Method for comprehensive recovery and utilization of lead-tin-silver oxide ore

Abstract

The application discloses a method for comprehensive recovery and utilization of oxidized lead-tin-silver ore, which comprises the steps of pretreatment, oxidized lead flotation, mixed concentrate concentration, table operation and post-treatment. The oxidized lead-silver-tin is recovered through the combined process of flotation and gravity separation, and the process flow is simple, easy to operate, energy-saving, environment-friendly, and good in applicability. The obtained lead concentrate is high in lead grade and high in recovery rate, and tin and silver are comprehensively recovered and utilized in the form of various valuable minerals.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical and chemical technology, specifically relating to a method for the comprehensive recovery and utilization of oxidized lead-silver-tin ore. Background Technology

[0002] Lead and tin are metals used by humankind since ancient times. my country's demand for lead and tin resources continues to increase. Although my country has abundant mineral resources, their grade is low, and over 85% of non-ferrous metal ores are complex, difficult-to-process minerals with complex associated and symbiotic relationships, resulting in high mining and beneficiation costs and low overall recovery rates. Therefore, improving the comprehensive recovery of valuable minerals in polymetallic oxide lead ores to ensure full resource utilization is of great significance to the sustainable development of my country's non-ferrous metal industry. Currently, the main methods for processing oxide lead ores are sulfide-xanthate flotation, chelating agent-neutral oil flotation, leaching-flotation, and direct anionic collector flotation. However, none of these methods can comprehensively recover and utilize multiple valuable minerals. Therefore, developing a method that can solve the above-mentioned technical problems is essential. Summary of the Invention

[0003] The purpose of this invention is to provide a method for the comprehensive recovery and utilization of oxidized lead-silver-tin ore.

[0004] The objective of this invention is achieved as follows: the method for comprehensive recovery and utilization of lead-tin-silver oxide ore includes pretreatment, lead oxide flotation, mixed concentrate cleaning, shaking table operation, and post-treatment steps, specifically including:

[0005] A. Pre-treatment: Grind the raw ore to be treated to 65-80% of its material to -0.074mm to obtain material a;

[0006] B. Lead oxide flotation: Add sulfiding agent to material a and stir for 5-8 minutes, then add lead oxide silver collector and stir for 1-3 minutes, then add No. 2 oil and stir for 0.5-1.5 minutes to carry out lead oxide silver flotation with two stages of roughing and one stage of scavenging to obtain mixed concentrate b and flotation tailings c.

[0007] C. Mixed concentrate refining: Mixed concentrate b is refined once to obtain lead-silver concentrate d and middlings e. Middlings e is returned to the roughing step.

[0008] D. Shaking table operation:

[0009] 1) The flotation tailings c are processed by a shaking table to obtain heavy products tin concentrate f, tailings g, shaking table middlings h and shaking table middlings i;

[0010] 2) The ore in the shaking table h is shaken to obtain heavy product tin concentrate j, tailings k and ore in the shaking table l;

[0011] 3) Grind the ore l in the shaking table to -0.045mm, accounting for 40~50%, and feed it into the shaking table for gravity separation to obtain lead-silver concentrate m and tailings n; combine lead-silver concentrate d and lead-silver concentrate m to obtain the final product lead concentrate;

[0012] 4) The ore i in the shaking table is shaken to obtain heavy product o and tailings p;

[0013] 5) Grind the heavy product o to -0.045mm (80-90%) and then use a shaking table to obtain tin concentrate q and tailings r;

[0014] E. Post-processing: Tin concentrate f, tin concentrate j and tin concentrate q are combined to obtain the final product tin concentrate; tailings g, tailings k, tailings p and tailings r are combined to obtain the final product tailings.

[0015] The specific steps are as follows:

[0016] A. Grinding: Grind the raw ore to a fineness of -0.074mm, accounting for 65% to 80%;

[0017] B. Lead oxide flotation operation: Add 3000-5000g / t of sodium sulfide as a sulfidizing agent to the ground slurry and stir for 5-8 minutes. Then add 100-800g / t of lead oxide silver collector (sodium isobutyl xanthate, potassium isoamyl xanthate, or one or more of dibutyl dithiophosphate) and stir for 1-3 minutes. Then add 10-30g / t of No. 2 oil and stir for 1 minute to carry out lead oxide silver flotation with two roughing stages and one scavenging stage. The froth products from the two roughing stages are combined as mixed concentrate and enter the next operation. The scavenging products are returned sequentially, and the tailings enter the next operation.

