阅读说明：本技术 一种熔炼用木炭的煅烧方法 (Calcination method of charcoal for smelting ) 是由 潘建立 赵兵 刘伟锋 李永华 王少军 王健健 李文亮 于 2020-04-26 设计创作，主要内容包括：本发明公开了一种熔炼用木炭的煅烧方法,该煅烧方法包括如下步骤：步骤一、将待煅烧的木炭封装到带有排气通道的不锈钢煅烧封装结构；步骤二、将所述不锈钢煅烧封装结构的排气通道打开后放进加热炉内；步骤三、打开抽风系统,并将所述加热炉加热升温至400～500℃后烘烤4.5～5.5小时后断电降温出炉。本发明既可以避免木炭的氧化烧损,又能够充分去除木炭内的水分。(The invention discloses a calcination method of charcoal for smelting, which comprises the following steps: step one, packaging charcoal to be calcined to a stainless steel calcining and packaging structure with an exhaust channel; step two, opening an exhaust passage of the stainless steel calcining and packaging structure and then placing the stainless steel calcining and packaging structure into a heating furnace; and step three, opening an air draft system, heating the heating furnace to 400-500 ℃, baking for 4.5-5.5 hours, and then cutting off the power, cooling and discharging. The invention can not only avoid the oxidation burning loss of the charcoal, but also can fully remove the moisture in the charcoal.)

1. A calcination method of charcoal for smelting, which is characterized by comprising the following steps:

step one, packaging charcoal to be calcined to a stainless steel calcining and packaging structure with an exhaust channel;

step two, opening an exhaust passage of the stainless steel calcining and packaging structure and then placing the stainless steel calcining and packaging structure into a heating furnace;

and step three, opening an air draft system, heating the heating furnace to 400-500 ℃, baking for 4.5-5.5 hours, and then cutting off the power, cooling and discharging.

2. The calcination process of claim 1, further comprising:

and step four, sealing the exhaust channel on the stainless steel calcining and packaging structure after the stainless steel calcining and packaging structure is discharged out of the furnace by adopting aluminum silicate fiber cotton for standby.

3. The calcination method as claimed in claim 1 or 2, wherein in the third step, the rotation speed of the air draft system is 1440 to 2000 r/min.

4. The calcination method as claimed in claim 1 or 2, wherein in the third step, the temperature of the furnace is 200 ℃ or lower when the temperature of the furnace is reduced by cutting off the power supply.

5. The calcining method of claim 1 or 2, wherein in the first step, the stainless steel calcining encapsulation structure comprises a shell and a cover cap which is connected with the shell in a sealing way;

a plurality of exhaust channels are arranged on the cover cap; each vent passage extending out of the cap; gas generated by the charcoal in the shell in the smelting process flows out through the exhaust passage.

6. The calcining method of claim 5, wherein the stainless steel calcining encapsulation structure further comprises a lifting lug disposed on the shell.

7. Calcination method according to claim 5 or 6, wherein each exhaust channel extends 50 to 200mm outside the cap.

8. The calcination method according to claim 5 or 6, wherein each of the exhaust passages has a diameter of 10 to 30 mm.

9. Calcination process according to claim 5 or 6, wherein the shell is cylindrical, rectangular or cubic.

10. The calcination method as claimed in claim 5 or 6, wherein the inner joint gap portions of the shell and the cap are sealed with alumina silicate fiber cotton.

Technical Field

The invention belongs to the technical field of alloy casting, and relates to a method for calcining charcoal for smelting.

Background

Along with the development of economy, the requirements of copper and copper alloy products are more and more increased, the requirements on the quality of the products are higher and higher, the casting link is used as a first procedure in the production and processing process, and the quality of copper and copper alloy cast ingots plays a crucial role. In the process of casting copper and copper alloy, charcoal is required to cover the surface of the metal melt, and the charcoal mainly has three functions: 1) preserving heat; 2) air is isolated, and air suction is prevented; 3) reducing the metal oxide.

Charcoal has water absorption, is easy to absorb moisture during the manufacturing, transportation and storage processes, and particularly absorbs moisture more seriously under the conditions of rainy season and indoor humidity. The undried charcoal covers the surface of the metal melt, which causes the defects of air holes and looseness of copper and copper alloy cast ingots, and finally leads to product scrap.

