Contact with its vapor or smoke can cause acute poisoning, conjunctivitis, burning sensation of nasal cavity and oral mucosa, nosebleed, gingival bleeding, tracheitis and so on. Incorrect intake will lead to digestive tract burns, ulcer formation, and may lead to gastric perforation and peritonitis.
Skin contact with eyes can cause burns. Chronic effects: Long-term exposure can lead to chronic rhinitis, chronic bronchitis, tooth erosion and skin damage. Environmental hazard: it is harmful to the environment and can pollute water and soil. Danger of explosion: this product is nonflammable, highly corrosive and irritating, and can cause burns to human body.
Toxicological data and acute toxicity of environmental behavior: LD50900mg/kg (through rabbit mouth); Hazard characteristics of LC503 124ppm, 1 hour (inhaled by rats): it can react with some active metal powders and release hydrogen. When cyanide is encountered, it can produce highly toxic hydrogen cyanide gas. Neutralization reaction with alkali, releasing a lot of heat. It is very corrosive.
Extended data:
Control and determination of optimal hydrochloric acid concentration
Practice has proved that it is difficult to control the concentration range of hydrochloric acid too narrow and too wide. According to the continuous production practice and the influence of human factors, we think it is recommended to control the concentration of hydrochloric acid at 8% ~ 13%, the temperature of acid residue at 20 ~ 40℃ and the specific gravity of acid solution at L35 ~ 1.20.
It can better meet the needs of production and prolong the service life of acid liquor to the maximum extent. If the content of FeCl2 _ 2 _ 2 is high (which can be expressed by the specific gravity of hydrochloric acid), the degree of hydrochloric acid can be correspondingly low. FeCl2 content is low, and hydrochloric acid concentration can be high.
In the specific operation, it is necessary to supplement new acid to prevent the natural decrease of acid concentration and acid position at all times. When adding acid, be sure to be diligent and less. E9 acid Ⅱ should be used frequently, and the amount of acid added should be less each time.
If the curing speed is slow in winter, it can be heated to 20 ~ 25℃. When the content of FeC 12 is too high and the specific gravity of acid solution exceeds 1.35, it can be diluted with water until the specific gravity of acid solution is not more than 1.22. The control and determination of the concentration of hydrochloric acid pickling solution can be tested by conventional chemical analysis methods.
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