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Method for forming solidified filler by filling phosphorous gypsum in downhole goaf

A technology of phosphogypsum and gobs, which is applied in the direction of filling, mining equipment, earth drilling and mining, etc., can solve the problems of heavy burden on phosphate fertilizer enterprises, occupation of phosphogypsum, and environmental pollution, so as to reduce the loss rate of mining dilution and prevent Settlement, the effect of improving the ore recovery rate

Active Publication Date: 2009-04-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the discharge of phosphogypsum not only occupies a large amount of cultivated land and pollutes the environment, but also causes a great burden on phosphate fertilizer enterprises

Method used

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  • Method for forming solidified filler by filling phosphorous gypsum in downhole goaf

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: A large amount of phosphogypsum waste is produced in the production of phosphoric acid by a phosphate rock, and a filling system is built with the process flow shown in Figure 1. Use 10 tons of cement, 10 tons of fly ash, 70 tons of phosphogypsum, and 2.1 tons of sodium sulfate additives to fill in the No. 5 underground stope, and the mass concentration of the filling slurry is 60%. After the filling slurry is filled into the stope, it solidifies to form a filling body. 10 samples are taken on site and the strength of the filling body is tested. The average strength of the filling body for 28 days is 1.08MPa, which can meet the mining technical requirements.

Embodiment 2

[0017] Example 2: The ore deposit of a certain phosphate rock is located under the road. In order to realize the safe mining of ore under the road, a filling system was built with the technological process shown in Figure 1. Fill No. 1 stope with 15 tons of cement, 15 tons of fly ash, 90 tons of phosphogypsum, and 2.5 tons of sodium sulfate additive, and the mass concentration of the filling slurry is 58%. Five samples were taken on site, and the average strength of the phosphogypsum solidified body in the test stope reached 1.28MPa in 28 days. According to research and analysis, the use of this strength phosphogypsum consolidation body to fill the goaf will not cause underground mining to damage the road.

Embodiment 3

[0018] Example 3: A certain phosphate rock resource is of high grade. It was originally mined by the caving method. The ore dilution rate reached 38%, and the mining loss rate reached 42%. In order to reduce the loss rate of dilution, a filling system is built with the technological process shown in Figure 1. Fill the test stope with 5 tons of cement, 5 tons of fly ash, 40 tons of phosphogypsum and 0.8 tons of sodium sulfate additive, and the mass concentration of the filling slurry is 58%. Five samples were taken from the filling stope, and the average strength of the phosphogypsum solidified body reached 0.81MPa after 28 days of testing. The ore is mined by the phosphogypsum consolidation filling process, the mining dilution rate is reduced to 8%, and the ore loss rate is reduced to 5%.

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Abstract

The method of forming solidified filler through filling ardealite in downhole goaf includes mixing cement, flyash and ardealite in the ratio of 1 to 1to 6-8; adding sodium sulfate as additive in the amount of 1.3-2.5 wt% of the foregoing three materials, mixing with water to form slurry of 57-63 wt% concentration, filling the slurry to the downhole goaf, and solidifying to form the high strength filler. The present invention can raise ore recovering rate, reduce ore loss, lower mining cost, avoid surface deposition, and utilize ardealite effectively.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of mining waste, and in particular relates to a method for filling phosphogypsum in an underground goaf to form a solidified filling body. Background technique [0002] Phosphogypsum is a by-product produced when chemical plants react with apatite and sulfuric acid to produce phosphoric acid by wet method. For every ton of phosphoric acid produced, 5 tons of phosphogypsum will be produced. Among chemical gypsum, phosphogypsum has the largest emission. The annual output of phosphogypsum in my country is about 20 million tons, ranking third in the world. At present, the world's annual emissions amount to 110-130 million tons, but only 4.6-4.7 million tons are used, and the utilization rate is very low. CaSO in phosphogypsum 4 2H 2 The O content is generally as high as 90% or more, but it usually also contains P 2 o 5 : 0.3% to 1.5%, F: 0.1% to 1.5%, and other harmful impurities that en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F15/00
Inventor 李夕兵杜绍伦王新民姚金蕊赵国彦刘志祥周子龙
Owner CENT SOUTH UNIV
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