Disclosure of Invention

The invention aims to provide a method for calcining charcoal for smelting, which can avoid oxidation burning loss of the charcoal and can fully remove moisture in the charcoal.

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

a calcination method of charcoal for smelting, comprising the steps of:

step one, packaging charcoal to be calcined to a stainless steel calcining and packaging structure with an exhaust channel;

step two, opening an exhaust passage of the stainless steel calcining and packaging structure and then placing the stainless steel calcining and packaging structure into a heating furnace;

and step three, opening an air draft system, heating the heating furnace to 400-500 ℃, baking for 4.5-5.5 hours, and then cutting off the power, cooling and discharging.

According to the invention, the charcoal is heated to a red state through the stainless steel calcining and packaging structure, moisture adsorbed in the charcoal can be changed into vapor at a high temperature of 400-500 ℃ and then diffused in the stainless steel calcining and packaging structure, the vapor is exhausted out of the stainless steel calcining and packaging structure through the exhaust channel, and the vapor is pumped out of the heating furnace (such as a trolley furnace or a shaft furnace) through the exhaust system, so that the moisture in the charcoal is completely removed, the charcoal is prevented from being oxidized and burned in the calcining process, the moisture in the charcoal can be thoroughly exhausted through the exhaust channel, and meanwhile, the calcined charcoal can be prevented from absorbing moisture for the second time and is easy to store; meanwhile, the control of the calcining temperature and the calcining time reduces the content of impurity elements such as S, Fe and the like in the metal melt, so that the calcined charcoal can well play a role in heat preservation, melt protection, gas purification and removal effects on the metal liquid when the copper alloy is smelted, the quality of the metal liquid is improved, the formation of the structure of the metal liquid in a solidification crystallizer is facilitated, and the guarantee of the internal quality of the cast ingot is facilitated.

Further, the calcination method further comprises:

and step four, sealing an exhaust passage on the calcined packaging structure after the charcoal is taken out of the furnace by adopting aluminum silicate fiber cotton for standby application, so as to prevent the calcined charcoal from generating secondary moisture absorption.

Further, in the third step, the rotating speed of the air draft system is 1440-2000 r/min.

Further, in the third step, the temperature of the furnace after power-off cooling and discharging is less than or equal to 200 ℃.

Further, in the first step, the calcining packaging structure comprises a shell and a cap hermetically connected with the shell;

a plurality of exhaust channels are arranged on the cover cap; each vent passage extending out of the cap; gas generated by the charcoal in the shell in the smelting process flows out through the exhaust passage.

Furthermore, the calcining packaging structure also comprises a lifting lug arranged on the shell, so that the charcoal packaging structure can be conveniently lifted.

Furthermore, each exhaust channel extends to 50-200 mm outside the cap, and the height of each exhaust channel is too low, so that the effect of completely pumping out water vapor is not achieved; the height of the exhaust passage is too high, occupying the space of the heating furnace or the calcining furnace, and not facilitating the thorough removal of the moisture remaining in the charcoal.

Furthermore, the diameter of each exhaust channel is 10-30 mm, and when the diameter of each exhaust channel is too small, water vapor cannot be completely discharged, so that charcoal cannot be thoroughly dried; too large a diameter of the exhaust passage may cause oxidation and burning of charcoal.

Further, the shell is a cylinder, a cuboid or a cube.

Furthermore, the inside joint gap position of casing and block adopts aluminium silicate fiber cotton sealed, and aluminium silicate fiber cotton has high temperature resistant, and has certain elasticity, puts in the butt joint department of metal and metal, strengthens the back through the bolt, can strengthen the leakproofness of charcoal calcining device, avoids in the air admission charcoal calcining device all around, causes the charcoal burning.

The invention has the beneficial effects that:

according to the invention, through the control of the stainless steel calcination packaging structure and the calcination process conditions, not only can the oxidation burning loss of the charcoal be avoided, but also the moisture in the charcoal can be completely removed, so that the phenomenon of air suction in copper and copper alloy melts is reduced; the stainless steel calcining and packaging structure is simple, the calcining operation is convenient, and the cost is low.

Detailed Description

The following detailed description of specific embodiments of the invention is provided.