CN112517232B - Flotation method for low-grade collophanite with compact block structure - Google Patents
Flotation method for low-grade collophanite with compact block structure Download PDFInfo
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Abstract
The invention discloses a flotation method of compact blocky-structure low-grade collophanite, and relates to the technical field of compact collophanite flotation. The flotation method comprises the steps of firstly, crushing and grinding low-grade collophanite raw ore with a compact block structure to achieve mineral monomer dissociation, and controlling the concentration of ore pulp to be 18-24%; carrying out cyclone classification on the ore pulp, wherein the content of classification overflow fineness of-0.074 mm is 70-90%, and classification underflow settled sand is returned to a grinding machine for regrinding, and the sand return ratio is 300-400%; concentrating the graded overflow to obtain concentrated ore pulp with the concentration of 26-32%; and (3) inputting the dense ore pulp into a primary size mixing tank, adding inorganic acid for size mixing for 0.5-1 min, inputting into a secondary size mixing tank, adding a collecting agent for mineralization and size mixing for 2-3 min, and then performing air flotation. The concentration of the ore pulp is increased by adding concentration equipment, under the condition of the same dosage, the concentration of the agent in the ore pulp is increased from 70-100ppm to 110-130ppm, the total flotation time is increased by more than 6 minutes, and the flotation tailings P 2 O 5 The content is reduced by 1-3%, and the consumption of the medicament is reduced by 20-30%.
Description
Technical Field
The invention relates to the technical field of flotation of compact collophanite, in particular to a flotation method of low-grade collophanite with a compact block structure.
Background
Phosphate rock is an important component in agricultural fertilizers and phosphorus-based chemical preparations as a non-renewable resource. With the development of economy, the demand of phosphate ore is continuously and rapidly increasing. Although China is a large country of phosphorite resources, among the proved phosphorites, mainly sedimentary phosphorite (collophanite) accounts for 80% of the total amount, and most of the phosphorite is medium-low grade collophanite, and the ore has the characteristics of low grade, complex structure, fine disseminated particle size, difficult dissociation and the like. And with the continuous exploitation and utilization of phosphorite resources, the ore properties become increasingly poor, fine and miscellaneous, so that the ore is more difficult to select, and the collophanite with a compact block structure is more difficult to select. The compact block structure low grade collophanite is particularly suitable for this kind of collophanite, wherein P 2 O 5 18-24% of MgO, 4-9% of MgO and MgO/P 2 O 5 The material is 0.167-0.50, mainly takes a compact block structure (the content of-0.074 mm is less than 20 percent, the content of-0.030 mm is less than 10 percent), and the crushing ratio is more than 60. Because the mineral is embedded tightly and continuously, the crystal is fine, and the ore can be fully dissociated only by grinding the ore for multiple times. And because the size composition difference after ore grinding is small, the classification efficiency is low, which is mainly shown in that the phenomena of sand sedimentation and fine thickening and overflow and coarse running are serious, at the moment, the classification efficiency is improved by reducing the slurry concentration, but the slurry concentration is reduced, under the condition of ensuring the yield, the slurry amount entering the flotation is increased, the slurry flow rate is high, the flotation time is shortened, the consumption of flotation reagents is increased, the flotation index fluctuation is large, and the production operation is not facilitated.
Patent CN104707734A discloses a process for reducing the grade of collophanite flotation tailings, which comprises the following specific steps of grinding minerals, classifying ground products, returning coarse fraction products obtained by classification to a grinder for grinding, entering fine fraction products obtained by classification into a flotation process for reverse flotation, taking flotation foam products as final tailings, classifying products in a flotation tank, returning coarse fraction products obtained by classification as intermediate products to the grinder for grinding, and forming closed-loop operation. The method is directly used for flotation of the low-grade collophanite with the compact lump structure, and the MgO content in the phosphate concentrate is 1.3-1.4%, which cannot reach below 1% of the standard requirement.
Disclosure of Invention
The invention aims to provide a flotation method of low-grade collophanite with a compact block structure, which solves the problems of large consumption of flotation reagents and large fluctuation of flotation indexes caused by low slurry concentration in the existing flotation process.
