阅读说明：本技术 一种用有机酸酸洗活性炭的方法 (Method for pickling activated carbon by using organic acid ) 是由 张小宁 张志清 王晖 于 2021-01-26 设计创作，主要内容包括：本发明属于活性炭生产领域,具体包括一种用有机酸酸洗活性炭的方法,机酸代替无机酸生产酸洗活性炭的工艺,可生产同样的产品性能,同时操作人员的人身安全得到保障、废液得到有效排放。目前该技术已在我公司推广使用,效果显著。根据实际使用结果来看,采用该技术后完全可以代替盐酸使用,满足产品要求；保障了工人人身安全、废液排放更加容易达到环保要求。(The invention belongs to the field of activated carbon production, and particularly relates to a method for pickling activated carbon by organic acid, which is a process for producing pickled activated carbon by using organic acid instead of inorganic acid, can produce the same product performance, and simultaneously ensures the personal safety of operators and effectively discharges waste liquid. At present, the technology is popularized and used in our company, and the effect is obvious. According to the actual use result, the technology can completely replace hydrochloric acid to be used, and the product requirement is met; the personal safety of workers is guaranteed, and the waste liquid discharge can more easily meet the environmental protection requirement.)

1. A method for pickling activated carbon by using organic acid is characterized by comprising the following steps: the specific production steps are as follows:

the first step is as follows: preparing acid liquor: adding a proper amount of water into a pickling tank, adding an acetic acid solution into the pickling tank, and preparing the acetic acid solution with the concentration less than or equal to 5 percent, wherein water is added firstly, and then acetic acid is added;

the second step is that: acid washing, namely heating the prepared acid solution and keeping the temperature to 60-80 ℃, adding activated carbon to be washed into the acid solution, wherein the surface of the acid solution is 100-300mm higher than the material surface, and fully stirring for 1-6 hours;

the third step: rinsing, namely after pickling is finished, discharging pickling solution, rinsing, adding tap water into a pickling tank until the temperature is 100-300mm above the surface of the material, heating to 70-90 ℃ by using steam, fully stirring, preserving heat for 30 minutes, and then changing water to continue rinsing until the pH value of the cleaning solution reaches about 6;

the fourth step: discharging the waste liquid, and neutralizing the waste liquid after acid washing and water washing by using a sodium hydroxide solution and then carrying out subsequent sewage treatment;

the fifth step: drying, namely drying the activated carbon subjected to acid washing and water washing by using a drying furnace to ensure that the water content reaches 5-10%;

and a sixth step: and (4) screening and packaging, wherein the dried finished product material must be screened, dedusted and packaged according to the specification of the granularity requirement.

2. The method for pickling activated carbon with organic acid according to claim 1, wherein: the calculation formula of the concentration of the acetic acid solution is W ═ mass of acetic acid x percentage content of acetic acid/(mass of water + mass of acetic acid) x 100%.

3. The method for pickling activated carbon with organic acid according to claim 1, wherein: in the fifth step, the temperature in the drying furnace is 250-450 ℃.

The technical field is as follows:

the invention belongs to the field of activated carbon production, and particularly relates to a method for pickling activated carbon by using organic acid.

Background art:

in the production process of the activated carbon, ash in the activated carbon needs to be treated according to application requirements, and the existing activated ash reduction production process basically uses hydrochloric acid for acid cleaning. The process uses an aqueous solution of hydrochloric acid which is hydrogen chloride (HCl) gas as a colorless and transparent monobasic strong acid. Hydrochloric acid has strong volatility and corrosivity, causes health hazards to personnel in the using process, and can cause acute poisoning, conjunctivitis, burning sensation of nasal and oral mucosa, trachitis and the like when contacting steam or smoke of the hydrochloric acid. Contact between the eye and the skin can cause burns.

The invention content is as follows:

the invention uses acetic acid or citric acid to replace hydrochloric acid to achieve the same ash reduction effect, and the acetic acid is an organic monobasic acid which is a weak acid and also plays the same ash reduction role in the activated carbon pickling process.

A method for pickling activated carbon by using organic acid comprises the following specific production steps:

the first step is as follows: preparing acid liquor: adding a proper amount of water into a pickling tank, adding an acetic acid solution into the pickling tank, and preparing the acetic acid solution with the concentration less than or equal to 5 percent, wherein water is added firstly, and then acetic acid is added;

the second step is that: acid washing, namely heating the prepared acid solution and keeping the temperature to 60-80 ℃, adding activated carbon to be washed into the acid solution, wherein the surface of the acid solution is 100-300mm higher than the material surface, and fully stirring for 1-6 hours;

the third step: rinsing, namely after pickling is finished, discharging pickling solution, rinsing, adding tap water into a pickling tank until the temperature is 100-300mm above the surface of the material, heating to 70-90 ℃ by using steam, fully stirring, preserving heat for 30 minutes, and then changing water to continue rinsing until the pH value of the cleaning solution reaches about 6;

the fourth step: discharging the waste liquid, and neutralizing the waste liquid after acid washing and water washing by using a sodium hydroxide solution and then carrying out subsequent sewage treatment;

the fifth step: drying, namely drying the activated carbon subjected to acid washing and water washing by using a drying furnace to ensure that the water content reaches 5-10%;

and a sixth step: and (4) screening and packaging, wherein the dried finished product material must be screened, dedusted and packaged according to the specification of the granularity requirement.

