Pretreatment agent for flotation of copper oxide ore with high binding rate and application method of pretreatment agent

Abstract

The invention relates to a pretreatment agent for flotation of copper oxide ore with high binding rate, which is a combined agent and comprises 1-2kg of 1-butyl-3-methylimidazolium hydrogen sulfate, 6-10kg of sodium sulfide and 3-4kg of sodium hydroxide according to the treatment of 1t of raw ore. Meanwhile, the invention further discloses an application method of the pretreatment agent. The pretreatment agent is used for pretreatment of copper oxide minerals with the binding rate larger than 50% before flotation, and after the pretreatment agent is adopted, the flotation effect is good, the process is stable, and operability is high.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, and in particular to a pretreatment agent for flotation of copper oxide ore with a high binding rate and an application method thereof. Background Art

[0002] The main recovery methods for oxidized copper ore are flotation and wet leaching. Compared with wet leaching, flotation has the characteristics of good economic benefits and environmental friendliness. However, flotation has almost no effect on oxidized copper ore with high binding rate, and wet leaching processes such as acid leaching are required for recovery. However, as the country pays more and more attention to environmental protection, the use of acid leaching process is restricted, especially for small and medium-sized mines or resources with small reserves, which are almost prohibited. Over the years, scholars have proposed ammonia leaching sulfide precipitation flotation and separation flotation for this type of difficult-to-select ore. The essence of these two flotation methods is to pre-treat the ore before flotation. The separation method is to pre-treat the ore with fire, and the infrastructure cost and operation cost are both high. It may be economically valuable only when the copper grade of the original ore is higher than 2%; the ammonia leaching sulfide precipitation method is only effective for alkaline gangue.

[0003] A copper sulfide mine in Xinjiang is an open-pit mine. The surface ore body has been exposed for a long time and has been oxidized. Over the years, the copper oxide ore piles stripped out exist in the mining area, with a copper grade of about 0.8% and 60% combined copper. If the conventional flotation process is used to recover the copper oxide, the recovery rate is only about 30%, and the utilization value is low; if it is stored for a long time, it will not only cause a waste of resources, but also occupy the Gobi Desert grassland, causing major environmental problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pretreatment agent for flotation of copper oxide ore with good flotation effect and high binding rate.

[0005] Another technical problem to be solved by the present invention is to provide an application method of the pretreatment agent for flotation of copper oxide ore with high binding rate.

[0006] In order to solve the above problems, the present invention discloses a pretreatment agent for flotation of copper oxide ore with high binding rate, characterized in that the pretreatment agent is a combined agent, which is composed of 1-butyl-3-methylimidazole hydrogen sulfate 1-2 kg, sodium sulfide 6-10 kg, and sodium hydroxide 3-4 kg based on the treatment of 1 t of raw ore.

[0007] The pretreatment agent is used for the pretreatment of copper oxide minerals with a binding rate greater than 50% before flotation.

[0008] The application method of the pretreatment agent for flotation of copper oxide ore with high binding rate as described above is characterized in that: after the copper oxide ore is crushed and ground, 1-butyl-3-methylimidazole hydrogen sulfate is added to the ground product and stirred for 30 minutes. Within 30 minutes, additional additions are made in time to maintain the pH value of the slurry not lower than 2, followed by adding sodium sulfide and stirring for 5 minutes, and finally adding sodium hydroxide and stirring for 5 minutes to obtain a flotation feed slurry with a pH value not lower than 6.

[0009] Compared with the prior art, the present invention has the following advantages: 1. The 1-butyl-3-methylimidazolium hydrogen sulfate added in the present invention is a new type of organic ionic liquid agent. After being dissolved in water, it ionizes into imidazolium cations and hydrogen sulfate anions. The hydrogen sulfate has a strong acidity, similar to sulfuric acid, but because of the presence of imidazolium cations, it has a stronger dissolving power than sulfuric acid. Both free copper oxide and bound copper oxide can be effectively dissolved into Cu 2+ .

[0010] 2. Compared with sulfuric acid as a pretreatment agent, the 1-butyl-3-methylimidazole hydrogen sulfate in the present invention is more environmentally friendly, has a small dosage, and has a high operating safety factor.

