CN107096646B - Method and device for flotation of coarse particle flotation column - Google Patents
Method and device for flotation of coarse particle flotation column Download PDFInfo
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Abstract
The invention discloses a method and a device for floating a coarse particle flotation column, wherein when the coarse particle flotation column works, ore pulp is fed into the column from an ore feeding pipe at an inlet of the column body and slowly descends along the whole section of the column body, compressed air with certain pressure is filled into the column through an air filling device at the lower part of the column body, a large number of micro bubbles slowly ascend along the whole section of the column body, the ore pulp and the bubbles form convection motion, ore particles are fully contacted with the bubbles, circulating pipelines are symmetrically arranged at two sides of the column body and are communicated with the air filling device at the bottom, and by opening one or more sections of circulating pipeline valves, floatable coarse particles attached to the bubbles are conveyed to a certain height by the pressure generated by a circulating pump under the assistance of buoyancy of the bubbles, and then the bubbles float to the surface of the ore pulp to form a foam layer and automatically overflow as ore concentrate. The non-floating gangue minerals fall into the lower part of the cylinder, are collected by the cone part and are discharged from the tailing pipe.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a method and a device for flotation of a coarse particle flotation column.
Background
With the increasing proportion of refractory ores with low grade, fine embedded granularity and complex mineral composition in the field of mineral processing, the limitations of the traditional flotation machine are increased greatly, such as high energy consumption, serious abrasion, inconvenient configuration, large maintenance amount and the like. Compared with a flotation machine, the flotation column has the advantages of high beneficiation efficiency, low investment cost and production cost, small occupied area, low installation cost, small medicament consumption, suitability for micro-fine particle separation, easiness in automatic control and the like. Under the conditions that the ore is difficult to separate and the world faces energy crisis, the efficient and energy-saving flotation column is especially important to develop.
However, flotation columns also have certain limitations: (1) coarse particles are difficult to suspend, the contact probability of bubbles and particles is small, the recovery rate is lost for improving the grade, the method is mainly limited to concentration operation, and the use effect in the concentration operation is not ideal; (2) the chemical property of the ore pulp has great influence on the flotation effect, and the ore pulp with high viscosity can cause extremely poor tailing foam, so that fine-grained gangue can easily stay in the ore pulp for a long time, and the flotation process is deteriorated; (3) the concentrate grade is improved by adding washing water, and an inflation pipeline is easy to block. Therefore, the common flotation columns are not highly adaptable to ores.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method and the device for floating the coarse particle flotation column not only transfer the advantages of a common flotation column, but also solve a series of problems of difficult floating of coarse particles, easy blockage of pipelines, deteriorated flow, increased washing water amount and the like so as to overcome the defects of the prior art.
The invention is realized by the following steps:
a method for floating coarse particles in floatation column features that under the condition of dissociation of useful minerals and gangue minerals, the ore pulp is fed into the column from ore feeding tube at inlet of column and slowly dropped along the whole cross section of column, the compressed air with a certain pressure is pumped into the column via the microbubble generator under the column, and a lot of micro bubbles rise slowly along the whole cross section of column to form convective movement between ore pulp and bubbles. The non-floating gangue minerals fall into the lower part of the column body, are collected by the cone part and are discharged from the tailing pipe.
In the flotation method of the coarse particle flotation column, the circulating pipelines are connected and communicated with each other, 4-10 sections of circulating pipelines are connected in parallel and symmetrically distributed on two sides of the column body, and the circulating pipeline at the bottom is communicated with the aerating device through the circulating pump.
The utility model provides a device of coarse grain flotation column flotation, the cylinder of including coarse grain flotation column, fix on supporting platform at the cylinder, set up tailing ore discharge mouth and this tailing ore discharge mouth is located supporting platform at the cylinder afterbody, gas piping's inlet end symmetry sets up edgewise on tailing ore discharge mouth and makes gas piping and cylinder intercommunication, 4-10 sections circulating line connect in parallel each other and are symmetric distribution in the cylinder both sides, and the circulating line who is located the bottom passes through the circulating pump and communicates with the gas pipe, set up the feed pipe on one side of cylinder upper portion, the froth groove that one side set up the froth ore discharge mouth is located directly over the cylinder and this froth groove covers cylinder top port, set up flushing system directly over the froth groove.
In a device for flotation of a coarse particle flotation column, a filter tank is arranged in the column between the feed pipe and the circulation pipe.
