Method for extracting quartz concentrate from lead-zinc mining waste rock

Abstract

The invention discloses a method for extracting quartz concentrate from lead-zinc mining waste rock. The method comprises the following steps: carrying out ore grinding treatment on the lead-zinc mining waste rock to obtain an ore grinding product; pumping the obtained ore grinding product into a cyclone for grading, and removing fine silt of-45 microns to obtain coarse quartz mortar and fine silt; preparing ore pulp of the coarse quartz mortar, adding an activating agent, a sulfide collecting agent and a foaming agent, uniformly stirring, and removing impurities to obtain sulfide minerals and primary flotation tailings; the pH value of the first flotation tailings is adjusted, then a combined iron collecting agent is added for impurity removal, and iron-containing impurities and second flotation tailings are obtained; the pH value of the second-time flotation tailings is adjusted, then a collecting agent is added for impurity removal, and third-time flotation tailings are obtained; and performing high-intensity magnetic separation to remove impurities, and performing magnetic separation for multiple times by using a high-gradient magnetic separator to remove magnetic substances to obtain quartz concentrate. According to the technical scheme, quartz concentrate can be obtained, the comprehensive utilization rate of mining waste rocks is increased, and the economic value is improved.

Description

Technical Field

[0001] The invention relates to the technical field of comprehensive utilization of mining waste rock and quartz ore dressing, and in particular to a method for extracting quartz concentrate from lead-zinc mining waste rock. Background Art

[0002] Quartz is one of the most widely distributed minerals on the earth's surface. Its physical and chemical properties are very stable, and it has the advantages of high temperature resistance, corrosion resistance, high light transmittance, and high insulation. Therefore, quartz is widely used in glass, metallurgy, construction, chemical industry, plastics, rubber, electronic information, semiconductors, optoelectronics, aerospace and other fields. Quartz is widely distributed in nature and has various causes. At present, the main types of quartz mineral resources are natural crystal, vein quartz, granite pegmatite quartz, quartzite, quartz sandstone, powder quartz, natural quartz, quartz conglomerate, etc.

[0003] Waste rock refers to the surrounding rock and gangue without industrial value that are stripped during the ore mining process. With the continuous development of lead and zinc mineral resources, the amount of lead and zinc mining waste rock generated has continued to increase. The open-air storage mode currently used not only harms the ecological environment but also causes waste of other valuable resources. Quartz is a common valuable mineral in lead and zinc mining waste rock, and its SiO2 content is generally between 50% and 90%. With the rapid development of industries such as construction, photovoltaics, and optical fibers in recent years, the status of high-purity quartz products in the new materials industry has become increasingly prominent, and the demand for high-quality quartz products has also increased. Therefore, it is particularly necessary to comprehensively recycle quartz in lead and zinc mining waste rock.

[0004] At present, the utilization of mining waste rock is mostly for direct preparation of building materials, and there are few reports on the extraction of quartz concentrate. On the one hand, the preparation of building materials is more direct and efficient. For example, Wu Jianxin et al. disclosed a comprehensive utilization method for vein quartz mining waste rock. Through the combined process of "pre-screening + two-stage crushing + water washing / screening", two types of stone with particle sizes of 5-10mm and 10-30mm were obtained. The washed screen material was produced by a sand and gravel washing machine to obtain 1-5mm building stone. All three products are used for the production of environmentally friendly and energy-saving building materials. On the other hand, the metal impurity content in metal mine waste rock generally exceeds the standard, which makes it difficult to apply it to the glass industry, let alone as a raw material for the extraction of high-purity quartz.

[0005] Affected by various factors such as geographical location restrictions and surrounding building materials market demand, the production of low-value building materials raw materials often cannot bring benefits to mining companies, and may even be processed at a loss. In order to seek a higher-value processing method, the present invention proposes a method for extracting high-quality quartz from lead-zinc mining waste rock, which converts the lead-zinc mining waste rock into quartz concentrate that meets the raw material needs of refractory materials, flat glass and high-purity quartz production. Summary of the invention

[0006] In view of the problems of insufficient comprehensive utilization rate and low market value of existing lead-zinc mining waste rock resources, the present invention provides a method for extracting quartz concentrate from lead-zinc mining waste rock. The method solves the problem that a large amount of quartz minerals in lead-zinc mining waste rock are difficult to apply to high-value industries such as refractory materials and glass manufacturing, and improves the comprehensive utilization rate of lead-zinc mining waste rock.

