阅读说明：本技术 一种利用含油废杂铜制备高纯铜锭的方法 (Method for preparing high-purity copper ingot by using oil-containing scrap copper ) 是由 李会泉 沈涛 李少鹏 李占兵 王兴瑞 朱干宇 陈军 于 2018-08-01 设计创作，主要内容包括：本发明涉及一种利用含油废杂铜制备高纯铜锭的方法,该方法是：首先将含油废杂铜进行低压热解脱油,然后将脱油后的废杂铜进行球磨处理再经筛分制得纯净废杂铜；再将纯净废杂铜进行熔融处理,将铜水注入固定的模具中,经冷却制备高纯铜锭。低压热解脱油过程产生的废烟气经吸附回收,熔融过程产生的烟气经冷却后,直接由低压热解脱油废气吸附系统吸附回收。本方法实现了废杂铜资源中铜资源的高效回收利用,低压热解和熔融过程产生的烟气经吸附实现了高度净化。本方法属环境友好型废杂铜清洁利用,具有广阔的市场前景。(The invention relates to a method for preparing a high-purity copper ingot by utilizing oil-containing scrap copper, which comprises the following steps: firstly, carrying out low-pressure pyrolysis deoiling on oil-containing scrap copper, then carrying out ball milling treatment on the deoiled scrap copper, and screening to obtain pure scrap copper; and melting the pure scrap copper, injecting copper water into a fixed die, and cooling to prepare the high-purity copper ingot. The waste flue gas generated in the low-pressure pyrolysis deoiling process is absorbed and recovered, and the flue gas generated in the melting process is directly absorbed and recovered by a low-pressure pyrolysis deoiling waste gas absorption system after being cooled. The method realizes the high-efficiency recycling of the copper resource in the scrap copper resource, and realizes the high purification of the flue gas generated in the processes of low-pressure pyrolysis and melting through adsorption. The method belongs to environment-friendly clean utilization of scrap copper and has wide market prospect.)

1. A method for preparing high-purity copper ingots by using oil-containing scrap copper is characterized by comprising the following steps:

(1) carrying out low-pressure pyrolysis treatment on the oily scrap copper in a pyrolysis furnace, and directly introducing the waste gas into an adsorption tower for tail gas treatment;

(2) ball-milling the oily scrap copper treated in the step (1) in a ball mill, and then screening to remove breakable impurities in the scrap copper;

(3) melting the scrap copper with low impurities treated in the step (2) in a power frequency furnace, injecting copper water into a specific mould, and cooling to prepare a high-purity copper ingot;

(4) continuously slagging off in the melting process in the step (3), and collecting high-melting-point slag to realize further purification of scrap copper;

(5) collecting the flue gas generated by melting in the step (3), cooling and recovering the low-melting-point rare metal, and adsorbing and purifying the flue gas by an adsorption tower.

2. The method for preparing the high-purity copper ingot by using the oil-containing scrap copper according to claim 1, wherein the oil-containing scrap copper is pyrolyzed at low pressure under the conditions of 0.05-0.1 MPa of pressure, 1-3 h of pyrolysis time, 50-300 ℃ of pyrolysis temperature and reducing atmosphere.

3. The method for preparing the high-purity copper ingot by using the oil-containing scrap copper according to claim 1, wherein the adsorption tower in the steps (1) and (5) uses activated carbon or other adsorbents with larger analog surface areas as adsorbing materials.

4. The method for preparing the high-purity copper ingot by using the oil-containing scrap copper according to claim 1, wherein the ball milling treatment condition in the step (2) is that the ball milling time is 10-60 min.

5. The method for preparing the high-purity copper ingot by using the oil-containing scrap copper according to claim 1, wherein the melting process in the step (3) is performed at a temperature of 800-1000 ℃.

Technical Field

The invention relates to the field of metal resource recycling and solid waste resource recycling, in particular to a method for recycling oil-containing scrap copper in copper resource recycling, and particularly relates to a method for preparing high-purity copper ingots by using the oil-containing scrap copper.

Background

Copper-based oily waste residues are solid wastes generated in the copper material processing process, particularly copper scraps generated in the copper cutting process, wherein the copper scraps contain a large amount of copper resources and are doped with impurities such as cutting oil, sand and stone. While the application of the metal copper in the industries of electric power, machinery, electronics, electrical appliances, weapons and the like is very wide, but China is always a country with shortage of copper resources, copper mine resources are poor, the exploitation difficulty is high, newly discovered resources are few, and the reserve reserves are insufficient. Copper regeneration is an important way for making up for the shortage of copper resources in China. Therefore, the method for recovering copper from copper-based oil-containing waste residues completely conforms to the national development strategy and has important practical significance.

