Method for separating chalcopyrite and arsenopyrite based on surface differentiation oxidation

Abstract

The invention discloses a method for separating chalcopyrite and arsenopyrite based on surface differentiation oxidation, which comprises the following steps: step 1, grinding chalcopyrite and arsenopyrite in a grinding machine, and then sieving; step 2, pouring into a flotation tank, adding deionized water, and stirring; thirdly, a pH adjusting agent, an oxidizing agent, a collecting agent and a foaming agent are sequentially added; fourthly, air inflation is conducted for flotation, the obtained foam product is chalcopyrite concentrate, and the product in the tank is arsenopyrite tailings; the invention relates to the technical field of mineral processing. According to the method for separating the chalcopyrite and the arsenopyrite based on surface differentiation oxidation, the surface of the arsenopyrite can be selectively oxidized by using an oxidizing agent under the condition that a traditional inhibitor is not used, the inhibition effect on the arsenopyrite is remarkable, the flotation separation effect is improved, separation of the two minerals is achieved, and the method has the advantages of being green, environmentally friendly and low in cost; the process is simple, and the effect is remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, and in particular to a method for separating chalcopyrite and arsenopyrite based on surface differential oxidation. Background Art

[0002] Copper is an important nonferrous metal, widely used in chemical, construction, aerospace and other fields. Arsenic is toxic and mainly exists in the ore in the form of arsenopyrite, which not only pollutes the atmospheric environment, but also causes health problems for humans and animals. Especially when separating chalcopyrite from arsenopyrite, arsenic is easily enriched in the concentrate, which is extremely unfavorable for subsequent smelting. Arsenopyrite often coexists with chalcopyrite, and the two have similar flotation properties, so successfully separating chalcopyrite from arsenopyrite is a challenging research task.

[0003] In industrial practice, the separation of chalcopyrite and arsenopyrite usually involves the use of inhibitors to suppress arsenopyrite and the flotation of chalcopyrite. In the flotation, inorganic agents such as lime, sodium sulfite, and calcium hypochlorite are often used to suppress arsenopyrite and flot chalcopyrite. This method not only has the problem of large dosage, but also is carried out in a highly alkaline environment, with high reagent costs and difficult wastewater treatment. Most organic inhibitors also have the problem of large dosage and high reagent costs.

[0004] A Chinese patent with publication number CN114904660A discloses an arsenopyrite flotation inhibitor, its application, and a flotation separation method for arsenopyrite and chalcopyrite. The arsenopyrite flotation inhibitor is hexamethylenediaminetetramethylenephosphonic acid or its aqueous solution. Hexamethylenediaminetetramethylenephosphonic acid has a large number of hydrophilic phosphonic acid groups. The phosphonic acid groups of the molecule can chelate with the iron ions on the surface of arsenopyrite to form PO-Fe bonds, so that the inhibitor is adsorbed on the surface of arsenopyrite in large quantities, and at the same time, the hydrophilic groups are exposed to the aqueous solution so that the hydrophilicity of the mineral surface is suppressed, thereby reducing the floating rate of arsenopyrite. However, the flotation effect of the above technical solution needs to be further improved; to this end, the present invention provides a method for separating chalcopyrite and arsenopyrite based on surface differential oxidation to solve the above problems. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the present invention provides a method for separating chalcopyrite and arsenopyrite based on surface differential oxidation, which solves the problems mentioned in the above background technology.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented by the following technical scheme: a method for separating chalcopyrite and arsenopyrite based on surface differential oxidation, comprising the following steps:

[0009] Step 1, grind chalcopyrite and arsenopyrite in a grinder, and then sieve;

[0010] Step 2: Pour into the flotation tank, add deionized water and stir;

[0011] Step 3, adding a pH adjuster, an oxidant, a collector and a frother in sequence;

[0012] Step 4: aerate for flotation, and the obtained foam product is chalcopyrite concentrate, and the product in the tank is arsenopyrite tailings.

[0013] Preferably, the pH adjuster is sodium hydroxide and hydrochloric acid, and the pH adjustment range is 7-9.

[0014] Preferably, the oxidant is one of the percarbonate salts and is added as a solution of 8 g / L, and the amount of the oxidant added is 200-500 mg / L.

[0015] Preferably, the added amount of the collector is 10 to 30 mg / L.

[0016] Preferably, in step three, the collector is at least one of potassium butyl xanthate and sodium butyl xanthate.

[0017] Preferably, the foaming agent is MIBC, and the added amount of the foaming agent is 10 to 30 mg / L.

[0018] Preferably, in the step 1, chalcopyrite and arsenopyrite are sieved through a 160-200 mesh sieve; and the mass ratio of the mixed ore of chalcopyrite and arsenopyrite to deionized water is 1:(30-40).

[0019] Preferably, in step 1, the mass ratio of chalcopyrite to arsenopyrite is 1:(1-3).

