A depressor for improving flotation indexes of talc-type copper sulfide ore, preparation method and application thereof

Abstract

The application discloses a kind of inhibitor for improving talc type copper sulphide ore flotation index, preparation method and application, it is related to sulphide copper ore flotation technical field.Tannic acid and water glass are respectively configured into solution, and are fully mixed by stirring to obtain inhibitor.Talc type sulphide copper ore is carried out grinding operation, then inhibitor is added to grinding product, so that grinding product is reacted with it, then butyl xanthate and No.2 oil are added, finally roughing is carried out to obtain copper rough concentrate and roughing tailings;Copper rough concentrate and roughing tailings are respectively carried out concentration and scavenging operation, and inhibitor is added in concentration operation, and butyl xanthate and No.2 oil are added in scavenging operation.Tannic acid and water glass are mixed after tannic acid and water glass are mixed, and are used as talc inhibitor for the separation of talc and sulphide copper ore.This method has the advantages of simple operation, low reagent consumption and strong selectivity, and can realize efficient separation of talc and sulphide copper under the condition of low dosage of inhibitor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of copper sulfide ore flotation, in particular to a depressant for improving the flotation index of talc-type copper sulfide ore, a preparation method and application thereof. BACKGROUND

[0002] Talc is a kind of layered structure mineral with obvious end face and base face. The base face is a non-polar surface, showing strong hydrophobicity, while the end face exposes MgOH + showing hydrophilicity, and the content of talc base face is much higher than that of end face, thus making the whole talc show very good floatability. Talc-containing copper sulfide ore is an important copper ore resource. In order to realize the selective separation between copper sulfide and talc with good floatability, the modification of mineral surface by using flotation reagents to expand the difference between the surface properties of the two is a common method for separating talc and copper sulfide ore.

[0003] In addition, talc has very small Mohs hardness, and a large amount of fine mud is easily produced in grinding, greatly increasing the dosage of flotation reagents and deteriorating the flotation environment, resulting in a large amount of talc entering the copper concentrate, causing the magnesium content of the copper concentrate to exceed the standard, and being not conducive to subsequent smelting operations. Therefore, it is very important to realize efficient separation of talc and copper sulfide in the beneficiation process.

[0004] At present, the separation of talc and chalcopyrite generally adopts the separation process of depressing talc and floating chalcopyrite. The inorganic depressants for talc mainly include water glass, zinc sulfate, aluminum sulfate, etc., and the organic depressants include carboxymethyl cellulose, guar gum, polyacrylamide, etc. The organic depressants are usually difficult to dissolve in water, which is not convenient for on-site operation, while the inorganic depressants, such as water glass, are commonly used to depress talc. However, a large amount of water glass is often needed to depress talc on site. In order to enhance the depressing effect of water glass, the water glass is simply modified by the beneficiation workers, i.e. the water glass is pre-mixed with acid or inorganic salt to obtain so-called acidified water glass and salted water glass. The depressing effect of the modified water glass on talc is significantly enhanced, but it also affects the floating of the target mineral.

[0005] Chinese invention patent "Method for separating copper sulfide mineral from talc by flotation", patent number CN103008113A, reports that the addition of aluminum chloride can enhance the depressing effect of carboxymethyl cellulose on talc, and the depressing effect on talc in the examples is better than that of tannin acid and water glass. However, in the examples of the patent, only tannin acid and water glass are added, and both of them have a depressing effect on talc, and the depressing performance of tannin acid and water glass on talc is not further enhanced by other technical means.

[0006] The Chinese invention patent "A method for reducing magnesium in talc type copper sulfide nickel ore flotation", patent number CN110280396A, in order to strengthen the inhibitory effect of carboxymethyl cellulose on talc, citric acid and water glass are added to prepare acidified water glass, citric acid has no inhibitory effect on talc, this technical solution only promotes the selectivity of carboxymethyl cellulose inhibitor, and does not improve the selectivity of water glass, and after acidification of water glass, a large amount of silicic acid colloid is generated, the inhibitory performance is enhanced, and the selectivity is reduced. Therefore, it is of great significance to develop a talc inhibitor with high selectivity and strong on-site operability. SUMMARY

[0007] The purpose of the present application is to provide an inhibitor for improving the flotation index of talc type copper sulfide ore, a preparation method and application, to solve the problems of unsatisfactory flotation effect and large amount of existing inhibitors.

