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CN-121990852-A - Anti-caking agent and preparation method and application thereof

CN121990852ACN 121990852 ACN121990852 ACN 121990852ACN-121990852-A

Abstract

The invention discloses an anti-caking agent, a preparation method and application thereof. The anti-caking agent is prepared from the following components in percentage by mass. The raw materials used in the invention are easy to obtain, the cost is low, and the prepared anti-caking agent is suitable for different climatic conditions in the south and the north and can effectively inhibit caking of the soil conditioner. After the anti-caking agent is added, the caking rate of the sample is obviously reduced from 43.2 percent (blank control) to 4.8 percent within 30 days. In addition, the product is convenient to apply, simple to operate and small in addition amount.

Inventors

  • PAN ZHIGUO
  • CHEN YOUSHUN
  • SHI PIAN
  • SHI XIA
  • HE GUOKAI
  • HE LIGANG

Assignees

  • 武汉海力特科技股份有限公司

Dates

Publication Date
20260508
Application Date
20251231

Claims (10)

  1. 1. The anti-caking agent is characterized by being prepared from the following components, by mass, 70-75% of talcum powder, 13-18% of stearic acid, 4-7% of fumed silica and 3-5% of polyethylene glycol.
  2. 2. The anticaking agent of claim 1, wherein the polyethylene glycol has a number average molecular weight of 8000.
  3. 3. The anti-caking agent according to claim 1, wherein the talc has a fineness of 1250 mesh.
  4. 4. The method for preparing the anti-caking agent according to any one of claims 1-3, which is characterized by comprising the steps of mixing talcum powder, stearic acid, fumed silica and polyethylene glycol which are weighed according to the formula proportion, heating to 105-115 ℃ and stirring for modification, cooling after modification is completed, and discharging.
  5. 5. The method for preparing an anti-caking agent according to claim 4, wherein the stirring speed is 1000-1200 r/min.
  6. 6. The method for preparing an anti-caking agent according to claim 4, wherein the stirring and modifying time is 35-45 min.
  7. 7. The method for preparing the anti-caking agent according to claim 4, wherein the modified product is discharged after being cooled to a temperature of less than or equal to 35 ℃.
  8. 8. The use of the anti-caking agent according to any one of claims 1 to 3 as an anti-caking agent for phosphogypsum soil conditioner.
  9. 9. The method of claim 8, wherein the method comprises the step of uniformly mixing phosphogypsum soil improver with the anti-caking agent.
  10. 10. The use according to claim 9, wherein the addition amount of the anti-caking agent in the phosphogypsum soil conditioner is x, 0.15wt% or less x <0.2wt% when the water content of the phosphogypsum soil conditioner is <8%, 0.2wt% or less x <0.3wt% when the water content of the phosphogypsum soil conditioner is 8-12%, and 0.3wt% or less x < 0.35wt% when the water content of the phosphogypsum soil conditioner is > 12%.

Description

Anti-caking agent and preparation method and application thereof Technical Field The invention relates to the technical field of powder material anti-caking, in particular to an anti-caking agent, a preparation method and application thereof. Background Phosphogypsum is a byproduct generated in the production process of wet-process phosphoric acid, is one of the solid wastes with the largest discharge amount in the chemical industry, and mainly comprises calcium sulfate dihydrate. Phosphogypsum has complex composition, and besides calcium sulfate, phosphorus ore which is not completely decomposed, residual phosphoric acid, fluoride, acid insoluble substances, organic matters and the like, wherein the presence of fluorine and organic matters has the greatest influence on the recycling of phosphogypsum. The random discharge and accumulation of phosphogypsum seriously damages the ecological environment, not only pollutes the underground water resource, but also causes the waste of land resource. Agricultural activities are not separated from the use of fertilizers, but long-term application of fertilizers can lead to soil degradation and even loss of cultivation capacity, so that improvement of soil is needed. Phosphogypsum can effectively regulate the pH value of soil, supplement nutrients such as sulfur, calcium and the like, improve the soil structure, and enhance the bioactivity and the saline-alkali resistance of the soil. In order to realize the reutilization of the waste phosphogypsum, the waste phosphogypsum is gradually applied to the improvement and restoration of the degraded soil. Phosphogypsum has received much attention in recent years as a soil conditioner. However, due to its own characteristics, many challenges remain in practical applications. For example, phosphogypsum-based soil amendments are susceptible to caking under factors such as air humidity (summer relative humidity 60-85%), temperature, storage conditions, and the like. The agglomerated materials must be subjected to re-crushing and sieving treatments, which not only increases the cost, but also brings inconvenience to production and application. Therefore, there is a need to develop a highly effective anti-caking agent suitable for phosphogypsum soil amendments. Disclosure of Invention Aiming at the defects, the invention aims to provide an anti-caking agent, a preparation method and application thereof, which are used for solving the problems that the existing phosphogypsum soil conditioner is easy to generate caking phenomenon and the like. The aim of the invention is achieved by the following technical scheme: the anti-caking agent is prepared from the following components in percentage by mass: 70-75% of talcum powder, 13-18% of stearic acid, 4-7% of fumed silica and 3-5% of polyethylene glycol. In the invention, talcum powder is used as a carrier of the anti-caking agent, stearic acid is used as a modifier for improving the hydrophobicity and anti-adhesion performance of the anti-caking agent, fumed silica has anti-agglomeration effect and can improve the fluidity of powder, and polyethylene glycol is used for enhancing the adhesive force of the anti-caking agent on the surface of the powder. Preferably, the polyethylene glycol has a number average molecular weight of 8000. Preferably, the fineness of the talcum powder is 1250 meshes. The anti-caking agent prepared by the invention is white superfine powder, has uniform appearance and no caking visible to naked eyes. The hydrophobic rate is not lower than 94%, the bulk density is 0.75-0.85 g/cm 3, the particle size distribution D90 is less than or equal to 30 μm, and the particle size is stable below 200 ℃ without obvious decomposition. The physical property combination ensures that the powder soil conditioner has good matching performance with the powder soil conditioner in the aspects of particle size, density and thermal stability, and is convenient for realizing uniform blending. The principle of the test of the hydrophobicity of the anti-caking agent, the instruments and reagents used for the test, the test steps and the calculation formula are as follows: 1. Principle of The water repellency of the powder is characterized by measuring the proportion of the powder mass which is not wetted by water to the total mass after the powder is contacted with water, and the higher the water repellency, the stronger the moisture absorption resistance and the anti-caking capacity of the powder. 2. Reagents and apparatus 1. Reagent deionized water 2. The instrument comprises an electronic balance (precision 0.001 g), a standard sieve (20 meshes), a beaker (250 mL), a vacuum filtration device and an oven 3. Test procedure 1. Sample pretreatment And (3) taking modified powder to be detected (such as phosphogypsum powder added with an anti-caking agent), drying in a baking oven at 105+/-2 ℃ to constant weight, cooling to room temperature, sieving with a 20-mesh sieve, and removing larg