CN113663814A - Method for stably improving concentrate grade in concentration and filtration system - Google Patents
Method for stably improving concentrate grade in concentration and filtration system Download PDFInfo
- Publication number
- CN113663814A CN113663814A CN202110796981.5A CN202110796981A CN113663814A CN 113663814 A CN113663814 A CN 113663814A CN 202110796981 A CN202110796981 A CN 202110796981A CN 113663814 A CN113663814 A CN 113663814A
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- Prior art keywords
- concentrate
- concentration
- grade
- thickener
- rare earth
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- 239000012141 concentrate Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001914 filtration Methods 0.000 title claims abstract description 19
- 239000002562 thickening agent Substances 0.000 claims abstract description 22
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 23
- 150000002910 rare earth metals Chemical class 0.000 claims description 23
- 230000005484 gravity Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000010419 fine particle Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 238000005352 clarification Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000003019 stabilising effect Effects 0.000 claims 1
- 238000005188 flotation Methods 0.000 abstract description 5
- 238000001556 precipitation Methods 0.000 abstract description 2
- 239000010802 sludge Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
- B03B5/64—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type of the free settling type
Abstract
The invention discloses a method for stably improving the grade of concentrate in a concentration and filtration system, which mainly ensures that the concentrate product is stably enriched by analyzing the precipitation rule and the operation flow of the concentrate in a thickener in the filtration system. The method essentially solves the problems that the concentrate is unstable in a separation system, particularly the concentrate has large grade fluctuation in flotation separation, so that the concentrate grade in a filtering system is unstable, and the concentrate grade can be increased by 2-3% in actual use.
Description
Technical Field
The invention relates to a method for stably improving the grade of concentrate in a concentration and filtration system.
Background
In the actual production, the grade of the rare earth concentrate of the flotation separation fluctuates between 53% and 60%, the filter adopts one or two preparation devices, the filter operates continuously for 24 hours, the filter is divided into a clarification area, a free settling area, an interference settling area and a compacting area in the ore feeding process of the thickener, a guide cylinder at the outlet end of a feeding vertical cylinder guides ore pulp to the periphery from the feeding vertical cylinder, so that the ore pulp diffuses to the periphery and enters a pre-formed sludge settling layer, the sludge settling layer plays a role in filtering, fine particles cannot rise, the fine particles are conveyed into the filter through an underflow pump, part of sludge impurities enter the thickener in the flotation separation process, the grade fluctuation of the concentrate is caused, the stable output cannot be realized, the grade of the finished product of the filtered rare earth concentrate fluctuates about 55%, and the stable output of the concentrate cannot reach 58%
Disclosure of Invention
The invention aims to provide a method for stably improving the concentrate grade in a concentration and filtration system, so that the concentrate grade in the filtration system is stabilized in the concentration process of the concentrate, and a certain concentrate grade is improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for stably improving the grade of concentrate in a concentration and filtration system changes continuous operation into stage operation, concentrate is required to be concentrated by a thickener until the concentration is 60-70 percent and then sent to a filter for turning, three filters are operated simultaneously, and the shutdown is carried out when the concentration of the concentrate is reduced to 45-55 percent;
firstly, conveying concentrate to an ore separation box by an underflow pump, and returning the concentrate to a large well for concentration, so that fine particles in a compact area can be continuously circulated in a thickener;
stopping the running of the underflow pump for 30 minutes when the concentration of the running vehicle is reached;
and thirdly, adding a large amount of clear water at the ore feeding end of the thickener to enable the clarification layer of the thickener to disappear and become a free settling layer, leading the rare earth ore with higher specific gravity to enter an interference settling layer and a compaction area in the settling process due to different specific gravity of the rare earth ore concentrate and the slime, so that the ore concentrate is enriched and then is conveyed to the filter through a underflow pump of the thickener to enable the rare earth ore concentrate to be stably output in the filter system, and the grade of the rare earth ore concentrate is stabilized between 58% and 60%.
Further, stopping the process when the concentration of the concentrate is reduced to 50%.
Furthermore, the slime impurities in the free settling layer are carried into an overflow eaves of the thickener by the rising buoyancy of water due to the light specific gravity, and the grade of the rare earth concentrate is 28-32% after sampling and overflowing, and the rare earth concentrate is returned to the raw ore well through an overflow pump.
Compared with the prior art, the invention has the beneficial technical effects that:
the method can lead the rare earth concentrate to obtain stable output in a filtering system, and the grade is stable between 58 percent and 60 percent;
the problem that the concentrate is unstable in a separation system, particularly the fluctuation of the concentrate grade in flotation separation is large, so that the concentrate grade in a filtering system is unstable, and the concentrate grade can be increased by 2-3% in actual use is solved.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a flow chart of filtration.
Detailed Description
As shown in figure 1, a method for stably improving the grade of concentrate in a concentration and filtration system mainly analyzes the precipitation rule and the operation flow of the concentrate in a thickener in the filtration system to ensure that the concentrate product is stably enriched.