[0007] To achieve the above object, the technical solution of the present invention is: a method for extracting quartz concentrate from lead-zinc mining waste rock, the method specifically comprising the following steps:

[0008] S1) crushing the lead-zinc mining waste rock to less than 15 mm and then conveying it to a rod mill or a forging mill for grinding to obtain a grinding product;

[0009] S2) pumping the ground product obtained in S1) into a cyclone for classification, removing -45 μm fine mud, and obtaining coarse quartz mortar and fine mud;

[0010] S3) adding a modulator to the crude quartz mortar obtained in S2) to prepare a slurry of a certain concentration, then adding a certain amount of an activator, a sulfide collector and a frother, stirring evenly, and performing a first flotation to remove impurities to obtain sulfide minerals and a first flotation tailings;

[0011] S4) adjusting the pH value of the slurry to 4-6 using sulfuric acid as a pH adjuster for the first flotation tailings obtained in S3), adding a certain amount of a combined iron collector and stirring evenly, and then performing a second flotation to remove impurities, thereby obtaining iron-containing impurities and a second flotation tailings;

[0012] S5) adding sulfuric acid to the second flotation tailings again to adjust the pH value of the pulp to 2-3, adding a certain amount of collector and stirring evenly, and then performing a third flotation to remove impurities to obtain a third flotation tailings;

[0013] S6) The third flotation tailings are subjected to strong magnetic separation to remove impurities. The strong magnetic separation uses a high gradient magnetic separator to perform multiple magnetic separations to remove magnetic substances and obtain quartz concentrate.

[0014] Further, the grinding treatment time in S1) is 10 to 30 minutes;

[0015] The grinding product has a fineness of -150 μm accounting for 50% to 85%.

[0016] Furthermore, the modulator in S3) is water, and the slurry concentration is adjusted to 25% to 55%;

[0017] The weight ratio of the activator to the slurry is:

[0018] The weight ratio of the sulfide ore collector to the ore pulp is 1 to 20:100000;

[0019] The weight ratio of the foaming agent to the ore pulp is 1 to 10:100000;

[0020] The stirring time is 1 to 5 minutes;

[0021] The flotation and impurity removal operation time is 4 to 10 minutes.

[0022] Further, the activator is one or more of copper sulfate, lead nitrate, and sodium sulfide;

[0023] The sulfide ore collector is one or more of alkyl sodium xanthate, alkyl potassium xanthate, butyl ammonium black medicine, and ethyl thiocyanate;

[0024] The foaming agent is pine oil.

[0025] Further, the weight ratio of the combined iron collector to the ore pulp in S4) is 5 to 40:100000;

[0026] The stirring time is 1 to 5 minutes;

[0027] The flotation and impurity removal operation time is 4 to 10 minutes.

[0028] Furthermore, the combined iron collector comprises sodium petroleum sulfonate, oleic acid, octanol and pine oil, and the mass ratio of sodium petroleum sulfonate, oleic acid, octanol and pine oil is (3-6):(1-3):(1-3):(0.2-1).

[0029] Further, the weight ratio of the third flotation collector in S5) to the slurry is 3 to 20:100000;

[0030] The third flotation collector is modified dodecylamine;

[0031] The stirring time is 1 to 5 minutes;

[0032] The flotation and impurity removal operation time is 4 to 10 minutes.

[0033] Furthermore, the magnetic field intensity during the strong magnetic removal of magnetic minerals in S6) is 0.8T to 1.6T; the second magnetic separation intensity is at least 10% higher than the first magnetic separation intensity, and the third magnetic separation intensity is at least 10% higher than the second magnetic separation intensity.

[0034] Furthermore, the method obtains a quartz concentrate having a SiO2 grade of not less than 99.00%, an Al2O3 content of not more than 0.7%, and a Fe2O3 content of not more than 0.15%.

[0035] A quartz concentrate is prepared by the method.

[0036] Compared with the prior art, the beneficial effects of this application include:

[0037] By applying the technical scheme of the present invention, in view of the complex types and properties of minerals in lead-zinc mining waste rock, especially the complex existence forms and multiple types of iron-containing minerals that affect the quality of quartz sand, a combined recovery process of grinding, classification, flotation, magnetic separation and the like is adopted, in combination with an activator and collector for sulfide minerals, a combined iron collector for iron-containing minerals and fluorite minerals, and a modified dodecylamine collector for aluminum-containing minerals, so as to remove sulfide ores, iron oxides or iron silicates, fluorite, mica, kaolin, chlorite, feldspar, magnetic substances and other impurity minerals that affect the quality of quartz concentrate in the lead-zinc mining waste rock in stages, thereby obtaining high-quality quartz sand concentrate, thereby improving the comprehensive utilization value of the waste rock. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The present invention is a flowchart of a method for extracting quartz concentrate from lead-zinc mining waste rock. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] The embodiment of the present invention solves the problem of the difficulty in comprehensive utilization of lead-zinc mining waste rock through the combined process of "grinding and grinding + classification desliming + reverse flotation removal + strong magnetic separation". The embodiment of the present invention will be further described below in conjunction with the accompanying drawings.

