A depressant for separating talc from chalcopyrite by flotation and application thereof

Abstract

The application discloses a talc and chalcopyrite floatation separation inhibitor and application, and belongs to the technical field of sulfide copper minerals and hydrophobic silicate gangue ore separation. The inhibitor is welan gum, and the welan gum is used as a talc inhibitor for separating chalcopyrite and talc; the application mainly adds the inhibitor welan gum, so that the welan gum is selectively adsorbed on the surface of talc, the hydrophobic difference between talc and chalcopyrite is enlarged, the hydrophobic difference between talc and chalcopyrite is enlarged, and the separation of chalcopyrite and talc is realized. In addition, the talc inhibitor welan gum has the characteristics of non-toxicity and good environmental friendliness.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of talc and chalcopyrite flotation separation inhibitor and application, belong to mineral processing reagent technical field. BACKGROUND

[0002] Copper is one of the earliest discovered and used metals by human, with good electrical conductivity, thermal conductivity, ductility and corrosion resistance. It is widely used in power manufacturing, real estate, electrical industry, electronic technology and aircraft, ship and automobile manufacturing industries. China's copper resources are characterized by more lean ore, small deposit scale and more associated ore. Chalcopyrite is one of the main raw materials for producing copper and its compounds, and is commonly used in industrial enrichment and separation of chalcopyrite by froth flotation. With the rapid development of national economy, China's copper resources cannot meet the needs of economic construction, so it is of great significance to carry out comprehensive development and utilization of copper and associated resources.

[0003] Talc has good natural hydrophobicity, and it is a common gangue mineral in sulfide ore, especially in molybdenum and copper / nickel sulfide ore. Due to its good floatability, it is difficult to separate talc from valuable minerals by flotation, and it is easy to enter the copper concentrate with chalcopyrite, resulting in a decrease in concentrate quality. In addition, the increase of magnesium content in copper concentrate will cause the slag to be sticky and the melting point to rise, thus increasing the smelting cost. Therefore, effective separation and removal of talc powder from chalcopyrite not only can improve the efficiency of resource utilization, but also can reduce the production cost, which has become the focus of current research. SUMMARY

[0004] In order to solve the technical problem of high-efficiency flotation separation of copper sulfide minerals from natural gangue minerals with good floatability, the present application provides a method for flotation separation of chalcopyrite and talc using welan gum. The collector welan gum has good inhibition effect on talc, is non-toxic and environmentally friendly, and has strong applicability.

[0005] The technical scheme of the present application is as follows:

[0006] A chalcopyrite and talc flotation separation inhibitor, the inhibitor is welan gum.

[0007] The present application provides an application of a talc and chalcopyrite flotation separation inhibitor, characterized by the following specific steps:

[0008] (1) crushing and grinding: crushing the raw ore to less than 2mm, and then grinding to a particle size of less than 74μm of 80~85%;

[0009] (2) Adjusting pulp: the ore after grinding in step (1) is placed in a flotation tank, water is added and the pulp concentration is adjusted to 30-35%, to obtain uniform pulp, and then the pH of the pulp is adjusted to 7.0-9.0 by using a pH adjusting agent;

[0010] (3) Flotation: the pulp with adjusted pH in step (2) is subjected to one roughing, one scavenging and three cleaning operations, in which the depressant Vylan glue, the collector butyl xanthate and the frother MIBC are added in sequence in the roughing operation, each of the reagents is stirred for 3-5 min after being added, and air flotation is carried out; the reagent dosage in the scavenging operation is half of that in the roughing operation; the depressant Vylan glue is added in the cleaning operations to separate the talc and the chalcopyrite, to obtain the concentrate and the tailings, the concentrate is the target mineral chalcopyrite, and the tailings are the gangue mineral talc;

[0011] (4) Flotation results: the concentrate product in step (3) is filtered and dried to obtain the copper concentrate with a copper grade of 22.19-27.46% and a recovery rate of 82.58-88.57%.

[0012] In step (1), the jaw crusher is used for crushing the raw ore, and the ceramic ball mill is used for grinding.

[0013] In step (2), the pH adjusting agent is a hydrochloric acid or sodium hydroxide solution with a concentration of 0.5%-1%, and the pulp pH is adjusted to 7.0-9.0.