At present, the research on recovering copper from copper-based oily waste residues is less, and most of the research is to extract copper from copper ores by flotation or recover copper from waste enameled wires. The direct discharge of copper-based oily waste residues can cause serious environmental pollution and also can cause serious loss of copper resources.

The invention provides a method for preparing a high-purity copper ingot by using oily scrap copper, aiming at solving the problems of recycling of copper-based oily waste residues and environmental pollution. And recovering copper by adopting low-temperature pyrolysis, ball milling and high-temperature melting to prepare the high-purity copper ingot.

Disclosure of Invention

The invention aims to provide a method for preparing a high-purity copper ingot by utilizing oil-containing scrap copper, which realizes copper resource regeneration and preparation of the high-purity copper ingot. The method solves the pollution problem of copper-based oily waste residues, realizes copper resource recovery, effectively treats flue gas in the treatment process, belongs to a clean production process, and does not produce secondary pollution.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for preparing high-purity copper ingots by utilizing oil-containing scrap copper comprises the following steps:

(1) carrying out low-pressure pyrolysis treatment on the oily scrap copper in a pyrolysis furnace, and directly introducing the waste gas into an adsorption tower for tail gas treatment;

(2) ball-milling the oily scrap copper treated in the step (1) in a ball mill, and then screening to remove breakable impurities in the scrap copper;

(3) melting the scrap copper with low impurities treated in the step (2) in a power frequency furnace, injecting copper water into a specific mould, and cooling to prepare a high-purity copper ingot;

(4) continuously slagging off in the melting process in the step (3), and collecting high-melting-point slag to realize further purification of scrap copper;

(5) collecting the flue gas generated by melting in the step (3), cooling and recovering the low-melting-point rare metal, and adsorbing and purifying the flue gas by an adsorption tower.

According to the invention, the low-pressure pyrolysis is carried out on the oily scrap copper in the early stage, and 90% of oil in the oily scrap copper is removed, so that the treated scrap copper can be directly melted in a power frequency furnace, and the oil-free scrap copper does not need to be mixed and melted, thereby avoiding disasters caused by fire in the melting process; the ball milling and screening can further remove the brittle impurities such as sand and stone in the oily scrap copper and improve the purity of the oily scrap copper; the flue gas is directly/cooled after low-pressure pyrolysis and scrap copper melting and then is introduced into the absorption tower to realize the purification of the flue gas, thereby avoiding the environmental pollution.

Preferably, the low-pressure pyrolysis conditions in step (1) are a pressure of 0.05 to 0.1MPa, such as 0.05MPa, 0.06MPa, 0.07MPa, 0.08MPa, 0.09MPa or 0.1 MPa; the pyrolysis time is 1-3 h, such as 1h, 1.2h, 1.5h, 1.8h, 2h, 2.5h, 2.8h or 3h, and the pyrolysis temperature is 50-300 ℃, such as 50 ℃, 80 ℃, 100 ℃, 120 ℃, 150 ℃, 200 ℃, 220 ℃, 250 ℃ or 300 ℃; the pyrolysis atmosphere is a reducing atmosphere.

Preferably, the adsorption tower in the step (1) and the adsorption tower in the step (5) use activated carbon or other adsorbents with larger analog surface area.

Preferably, the ball milling treatment condition in the step (2) is 10-60 min, such as 10min, 20min, 30min, 40min, 50min or 60 min.

Preferably, the temperature of the melting process in the step (3) is 800-1000 ℃, such as 800 ℃, 850 ℃, 900 ℃ or 1000 ℃.

Compared with the prior art, the invention has at least the following beneficial effects:

the invention realizes the high-efficiency recycling of copper resources in scrap copper resources, and ensures that the copper content in the prepared high-purity copper ingot reaches more than 96 percent; meanwhile, flue gas generated in the low-pressure pyrolysis and melting processes is adsorbed to realize high purification, so that the method belongs to an environment-friendly clean scrap copper utilization method.

Drawings

FIG. 1 is a process flow chart for preparing high-purity copper ingots by using oil-containing scrap copper.

The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

FIG. 1 shows a flow chart of the process for preparing high-purity copper ingots by using scrap copper containing oil according to the present invention, and the following examples are all operated according to the flow chart.