[0041] See also Figure 1 The present invention provides a method for extracting quartz concentrate from lead-zinc mining waste rock, the method specifically comprising the following steps:

[0042] S1) crushing the lead-zinc mining waste rock to less than 15 mm and then conveying it to a rod mill or a forging mill for grinding to obtain a grinding product;

[0043] S2) pumping the ground product obtained in S1) into a cyclone for classification, removing -45 μm fine mud, and obtaining coarse quartz mortar and fine mud;

[0044] S3) adding a modulator to the crude quartz mortar obtained in S2) to prepare a slurry of a certain concentration, then adding a certain amount of an activator, a sulfide collector and a frother, stirring evenly, and performing a first flotation to remove impurities to obtain sulfide minerals and a first flotation tailings;

[0045] S4) adjusting the pH value of the slurry to 4-6 using sulfuric acid as a pH adjuster for the first flotation tailings obtained in S3), adding a certain amount of a combined iron collector and stirring evenly, and then performing a second flotation to remove impurities, thereby obtaining iron-containing impurities and a second flotation tailings;

[0046] S5) adding sulfuric acid to the second flotation tailings again to adjust the pH value of the pulp to 2-3, adding a certain amount of collector and stirring evenly, and then performing a third flotation to remove impurities, remove aluminum impurities, and obtain a third flotation tailings;

[0047] S6) The third flotation tailings are subjected to strong magnetic separation to remove impurities. The strong magnetic separation uses a high gradient magnetic separator to perform multiple magnetic separations to remove magnetic substances and obtain quartz concentrate.

[0048] Further, the grinding treatment time in S1) is 10 to 30 minutes;

[0049] The grinding product has a fineness of -150 μm accounting for 50% to 85%.

[0050] Furthermore, the modulator in S3) is water, and the slurry concentration is adjusted to 25% to 55%;

[0051] The weight ratio of the activator to the slurry is:

[0052] The weight ratio of the sulfide ore collector to the ore pulp is 1 to 20:100000;

[0053] The weight ratio of the foaming agent to the ore pulp is 1 to 10:100000;

[0054] The stirring time is 1 to 5 minutes;

[0055] The flotation and impurity removal operation time is 4 to 10 minutes.

[0056] Further, the activator is one or more of copper sulfate, lead nitrate, and sodium sulfide;

[0057] The sulfide ore collector is one or more of alkyl sodium xanthate, alkyl potassium xanthate, butyl ammonium black medicine, and ethyl thiocyanate;

[0058] The foaming agent is pine oil.

[0059] Further, the weight ratio of the combined iron collector to the ore pulp in S4) is 5-40:100000;

[0060] The stirring time is 1 to 5 minutes;

[0061] The flotation and impurity removal operation time is 4 to 10 minutes.

[0062] Furthermore, the combined iron collector comprises sodium petroleum sulfonate, oleic acid, octanol and pine oil, and the mass ratio of sodium petroleum sulfonate, oleic acid, octanol and pine oil is (3-6):(1-3):(1-3):(0.2-1).

[0063] Further, the weight ratio of the third flotation collector in S5) to the slurry is 3 to 20:100000;

[0064] The third flotation collector is modified dodecylamine;

[0065] The stirring time is 1 to 5 minutes;

[0066] The flotation and impurity removal operation time is 4 to 10 minutes.

[0067] Furthermore, the magnetic field intensity during the strong magnetic removal of magnetic minerals in S6) is 0.8T to 1.6T; the second magnetic separation intensity is at least 10% higher than the first magnetic separation intensity, and the third magnetic separation intensity is at least 10% higher than the second magnetic separation intensity.

[0068] Furthermore, the method obtains a quartz concentrate having a SiO2 grade of not less than 99.10%, an Al2O3 content of not more than 0.61%, and a Fe2O3 content of not more than 0.15%.

[0069] A quartz concentrate is prepared by the method.

[0070] The sulfide minerals include one or more of the following: pyrite, chalcopyrite, galena, sphalerite, pyrrhotite, molybdenite and stibnite.

[0071] The iron-containing impurities include one or more of the following: goethite, siderite, hematite, kyanite, garnet, magnetite, ilmenite, limonite, beryl, fluorite and andalusite.

[0072] The aluminum-containing impurities include one or more of the following: feldspar, mica, kaolin, zeolite, garnet, dolomite, serpentine, amphibole, talc and illite.

[0073] The magnetic minerals subjected to high gradient magnetic separation include one or more of the following: pyrite, chalcopyrite, mica, chlorite, nickel-cobalt ore, ilmenite, siderite and hematite.

[0074] Take the mining waste rock of an open-pit lead-zinc mine in Jiangxi as an example. The waste rock of the mine is mainly quartzite and sandstone. The current stripping ratio is 3:1, and more than 1.1 million tons of waste rock are stripped each year. The average SiO2 content in the waste rock reaches 90%. The mining waste rock adopts the process of "grinding + grinding + cyclone desludging + flotation desulfurization + reverse flotation impurity removal + two-stage strong magnetic separation" to obtain the indicators shown in the following table.