In the aforesaid device of coarse grain flotation column flotation, the cylinder of coarse grain flotation column sets up 2 at least and position parallel each other, and the feed pipe intercommunication on foam ore discharge mouth and the next cylinder on the last cylinder, the cylinder of first coarse grain flotation column and the processing system connection of raw materials ore deposit, the processing system of this raw materials ore deposit includes peristaltic pump, churn, pulp pump, spiral classifier, ball mill and gives the ore deposit machine, and each part adopts the series connection mode to connect gradually in the processing system of above-mentioned raw materials ore deposit.
In the device for floating the coarse particle flotation column, the inflation pipeline of each column body is respectively communicated with the air storage tank in a parallel connection mode, the air compressor is arranged at the air storage tank, and the air flow meter is arranged between the corresponding inflation pipeline and the air storage tank.
In the device for flotation of the coarse particle flotation column, the electric valve is arranged in the corresponding circulating pipeline.
Due to the adoption of the technical scheme, compared with the prior art, the flotation column provided by the invention has the advantages that the two sides of the flotation column are provided with the plurality of symmetrically distributed parallel circulating pipelines, each pipeline is controlled by a valve, the flotation column can be freely adjusted to match with the flotation of minerals with different particle sizes, and the flotation column is convenient to adjust and is multipurpose. The coarse particle flotation column has the following properties:
(1) The flotation column is improved on the basis of the traditional flotation column, so that a series of advantages of the traditional flotation column are inherited;
(2) A proper circulation path is controlled, and the phenomenon that coarse particles fall off due to long conveying path can be avoided by using the suction force of a circulating pump, so that the adaptability of the flotation column to the material size fraction is increased, and the upper limit of the flotation particle size of the treated material is expanded;
(3) The design of the multi-section valve circulating pipeline can be freely adjusted through the valves to match the flotation of minerals with different particle sizes, is convenient to adjust, is suitable for the flotation of minerals with different particle size ranges and different ore types, and has the advantage of multiple purposes;
(4) The symmetrical step-shaped circulating pipelines can enable ore pulp to form convection contact with bubbles, so that the mineralization time is prolonged, and the probability of collision between the bubbles and particles is increased; and meanwhile, the valve is opened, so that the ore pulp can be layered according to the grade, and the entrainment of fine ore particles is avoided.
(5) Cleaning ports are reserved at the tail end of the circulating pipeline and the bottom of the column body, so that the pipeline can be conveniently cleaned;
(6) The ore feeding pipe and the ore discharging pipe of the flotation column are both arranged in a 30-degree inclined form, so that the phenomenon of pipeline blockage can be improved.
(7) In the field of mineral separation, a coarse particle flotation column can be widely applied to coarse particle sorting operation, and can be used for coarse particle sorting of ores such as coal mines, phosphorite and bauxite, machine column combined flotation, flotation pulp foam control, flotation reagent experiments and the like.
(8) The circulating system of the flotation column utilizes the pressure of a circulating pump to pump coarse particles attached to bubbles to a certain height, and then utilizes the bubbles to carry the floating coarse particles to float to a foam collecting area to realize flotation. Therefore, the principle of the equipment is established on the basis of science, and the equipment mainly solves the problem of coarse particle flotation.
(9) The coarse particle flotation column equipment is novel in design, ingenious in conception, advanced in structure compared with domestic similar equipment and high in universality. The main innovation points are as follows: the circulating system of the flotation column is designed in a symmetrical mode and is controlled by only one circulating pump. The circulating pump can freely adjust the frequency, so as to control the circulating speed of the circulating pump, and the operation is more convenient; the device has stronger applicability, and the cycle height can be selected according to the properties of materials.
(10) The experimental equipment is easy to operate, stable in performance, good in universality, safe, reliable, low in price and convenient to popularize;
the equipment can meet various flotation processes including direct flotation, reverse flotation, direct and reverse flotation, reverse and direct flotation and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of an application of the present invention;
fig. 3 is a schematic diagram of the practical effect of the invention. .
