Recycling method of grinding material containing cutting agent

Abstract

The invention discloses a recycling method of a grinding material containing a cutting agent. The recycling method comprises the following steps: obtaining the grinding material containing the cutting agent; the grinding material containing the cutting agent is added into acid liquor, chlorine is introduced, cobalt impurities in the grinding material containing the cutting agent are dissolved, and a cobalt-containing solution and tungsten carbide powder are obtained. The grinding material containing the cutting agent is added into the acid liquor, chlorine is introduced, the chlorine can quickly oxidize cobalt into cobalt ions, the electrode potential of the cobalt is reduced through the reaction, and the cobalt is easier to dissolve. Cobalt ions and chloride ions are combined to form cobalt chloride, so that the solubility of cobalt is increased, and the reaction rate is increased. The addition of chlorine can promote the dissolution process of cobalt in the acid liquor, shorten the dissolution time of cobalt and improve the overall efficiency of the reaction.

Description

Technical Field

[0001] The invention relates to the technical field of conversion and utilization of waste cemented carbide resources, and more specifically, to a method for recycling abrasive materials containing cutting agents. Background Art

[0002] Cemented carbide is a high-performance alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy. It is widely used in cutting tools, molds, wear-resistant parts and other fields.

[0003] Grinding material containing cutting agent is a type of waste cemented carbide, which contains a large amount of rare metal elements, such as cobalt and tungsten, which have high economic value. Through recycling, resources can be reused. The existing technology usually dissolves cobalt through acid leaching, but the dissolution rate is too slow, which takes about 5-7 days.

[0004] Therefore, there is an urgent need to provide a method for recycling cutting agent-containing grinding materials that can increase the cobalt dissolution rate. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and provide a method for recycling abrasive materials containing cutting agents, comprising the following steps:

[0006] S1. Obtaining a grinding material containing a cutting agent;

[0007] S2. Adding the cutting agent-containing grinding material into an acid solution and introducing chlorine gas to dissolve the cobalt impurities in the cutting agent-containing grinding material to obtain a cobalt-containing solution and tungsten carbide powder.

[0008] Implementing the embodiments of the present invention will have the following beneficial effects:

[0009] In this embodiment, a grinding material containing a cutting agent is added to an acid solution and chlorine is introduced to dissolve the cobalt impurities in the grinding material to obtain a cobalt-containing solution and tungsten carbide powder. Chlorine can quickly oxidize cobalt into cobalt ions. This reaction reduces the electrode potential of cobalt, making it easier to dissolve. Cobalt ions combine with chloride ions to form cobalt chloride, which increases the solubility of cobalt and thus accelerates the reaction rate. The addition of chlorine can promote the dissolution process of cobalt in acid solution, shorten the dissolution time of cobalt, and improve the overall efficiency of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] in:

[0012] Figure 1 A flow chart of a method for preparing tungsten oxide and recycling it from a grinding material containing a cutting agent provided by the present invention. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0014] Reference Figure 1 The present invention discloses a method for recycling abrasive materials containing cutting agents, comprising the following steps:

[0015] S1. Obtain a grinding material containing a cutting agent.

[0016] It should be noted that the grinding material containing cutting agent is cemented carbide powder, which can contact with the solvent more fully, accelerate the process of chemical reaction and improve the recovery efficiency.

[0017] S2. Adding abrasive materials containing cutting agents into an acid solution and introducing chlorine gas to dissolve cobalt impurities in the abrasive materials containing cutting agents to obtain a cobalt-containing solution and tungsten carbide powder.

[0018] It should be noted that when using cutting agent-containing grinding materials to recover cobalt elements, cobalt is usually dissolved by acid, but the rate of dissolving cobalt by adding only acid solution is slow, and it takes about 5-7 days. Optionally, the acid solution includes one or more of dilute hydrochloric acid, dilute sulfuric acid, and dilute nitric acid.

[0019] Furthermore, the acid solution is dilute hydrochloric acid. In this embodiment, chlorine gas is introduced while adding the acid solution to increase the cobalt dissolution rate.

[0020] The main reasons why chlorine accelerates the dissolution of cobalt metal include:

[0021] 1) High electron affinity: Chlorine gas (Cl2) can easily accept electrons to form chloride ions (Cl - ), chlorine can quickly oxidize cobalt (Co) to cobalt ions (Co 2+ ). This reaction lowers the electrode potential of the cobalt, making it more soluble.

[0022] Co(s)+Cl2(g)→Co 2+ (ag)+2C1 -

[0023] 2) Generate soluble compounds: The oxidized cobalt ions combine with the chloride ions in the hydrochloric acid to form cobalt chloride (CoCl2), which increases the solubility of cobalt and thus accelerates the reaction rate.

[0024] 3) Increase reaction rate: Chlorine can accelerate the reaction process, shorten the dissolution time of cobalt, and improve the overall efficiency of the reaction.

[0025] In the process of the reaction between hydrochloric acid and cobalt, the reaction process when chlorine is introduced can be divided into several steps:

[0026] 1) Dissolution of chlorine: Chlorine (Cl2) dissolves in hydrochloric acid (HCl) to form chloride ions (Cl - ) and free chlorine molecules.

[0027] Cl2(g)+H2O(l)→2HCl(aq)+Cl2(g)

[0028] 2) Cobalt oxidation reaction: Under the oxidation action of chlorine, cobalt (Co) is oxidized to cobalt ions (Co 2+ ) and reacts with chloride ions to form cobalt chloride (CoCl2).

[0029] Co(s)+2C1(aq)→CoCl2(aq)+2e -

[0030] 3) Cobalt chloride in hydrochloric acid forms: cobalt ions (Co 2+ ) combines with chloride ions in hydrochloric acid to further form cobalt chloride.

