Efficient combined flocculant for micro-fine high-talc-copper-cobalt ore and application method thereof

Abstract

The application discloses a kind of microfine high talc copper cobalt ore high-efficiency combined flocculants and its application method, according to weight parts, the high-efficiency combined flocculants includes: lime 180-220 parts, AN908 is 30-100 parts and guar gum 15-35 parts.AN908 is anionic polyacrylamide flocculant, and flocculation effect is better under alkaline condition, so the application adopts lime to provide an alkaline environment in advance, and the hydroxyl ion generated by lime decomposition can neutralize the positive charge on the surface of microfine particle, eliminate the repulsion between particles, promote the adsorption of flocculant AN908 and quickly form flocculation body.Further, a layer of protective film can be formed on the surface of the formed flocculation body by guar gum, to prevent the flocculation body from being dispersed again.The combined flocculants in the application have good synergistic effect, and realize the rapid settlement of microfine high talc copper cobalt ore (more than 70% of particles <15 μm).

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, specifically to a highly efficient combined flocculant for fine-grained high-talc copper-cobalt ore and its application method. Background Technology

[0002] Polyacrylamide is currently the most widely used organic polymer flocculant in the mining industry (Jiang Yaxiong, Huang Lijuan, Liu Gang, et al. Study on flocculation and sedimentation test of fine tailings and efficient use mode of flocculant [J]. Mining and Metallurgy, 2017, 26(1):42-46.). It mainly accelerates sedimentation by forming a bridging effect between different fine particles through the strong adsorption capacity of its long molecular chains dissolved in water, connecting multiple fine particles together to form large flocs. However, industrial production results show that the effect of a single flocculant is not obvious when treating some complex samples (Zhao Fei. Preparation and flocculation effect of high-efficiency composite flocculant [J]. Modern Salt Chemical Industry, 2022, 49(6):7-9.). During the operation of a copper-cobalt ore processing plant, it was found that when processing fine-particle (70% <15μm) high-talc copper-cobalt ore, the use of polyacrylamide (AN908) as a flocculant resulted in persistent problems that were difficult to control in industrial production, such as thickener runoff and clogging of the grinding water return pool. This significantly reduced the plant's processing capacity (from 5,000 tons of ore per day to approximately 2,000 tons per day). With the continued development of mineral resources, the characteristics of remaining resources—being scarce, fine-grained, and complex—will become more pronounced. Therefore, the development of a highly efficient combined flocculant for fine-particle high-talc ore is urgently needed.

[0003] Based on their composition, combined flocculants can be classified into inorganic-inorganic composite flocculants, organic-organic composite flocculants, and inorganic-organic composite flocculants (Yang Ke. Research and Application of Enhanced Coagulation-Inorganic-Organic Composite High-Efficiency Flocculants [D]. Liaoning University of Science and Technology, 2017.). Among them, inorganic-organic composite flocculants combine the performance advantages of inorganic and organic flocculants and are the main direction for the development of high-efficiency combined flocculants. Polyacrylamide has a long molecular chain and has the advantages of strong adsorption capacity and reusability after dissolving in water (Yang Chengmei. Preparation of Composite Flocculants and Optimization of Wastewater Treatment Process [J]. Chemical Engineer, 2021, 35(4):4.). However, due to its metal ions, which are harmful to water quality, and the fact that its high molecular structure is difficult to degrade, it is usually used as a coagulant aid in combination with other flocculants during the development of combined agents (JI C, WEI X, WANG H, et al. Akaolinite-based design of kaolin / TiO2-PAMcomposite flocculant and the application of the oil sand tailings flocculant[J]. Journal of Dispersion Science and Technology, 2021(4):569-580.).

[0004] Currently, some combined flocculants have been developed on the market, such as alum + polyacrylamide (Ebeling JM, Welsh CF, Rishel KL. Performance evaluation of an inc lined belt filter using coagulation / flocculation aids for the removal of suspended solids and phosphorus from micorscreen back-wash effluent[J]. Aquacultural Engineering, 2006, 35: 61-77.), aluminum salt + polyacrylamide, iron salt + polyacrylamide (Yang Ke. Research and application of enhanced coagulation-inorganic-organic composite high-efficiency flocculant[D]. Liaoning University of Science and Technology, 2017.), starch or polyethylene glycol (Chinese patent application CN102744162 A), lime or sodium hydroxide + polyacrylamide or polyethylene oxide (Chinese patent application CN110294546A), lime + polyacrylamide + polyaluminum chloride (Chinese patent application CN 119797653 A), lime + sodium oxalate + modified polyacrylamide (Chinese patent application CN 117861864). A) and guar gum + carboxymethyl cellulose + polyacrylamide (Chinese patent application CN 113137237 A), when treating fine-particle (70% <15μm) high-talc copper-cobalt ore, exhibit slow settling rates, leading to thickener runoff and significantly reducing the processing capacity of the plant. Therefore, a highly efficient combined flocculant for fine-particle (70% <15μm) high-talc copper-cobalt ore requires further optimization. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention aims to provide a highly efficient combined flocculant for fine-particle high-talc copper-cobalt ore and its application method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A highly efficient combined flocculant for fine-grained high-talc copper-cobalt ore comprises lime, AN908, and guar gum, wherein the mass ratio of lime, AN908, and guar gum is 180-220:30-100:15-35; wherein more than 70% of the particles in the fine-grained high-talc copper-cobalt ore have a particle size of <15μm.

