A carbon mud inhibitor and an efficient mineral processing method using it.

Abstract

This invention discloses a carbon slime inhibitor and an efficient mineral processing method, comprising the following raw materials: dextrin, guar gum, hydroxyethyl cellulose, and polysorbate 80. The carbon slime removed by this invention has a lower lead and zinc content, resulting in higher lead and zinc recovery rates in the lead-zinc concentrate and better mineral processing indicators. It removes carbon slime that affects lead-zinc flotation while simultaneously reducing lead and zinc losses in the carbon slime.

Description

Technical Field

[0001] This invention relates to a beneficiation method for lead-zinc ore, specifically to an efficient beneficiation method and application for carbon- and muddy lead-zinc ore, belonging to the field of non-ferrous metal ore beneficiation. Background Technology

[0002] Lead and zinc are widely used in all sectors of the national economy and are important strategic metals in my country. In recent years, with the development of the national economy, the demand for lead and zinc has been increasing, while high-quality lead and zinc resources are becoming increasingly scarce. Therefore, the efficient utilization of carbonaceous mud lead and zinc resources, which are difficult to utilize, will become increasingly important.

[0003] Carbonaceous mudstone lead-zinc ores generally have high carbon content. Due to varying degrees of carbonization, the floatability of carbonaceous material differs significantly, and carbonaceous material is closely intergrowthed with valuable minerals and gangue minerals. Furthermore, carbonaceous mudstone lead-zinc ores typically have fine-grained disseminated particles, close mineral symbiosis, and complex structures. The presence of carbonaceous material results in high reagent consumption during lead-zinc flotation, and carbonaceous material easily enters the concentrate, leading to low concentrate grades that fail to meet the requirements for qualified products. The fine particle size of carbonaceous mudstone lead-zinc ores results in extremely fine grinding, and the large amount of easily mud-forming minerals they contain causes mud formation, severely interfering with lead-zinc flotation, leading to unstable beneficiation operations and ultimately unsatisfactory results.

[0004] Currently, the impact of carbonaceous mud on lead-zinc flotation in carbonaceous mud lead-zinc ores is generally eliminated through three methods. First, pre-decarbonization is performed before lead-zinc flotation; that is, before lead-zinc flotation, an appropriate amount of frother or hydrocarbon oil is added to pre-flot the carbonaceous mud. This method can completely eliminate the impact of carbonaceous mud on lead-zinc flotation, resulting in stable flotation indicators, but significant lead and zinc losses occur in the carbonaceous mud. Second, carbon-lead co-flotation is used to obtain a carbon-lead concentrate, and then, based on the difference in floatability between carbonaceous mud and galena, either lead suppression and carbon flotation or carbon suppression and flotation are used for carbon-lead separation. This method avoids the drawback of high lead and zinc loss rates during pre-decarbonization, but it places higher demands on carbon-lead separation operations. Currently, the application of highly efficient and environmentally friendly depressants for carbonaceous mud or galena is limited. Thirdly, carbon suppression is used to directly float lead and zinc. This method also relies entirely on the efficient desiccant of carbon mud. It is more suitable for carbon mud with poor floatability and lead and zinc ores with low carbon content. However, when the carbon mud content is high and the carbon mud has good floatability, the flotation process is unstable and the beneficiation index is not ideal. At present, only the pre-decarbonization method is widely used in the industrial production of lead and zinc ores containing carbon mud. However, the amount of lead and zinc metal lost in the pre-removed carbon mud is large, which not only wastes resources but also reduces the economic benefits of the mine. Summary of the Invention

[0005] This invention addresses the shortcomings of existing pre-decarbonization technologies. One objective of this invention is to provide an efficient beneficiation method for carbonaceous mud lead-zinc ore, so as to effectively remove carbon mud while reducing the loss of lead and zinc metals in the carbon mud, thereby improving the utilization rate of lead and zinc resources and increasing the economic benefits of lead-zinc mines. Another objective of this invention is to provide an application of an efficient carbon mud inhibitor in carbonaceous mud lead-zinc ore.

