CN109290049B - Beneficiation method for removing radioactivity of quartz feldspar concentrate - Google Patents
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- 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
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- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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Abstract
The invention belongs to the technical field of beneficiation, and particularly relates to a beneficiation method for removing radioactivity of quartz feldspar concentrates.
Description
Technical Field
The invention belongs to the technical field of beneficiation, and particularly relates to a beneficiation method for removing radioactivity of quartz feldspar concentrates.
Background
On the roads of China advancing to moderately developed countries, a large amount of resources are required to be supported for a long time. With the increasing scarcity of mineral resources, low-grade and co-associated resources have been listed as main resources to be developed and utilized on a large scale, especially rare, rare earth, rare and other strategic resources. However, in the development process of the strategic resource, because the raw ore is low in grade, a large amount of tailings can be generated, a part of the tailings is enrichment of quartz feldspar, but the 'three rare' resource often contains high radioactivity at the same time, so that the quartz feldspar cannot be utilized due to excessive radioactivity, in addition, similar quartz feldspar enrichment can be generated in the hydrometallurgy process of uranium, and long-term hidden danger is caused to the regional environment due to long-term large accumulation of the tailings with excessive radioactivity.
At present, a plurality of methods for purifying the quartz feldspar are adopted, the ore dressing and separation method of the quartz feldspar is mature, but few methods or related researches for removing radioactivity of the quartz feldspar bulk concentrate exist, and radioactivity cannot be effectively removed by adopting methods such as water washing, acid washing, magnetic separation, flotation and the like.
The invention adopts a magnetic separation-gravity separation combined ore dressing technology, can effectively reduce the radioactivity in the quartz feldspar bulk concentrates, adopts a pure physical ore dressing mode, does not need any chemical reagent, and has economic and environmental benefits.
Disclosure of Invention
Based on the above problems, an object of the present invention is to provide a beneficiation method that can remove high radioactivity of high-radioactivity quartz feldspar ore concentrate.
The technical scheme of the invention is as follows:
the invention provides a beneficiation method for removing radioactivity of quartz feldspar concentrates, which comprises the following steps:
(1) strong magnetic separation: grinding quartz feldspar bulk concentrates with excessive radioactivity, then carrying out strong magnetic separation on the ground fine powder, wherein the strong magnetic separation comprises a closed flow consisting of primary roughing and primary scavenging, the roughing concentrates and the roughing tailings are obtained after roughing, the roughing tailings are subjected to primary scavenging to obtain scavenging concentrates and scavenging tailings, the scavenging concentrates are returned to the primary roughing through the closed flow, and the scavenging tailings are the strong magnetic tailings;
(2) and (3) reselecting the shaking table at a first stage: performing first-stage table reselection on the strong magnetic tailings to obtain first-stage table reselection concentrate and first-stage table reselection tailings;
(3) and (3) reselecting a second-stage shaking table: and grinding the first-stage table concentrator reselected tailings, and then carrying out second-stage table concentrator reselecting to obtain second-stage table concentrator reselected concentrate, second-stage table concentrator reselected middling and second-stage table concentrator reselected tailings, wherein the second-stage table concentrator reselected middling is the quartz feldspar concentrate without radioactivity.
The ore dressing method comprises the following steps of firstly, adopting strong magnetic separation to effectively remove weak-magnetic radioactive minerals such as thorium-containing or uranium rare earth minerals, thorium-containing or uranium niobium minerals and thorium-containing or uranium iron minerals in quartz feldspar bulk concentrates; and combining two times of table reselection, separating a small amount of high-specific-gravity and high-radioactivity minerals such as thorite, zircon and the like in the quartz feldspar bulk concentrate from the quartz feldspar, so that the radioactivity of the quartz feldspar concentrate is effectively reduced. In addition, fine-grained mineral separation is efficiently carried out through twice table reselection, and meanwhile, the method has an excellent desliming effect and greatly improves the purity and quality of the quartz feldspar concentrate.