[0018] C. Mixed concentrate refining operation: The mixed concentrate is refined once, and the refined foam product is used as lead-silver concentrate 1. The middlings are returned in sequence.

[0019] D. Shaking table operation 1: The flotation tailings are subjected to shaking table gravity separation to obtain heavy products tin concentrate 1, tailings 1, shaking table middlings 1 and shaking table middlings 2, which are then put into the next operation.

[0020] E. Shaking table operation 2: Shaking table middlings 1 is shaken to obtain heavy product tin concentrate 2, tailings 2 and shaking table middlings 3, which are then put into the next operation;

[0021] F. Re-grinding and re-selection operation: The middlings 3 of the shaking table are fed into the mill and ground to -0.045mm, accounting for 40% to 50%, and then fed into the shaking table for gravity separation to obtain lead-silver concentrate 2 and tailings 3. The lead-silver concentrate 1 and lead-silver concentrate 2 obtained by flotation are combined to obtain the final product lead concentrate.

[0022] G. Shaking table operation 4: The ore 2 obtained in step D is shaken to obtain tailings 4, and the heavy product enters the next operation;

[0023] H. Heavy product regrinding and re-selection operation: The heavy product is ground to -0.045mm, accounting for 80% to 90%. The ground slurry is subjected to a shaking table to obtain tin concentrate 3 and tailings 5. Tin concentrate 1, tin concentrate 2 and tin concentrate 3 are combined to obtain the final product tin concentrate. Tailings 1, tailings 2, tailings 3, tailings 4 and tailings 5 ​​are combined as the final product tailings.

[0024] This invention utilizes a combined flotation-gravity separation process to recover oxide lead, silver, and tin. The process is simple, easy to operate, energy-saving, environmentally friendly, and widely applicable. The resulting lead concentrate has a high lead grade and a high recovery rate, while tin and silver are recovered and utilized as a variety of valuable minerals. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the process flow of the present invention. Detailed Implementation

[0026] The present invention will be further described below with reference to embodiments, but this is not intended to limit the present invention in any way. Any modifications or substitutions made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0027] The method for comprehensive recovery and utilization of lead-tin-silver oxide ore described in this invention includes pretreatment, lead oxide flotation, mixed concentrate cleaning, shaking table operation, and post-treatment steps, specifically including:

[0028] A. Pre-treatment: Grind the raw ore to be treated to 65-80% of its material to -0.074mm to obtain material a;

[0029] B. Lead oxide flotation: Add sulfiding agent to material a and stir for 5-8 minutes, then add lead oxide silver collector and stir for 1-3 minutes, then add No. 2 oil and stir for 0.5-1.5 minutes to carry out lead oxide silver flotation with two stages of roughing and one stage of scavenging to obtain mixed concentrate b and flotation tailings c.

[0030] C. Mixed concentrate refining: Mixed concentrate b is refined once to obtain lead-silver concentrate d and middlings e. Middlings e is returned to the roughing step.

[0031] D. Shaking table operation:

[0032] 1) The flotation tailings c are processed by a shaking table to obtain heavy products tin concentrate f, tailings g, shaking table middlings h and shaking table middlings i;

[0033] 2) The ore in the shaking table h is shaken to obtain heavy product tin concentrate j, tailings k and ore in the shaking table l;

[0034] 3) Grind the ore l in the shaking table to -0.045mm, accounting for 40~50%, and feed it into the shaking table for gravity separation to obtain lead-silver concentrate m and tailings n; combine lead-silver concentrate d and lead-silver concentrate m to obtain the final product lead concentrate;

[0035] 4) The ore i in the shaking table is shaken to obtain heavy product o and tailings p;

[0036] 5) Grind the heavy product o to -0.045mm (80-90%) and then use a shaking table to obtain tin concentrate q and tailings r;

[0037] E. Post-processing: Tin concentrate f, tin concentrate j and tin concentrate q are combined to obtain the final product tin concentrate; tailings g, tailings k, tailings p and tailings r are combined to obtain the final product tailings.

[0038] The sulfiding agent mentioned in step B is sodium sulfide.

[0039] The amount of vulcanizing agent added is 3000~5000g / t.

[0040] The lead-silver oxide collector mentioned in step B is one or more of sodium isobutylxanate, potassium isopentylxanate, and dibutyldithiophosphate.

[0041] The amount of lead oxide silver collector added is 100~800g / t.