[0006] The technical solution adopted in this invention is: a carbon mud inhibitor, comprising the following raw materials: dextrin, guar gum, hydroxyethyl cellulose, and polysorbate 80. Carbon mud minerals are mainly carbonaceous gangue and sericite, which are easily mud-like in slurry. In this invention, dextrin, guar gum, hydroxyethyl cellulose, and other molecules are easily adsorbed onto the surface of carbon mud minerals. Due to the large molecular weight of the carbon mud inhibitor and its high hydroxyl content, it exhibits good hydrophilicity. After adsorption onto the surface of carbon mud minerals, the carbon mud inhibitor causes the carbon mud minerals to become hydrophilic, thereby inhibiting the carbon mud minerals. Polysorbate 80 can dissolve foaming agents or hydrocarbon oil molecules adsorbed on the surface of carbon mud minerals in polysorbate 80, thereby reducing the floatability of carbon mud minerals.

[0007] As a further improvement of the present invention, the raw materials are mixed in the following proportions: 50-60 parts dextrin, 25-20 parts guar gum, 20-15 parts hydroxyethyl cellulose, and 5 parts polysorbate 80.

[0008] An efficient mineral processing method includes the following steps:

[0009] S1, grinding carbonaceous mud lead-zinc ore into a slurry;

[0010] S2, add kerosene or diesel to the slurry, adjust the slurry for 2-5 minutes, then add No. 2 oil or MIBC, adjust the slurry for 2-5 minutes, and carry out aerated flotation to obtain carbon mud roughing concentrate and decarbonization roughing tailings. The decarbonization roughing tailings are then decarbonized and scavenged again to obtain decarbonization scavenging concentrate and decarbonization scavenging tailings.

[0011] S3, the carbon mud roughing concentrate and carbon mud scavenging concentrate are combined into carbon mud concentrate, carbon mud inhibitor is added to carbon mud concentrate, the slurry is adjusted for 2-5 minutes, sulfur and nitrogen are added, the slurry is adjusted for 2-5 minutes, and aerated flotation is used to obtain lead roughing concentrate and lead roughing tailings.

[0012] S4. The lead rougher concentrate is cleaned once to obtain lead concentrate 1 and lead middlings; the lead middlings and lead rougher tailings are combined, carbon mud inhibitor is added, the slurry is adjusted for 2-5 minutes, copper sulfate is added, the slurry is adjusted for 2-5 minutes, butyl xanthate is added, the slurry is adjusted for 2-5 minutes, and aerated flotation is performed to obtain zinc rougher concentrate and zinc rougher tailings.

[0013] S5, the zinc rough concentrate is finely treated once to obtain zinc concentrate 1 and zinc middlings. Finally, the zinc middlings and zinc rough tailings are combined and discharged as carbon mud.

[0014] S6, the decarbonized tailings are subjected to lead flotation and zinc flotation, and the lead concentrate 1 and zinc concentrate 1 obtained from the carbon mud concentrate are returned to the lead cleaning operation and the zinc cleaning operation respectively, and finally lead concentrate and zinc concentrate are obtained.

[0015] This invention strengthens the inhibition of carbonaceous minerals by adding carbonaceous mud inhibitors to carbonaceous mud concentrate, facilitating the recovery of lost galena and sphalerite from the concentrate via flotation. This achieves the goal of improving lead and zinc recovery rates under decarbonization conditions, thereby increasing the economic benefits of the mine.

[0016] As a further improvement of the present invention, in step S2, the amount of kerosene or diesel added is 32-150 g / t, and the amount of No. 2 oil or MIBC added is 32-64 g / t.

[0017] As a further improvement of the present invention, in step S3, the amount of carbon mud inhibitor added is 50-200 g / t, and the amount of sulfur and nitrogen added is 10-80 g / t.

[0018] As a further improvement of the present invention, in step S4, the amount of carbon mud inhibitor added is 50-200 g / t, the amount of copper sulfate added is 50-200 g / t, and the amount of butyl xanthate added is 50-100 g / t.

[0019] The beneficial effects of the present invention are: (1) Compared with the existing decarbonization and beneficiation methods for carbon mud lead-zinc ore, the carbon mud removed by the present invention has a lower lead and zinc content, a higher lead and zinc recovery rate in the lead-zinc concentrate, and better beneficiation indicators. It removes the carbon mud that affects lead and zinc flotation and reduces the loss of lead and zinc in the carbon mud.

[0020] (2) The carbon mud inhibitor used in this invention has a wide range of raw material sources, is inexpensive, and is easy to apply on a large scale. Attached Figure Description

[0021] Figure 1 This is a process flow diagram of the efficient mineral processing method of the present invention.

[0022] Figure 2 This is a process flow diagram of decarbonization and lead and zinc recovery from carbon mud according to Embodiment 1 of the present invention.

