CN113426569A - Novel metal ore dressing method - Google Patents
Novel metal ore dressing method Download PDFInfo
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- CN113426569A CN113426569A CN202110694275.XA CN202110694275A CN113426569A CN 113426569 A CN113426569 A CN 113426569A CN 202110694275 A CN202110694275 A CN 202110694275A CN 113426569 A CN113426569 A CN 113426569A
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Abstract
The invention provides a novel metal ore dressing method which comprises the following steps: step 1, grinding raw ore to obtain ore pulp; step 2, performing flotation on the ore pulp to obtain a first metal rough concentrate; step 3, conveying the metal rough concentrate I to a hydrocyclone for grading and regrinding treatment to obtain metal rough concentrate II; step 4, carrying out concentration on the metal rough concentrate II for 3 times to obtain metal concentrate I; step 5, sending the metal concentrate I into a mineral separation spin dryer for treatment to obtain metal concentrate II; and 6, carrying out four times of fine concentration and two times of scavenging on the metal concentrate II to obtain a required product metal concentrate III. According to the invention, the coarse concentrate with relatively low content is obtained by using less desiccants than the conventional method, so that the middling metal returned to the roughing system is relatively less, the recovery rate is relatively higher, and the impurities such as collecting agents and grease are removed by using the ore dressing drier to obtain the lower metal concentrate for flotation, so that the recovery rate of the metal concentrate is improved.
Description
Technical Field
The invention belongs to the technical field of mineral separation, and particularly relates to a novel metal ore separation method.
Background
In the existing metal ore dressing processing, in order to improve the recovery rate of metal concentrate, a large amount of collecting agent needs to be added in rough dressing, and then in order to improve the grade of the metal concentrate, a large amount of desiccants (more than or equal to 20 g/ton) needs to be added, and multiple times of fine dressing are carried out to obtain higher grade of the concentrate. In some practical ore dressing processes, a large amount of collecting agent needs to be added in roughing, a large amount of desiccants needs to be added in concentrating, and the desiccants cannot always achieve the expected effect. Meanwhile, the recovery rate of the metal concentrate can be reduced to different degrees by using a large amount of reagent removing agents to remove the reagents, and the obtained middling products need to be returned to a roughing system.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a novel metal ore dressing method. The technical problem to be solved by the invention is realized by the following technical scheme:
a novel metal ore dressing method comprises the following steps:
step 1, grinding raw ore to obtain ore pulp;
step 2, carrying out flotation on the ore pulp to obtain a first metal rough concentrate;
step 3, conveying the metal rough concentrate I to a hydrocyclone for grading and regrinding treatment, and performing flotation on the obtained fine-fraction mineral aggregate to obtain metal rough concentrate II;
step 4, carrying out concentration on the metal rough concentrate II for 3 times to obtain metal concentrate I, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, and the adding amount of the active carbon is 9-12 g/ton;
step 5, sending the metal concentrate I into a mineral separation spin dryer for treatment to obtain metal concentrate II;
and 6, carrying out concentration on the metal concentrate II for four times and scavenging for two times to obtain a required product metal concentrate III, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, the adding amount of the active carbon is 9-12 g/ton, and all middlings in the steps 1-6 are returned sequentially.
In one embodiment of the invention, the pulp concentration is 38% -39%, and the pulp concentration is-200 meshes, and 71% -72%.
In an embodiment of the present invention, the specific steps of step 2 are:
and carrying out primary roughing, three scavenging and five concentration on the ore pulp to obtain the metal rough concentrate I with the grade of 5-6%.
In an embodiment of the present invention, the specific steps of step 3 are: and (2) conveying the first metal rough concentrate to a sand pump pool of a hydrocyclone, conveying the ore pulp of the first metal rough concentrate in the sand pump pool to the hydrocyclone for classification by using a sand pump, regrinding the coarse fraction, conveying the regrinding product into the sand pump pool for conveying the hydrocyclone to form a closed process flow, and carrying out concentration on the fine fraction for four times to obtain a second metal rough concentrate with the grade of 20-22%.
In one embodiment of the invention, the grade of the first metal concentrate in the step 4 is 36% -37%.