[0042] The invention will be further illustrated below with specific implementation examples:

[0043] Example 1

[0044] The raw ore from a beneficiation plant in Mengzi, Yunnan Province, contains 9.85% lead, 0.58% tin, and 165.2 g / t of silver. Lead in the ore mainly exists in oxide form, primarily as lead sulfate, ferroalloy, and other lead compounds, along with small amounts of cerussite and galena. Tin is mainly in the form of cassiterite, with fine grain size and complex symbiotic relationships. The above ore sample was processed using the following steps:

[0045] A. Grinding: Grind the raw ore to a fineness of -0.074mm, accounting for 70%;

[0046] B. Lead oxide flotation operation: Add 4000g / t of sodium sulfide as a sulfidizing agent to the ground slurry and stir for 6 minutes. Then add 300g / t of sodium isobutyl xanthate, 300g / t of potassium isoamyl xanthate, and 100g / t of dibutyl dithiophosphate and stir for 3 minutes. Then add 20g / t of No. 2 oil and stir for 1 minute to carry out lead oxide silver flotation with two roughing stages and one scavenging stage. The froth products from the two roughing stages are combined as mixed concentrate and enter the next operation. The scavenging products are returned sequentially, and the tailings enter the next operation.

[0047] C. Mixed concentrate refining operation: The mixed concentrate is refined once, and the refined foam product is used as lead-silver concentrate 1. The middlings are returned in sequence.

[0048] D. Shaking table operation 1: Flotation tailings are shaken to obtain heavy products tin concentrate 1, tailings 1, shaking table middlings 1 and shaking table middlings 2, which are then put into the next operation.

[0049] E. Shaking table operation 2: Shaking table ore 1 is shaken to obtain heavy product tin concentrate 2 and tailings 2, and shaking table ore 3 enters the next operation;

[0050] F. Re-grinding and re-selection operation: The middlings 3 of the shaking table are fed into the mill and ground to -0.045mm, accounting for 40%, and then fed into the shaking table for gravity separation to obtain lead concentrate 2 and tailings 3. The lead-silver concentrate 1 and lead-silver concentrate 2 obtained by flotation are combined to obtain the final product lead concentrate.

[0051] G. Shaking table operation 4: The ore 2 obtained in step D is shaken to obtain tailings 4, and the heavy product enters the next operation;

[0052] H. Heavy product regrinding and re-selection operation: Grind the heavy product to -0.045mm (90%). The ground slurry is subjected to a shaking table to obtain tin concentrate 3 and tailings 5. Tin concentrate 1, tin concentrate 2, and tin concentrate 3 are combined to obtain the final product tin concentrate. Tailings 1, tailings 2, tailings 3, tailings 4, and tailings 5 ​​are combined as the final product tailings.

[0053] Using the above process to process the ore, a lead concentrate with a lead grade of 33.71%, a silver grade of 401.66 g / t, a lead recovery rate of 68.61%, and a silver recovery rate of 44.37% can be obtained; a tin concentrate with a tin grade of 20.05% and a tin recovery rate of 60.72% can also be obtained.

[0054] After grinding the raw ore, multiple shaking table gravity separations can be performed to obtain lead concentrate with a lead grade of 41.92%, silver grade of 339.80 g / t, lead recovery rate of 25.98%, and silver recovery rate of 12.12%. Tin concentrate with a tin grade of 18.50% and tin recovery rate of 48.02% can also be obtained. The method of this invention can improve the comprehensive utilization rate of polymetallic mineral resources.

[0055] Example 2

[0056] The raw ore from a beneficiation plant in Yingjiang, Yunnan Province, contains 0.032% copper, 0.080% bismuth, and 0.55% tungsten. It is a copper-bismuth-tungsten polymetallic sulfide oxide ore. The main useful metallic minerals include chalcopyrite, bismuthite, wolframite, scheelite, and malachite. The above ore sample will be processed through the following steps:

[0057] A. Grinding: Grind the raw ore to a fineness of -0.074mm, accounting for 70%;

[0058] B. Copper-bismuth flotation operation: Add 50g / t of sodium isobutyl xanthate and 50g / t of potassium isoamyl xanthate to the ground slurry and stir for 3 minutes. Then add 20g / t of No. 2 oil and stir for 1 minute to carry out copper-bismuth flotation with two roughing stages and one scavenging stage. The frothy products from the two roughing stages are combined as mixed concentrate and enter the next operation. The scavenging products are returned sequentially, and the tailings enter the next operation.