According to the beneficiation method for removing the radioactivity of the quartz feldspar ore concentrate, the purity of the quartz feldspar bulk concentrate with the radioactivity exceeding the standard is more than 90%.
According to the ore dressing method for removing the radioactivity of the quartz feldspar ore concentrate, the magnetic field intensity of the primary roughing is 2.0-3.0T, the magnetic field intensity of the primary scavenging is 2.0-3.5T, and some radioactive minerals with magnetism are embedded in the quartz feldspar ore concentrate, such as: monazite, thorite, and easy-to-dissolve stone, which can be removed by strong magnetic separation to improve the purity of quartz feldspar ore concentrate.
According to the ore dressing method for removing the radioactivity of the quartz feldspar ore concentrate, in the step (1), the granularity of ground ore is-0.1 mm & gt 80%, and the dissociation degree of the quartz feldspar ore concentrate and the radioactive ore is realized as far as possible by controlling the granularity.
According to the ore dressing method for removing the radioactivity of the quartz feldspar ore concentrate, in the step (1), the ground fine powder is prepared into ore pulp with the concentration of 10-30%, and then wet-type strong magnetic separation is carried out.
According to the ore dressing method for removing the radioactivity of the quartz feldspar ore concentrate, in the step (3), the granularity of ground ore is-0.05 mm & gt 80%, and the dissociation degree of the quartz feldspar ore concentrate and the radioactive ore is realized as far as possible by controlling the granularity.
According to the ore dressing method for removing the radioactivity of the quartz feldspar ore concentrate, in the step (3), the fine powder with the further reduced granularity after ore grinding is blended into ore pulp with the concentration of 10-30%, and then secondary table concentrator reselection is carried out, some radioactive minerals with magnetism embedded in the quartz feldspar ore concentrate still remain in the quartz feldspar ore concentrate after strong magnetic separation, the proportions of the radioactive minerals are relatively high, and the radioactive minerals in the quartz feldspar mixed ore concentrate with the excessive radioactivity can be removed gradually through the methods of sectional ore grinding and sectional reselection, so that the purity of the quartz feldspar ore concentrate is improved.
The quartz feldspar concentrate is prepared by the ore dressing method for removing the radioactivity of the quartz feldspar concentrate.
According to the quartz feldspar concentrate provided by the invention, the purity of the quartz feldspar concentrate is more than 95%.
The quartz feldspar ore concentrate has the total radioactivity ratio of 3.35 x 103Bq/kg or less. The radioactivity exceeds the building main body material requirements or the decoration and finishing material requirements of building material radionuclide limit standard (GB6566-2010), or meets the requirements of C-class decoration and finishing materials but exceeds the requirements of B-class decoration and finishing materials, or meets the requirements of B-class decoration and finishing materials but exceeds the requirements of A-class decoration and finishing materials.
The invention has the beneficial effects that:
according to the beneficiation method for removing the radioactivity of the quartz feldspar concentrates, the quartz feldspar bulk concentrates with excessive radioactivity are used as raw materials, and strong magnetic separation and twice table gravity separation are combined, so that radioactive mineral substances in the quartz feldspar bulk concentrates are effectively removed, the radioactivity of the quartz feldspar concentrates is greatly reduced, the requirement on the radioactivity of building and decoration materials is met, and meanwhile, the purity and the quality of the quartz feldspar concentrates are greatly improved.
In addition, the beneficiation method provided by the invention takes the quartz feldspar bulk concentrate with the radioactivity exceeding the standard as the raw material to obtain the quartz feldspar concentrate with qualified radioactivity, so that the comprehensive utilization rate of resources is improved, the accumulation of mine tailings is reduced, and the beneficiation method belongs to the mine emission reduction technology advocated by the state in the fields of the thirteen-five resources and the environment.