Changing continuous operation into stage operation, requiring concentrate to be concentrated by a thickener until the concentration is 60-70%, sending the concentrate to a filter for turning, and simultaneously operating three filters, stopping the filter when the concentration of the concentrate is reduced to about 50%; firstly, conveying concentrate to an ore separation box by an underflow pump, and returning the concentrate to a large well for concentration, so that fine particles in a compact area can be continuously circulated in a thickener; stopping the running of the underflow pump for 30 minutes when the concentration of the running vehicle is reached; and thirdly, adding a large amount of clear water at the ore feeding end of the thickener to enable the clarification layer of the thickener to disappear and become a free settling layer, leading the rare earth ore with higher specific gravity to enter an interference settling layer and a compaction area in the settling process due to different specific gravity of the rare earth ore concentrate and the slime, so that the ore concentrate is enriched and then is conveyed to the filter through a underflow pump of the thickener to enable the rare earth ore concentrate to be stably output in the filter system, and the grade of the rare earth ore concentrate is stabilized between 58% and 60%.
And because the specific gravity of the slime impurities in the free settling layer is light, the slime impurities are brought into an overflow eaves of the thickener by the rising buoyancy of water, the grade of the rare earth concentrate is about 30 percent after sampling and overflowing, and the rare earth concentrate is returned to the raw ore well through an overflow pump.
Before the method is used, continuous sampling is carried out, 30 shifts are produced in total, the ore feeding concentration is 56% -59%, the average ore feeding concentration is 56%, the ore feeding concentration and the ore feeding time are relatively stable, the grade of the obtained rare earth concentrate is 53% -60%, 3000 tons of the produced rare earth concentrate are produced in total, the average grade of 10 shifts is less than 57.5%, and the production requirement is difficult to meet.
After the method is used, a stage-turning experiment is carried out, 30 shifts are continuously sampled, the ore feeding concentration is increased to 65% -70%, the turning time of each shift is 6 hours, 3000 tons of rare earth concentrate are produced in total, the concentrate grade is 58% -60%, and the average grade of mixed ore is 58.5%.
The method of the invention essentially solves the problems that the concentrate is unstable in a sorting system, especially the fluctuation of the concentrate grade in the flotation separation is large, so that the concentrate grade in a filtering system is unstable, and the concentrate grade can be increased by 2-3% in the actual use.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. A method for stably improving the grade of concentrate in a concentration and filtration system is characterized in that continuous operation is changed into stage operation, concentrate is required to be concentrated to 60% -70% by a thickener and then sent to a filter for turning, three filters are operated simultaneously, and the concentrate is stopped when the concentration is reduced to 45% -55%;
firstly, conveying concentrate to an ore separation box by an underflow pump, and returning the concentrate to a large well for concentration, so that fine particles in a compact area can be continuously circulated in a thickener;
stopping the running of the underflow pump for 30 minutes when the concentration of the running vehicle is reached;
and thirdly, adding a large amount of clear water at the ore feeding end of the thickener to enable the clarification layer of the thickener to disappear and become a free settling layer, leading the rare earth ore with higher specific gravity to enter an interference settling layer and a compaction area in the settling process due to different specific gravity of the rare earth ore concentrate and the slime, so that the ore concentrate is enriched and then is conveyed to the filter through a underflow pump of the thickener to enable the rare earth ore concentrate to be stably output in the filter system, and the grade of the rare earth ore concentrate is stabilized between 58% and 60%.
2. The method for stabilising concentrate grade in a concentrating filtration system according to claim 1, wherein the concentrate concentration is down to 50%.
3. The method for stably upgrading the concentrate in the concentration and filtration system according to claim 1, wherein the slime impurities in the free settling layer are brought into the overflow eaves of the thickener by the rising buoyancy of water due to the light specific gravity, and the rare earth concentrate grade is 28-32% after sampling and is returned to the crude well through the overflow pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110796981.5A CN113663814A (en) | 2021-07-14 | 2021-07-14 | Method for stably improving concentrate grade in concentration and filtration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110796981.5A CN113663814A (en) | 2021-07-14 | 2021-07-14 | Method for stably improving concentrate grade in concentration and filtration system |
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| Publication Number | Publication Date |
|---|---|
| CN113663814A true CN113663814A (en) | 2021-11-19 |
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| CN202110796981.5A Pending CN113663814A (en) | 2021-07-14 | 2021-07-14 | Method for stably improving concentrate grade in concentration and filtration system |
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Citations (15)
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|---|---|---|---|---|
| JP2003024819A (en) * | 2001-07-11 | 2003-01-28 | Mitsubishi Chemicals Corp | Suspended sedimentation type separator and method for the same |
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| CN102319632A (en) * | 2011-07-28 | 2012-01-18 | 内蒙古科技大学 | Beneficiation method for improving rare earth grade of rare earth ore |
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-
2021
- 2021-07-14 CN CN202110796981.5A patent/CN113663814A/en active Pending
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| CN102302973A (en) * | 2011-09-10 | 2012-01-04 | 昆明理工大学 | Improved suspended vibrating concentrating machine with conical surface |
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