阅读说明：本技术 一种金属制品表面废硫酸污泥和废硫酸综合处理工艺 (Comprehensive treatment process for waste sulfuric acid sludge and waste sulfuric acid on surface of metal product ) 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污泥和废硫酸综合处理工艺,包括以下步骤：步骤一：将金属制品表面进行酸洗,步骤二：将污泥和废硫酸进行固液分离,步骤三：将污泥蒸发搅拌,直至污泥中的废硫酸变成结晶体,将步骤二中的废硫酸加入到蒸发器中,直至出现硫酸结晶体,步骤四：将步骤三中污泥中的结晶体和污泥进行筛分,水洗浸泡,将液体和污泥沉淀分离,随后再将液体加入蒸发釜中,将污泥压制成饼并烘干,步骤五：加入浓硫酸,实现有机物的碳化,再向搅拌罐中添加氧化剂,实现氧化,该发明处理工艺简单,使硫酸和污泥完全分离,且硫酸纯度较高,污泥中不含硫酸且PH值适中,可直接烘干运走并进行再利用,并且全程无污染,利于环境保护。(The invention discloses a comprehensive treatment process of waste sulfuric acid sludge and waste sulfuric acid on the surface of a metal product, which comprises the following steps: the method comprises the following steps: pickling the surface of the metal product, and performing the second step: and (3) carrying out solid-liquid separation on the sludge and the waste sulfuric acid, and carrying out the third step: evaporating and stirring the sludge until waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the step two into an evaporator until sulfuric acid crystals appear, and performing the step four: screening crystals and sludge in the third step, washing and soaking, precipitating and separating liquid and sludge, then adding the liquid into an evaporation kettle, pressing the sludge into cakes and drying, and performing the fifth step: the method has the advantages that the treatment process is simple, the sulfuric acid and the sludge are completely separated, the sulfuric acid purity is high, the sludge does not contain sulfuric acid, the pH value is moderate, the sludge can be directly dried and transported away and reused, the whole process is pollution-free, and the environmental protection is facilitated.)

1. A comprehensive treatment process of waste sulfuric acid sludge and 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: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;

step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;

step three: adding the sludge into an evaporation kettle, setting the temperature at 150-160 ℃, then setting the rotating speed at 30-40r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the step two into an evaporator, and setting the temperature at 120-130 ℃ until sulfuric acid crystals appear;

step four: screening crystals and sludge in the third step, washing and soaking the screened crystals, standing for 3-4h, separating liquid and sludge precipitate, adding the liquid into an evaporation kettle, setting the temperature to be 120 plus materials and 130 ℃ until sulfuric acid crystals appear, mixing the sludge precipitate and the sludge, adding the sludge precipitate and the sludge into a mixer, adding water into the mixer, setting the rotating speed to be 100 plus materials and 120r/min, continuing for 15-20min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying the sludge cakes away;

step five: mixing the sulfuric acid crystal in the fourth step with the sulfuric acid crystal in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid, setting the rotating speed of the stirring tank to be 200-250r/min to realize carbonization of organic matters, adding an oxidant into the stirring tank, setting the temperature to be 80-90 ℃, setting the rotating speed to be 220-250r/min, and continuing for 1-1.5 hours to realize oxidation, and collecting waste gas in the oxidation process.

2. The comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product, which is disclosed by claim 1, is characterized in that: and a stirrer is arranged in the evaporation kettle in the third step.

3. The comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product, which is disclosed by claim 1, is characterized in that: and in the fourth step, a washing pool is adopted for washing and soaking, and an inclined hole plate is arranged in the washing pool.

4. The comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product, which is disclosed by claim 1, is characterized in that: the concentration of the concentrated sulfuric acid in the fifth step is 60-65%.

5. The comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product, which is disclosed by claim 1, is characterized in that: and in the fifth step, sodium nitrite is used as an oxidant.

Technical Field

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

Background

Most of the existing comprehensive treatment processes for waste sulfuric acid sludge and waste sulfuric acid cannot completely separate sulfuric acid from sludge, the separated sulfuric acid and sludge have low purity, pollution can be generated in the processes, and the environment can be polluted, so that an improved technology is urgently needed to solve the problem in the prior art.

Disclosure of Invention

The invention aims to provide a comprehensive treatment process of waste sulfuric acid sludge and waste sulfuric acid on the surface of a metal product, so that sulfuric acid and sludge are completely separated, the purity of sulfuric acid is high, the sludge does not contain sulfuric acid, the pH value is moderate, the sludge can be directly dried and conveyed away for recycling, the whole process is pollution-free, the environment protection is facilitated, and the problems in the background technology are solved.