Finally, the beneficiation method only combines strong magnetic separation and table gravity separation, avoids a flotation method with high cost and chemical pollution, can recycle beneficiation backwater, and is clean, efficient and environment-friendly, and the beneficiation cost is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Figure 1 is a process flow diagram of the beneficiation process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1
In a total radioactivity ratio of 8.53X 103Bq/kg, internal radiation index IRa2.2, external irradiation index IrThe invention provides a beneficiation method for removing radioactivity of quartz feldspar concentrates, which takes quartz feldspar mixed concentrates with 3.0, granularity of-0.1 mm accounting for 85% and purity of 96.30% as raw materials, and comprises the following steps:
(1) strong magnetic separation: grinding 1kg of quartz feldspar bulk concentrate with excessive radioactivity, wherein the granularity is-0.1 mm and is more than 85%, then blending the ground fine powder into ore pulp with the concentration of 10%, and then carrying out wet-type strong magnetic separation, wherein the strong magnetic separation comprises a closed-loop process consisting of primary roughing and primary scavenging, the roughing is carried out to obtain roughing concentrate and roughing tailings, the roughing tailings are subjected to primary scavenging to obtain scavenging concentrate and scavenging tailings, the scavenging concentrate is returned to the primary roughing through the closed-loop process, and the scavenging tailings are strong magnetic tailings; the magnetic field intensity of the primary roughing is 3.0T, and the magnetic field intensity of the primary scavenging is 2.0T;
(2) and (3) reselecting the shaking table at a first stage: performing first-stage table reselection on the strong magnetic tailings to obtain first-stage table reselection concentrate and first-stage table reselection tailings;
(3) and (3) reselecting a second-stage shaking table: grinding the first-stage table concentrator reselected tailings, reducing the granularity to-0.05 mm which is more than 95%, blending the fine powder with the further reduced granularity after grinding into ore pulp with the concentration of 30%, and then performing second-stage table concentrator reselection to obtain second-stage table concentrator reselected concentrate, second-stage table concentrator reselected middlings and second-stage table concentrator reselected tailings, wherein the second-stage table concentrator reselected middlings are quartz feldspar concentrates with radioactivity removed, and the measured purity of the quartz feldspar concentrates is 98.60%, the recovery rate is 78.12%, and the total radioactivity ratio is 3.35 multiplied by 103Bq/kg, internal radiation index IRa1.2, external irradiation index Ir1.5, meets the requirements of class B decorative and finishing materials in building material radionuclide limit standards (GB6566-2010), and can be used as class B decorative and finishing materials.
Example 2
With a total radioactivity ratio of 7.78X 103Bq/kg, internal radiation index IRa1.8, external irradiation index IrThe invention provides a beneficiation method for removing radioactivity of quartz feldspar concentrates, which takes quartz feldspar mixed concentrates with the granularity of 2.8, the granularity of-0.1 mm accounting for 80% and the purity of 94.35% as raw materials, and comprises the following steps:
(1) strong magnetic separation: grinding 1kg of quartz feldspar bulk concentrate with excessive radioactivity, wherein the granularity is-0.1 mm and is more than 80%, then blending the ground fine powder into ore pulp with the concentration of 30%, and then carrying out wet-type strong magnetic separation, wherein the strong magnetic separation comprises a closed-loop process consisting of primary roughing and primary scavenging, the roughing is carried out to obtain roughing concentrate and roughing tailings, the roughing tailings are subjected to primary scavenging to obtain scavenging concentrate and scavenging tailings, the scavenging concentrate is returned to the primary roughing through the closed-loop process, and the scavenging tailings are strong magnetic tailings; the magnetic field intensity of the primary roughing is 2.0T, and the magnetic field intensity of the primary scavenging is 3.5T;
(2) and (3) reselecting the shaking table at a first stage: performing first-stage table reselection on the strong magnetic tailings to obtain first-stage table reselection concentrate and first-stage table reselection tailings;
(3) and (3) reselecting a second-stage shaking table: grinding the first-stage table concentrator reselected tailings, reducing the granularity to-0.05 mm which is more than 95%, blending the fine powder with the further reduced granularity after grinding into ore pulp with the concentration of 20%, and then performing second-stage table concentrator reselection to obtain second-stage table concentrator reselected concentrate, second-stage table concentrator reselected middlings and second-stage table concentrator reselected tailings, wherein the second-stage table concentrator reselected middlings are quartz feldspar concentrates with radioactivity removed, and the measured purity of the quartz feldspar concentrates is 95.00%, the recovery rate is 70.00%, and the total radioactivity ratio is 2.89 multiplied by 103Bq/kg, internal radiation index IRa1.0, external irradiation index Ir1.3, meets the requirements of class A decoration and finishing materials in building material radionuclide limit standard (GB6566-2010), and can be used as unlimited decoration and finishing materials.
