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CN-122010514-A - Anti-bleeding phosphogypsum-based filling material and preparation method thereof

CN122010514ACN 122010514 ACN122010514 ACN 122010514ACN-122010514-A

Abstract

The invention discloses an anti-bleeding phosphogypsum base filling material and a preparation method thereof, wherein the anti-bleeding phosphogypsum base filling material is prepared from a cementing material, an aggregate, water and an additive, the cementing material is wet phosphoric acid byproduct semi-hydrated phosphogypsum, the aggregate is composed of dihydrate phosphogypsum and quicklime, and the additive is superfine active micro powder composed of 32.5 cement, phosphogypsum, fly ash and limestone, and the anti-bleeding phosphogypsum base filling material has the cementing activity and the pozzolanic effect. Aiming at the semi-hydrated phosphogypsum with high bleeding performance, the additive with gelling activity and pozzolan effect is used, so that the bleeding performance of the existing phosphogypsum-based filling slurry is improved, the compressive strength of the filling body is improved, the environmental protection performance is ensured, and meanwhile, the filling cost is reduced.

Inventors

  • WU LIBO
  • CHEN KANG
  • CHEN JIAJUN
  • CAI ZESHU
  • XU JINLONG
  • HUANG ZHENGPING
  • WANG JIACAI
  • LI ZIJUN

Assignees

  • 贵州川恒化工股份有限公司

Dates

Publication Date
20260512
Application Date
20251224

Claims (10)

  1. 1. The anti-bleeding phosphogypsum-based filling material is characterized by being prepared from a cementing material, an aggregate, water and an additive; The cementing material, the aggregate and the water are calculated according to the mass percentage, wherein the cementing material accounts for 20-60% of the total amount, the aggregate accounts for 60-20% of the total amount, and the water accounts for 20-26% of the total amount; The additive accounts for 6-8% of the mass of the cementing material; the cementing material is wet-process phosphoric acid byproduct phosphogypsum, and the dosage of quicklime in the aggregate is 3-5% of the mass of the dihydrate gypsum; the aggregate consists of phosphogypsum dihydrate and quicklime; The additive is prepared by mixing 32.5 cement, phosphogypsum, fly ash and limestone according to the mass ratio of 55-65:2.8-3.2:20-22:15-17 to form superfine active micro powder.
  2. 2. The bleeding-resistant phosphogypsum-based filling material is characterized in that the cementing material, the aggregate and the water account for 25-50% of the total weight of the cementing material, 50-25% of the aggregate and 20-25% of the total weight of the water in percentage by mass.
  3. 3. The anti-bleeding phosphogypsum-based filling material according to claim 1, wherein the free water content of the semi-hydrated phosphogypsum is 20-25%, and the crystal water content is 6.5-8%.
  4. 4. An anti-bleeding phosphogypsum based filling material as claimed in claim 1, wherein the amount of quicklime in the aggregate is 4% by mass of the dihydrate gypsum.
  5. 5. The anti-bleeding phosphogypsum-based filling material according to claim 1, wherein the additive is added in an amount of 7% of the mass of the cementing material, the mass ratio of 32.5 cement, phosphogypsum, fly ash and limestone in the additive is 60:3:21:16, and the particle size of the additive is less than 38 μm.
  6. 6. The anti-bleeding phosphogypsum-based filling material according to claim 1, wherein the concentration of the anti-bleeding phosphogypsum-based filling material is 70-80%.
  7. 7. The method for preparing the anti-bleeding phosphogypsum-based filling material according to any one of claims 1 to 6, which is characterized by comprising the following steps of; (1) Mixing 32.5 cement, phosphogypsum, fly ash and limestone with abrasive particles, and sieving with a 350-450 mesh sieve to obtain an additive for later use; (2) And mixing and stirring the cementing material, the aggregate and the additive for 20-35 s, then slowly adding water for 20-35 s, and stirring for 160-200 s to obtain the bleeding-resistant phosphogypsum-based filling material.
  8. 8. The filling material of claim 7, wherein in the step (1), the mixture of the cement, phosphogypsum, fly ash and limestone is taken as 32.5 abrasive particles, and the mixture is sieved by a 400-mesh sieve to obtain the additive for later use.
  9. 9. The method for preparing the bleeding-resistant phosphogypsum-based filling material according to claim 7, wherein in the step (2), the cementing material, the aggregate and the additive are mixed and stirred for 30s, water is slowly added for 20-30 s, and then the mixture is stirred for 175-185 s to prepare the bleeding-resistant phosphogypsum-based filling material.
  10. 10. The method of preparing an anti-bleeding phosphogypsum-based filling material according to claim 9, wherein in the step (2), the cementing material, the aggregate and the additive are mixed and stirred for 30s, water is slowly added for 25s, and stirring is carried out for 180s, so as to prepare the anti-bleeding phosphogypsum-based filling material.