[0023] Figure 3 This is the process flow diagram for Comparative Example 1.

[0024] Figure 4 This is the process flow diagram for Comparative Example 2. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1

[0027] This invention provides a mineral processing method for decarbonization and lead-zinc recovery from a carbonaceous mud lead-zinc ore deposit in Canada.

[0028] A carbonaceous mudstone lead-zinc ore in Canada contains 1.70% Pb, 10.78% Zn, 2.48% total carbon, and 1.48% organic carbon. The ore also contains 7.5% easily mud-forming sericite. This is a typical carbonaceous, mud-bearing lead-zinc ore. The following beneficiation method was used.

[0029] The lead-zinc ore is ground into a slurry with 90% of the particles being -0.074mm.

[0030] Add 32g / t of diesel oil to the slurry and condition for 2-5 minutes. Add 32g / t of MIBC and condition for 2-5 minutes. Aerated flotation yields carbon mud rough concentrate and carbon mud rough tailings, which are then scavenged to obtain carbon mud scavenged concentrate and carbon mud scavenged tailings.

[0031] The carbon mud rough concentrate and carbon mud scavenging concentrate are combined into carbon mud concentrate, and 120 g / t of carbon mud inhibitor and 60 g / t of sulfur and nitrogen are added to it. After stirring, lead rough concentrate and lead rough tailings are obtained by flotation.

[0032] Lead rough concentrate is subjected to primary beneficiation to obtain lead concentrate 1 and lead middlings. The lead middlings and lead rough tailings are combined, and 100 g / t of carbon mud inhibitor is added. After stirring, flotation is performed to obtain zinc rough concentrate and zinc rough tailings.

[0033] The zinc rougher concentrate undergoes a single cleaning operation to obtain zinc concentrate 1 and zinc middlings. Finally, the zinc rougher tailings and zinc middlings are combined and discharged as carbon sludge.

[0034] The carbon scavenging tailings are subjected to lead flotation and zinc flotation, and lead concentrate 1 and zinc concentrate 1 are returned to the lead cleaning operation and zinc cleaning operation, respectively.

[0035] Table 1

[0036]

[0037] Comparative Example 1

[0038] An experimental study was conducted on a carbonaceous lead-zinc ore mine in Canada using conventional pre-decarbonization methods.

[0039] A carbonaceous mud lead-zinc ore in Canada contains 1.70% Pb, 10.78% Zn, 2.48% total carbon, 1.48% organic carbon, and 7.5% easily mud-forming sericite.

[0040] The lead-zinc ore is ground into a slurry with 90% of the particles being -0.074mm.

[0041] Add 32g / t of diesel oil to the slurry and condition for 2-5 minutes. Then add 32g / t of MIBC and condition for 2-5 minutes. Aerated flotation yields carbon mud rough concentrate and carbon mud rougher tailings, which are then scavenged to obtain carbon mud scavenged concentrate and carbon mud scavenged tailings. The carbon mud rough concentrate and carbon mud scavenged concentrate are combined into a single carbon mud concentrate for discharge.

[0042] Lead and zinc concentrates are obtained by carrying out lead flotation and zinc flotation operations on carbon mud tailings.

[0043] Table 2

[0044]

[0045] Comparing the data in Tables 1 and 2, it can be seen that, compared with conventional pre-decarbonization processes, the present invention, by adding carbon sludge inhibitors, sulfur and nitrogen, and butyl xanthate to the decarbonized sludge, can recover the lead and zinc metals lost in the carbon sludge, significantly improving the lead and zinc metal recovery rate.

[0046] Comparative Example 2

[0047] A pilot study was conducted on the decarbonization and lead-zinc recovery of a carbonaceous mud lead-zinc ore in Canada using conventional pre-decarbonization beneficiation methods.

[0048] A carbonaceous mud lead-zinc ore in Canada contains 1.70% Pb, 10.78% Zn, 2.48% total carbon, 1.48% organic carbon, and 7.5% easily mud-forming sericite.

[0049] The lead-zinc ore is ground into a slurry with 90% of the particles being -0.074mm.

[0050] Add 32g / t of diesel oil to the slurry and condition for 2-5 minutes. Add 32g / t of MIBC and condition for 2-5 minutes. Aerated flotation yields carbon mud rough concentrate and carbon mud rough tailings, which are then scavenged to obtain carbon mud scavenged concentrate and carbon mud scavenged tailings.