Example 3
With a total radioactivity ratio of 3.55X 103Bq/kg, internal radiation index IRa1.2, external irradiation index IrThe invention provides a beneficiation method for removing radioactivity of quartz feldspar concentrates, which takes quartz feldspar mixed concentrates with the granularity of 1.5, the granularity of-0.1 mm accounting for 87% and the purity of 97.25% as raw materials, and comprises the following steps:
(1) strong magnetic separation: grinding 1kg of quartz feldspar bulk concentrate with excessive radioactivity, wherein the granularity is-0.1 mm & gt 87%, then blending the ground fine powder into ore pulp with the concentration of 20%, and then carrying out wet-type strong magnetic separation, wherein the strong magnetic separation comprises a closed-loop process consisting of primary roughing and primary scavenging, the roughing is carried out to obtain roughing concentrate and roughing tailings, the roughing tailings are subjected to primary scavenging to obtain scavenging concentrate and scavenging tailings, the scavenging concentrate is returned to the primary roughing through the closed-loop process, and the scavenging tailings are strong magnetic tailings; the magnetic field intensity of the primary roughing is 3.0T, and the magnetic field intensity of the primary scavenging is 3.5T;
(2) and (3) reselecting the shaking table at a first stage: performing first-stage table reselection on the strong magnetic tailings to obtain first-stage table reselection concentrate and first-stage table reselection tailings;
(3) and (3) reselecting a second-stage shaking table: grinding the first-stage table concentrator reselected tailings, reducing the granularity to-0.05 mm which is more than 95%, blending the fine powder with the further reduced granularity after grinding into ore pulp with the concentration of 10%, and then performing second-stage table concentrator reselection to obtain second-stage table concentrator reselected concentrate, second-stage table concentrator reselected middlings and second-stage table concentrator reselected tailings, wherein the second-stage table concentrator reselected middlings are quartz feldspar concentrates with radioactivity removed, and the measured purity of the quartz feldspar concentrates is 98.70%, the recovery rate is 79.56%, and the total radioactivity ratio is 1.10 multiplied by 103Bq/kg, internal radiation index IRa0.8, external irradiation index Ir1.2, meets the requirements of class A decoration and finishing materials in building material radionuclide limit standard (GB6566-2010), and can be used as unlimited decoration and finishing materials.
Example 4
In a total radioactivity ratio of 9.05X 103Bq/kg, internal radiation index IRa2.6, external irradiation index IrThe invention provides a beneficiation method for removing radioactivity of quartz feldspar concentrates, which takes quartz feldspar mixed concentrates with 3.3 percent, 85 percent of granularity of-0.1 mm and 93.55 percent of purity as raw materials, and comprises the following steps:
(1) strong magnetic separation: grinding 1kg of quartz feldspar bulk concentrate with excessive radioactivity, wherein the granularity is-0.1 mm and is more than 85%, then blending the ground fine powder into ore pulp with the concentration of 10%, and then carrying out wet-type strong magnetic separation, wherein the strong magnetic separation comprises a closed-loop process consisting of primary roughing and primary scavenging, the roughing is carried out to obtain roughing concentrate and roughing tailings, the roughing tailings are subjected to primary scavenging to obtain scavenging concentrate and scavenging tailings, the scavenging concentrate is returned to the primary roughing through the closed-loop process, and the scavenging tailings are strong magnetic tailings; the magnetic field intensity of the primary roughing is 2.0T, and the magnetic field intensity of the primary scavenging is 3.0T;
(2) and (3) reselecting the shaking table at a first stage: performing first-stage table reselection on the strong magnetic tailings to obtain first-stage table reselection concentrate and first-stage table reselection tailings;
(3) and (3) reselecting a second-stage shaking table: grinding the first-stage table concentrator reselected tailings, reducing the granularity to-0.05 mm which is more than 95%, blending the fine powder with the further reduced granularity after grinding into ore pulp with the concentration of 25%, and then performing second-stage table concentrator reselection to obtain second-stage table concentrator reselected concentrate, second-stage table concentrator reselected middlings and second-stage table concentrator reselected tailings, wherein the second-stage table concentrator reselected middlings are quartz feldspar concentrates with radioactivity removed, and the measured quartz feldspar concentrate purity is 95.67%, the recovery rate is 65.56%, and the total radioactivity ratio is 3.35 multiplied by 103Bq/kg, internal radiation index IRa1.5, external irradiation index Ir2.0, meets the requirements of C-class decorative and finishing materials in building material radionuclide limit standard (GB6566-2010), and can be used as C-class decorative and finishing materials.