The specific implementation mode is as follows:
the embodiment of the invention comprises the following steps: a method for column flotation of coarse particles, characterized in that: when the coarse particle flotation column works, ore pulp is fed into the column from an ore feeding pipe at an inlet of the column and slowly descends along the whole section of the column, compressed air with certain pressure is filled into the column through an air filling device positioned at the lower part of the column, a large number of micro bubbles slowly ascend along the whole section of the column, the ore pulp and the bubbles form convection motion, ore particles are fully contacted with the bubbles, circulating pipelines are symmetrically arranged at two sides of the column and are communicated with the air filling device at the bottom, one section or a plurality of sections of circulating pipeline valves are opened, under the assistance of bubble buoyancy, floatable coarse particles attached to the bubbles are conveyed to a certain height by the pressure generated by a circulating pump, and then the floatable coarse particles are driven by the bubbles to the surface of the ore pulp to form a foam layer to be automatically overflowed as concentrate. The non-floating gangue minerals fall into the lower part of the column body, are collected by the cone part and are discharged from the tailing pipe.
The circulating pipelines are mutually related, connected and communicated, 4-10 sections of the circulating pipelines are mutually connected in parallel and symmetrically distributed on two sides of the column body, and the circulating pipeline positioned at the bottom is communicated with the air charging device through a circulating pump.
According to the device for flotation of the coarse particle flotation column formed by the method, as shown in the attached drawing, a column body 8 comprising the coarse particle flotation column is fixed on a support platform 12, a tailing discharge port 11 is arranged at the tail part of the column body 8, the tailing discharge port 11 is positioned in the support platform 12, the air inlet ends of air inflation pipelines 10 are symmetrically arranged on the edge of the tailing discharge port 11, the air inflation pipelines 10 are communicated with the column body 8, 4-10 sections of circulation pipelines 5 are connected in parallel and symmetrically distributed on two sides of the column body 8, the circulation pipeline 5 positioned at the bottom is communicated with the air inflation pipeline 10 through a circulation pump 6, a feeding pipe 3 is arranged on one side of the upper part of the column body 8, a foam tank 12 provided with a foam discharge port 7 on one side is positioned right above the column body 8, the foam tank 12 covers the top port of the column body 8, and a flushing system 1 is arranged right above the foam tank 2.
Wherein set up the filter tank 13 in the cylinder 8 between feed pipe 3 and circulating line 5, the cylinder 8 of this coarse particle flotation column sets up 2 at least and position parallel each other, foam ore discharge mouth 7 on the last cylinder 8 communicates with feed pipe 3 on the next cylinder 8, the cylinder 8 of the first coarse particle flotation column is connected with the processing system of raw materials ore deposit, the processing system of this raw materials deposit includes peristaltic pump 14, churn 15, pulp pump 16, spiral classifier 17, ball mill 21 and feeder 18, each part adopts the series connection mode to connect gradually in the processing system of above-mentioned raw materials deposit, the gas charging line 10 of each cylinder adopts the parallel connection mode to communicate with air reservoir 19 respectively, set up air compressor machine 22 in air reservoir 19 department, air flowmeter 20 sets up between corresponding gas charging line 10 and air reservoir 19, set up electric valve 4 in the above-mentioned circulating line 5 that corresponds.
The embodiment belongs to the mineral particle sorting range and comprises a column body, a foam tank, an ore feeding pipe, an ore discharging pipe, a circulating system (comprising a circulating pipeline and a circulating pump), an inflating system (comprising an air inlet pipe and an air compressor) and a flushing system. Compared with the traditional flotation column, the biggest innovation point of the coarse particle flotation column is that the circulating system part is composed of 8 sections of circulating pipelines and a circulating pump, wherein the 8 sections of circulating pipelines are symmetrically distributed on two sides of the column body and are connected in parallel, each section of circulating pipeline is provided with an electric valve, and the electric valves can be freely switched to adjust the circulating path of ore pulp so as to adapt to the selection of minerals with different particle sizes.
When the flotation column is used for separating minerals which are dissociated in monomers but have relatively coarse granularity (about 75% of 150 meshes), the coarse-particle minerals can be conveyed to a certain height under the action of circulating pressure through a valve of a free adjustment circulating system, and then the coarse particles float to a foam collecting area by utilizing bubble floating, so that the flotation of the coarse particles is realized. The flotation column utilizes the circulating system, shortens the path of the coarse particles floating freely, enlarges the upper limit of the flotation granularity, improves the recovery of the coarse particle minerals on the premise of ensuring the sorting effect of the micro-fine particle minerals, and solves the difficult problems that the traditional flotation column can only float the micro-fine particle minerals and has poor adaptability to ores. The operation cost of the whole plant is reduced from two aspects of ore grinding operation and flotation operation.
