阅读说明：本技术 一种金属制品表面废硫酸处理工艺 (Metal product surface waste sulfuric acid treatment process ) 是由 施荣标 于 2020-10-12 设计创作，主要内容包括：本发明公开了一种金属制品表面废硫酸处理工艺,将废硫酸放置到加热器中,随后将温度升高至60-65℃,持续1-1.5h,将温度升高到85-90℃,持续40-50min,再将温度升高到135-140℃,直至废硫酸中硫酸的分子质量为60%,将硫酸的分子质量为60%的废硫酸输送到搅拌机内,搅拌机内负压0.25MPa,将温度设置为120-130℃,转速设置为150-200r/min,持续5-10min,接着将搅拌后硫酸的分子质量为60%的废硫酸引入到蒸发器内,将温度直接上升至150-160℃,持续15-20min,随后将温度升降至200-210℃,直至废硫酸中硫酸的分子质量为95%,经过过滤,将浓硫酸收集,完成废硫酸的处理,该发明制备工艺简单,得到的浓硫酸,纯度高,无杂质,实现浓硫酸的再利用。(The invention discloses a treatment process of waste sulfuric acid on the surface of a metal product, which comprises the steps of placing the waste sulfuric acid in a heater, raising the temperature to 60-65 ℃ for 1-1.5h, raising the temperature to 85-90 ℃ for 40-50min, raising the temperature to 135-140 ℃ until the molecular mass of sulfuric acid in the waste sulfuric acid is 60%, conveying the waste sulfuric acid with the molecular mass of 60% into a stirrer, setting the temperature to 120-130 ℃ under the negative pressure of 0.25MPa in the stirrer, setting the rotating speed to 150-200r/min, continuing for 5-10min, introducing the waste sulfuric acid with the molecular mass of 60% of the stirred sulfuric acid into an evaporator, directly raising the temperature to 150-160 ℃ for 15-20min, then raising the temperature to 200-210 ℃ until the molecular mass of sulfuric acid in the waste sulfuric acid is 95%, the method has the advantages that the preparation process is simple, the obtained concentrated sulfuric acid has high purity and no impurities, and the concentrated sulfuric acid is recycled.)

1. A treatment process of waste sulfuric acid on the surface of a metal product is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: placing the waste sulfuric acid into a heater, then raising the temperature to 60-65 ℃, continuing for 1-1.5h, raising the temperature to 85-90 ℃, continuing for 40-50min, then raising the temperature to 135-140 ℃ until the molecular mass of sulfuric acid in the waste sulfuric acid is 60%, and then reducing the temperature of the waste sulfuric acid to normal temperature;

step two: conveying waste sulfuric acid with the molecular mass of 60% into a stirrer, wherein the negative pressure in the stirrer is 0.25MPa, the temperature is set to be 120-;

step three: then introducing the waste sulfuric acid with the molecular mass of 60 percent of the stirred sulfuric acid into an evaporator, directly raising the temperature to 160 ℃ for 15-20min, and then raising the temperature to 210 ℃ of 200 ℃ until the molecular mass of the sulfuric acid in the waste sulfuric acid is 95 percent;

step four: introducing concentrated sulfuric acid with the molecular mass of 95% into a filter, filtering insoluble substances in the waste sulfuric acid, and collecting the concentrated sulfuric acid to finish the treatment of the waste sulfuric acid.

2. The process of claim 1, wherein the sulfuric acid treatment process comprises the following steps: the heater in the first step is a graphite tube heater.

3. The process of claim 1, wherein the sulfuric acid treatment process comprises the following steps: and in the second step, the stirrer adopts a vacuum stirrer.

4. The process of claim 1, wherein the sulfuric acid treatment process comprises the following steps: and the evaporator in the third step adopts a glass-lined tube evaporator.

5. The process of claim 1, wherein the sulfuric acid treatment process comprises the following steps: and filtering the waste gas in the heating process in the first step and the third step by using a waste gas filtering device.

Technical Field

The invention relates to the technical field of waste sulfuric acid treatment, in particular to a treatment process of waste sulfuric acid on the surface of a metal product.

Background

The traditional treatment process of the waste sulfuric acid on the surface of the metal product is very complex, the purity of the treated sulfuric acid is low, impurities are accompanied, the subsequent treatment is needed, the cost is increased, and the treatment process is very troublesome, so an improved technology is urgently needed to solve the problem in the prior art.