Description

Anti-bleeding phosphogypsum-based filling material and preparation method thereof Technical Field The invention belongs to the technical field of mine filling materials, and particularly relates to an anti-bleeding phosphogypsum-based filling material and a preparation method thereof. Background Cement cemented filling is the most common goaf treatment mode currently applied at home and abroad, cement is used as a filling cementing agent, the cost of the cement cemented filling accounts for about 70% of the filling cost, and the filling cost is high. And the price of the phosphorite is low, and most mines cannot bear high filling cost. The semi-hydrated phosphogypsum has good gelling activity, has the possibility of replacing cement, or can become a breakthrough point for transformation and upgrading of phosphorus chemical industry enterprises, the existing phosphogypsum filling technology relies on the semi-hydrated phosphogypsum with gelling property and longer setting time, the cost of the semi-hydrated phosphogypsum is greatly reduced compared with the cost of cement cementing filling, but the bleeding rate deviation of the semi-hydrated phosphogypsum is larger because the transportation, storage and conveying requirements are required to be ensured, and the compression strength of the semi-hydrated phosphogypsum with larger bleeding rate is lower, if the low bleeding rate and the high strength are required to be maintained, the mine filling cost is also increased. Therefore, the existing phosphogypsum-based filling slurry has the problems of overlarge bleeding rate, lower compressive strength and higher cost of adding additives. Meanwhile, the semi-hydrated gypsum is unstable in performance and complex in filling station environment, so that the unstable performance of filling slurry is caused, the traditional filling slurry is poor in anti-interference capability, the slurry sedimentation rate is high easily, the pumping capability is poor, the occurrence of pipe blockage accidents is seriously caused, and the requirement of stable filling of a modern mine is difficult to meet. Therefore, there is a need for phosphogypsum-based mine filling materials which can realize high bleeding resistance, high interference resistance, stable slurry performance and high filling body strength. According to the invention, aiming at the semi-hydrated phosphogypsum with high bleeding performance, the gelation property of the semi-hydrated phosphogypsum is combined with a paste filling mining technology, the semi-hydrated phosphogypsum is taken as a filling cementing material, other solid waste materials are fully utilized as aggregate, and the harmless full-solid waste paste which is not layered, is not isolated, is not dehydrated and has good bleeding resistance is prepared, so that safe and efficient mining of phosphorite is performed, and meanwhile, harmless bulk utilization and disposal of phosphogypsum are realized. Disclosure of Invention The invention aims to provide an anti-bleeding phosphogypsum base filling material and a preparation method thereof, aiming at semi-hydrated phosphogypsum with high bleeding performance, an additive with gelling activity and pozzolan effect is used, the bleeding property of the existing phosphogypsum base filling slurry is improved, the compressive strength of a filling body is improved, the environmental protection performance is ensured, and meanwhile, the filling cost is reduced. The technical scheme of the invention is as follows: an anti-bleeding phosphogypsum-based filling material is prepared from a cementing material, aggregate, water and an additive; The cementing material, the aggregate and the water are calculated according to the mass percentage, wherein the cementing material accounts for 20-60% of the total amount, the aggregate accounts for 60-20% of the total amount, and the water accounts for 20-26% of the total amount; The additive accounts for 6-8% of the mass of the cementing material; the cementing material is wet-process phosphoric acid byproduct phosphogypsum, and the dosage of quicklime in the aggregate is 3-5% of the mass of the dihydrate gypsum; the aggregate consists of phosphogypsum dihydrate and quicklime; The additive is prepared by mixing 32.5 cement, phosphogypsum, fly ash and limestone according to the mass ratio of 55-65:2.8-3.2:20-22:15-17 to form superfine active micro powder. The cementing material, the aggregate and the water account for 25-50% of the total weight, 50-25% of the aggregate and 20-25% of the total weight. The free water content of the semi-hydrated phosphogypsum is 20-25%, and the crystal water content is 6.5-8%. The amount of quicklime in the aggregate is 4% of the mass of the dihydrate gypsum. The addition amount of the additive is 7% of the mass of the cementing material, the mass ratio of the 32.5 cement, phosphogypsum, fly ash and limestone in the additive is 60:3:21:16, and the particle size of the additive is less than