阅读说明：本技术 一种利用氰胺黑渣造球制白灰的方法 (Method for preparing lime by utilizing cyanamide black slag for pelletizing ) 是由 赵黎明 姬越城 于 2019-10-15 设计创作，主要内容包括：本发明公开了一种利用氰胺黑渣造球制白灰的方法,该包括如下步骤：将氰胺黑渣通过板框过滤机使其水分低至30％以下,对氰胺黑渣反复密实操作后,进行均匀造球,制成氰胺黑渣球状制品；再将氰胺黑渣球状制品输送至高温煅烧炉中,高温煅烧,煅烧时间2～4小时；最后将白灰冷却后,进行防尘处理,即可得白灰。本发明一方面可以解决氰胺生产中产生的黑渣,保护了生态环境,做到了废物再利用,另一方面采用的工艺简单,制备的白灰成本低、质量好,具有良好的经济效益。(The invention discloses a method for manufacturing lime by utilizing cyanamide black slag pelletization, which comprises the following steps: making the water content of the cyanamide black slag to be below 30% by a plate-and-frame filter, and carrying out uniform pelletizing after repeatedly compacting the cyanamide black slag to prepare a spherical product of the cyanamide black slag; then conveying the cyanamide black slag spherical product into a high-temperature calcining furnace, and calcining at high temperature for 2-4 hours; and finally, cooling the lime, and then performing dustproof treatment to obtain the lime. The invention can solve the problem of black slag generated in the production of cyanamide, protect the ecological environment and recycle wastes, and has simple process, low cost and good quality of the prepared lime and good economic benefit.)

1. A method for manufacturing lime by utilizing cyanamide black slag pelletization is characterized by comprising the following steps:

(1) pouring the cyanamide black slag into a plate-and-frame filter press, reducing the water content of the cyanamide black slag to be below 30%, and continuously carrying out repeated compacting operation on the cyanamide black slag to obtain primarily treated cyanamide black slag;

(2) putting the primarily treated cyanamide black slag obtained in the step (1) into a pelletizer, and uniformly pelletizing to obtain a spherical product of cyanamide black slag;

(3) conveying the cyanamide black slag spherical product obtained in the step (2) to a high-temperature calcining furnace for high-temperature calcining for 2-4 hours to obtain lime at high temperature;

(4) and (4) cooling the lime obtained in the step (3) at high temperature, and then performing dustproof treatment to obtain the lime.

2. The method for pelletizing cyanamide black slag to produce lime according to claim 1, wherein the diameter of the spherical product of cyanamide black slag in the step (2) is 3-5 cm.

3. The method for pelletizing cyanamide black slag to produce lime according to claim 1, wherein the temperature of the high-temperature calcination in the step (3) is 800-1000 ℃.

4. The method for producing lime by pelletizing cyanamide black slag according to claim 1, wherein the compacting operation in step (1) is as follows: and repeatedly extruding the cyanamide black slag with the water content of 30% by using a compacting machine for many times.

5. The method for manufacturing lime by pelletizing cyanamide black slag according to claim 1, wherein the dust-proof treatment in the step (4) comprises the following specific operation processes: and (4) sealing the calcined lime by using a dustproof cover in the cooling process, and arranging an air vent.

Technical Field

The invention relates to the technical field of industrial waste residue recycling production, in particular to a method for manufacturing lime by utilizing cyanamide black slag for pelletizing.

Background

The cyanamide black slag is black slag generated in the cyanamide production industry, is difficult to purify and use due to complex components, and finally cannot be reasonably utilized, so that the cyanamide black slag is accumulated like a mountain, occupies a large amount of land, and meanwhile, contains certain toxic substances, and causes serious influence on the surrounding environment, such as pollution to drinking water, harm to crops and the like.

In the prior art, most of the cyanamide black slag is treated by adopting a hollowing and burying mode, and the cyanamide black slag cannot be effectively utilized, so that not only is serious environment and soil pollution caused, but also the ecological environment is damaged, and the transportation cost of waste slag is increased.