In one embodiment of the invention, the grade of the metal concentrate three in step 6 is 47% -48.14%.
In one embodiment of the invention, the activated carbon is added in an amount of 10 g/ton.
The invention has the beneficial effects that:
according to the invention, the less removing agents are used than the conventional removing agents to obtain the relatively lower rough concentrate, so that the middling metal returned to the roughing system is relatively less, the recovery rate is relatively higher, impurities such as collecting agents and grease are removed by using a dressing drier to obtain the lower metal concentrate, and then the lower metal concentrate is subjected to flotation, so that the composition of the lower metal concentrate is changed and improved, the flotation condition is also improved, and thus the metal concentrate is easier to improve when the concentration is performed. The selected middlings contain less harmful substances, so that when the middlings return to the roughing system during grinding, the beneficiation conditions are improved, and the recovery rate of the metal concentrate is improved. The method is suitable for the concentration of various low-grade fine-grained metal ores.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a flow chart of a novel metal ore beneficiation method provided by the invention.
Figure 2 is a flow diagram of a prior art metal ore beneficiation process.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Example one
As shown in fig. 1, the present embodiment provides a novel metal ore beneficiation method, including the following steps:
step 1, grinding raw ore to obtain ore pulp, wherein the concentration of the ore pulp is 38% -39%, and the concentration of the ore pulp is-200 meshes and 71% -72%.
And 2, carrying out flotation on the ore pulp to obtain a first metal rough concentrate.
And 3, conveying the metal rough concentrate I to a hydrocyclone for grading and regrinding, and performing flotation on the obtained fine-fraction mineral aggregate to obtain metal rough concentrate II.
And 4, carrying out concentration on the metal rough concentrate II for 3 times to obtain metal concentrate I, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, and the addition amount of the active carbon is 9-12 g/ton.
And 5, sending the metal concentrate I into a mineral separation spin dryer for treatment to obtain metal concentrate II.
And 6, carrying out concentration on the metal concentrate II for four times and scavenging for two times to obtain a required product metal concentrate III, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, the adding amount of the active carbon is 9-12 g/ton, and all middlings in the steps 1-6 are returned sequentially.
In the embodiment, the coarse concentrate with relatively low grade is obtained by using less desiccants than the conventional coarse concentrate, so that the middling metal returned to the roughing system is relatively less, and the recovery rate is relatively higher. Relatively low metal concentrates contain a large amount of collectors which react with the minerals and are stirred in the flotation machine to form various gels, greases, etc., which are difficult to remove by flotation. Therefore, the high-speed spin dryer is utilized on site to remove the impurities such as the collecting agent, the grease and the like, the lower metal concentrate from which the impurities such as the collecting agent, the grease and the like are removed is removed, and then the flotation is carried out, the composition of the lower metal concentrate is changed, the improvement is achieved, in the flotation process, the impurities such as the collecting agent, the foaming agent, the grease and the like which need to be removed can be removed, the flotation condition is also improved, in the process of carrying out the concentration, the metal concentrate is easier to improve, the concentrated middlings contain less harmful substances, and when returning the middlings to a roughing system during grinding, the mineral separation condition is also improved, and the recovery rate of the metal concentrate is also improved.
In the present invention, the amount of activated carbon is added relative to the amount of the second metal rough concentrate and the second metal concentrate.
Example two
The embodiment provides a novel metal ore dressing method, which comprises the following steps:
step 21, grinding raw metal ores to obtain ore pulp; the concentration of the ore pulp is 38% -39%, and the ore pulp is 71% -72% with-200 meshes.
And step 22, performing one-time roughing, three-time scavenging and five-time fine selection on the ore pulp to obtain the metal rough concentrate I with the grade of 5% -6%.
And 23, conveying the first metal rough concentrate to a sand pump pool of a hydrocyclone, conveying the ore pulp of the first metal rough concentrate in the sand pump pool to the hydrocyclone by using a sand pump for classification, regrinding the coarse fraction, conveying the regrinding product into the sand pump pool for conveying the hydrocyclone to form a closed process flow, and carrying out concentration on the fine fraction for four times to obtain a second metal rough concentrate with the grade of 20-22%.