In the traditional flotation operation, each section of flotation operation such as roughing, concentration, scavenging and the like, the circulation mode of a flotation column is fixed, the mode is not beneficial to improving the recovery rate, the particles are thinner in the concentration section, the particles are thicker in the scavenging section, the particles circulate in the same mode, the granularity of the mineral particles is greatly different, the recovery rate of coarse particle minerals is reduced, the flotation column can control the circulation height of each section of flotation flow, the circulation height control ratio is lower in the roughing and concentrating sections due to the thinner particle size, the circulation height needs to be improved in the scavenging section, and the coarse particles are brought to the top of the column in a forced circulation mode, so that the purpose of coarse particle separation is achieved.
When the coarse particle flotation column works, ore pulp is fed into the column from an ore feeding pipe at the 2/3 position of the column body and slowly descends along the whole section of the column body. Meanwhile, compressed air with certain pressure is inflated into the column through an inflating device positioned at the lower part of the column body, and a large number of micro bubbles gradually rise along the whole section of the column body. The ore pulp and the air bubbles form convection motion, and the ore particles are fully contacted with the air bubbles. And opening a certain section or a plurality of sections of circulating pipeline valves, conveying the floatable coarse particles attached to the bubbles to a certain height by using the pressure generated by the circulating pump under the assistance of the buoyancy of the bubbles, and then carrying the floatable coarse particles to float to the surface of the ore pulp by the bubbles to form a foam layer which is used as the concentrate to automatically overflow. The non-floating gangue minerals fall into the lower part of the column body, are collected by the cone part and are discharged from the tailing pipe.
As shown in the figure, the coarse particle flotation column is characterized in that the ore feeding pipe is positioned at the middle upper part of the column body and is provided with two ore discharging ports, wherein the ore discharging port 1 is used for discharging non-foam products, and the ore discharging port 2 is generally used for cleaning the column body; two sides of the flotation column are provided with 8 circulation pipelines which are symmetrically distributed and connected in parallel, each section of pipeline is controlled by a valve, and the flotation column can be freely adjusted to match the flotation of minerals with different particle sizes, and has the advantages of convenient adjustment and multiple purposes. The coarse particle flotation column has the following properties:
(1) The flotation column is improved on the basis of the traditional flotation column, so that a series of advantages of the traditional flotation column are inherited;
(2) A proper circulation path is controlled, and the phenomenon that coarse particles fall off due to long conveying path can be avoided by using the suction force of a circulating pump, so that the adaptability of the flotation column to the material size fraction is increased, and the upper limit of the flotation particle size of the treated material is expanded;
(3) The design of the multi-section circulating pipeline with the valve can be freely adjusted through the valve to match the flotation of minerals with different particle sizes, is convenient to adjust, is suitable for the flotation of minerals with different particle size ranges and different ore types, and has the advantage of multiple purposes;
(4) The symmetrical step-shaped circulating pipelines can enable ore pulp to form convection contact with bubbles, so that the mineralization time is prolonged, and the probability of collision between the bubbles and particles is increased; meanwhile, the valve is opened, so that the ore pulp can be layered according to the size fraction, and the entrainment of fine ore particles is avoided.
(5) Cleaning ports are reserved at the tail end of the circulating pipeline and the bottom of the column body, so that the pipeline can be conveniently cleaned;
(6) The ore feeding pipe and the ore discharging pipe of the flotation column are both arranged in a 30-degree inclined form, so that the phenomenon of pipeline blockage can be improved.
(7) The coarse particle flotation column can be widely applied to coarse particle sorting operation, and can be used for coarse particle sorting of ores such as coal mines, phosphorite and bauxite, machine column combined flotation, flotation pulp foam control, flotation reagent experiments and the like.
(8) The traditional flotation column which is difficult to use in the coarse particle flotation column is improved on the basis of the traditional flotation column, the basic principle of the traditional flotation column is the same as that of the traditional flotation column, and the only difference is the circulating system part. The circulating system is used for conveying coarse particles attached to bubbles to a certain height under pressure by utilizing the pressure of a circulating pump, and then floating the coarse particles to a foam collecting area by utilizing the floating of the bubbles to realize flotation. Therefore, the principle of the equipment is established on the basis of science, and the equipment mainly solves the problem of coarse particle flotation.
