Application of lead sulfide collector in complex multi-metallic mixed mineral flotation

Abstract

The application belongs to the technical field of dressing reagent research and development, and particularly relates to application of a lead sulfide collector in flotation of complex polymetallic mixed minerals, and a preparation method of the lead sulfide collector is performed according to the following steps: (1) weighing dimethoate, and grinding to below 0.074 mm; (2) placing the ground dimethoate into a stirrer, keeping stirring, and adding water into the stirrer at a proportion of 1:49 by weight; (3) continuously stirring for 30 minutes until the raw materials are fully dissolved, so as to obtain the lead sulfide collector; the dimethoate (Dimethoate) has a chemical name of O,O-dimethyl-S-(N-methyl carbamoyl methyl) dithiophosphate, a molecular formula of C5H 12 NO3PS2. The lead sulfide collector provided by the application realizes efficient recovery of lead sulfide ore, provides a new technology for separating complex polymetallic mixed minerals, and provides a brand-new design direction for use of a new collector.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of development of beneficiation reagents, and particularly relates to application of a lead sulfide collector in flotation of complex polymetallic mixed minerals. BACKGROUND

[0002] Galena is a common sulfide ore in complex polymetallic deposits, and is often associated with zinc, iron, silver, antimony, copper and other elements, and is an important ore mineral for lead refining and the most widely distributed lead mineral. China has refined lead from galena since the Shang Dynasty. Jamesonite is a typical complex aggregate of lead, antimony, iron and sulfur minerals, and jamesonite is rarely formed alone and is often associated with galena, stibnite, pyrite, pyrrhotite, marmatite, arsenopyrite and silver glance. Flotation is the main enrichment method for galena and jamesonite. Therefore, a new type of high-efficiency and environmentally-friendly lead sulfide collector has become the top priority for researchers in the beneficiation industry.

[0003] At present, there are various types of flotation collectors for lead sulfide ores, mainly including xanthate, black drug, sulfur-nitrogen and some lipid collectors. Although traditional collectors can bring good collection effect, they are not suitable for all flotation conditions. For example, in the case of single mineral flotation and the presence of multiple minerals, some traditional collectors can also have collection effect on minerals other than the target mineral, making it difficult to obtain good mineral separation indicators. As the most common lead sulfide collector, xanthate has the advantages of strong collection ability, good water solubility, easy synthesis and low cost. However, xanthate has the disadvantages of toxicity, easy decomposition, irritating odor and poor selectivity. The selectivity of black drug is better than that of xanthate, and the stability is also better than that of xanthate, and it also has certain foaming property. However, black drug is toxic, has an irritating odor and is corrosive. The collection ability of sulfur-nitrogen collectors is better than that of xanthate, and the selectivity is also better than that of xanthate, but the price is relatively high, and it is easy to decompose under acidic conditions. Sulfur amine ester collectors also have the disadvantages of high price and low solubility. Therefore, the development of new reagents and the combination of reagents is the trend of the development of flotation reagents, which has good collection ability and selectivity for single minerals, and good environmental performance, which is the development goal of the collector. SUMMARY

[0004] In view of the deficiencies of the prior art, the application provides application of a lead sulfide collector in flotation of complex polymetallic mixed minerals, which can solve the problems of poor selectivity, low flotation efficiency, high economic cost and serious pollution of existing collectors, and can realize efficient recovery of lead sulfide ore, provide new technology for separating complex polymetallic mixed minerals, and provide a new design direction for the use of new collectors.

[0005] The technical scheme of the application is: application of a lead sulfide collector in flotation of complex polymetallic mixed minerals, comprising:

[0006] Step one, the preparation of the lead sulfide collector, is carried out according to the following steps:

[0007] (1) Weigh the dimethoate and grind it to a thickness of less than 0.074 mm;

[0008] (2) Place the ground dimethoate into a mixer, keep stirring and add water to the mixer at a weight ratio of 1:49.

[0009] (3) Stir continuously for 30 minutes until the raw materials are fully dissolved to obtain the lead sulfide collector;

[0010] The aforementioned dimethoate, chemically named O,O-dimethyl-S-(N-methylcarbamoylmethyl)dithiophosphate, has the molecular formula C5H. 12 NO3PS2,

[0011] Step two, the application of lead sulfide collectors in the flotation of complex polymetallic mixed minerals, includes the following steps:

[0012] (1) After the pyrrhotite is selected, the mineral is put into the flotation tank and water is added and stirred to make the mass concentration of the slurry 25%;

[0013] (2) Take sodium sulfite inhibitor at a rate of 0.8 kg-1 kg per ton of ore, take zinc sulfate inhibitor at a rate of 0.4 kg-0.6 kg per ton of ore and add the inhibitors to the ore slurry to be processed. Take methyl isobutyl methanol frother at a rate of 0.02 kg per ton of ore and add the inhibitors to the ore slurry to be processed. Take the above lead sulfide collector at a rate of 0.02 kg-0.03 kg per ton of ore and add the lead sulfide collector solution to the ore slurry to be processed for flotation. The roughing time is 4 minutes.