And 24, carrying out concentration on the metal rough concentrate II for 3 times to obtain metal concentrate I with the grade of 36-37%, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, and the adding amount of the active carbon is 9-12 g/ton.
And 25, sending the first metal concentrate into a mineral separation drying machine for treatment to obtain a second metal concentrate.
And 26, carrying out four times of concentration and two times of scavenging on the metal concentrate II to obtain 47% -48.14% of metal concentrate III, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, the addition amount of the active carbon is 9-12 g/ton, and all middlings in the steps 21-26 are returned sequentially.
EXAMPLE III
Referring to fig. 1, the present embodiment provides a novel metal ore beneficiation method, in which a raw ore is derived from a certain subway molybdenum ore, including the following steps:
step 31, grinding raw iron and molybdenum ore to obtain ore pulp; the concentration of the ore pulp is 38 percent and 72 percent of minus 200 meshes.
And step 32, performing one-time roughing, three-time scavenging and five-time fine selection on the ore pulp to obtain the first molybdenum rough concentrate with the grade of 6%.
And 33, conveying the molybdenum rough concentrate I to a sand pump pool of a hydrocyclone, conveying the ore pulp of the molybdenum rough concentrate I in the sand pump pool to the hydrocyclone by using a sand pump for classification, regrinding the coarse fraction, conveying the regrinding product into the sand pump pool for conveying the hydrocyclone to form a closed process flow, and carrying out concentration on the fine fraction for four times to obtain the molybdenum rough concentrate II with the grade of 21%.
And step 34, carrying out concentration on the molybdenum rough concentrate II for 3 times to obtain the molybdenum concentrate I with the grade of 36%, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, and the adding amount of the active carbon is 10 g/ton.
And step 35, sending the molybdenum concentrate I into a mineral separation drier to remove impurities such as collecting agents and grease, and obtaining an improved molybdenum concentrate II containing a smaller amount of impurities such as collecting agents and grease.
And step 36, carrying out four-time concentration and two-time scavenging on the molybdenum concentrate II to obtain a molybdenum concentrate III with the grade of 48.14%, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, the addition amount of the active carbon is 10 g/ton, and all middlings in the steps 31-36 are returned sequentially.
In the present embodiment, the chemical agents and the amounts used in each step can be referred to as labeled in fig. 1. In this example, the amount of activated carbon was added with respect to the amount of the second molybdenum rough concentrate and the second molybdenum concentrate.
Example four
The embodiment provides a novel metal ore beneficiation method, raw ore is from molybdenum ore of a certain subway, and the method comprises the following steps:
step 41, grinding raw iron and molybdenum ore to obtain ore pulp; the concentration of the ore pulp is 39 percent, and the ore pulp is 71 percent of 200 meshes.
And 42, performing primary roughing, three scavenging and five concentration on the ore pulp to obtain the molybdenum rough concentrate I with the grade of 5.3%.
And 43, conveying the molybdenum rough concentrate I to a sand pump pool of a hydrocyclone, conveying the ore pulp of the molybdenum rough concentrate I in the sand pump pool to the hydrocyclone by using a sand pump for classification, regrinding the coarse fraction, conveying the regrinding product into the sand pump pool for conveying the hydrocyclone to form a closed process flow, and carrying out concentration on the fine fraction for four times to obtain the molybdenum rough concentrate II with the grade of 20.6%.
And 44, carrying out concentration on the molybdenum rough concentrate II for 3 times to obtain the molybdenum concentrate I with the grade of 36.2%, wherein an inhibitor sodium thioglycolate and a pesticide-removing active carbon are added in the concentration process of the step, and the addition amount of the active carbon is 9 g/ton.
And step 45, sending the molybdenum concentrate I into a mineral separation drier to remove impurities such as collecting agents and grease, and obtaining an improved molybdenum concentrate II containing a smaller amount of impurities such as collecting agents and grease.
And step 46, carrying out concentration on the molybdenum concentrate II for four times and scavenging for two times to obtain a molybdenum concentrate III with the grade of 47.6%, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, the addition amount of the active carbon is 9 g/ton, and all middlings in the steps 41-46 are returned sequentially.