[0011] 3. After using the pretreatment agent of the present invention, copper oxide is pretreated with 1-butyl-3-methylimidazole hydrogen sulfate and sodium sulfide to generate artificial copper sulfide, and then sodium hydroxide is used to neutralize excess acid, and the pH of the slurry is adjusted to provide conditions for subsequent mineral flotation. The artificial copper sulfide has stable properties. Compared with direct flotation without pretreatment, it not only has a good flotation effect, but also has a stable process and strong operability. DETAILED DESCRIPTION

[0012] A pretreatment agent for flotation of high-binding rate copper oxide ore, which is a combined agent, consisting of 1-2 kg of 1-butyl-3-methylimidazole hydrogen sulfate, 6-10 kg of sodium sulfide, and 3-4 kg of sodium hydroxide, based on the treatment of 1 ton of raw ore. The pretreatment agent is used for pretreatment of copper oxide ore with a binding rate greater than 50% before flotation.

[0013] The invention discloses an application method of a pretreatment agent for flotation of copper oxide ore with high binding rate: after crushing and grinding the copper oxide ore, 1-butyl-3-methylimidazole hydrogen sulfate is added to the grinding product, and the mixture is stirred for 30 minutes. Within 30 minutes, sodium sulfide is added in time to maintain the pH value of the ore pulp not lower than 2, and then sodium sulfide is added and stirred for 5 minutes. Finally, sodium hydroxide is added and stirred for 5 minutes to obtain a flotation feed ore pulp with a pH value not lower than 6.

[0014] The pretreated flotation feed slurry is floated according to the following method: the pretreated feed slurry is slurried to a concentration of 30%-35%, 1000-2000g of lime is added, and after stirring for 3-5min, 100-150g of butyl xanthate and 30-50g of butyl ammonium black powder are added, and stirring is performed for 3min. After a roughing operation, a copper concentrate and a roughing tailing are obtained. After a concentration operation, a copper concentrate and a concentrated middling are obtained from the copper concentrate. 10-30g of butyl xanthate and 5-10g of butyl ammonium black powder are added to the roughing tailings. After a scavenging operation, scavenged middlings and tailings are obtained. The concentrated middlings and scavenged middlings are returned to the roughing operation.

[0015] Example 1 Test ore sample: It is oxidized copper ore with a copper grade of 1.3%, a copper oxidation rate of 76%, and combined oxidized copper accounting for 65%. Using conventional sulfide flotation process, the copper recovery rate is only 35%.

[0016] The copper oxide is recovered by the following steps: (1) Pretreatment: After the raw ore is crushed and ground, add 1200g / t of 1-butyl-3-methylimidazole hydrogen sulfate to the grinding product and stir for 30 minutes. Add more at the right time within 30 minutes to maintain the pH value of the slurry not lower than 2. Then add 6000g / t of sodium sulfide and stir for 5 minutes. Finally, add 3000g of sodium hydroxide and stir for 5 minutes to obtain the flotation feed slurry with a pH value of not lower than 6.

[0017] (2) Flotation: The pretreated feed slurry is adjusted to a concentration of 33%, and 1500 g / t of lime is added. After stirring for 3 minutes, 100 g / t of butyl xanthate and 30 g / t of butyl ammonium black powder are added. After stirring for 3 minutes, a copper concentrate and a rougher tailings are obtained after a roughing process. The copper concentrate is then subjected to a first concentration process to obtain a copper concentrate and a concentrated middling. 10 g / t of butyl xanthate and 5 g / t of butyl ammonium black powder are added to the rougher tailings. After a scavenging process, scavenged middlings and tailings are obtained. The concentrated middlings and scavenged middlings are returned to the roughing process.

[0018] The copper concentrate grade obtained by the above process is 22.3%, and the copper recovery rate is 63%.

[0019] Example 2 Test ore sample: It is oxidized copper ore with a copper grade of 2.5%, a copper oxidation rate of 58%, 60% of combined oxidized copper, and a high slime content. Using conventional sulfide flotation process, the copper recovery rate is only 40%, and a desliming process is required before flotation.