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

the method comprises the following steps: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;

step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;

step three: adding the sludge into an evaporation kettle, setting the temperature at 150-160 ℃, then setting the rotating speed at 30-40r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the step two into an evaporator, and setting the temperature at 120-130 ℃ until sulfuric acid crystals appear;

step four: screening crystals and sludge in the third step, washing and soaking the screened crystals, standing for 3-4h, separating liquid and sludge precipitate, adding the liquid into an evaporation kettle, setting the temperature to be 120 plus materials and 130 ℃ until sulfuric acid crystals appear, mixing the sludge precipitate and the sludge, adding the sludge precipitate and the sludge into a mixer, adding water into the mixer, setting the rotating speed to be 100 plus materials and 120r/min, continuing for 15-20min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying the sludge cakes away;

step five: mixing the sulfuric acid crystal in the fourth step with the sulfuric acid crystal in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid, setting the rotating speed of the stirring tank to be 200-250r/min to realize carbonization of organic matters, adding an oxidant into the stirring tank, setting the temperature to be 80-90 ℃, setting the rotating speed to be 220-250r/min, and continuing for 1-1.5 hours to realize oxidation, and collecting waste gas in the oxidation process.

Preferably, a stirrer is arranged in the evaporation kettle in the third step.

Preferably, a washing pool is adopted for washing and soaking in the fourth step, and an inclined hole plate is arranged in the washing pool.

Preferably, the concentration of the concentrated sulfuric acid in the step five is 60-65%.

Preferably, in the fifth step, sodium nitrite is used as the oxidizing agent.

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

the process of the invention completely separates the sulfuric acid from the sludge, has higher purity of the sulfuric acid, does not contain the sulfuric acid in the sludge, has moderate pH value, can be directly dried and transported away for recycling, has no pollution in the whole process and is beneficial to environmental protection.

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 comprehensive treatment process for waste sulfuric acid sludge and waste sulfuric acid on the surface of a metal product comprises the following steps:

the method comprises the following steps: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;

step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;

step three: adding the sludge into an evaporation kettle, setting the temperature at 150-160 ℃, then setting the rotating speed at 30-40r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the step two into an evaporator, and setting the temperature at 120-130 ℃ until sulfuric acid crystals appear;

step four: screening crystals and sludge in the third step, washing and soaking the screened crystals in water, soaking the crystals in a washing tank with an inclined hole plate, standing for 3-4h, separating liquid and sludge precipitates, then adding the liquid into an evaporation kettle, setting the temperature to be 120 plus materials and 130 ℃ until sulfuric acid crystals appear, mixing the sludge precipitates and the sludge, adding the sludge precipitates into a mixer, adding water into the mixer, setting the rotating speed to be 100 plus materials and 120r/min, continuing for 15-20min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying away the sludge cakes;

step five: mixing the sulfuric acid crystal in the fourth step with the sulfuric acid crystal in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 60-65%, setting the rotating speed of the stirring tank to be 200-fold organic chemicals at 250r/min to realize carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 80-90 ℃, setting the rotating speed to be 220-fold organic chemicals at 250r/min, and continuing for 1-1.5h to realize oxidation, and collecting waste gas in the oxidation process.

The first embodiment is as follows:

the comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product adopted by the embodiment comprises the following steps:

the method comprises the following steps: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;

step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;

step three: adding the sludge into an evaporation kettle, setting the temperature to be 150 ℃, then setting the rotating speed to be 30r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the step two into an evaporator, and setting the temperature to be 120 ℃ until sulfuric acid crystals appear;

step four: screening crystals and sludge in the third step, washing and soaking the screened crystals in water, soaking the crystals in a washing tank with an inclined hole plate, standing for 3 hours, separating liquid and sludge precipitates, then adding the liquid into an evaporation kettle, setting the temperature to be 120 ℃ until sulfuric acid crystals appear, mixing the sludge precipitates and the sludge, adding the sludge precipitates and the sludge into a mixer, adding water into the mixer, setting the rotating speed to be 100r/min, continuing for 15 minutes, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying the sludge cakes away;

step five: mixing the sulfuric acid crystal in the fourth step with the sulfuric acid crystal in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 60%, setting the rotating speed of the stirring tank to be 200r/min to realize carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 80 ℃, setting the rotating speed to be 220r/min, continuing for 1h to realize oxidation, and collecting waste gas in the oxidation process.