In order to solve the technical problems, the invention adopts the following technical scheme: a flotation method of low-grade collophanite with a compact block structure is characterized by comprising the following steps:
(1) crushing and grinding the compact block-shaped low-grade collophanite raw ore to achieve mineral monomer dissociation, and controlling the concentration of ore pulp to be 18-24%;
(2) Carrying out cyclone classification on the ore pulp, wherein the content of classification overflow fineness of-0.074 mm is 70-90%, and classification underflow settled sand is returned to a grinding machine for regrinding, and the sand return ratio is 300-400%;
(3) concentrating the graded overflow in the step (2) to obtain concentrated ore pulp with the concentration of 26-32%;
(4) inputting the dense ore pulp into a primary size mixing tank, and adding inorganic acid for size mixing for 0.5-1 min;
(5) inputting the concentrated ore pulp subjected to size mixing in the step (4) into a secondary size mixing tank, and adding a collecting agent to mineralize and mix the pulp for 2-3 minutes;
(6) performing air flotation on the pulp mixed in the step (5), wherein the air inflation amount is 100-300L/m 2 ·min。
The further technical scheme is that the inorganic acid in the step (4) is a sulfuric acid solution with the concentration of 10-50%, and the using amount of the inorganic acid is 10-30 kg/t of raw ore.
The further technical scheme is that in the step (5), the collecting agent is formed by mixing fatty acid sodium salt and an ester foaming agent according to a mass ratio of 2.6-4: 1, and the using amount of the collecting agent is 0.3-1 kg/t of raw ore.
The further technical proposal is that the concentration device in the step (3) is a cyclone or a thickener.
The further technical scheme is that the inlet pressure of the cyclone is 0.1-0.15 MPa.
The further technical scheme is that the one-level size mixing tank is an acid and alkali resistant tank, the central part of the tank body is provided with a stirring device, blades are arranged along the length direction of the stirring main shaft, included angles between the blades and the axis of the stirring main shaft are 30-45 degrees, the blades are provided with two layers, and the blades on the upper layer and the lower layer are arranged in a staggered manner.
A further technical scheme is that a stirring device is arranged in the center of the secondary size mixing tank body, blades are arranged at the bottom of a stirring main shaft, a circulating cylinder is coaxially arranged on the stirring main shaft, and the circulating cylinder is located above the blades.
Compared with the prior art, the invention has the beneficial effects that: the concentration of the ore pulp is increased to 26-32% by adding the concentration equipment, under the condition of the same dosage, compared with the condition that the grading overflow directly enters the flotation, the concentration of the traditional Chinese medicine in the ore pulp is increased from 70-100ppm to 110-130ppm, under the condition that the flotation process flow is not changed, the total flotation time is increased by more than 6 minutes, and the flotation tailings P 2 O 5 The content is reduced by 1-3%, and the medicament consumption is reduced by 20-30%. The flotation separation performance of the ore pulp is improved through grading and size mixing, carbonate gangue minerals in the ore pulp are adjusted into hydrophobic minerals through first-level size mixing, and collecting agents are fully contacted with the hydrophobic minerals through second-level size mixing.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a schematic structural diagram of a primary size mixing tank according to the present invention.
FIG. 3 is a schematic structural diagram of a secondary slurry mixing tank in the invention.
In the figure: 1-tank body, 2-stirring main shaft, 3-paddle and 4-circulating cylinder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
For collophanite with 60% of compact block structure, 30% of stripe structure and 10% of other structure types, P 2 O 5 21% -22% of MgO content, 5%)6％、MgO/P 2 O 5 ＝0.167～0.50，SiO 2 The content is 13-15%, and the crushing ratio is more than 60.
Mineral monomer dissociation is achieved through multi-stage crushing and ore grinding, and the concentration of ore pulp is controlled to be 20% -24%. And carrying out cyclone classification on the ore pulp, wherein the content of classification overflow fineness of-0.074 mm is 75-85%. The settled sand of the graded underflow returns to the mill for regrinding, and the sand return ratio is 300-350%.
And thickening the graded overflow through a cyclone, wherein the inlet pressure of the cyclone is set to be 0.1-0.15 MPa. And (3) obtaining concentrated ore pulp with the concentration of 26-28%, inputting the concentrated ore pulp into a primary size mixing tank, adding inorganic acid for size mixing for 0.5-1 min, inputting the concentrated ore pulp into the primary size mixing tank, adding a collecting agent for size mixing for 0.5-1 min, and increasing the concentration of the medicinal agent in the ore pulp from 80ppm to 120ppm relative to overflow ore pulp which is not concentrated. Wherein the inorganic acid is a sulfuric acid solution with the concentration of 10-30%, the using amount is 10-15 kg/t of raw ore, the collecting agent is formed by mixing a fatty acid sodium salt and an ester foaming agent according to the mass ratio of 2.6-3: 1, and the using amount is 0.3-0.5 kg/t of raw ore.