[0008] This application also provides a method for applying the above-mentioned high-efficiency combined flocculant in the sedimentation of fine-grained high-talc copper-cobalt ore. The specific process is as follows: lime, AN908 and guar gum from the high-efficiency combined flocculant are added sequentially to the slurry of fine-grained high-talc copper-cobalt ore, and then sedimentation is carried out.

[0009] Furthermore, in the above method, the slurry has a mass concentration of 16-18% and an initial pH of 7-7.5.

[0010] Furthermore, in the above method, the amounts of lime, AN908, and guar gum added are 180-220 g / t dry weight of lime, 30-100 g / t dry weight of AN908, and 15-35 g / t dry weight of guar gum, respectively.

[0011] Furthermore, in the above method, the mixture is stirred for 0.5 minutes after adding lime, AN908, and guar gum.

[0012] The beneficial effects of this invention are as follows: The invention uses lime, AN908, and guar gum as a combined flocculant for fine-particle high-talc copper-cobalt ore. AN908 is an anionic polyacrylamide flocculant, which exhibits better flocculation under alkaline conditions. Therefore, this invention uses lime to pre-treat the slurry, providing an alkaline environment. Furthermore, the hydroxide ions generated by lime decomposition can neutralize the positive charge on the surface of the fine particles, eliminating interparticle repulsion and promoting the adsorption of flocculant AN908 to rapidly form flocs. Further, guar gum can form a protective film on the surface of the formed flocs, preventing redispersibility. The combined flocculant in this invention exhibits a good synergistic effect, achieving rapid sedimentation of fine-particle (over 70% particles <15μm) high-talc copper-cobalt ore. Attached Figure Description

[0013] Figure 1 This is a flowchart illustrating the implementation of the method in Embodiment 1 of the present invention.

[0014] Figure 2 This is a comparison chart of process parameters in Comparative Example 1 of the present invention;

[0015] Figure 3 This is a comparison chart of process parameters in Comparative Example 2 of the present invention. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0017] Example 1

[0018] This embodiment provides a method for applying a highly efficient combined flocculant of fine-particle high-talc copper-cobalt ore, such as... Figure 1 As shown, the specific process is as follows:

[0019] The high-talc copper-cobalt ore slurry containing more than 70% particles <15μm was filtered, dried, and mixed evenly for later use. Before the sedimentation experiment, 90g of the evenly mixed dry sample was placed in a 500mL graduated cylinder with 410mL of water and stirred for 0.5 minutes to obtain a slurry sample suitable for the sedimentation experiment. The solids concentration in this slurry sample was 18%, and the initial pH of the slurry was 7.

[0020] 200 g / t dry weight of lime, 50 g / t dry weight of AN908, and 25 g / t dry weight of guar gum were added sequentially to the slurry sample used for sedimentation experiments. The mixture was stirred for 0.5 minutes after each addition before the sedimentation experiment was conducted to obtain the sedimentation rate of fine-grained (over 70% of particles <15 μm) high-talc copper-cobalt ore. AN908 is a commonly used anionic polyacrylamide flocculant in industry.

[0021] In this embodiment, the total amount of the high-efficiency combined flocculant is 275 g / t of dry weight of raw ore, including: 200 g / t of lime, 50 g / t of AN908 and 25 g / t of guar gum.

[0022] Example 2

[0023] The method in this embodiment is basically the same as that in embodiment 1. The main difference is that the total amount of the high-efficiency combined flocculant is 250g / t of dry weight of raw ore, which includes 180g / t of dry weight of lime, 50g / t of dry weight of AN908 and 20g / t of dry weight of guar gum.

[0024] Example 3

[0025] The method in this embodiment is basically the same as that in embodiment 1. The main difference is that the total amount of the high-efficiency combined flocculant is 255g / t of dry weight of raw ore, which includes 200g / t of dry weight of lime, 40g / t of dry weight of AN908 and 15g / t of dry weight of guar gum.