(9) The coarse particle flotation column equipment is novel in design, ingenious in conception, advanced in structure compared with domestic similar equipment and high in universality. The main innovation points are as follows: the circulating system of the flotation column is designed in a symmetrical mode and is controlled by only one circulating pump. The circulating pump can freely adjust the frequency, so as to control the circulating speed of the circulating pump, and the operation is more convenient; the device has stronger applicability, and the cycle height can be selected according to the properties of materials.
The experimental equipment is easy to operate, stable in performance, good in universality, safe, reliable, low in price and convenient to popularize;
the equipment can meet various flotation processes including direct flotation, reverse flotation, direct and reverse flotation, reverse and direct flotation and the like.
This embodiment can also design PLC feedback control system (realize the higher purpose of degree of automation), the system during operation, detect the concentration of feed inlet ore pulp earlier, the flow, density, and the granularity constitution and the floatability of ore pulp, the grade and the granularity size of concentrate and tailing, thereby judge the degree of opening of every group electric valve, the aeration quantity of ore pulp bottom, and the rotational speed of circulating pump, the circulating pump is variable frequency speed regulating motor, can adjust circulation rate, it is little when coarse grain mineral uplift, the flotation rate of recovery is little, adjust big aeration quantity, adjust fast circulating pump motor, the coarse grain mineral receives the effect of lift and come-up.
Specific examples are as follows:
detailed description of the preferred embodiment 1
The test material was a bauxite. Multielement chemical analysis of raw ores, in which Al 2 O 3 62.3 percent of SiO 2 The mass fraction accounts for 11.54 percent. The aluminum-silicon ratio of the raw ore is 5.40, and the raw ore belongs to typical bauxite with medium and low aluminum-silicon ratio. Crushing the raw ore to-3 mm and mixing uniformly. 75% of the ground ore with the ground ore granularity of-0.074 mm, and the analysis result of the ground ore granularity is shown in Table 3.
TABLE 1 results of multiple chemical analysis (mass fraction)/%, of the samples
TABLE 2 mineral composition/% of test samples
TABLE 3 Ore grinding grain size composition
As can be seen from Table 2, when the ground ore particle size reaches 75% of-200 mesh size fraction, the-0.038 mm particle size fraction accounts for 27.48%, the argillization degree is low, and the ore distribution particle size is uniform, so that the ground ore fineness can be properly widened to 75% of-200 mesh for the flotation of the bauxite, and the bauxite is suitable for being separated by using a layered convection coarse particle flotation column. In the test, a layered convection coarse particle flotation column system with phi 100mm multiplied by 1000mm is used as separation equipment, and other equipment comprises a small sand pump with 0.5kW, a small laboratory circulating pump with 1kW and a WF-0.8/10 type air compressor.
The experiment aims at researching the optimal test parameters of the novel layered convection coarse particle flotation column and verifying the effect of the flotation column, so that the tested medicament and process flow are commonly used in the current factory. The collecting agent used in the test is saponified fatty acid collecting agent, the dispersing agent is sodium hexametaphosphate, and the pulp pH regulator is sodium carbonate. Adopts a process flow of 'primary coarse and fine'. The optimum process parameters and operating conditions were determined by orthogonal experiments.
Crushing 1000g of an ore sample to be-3 mm, grinding the ore until the ore is-200 meshes accounting for 75%, pouring the ore pulp into a pulp mixing barrel, controlling the concentration of the ore pulp to be about 30%, adding sodium carbonate to adjust the pH value of the ore pulp to be 9-10, stirring for 3min, adding sodium hexametaphosphate, stirring for 3min, adding a collecting agent, stirring for 4min, transferring the ore pulp into the stirring barrel to continue stirring after the pulp mixing is finished, and conveying the ore pulp into a flotation column by using a sand pump to finish roughing; and stirring the rough concentrate for 3min, and then carrying out concentration. Air is filled into the bottom of the column through an air compressor, forms countercurrent contact with the fed ore pulp and the leaching water, carries out layered classification and convective mineralization through a circulating pipeline, and enters a fine separation area under the combined action of circulating pressure and bubble buoyancy. Washing water is fed from above the flotation column, and the washing water is used to wash away the mineral particles which are not firmly adhered to the air bubbles. Concentrate is discharged from the top of the column and tailings are discharged from the bottom of the column. Filtering the obtained product, drying, sampling and testing. A schematic diagram of a layered convection coarse particle flotation column flotation plant is shown in figure 2.