[0031] Co 2+ (ag)+2C1 - (aq)→CoCl2(aq)

[0032] Through the above steps, the oxidation reaction of cobalt is made faster, cobalt is more easily dissolved by hydrochloric acid, the overall reaction rate is improved, and the introduction of chlorine significantly promotes the dissolution process of cobalt in hydrochloric acid.

[0033] Furthermore, the concentration of the acid solution is 10g / L-40g / L; the flow rate of the chlorine gas is 0.1L / min-50L / min; and the mass ratio of the cutting agent-containing grinding material to the acid solution is 69.4:1-41.6:1.

[0034] Furthermore, the dissolution time is 12h-40h; and the dissolution temperature is 70°C-90°C.

[0035] It is understandable that the cutting agent-containing grinding material is a cemented carbide grinding material containing cobalt. Cemented carbide grinding materials containing cobalt are widely used in the field of mechanical processing, such as cutting, drilling, grinding and other processing processes. Cemented carbide grinding materials containing cobalt are mainly composed of carbides (such as tungsten carbide) and metal cobalt. The expensiveness and rarity of cemented carbide materials can be recycled through the recycling of grinding materials to achieve the recycling of resources.

[0036] In this embodiment, a grinding material containing a cutting agent is added to an acid solution and chlorine is introduced to dissolve the cobalt impurities in the grinding material to obtain a cobalt-containing solution and tungsten carbide powder. Chlorine can quickly oxidize cobalt into cobalt ions. This reaction reduces the electrode potential of cobalt, making it easier to dissolve. Cobalt ions combine with chloride ions in hydrochloric acid to form cobalt chloride, which increases the solubility of cobalt and thus accelerates the reaction rate. The addition of chlorine can promote the dissolution process of cobalt in hydrochloric acid, shorten the dissolution time of cobalt, and improve the overall efficiency of the reaction. Specific embodiment:

[0038] Embodiment 1:

[0039] A method for recycling abrasive materials containing cutting agents comprises the following steps:

[0040] S1. Obtaining a grinding material containing a cutting agent;

[0041] S2. Add 5% cobalt-containing cutting agent grinding material into 1500L of 40g / L hydrochloric acid and introduce chlorine gas at a flow rate of 50L / min and a temperature of 90°C. Dissolve for 13h to dissolve the cobalt impurities in the cutting agent grinding material to obtain a cobalt-containing solution and tungsten carbide powder.

[0042] Embodiment 2:

[0043] A method for recycling abrasive materials containing cutting agents comprises the following steps:

[0044] S1. Obtaining a grinding material containing a cutting agent;

[0045] S2. Add 6% cobalt-containing cutting agent grinding material into 900L of 25g / L hydrochloric acid and introduce chlorine gas at a flow rate of 25L / min and a temperature of 80°C. Dissolve for 20 hours to dissolve the cobalt impurities in the cutting agent grinding material to obtain a cobalt-containing solution and tungsten carbide powder.

[0046] Embodiment 3:

[0047] A method for recycling abrasive materials containing cutting agents comprises the following steps:

[0048] S1. Obtaining a grinding material containing a cutting agent;

[0049] S2. Add 8% cobalt-containing cutting agent grinding material into 225 ml of 10 g / L hydrochloric acid and introduce chlorine gas at a flow rate of 0.1 L / min and a temperature of 70°C. Dissolve for 30 hours to dissolve the cobalt impurities in the cutting agent grinding material to obtain a cobalt-containing solution and tungsten carbide powder.

[0050] Comparative Example:

[0051] A method for recycling abrasive materials containing cutting agents comprises the following steps:

[0052] S1. Obtaining a grinding material containing a cutting agent;

[0053] S2. Add 900 L of 25 g / L hydrochloric acid containing 6% cobalt into the cutting agent grinding material, dissolve it at 80° C. for 130 hours, and dissolve the cobalt impurities in the cutting agent grinding material to obtain a cobalt-containing solution and tungsten carbide powder.

[0054] Table 1: Cobalt dissolution rate table of Examples 1-3 and Comparative Examples

[0055] Cobalt dissolution rate Example 1 0.33％ / h Example 2 0.27％ / h Example 3 0.24％ / h Comparative Example 0.041％ / h

[0056] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for recycling abrasive materials containing cutting agents, characterized in that: The following steps are involved: S1. Obtaining a grinding material containing a cutting agent; S2. Adding the cutting agent-containing grinding material into an acid solution and introducing chlorine gas to dissolve the cobalt impurities in the cutting agent-containing grinding material to obtain a cobalt-containing solution and tungsten carbide powder.

2. The method for recycling abrasive materials containing cutting agents according to claim 1, characterized in that: The flow rate of the chlorine gas is 0.1L / min-50L / min.

3. The method for recycling abrasive materials containing cutting agents according to claim 2, characterized in that: The dissolution time in step S2 is 12h-40h.

4. The method for recycling abrasive materials containing cutting agents according to claim 3, characterized in that: The dissolving temperature in step S2 is 70°C-90°C.

5. The method for recycling abrasive materials containing cutting agents according to claim 1, characterized in that: The concentration of the acid solution is 10g / L-40g / L.

6. The method for recycling abrasive materials containing cutting agents according to claim 5, characterized in that: The mass ratio of the cutting agent-containing grinding material to the acid solution is 69.4:1-41.6:

1.

7. The method for recycling abrasive materials containing cutting agents according to claim 1, characterized in that: The acid solution includes one or two of dilute hydrochloric acid, dilute sulfuric acid, and dilute nitric acid.

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