[0014] In step (3), the rotation speed of the flotation machine is 1800-2000 r / min, and the bubble scraping time is 5 min.

[0015] In step (3), the dosages of the depressant Vylan glue, the collector butyl xanthate and the frother MIBC in the roughing operation are 120-160 g / t, 60-80 g / t and 40-60 g / t respectively, the dosages of the reagents in the scavenging operation are 80 g / t, 30-40 g / t and 20-30 g / t respectively, and only the depressant Vylan glue is added in the three cleaning operations, and the dosages of the reagent are 60-80 g / t, 30-40 g / t and 15-20 g / t respectively. All the reagents are added to the pulp in the form of aqueous solution.

[0016] The mechanism of the present application is as follows:

[0017] The chemical structure of the wilgeum gum contains carboxyl functional groups, which can chemically react with magnesium ions on the surface of the talc and be adsorbed on the surface of the talc. In addition, the wilgeum gum contains a large number of hydroxyl groups, which can interact with silicon atoms and oxygen atoms in the talc in the form of hydrogen bonds. The carboxyl and hydroxyl groups on the surface of the talc are hydrophilic groups, which form a hydrophilic layer after being adsorbed on the surface of the talc, change the hydrophobicity of the talc, make the talc hydrophilic and prevent the particles from being captured by the bubbles, so as to achieve the purpose of inhibition. The hydrophilic groups in the wilgeum gum interact weakly with the metal ions on the surface of the chalcopyrite, that is, the wilgeum gum has little effect on the floatability of the chalcopyrite. Therefore, the addition of the wilgeum gum can effectively realize the flotation separation of the chalcopyrite and the talc.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] The wilgeum gum is used as the inhibitor in the present application, the wilgeum gum is adsorbed on the surface of the silicate mineral talc to form a hydrophilic layer, change the hydrophobicity of the talc and play an inhibiting role, so as to achieve the effect of flotation separation of the chalcopyrite and the talc. At the same time, the wilgeum gum is a biological polymer fermented from natural raw materials, which is non-toxic and has good environmental friendliness and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The present application is a process flow diagram. DETAILED DESCRIPTION

[0021] The present application will be further described below by means of the accompanying drawings and examples.

[0022] Example 1: In this embodiment, the flotation separation test of chalcopyrite and talc in a certain place in China is carried out, the content of chalcopyrite in the raw ore is 2.35%, and the content of talc is 5.11%.

[0023] The inhibitor of this embodiment is wilgeum gum. The wilgeum gum is used as a talc inhibitor for the flotation separation of chalcopyrite and talc. As shown in the figure, the specific steps are as follows: Figure 1

[0024] (1) crushing and grinding: the raw ore is crushed to less than 2mm by a jaw crusher, and then ground to a particle size of less than 74μm by 80% by a ceramic ball mill;

[0025] (2) slurry preparation: the ground ore in step (1) is placed in a flotation tank, water is added and the concentration of the ore slurry is adjusted to 33%, a uniform ore slurry is obtained, and then a 1% sodium hydroxide solution is used to adjust the pH value of the ore slurry to 7.0;

[0026] ​(3) Flotation: the slurry with adjusted pH in step (2) is subjected to one roughing, one scavenging and three cleaning operations, specifically: one roughing to obtain a roughing concentrate and a roughing tailing, then the roughing tailing is subjected to one scavenging, and the roughing concentrate is subjected to three cleanings, and the middlings are sequentially returned to the closed-circuit flotation process, wherein all reagents except the pH adjusting agent are added in the scavenging process, and only the depressant is added in the cleaning process. In the roughing operation, the depressant islan 120 g / t, the collector is butyl xanthate 80 g / t, and the frother is MIBC 50 g / t, and the addition time interval of each reagent is 5 min, the flotation machine speed is 1900 r / min, and the scraping time is 5 min, then air flotation is carried out, to obtain the roughing concentrate and the roughing tailing; the obtained roughing tailing is subjected to scavenging operation, and the reagent dosage of the scavenging operation is half of that of the roughing operation; the roughing concentrate obtained in the roughing operation is subjected to one cleaning operation, and the dosage of the depressant is 60 g / t, the tailings obtained in the first cleaning are combined with the scavenging concentrate obtained in the scavenging to return to the roughing operation, forming a closed loop; the one cleaning product is subjected to two cleanings, and the dosage of the depressant is 30 g / t, the tailings obtained in the second cleaning return to the first cleaning, forming a closed loop; the two cleaning product is subjected to three cleanings, and the dosage of the depressant is 15 g / t, and the tailings of the third cleaning return to the second cleaning, forming a closed loop;