[0026] Comparative Example 1

[0027] This comparative example aims to compare the methods used in two comparative experiments with those in Example 1. The two comparative experiments and the methods used in Example 1 are basically the same, except that in one comparative experiment, the conventional flocculant AN908 was used instead of the high-efficiency combined flocculant used in Example 1, with a total dosage of 100 g / t of dry ore (because AN908 is a conventional flocculant, the dosage is usually below 50 g / t of dry ore, and increasing it to 100 g / t of dry ore is sufficient to illustrate the problem, and further increasing the dosage of AN908 has no impact on the data indicators). The other comparative experiment did not add any flocculant.

[0028] The two comparative experiments and the method used in Example 1 employed the same fine-grained high-talc copper-cobalt ore, with a Cu grade of approximately 1.01% and a cobalt grade of approximately 0.16%. The ore characteristics were: ① 91% was fine-grained (-15μm); ② it had a high talc content, accounting for approximately 39% of the ore.

[0029] The process parameters of Example 1 and the two comparative experiments are as follows: Figure 2 As shown (the time required to reach settling equilibrium and the height of the clarification layer are used to reflect the effect of the highly effective combined flocculant in promoting flocculation and settling):

[0030] from Figure 2 As can be seen, Example 1 achieved better sedimentation performance. In the two comparative experiments, the time to reach sedimentation equilibrium was 43 mins in the experiment without any flocculant and 30 mins in the experiment with only AN908. However, the method in Example 1 further shortened the time to reach sedimentation equilibrium to about 10 mins and achieved the highest clarification level, proving that the highly efficient combined flocculant significantly accelerated the sedimentation rate of fine-particle high-talc copper-cobalt ore.

[0031] Comparative Example 2

[0032] This comparative example aims to compare the method with that of two other comparative experiments and Example 2. The two comparative experiments and the method of Example 2 are basically the same, except that in one comparative experiment, the conventional flocculant AN908 was used instead of the high-efficiency combined flocculant used in Example 2, with a total dosage of 100 g / t of dry ore (because AN908 is a conventional flocculant, the dosage is usually below 50 g / t of dry ore, and increasing it to 100 g / t of dry ore is sufficient to illustrate the problem, and further increasing the dosage of AN908 has no impact on the data indicators). The other comparative experiment did not add any flocculant.

[0033] The two comparative experiments and the method in Example 2 used the same fine-grained high-talc copper-cobalt ore, with a Cu grade of approximately 1.42% and a cobalt grade of approximately 0.10%. The ore characteristics are: ① Fine-grained (-15μm) ore accounts for 72%; ② Talc content is relatively high, accounting for approximately 33% of the ore. The process parameters of the two comparative experiments and the method in Example 2 are as follows: Figure 2 The figure shows the effect of the highly efficient combined flocculant in promoting flocculation and sedimentation, as reflected by the time required to reach sedimentation equilibrium and the height of the clarification layer.

[0034] from Figure 3As can be seen, Example 2 achieved better settling performance. In the comparative experiment with AN908, the time to reach settling equilibrium was 15 minutes, while in Example 2, the time was reduced to 8.5 minutes. The comparative experiment without the reagent did not reach settling equilibrium within the recorded time, demonstrating its difficulty in settling. More importantly, the final clarified layer height in Example 2 was also higher than that in the comparative experiment with only AN908, proving that the highly efficient combined flocculant significantly accelerated the settling rate of fine-particle high-talc copper-cobalt ore.

[0035] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this invention.

Claims

1. A method for the use of a high efficiency combination flocculant for fine grained high talcous carrollite ores, characterized in that, The high-efficiency combined flocculant comprises lime 180-220 parts by weight, AN908 30-100 parts by weight and guar gum 15-35 parts by weight; the fine-grained high-slip copper-cobalt ore has more than 70% of the particles with a particle size less than 15 microns; and the application method comprises the following steps: adding lime, AN908 and guar gum in the high-efficiency combined flocculant into the fine-grained high-slip copper-cobalt ore slurry in sequence, and then performing sedimentation.

2. The use according to claim 1, characterized in that, The mass concentration of the slurry is 16-18%, and the initial pH is 7-7.

5.

3. The use according to claim 1, characterized in that, The adding amount of lime, AN908 and guar gum is lime 180-220 g / t of dry weight of raw ore, AN908 30-100 g / t of dry weight of raw ore and guar gum 15-35 g / t of dry weight of raw ore, respectively.

4. The use according to claim 1, characterized in that, Stirring is performed for 0.5 minutes after adding lime, after adding AN908 and after adding guar gum.

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