Defoamer for wet-process phosphoric acid production and production method thereof

Abstract

The invention discloses a defoamer for wet-process phosphoric acid production, which is characterized by consisting of the following components in parts by weight: 30-100 parts of mineral oil, 1-30 parts of ethers, 1-20 parts of carboxylates, 1-10 parts of an emulsifier and 1-10 parts of an inorganic salt. A preparation method of the defoamer for wet-process phosphoric acid production comprises the steps of pre-emulsifying the ethers and the carboxylates by using the compound emulsifier; then mixing with the mineral oil and the inorganic salt; and finally emulsifying, grinding, homogenizing and thinning to obtain the defoamer for wet-process phosphoric acid production. According to the invention, the production process of the product is simple, the production control is simple and convenient and the conditions are not overcritical; the product does not influence the qualities of phosphoric acid products, has good environmental compatibility and does not pollute the environment; the product is low in surface tension, quick for defoaming, long in foam inhibition time and less in dosage; and the raw material sources are wide, the cost is suitable and the performance price ratio is high. The defoamer is not only suitable for wet-process phosphoric acid production, but also suitable for acidic medium defoaming and foam inhibition in the industries of spinning, printing and dyeing and the like.

Description

technical field

[0001] The invention relates to the field of industrial defoamers, in particular to a defoamer used for wet-process phosphoric acid production and a production method thereof, which takes mineral oil as a carrier. Background technique

[0002] Phosphoric acid is mainly used in fertilizer and industrial phosphate production. The industrial production methods of phosphoric acid mainly include wet method and thermal method. The wet-process phosphoric acid production method is suitable for the use of medium and low-grade phosphate rock raw materials. At present, more than 80% of phosphoric acid in my country is produced by wet process. The raw materials used in wet-process phosphoric acid production are phosphate rock powder and sulfuric acid. Phosphate rock powder contains carbonate (CaCO 3 , MgCO 3 ), oxides (Al 2 o 3 , Fe 2 o 3 ), silicates, acid insolubles and organic matter. When phosphate rock powder reacts with sulfuric acid, a large amount of gas...

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