Preferably, the acetic acid solution concentration is calculated by the formula W ═ mass of acetic acid × percentage content of acetic acid/(mass of water + mass of acetic acid) × 100%.

Preferably, the temperature in the drying furnace is 250-450 ℃.

The invention relates to a process for producing acid-washing activated carbon by using organic acid instead of inorganic acid, which can produce the same product performance, ensure the personal safety of operators and effectively discharge waste liquid. At present, the technology is popularized and used in our company, and the effect is obvious. According to the actual use result, the technology can completely replace hydrochloric acid to be used, and the product requirement is met; the personal safety of workers is guaranteed, and the waste liquid discharge can more easily meet the environmental protection requirement.

The specific implementation mode is as follows:

the first embodiment is as follows:

a method for pickling activated carbon by using organic acid comprises the following specific production steps:

the first step is as follows: preparing acid liquor: adding a proper amount of water into a pickling tank, adding an acetic acid solution into the pickling tank to prepare an acetic acid solution with the concentration of 5%, and adding water and then acetic acid;

the second step is that: acid cleaning, namely heating the prepared acid solution and keeping the temperature to 60 ℃, adding the activated carbon to be cleaned into the acid solution, wherein the surface of the acid solution is 100mm higher than the discharge surface, and fully stirring for 1 hour;

the third step: rinsing, namely after pickling, discharging pickling solution, rinsing, adding tap water into a pickling tank until the material level is 100mm above, heating to 70 ℃ by using steam, fully stirring, preserving heat for 30 minutes, and then changing water to rinse continuously until the pH value of the cleaning solution reaches about 6;

the fourth step: discharging the waste liquid, and neutralizing the waste liquid after acid washing and water washing by using a sodium hydroxide solution and then carrying out subsequent sewage treatment;

the fifth step: drying, namely drying the activated carbon subjected to acid washing and water washing by using a drying furnace to ensure that the water content reaches 5%;

and a sixth step: and (4) screening and packaging, wherein the dried finished product material must be screened, dedusted and packaged according to the specification of the granularity requirement.

Wherein, the calculation formula of the concentration of the acetic acid solution is W ═ mass of acetic acid x percentage content of acetic acid/(mass of water + mass of acetic acid) x 100%. The temperature in the drying furnace is 250 ℃.

Example two:

a method for pickling activated carbon by using organic acid comprises the following specific production steps:

the first step is as follows: preparing acid liquor: adding a proper amount of water into a pickling tank, adding an acetic acid solution into the pickling tank to prepare an acetic acid solution with the concentration of 3%, and adding water and then acetic acid;

the second step is that: acid cleaning, namely heating the prepared acid solution and keeping the temperature to 70 ℃, adding the activated carbon to be cleaned into the acid solution, wherein the surface of the acid solution is 200mm higher than the discharge surface, and fully stirring for 3 hours;

the third step: rinsing, namely after pickling, discharging pickling solution, rinsing, adding tap water into a pickling tank until the pH value of the cleaning solution reaches about 6 until the thickness of the material is 200mm above the surface of the material, heating the material to 80 ℃ by using steam, fully stirring the material, preserving the temperature for 30 minutes, and then changing water to rinse continuously until the pH value of the cleaning solution reaches about 6;

the fourth step: discharging the waste liquid, and neutralizing the waste liquid after acid washing and water washing by using a sodium hydroxide solution and then carrying out subsequent sewage treatment;

the fifth step: drying, namely drying the activated carbon subjected to acid washing and water washing by using a drying furnace to ensure that the water content reaches 5-10%;

and a sixth step: and (4) screening and packaging, wherein the dried finished product material must be screened, dedusted and packaged according to the specification of the granularity requirement.

Wherein, the calculation formula of the concentration of the acetic acid solution is W ═ mass of acetic acid x percentage content of acetic acid/(mass of water + mass of acetic acid) x 100%. The temperature in the drying furnace is 350 ℃.

Example three:

a method for pickling activated carbon by using organic acid comprises the following specific production steps:

the first step is as follows: preparing acid liquor: adding a proper amount of water into a pickling tank, adding an acetic acid solution into the pickling tank to prepare the acetic acid solution with the concentration of 1%, and adding water and then adding acetic acid;

the second step is that: acid washing, namely heating the prepared acid solution and preserving the temperature to 80 ℃, adding activated carbon to be washed into the acid solution, wherein the surface of the acid solution is 300mm higher than the discharge surface, and fully stirring for 6 hours;

the third step: rinsing, namely after pickling, discharging pickling solution, rinsing, adding tap water into a pickling tank until the material level is 300mm above, heating to 90 ℃ by using steam, fully stirring, preserving heat for 30 minutes, and then changing water to continuously rinse until the pH value of the cleaning solution reaches about 6;

the fourth step: discharging the waste liquid, and neutralizing the waste liquid after acid washing and water washing by using a sodium hydroxide solution and then carrying out subsequent sewage treatment;

the fifth step: drying, namely drying the activated carbon subjected to acid washing and water washing by using a drying furnace to ensure that the water content reaches 10%;

and a sixth step: and (4) screening and packaging, wherein the dried finished product material must be screened, dedusted and packaged according to the specification of the granularity requirement.

Wherein, the calculation formula of the concentration of the acetic acid solution is W ═ mass of acetic acid x percentage content of acetic acid/(mass of water + mass of acetic acid) x 100%. The temperature in the drying furnace is 450 ℃.