[0008] To solve the above technical problems, the following technical scheme is adopted: an inhibitor for improving the flotation index of talc type copper sulfide ore, characterized in that: the inhibitor is acidified water glass prepared by mixing tannic acid and water glass.

[0009] A further technical solution is that the preparation method of the inhibitor is: tannic acid and water glass are respectively prepared into solutions with a concentration of 1% and 3%, then the two are introduced into a stirring barrel, stirred for 15 min, and fully mixed to obtain the inhibitor.

[0010] A further technical solution is that the volume ratio of tannic acid solution in the inhibitor is 1 / 4-1 / 2.

[0011] A further technical solution is that the inhibitor is used for talc type copper sulfide ore flotation.

[0012] A further technical solution is that the specific steps of the talc type copper sulfide ore flotation are as follows:

[0013] S1. Grinding operation is performed on the talc type copper sulfide ore, so that the content of the grinding product is 73.25-85.62% of -0.074mm;

[0014] S2. 100g / t-200g / t of the inhibitor is added to the grinding product, so that the grinding product acts for 6 min, then butyl xanthate and No. 2 oil are added respectively, and finally roughing is performed to obtain copper rough concentrate and roughing tailings;

[0015] S3. The copper rough concentrate and the roughing tailings in S2 are respectively subjected to cleaning and scavenging operations, and the inhibitor is added in the cleaning operation, and butyl xanthate and No. 2 oil are added in the scavenging operation.

[0016] A further technical solution is that the pH value of the ore slurry before adding the inhibitor after grinding is controlled at 5-8.

[0017] Further technical solutions are that the dosage of the depressant in the selective concentration, the dosage of butyl xanthate in the scavenging concentration and the dosage of No.2 oil are all half of the dosage in the rough concentration.

[0018] Further technical solutions are that the middlings of the selective concentration and the scavenging concentration are returned to the previous process in turn.

[0019] Working mechanism: in the depressant prepared by mixing tannic acid and water glass, tannic acid contains a large number of phenolic hydroxyl groups, which can selectively bond with magnesium exposed on the end surface of talc, and has good inhibition performance on talc, and tannic acid is easily soluble in water, the H + of the phenolic hydroxyl groups in tannic acid can react with SiO3 2- in water glass to generate H2SiO3 which has strong inhibition on gangue minerals, further strengthening the inhibition effect of water glass, and the tannic acid acidified water glass acts on the magnesium and silicon sites on the surface of talc at the same time, effectively increasing the adsorption density of the depressant, and can greatly improve the separation index of talc type copper sulfide ore.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] 1. The tannic acid acidified water glass obtained by mixing tannic acid and water glass is used as a talc depressant for the separation of talc and copper sulfide ore. This method has the advantages of simple operation, low reagent dosage and strong selectivity, and can realize efficient separation of talc and copper sulfide under the condition of low dosage of depressant.

[0022] 2. Tannic acid is derived from plant bodies, has abundant resources, wide sources and low cost, and can effectively reduce the on-site production cost. Tannic acid is easily soluble in water, and the tannic acid acidified water glass obtained by mixing tannic acid and water glass has higher selectivity than traditional acidified water glass, greatly reduces the dosage of water glass, and is easy to operate, which can simplify the production process and facilitate large-scale application in the concentrator. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The process flowchart of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application clearer, the application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0025] Example 1

[0026] The ore sample used in this embodiment is a talc-containing sulfide copper ore in Xinjiang, the copper ore is mainly chalcopyrite and contains a small amount of tetrahedrite, and the gangue minerals are talc, quartz, serpentine and chlorite, etc. The specific steps are as follows:

[0027] S1, grinding operation is performed on the talc-containing sulfide copper ore, so that the content of -0.074 mm in the grinding product is 85.62%;