Through tests, the flotation process parameters and operation conditions are determined that the ore pulp concentration is 30%, the pH value is controlled to be 9-10, the using amount of the collecting agent is 1000g/t, the using amount of the inhibitor sodium hexametaphosphate is 25g/t, and the aeration quantity is 0.3125m 3 The flow rate of the shower water is 0.0012m 3 H, the circulating pressure is 0.21MPa; selecting, stirring for 3min, and aerating at 0.30m 3 The flow rate of the shower water is 0.005m 3 The circulation pressure is 0.17MPa. The test was conducted in the laboratory.
TABLE 4 bauxite flotation index by laminar convection coarse particle flotation column flotation
As can be seen from Table 4, the first rough-first fine flotation process is adopted, and when the ratio of the selected aluminum to silicon is 5.40, good indexes that the ratio of the concentrate to aluminum to silicon is 11.05 and the recovery rate of the alumina is 87.88 percent are obtained. Greatly improves the aluminum-silicon ratio and the recovery rate of the concentrate. Test results prove that the structural form of the novel layered convection coarse particle flotation column is beneficial to separation of coarse particle minerals. The flotation column adopts a plurality of sections of circulating pipelines, freely controls a circulating path, fully mineralizes and stratifies ore pulp, is favorable for improving the collision probability of bubbles and particles, and improves the recovery rate of concentrate. The stratified convective coarse flotation column has unique advantages in coarse sorting.
Example 2:
in the test, 2kg of ground ore product is weighed in a stirring barrel, the concentration of the ore pulp is adjusted to be 24%, sulfuric acid is firstly added into the ore pulp with the adjusted concentration to serve as a pH regulator and an inhibitor, and the collecting agent GJBW is added after stirring for 2 min. And feeding the ore pulp into a flotation column through an ore pulp pump, wherein the flotation time is 10min, and bubbles are scraped every 5 min.
TABLE 5 novel flotation column test results
As can be seen from the grade curve of the graph, as the fineness of the grinding ore increases, P in the concentrate 2 O 5 The grade of the ore is in a slow increasing trend, and the concentrate grade is reduced after the fineness of the ground ore exceeds 88.53 percent. As can be seen from the recovery curve, as the fineness of the grinding increases, P in the concentrate 2 O 5 The recovery rate of (a) shows a tendency to increase first and then decrease. This is because when the fineness of grinding is between 67.13% and 72.59%, the minerals may not be completely dissociated by the monomers, and the recovery rate is low; when the grinding fineness is gradually increased, minerals are gradually and singly dissociated, but the yield of the concentrate is gradually reduced due to reverse flotation, and the grade change of the concentrate is not obvious, so that the recovery rate also tends to be gradually reduced; when the fineness of the ground ore reaches 90.15%, the recovery rate is obviously reduced, because the sliming phenomenon is easily caused due to the excessively fine granularity of the ground ore, the selectivity of the medicament is poor, and the recovery rate of the concentrate is reduced.
As can be seen from Table 5, P in the concentrate was found when the grinding fineness of-0.075 mm was 84.98% 2 O 5 The grade of the product is 32.05 percent, and the recovery rate of P2O5 is 93.22 percent; when the content of grinding fineness-0.075 mm accounts for 88.53%, the grade of P2O5 in the concentrate is 32.36%, and the recovery rate of P2O5 is 92.86%.
When the content of the common flotation column is 88.01 percent under the condition of grinding fineness of-0.075 mm, P in the concentrate 2 O 5 The grade is 32.07%, and the recovery rate of P2O5 in the concentrate is 92.79%. Compared with the common flotation column, when the grinding fineness of-0.075 mm accounts for 84.98%, the grade of the concentrate obtained by using the novel flotation column reaches the best index of the common flotation column, the grade of the concentrate is not greatly different from that of the common flotation column, and the recovery rate is improved by 0.43% compared with that of the common flotation column, so that the novel flotation column can recover a part of coarse-grained minerals which are difficult to float by using the common flotation column; when the content of grinding fineness-0.075 mm accounts for 88.53%, P in the concentrate 2 O 5 The grade of the concentrate is improved by 0.29 percent compared with that of the common flotation column, and P in the concentrate 2 O 5 The recovery rate is improved by 0.07 percent compared with the common flotation column.
From this it can be concluded that: the novel flotation column can freely control an ore pulp circulation path by using a valve according to the properties and the granularity composition of ore, so that not only can ore particles smaller than 0.075mm in ore pulp be floated, but also a part of ore particles larger than 0.075mm which are difficult to float by using a common flotation column can be recovered, and finally, the upper limit of the flotation granularity is expanded.