Example 5
With a total radioactivity ratio of 3.60X 103Bq/kg, internal radiation index IRa1.4, external irradiation index IrThe invention provides a beneficiation method for removing radioactivity of quartz feldspar concentrates, which takes quartz feldspar mixed concentrates with granularity of 2.8, granularity of-0.1 mm accounting for 85% and purity of 96.00% as raw materials, and comprises the following steps:
(1) strong magnetic separation: grinding 1kg of quartz feldspar bulk concentrate with excessive radioactivity, wherein the granularity is-0.1 mm and is more than 85%, then blending the ground fine powder into ore pulp with the concentration of 30%, and then carrying out wet-type strong magnetic separation, wherein the strong magnetic separation comprises a closed-loop process consisting of primary roughing and primary scavenging, the roughing is carried out to obtain roughing concentrate and roughing tailings, the roughing tailings are subjected to primary scavenging to obtain scavenging concentrate and scavenging tailings, the scavenging concentrate is returned to the primary roughing through the closed-loop process, and the scavenging tailings are strong magnetic tailings; the magnetic field intensity of the primary roughing is 3.0T, and the magnetic field intensity of the primary scavenging is 3.5T;
(2) and (3) reselecting the shaking table at a first stage: performing first-stage table reselection on the strong magnetic tailings to obtain first-stage table reselection concentrate and first-stage table reselection tailings;
(3) and (3) reselecting a second-stage shaking table: grinding the tailings reselected by the first-stage shaking table, and grinding the particlesThe degree is reduced to-0.05 mm and is more than 95 percent, the fine powder with the further reduced granularity after ore grinding is blended into ore pulp with the concentration of 30 percent and then is subjected to secondary table concentrator reselection to obtain secondary table concentrator reselection concentrate, secondary table concentrator reselection middling and secondary table concentrator reselection tailings, the secondary table concentrator reselection middling is the quartz feldspar concentrate without radioactivity, the purity of the quartz feldspar concentrate is determined to be 97.12 percent, the recovery rate is 71.45 percent, and the total radioactivity ratio is 2.15 multiplied by 103Bq/kg, internal radiation index IRa1.0, external irradiation index Ir1.8, meets the requirements of class B decorative and finishing materials in building material radionuclide limit standards (GB6566-2010), and can be used as class B decorative and finishing materials.
