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A phosphorus-based salt mine goaf filling material prepared by using phosphogypsum to solidify salt waste

A technology for filling materials and salt wastes, applied in the field of filling materials, can solve the problems of difficult disposal of wastes, environmental pollution, hidden dangers of ground disasters, etc., and achieve the effects of prolonged condensation time, low preparation cost, and high recycling rate

Inactive Publication Date: 2018-11-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increasingly serious environmental protection pressure and safety hazards in this industry have become the bottleneck restricting the development of the salt chemical industry in our province, and it is a sharp sword hanging over the heads of many salt chemical enterprises, threatening their survival.
At present, there are three main problems in the salt chemical industry: (1) The instability of the salt cavity causes geological disasters. So far, more than 90 million tons of raw salt have been mined in the Yunying Salt Mine, and the underground salt cavity formed exceeds 23 million cubic meters. The rock salt cavern in operation exceeds 10 million cubic meters, and there is a huge potential disaster
(2) Wastes are difficult to dispose of. Soda slag produced by soda ash manufacturing, salt mud produced by caustic soda enterprises, and other wastes are mainly stored on the ground, which occupies land and seriously pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: A salt mine goaf filling material prepared by using phosphogypsum to solidify salt waste, its components and parts by weight include:

[0017] 15 parts of phosphogypsum, 40 parts of alkali slag, and 45 parts of salt mud.

[0018] Take the above raw materials, mix and stir according to the water-to-material ratio of 0.58, the obtained salt mine goaf filling material has a waste rate greater than 95%, compressive strength 1.8MPa, flexural strength 0.7MPa, viscosity 65s, initial setting time 57min, final setting time 68min, bond strength 0.43MPa, expansion rate greater than 0.055%. (wherein the viscosity is measured by a funnel-type mud viscometer, and the unit is s).

Embodiment 2

[0019] Embodiment 2: A salt mine goaf filling material prepared by using phosphogypsum to solidify salt waste, its components and parts by weight include:

[0020] 15 parts of phosphogypsum, 85 parts of alkali slag, 0.15 part of citric acid, and 0.3 part of melamine plasticizer.

[0021] Take the above raw materials, mix and stir according to the water-to-material ratio of 0.38, and the obtained salt mine goaf filling material has a waste rate of more than 95%, a compressive strength of 2.5MPa, a flexural strength of 0.9MPa, a viscosity of 35s, and an initial setting time of 62min, final setting time 75min, bond strength 0.43MPa, expansion rate greater than 0.065%. (wherein the viscosity is measured by a funnel-type mud viscometer, and the unit is s).

Embodiment 3

[0022] Embodiment 3: A salt mine goaf filling material prepared by using phosphogypsum to solidify salt waste, its components and parts by weight include:

[0023] 15 parts of phosphogypsum, 85 parts of salt mud, 0.05 parts of sodium citrate, 0.1 part of citric acid, and 0.3 parts of melamine plasticizer.

[0024] Take the above raw materials, mix and stir according to the ratio of water to material 0.38, the obtained salt mine goaf filling material has a waste rate greater than 95%, compressive strength 2.6MPa, flexural strength 0.8MPa, viscosity 54s, initial setting time 82min, final setting time 93min, bond strength 0.9MPa, expansion rate 0.059%. (The viscosity is measured by a funnel-type mud viscometer, and the unit is s)

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Abstract

The invention belongs to the technical field of fillers, and particularly relates to a phosphorus-based salt mine goaf filler prepared from ardealite solidification salt waste. The phosphorus-based salt mine goaf filler is prepared from the following components in parts by weight: 10-30 parts of ardealite, 70-85 parts of salt waste, 0-0.2 part of a retarder, and 0-0.4 part of a plasticizer. The phosphorus-based salt mine goaf filler disclosed by the invention has the benefits that the waste utilization rate is high, and phosphatizing waste and salinizing waste are used as main raw materials, so that the preparation cost is low; the coagulation time can be adjusted, and the retarder is used for adjusting the coagulation time of the filler, so that enough filling time can be obtained; the stickiness is adjustable, and the plasticizer is used for improving the stickiness of the filler, so that the requirement of a filling technology is met.

Description

technical field [0001] The invention belongs to the technical field of filling materials, in particular to a phosphorus-based salt mine goaf filling material prepared by using phosphogypsum to solidify salt waste. Background technique [0002] Phosphogypsum is the most important industrial by-product in the production of phosphorus chemical industry in my country. Every ton of P produced 2 o 5 It is necessary to discharge 4.5 to 5.5 tons of phosphogypsum. Because phosphogypsum contains harmful impurities such as phosphorus, fluorine, and organic matter, there is currently no effective pretreatment technology to completely eliminate the impact of impurities, resulting in low added value of related products prepared from phosphogypsum, and the enthusiasm of enterprises to use phosphogypsum is not high. , mainly by open-air storage. According to statistics, the cumulative stockpiles of phosphogypsum in my country have exceeded 300 million tons. The stockpiling of phosphogyp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B18/04
CPCY02W30/91
Inventor 马保国金子豪孟倩玥苏英贺行洋李显良祝路卢文达
Owner WUHAN UNIV OF TECH
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