation of travelling belt operation just enters then.Therefore, close position between cloth bucket of this winnowing machine and wind are chewed, traffic direction (8) with travelling belt is an order, cloth bucket is preceding, wind chew after, distance had between the two dropped on the travelling belt before chewing by wind and relative static degree of being with belt can make the ore in sand form under spreading from cloth bucket.The lower edge that wind is chewed outlet is positioned at the top at travelling belt edge, to the height (h) of spreading between the ore in sand form on the travelling belt be 1-5mm.It is that the long limit of airflow direction and travelling belt intersects an angle of 90 degrees that wind is chewed Way out, and surperficial substantially parallel with travelling belt.
For making the respond well of selection by winnowing, the surface of travelling belt should be flat pattern.
The present invention compares with the above-mentioned technological process of forming with the distinguished and admirable separator of air table and level (hereinafter to be referred as Comparative Examples), has following tangible advantage and good effect:
1, technological process and device structure are simple;
2, feed particle size wide ranges can directly be handled the ore in sand form of 0.3-2mm, and do not need to sieve into 0.1-1mm and two grades of 1-2mm as Comparative Examples;
3, concentrate grade height can reach 1107g/T, and Comparative Examples only is 441.7g/T;
4, recovery rate in ore-dressing height can reach 90.44%, and Comparative Examples is 88.75%;
5, concentrate yield is low, can reach 0.0425%, and Comparative Examples is 0.1508%.
Embodiment:
The test sample ore is taken from certain gravel mine of the Northwest, and this ore deposit is the gravel layer that proluvial forms, and head grade is 0.52g/T, and dried ore deposit is loose shape, and is non-caked.Raw ore proportion 2.7, apparent specific gravity (gd) 1.6, wherein gold exists with the rusty gold form, mostly is tabular and sheet.Screening shows that the golden overwhelming majority concentrates in the grade scope of 0.3-2mm, and the occupation rate of this grade gold and raw ore weight occupation rate are respectively 98.3% and 13.9%.
The grade scope of selected sample ore is 0.3-2mm, weighs 350 kilograms,
The device processes ability is 126 kilograms/hour,
The jet exit velocity that wind is chewed is the 7.4-8.2 meter per second,
The linear velocity of travelling belt is 0.75 meter per second.
Operating process is as follows:
Start blower fan (5) earlier, making air communication cross airduct (4) delivers to wind and chews (3) and penetrate, start belt conveyer (1) and cloth bucket (2) then, the cloth bucket of at last selected ore in sand form being packed into, cloth bucket with the ore in sand form individual layer be spread on the travelling belt, travelling belt is delivered to the place ahead of chewing the air-spray that (3) penetrates from wind with ore in sand form, tailings is blown into tailings collection bucket (7), Jin Ze stays above the belt, is transported in the concentrate collection bucket (6) to discharge.
Sample ore is through a sorting of winnowing machine of the present invention, and its result is as follows:
1.107 kilograms/ton of concentrate grades,
Operation recovery 92.01%, to the rate of recovery 90.44% of raw ore,
Operation concentrate yield 0.3058%, to the concentrate yield 0.0425% of raw ore,
9 kilowatt-hours of one ton of selected ore in sand form power consumptions of every processing.
Claims (4)
1, a kind of distinguished and admirable boundary layer method of gold dust selection by winnowing, the dry type selection by winnowing that is used for gold dust or other heavy mineral, make the ore dressing medium with air, the goldc grains that the sand grains that proportion is less and proportion are bigger separates, it is characterized in that, selected ore in sand form was spread on the travelling belt earlier before entering air-spray, along with the operation of travelling belt enters air-spray again, air-spray is blown away to opposite side along the surface of belt from the long limit of travelling belt one side, the long limit of direction and travelling belt intersects an angle of 90 degrees, and surperficial substantially parallel with travelling belt.
2, the method for claim 1, the ore in sand form that it is characterized in that being spread on the travelling belt is an individual layer.
3, a kind of winnowing machine of implementing the described method of claim 1, comprise belt conveyer (1), be positioned at the cloth bucket (2) of this belt conveyer head end top, wind in the long limit of belt conveyer one side is chewed (3), connect the airduct (4) that this wind is chewed, the blower fan (5) that connects with this airduct, be located at the concentrate collection bucket (6) of belt conveyer end below, be in the opposite side on the long limit of belt conveyer and the relative tailings collection bucket of chewing with wind (7) in position, it is characterized in that, positional alignment between cloth bucket and wind are chewed is closed, traffic direction (8) with travelling belt (9) is a preface, cloth bucket is preceding, wind chew after, the lower edge that wind is chewed outlet is positioned at the top at travelling belt edge, to the height (h) of spreading between the ore in sand form on the travelling belt be 1-5mm, the long limit that wind is chewed Way out and travelling belt intersects an angle of 90 degrees, and surperficial substantially parallel with travelling belt.
4, winnowing machine as claimed in claim 3 is characterized in that travelling belt (9) is a flat pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106758 CN1013030B (en) | 1989-08-22 | 1989-08-22 | Air current boundary layer method for pneumatic gulch-gold separation and pneumatic separation machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106758 CN1013030B (en) | 1989-08-22 | 1989-08-22 | Air current boundary layer method for pneumatic gulch-gold separation and pneumatic separation machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1045537A CN1045537A (en) | 1990-09-26 |
| CN1013030B true CN1013030B (en) | 1991-07-03 |
Family
ID=4856849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89106758 Expired CN1013030B (en) | 1989-08-22 | 1989-08-22 | Air current boundary layer method for pneumatic gulch-gold separation and pneumatic separation machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013030B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1106222C (en) * | 1995-09-18 | 2003-04-23 | 森斯迪菲布雷托洛维沙有限公司 | Procedure and apparatus for separating heavy particle of material from lighter ones |
-
1989
- 1989-08-22 CN CN 89106758 patent/CN1013030B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1106222C (en) * | 1995-09-18 | 2003-04-23 | 森斯迪菲布雷托洛维沙有限公司 | Procedure and apparatus for separating heavy particle of material from lighter ones |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1045537A (en) | 1990-09-26 |
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