[0051] The carbon mud rough concentrate and carbon mud scavenging concentrate are combined into carbon mud concentrate, and 400 g / t of chromium iron lignin sulfonate and 60 g / t of sulfur and nitrogen are added to it. After stirring, lead rough concentrate and lead rough tailings are obtained by flotation.

[0052] Lead concentrate is subjected to a primary beneficiation process to obtain lead concentrate 1 and lead middlings. The lead middlings and lead roughing tailings are combined, and 300 g / t of chromium ferrolignin sulfonate is added. After stirring, flotation is performed to obtain zinc concentrate and zinc roughing tailings.

[0053] The zinc rougher concentrate undergoes a single cleaning operation to obtain zinc concentrate 1 and zinc middlings. Finally, the zinc rougher tailings and zinc middlings are combined and discharged as carbon sludge.

[0054] The carbon scavenging tailings are subjected to lead flotation and zinc flotation, and lead concentrate 1 and zinc concentrate 1 are returned to the lead beneficiation operation and the zinc concentrate operation, respectively.

[0055] Table 3

[0056]

[0057] Comparing the data in Tables 1 and 3, it can be seen that the carbon mud inhibitor using the method of the present invention has a stronger inhibitory effect on carbon mud and a better selective effect compared with conventional carbon mud inhibitors. It can significantly reduce the loss rate of lead and zinc metals in carbon mud and improve the lead and zinc metal recovery rate in concentrate.

[0058] Those skilled in the art should understand that the protection scheme of the present invention is not limited to the above embodiments, and various arrangements, combinations and transformations can be made on the basis of the above embodiments. Without departing from the spirit of the present invention, all transformations made to the present invention fall within the protection scope of the present invention.

Claims

1. A highly efficient mineral processing method utilizing carbon mud inhibitors, comprising the following steps: S1, grinding carbonaceous mud lead-zinc ore into a slurry; S2, add kerosene or diesel to the slurry, adjust the slurry for 2-5 minutes, then add No. 2 oil or MIBC, adjust the slurry for 2-5 minutes, and carry out aerated flotation to obtain carbon mud roughing concentrate and decarbonization roughing tailings. The decarbonization roughing tailings are then decarbonized and scavenged again to obtain decarbonization scavenging concentrate and decarbonization scavenging tailings. S3, the carbon mud roughing concentrate and carbon mud scavenging concentrate are combined into carbon mud concentrate, carbon mud inhibitor is added to carbon mud concentrate, the slurry is adjusted for 2-5 minutes, sulfur and nitrogen are added, the slurry is adjusted for 2-5 minutes, and aerated flotation is used to obtain lead roughing concentrate and lead roughing tailings. S4. The lead rougher concentrate is cleaned once to obtain lead concentrate 1 and lead middlings; the lead middlings and lead rougher tailings are combined, carbon mud inhibitor is added, the slurry is adjusted for 2-5 minutes, copper sulfate is added, the slurry is adjusted for 2-5 minutes, butyl xanthate is added, the slurry is adjusted for 2-5 minutes, and aerated flotation is performed to obtain zinc rougher concentrate and zinc rougher tailings. S5, the zinc rough concentrate is finely treated once to obtain zinc concentrate 1 and zinc middlings. Finally, the zinc middlings and zinc rough tailings are combined and discharged as carbon mud. S6, the decarbonized tailings are subjected to lead flotation and zinc flotation, and the lead concentrate 1 and zinc concentrate 1 obtained from the carbon mud concentrate are returned to the lead cleaning operation and the zinc cleaning operation respectively, and finally lead concentrate and zinc concentrate are obtained; The carbon mud inhibitor is prepared by mixing the following proportions: 50-60 parts dextrin, 25-20 parts guar gum, 20-15 parts hydroxyethyl cellulose, and 5 parts polysorbate 80.

2. The efficient mineral processing method according to claim 1, characterized in that: In step S2, the amount of kerosene or diesel added is 32-150 g / t, and the amount of No. 2 oil or MIBC added is 32-64 g / t.

3. The efficient mineral processing method according to claim 1, characterized in that: In step S3, the amount of carbon mud inhibitor added is 50~200g / t, and the amount of sulfur and nitrogen added is 10~80g / t.

4. The efficient mineral processing method according to claim 1, characterized in that: In step S4, the amount of carbon mud inhibitor added is 50~200g / t, the amount of copper sulfate added is 50~200g / t, and the amount of butyl xanthate added is 50~100g / t.

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