[0014] (3) Take the above lead sulfide collector at a dosage of 5g-10g per ton of ore, add the lead sulfide collector solution to the roughing slurry for two scavenging processes, with each scavenging time being 2 minutes.

[0015] (4) Take sodium sulfite at 0.4kg-0.5kg per ton of ore and zinc sulfate at 0.2kg-0.3kg per ton of ore. Add the inhibitor to the concentrate slurry from the roughing and scavenging processes and perform two cleaning processes, each with a cleaning time of 2.5 minutes.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) It has good selectivity and strong collecting ability. Compared with traditional lead sulfide collectors, it increases lead concentrate grade by 2.3%-3.5% and recovery rate by 2.42%-6.57%.

[0018] (2) It is low in cost, safe and environmentally friendly. Compared with traditional lead sulfide collectors, it is cheaper and requires less dosage. It is also easy to hydrolyze in alkaline solution, and the residual amount in wastewater is small.

[0019] (3) The prepared lead collector is very stable and does not easily fail. It can be stored for 1-3 years under normal storage conditions. It is a white crystalline powder and is easy to transport and store. Detailed Implementation

[0020] The technical solution of the present invention will be further described below through embodiments.

[0021] Example 1

[0022] This embodiment is an example of the preparation method of the lead sulfide collector of the present invention, which includes the following steps: the raw material components are: 100 parts by weight of dimethoate, and the total weight of the raw materials is 100 parts.

[0023] (1) Weigh the raw materials according to the above proportions and grind them to below 0.074 mm;

[0024] (2) Place the ground raw material into a mixer, keep stirring and add water to the mixer at a weight ratio of 1:49;

[0025] (3) Stir continuously for 30 minutes until the raw materials are fully dissolved to obtain the lead sulfide collector.

[0026] Example 2

[0027] This embodiment illustrates the application of the lead sulfide collector described in this invention in the flotation of complex polymetallic mixed minerals.

[0028] The mineral raw material is a brittle lead-antimony sulfide ore from Guangxi. The main metallic elements in this ore are Pb, Sb, Zn, Sn, Fe, and Ag. The specific contents of each component are: lead 2.16%, antimony 2.05%, zinc 8.2%, tin 1.82%, iron 31%, and silver 65 g / t. The non-metallic elements with relatively high content in the ore are S, CaO, and SiO2, with contents of sulfur 26%, calcium oxide 10.5%, and silicon dioxide 4.2%, respectively. The relatively high contents of lead, zinc, sulfur, and iron in the ore indicate that it is a typical lead-zinc sulfide ore. The ore also contains trace elements such as C, MgO, Cu, As, K2O, Cd, Al, Ti, F, Sr, and Bi. The main sulfide minerals in the ore are brittle stibnite, (iron) sphalerite, pyrite, and pyrrhotite, while the main oxide minerals are cassiterite and hematite. The main gangue minerals are quartz, mica, and carbonate minerals. After crushing, the ore is ground using ball mills and rod mills. The ground minerals are then magnetically separated to obtain pyrrhotite concentrate. The magnetically separated minerals are then subjected to lead-antimony flotation, followed by zinc-sulfur co-flotation. The zinc-sulfur concentrate is then separated from the zinc, and finally, the zinc-sulfur concentrate is subjected to gravity separation using a shaking table to obtain tin concentrate. The specific operating steps are as follows:

[0029] (1) Take 200g of the magnetically separated minerals and mix them with 800ml of water. Place the mixture in a 1L hanging tank flotation machine for lead-antimony flotation.

[0030] (2) Add 1 kg / t of sodium sulfite and 500 g / t of zinc sulfate to the ore slurry to be processed, and stir for 2 minutes.

[0031] (3) Take 20 g / t of frother methyl isobutyl methanol and 20 g / t of the lead sulfide collector, add them to the slurry to be processed and stir for 1 minute. The roughing time is 4 minutes.

[0032] (4) Take 8g / t of the lead sulfide collector and add it to the roughing pulp and stir for 1 minute. Perform two scavenging processes.