[0020] The copper oxide is recovered by the following steps: (1) Pretreatment: After the raw ore is crushed and ground, 1800 g / t of 1-butyl-3-methylimidazole hydrogen sulfate is added to the grinding product and stirred for 30 minutes. Within 30 minutes, additional water is added to maintain the pH value of the slurry not less than 2. Then, 8000 g / t of sodium sulfide is added and stirred for 5 minutes. Finally, 4000 g of sodium hydroxide is added and stirred for 5 minutes to obtain a flotation feed slurry with a pH value of not less than 6.

[0021] (2) Flotation: The pretreated feed slurry is adjusted to a concentration of 30%, and 1000 g / t of lime is added. After stirring for 3 minutes, 120 g / t of butyl xanthate and 40 g / t of butyl ammonium flotation are added. After stirring for 3 minutes, a copper concentrate and a rougher tailings are obtained after a roughing process. The copper concentrate is then subjected to a fine concentration process to obtain a copper concentrate and a fine middling. 10 g / t of butyl xanthate and 5 g / t of butyl ammonium flotation are added to the rougher tailings. After a scavenging process, scavenged middlings and tailings are obtained. The fine middlings and scavenged middlings are returned to the roughing process.

[0022] The copper concentrate grade obtained by the above process is 18.7%, and the copper recovery rate is 68%.

[0023] Example 3 Test ore sample: It is oxidized copper ore with a copper grade of 2.8%, a copper oxidation rate of 80%, and 80% combined oxidized copper. Using conventional sulfide flotation process, the copper recovery rate is only 30%.

[0024] The copper oxide is recovered by the following steps: (1) Pretreatment: After the raw ore is crushed and ground, add 2000g / t of 1-butyl-3-methylimidazole hydrogen sulfate to the grinding product and stir for 30 minutes. Add more at the right time within 30 minutes to maintain the pH value of the slurry not lower than 2. Then add 10000g / t of sodium sulfide and stir for 5 minutes. Finally, add 4000g of sodium hydroxide and stir for 5 minutes to obtain the flotation feed slurry with a pH value of not lower than 6.

[0025] (2) Flotation: The pretreated feed slurry is adjusted to a concentration of 30%, and 2000 g / t of lime is added. After stirring for 3 minutes, 150 g / t of butyl xanthate and 50 g / t of butyl ammonium flotation are added. After stirring for 3 minutes, a copper concentrate and a rougher tailings are obtained after a roughing process. The copper concentrate is then subjected to a first concentration process to obtain a copper concentrate and a concentrated middling. 20 g / t of butyl xanthate and 10 g / t of butyl ammonium flotation are added to the rougher tailings. After a first scavenging process, scavenged middlings and tailings are obtained. The concentrated middlings and scavenged middlings are returned to the roughing process.

[0026] The copper concentrate grade obtained by the above process is 30.5%, and the copper recovery rate is 55%.

Claims

1. A pretreatment agent for flotation of copper oxide ore with high binding rate, characterized in that: The pretreatment agent is a combination agent, which is composed of 1-butyl-3-methylimidazole hydrogen sulfate 1-2kg, sodium sulfide 6-10kg, and sodium hydroxide 3-4kg based on the treatment of 1t of raw ore.

2. A pretreatment agent for flotation of copper oxide ore with high binding rate as claimed in claim 1, characterized in that: The pretreatment agent is used for the pretreatment of copper oxide minerals with a binding rate greater than 50% before flotation.

3. The method for applying a pretreatment agent for flotation of copper oxide ore with high binding rate as claimed in claim 1 or 2, characterized in that: After the copper oxide ore is crushed and ground, 1-butyl-3-methylimidazole hydrogen sulfate is added to the grinding product and stirred for 30 minutes. During 30 minutes, additional additions are made to maintain the pH value of the slurry not lower than 2. Then, sodium sulfide is added and stirred for 5 minutes. Finally, sodium hydroxide is added and stirred for 5 minutes to obtain a flotation feed slurry with a pH value of not lower than 6.