[0028] S2, tannic acid and water glass are respectively prepared into solutions with concentrations of 1% and 3%, then the two are introduced into a stirring barrel, and stirred for 15 min to fully mix;

[0029] S3, 110 g / t of acidified water glass composed of tannic acid and water glass in S2 is added to the grinding product, so that the grinding product acts for 6 min, the pH of the flotation slurry before the addition of tannic acid and acidified water glass is controlled at 6-7, then 110 g / t of butyl xanthate and 24 g / t of No. 2 oil are added, and finally roughing is performed to obtain copper rough concentrate and roughing tailings;

[0030] S4, the copper rough concentrate and the roughing tailings in S3 are respectively subjected to cleaning and scavenging operations, and tannic acid and acidified water glass prepared in S2 are added in the cleaning operation, before the addition of tannic acid and acidified water glass, the pH of the slurry is controlled at 6-7, and butyl xanthate and No. 2 oil are added in the scavenging operation. The dosage of tannic acid and acidified water glass in cleaning, and the dosage of butyl xanthate and No. 2 oil in scavenging are all halved based on the previous operation, and the middlings generated in cleaning and scavenging are returned to the previous operation in turn.

[0031] The selection index results obtained by the method of the present application in Example 1 are shown in Table 1.

[0032] Table 1: Selection index results of Example 1

[0033] Product name Yield / % Copper grade / % Copper recovery / % Concentrate 1.25 21.86 84.70 Tails 98.75 0.05 15.30 Run-of-mine 100.00 0.32 100.00

[0034] Example 2

[0035] The ore sample used in this embodiment is a talc-containing sulfide copper ore in Anhui, the copper ore is mainly chalcopyrite, and the gangue minerals are talc, quartz, serpentine and garnet, etc. The specific steps are as follows:

[0036] S1, grinding operation is performed on the talc-containing sulfide copper ore, so that the content of -0.074 mm in the grinding product is 81.97%;

[0037] S2, tannic acid and water glass are respectively prepared into solutions with concentrations of 1% and 3%, then the two are introduced into a stirring barrel, and stirred for 15 min to fully mix;

[0038] S3, adding the tannin acidified water glass in S2 into the grinding product to form acidified water glass 130g / t, and making the grinding product react with the acidified water glass for 6min, adjusting the pH of the flotation slurry before the addition of the tannin acidified water glass to 7, then adding butyl xanthate 80g / t and No.2 oil 18g / t respectively, and finally performing roughing to obtain copper rough concentrate and roughing tailings;

[0039] S4, performing cleaning and scavenging operations on the copper rough concentrate and the roughing tailings in S3 respectively, and adding the tannin acidified water glass prepared in S2 in the cleaning operation, controlling the pH of the slurry to be near 7 before the addition of the tannin acidified water glass, and adding butyl xanthate and No.2 oil in the scavenging operation. The dosage of the tannin acidified water glass in the cleaning operation and the dosages of butyl xanthate and No.2 oil in the scavenging operation are all halved based on the previous operation, and the middlings generated in the cleaning and scavenging operations are returned to the previous operation in turn.

[0040] The obtained beneficiation indexes in Example 2 are shown in Table 2.

[0041] Table 2: Beneficiation index results in Example 2

[0042] Product name Yield / % Copper grade / % Copper recovery / % Concentrate 2.52 26.38 87.21 Tails 97.48 0.10 12.79 Feed 100.00 0.76 100.00

[0043] Example 3

[0044] The ore sample used in this example is a talc-containing sulfide copper ore in Yunnan, and the copper ore is mainly chalcopyrite, with talc, quartz, serpentine and garnet as gangue minerals. The specific steps are as follows:

[0045] S1, performing grinding operation on the talc-containing sulfide copper ore, so that the content of-0.074mm in the grinding product is 73.25%;

[0046] S2, preparing tannin and water glass into solutions with concentrations of 1% and 3% respectively, then introducing both of them into a stirring barrel and stirring for 15min to make them fully mixed;

