A method for the flotation separation of jamesonite and marmatite

Abstract

A kind of jamesonite and marmatite flotation separation method, comprising the following steps: (1) the lead-zinc ore containing jamesonite and marmatite is ground, so that the content of-74 microns is 80-90%, to obtain the concentration of 30-40% flotation slurry;(2) put Congo red dye into stirring barrel to make 5% mass concentration solution;(3) add 300-1200g / t Congo red dye to neutral pH slurry, and react with slurry for 5min, then add ethion and frother, after pulp conditioning, carry out flotation to obtain lead rough concentrate;(4) carry out cleaning operation on lead rough concentrate, only add Congo red dye in cleaning, and the amount of reagent is 50% of the previous operation.Middlings are returned to the previous operation in turn.The present application uses Congo red dye as depressor, which has good selectivity to marmatite, and can realize efficient separation of jamesonite and marmatite at neutral pH.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, specifically a flotation separation method for brittle antimony lead ore and iron sphalerite. Background Technology

[0002] Stibnite is a sulfide mineral unique to my country. Its floatability is similar to galena, but it is often associated with sphalerite and ferro-sphalerite. Reducing the zinc content in stibnite has always been a hot research topic in mineral processing. Although ferro-sphalerite has lower floatability than sphalerite, copper and lead ions dissolved from polymetallic sulfide ores have a very good activation effect on it. Therefore, the cyanide method, sulfide method, and sulfur oxide (sulfite) method are commonly used methods for suppressing ferro-sphalerite and sphalerite.

[0003] Cyanide has a strong inhibitory effect on sphalerite, but it is also highly toxic and has now been banned; sodium sulfide is too corrosive to equipment and easily releases hydrogen sulfide gas, which is detrimental to the health of on-site workers; sulfites are easily oxidized and degraded during use, reducing their inhibitory effect on iron sphalerite.

[0004] Moreover, in order to achieve better lead-zinc separation results, lead-zinc separation operations are often carried out under higher pH conditions, which has adverse effects on production management and the environment. Summary of the Invention

[0005] This invention addresses the aforementioned problems in lead-zinc separation by providing a flotation separation method for brittle antimony lead ore and iron sphalerite. This method features high selectivity and low dosage, and can suppress iron sphalerite under natural pH conditions.

[0006] The technical solution of the present invention is as follows: A flotation separation method for brittle stibnite and sphalerite, using Congo red dye as an inhibitor, includes the following steps:

[0007] (1) Grind lead-zinc ore containing brittle lead-antimony ore and iron sphalerite to make the -74 micron content 80-90% and obtain flotation slurry with a flotation concentration of 30-40%.

[0008] (2) Prepare a 5% (w / w) solution of Congo red dye in a stirring tank at room temperature;

[0009] (3) Add 800-1200 g / t of Congo red dye to the neutral slurry pH value, react with the slurry for 5 min, then add ethyl thiocyanate and frother, and after the slurry is adjusted, carry out flotation to obtain lead crude concentrate.

[0010] (4) Perform a fine cleaning operation on the lead rough concentrate, adding only Congo red dye, with the amount of dye added being 50% of that in the previous operation. The middlings obtained in the above steps are returned to the previous operation in sequence.

[0011] The present invention has the following advantages:

[0012] (1) The iron sphalerite inhibitor has the characteristic of good selectivity. The sulfonic acid group and amino group functional group in Congo red dye interact selectively with iron sphalerite, thereby inhibiting the hydrophilicity of the iron sphalerite surface.

[0013] (2) This iron sphalerite inhibitor can selectively inhibit iron sphalerite under natural pH conditions, which is friendly to production management and the environment.

[0014] (3) This iron sphalerite inhibitor is simple to prepare, easily soluble in water, and easy to operate. It can be widely used in lead-zinc separation operations. Attached Figure Description

[0015] Figure 1 This is a molecular structure diagram of the Congo red dye described in this invention. Specific Implementation

[0016] The technical solution of the present invention will be further described in detail below with reference to the embodiments, but the scope of protection of the invention is not limited to the content described.

[0017] Example 1

[0018] This embodiment is an example of the flotation separation method for brittle antimony ore and sphalerite described in this invention. The sample used is a lead-zinc mine in Guangxi. Lead mainly exists in the form of brittle antimony ore, and zinc mainly exists in the form of sphalerite. The contents of antimony, lead, and zinc in the ore are 0.18%, 0.43%, and 2.35%, respectively, and the iron content in the sphalerite is 8.11%. Gangue minerals include quartz and calcite. The specific operating steps are as follows:

[0019] (1) Grind the lead-zinc ore containing brittle sulfur lead-antimony ore and iron sphalerite to make the -74 micron content 82% and obtain a flotation slurry with a flotation concentration of 32%.

[0020] (2) Prepare a 5% (w / w) solution of Congo red dye in a stirring tank at room temperature;

[0021] (3) Under natural pH conditions, add 800 g / t of Congo red dye to lead roughing and react with the slurry for 5 min. Then add 150 g / t of ethyl thiocyanate and 40 g / t of frother and react for 3 min and 1 min respectively. After the slurry is adjusted, flotation is carried out to obtain lead rough concentrate.

[0022] (4) The lead rough concentrate is cleaned by adding Congo red dye. The amount of Congo red dye used in the first, second, and third cleaning operations is 400 g / t, 200 g / t, and 100 g / t, respectively. The middlings in the process are returned to the previous operation. Using this process, the final antimony + lead grade is 40.56%, the recovery rate is 80.32%, and the zinc content in the concentrate product is 3.57%.