Therefore, how to provide an effective and reasonable method for treating the cyanamide black slag is a problem which needs to be solved by the technical personnel in the field.

Disclosure of Invention

In view of the above, the invention provides a method for producing lime by pelletizing cyanamide black slag, which can solve the problem of black slag generated in cyanamide production, protect ecological environment, recycle waste, and has the advantages of simple process, low cost of the prepared lime, good quality, and good economic, environmental and social benefits.

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

a method for manufacturing lime by utilizing cyanamide black slag pelletization comprises the following steps:

(1) pouring the cyanamide black slag into a plate-and-frame filter press, reducing the water content of the cyanamide black slag to be below 30%, and continuously carrying out repeated compacting operation on the cyanamide black slag to obtain primarily treated cyanamide black slag;

(2) putting the primarily treated cyanamide black slag obtained in the step (1) into a pelletizer, and uniformly pelletizing to obtain a spherical product of cyanamide black slag;

(3) and (3) conveying the cyanamide black slag spherical product obtained in the step (2) to a high-temperature calcining furnace, and calcining at high temperature, wherein the high-temperature calcining time is that after the lime at high temperature is cooled, dust is prevented, and the lime can be obtained.

Preferably, the diameter of the cyanamide black slag spherical product in the step (2) is 3-5 cm.

Preferably, the temperature of the high-temperature calcination in the step (3) is 800-1000 ℃.

Preferably, the compacting operation in step (1) specifically comprises the following steps: the melamine black slag with the water content of 30 percent is repeatedly extruded for a plurality of times by using a compacting machine, so that the pores in the black slag reach the lowest limit standard, the particle density reaches the highest, and the phenomena of cracking and the like of the manufactured ball are not easy to occur.

Preferably, the dust-proof treatment in the step (4) specifically comprises the following operation processes: the lime after the completion calcination uses the shield to seal in the cooling process, only need set up the blow vent can, avoid the entering of dust and other impurity, pollute the product.

Compared with the prior art, the invention discloses a method for manufacturing lime by utilizing cyanamide black slag to pelletize, and the method has the following beneficial effects:

(1) the ingredients in the cyanamide black slag are complex, besides part of inorganic substances, part of organic substances such as dicyandiamide, melamine, cyanamide and the like are contained, the extracted dicyandiamide is polymerized into more melamine and unknown impurities when being recovered, the recovered products cannot be used, and other methods for recycling except landfill are difficult to realize. The lime is prepared by pelletizing and calcining, so that economic value can be created, organic matters can be burnt into water, carbon dioxide, nitrogen oxides and the like in the high-temperature calcining process, and the obtained lime is relatively pure in components.

(2) The invention solves the problem of environmental pollution of the cyanamide black slag, utilizes the process of preparing the lime by tightly pelletizing the cyanamide black slag to produce the lime, not only recycles waste slag and protects the environment and water resources from being polluted, but also has the characteristics of low production cost, low energy consumption, good product quality and remarkable economic benefit.

(3) The invention provides a method for manufacturing lime by utilizing cyanamide black slag pelletization, which is characterized in that after the cyanamide black slag is dehydrated and subjected to compacting operation, uniform pelletization is carried out by a pelletizer, and then high-temperature calcination is carried out in a high-temperature calciner, so that high-quality lime is finally obtained.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a method for manufacturing lime by utilizing cyanamide black slag pelletization, which comprises the following steps:

(1) pouring the cyanamide black slag into a plate-and-frame filter press, reducing the water content of the cyanamide black slag to be below 30%, and continuously carrying out repeated compacting operation on the cyanamide black slag to obtain primarily treated cyanamide black slag;

(2) putting the primarily treated cyanamide black slag obtained in the step (1) into a pelletizer, and uniformly pelletizing to obtain a spherical product of cyanamide black slag;

(3) conveying the cyanamide black slag spherical product obtained in the step (2) to a high-temperature calcining furnace for high-temperature calcining for 2-4 hours to obtain lime at high temperature;

(4) and (4) cooling the lime obtained in the step (3) at high temperature, and then performing dustproof treatment to obtain the lime.