| 摘要 |
<p>The invention relates to universal filter elements of valve-free, gas-proof respirators intended for protecting the respiratory organs from harmful substances found in the air of manufacturing facilities of aluminium and phosphorus plants, mineral fertilizers and nonferrous metallurgy. A known universal filter element composition comprising: 17.0 - 25.0% by mass of potassium carbonate; 0.7 - 1.0% by mass of sodium hydroxide; 9.0 - 12.5% by mass of sodium silicate; 9.0 - 12.5% by mass of glycerin; 5.9 - 7.4% by mass of water; with the remainder being cotton cloth, does not provide effective protection against sulphur dioxide in excess of 15 MAC. Owing to the fact that the proposed composition additionally comprises calcium oxide and manganese sulphate in the following ratio of components: 22.0 - 32.0% by mass of potassium carbonate; 0.8 - 1.1% by mass of calcium oxide; 1.0 - 1.5% by mass of sodium hydroxide; 10.0 - 14.0% by mass of sodium silicate; 9.0 - 13.0% by mass of glycerin; 0.07 - 0.12% by mass of manganese sulphate; 12.0 - 16.0% by mass of water; with the remainder being cotton cloth, it is possible to increase the absorption capacity of the filter, the degree of protection against sulphur dioxide and additional retention of hydrogen sulphide, thus making it possible to effectively use the filter for protecting the respiratory organs in manufacturing facilities where the content of sulphur dioxide exceeds 15 MAC, that of hydrogen sulphide exceeds 15 MAC, and the content of hydrogen fluoride reaches 30 MAC.</p> |