In this embodiment, other chemical agents and amounts used in each step, except for the pulp concentration and the amount of activated carbon used in step 46, can be referred to as labeled in fig. 1. In this example, the amount of activated carbon was added with respect to the amount of the second molybdenum rough concentrate and the second molybdenum concentrate.
EXAMPLE five
The embodiment provides a novel metal ore beneficiation method, raw ore is from molybdenum ore of a certain subway, and the method comprises the following steps:
step 51, grinding raw iron and molybdenum ore to obtain ore pulp; the concentration of the ore pulp is 38.6 percent, and the ore pulp is 71 percent of 200 meshes.
And step 52, performing one-time roughing, three-time scavenging and five-time concentrating on the ore pulp to obtain the molybdenum rough concentrate I with the grade of 5%.
And 53, conveying the molybdenum rough concentrate I to a sand pump pool of a hydrocyclone, conveying the ore pulp of the molybdenum rough concentrate I in the sand pump pool to the hydrocyclone by using a sand pump for classification, regrinding the coarse fraction, conveying the regrinding product into the sand pump pool for conveying the hydrocyclone to form a closed process flow, and carrying out concentration on the fine fraction for four times to obtain the molybdenum rough concentrate II with the grade of 20%.
And step 54, carrying out concentration on the molybdenum rough concentrate II for 3 times to obtain the molybdenum concentrate I with the grade of 37%, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, and the adding amount of the active carbon is 11 g/ton.
And step 55, sending the molybdenum concentrate I into a mineral separation drier to remove impurities such as collecting agents and grease, and obtaining an improved molybdenum concentrate II containing a smaller amount of impurities such as collecting agents and grease.
And 56, carrying out four-time concentration and two-time scavenging on the molybdenum concentrate II to obtain a molybdenum concentrate III with the grade of 47.86%, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, the addition amount of the active carbon is 11 g/ton, and all middlings in the steps 51-56 are returned sequentially.
In this embodiment, in addition to the pulp concentration and the amount of activated carbon used in step 56, other chemical agents and amounts used in each step can be referred to as labeled in fig. 1. In this example, the amount of activated carbon was added with respect to the amount of the second molybdenum rough concentrate and the second molybdenum concentrate.
EXAMPLE six
The embodiment provides a novel metal ore beneficiation method, raw ore is from molybdenum ore of a certain subway, and the method comprises the following steps:
step 61, grinding raw iron and molybdenum ore to obtain ore pulp; the concentration of the ore pulp is 38.5 percent, and the ore pulp is 71.7 percent of 200 meshes.
And step 62, performing one-time roughing, three-time scavenging and five-time fine selection on the ore pulp to obtain the molybdenum rough concentrate I with the grade of 5.4%.
And 63, conveying the molybdenum rough concentrate I to a sand pump pool of a hydrocyclone, conveying the ore pulp of the molybdenum rough concentrate I in the sand pump pool to the hydrocyclone by using a sand pump for classification, regrinding the coarse fraction, conveying the regrinding product into the sand pump pool for conveying the hydrocyclone to form a closed process flow, and carrying out concentration on the fine fraction for four times to obtain the molybdenum rough concentrate II with the grade of 22%.
And 64, carrying out concentration on the molybdenum rough concentrate II for 3 times to obtain a molybdenum concentrate I with the grade of 36.4%, wherein inhibitor sodium thioglycolate and pesticide-removing activated carbon are added in the concentration process of the step, and the addition amount of the activated carbon is 12 g/ton.
And 65, sending the molybdenum concentrate I into a mineral separation drier to remove impurities such as collecting agents and grease, and obtaining an improved molybdenum concentrate II containing a smaller amount of impurities such as collecting agents and grease.
And 66, carrying out four times of concentration and two times of scavenging on the molybdenum concentrate II to obtain a molybdenum concentrate III with the grade of 47%, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, the adding amount of the active carbon is 12 g/ton, and all middlings in the steps 61-66 are returned sequentially.