[0027] (4) Product processing: the tailings of the scavenging operation are the final tailings product, and the concentrate of the third cleaning operation is the final concentrate product, and the concentrate product is the target mineral copper concentrate, with a grade of 24.21% and a recovery rate of 86.43%.

[0028] Example 2: The flotation separation test of chalcopyrite and talc in a certain domestic place is carried out, and the chalcopyrite content in the raw ore is 2.06%, and the talc content is 4.31%.

[0029] (1) Crushing and grinding: the raw ore is crushed to less than 2 mm by a jaw crusher, and then ground to a particle size of less than 74 μm of 82% by a ceramic ball mill;

[0030] (2) Slurry preparation: the ground ore in step (1) is placed in a flotation machine, water is added, and the slurry concentration is adjusted to 30%, to obtain a uniform slurry, and then a 1% pH adjusting agent sodium hydroxide solution is used to adjust the pH value of the slurry to 8.0;

[0031] (3) Flotation: the slurry with adjusted pH in step (2) is subjected to one roughing, one scavenging and three cleaning operations, specifically: one roughing to obtain a roughing concentrate and a roughing tailing, then the roughing tailing is subjected to one scavenging, and the roughing concentrate is subjected to three cleanings, and the middlings are sequentially returned to the closed-circuit flotation process, wherein all reagents except the pH adjusting agent are added in the scavenging process, and only the depressant is added in the cleaning process. In the roughing operation, the depressant islan 160 g / t, the collector is butyl xanthate 70 g / t, and the frother is MIBC 60 g / t, and the addition time interval of each reagent is 4 min, the flotation machine speed is 2000 r / min, and the scraping time is 5 min, then air flotation is carried out, to obtain the roughing concentrate and the roughing tailing; the obtained roughing tailing is subjected to scavenging operation, and the reagent dosage of the scavenging operation is half of that of the roughing operation; the roughing concentrate obtained in the roughing operation is subjected to one cleaning operation, and the dosage of the depressant is 80 g / t, the cleaning tailing obtained in the first cleaning is combined with the scavenging concentrate obtained in the scavenging to return to the roughing operation, to form a closed-circuit cycle; the one cleaning concentrate is subjected to two cleanings, and the dosage of the depressant is 40 g / t, the cleaning tailing obtained in the second cleaning returns to the first cleaning, to form a closed-circuit cycle; the two cleaning concentrate is subjected to three cleanings, and the dosage of the depressant is 20 g / t, and the cleaning tailing of the third cleaning returns to the second cleaning, to form a closed-circuit cycle;

[0032] (4) Product processing: the scavenging tailing of the scavenging operation is the final tailing product, and the concentrate of the third cleaning operation is the final concentrate product, and the concentrate product is the target mineral copper concentrate, with a grade of 27.46% and a recovery rate of 82.58%.

[0033] Example 3: The flotation separation test of chalcopyrite and talc in a certain domestic place is carried out according to the embodiment, and the chalcopyrite content in the raw ore is 1.76%, and the talc content is 3.54%.

[0034] (1) Crushing and grinding: the raw ore is crushed to less than 2 mm by a jaw crusher, and then ground to a particle size of less than 74 μm by 85% by a ceramic ball mill;

[0035] (2) Slurry preparation: the ground ore in step (1) is placed in a flotation machine, water is added, and the slurry concentration is adjusted to 35%, to obtain a uniform slurry, and then a 1% pH adjusting agent sodium hydroxide solution is used to adjust the pH value of the slurry to 9.0;