Through the aeration flotation operation, the aeration quantity is 100-300L/m 2 Min, obtaining concentrate P 2 O 5 The content is more than 28.5 percent, the MgO content is 0.9 to 1.0 percent, and the MgO removal rate is more than 92 percent.
Example 2
P for collophanite with 40% of compact block structure, 40% of strip-shaped structure and 20% of other structure types 2 O 5 21-22% of MgO, 5-6% of MgO and MgO/P 2 O 5 ＝0.167～0.50，SiO 2 The content is 13-15%, and the crushing ratio is more than 60.
Mineral monomer dissociation is achieved through multi-stage crushing and ore grinding, and the concentration of ore pulp is controlled to be 20% -25%. And carrying out cyclone classification on the ore pulp, wherein the content of classification overflow fineness of-0.074 mm is 85-95%. The settled sand of the graded bottom flow is returned to the mill for regrinding, and the sand return ratio is 320-380%.
And thickening the graded overflow through a cyclone, wherein the inlet pressure of the cyclone is set to be 0.1-0.15 MPa. And (3) obtaining dense ore pulp with the concentration of 28-30%, inputting the dense ore pulp into a primary size mixing tank, adding inorganic acid for size mixing for 0.5-1 min, inputting the dense ore pulp into the primary size mixing tank, adding the inorganic acid for size mixing for 0.5-1 min, and increasing the concentration of the medicinal agent in the ore pulp from 90ppm to 115ppm relative to the overflow ore pulp which is not subjected to concentration. Wherein the inorganic acid is a sulfuric acid solution with the concentration of 20-45%, the using amount is 12-23 kg/t of raw ore, the collecting agent is formed by mixing a fatty acid sodium salt and an ester foaming agent according to the mass ratio of 2.8-3.5: 1, and the using amount is 0.45-0.8 kg/t of raw ore.
Through the aeration flotation operation, the aeration quantity is 100-300L/m 2 Min, obtaining concentrate P 2 O 5 The content is more than 28.5 percent, the MgO content is 0.9 to 1.0 percent, and the MgO removal rate is more than 92 percent.
Example 3
For collophanite with 50% of compact block structure, 30% of stripe structure and 20% of other structure types, P 2 O 5 21-22% of MgO, 5-6% of MgO and MgO/P 2 O 5 ＝0.167～0.50，SiO 2 The content is 13-15%, and the crushing ratio is more than 60.
Mineral monomer dissociation is achieved through multi-stage crushing and ore grinding, and the concentration of ore pulp is controlled to be 20% -25%. And (3) carrying out cyclone classification on the ore pulp, wherein the content of classification overflow fineness of-0.074 mm is 80-85%. The settled sand of the graded underflow is returned to the mill for regrinding, and the sand return ratio is 300-400%.
And thickening the graded overflow through a cyclone, wherein the inlet pressure of the cyclone is set to be 0.1-0.15 MPa. And (3) obtaining dense ore pulp with the concentration of 28-30%, inputting the dense ore pulp into a primary size mixing tank, adding inorganic acid for size mixing for 0.5-1 min, inputting the dense ore pulp into the primary size mixing tank, adding the inorganic acid for size mixing for 0.5-1 min, and increasing the concentration of the medicinal agent in the ore pulp from 70ppm to 125ppm relative to the overflow ore pulp which is not subjected to concentration mixing. The collecting agent is formed by mixing fatty acid sodium salt and an ester foaming agent according to the mass ratio of 3.2-4: 1, and the using amount of the collecting agent is 0.5-1 kg/t of raw ore.
Through the aeration flotation operation, the aeration quantity is 100-300L/m 2 Min, obtaining concentrate P 2 O 5 High in contentThe selection indexes are 28.5 percent, the MgO content is 0.9 to 1.0 percent, and the MgO removal rate is more than 92 percent.