[0047] S3, adding the tannin acidified water glass in S2 into the grinding product to form acidified water glass 180g / t, and making the grinding product react with the acidified water glass for 6min, controlling the pH of the flotation slurry before the addition of the tannin acidified water glass to be 7-8, then adding butyl xanthate 100g / t and No.2 oil 20g / t respectively, and finally performing roughing to obtain copper rough concentrate and roughing tailings;

[0048] S4 carries out the cleaning and scavenging operations on the copper rough concentrate and roughing tailings in S3 respectively, and adds the tannin acidified sodium silicate prepared in S2 in the cleaning operation, before adding the tannin acidified sodium silicate, the pulp pH is controlled at 7-8, and butyl xanthate and No. 2 oil are added in the scavenging operation. The dosage of the tannin acidified sodium silicate in the cleaning operation and the dosage of butyl xanthate and No. 2 oil in the scavenging operation are all halved based on the previous operation, and the middlings generated in the cleaning and scavenging operations are returned to the previous operation in turn.

[0049] The separation indexes of the obtained products in Example 3 are shown in Table 3.

[0050] Table 3: Separation indexes of the products in Example 3

[0051] Product name Yield / % Copper grade / % Copper recovery / % Concentrate 1.85 24.74 85.36 Tails 98.15 0.08 14.64 Feed Product name Yield / % Copper grade / % Copper recovery / % Concentrate Tails Feed 100.00 0.54 100.00

[0052] The acidified sodium silicate obtained by mixing tannin acid and sodium silicate is used as the talc inhibitor in the present application, which not only strengthens the inhibition performance of the sodium silicate, but also increases the selectivity of the acidified sodium silicate, so that the selective separation of talc and copper sulfide can be realized at a low dosage.

[0053] Finally, it should be noted that the above-described examples are preferred embodiments of the present application, and are intended to provide a detailed description of the present application. Any modification or improvement to the technical solutions of the present application made by those skilled in the art without departing from the principles set forth in the present application shall be considered as falling within the protection scope of the present application.

Claims

1. A depressant for improving the flotation index of a talc-type copper sulfide ore, characterized by: The inhibitor is acidified water glass prepared by mixing tannic acid and water glass; the tannic acid and water glass are respectively prepared into solutions with concentrations of 1% and 3%, and then stirred; the volume ratio of the tannic acid solution in the inhibitor is 1 / 4-1 / 2; and the inhibitor is used for the flotation of the talc-type copper sulfide ore.

2. The depressant for improving the flotation indexes of talc-type copper sulfide ores according to claim 1, characterized in that: The preparation method of the inhibitor is as follows: the tannic acid and water glass are respectively prepared into solutions with concentrations of 1% and 3%, and then introduced into a stirring barrel, and stirred for 15 min to fully mix and obtain the inhibitor.

3. The depressant for improving the flotation indexes of talc-type copper sulfide ores according to claim 1, characterized in that: The specific steps of the flotation of the talc-type copper sulfide ore are as follows: S1. Grinding the talc-type copper sulfide ore to make the content of the ground product with a particle size of-0.074 mm be 73.25-85.62%; S2. Adding the inhibitor 100 g / t-200 g / t to the ground product to make the ground product act with the inhibitor for 6 min, then adding butyl xanthate and No. 2 oil, and finally performing roughing to obtain copper rough concentrate and roughing tailings; S3. Performing cleaning and scavenging operations on the copper rough concentrate and the roughing tailings in S2 respectively, and adding the inhibitor in the cleaning operation and adding butyl xanthate and No. 2 oil in the scavenging operation.

4. The depressant for improving the flotation indexes of talc-type copper sulfide ores according to claim 3, characterized in that: The pH value of the slurry before adding the inhibitor after the grinding is controlled to be 5-8.

5. The depressant for improving the flotation indexes of talc-type copper sulfide ores according to claim 3, characterized in that: The dosages of the inhibitor in the cleaning operation and butyl xanthate and No. 2 oil in the scavenging operation are all half of the dosages in the roughing operation.

6. The depressant for improving the flotation indexes of talc-type copper sulfide ores according to claim 3, characterized in that: The middlings in the cleaning and scavenging operations are returned to the previous operation process in turn.

Images