Disclosure of Invention

The invention aims to provide a treatment process of waste sulfuric acid on the surface of a metal product, which adopts two-step heating and negative-pressure high-temperature stirring to obtain concentrated sulfuric acid with the molecular mass of 95%, has high purity and no impurities, realizes the reutilization of the concentrated sulfuric acid, and solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a treatment process of waste sulfuric acid on the surface of a metal product comprises the following steps:

the method comprises the following steps: placing the waste sulfuric acid into a heater, then raising the temperature to 60-65 ℃, continuing for 1-1.5h, raising the temperature to 85-90 ℃, continuing for 40-50min, then raising the temperature to 135-140 ℃ until the molecular mass of sulfuric acid in the waste sulfuric acid is 60%, and then reducing the temperature of the waste sulfuric acid to normal temperature;

step two: conveying waste sulfuric acid with the molecular mass of 60% into a stirrer, wherein the negative pressure in the stirrer is 0.25MPa, the temperature is set to be 120-;

step three: then introducing the waste sulfuric acid with the molecular mass of 60 percent of the stirred sulfuric acid into an evaporator, directly raising the temperature to 160 ℃ for 15-20min, and then raising the temperature to 210 ℃ of 200 ℃ until the molecular mass of the sulfuric acid in the waste sulfuric acid is 95 percent;

step four: introducing concentrated sulfuric acid with the molecular mass of 95% into a filter, filtering insoluble substances in the waste sulfuric acid, and collecting the concentrated sulfuric acid to finish the treatment of the waste sulfuric acid.

Preferably, the heater in the first step is a graphite tube heater.

Preferably, the stirrer in the second step adopts a vacuum stirrer.

Preferably, the evaporator in the third step adopts a glass-lined tube evaporator.

Preferably, the exhaust gas during the heating in the first step and the third step is filtered by an exhaust gas filtering device.

Compared with the prior art, the invention has the beneficial effects that:

the two-step heating is adopted, the middle part is stirred at high temperature under negative pressure, the obtained concentrated sulfuric acid with the molecular mass of 95 percent has high purity and no impurities, and the concentrated sulfuric acid is recycled.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described 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 technical scheme that: a treatment process of waste sulfuric acid on the surface of a metal product comprises the following steps:

the method comprises the following steps: placing the waste sulfuric acid into a graphite tube heater, then raising the temperature to 60-65 ℃, continuing for 1-1.5h, raising the temperature to 85-90 ℃, continuing for 40-50min, then raising the temperature to 135-140 ℃ until the molecular mass of sulfuric acid in the waste sulfuric acid is 60%, and then reducing the temperature of the waste sulfuric acid to normal temperature;

step two: conveying waste sulfuric acid with the molecular mass of 60% into a vacuum stirrer, wherein the negative pressure in the stirrer is 0.25MPa, the temperature is set to be 120-;

step three: then introducing the waste sulfuric acid with the molecular mass of 60 percent of the stirred sulfuric acid into the glass-lined tube evaporator, directly raising the temperature to 160 ℃ for 15-20min, and then raising the temperature to 210 ℃ for 200 ℃ until the molecular mass of the sulfuric acid in the waste sulfuric acid is 95 percent;

step four: introducing concentrated sulfuric acid with the molecular mass of 95% into a filter, filtering insoluble substances in the waste sulfuric acid, and collecting the concentrated sulfuric acid to finish the treatment of the waste sulfuric acid.

The first embodiment is as follows:

the waste sulfuric acid treatment process for the surface of the metal product comprises the following steps:

the method comprises the following steps: placing the waste sulfuric acid into a graphite tube heater, then raising the temperature to 60 ℃, keeping the temperature for 1.5h, raising the temperature to 85 ℃, keeping the temperature for 50min, then raising the temperature to 135 ℃ until the molecular mass of sulfuric acid in the waste sulfuric acid is 60%, and then reducing the temperature of the waste sulfuric acid to normal temperature;

step two: conveying waste sulfuric acid with the molecular mass of 60% into a vacuum stirrer, wherein the negative pressure in the stirrer is 0.25MPa, the temperature is set to be 120 ℃, the rotating speed is set to be 150r/min, and the time lasts for 10 min;

step three: then introducing the waste sulfuric acid with the molecular mass of 60% of the stirred sulfuric acid into a glass-lined tube evaporator, directly raising the temperature to 150 ℃, continuing for 15min, and then raising the temperature to 200 ℃ until the molecular mass of the sulfuric acid in the waste sulfuric acid is 95%;

step four: introducing concentrated sulfuric acid with the molecular mass of 95% into a filter, filtering insoluble substances in the waste sulfuric acid, and collecting the concentrated sulfuric acid to finish the treatment of the waste sulfuric acid.