The foregoing embodiments are described in order that those skilled in the art will readily understand and use the invention and, accordingly, it is not intended to limit the invention to the exact forms disclosed, and all such modifications and variations that may be made without departing from the scope of the invention are deemed to be within the ambit of the invention by those skilled in the art to which the invention pertains.
Claims (6)
1. A method of flotation in a coarse particle flotation column, comprising: when the coarse particle flotation column works, ore pulp is fed into the column from an ore feeding pipe at the inlet of the column body and slowly descends along the whole section of the column body, compressed air with certain pressure is inflated into the column through an inflating device positioned at the lower part of the column body, a large number of micro bubbles slowly ascend along the whole section of the column body, the ore pulp and the bubbles form convection motion, ore particles are fully contacted with the bubbles, circulating pipelines are symmetrically arranged at two sides of the column body and are communicated with the inflating device at the bottom, a certain section or a plurality of sections of circulating pipeline valves are opened, under the assistance of bubble buoyancy, pressure generated by a circulating pump is used for conveying floatable coarse particles attached to the bubbles to a certain height, and then the floatable coarse particles are driven to the surface of the ore pulp by the bubbles to form a foam layer to be used as concentrate to automatically overflow; the non-floating gangue minerals fall into the lower part of the cylinder, are collected by the cone part and are discharged from the tailing pipe; the circulating pipelines are mutually related, connected and communicated, 4-10 sections of circulating pipelines are mutually connected in parallel and symmetrically distributed on two sides of the column body, the different sections of circulating pipelines are arranged at different height positions of the column body, and the circulating pipeline positioned at the bottom is communicated with the air charging device through the circulating pump.
2. A device for flotation of a coarse particle flotation column comprises a column body (8) of the coarse particle flotation column and is characterized in that the column body (8) is fixed on a support platform (12), a tailing ore discharge port (11) is formed in the tail of the column body (8) and located in the support platform (12), the air inlet ends of air inflation pipelines (10) are symmetrically arranged on the tailing ore discharge port (11) along the edge, the air inflation pipelines (10) are communicated with the column body (8), 4-10 sections of circulation pipelines (5) are connected in parallel and symmetrically distributed on two sides of the column body (8), different sections of circulation pipelines (5) are located at different height positions of the column body (8), the circulation pipelines (5) located at the bottom are communicated with the air inflation pipelines (10) through circulating pumps (6), a feeding pipe (3) is arranged on one side of the upper portion of the column body (8), a foam tank (2) with a foam ore discharge port (7) arranged on one side is located right above the column body (8), the top of the foam tank (2) covers the column body (8), and a port (1) is arranged above the foam tank.
3. The apparatus for flotation of a coarse particle flotation column as recited in claim 2, further comprising: a filter tank (13) is arranged in the column (8) between the feed pipe (3) and the circulation pipe (5).
4. The apparatus for flotation of a coarse particle flotation column as recited in claim 2, further comprising: the cylinder (8) of coarse particle flotation column set up 2 at least and the position is parallel each other, foam ore discharge mouth (7) on last cylinder (8) and feed pipe (3) on next cylinder (8) intercommunication, cylinder (8) of first coarse particle flotation column are connected with the system of processing of raw materials ore deposit, the system of processing of this raw materials ore deposit includes peristaltic pump (14), churn (15), ore pulp pump (16), spiral classifier (17), ball mill (21) and give ore deposit machine (18), each part adopts the series connection mode to connect gradually in the system of processing of above-mentioned raw materials ore deposit.
5. The apparatus for flotation of a coarse particle flotation column as recited in claim 4, wherein: the inflation pipeline (10) of each column body is respectively communicated with the air storage tank (19) in a parallel connection mode, an air compressor (22) is arranged at the air storage tank (19), and an air flow meter (20) is arranged between the corresponding inflation pipeline (10) and the air storage tank (19).
6. The apparatus for flotation of a column for coarse flotation as recited in claim 2, wherein: an electric valve (4) is arranged on the corresponding circulating pipeline (5).
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| CN110026332B (en) * | 2019-04-04 | 2024-03-19 | 浮得净(浙江)科技有限公司 | Intelligent flotation feeding online granularity control screen device |
| CN112474033B (en) * | 2020-11-05 | 2022-04-29 | 阜新工大矿物加工利用科技有限公司 | Coal slime pre-desliming and sorting process |
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