[0033] (5) Take 400 kg / t of sodium sulfite and 200 g / t of zinc sulfate and add them to the roughing and scavenging concentrate for fine cleaning. The fine cleaning time is 2.5 minutes.

[0034] (6) Collect concentrate and tailings products, filter, dry and weigh them.

[0035] Under the same conditions, 30 g / t of black powder was added for comparison. The lead content and lead recovery rate in the obtained lead concentrate are shown in Table 1.

[0036] Table 1 Results of Lead-Antimony Flotation Test

[0037]

[0038] As shown in Table 1, by comparing the test data of black reagent and the lead sulfide collector of the present invention, it can be found that when using the lead sulfide collector of the present invention, the lead grade in lead concentrate increased by 2.3%, the lead grade in tailings decreased by 0.06%, and the lead recovery rate increased by 2.42 percentage points. At the same time, the reagent dosage was reduced by 10 g / t. Under the premise of increasing the lead concentrate grade, the lead concentrate recovery rate was also significantly improved, while the reagent dosage was reduced to a large extent, thus reducing the beneficiation cost.

[0039] Example 3

[0040] This embodiment is another example of the application of the lead sulfide collector described in this invention in the flotation of complex polymetallic mixed minerals.

[0041] The mineral raw material is a lead-zinc mine in Russia. The most abundant valuable metallic minerals in this ore are galena, sphalerite, and pyrite, with contents of 5.8% for galena, 13.6% for sphalerite, and 57.6% for pyrite. The main gangue minerals are quartz, montmorillonite, illite, calcite, and chlorite, with contents of 2.4% for quartz, 2.2% for montmorillonite, 2.0% for illite, 1.8% for calcite, and 1.0% for chlorite.

[0042] The specific operating steps are as follows:

[0043] (1) After the ore is crushed, a zinc-sulfur-suppressing and lead-floating-zinc-sulfur-suppressing process is adopted. 3 kg / t of lime (pyrite inhibitor), 0.6 kg / t of sodium sulfite (sphalerite inhibitor), and 0.8 kg / t of zinc sulfate are added to the slurry and stirred for 3 minutes.

[0044] (2) Take 0.02 kg / t of the above-mentioned lead sulfide collector and 0.02 kg / t of the frother methyl isobutyl methanol, add them to the slurry and stir for 1 minute. The flotation time is 5 minutes.

[0045] (3) Take 8 g / t of the lead sulfide collector and add it to the roughing pulp for two scavenging processes, each lasting 2 minutes.

[0046] (4) Add 1 kg / t of lime, 0.1 kg / t of sodium sulfite, and 0.4 kg / t of zinc sulfate to the roughing and scavenging lead concentrate slurry for two cleaning processes, each lasting 3 minutes. Collect the concentrate tailings, filter, dry, and weigh them.

[0047] Under the same conditions, 30 g / t of black powder was added for comparison. The zinc content and lead recovery rate in the obtained lead concentrate are shown in Table 2.

[0048] Table 2 Results of Lead Flotation Test

[0049]

[0050] As can be seen from Table 2, by comparing the test data of black reagent and lead sulfide collector of the present invention, it can be found that when using lead sulfide collector of the present invention, the lead grade in lead concentrate is increased by 3.5%, the lead recovery rate is increased by 6.57 percentage points, and the reagent dosage is reduced by 10 g / t, which greatly improves the lead grade and recovery rate, and also greatly reduces the amount of reagent used, thus reducing the beneficiation cost.

[0051] The preferred embodiments of the present invention have been described in detail above, illustrating that after changing the reagent formulation, the lead grade and recovery rate are significantly improved, with the lead recovery rate increasing by 2-7 percentage points. This reduces beneficiation costs while improving beneficiation efficiency. The scope of protection of the present invention is not limited to the above description and specific embodiments; any simple modifications or substitutions made based on the technical solution and concept of the present invention are also within the scope of protection of the present invention.