Example two:

the waste sulfuric acid treatment process for the surface of the metal product comprises the following steps:

the method comprises the following steps: placing the waste sulfuric acid into a graphite tube heater, then raising the temperature to 65 ℃, continuing for 1h, raising the temperature to 90 ℃, continuing for 40min, then raising the temperature to 140 ℃ until the molecular mass of sulfuric acid in the waste sulfuric acid is 60%, and then reducing the temperature of the waste sulfuric acid to normal temperature;

step two: conveying waste sulfuric acid with the molecular mass of 60% into a vacuum stirrer, wherein the negative pressure in the stirrer is 0.25MPa, the temperature is set to be 130 ℃, the rotating speed is set to be 200r/min, and the stirring lasts for 5 min;

step three: then introducing the waste sulfuric acid with the molecular mass of 60% of the stirred sulfuric acid into a glass-lined tube evaporator, directly raising the temperature to 160 ℃, continuing for 15min, and then raising the temperature to 210 ℃ until the molecular mass of the sulfuric acid in the waste sulfuric acid is 95%;

step four: introducing concentrated sulfuric acid with the molecular mass of 95% into a filter, filtering insoluble substances in the waste sulfuric acid, and collecting the concentrated sulfuric acid to finish the treatment of the waste sulfuric acid.

Example three:

the waste sulfuric acid treatment process for the surface of the metal product comprises the following steps:

the method comprises the following steps: placing the waste sulfuric acid into a graphite tube heater, then raising the temperature to 62 ℃, continuing for 1h, raising the temperature to 87 ℃, continuing for 45min, then raising the temperature to 138 ℃ until the molecular mass of sulfuric acid in the waste sulfuric acid is 60%, and then reducing the temperature of the waste sulfuric acid to normal temperature;

step two: conveying waste sulfuric acid with the molecular mass of 60% into a vacuum stirrer, wherein the negative pressure in the stirrer is 0.25MPa, the temperature is set to be 125 ℃, the rotating speed is set to be 170r/min, and the time lasts for 8 min;

step three: then introducing the waste sulfuric acid with the molecular mass of 60% of the stirred sulfuric acid into a glass-lined tube evaporator, directly raising the temperature to 15 ℃, continuing for 18min, and then raising the temperature to 205 ℃ until the molecular mass of the sulfuric acid in the waste sulfuric acid is 95%;

step four: introducing concentrated sulfuric acid with the molecular mass of 95% into a filter, filtering insoluble substances in the waste sulfuric acid, and collecting the concentrated sulfuric acid to finish the treatment of the waste sulfuric acid.

Example four:

the waste sulfuric acid treatment process for the surface of the metal product comprises the following steps:

the method comprises the following steps: placing the waste sulfuric acid into a graphite tube heater, then raising the temperature to 60 ℃, continuing for 1h, raising the temperature to 85 ℃, continuing for 40min, then raising the temperature to 135 ℃ until the molecular mass of sulfuric acid in the waste sulfuric acid is 60%, and then reducing the temperature of the waste sulfuric acid to normal temperature;

step two: conveying waste sulfuric acid with the molecular mass of 60% into a vacuum stirrer, wherein the negative pressure in the stirrer is 0.25MPa, the temperature is set to be 120 ℃, the rotating speed is set to be 150r/min, and the stirring lasts for 5 min;

step three: then introducing the waste sulfuric acid with the molecular mass of 60% of the stirred sulfuric acid into a glass-lined tube evaporator, directly raising the temperature to 150 ℃, continuing for 15min, and then raising the temperature to 200 ℃ until the molecular mass of the sulfuric acid in the waste sulfuric acid is 95%;

step four: introducing concentrated sulfuric acid with the molecular mass of 95% into a filter, filtering insoluble substances in the waste sulfuric acid, and collecting the concentrated sulfuric acid to finish the treatment of the waste sulfuric acid.

Example five:

the waste sulfuric acid treatment process for the surface of the metal product comprises the following steps:

the method comprises the following steps: placing the waste sulfuric acid into a graphite tube heater, then raising the temperature to 65 ℃, keeping the temperature for 1.5h, raising the temperature to 90 ℃, keeping the temperature for 50min, then raising the temperature to 140 ℃ until the molecular mass of sulfuric acid in the waste sulfuric acid is 60%, and then reducing the temperature of the waste sulfuric acid to the normal temperature;

step two: conveying waste sulfuric acid with the molecular mass of 60% into a vacuum stirrer, wherein the negative pressure in the stirrer is 0.25MPa, the temperature is set to be 130 ℃, the rotating speed is set to be 200r/min, and the time lasts for 10 min;

step three: then introducing the waste sulfuric acid with the molecular mass of 60% of the stirred sulfuric acid into a glass-lined tube evaporator, directly raising the temperature to 160 ℃, continuing for 20min, and then raising the temperature to 210 ℃ until the molecular mass of the sulfuric acid in the waste sulfuric acid is 95%;

step four: introducing concentrated sulfuric acid with the molecular mass of 95% into a filter, filtering insoluble substances in the waste sulfuric acid, and collecting the concentrated sulfuric acid to finish the treatment of the waste sulfuric acid.

Through the first to fifth embodiments, the waste sulfuric acid on the surface of the metal product is treated, stepped heating is performed twice, negative-pressure high-temperature stirring is performed in the middle, the obtained concentrated sulfuric acid with the molecular mass of 95% is high in purity and free of impurities, and the concentrated sulfuric acid is recycled.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.