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Scale inhibitor and dispersant for wet process phosphoric acid filter system

A technology of anti-scaling dispersant and filter system, which is applied in the field of anti-scaling dispersant, can solve the problems such as fouling of the filter system, and achieve the effect of convenient use, good application prospect and simple preparation method

Active Publication Date: 2013-08-21
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of anti-scaling dispersant for wet-process phosphoric acid filtration system in order to improve the deficiencies of the prior art, mainly to solve the problem of fouling of the filtration system in the production process of wet-process phosphoric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Based on the total mass of raw materials, the scale inhibitor and dispersant consists of 15% 2-phosphonic acid-1,2,4-tricarboxylic butane, 50% phosphine-containing polymaleic acid, acrylic acid / 2-acrylamide- 25% of 2-methylpropanesulfonic acid copolymer, 0.05% of aluminum sulfate, and 9.95% of water form a mixture. After stirring evenly, the scale inhibitor dispersant is obtained; the dosage is 50ppm in the phosphoric acid filtration system. Taking the production of phosphoric acid as an example, after adding the scale inhibitor dispersant of the present invention, the scale inhibition rate is 80%.

Embodiment 2

[0017] Based on the total mass of raw materials, the scale inhibitor dispersant consists of 5% amino trimethylene phosphonic acid, 60% hydrolyzed phosphinopolymaleic acid, acrylic acid / 2-acrylamido-2-methylpropanesulfonic acid / acrylic acid hydroxyl Propyl ester copolymer 30%, aluminum chloride 0.30%, the mixture that water 4.7% forms, after stirring evenly, add in the phosphoric acid filter system with the dosage of 200ppm, take the production of certain wet-process phosphoric acid in Hubei as an example, add the resistance After adding scale dispersant, the scale inhibition rate was 88%.

Embodiment 3

[0019] Based on the total mass of raw materials, the scale inhibitor and dispersant consists of 10% polyamino polyether methylene phosphonic acid, 50% phosphonosuccinic acid, maleic acid / 2-acrylamido-2-methylpropanesulfonic acid / acrylic acid copolymer 35%, aluminum nitrate 0.50%, water 4.5% composition mixture, after stirring evenly, add in wet-process phosphoric acid production filter system with 100ppm, take Hubei certain wet-process phosphoric acid production as example, add the present invention After anti-scaling dispersant, the anti-scaling rate is 85%.

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PUM

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Abstract

The invention relates to a scale inhibitor and dispersant for a wet process phosphoric acid filter system. The scale inhibitor and dispersant is characterized by comprising the following raw material components in percentage by weight: 5%-15% of organic phosphoric acid, 40%-65% of phosphorus-containing polymer, 25%-40% of sulfonic acid copolymer, 0.05%-0.5% of aluminum slat and 4-10% of water. The adding amount of the scale inhibitor and dispersant is 0.005%-0.02% of wet process phosphoric acid; and the scale inhibitor and dispersant disclosed by the invention can effectively prevent the scale formation phenomenon of the filter system during the production of the phosphoric acid, has no influence on subsequent working sections and has good application prospects.

Description

technical field [0001] The invention relates to a scale-inhibiting dispersant, in particular to a scale-inhibiting dispersant used in a wet-process phosphoric acid filter system. Background technique [0002] The main components of the scale produced by the vacuum filtration system in the wet-process phosphoric acid production process are sodium (potassium) fluorosilicate and calcium sulfate. This is due to the K + 、Na + , Ca 2+ and other metal ions and SiF 6 2- , SO 4 2- Combined to form precipitated crystalline salts. Such deposits tend to accumulate in pump casings and valves in actual production, resulting in problems such as reduced pump flow and out-of-control instrument valves, especially affecting the filtration rate of phosphogypsum and the continuous production of the device. This not only brings a great burden to production, but also causes economic losses due to interruption of production. At present, there is no effective solution to this common problem...

Claims

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Application Information

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IPC IPC(8): C01B25/22
Inventor 尹晓爽沈香花杨文忠刘瑛徐斌
Owner NANJING UNIV OF TECH
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