[0023] Example 2

[0024] This embodiment is another example of the flotation separation method for brittle antimony lead ore and sphalerite described in this invention. The mineral raw material is a lead-zinc mine in Guangxi. Brittle antimony lead ore is the main lead-bearing mineral, and sphalerite is the main zinc-bearing mineral. The contents of antimony, lead, and zinc in this mine are 0.24%, 0.49%, and 2.58%, respectively, and the iron content in the sphalerite is 8.54%. Gangue minerals include quartz and calcite. The specific operating steps are as follows:

[0025] (1) Grind lead-zinc ore containing brittle lead-antimony ore and iron sphalerite to make the -74 micron content 85% to obtain flotation slurry with a flotation concentration of 35%;

[0026] (2) Prepare a 5% (w / w) solution of Congo red dye in a stirring tank at room temperature;

[0027] (3) Under natural pH conditions, add 1000g / t of Congo red dye to lead roughing and react with the slurry for 5min. Then add 180g / t of ethyl thiocyanate and 50g / t of frother and react for 3min and 1min respectively. After the slurry is adjusted, flotation is carried out to obtain lead rough concentrate.

[0028] (4) The lead rough concentrate is treated with a finer refining process. Only Congo red dye is added during this process. The amounts of Congo red dye used in refinement processes one, two, and three are 500 g / t, 250 g / t, and 125 g / t, respectively. The middlings from the process are returned to the previous process sequentially. Using this process, the final antimony + lead grade is 40.87%, the recovery rate is 80.65%, and the zinc content in the concentrate product is 3.45%.

[0029] Example 3

[0030] This embodiment is another example of the flotation separation method for brittle antimony lead ore and sphalerite described in this invention. The mineral raw material is a lead-zinc mine in Guangxi. Brittle antimony lead ore is the main lead-bearing mineral, and sphalerite is the main zinc-bearing mineral. The contents of antimony, lead, and zinc in this mine are 0.30%, 0.51%, and 2.96%, respectively, and the iron content in the sphalerite is 9.35%. Gangue minerals include quartz and calcite. The specific operating steps are as follows:

[0031] (1) Grind the lead-zinc ore containing brittle lead-antimony ore and iron sphalerite to make the -74 micron content 90% and obtain a flotation slurry with a flotation concentration of 36%.

[0032] (2) Prepare a 5% (w / w) solution of Congo red dye in a stirring tank at room temperature;

[0033] (3) Under natural pH conditions, add 1200 g / t of Congo red dye to lead roughing and react with the slurry for 5 min. Then add 200 g / t of ethyl thiocyanate and 50 g / t of frother and react for 3 min and 1 min respectively. After the slurry is adjusted, flotation is carried out to obtain lead rough concentrate.

[0034] (4) The lead rough concentrate is treated with Congo red dye. The amount of Congo red dye used in treatments one, two, and three is 600 g / t, 300 g / t, and 150 g / t, respectively. The middlings are returned to the previous treatment in sequence. Using this process, the final antimony + lead grade is 41.22%, the recovery rate is 81.48%, and the zinc content in the concentrate is 3.68%.

[0035] This invention utilizes the selective bonding ability of sulfonic acid and amino functional groups in Congo red dye to sphalerite, achieving efficient separation of brittle pyrolusite and sphalerite under natural pH conditions.

Claims

1. A flotation separation method for brittle antimony lead ore and iron sphalerite, characterized in that, Using Congo red dye as an inhibitor, the steps include: (1) Grind lead-zinc ore containing brittle sulfur lead-antimony ore and iron sphalerite to make the -74 micron content 80~90% to obtain flotation slurry with a flotation concentration of 30~40%; (2) Prepare a 5% (w / w) solution of Congo red dye in a stirring tank at room temperature; (3) Add 800~1200g / t of Congo red dye to the neutral pH slurry and react with the slurry for 5min. Then add ethyl thiocyanate and frother. After the slurry is adjusted, flotation is carried out to obtain lead crude concentrate. (4) The lead rough concentrate is finely treated. Only Congo red dye is added during the fine treatment. The amount of reagent added is 50% of that in the previous operation. The obtained middlings are returned to the previous operation in sequence. Lead-zinc ores containing brittle sulfide and sphalerite contain 0.30% antimony, 0.51% lead, and 2.96% zinc, respectively, with 9.35% iron in the sphalerite. Alternatively, lead-zinc ores containing brittle sulfide and sphalerite contain 0.24% antimony, 0.49% lead, and 2.58% zinc, respectively, with 8.54% iron in the sphalerite. Gangue minerals include quartz and calcite.

2. The flotation separation method for brittle antimony lead ore and iron sphalerite according to claim 1, characterized in that, The Congo red dye was used as an inhibitor, and the specific operating steps are as follows: (1) Grind the lead-zinc ore containing brittle sulfur lead-antimony ore and iron sphalerite to make the -74 micron content 90% and obtain a flotation pulp with a flotation concentration of 36%. (2) Prepare a 5% (w / w) solution of Congo red dye in a stirring tank at room temperature; (3) Under natural pH conditions, add 1200 g / t of Congo red dye to lead roughing and react with the slurry for 5 min. Then add 200 g / t of ethyl thiocyanate and 50 g / t of frother and react for 3 min and 1 min respectively. After the slurry is adjusted, flotation is carried out to obtain lead rough concentrate. (4) The lead rough concentrate is finely treated. Only Congo red dye is added during the fine treatment. The amount of Congo red dye used in the first, second and third fine treatments is 600g / t, 300g / t and 150g / t, respectively. The middlings in the process are returned to the previous treatment in sequence. Finally, the antimony + lead grade is 41.22%, the recovery rate is 81.48%, and the zinc content in the concentrate product is 3.68%.

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