[0059] C. Mixed concentrate refining operation: The mixed concentrate undergoes one refining process. The refined foam product is used as copper-bismuth concentrate, and the middlings are returned in sequence.

[0060] D. Shaking table operation 1: The flotation tailings are subjected to shaking table gravity separation to obtain heavy products tungsten concentrate 1, tailings 1, shaking table middlings 1 and shaking table middlings 2, which are then put into the next operation.

[0061] E. Shaking table operation 2: Shaking table middlings 1 is shaken to obtain heavy product tungsten concentrate 2, tailings 2, shaking table middlings 3, which will then proceed to the next operation;

[0062] F. Re-grinding and re-selection operation: The middlings 3 of the shaking table are fed into the mill and ground to -0.045mm, accounting for 50%, and then fed into the shaking table for gravity separation to obtain tungsten concentrate 3 and tailings 3;

[0063] G. Shaking table operation 4: The ore 2 obtained in step D is shaken to obtain tailings 4, and the heavy product enters the next operation;

[0064] H. Heavy product regrinding and re-selection operation: Grind the heavy product to -0.045mm (90%), and then use a shaking table to obtain heavy product tungsten concentrate 4 and tailings 5. Combine tungsten concentrate 1, tungsten concentrate 2, tungsten concentrate 3 and tungsten concentrate 4 to obtain the final product tungsten concentrate.

[0065] By processing the ore using the above process, a copper-bismuth concentrate with a copper grade of 0.675%, a bismuth grade of 4.265%, and a tungsten grade of 0.225% and copper-bismuth-tungsten recovery rates of 21.52%, 53.94%, and 0.41%, respectively, can be obtained; a tungsten concentrate with a tungsten grade of 46.45% and a tungsten recovery rate of 60.67% can also be obtained. The method of this invention can improve the comprehensive utilization rate of polymetallic mineral resources.

Claims

1. A method for comprehensive recovery and utilization of lead-tin-silver oxide ore, characterized in that, The method for comprehensive recovery and utilization of the lead oxide silver tin ore comprises pretreatment, lead oxide flotation, mixed concentrate cleaning, table operation and post-treatment steps, and specifically comprises the following steps: A, pretreatment: grinding the to-be-treated raw ore to 65-80% of -0.074 mm to obtain material a; B, lead oxide flotation: adding a sulfidizing agent to the material a and stirring for 5-8 min, then adding a lead oxide silver collecting agent and stirring for 1-3 min, and then adding 2# oil and stirring for 0.5-1.5 min to perform two-stage roughing and one-stage scavenging lead oxide silver flotation to obtain mixed concentrate b and flotation tailings c; C, mixed concentrate cleaning: performing one-time cleaning on the mixed concentrate b to obtain lead silver concentrate d and middlings e, and returning the middlings e to the roughing step; D, table operation: 1) obtaining heavy product tin concentrate f, tailings g, table middlings h and table middlings i from the flotation tailings c through a table; 2) obtaining heavy product tin concentrate j, tailings k and table middlings l from the table middlings h through a table; 3) grinding the table middlings l to 40-50% of -0.045 mm, feeding into a table for reselection, obtaining lead silver concentrate m and tailings n; combining the lead silver concentrate d and the lead silver concentrate m to obtain final product lead concentrate; 4) obtaining heavy product o and tailings p from the table middlings i through a table; 5) grinding the heavy product o to 80-90% of -0.045 mm, performing table operation to obtain tin concentrate q and tailings r; E, post-treatment: combining the tin concentrate f, the tin concentrate j and the tin concentrate q to obtain final product tin concentrate; combining the tailings g, the tailings k, the tailings p and the tailings r to obtain final product tailings.

2. The method for comprehensive recovery and utilization of lead tin silver oxide ore according to claim 1, characterized in that, The sulfidizing agent in the B step is sodium sulfide.

3. The method for comprehensive recycling of lead silver tin oxide ore according to claim 1 or 2, characterized in that, The addition amount of the sulfidizing agent is 3000-5000 g / t.

4. The method for comprehensive recovery and utilization of lead tin silver oxide ore according to claim 1, characterized in that, The lead oxide silver collecting agent in the B step is one or more of sodium isobutyl xanthate, potassium isoamyl xanthate and ammonium dibutyl dithiophosphate.

5. The method for comprehensive recycling of lead silver tin oxide ore according to claim 1 or 4, characterized in that, The addition amount of the lead oxide silver collecting agent is 100-800 g / t.

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