Claims

1. An application of a lead sulfide collector in the flotation of complex polymetallic mixed minerals, characterized in that, The main active ingredient of the lead sulfide collector is dimethoate, including: Step one, the preparation of the lead sulfide collector, is carried out according to the following steps: (1) After weighing the dimethoate, grind it to a thickness of less than 0.074 mm; (2) Place the ground dimethoate into a mixer, keep stirring and add water to the mixer at a weight ratio of 1:49; (3) Stir continuously for 30 minutes until the raw materials are fully dissolved to obtain the lead sulfide collector; Dimethoate, chemically named O,O-dimethyl-S-(N-methylcarbamoylmethyl)dithiophosphate, has the molecular formula C5H. 12 NO3PS2, Step two, the application of lead sulfide collectors in the flotation of complex polymetallic mixed minerals, includes the following steps: (1) After the pyrrhotite is selected, the mineral is placed in the flotation cell and water is added and stirred to make the mass concentration of the pulp 25%; (2) Take sodium sulfite inhibitor at a rate of 0.8 kg-1 kg per ton of ore, take zinc sulfate inhibitor at a rate of 0.4 kg-0.6 kg per ton of ore and add the inhibitors to the slurry to be processed. Take methyl isobutyl methanol frother at a rate of 0.02 kg per ton of ore and add it to the slurry to be processed. Take the above lead sulfide collector at a rate of 0.02 kg-0.03 kg per ton and add it to the slurry to be processed for flotation. The roughing time is 4 minutes. (3) Take the above lead sulfide collector and add it to the slurry after roughing at a dosage of 5g-10g per ton of ore for two scavenging processes, with a scavenging time of 2 minutes each. (4) Sodium sulfite is added to the roughing and scavenging concentrate slurry at a rate of 0.4-0.5 kg per ton of ore, and zinc sulfate is added to the rate of 0.2-0.3 kg per ton of ore. Two cleaning processes are carried out, with each cleaning time being 2.5 minutes.

2. The application of the lead sulfide collector according to claim 1 in the flotation of complex polymetallic mixed minerals, characterized in that, The mineral raw material is brittle stibnite, with the following component contents: lead 2.16%, antimony 2.05%, zinc 8.2%, tin 1.82%, iron 31%, and silver 65 g / t. The sulfide minerals in the ore are brittle stibnite, sphalerite, pyrite, and pyrrhotite; the oxide minerals are cassiterite and hematite; and the gangue minerals are quartz, mica, and carbonate minerals. After crushing, the ore is ground using ball mills and rod mills. The ground minerals are then subjected to magnetic separation to obtain pyrrhotite concentrate. The magnetically separated minerals are then subjected to lead-antimony flotation, followed by zinc-sulfur co-flotation. The zinc-sulfur concentrate is then separated from the zinc, and finally, the zinc-sulfur concentrate is subjected to gravity separation using a shaking table to obtain tin concentrate. The specific operating steps are as follows: (1) Take 200g of the magnetically separated minerals and mix them with 800ml of water and place them in a flotation machine for lead-antimony flotation; (2) Add 1 kg / t of sodium sulfite and 500 g / t of zinc sulfate to the ore slurry to be processed, and stir for 2 minutes. (3) Take 20g / t of frother methyl isobutyl methanol and 20g / t of the above lead sulfide collector, add them to the slurry to be selected and stir for 1 minute, roughing time is 4 minutes; (4) Take 8g / t of the lead sulfide collector and add it to the roughing pulp and stir for 1 minute, and then perform two scavenging processes. (5) Take 400 kg / t of sodium sulfite and 200 g / t of zinc sulfate and add them to the roughing and scavenging concentrate for fine cleaning. The fine cleaning time is 2.5 minutes.

3. The application of the lead sulfide collector according to claim 1 in the flotation of complex polymetallic mixed minerals, characterized in that, The mineral raw material is lead-zinc ore. This ore contains valence metal minerals: galena, sphalerite, and pyrite, with contents of 5.8% for galena, 13.6% for sphalerite, and 57.6% for pyrite. The gangue minerals are quartz, montmorillonite, illite, calcite, and chlorite, with contents of 2.4% for quartz, 2.2% for montmorillonite, 2.0% for illite, 1.8% for calcite, and 1.0% for chlorite. After crushing, the ore is subjected to a zinc-sulfur suppression and lead-floating process followed by zinc-sulfur suppression. The specific operating steps are as follows: (1) Add 3 kg / t of lime (pyrite inhibitor), 0.6 kg / t of sodium sulfite (sphalerite inhibitor), and 0.8 kg / t of zinc sulfate to the slurry and stir for 3 minutes; (2) Take 0.02 kg / t of the above lead sulfide collector and 0.02 kg / t of frother methyl isobutyl methanol and add them to the slurry and stir for 1 minute. The flotation time is 5 minutes. (3) Take 8g / t of the lead sulfide collector and add it to the roughing pulp for two scavenging processes, with a scavenging time of 2 minutes. (4) Take 1 kg / t of lime, 0.1 kg / t of sodium sulfite and 0.4 kg / t of zinc sulfate and add them to the roughing and scavenging lead concentrate slurry for two cleaning processes, with each cleaning time being 3 minutes.

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