[0075]

[0076] It can be seen from the above table that by adopting the process flow described in the above embodiment, a quartz concentrate with a comprehensive yield of 58.01%, a SiO2 grade of 99.10%, an Al2O3 content of 0.61%, and a Fe2O3 content of 0.15% can be obtained, which meets the quartz sand standard for grade I-3 flat glass specified in the industry standard (JC / T529-2000).

[0077] The above is a detailed introduction to a method for extracting quartz concentrate from lead-zinc mining waste rock provided in the embodiment of the present application. The description of the above embodiment is only used to help understand the method and its core idea of ​​the present application; at the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present application.

[0078] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" and "comprising" are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description of the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be subject to that defined in the attached claims.

[0079] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0080] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0081] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be included in the claims attached to the present application.

Claims

1. A method for extracting quartz concentrate from lead-zinc mining waste rock, characterized in that: The method specifically comprises the following steps: S1) crushing the lead-zinc mining waste rock to less than 15 mm and then conveying it to a rod mill or a forging mill for grinding to obtain a grinding product; S2) pumping the ground product obtained in S1) into a cyclone for classification, removing -45 μm fine mud, and obtaining coarse quartz mortar and fine mud; S3) adding a modulator to the crude quartz mortar obtained in S2) to prepare a slurry of a certain concentration, then adding a certain amount of an activator, a sulfide collector and a frother, stirring evenly, and performing a first flotation to remove impurities to obtain sulfide minerals and a first flotation tailings; S4) adjusting the pH value of the slurry to 4-6 using sulfuric acid as a pH adjuster for the first flotation tailings obtained in S3), adding a certain amount of a combined iron collector and stirring evenly, and then performing a second flotation to remove impurities, thereby obtaining iron-containing impurities and a second flotation tailings; S5) adding sulfuric acid to the second flotation tailings again to adjust the pH value of the pulp to 2-3, adding a certain amount of collector and stirring evenly, and then performing a third flotation to remove impurities to obtain a third flotation tailings; S6) The third flotation tailings are subjected to strong magnetic separation to remove impurities. The strong magnetic separation uses a high gradient magnetic separator to perform multiple magnetic separations to remove magnetic substances and obtain quartz concentrate.

2. The method according to claim 1, characterized in that The grinding treatment time in S1) is 10 to 30 minutes; The grinding product has a fineness of -150 μm accounting for 50% to 85%.

3. The method according to claim 1, characterized in that The modulator in S3) is water, and the slurry concentration is adjusted to 25% to 55%; The weight ratio of the activator to the slurry is: The weight ratio of the sulfide ore collector to the ore pulp is 1 to 20:100000; The weight ratio of the foaming agent to the ore pulp is 1 to 10:100000; The stirring time is 1 to 5 minutes; The flotation and impurity removal operation time is 4 to 10 minutes.

4. The method according to claim 3, characterized in that The activator is one or more of copper sulfate, lead nitrate and sodium sulfide; The sulfide ore collector is one or more of alkyl sodium xanthate, alkyl potassium xanthate, butyl ammonium black medicine, and ethyl thiocyanate; The foaming agent is pine oil.

5. The method according to claim 1, characterized in that The weight ratio of the combined iron collector to the ore pulp in S4) is 5-40:100000; The stirring time is 1 to 5 minutes; The flotation and impurity removal operation time is 4 to 10 minutes.

6. The method according to claim 5, characterized in that The combined iron collector comprises sodium petroleum sulfonate, oleic acid, octanol and pine oil, and the mass ratio of the sodium petroleum sulfonate, oleic acid, octanol and pine oil is (3-6):(1-3):(1-3):(0.2-1).

7. The method according to claim 1, characterized in that The weight ratio of the third flotation collector in S5) to the slurry is 3 to 20:100000; The third flotation collector is modified dodecylamine; The stirring time is 1 to 5 minutes; The flotation and impurity removal operation time is 4 to 10 minutes.

8. The method according to claim 1, characterized in that The number of magnetic separations in S6) is 2-3 times; The magnetic field intensity during strong magnetic removal of magnetic minerals is 0.8T to 1.6T; the second magnetic separation intensity is at least 10% higher than the first magnetic separation intensity, and the third magnetic separation intensity is at least 10% higher than the second magnetic separation intensity.

9. The method according to claim 1, characterized in that: The method obtains a quartz concentrate with a SiO2 grade of not less than 99.00%, an Al2O3 content of not more than 0.7%, and a Fe2O3 content of not more than 0.15%.

10. A quartz concentrate, characterized in that: The quartz concentrate is prepared by the method according to any one of claims 1 to 9.

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