Example 6
At a total radioactivity ratio of 5.62X 103Bq/kg, internal radiation index IRa1.5, external irradiation index IrThe invention provides a beneficiation method for removing radioactivity of quartz feldspar concentrates, which takes quartz feldspar mixed concentrates with the granularity of 2.7, the granularity of-0.1 mm accounting for 85% and the purity of 95.23% as raw materials, and comprises the following steps:
(1) strong magnetic separation: grinding 1kg of quartz feldspar bulk concentrate with excessive radioactivity, wherein the granularity is-0.1 mm and is more than 85%, then blending the ground fine powder into ore pulp with the concentration of 20%, and then carrying out wet-type strong magnetic separation, wherein the strong magnetic separation comprises a closed-loop process consisting of primary roughing and primary scavenging, the roughing is carried out to obtain roughing concentrate and roughing tailings, the roughing tailings are subjected to primary scavenging to obtain scavenging concentrate and scavenging tailings, the scavenging concentrate is returned to the primary roughing through the closed-loop process, and the scavenging tailings are strong magnetic tailings; the magnetic field intensity of the primary roughing is 2.5T, and the magnetic field intensity of the primary scavenging is 3.0T;
(2) and (3) reselecting the shaking table at a first stage: performing first-stage table reselection on the strong magnetic tailings to obtain first-stage table reselection concentrate and first-stage table reselection tailings;
(3) and (3) reselecting a second-stage shaking table: grinding the first-stage shaking table gravity separation tailings, reducing the granularity to-0.05 mm which is more than 95 percent, blending the fine powder with the further reduced granularity after grinding into ore pulp with the concentration of 30 percent, and then carrying out second-stage shaking table gravity separation to obtain second-stage ore pulpThe method comprises the following steps of concentrated ore reselection by a table concentrator, middling reselection by a second-stage table concentrator and tailings reselection by a second-stage table concentrator, wherein the middling reselection by the second-stage table concentrator is quartz feldspar concentrated ore with radioactivity removed, and the purity of the quartz feldspar concentrated ore is determined to be 97.84%, the recovery rate is 78.25%, and the total radioactivity specific discharge is 2.76 multiplied by 103Bq/kg, internal radiation index IRa1.0, external irradiation index Ir1.2, meets the requirements of class A decorative and finishing materials in building material radionuclide limit standards (GB6566-2010), and can be used as class A decorative and finishing materials.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (1)
1. The beneficiation method for removing the radioactivity of the quartz feldspar concentrates is characterized by comprising the following steps of:
(1) strong magnetic separation: grinding quartz feldspar bulk concentrates with excessive radioactivity, wherein the purity of the quartz feldspar bulk concentrates with excessive radioactivity is more than 90%, the granularity of fine powder after grinding is-0.1 mm and more than 80%, then blending the ground fine powder into ore pulp with the concentration of 10-30%, and then performing wet-type strong magnetic separation, wherein the strong magnetic separation comprises a closed flow consisting of primary roughing and primary scavenging, the roughing concentrates and the roughing tailings are obtained after roughing, the roughing tailings are subjected to primary scavenging to obtain scavenging concentrates and scavenging tailings, the scavenging concentrates are returned to the primary roughing through the closed flow, and the scavenging tailings are strong magnetic tailings; the magnetic field intensity of the primary roughing is 2.0-3.0T, and the magnetic field intensity of the primary scavenging is 2.0-3.5T;
(2) and (3) reselecting the shaking table at a first stage: performing first-stage table reselection on the strong magnetic tailings to obtain first-stage table reselection concentrate and first-stage table reselection tailings;
(3) and (3) reselecting a second-stage shaking table: grinding the first-stage table concentrator reselected tailings, wherein the granularity of ground ore is-0.05 mm and is larger than 80%, blending the ground fine powder into ore pulp with the concentration of 10-30%, and then carrying out second-stage table concentrator reselection to obtain second-stage table concentrator reselected concentrate, second-stage table concentrator reselected middlings and second-stage table concentrator reselected tailings, wherein the second-stage table concentrator reselected middlings are quartz feldspar concentrates with radioactivity removed.
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| CN102836777A (en) * | 2012-09-18 | 2012-12-26 | 镇康县金宏矿业有限公司 | Ore dressing technology for comprehensively recovering lean and fine wiikite |
| CN103447146A (en) * | 2013-09-22 | 2013-12-18 | 北京矿冶研究总院 | Method for recovering feldspar from molybdenum ore tailings |
| CN103962232A (en) * | 2014-05-08 | 2014-08-06 | 广东省工业技术研究院(广州有色金属研究院) | Rare earth ore beneficiation method |
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