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A method for improving the strength of industrial waste alkali slag slurry after settling

A technology of industrial waste caustic soda and slurry, which is applied in the field of mining solution cavity backfilling, can solve the problems of affecting land use and creating economic value, low compressive strength, etc., and achieves the effects of being conducive to environmental protection, improving use intensity, and protecting land resources

Inactive Publication Date: 2015-09-16
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong ability of industrial alkali slag to absorb and retain water, it takes four to five years or even longer to dry naturally, and the large salt mine dissolution chamber is filled with a large amount of brine, so the alkali slag slurry is backfilled into the chamber , it will be difficult to settle when suspended in brine because of its small particle size and light weight, and its Brownian motion is greater than gravity settlement, and the compressive strength after filling the cavity is also very low, which affects the use of land and the creation of economic value

Method used

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  • A method for improving the strength of industrial waste alkali slag slurry after settling
  • A method for improving the strength of industrial waste alkali slag slurry after settling
  • A method for improving the strength of industrial waste alkali slag slurry after settling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0023] The method for improving the strength of industrial waste caustic slag slurry after settlement, the steps are as follows:

[0024] Weigh 300g of alkali slag and place it in a plastic bottle. The composition of the alkali slag is 58.82% of calcium carbonate, 39.01% of calcium sulfate dihydrate, 1.59% of sodium chloride, and 0.58% of silicon dioxide. In terms of mass percentage, 200mL of brine was added, and the The above-mentioned brine is prepared with 30g coarse salt / 100mL (coarse salt is NaCl with a purity of 99%, in terms of mass percentage) concentration standard of distilled water, and it is stirred into an alkali slag slurry, and 10-50g of calcium-based montmorillonite, 20g waste phosphorus slag, 20g of desulfurized gypsum without water, and the composition of the waste phosphorus slag is CaO47~52%, SiO 2 40-43%, P 2 o 5 0.8~2.5%, Al 2 o 3 2~5%, Fe 2 o 3 0.8~3.0% and F2.5~3%, stir evenly for later use. Then, dissolve 1.5g polyacrylamide modified by sulfonat...

Embodiment 6～10

[0029] Weigh 300g of alkali slag and place it in a plastic bottle, add 200mL of brine, stir it to form an alkali slag slurry, add 30g of montmorillonite, 10-50g of waste phosphorus slag, and 20g of desulfurized gypsum in sequence, and stir evenly for later use. Then, dissolve 1.5g of polymer flocculant with 200mL of brine, pour the polymer flocculant solution into a plastic bottle, and let it stand for 10 to 15 days. The dynamometer measures the compressive torsion and shear torsion of the sediment in the lower layer. All the other are with embodiment 1.

[0030] The test method of its shear torsion is the same as that of Examples 1-5.

[0031] The formula and test results are shown in Table 2.

Embodiment 11～15

[0033] Weigh 300g of alkali slag and place it in a plastic bottle, add 200mL of brine, stir it to form an alkali slag slurry, add 30g of montmorillonite, 40g of waste phosphorus slag, and 50g of desulfurized gypsum in sequence, and stir evenly for later use. Then, dissolve 0.05-4g polymer flocculant with 200mL brine, pour the polymer flocculant solution into a plastic bottle, and let it stand for 10 to 15 days. The spring force measuring device measures the compressive torsion and shear torsion of the sediment in the lower layer.

[0034] The test method of its shear torsion is the same as that of Examples 1-5.

[0035] Formulation and test results are shown in Table 3

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Abstract

The invention relates to a method for improving strength of industrial waste alkali residue slurry after settlement. The method comprises the following steps of weighing 300g of alkali residues, putting the alkali residues into a container, adding 200mL of brine into the alkali residues, carrying put stirring to obtain alkali residue slurry, orderly adding 10 to 50g of montmorillonite, 10 to 50g of waste phosphorus slag and 20 to 100g of flue gas desulfurization gypsum into the alkali residue slurry, carrying put uniform stirring for next use, dissolving 0.05 to 4g of a polymeric flocculant by 200mL of brine, pouring the polymeric flocculant solution into the container, carrying out standing for 10 to 15 days, and after the slurry is clarified, determining an anti-compression torsion and a shearing torsion of precipitates in a lower layer of the slurry respectively by a compressor and a vane shearing device spring dynamometer. The method can improve industrial waste alkali residue use strength and provides a feasible method for mining cavity backfilling.

Description

technical field [0001] The invention relates to a method for increasing the strength of industrial waste alkali slag slurry after settlement, and belongs to the field of backfilling of mining dissolved cavities. technical background [0002] Soda slag mainly refers to the waste liquid and waste slag discharged from the ammonia-soda plant, and its main components are a large amount of calcium salt, magnesium salt, sodium salt, iron oxide and acid insoluble matter. At present, most of the ammonia-soda factories in the world use the method of discharging liquid and solid residue separately for the treatment of waste liquid and residue, and adopt methods such as building dams to block residue, reclamation of sea land, and building sedimentation tanks for solid residue; the waste liquid is clarified, After separation and treatment, it is discharged into rivers, lakes, seas and other waters. For example, the Rossillo plant in Italy was built on the seaside, using the method of mixi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14
Inventor 杨春和谢浩王涛徐玉龙
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI