阅读说明：本技术 一种电石渣提纯和循环制备氧化钙的方法 (Method for preparing calcium oxide by purifying and recycling carbide slag ) 是由 宿新泰 张恒 刘峰 唐福文 于 2019-12-04 设计创作，主要内容包括：本发明公开一种电石渣提纯和循环制备氧化钙的方法,包括下述步骤：(1)将含水量为85-95%的电石渣浆通过悬液分离器分离,除去电石渣中的固体渣滓,制备成浆液,备用：(2)向步骤(1)制备的浆液中加入有机溶剂进行充分搅拌,然后加入络合剂充分搅拌,脱除浆液中残留的金属离子杂质,备用；(3)对步骤(2)中制备的浆液进行固液分离,得到提纯络合剂包覆的电石渣和有机溶剂,备用；(4)将步骤(3)中提纯的电石渣直接压制成球,通过螺旋加料器送入煅烧炉煅烧成氧化钙球。本方法采用简单工艺,可以降低传统电石渣处理工艺中杂质的含量；对石灰石矿石进行了保护,同时能减少电石渣对环境的危害,且能减小企业废物处理经济消耗。(The invention discloses a method for preparing calcium oxide by purifying and recycling carbide slag, which comprises the following steps: (1) separating the carbide slag slurry with the water content of 85-95% through a suspension separator, removing solid slag in the carbide slag, and preparing slurry for later use: (2) adding an organic solvent into the slurry prepared in the step (1) for fully stirring, then adding a complexing agent for fully stirring, and removing residual metal ion impurities in the slurry for later use; (3) carrying out solid-liquid separation on the slurry prepared in the step (2) to obtain carbide slag coated by the purified complexing agent and an organic solvent for later use; (4) and (4) directly pressing the carbide slag purified in the step (3) into balls, and feeding the balls into a calcining furnace through a spiral feeder to calcine the balls into calcium oxide balls. The method adopts a simple process, and can reduce the content of impurities in the traditional carbide slag treatment process; the limestone ore is protected, the harm of the carbide slag to the environment can be reduced, and the economic consumption of waste treatment of enterprises can be reduced.)

1. A method for preparing calcium oxide by purifying and recycling carbide slag is characterized by comprising the following steps:

(1) separating the carbide slag slurry with the water content of 85-95% through a suspension separator, removing solid slag in the carbide slag, and preparing slurry for later use:

(2) adding an organic solvent into the slurry prepared in the step (1) for fully stirring, then adding a complexing agent for fully stirring, and removing residual metal ion impurities in the slurry for later use;

(3) carrying out solid-liquid separation on the slurry prepared in the step (2) to obtain carbide slag coated by the purified complexing agent and an organic solvent for later use;

(4) and (4) directly pressing the carbide slag purified in the step (3) into balls, and feeding the balls into a calcining furnace through a spiral feeder to calcine the balls into calcium oxide balls.

2. The method for preparing calcium oxide by purifying and recycling carbide slag according to claim 1, wherein the method comprises the following steps: the organic solvent in the step (2) is n-hexane and/or acetone and/or petroleum ether organic solvent, and the stirring time is 2-7 hours.

3. The method for preparing calcium oxide by purifying and recycling carbide slag according to claim 1, wherein the method comprises the following steps: the complexing agent in the step (2) is oleylamine and/or oleic acid and/or sodium oleate complexing agent, and the complexing time is 0.5-8 hours.

4. The method for preparing calcium oxide by purifying and recycling carbide slag according to claim 1, wherein the method comprises the following steps: the calcination temperature in the step (4) is 1000-^oC, the time is 30-100 minutes.

Technical Field

The invention belongs to the field of resource utilization of industrial solid wastes, and particularly relates to a method for purifying and circularly preparing calcium oxide from carbide slag.

Background

In recent years, the rapid development of domestic PVC and PVA produced by a calcium carbide method also drives the accelerating development of the lime industry. However, due to the scattered distribution of limestone and the vigorous exploitation over several years, the limestone raw material required by the lime industry cannot meet the development of the industry. Meanwhile, due to the requirements of energy conservation and emission reduction, the consumption of waste carbide slag generated in the carbide industry is continuously reduced, so that the accumulated stockpiling is gradually increased. Most enterprises stack or bury the carbide slag on site, which not only occupies land resources, but also pollutes groundwater and harms ecosystem due to the strong alkaline property of the carbide slag. Based on the above two points, how to recycle the waste carbide slag becomes a global popular research direction.

The calcium oxide is a raw material for producing calcium carbide, and the process for directly preparing the calcium oxide from the carbide slag has been developed to a certain extent at present, but the key problem of high content of impurities in the carbide slag is ignored in the traditional process. If the carbide slag is not reasonably pre-purified and used as a raw material for producing calcium carbide, the quality of the calcium carbide product is seriously reduced. Therefore, a method for preparing calcium oxide by simply treating and efficiently purifying the carbide slag is required.

Disclosure of Invention

The purpose of the invention is: provides a method for preparing calcium oxide by purifying and recycling industrial waste carbide slag, solves the key problem of high content of impurities in the carbide slag in the traditional process, and can recycle resources.

The technical scheme of the invention is as follows: a method for preparing calcium oxide by purifying and recycling carbide slag comprises the following steps:

(1) separating the carbide slag slurry with the water content of 85-95% through a suspension separator, removing solid slag in the carbide slag, and preparing slurry for later use:

(2) adding an organic solvent into the slurry prepared in the step (1) for fully stirring, then adding a complexing agent for fully stirring, and removing residual metal ion impurities in the slurry for later use;

(3) carrying out solid-liquid separation on the slurry prepared in the step (2) to obtain carbide slag coated by the purified complexing agent and an organic solvent for later use;

(4) and (4) directly pressing the carbide slag purified in the step (3) into balls, and feeding the balls into a calcining furnace through a spiral feeder to calcine the balls into calcium oxide balls.

Optimally designing, wherein the organic solvent in the step (2) is n-hexane and/or acetone and/or petroleum ether organic solvent, and stirring for 2-7 hours.

Optimally designing, wherein the complexing agent in the step (2) is oleylamine and/or oleic acid and/or sodium oleate complexing agent, and the complexing time is 0.5-8 hours.

The optimized design, the calcination temperature in the step (4) is 1000-^oC, the time is 30-100 minutes.

Has the advantages that: the invention provides a method for purifying and circularly preparing calcium oxide from carbide slag, which adopts a simple process and can reduce the content of impurities in the traditional carbide slag treatment process; the limestone ore is protected, the harm of the carbide slag to the environment can be reduced, and the economic consumption of waste treatment of enterprises can be reduced.

Drawings

FIG. 1 is a process flow chart of the calcium oxide preparation by carbide slag purification and circulation.

Detailed Description