Example two:

the comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product adopted by the embodiment comprises the following steps:

the method comprises the following steps: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;

step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;

step three: adding the sludge into an evaporation kettle, setting the temperature to be 160 ℃, then setting the rotating speed to be 40r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the step two into an evaporator, and setting the temperature to be 130 ℃ until sulfuric acid crystals appear;

step four: screening crystals and sludge in the third step, washing and soaking the screened crystals in water, soaking the crystals in a washing tank with an inclined hole plate, standing for 4 hours, separating liquid and sludge precipitates, then adding the liquid into an evaporation kettle, setting the temperature to be 130 ℃ until sulfuric acid crystals appear, mixing the sludge precipitates and the sludge, adding the sludge precipitates and the sludge into a mixer, adding water into the mixer, setting the rotating speed to be 120r/min, continuing for 20min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying the sludge cakes away;

step five: mixing the sulfuric acid crystal in the fourth step with the sulfuric acid crystal in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 65%, setting the rotating speed of the stirring tank to be 250r/min to realize carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 80-90 ℃, setting the rotating speed to be 250r/min, continuing for 1.5 hours, realizing oxidation, and collecting waste gas in the oxidation process.

Example three:

the comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product adopted by the embodiment comprises the following steps:

the method comprises the following steps: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;

step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;

step three: adding the sludge into an evaporation kettle, setting the temperature to be 150 ℃, then setting the rotating speed to be 40r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the step two into an evaporator, and setting the temperature to be 120 ℃ until sulfuric acid crystals appear;

step four: screening crystals and sludge in the third step, washing and soaking the screened crystals in water, soaking the crystals in a washing tank with an inclined hole plate, standing for 3 hours, separating liquid and sludge precipitates, then adding the liquid into an evaporation kettle, setting the temperature to be 120 ℃ until sulfuric acid crystals appear, mixing the sludge precipitates and the sludge, adding the sludge precipitates and the sludge into a mixer, adding water into the mixer, setting the rotating speed to be 120r/min, continuing for 20 minutes, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying the sludge cakes away;

step five: mixing the sulfuric acid crystal in the fourth step with the sulfuric acid crystal in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 60%, setting the rotating speed of the stirring tank to be 200r/min to realize carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 80 ℃, setting the rotating speed to be 250r/min, continuing for 1h to realize oxidation, and collecting waste gas in the oxidation process.

Example four:

the comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product adopted by the embodiment comprises the following steps:

the method comprises the following steps: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;

step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;

step three: adding the sludge into an evaporation kettle, setting the temperature to be 160 ℃, then setting the rotating speed to be 30r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the step two into an evaporator, and setting the temperature to be 130 ℃ until sulfuric acid crystals appear;

step four: screening crystals and sludge in the third step, washing and soaking the screened crystals in water, soaking the crystals in a washing tank with an inclined hole plate, standing for 4 hours, separating liquid and sludge precipitates, then adding the liquid into an evaporation kettle, setting the temperature to be 130 ℃ until sulfuric acid crystals appear, mixing the sludge precipitates and the sludge, adding the sludge precipitates and the sludge into a mixer, adding water into the mixer, setting the rotating speed to be 120r/min, continuing for 15min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying the sludge cakes away;

step five: mixing the sulfuric acid crystal in the fourth step with the sulfuric acid crystal in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 60%, setting the rotating speed of the stirring tank to be 250r/min to realize carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 90 ℃, setting the rotating speed to be 220r/min, continuing for 1.5 hours to realize oxidation, and collecting waste gas in the oxidation process.

Example five:

the comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product adopted by the embodiment comprises the following steps:

the method comprises the following steps: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;

step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;

step three: adding the sludge into an evaporation kettle, setting the temperature to be 155 ℃, then setting the rotating speed to be 35r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the step two into an evaporator, and setting the temperature to be 125 ℃ until sulfuric acid crystals appear;

step four: screening crystals and sludge in the third step, washing and soaking the screened crystals in water, soaking the crystals in a washing tank with an inclined hole plate, standing for 3 hours, separating liquid and sludge precipitates, then adding the liquid into an evaporation kettle, setting the temperature to be 125 ℃ until sulfuric acid crystals appear, mixing the sludge precipitates and the sludge, adding the sludge precipitates and the sludge into a mixer, adding water into the mixer, setting the rotating speed to be 110r/min, continuing for 15 minutes, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying the sludge cakes away;

step five: mixing the sulfuric acid crystal in the fourth step with the sulfuric acid crystal in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 65%, setting the rotating speed of the stirring tank to be 220r/min to realize carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 85 ℃ and the rotating speed to be 230r/min, continuing for 1h to realize oxidation, and collecting waste gas in the oxidation process.

The comprehensive treatment process for the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the hardware product in the first embodiment is used for comprehensively treating the waste sulfuric acid and the sludge, so that the sulfuric acid and the sludge are completely separated, the purity of the sulfuric acid is high, the sludge does not contain sulfuric acid, the pH value is moderate, the sludge can be directly dried and conveyed away and recycled, and the whole process is pollution-free and is beneficial to environmental protection.

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.