Example 4
For accelerating the size mixing process, make ore pulp and medicament fully contact the mixture, as shown in fig. 2, the one-level size mixing tank is acid and alkali-resistant groove, and 1 central authorities of cell body are provided with agitating unit, are provided with paddle 3 along 2 length direction of stirring main shaft, and paddle 3 is 30 ~ 45 with 2 axis contained angles of stirring main shaft, and paddle 3 is provided with two-layerly, upper and lower layer paddle 3 dislocation arrangement. As shown in fig. 3, a stirring device is arranged in the center of the tank body 1 of the secondary size mixing tank, a paddle 3 is arranged at the bottom of the stirring main shaft 2, a circulating cylinder 4 is coaxially arranged on the stirring main shaft 2, and the circulating cylinder 4 is positioned above the paddle 3. Circulation section of thick bamboo 4 is upper and lower open-ended cavity barrel, and the inside wall passes through the pole welding on stirring main shaft 2, and when paddle 3 mixts the ore pulp, the lower part becomes the outside motion of ore pulp and forms negative pressure zone, and top ore pulp then follows circulation section of thick bamboo 4 inside entering from last down motion for the abundant cyclic motion of ore pulp, thereby makes medicament and ore pulp fully contact, further improves the flotation effect.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts or arrangements within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts or arrangements, other uses will also be apparent to those skilled in the art.
Claims (5)
1. A flotation method of low-grade collophanite with a compact block structure is characterized by comprising the following steps:
(1) crushing and grinding the compact block-shaped low-grade collophanite raw ore to achieve mineral monomer dissociation, and controlling the concentration of ore pulp to be 18-24%;
(2) carrying out cyclone classification on the ore pulp, wherein the content of classification overflow fineness of-0.074 mm is 70-90%, and classification underflow settled sand is returned to a grinding machine for regrinding, and the sand return ratio is 300-400%;
(3) concentrating the graded overflow in the step (2) to obtain concentrated ore pulp with the concentration of 26-32%;
(4) inputting the dense ore pulp into a primary size mixing tank, and adding inorganic acid for size mixing for 0.5-1 min;
(5) inputting the concentrated ore pulp subjected to size mixing in the step (4) into a secondary size mixing tank, and adding a collecting agent to mineralize and mix the pulp for 2-3 minutes;
(6) performing air flotation on the pulp mixed in the step (5), wherein the air inflation amount is 100-300L/m 2 ·min；
Wherein P in the low-grade collophanite 2 O 5 21-22% of MgO, 5-6% of MgO and MgO/P 2 O 5 ＝0.167～0.50，SiO 2 The content is 13-15%, the compact block structure accounts for 40-60%, and the crushing ratio is more than 60;
the primary size mixing tank is an acid and alkali resistant tank, a stirring device is arranged in the center of the tank body, blades are arranged along the length direction of the stirring main shaft, the included angle between each blade and the axis of the stirring main shaft is 30-45 degrees, the blades are arranged in two layers, and the blades on the upper layer and the blades on the lower layer are arranged in a staggered manner;
The stirring device is arranged in the center of the secondary size mixing tank body, blades are arranged at the bottom of the stirring main shaft, the stirring main shaft is coaxially provided with a circulating cylinder, and the circulating cylinder is located above the blades.
2. The flotation method for low-grade collophanite with compact block structure according to claim 1 is characterized in that: in the step (4), the inorganic acid is a sulfuric acid solution with the concentration of 10% -50%, and the using amount of the inorganic acid is 10-30 kg/t of raw ore.
3. The flotation method for low-grade collophanite with compact block structure according to claim 1 is characterized in that: in the step (5), the collecting agent is formed by mixing a fatty acid sodium salt and an ester foaming agent according to a mass ratio of 2.6-4: 1, and the using amount of the collecting agent is 0.3-1 kg/t of raw ore.
4. The flotation method for low-grade collophanite with compact block structure according to claim 1 is characterized in that: and (4) concentrating equipment in the step (3) is a cyclone or a thickener.
5. The flotation method of low-grade collophanite with compact block structure according to claim 4 is characterized in that: the inlet pressure of the cyclone is 0.1-0.15 MPa.
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| CN208700657U (en) * | 2018-07-11 | 2019-04-05 | 环能科技股份有限公司 | It is a kind of for surpassing the magnetic-coagulation apparatus and system of Magneto separate water process |
| CN110449260A (en) * | 2019-09-09 | 2019-11-15 | 平顶山华兴浮选工程技术服务有限公司 | A kind of middle grade monophosphate Collophanite flotation technique |
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| US4436616A (en) * | 1980-11-06 | 1984-03-13 | Philippe Dufour | Process for the beneficiation of phosphate ores |
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