[0036] (3) Flotation: the slurry with adjusted pH in step (2) is subjected to one roughing, one scavenging and three cleaning operations, specifically: one roughing to obtain a roughing concentrate and a roughing tailing, then the roughing tailing is subjected to one scavenging, and the roughing concentrate is subjected to three cleanings, and middlings are sequentially returned to the closed-circuit flotation process, wherein all reagents except the pH adjusting agent are added in the scavenging process, and only the depressant is added in the cleaning process. In the roughing operation, the depressant is added in the order of 140 g / t of Vian gum, 60 g / t of butyl xanthate as the collector and 40 g / t of MIBC as the frother, the time interval for adding each reagent is 3 min, the rotation speed of the flotation machine is 1800 r / min, and the scraping time is 5 min, then aeration flotation is performed to obtain the roughing concentrate and the roughing tailing; the obtained roughing tailing is subjected to the scavenging operation, and the reagent dosage in the scavenging operation is half of that in the roughing operation; the roughing concentrate obtained in the roughing operation is subjected to one cleaning operation, and the dosage of the depressant is 70 g / t, the tailings obtained in the first cleaning are combined with the scavenging concentrate obtained in the scavenging to return to the roughing operation to form a closed-circuit cycle; the one cleaning concentrate is subjected to two cleanings, and the dosage of the depressant is 35 g / t, the tailings obtained in the second cleaning are returned to the first cleaning to form a closed-circuit cycle; the two cleaning concentrate is subjected to three cleanings, and the dosage of the depressant is 18 g / t, and the tailings obtained in the third cleaning are returned to the second cleaning to form a closed-circuit cycle;

[0037] (4) Product processing: the tailings of the scavenging operation are the final tailing product, and the concentrate of the third cleaning operation is the final concentrate product, and the concentrate product is the target mineral copper concentrate, and the grade is 22.19% and the recovery rate is 88.57%.

[0038] The specific embodiments of the present application are described in detail above in combination with the drawings, and the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solution falling within the concept of the present application falls within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the technical field, some improvements and refinements without departing from the principle of the present application should be regarded as the protection scope of the present application.

Claims

1. An application of an inhibitor for flotation separation of talc and chalcopyrite, characterized in that: The inhibitor is welan gum, which is used as a talc inhibitor for flotation separation of talc and chalcopyrite. The specific steps are as follows: (1) Crushing and grinding: crush the raw ore to less than 2 mm, and grind the mineral particles to -74 μm, accounting for 80~85%; (2) Slurry adjustment: Place the ore pulp after grinding in step (1) in a flotation tank, add water to adjust the ore pulp concentration to 30-35% to obtain a uniform ore pulp, and then adjust the ore pulp pH value to 7.0-9.0 with a pH adjuster. The pH adjuster is a hydrochloric acid or sodium hydroxide solution with a concentration of 0.5%-1%; (3) Flotation: The slurry with pH adjusted in step (2) is subjected to one roughing operation, one scavenging operation, and three concentrating operations. In the roughing operation, the inhibitor welan gum, the collector butyl xanthate, and the foaming agent MIBC are added in sequence. After adding each agent, they are stirred for 3 to 5 minutes, and then aerated flotation is performed. The amount of agents used in the scavenging operation is half of that in the roughing operation. The inhibitor welan gum is added in the concentrating operation. The talc and chalcopyrite are separated by flotation to obtain concentrate and tailings. The concentrate is the target mineral chalcopyrite, and the tailings are the gangue mineral talc. For ore, the dosage of inhibitor welan gum, collector butyl xanthate and foaming agent MIBC in the roughing operation is 120-160g / t, 60-80g / t and 40-60g / t respectively; the dosage of reagents in the scavenging operation is 60-80g / t, 30-40g / t and 20-30g / t respectively; in the tertiary concentrating operation, only inhibitor welan gum is added, and the dosage of reagents is 60-80g / t, 30-40g / t and 15-20g / t respectively. All reagents are added to the slurry in the form of aqueous solutions. (4) Flotation results: After filtering and drying the concentrate product of step (3), a copper concentrate with a copper grade of 28.87-29.36% and a recovery rate of 87.99-88.57% can be obtained.

2. The use of the inhibitor for flotation separation of talc and chalcopyrite according to claim 1, characterized in that: In step (3), the flotation machine speed is 1800-2000 r / min, and the flotation scraping time is 5 min.

3. The use of the chalcopyrite and talc flotation separation inhibitor according to claim 1, characterized in that: Step (1) The raw ore is crushed using a jaw crusher and ground using a ceramic ball mill.

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