[0020] (III) Beneficial effects

[0021] The present invention provides a method for separating chalcopyrite and arsenopyrite based on surface differential oxidation. Compared with the prior art, the method has the following beneficial effects: in the method for separating chalcopyrite and arsenopyrite based on surface differential oxidation, percarbonate is a selective oxidant, which can selectively oxidize the surface of arsenopyrite, so that Fe(II)-AsS and AsS2 on the surface are oxidized into Fe(III)-O / OH, FeAsO4, Fe2(SO4)3 and other hydrophilic substances and inhibited, while the inhibitory effect of percarbonate on chalcopyrite is relatively weak, and its surface will not be strongly oxidized, and good hydrophobicity is maintained, so that chalcopyrite and arsenopyrite can be separated by flotation.

[0022] In summary, the present invention can selectively oxidize the surface of arsenopyrite by using an oxidant without using a traditional inhibitor, and has a significant inhibitory effect on arsenopyrite, thereby improving the flotation separation effect and realizing the separation of the two minerals. It has the characteristics of being green, environmentally friendly, and low in cost, and the process is simple and the effect is significant. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1

[0025] A method for separating chalcopyrite and arsenopyrite based on surface differential oxidation comprises the following steps:

[0026] Step 1, grind chalcopyrite and arsenopyrite in a grinder respectively, and then pass through a 200-mesh sieve;

[0027] Step 2: Pour the ground chalcopyrite and arsenopyrite into a flotation tank in a weight ratio of 1:1, add 40 mL of deionized water, and stir for 1 min;

[0028] Step 3, adding pH adjuster sodium hydroxide to adjust the pH to 7;

[0029] Step 4: prepare a solution of 8 g / L sodium percarbonate, then add 400 mg / L sodium percarbonate solution to the solution in step 3 and stir for 3 min;

[0030] Step 5: Add 30 mg / L potassium butyl xanthate and stir for 2 min, then add 30 mg / L MIBC and continue stirring for 1 min;

[0031] Step 6: aerate for flotation, and the foam product is chalcopyrite concentrate, and the product in the tank is arsenopyrite tailings.

[0032] Example 2

[0033] A method for separating chalcopyrite and arsenopyrite based on surface differential oxidation comprises the following steps:

[0034] Step 1, grind chalcopyrite and arsenopyrite in a grinder respectively, and then pass through a 160-mesh sieve;

[0035] Step 2: Pour the ground chalcopyrite and arsenopyrite into a flotation tank in a weight ratio of 1:3, add 40 mL of deionized water, and stir for 1 min;

[0036] Step 3, adding a pH adjuster such as sodium hydroxide or hydrochloric acid to adjust the pH to 8;

[0037] Step 4: prepare a solution of 8 g / L sodium percarbonate, then add 500 mg / L sodium percarbonate solution to the solution in step 3 and stir for 3 min;

[0038] Step 5: Add 20 mg / L potassium butyl xanthate and stir for 2 minutes, then add 20 mg / L MIBC and continue stirring for 1 minute;

[0039] Step 6: aerate for flotation, and the foam product is chalcopyrite concentrate, and the product in the tank is arsenopyrite tailings.

[0040] Comparative Example 1

[0041] Compared with Example 1, the inhibitor in Example 1 is replaced by lime.

[0042] Table 1 Flotation separation results

[0043]

[0044]

[0045] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for separating chalcopyrite and arsenopyrite based on surface differential oxidation, characterized in that: The following steps are involved: Step 1, grind chalcopyrite and arsenopyrite in a grinder, and then sieve; Step 2: Pour into the flotation tank, add deionized water and stir; Step 3, adding a pH adjuster, an oxidant, a collector and a frother in sequence; Step 4: aerate for flotation, and the obtained foam product is chalcopyrite concentrate, and the product in the tank is arsenopyrite tailings.

2. The method for separating chalcopyrite and arsenopyrite based on surface differential oxidation according to claim 1, characterized in that: In the step 1, the fineness of chalcopyrite and arsenopyrite is ground to less than 0.074 mm.

3. The method for separating chalcopyrite and arsenopyrite based on surface differential oxidation according to claim 1, characterized in that: The oxidant is one of percarbonate salts and is added as a solution of 8 g / L. The added amount of the oxidant is 200-500 mg / L.

4. The method for separating chalcopyrite and arsenopyrite based on surface differential oxidation according to claim 1, characterized in that: The added amount of the collector is 10 to 30 mg / L.

5. The method for separating chalcopyrite and arsenopyrite based on surface differential oxidation according to claim 1, characterized in that: In the step three, the collector is at least one of potassium butyl xanthate and sodium butyl xanthate.

6. The method for separating chalcopyrite and arsenopyrite based on surface differential oxidation according to claim 1, characterized in that: The foaming agent is MIBC, and the added amount of the foaming agent is 10 to 30 mg / L.

7. The method for separating chalcopyrite and arsenopyrite based on surface differential oxidation according to claim 1, characterized in that: In the step 1, chalcopyrite and arsenopyrite are sieved through a 160-200 mesh sieve; the mass ratio of the mixed ore of chalcopyrite and arsenopyrite to deionized water is 1:(30-40).

8. The method for separating chalcopyrite and arsenopyrite based on surface differential oxidation according to claim 1, characterized in that: In the step 1, the mass ratio of chalcopyrite to arsenopyrite is 1:(1-3).

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