In this embodiment, in addition to the pulp concentration and the amount of activated carbon used in step 66, other chemical agents and amounts used in each step can be referred to as labeled in fig. 1. In this example, the amount of activated carbon was added with respect to the amount of the second molybdenum rough concentrate and the second molybdenum concentrate.
Comparative example
The comparative example is a conventional iron-molybdenum ore beneficiation method, referring to fig. 2, raw ore is ground to obtain a qualified ore pulp product, the ore pulp concentration is 38%, and the ore pulp concentration is 72% of minus 200 meshes. Obtaining molybdenum rough concentrate 1 with the grade of about 6% through one rough concentration, three times of scavenging and five times of fine concentration; the molybdenum rough concentrate 1 enters a sand pump pool conveyed to a hydrocyclone, ore pulp in the sand pump pool is conveyed to the hydrocyclone by a sand pump for classification, regrinding is carried out on the rough fraction, reground products also enter the sand pump pool of the conveying hydrocyclone to form a closed process flow, and fine fraction is refined for four times to obtain a concentrate 2 with the molybdenum concentrate grade of 29%; and (3) carrying out concentration on the concentrate 2 for 3 times, adding sodium thioglycolate and activated carbon for reagent removal in the concentration for three times, wherein the addition amount of the activated carbon is 20 g/ton, thus obtaining the molybdenum concentrate 3 with the grade of 43.13%, and the total recovery rate of the molybdenum concentrate is 77.49%. All the middlings above are returned in sequence. In this comparative example, other chemicals and amounts used in each step can be referred to as indicated in fig. 2.
The technical indexes tested in the above examples and comparative examples are as follows:
TABLE 1
As can be seen from Table 1, the method of the present invention can greatly improve the recovery rate of molybdenum concentrate and the grade of molybdenum concentrate under the condition of almost same concentration of ore pulp.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A novel metal ore beneficiation method is characterized by comprising the following steps:
step 1, grinding raw ore to obtain ore pulp;
step 2, carrying out flotation on the ore pulp to obtain a first metal rough concentrate;
step 3, conveying the metal rough concentrate I to a hydrocyclone for grading and regrinding treatment, and performing flotation on the obtained fine-fraction mineral aggregate to obtain metal rough concentrate II;
step 4, carrying out concentration on the metal rough concentrate II for 3 times to obtain metal concentrate I, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, and the adding amount of the active carbon is 9-12 g/ton;
step 5, sending the metal concentrate I into a mineral separation spin dryer for treatment to obtain metal concentrate II;
and 6, carrying out concentration on the metal concentrate II for four times and scavenging for two times to obtain a required product metal concentrate III, wherein inhibitor sodium thioglycolate and pesticide-removing active carbon are added in the concentration process of the step, the adding amount of the active carbon is 9-12 g/ton, and all middlings in the steps 1-6 are returned sequentially.
2. A novel metal ore dressing method according to claim 1, characterized in that the ore pulp concentration is 38% -39%, -200 mesh 71% -72%.
3. The novel metal ore dressing method according to claim 2, characterized in that the specific steps of step 2 are as follows:
and carrying out primary roughing, three scavenging and five concentration on the ore pulp to obtain the metal rough concentrate I with the grade of 5-6%.
4. A novel metal ore dressing method according to claim 3, characterized in that the specific steps of step 3 are as follows: and (2) conveying the first metal rough concentrate to a sand pump pool of a hydrocyclone, conveying the ore pulp of the first metal rough concentrate in the sand pump pool to the hydrocyclone for classification by using a sand pump, regrinding the coarse fraction, conveying the regrinding product into the sand pump pool for conveying the hydrocyclone to form a closed process flow, and carrying out concentration on the fine fraction for four times to obtain a second metal rough concentrate with the grade of 20-22%.
5. The novel metal ore dressing method according to claim 4, wherein the grade of the first metal concentrate in the step 4 is 36% -37%.
6. The novel metal ore dressing method according to claim 4, characterized in that the grade of the metal concentrate III in the step 6 is 47% -48.14%.
7. A novel metal ore dressing method according to claim 6, characterized in that the addition amount of said activated carbon is 10 g/ton.
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