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Method for preparing engineering soil from alkaline residues by ammonia-alkaline method

A technology of engineering soil and ammonia-alkali method, which is applied in the field of alkali slag treatment, can solve the problems of thick paste mud that is not suitable for separation and treatment costs, high sensitivity, unstable alkali slag components, etc., to improve strength and water stability, reduce Soluble salt content, effect of reducing soluble salt

Pending Publication Date: 2020-09-01
ROAD ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many domestic scholars have carried out scientific research on the comprehensive utilization of alkali slag, and achieved some application results, such as the development of soil improvers, flue gas desulfurizers, cement mixtures, road filling soil, etc., using alkali slag as raw materials. There are many factors such as unstable slag composition, difficulty in reducing chlorides, viscous paste that is not suitable for separation, and high processing costs.
[0003] Alkali slag is dehydrated to form a solid alkali slag with a low moisture content. Although it has a certain strength, it has high sensitivity and its strength decreases significantly after the surface is exposed to water, so it is not suitable to be used as engineering filler directly.

Method used

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  • Method for preparing engineering soil from alkaline residues by ammonia-alkaline method
  • Method for preparing engineering soil from alkaline residues by ammonia-alkaline method
  • Method for preparing engineering soil from alkaline residues by ammonia-alkaline method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Use dredgers or hydraulic excavation units to excavate the alkali slag in the yard, and then use the pressure pipeline to transport the alkali slag slurry to the sedimentation tank, and then carry out sediment treatment, concentration treatment, homogenization and modification on the alkali slag, Adjust the mass fraction of alkali slag in the alkali slag slurry to 10-20% in the pool, and then use a plate and frame filter press for dehydration and consolidation. The feeding time of the plate and frame filter press is 30-40 minutes, and the pressing time is 5-8 minutes , and then stacked for 3 to 5 days to obtain engineering soil, and record the parameters in the process of alkali slag treatment, as shown in Table 1;

[0021] Wherein, the specific steps of homogenization modification are: adding calcareous material and pozzolanic active material to the alkali slag after concentrated treatment, stirring evenly, The mass ratio is 5:16:100. Calcareous materials are recorded ...

Embodiment 2

[0025] Use dredgers or hydraulic excavation units to excavate the alkali slag in the yard, and then use the pressure pipeline to transport the alkali slag slurry to the sedimentation tank, and then carry out sediment treatment, concentration treatment, homogenization and modification on the alkali slag, Adjust the mass fraction of alkali slag in the alkali slag slurry to 10-20% in the pool, and then use a plate and frame filter press for dehydration and consolidation. The feeding time of the plate and frame filter press is 30-40 minutes, and the pressing time is 5-8 minutes , and then stacked for 3 to 5 days to obtain engineering soil;

[0026] Wherein, the specific steps of homogenization modification are: adding calcareous material and pozzolanic active material to the alkali slag after concentrated treatment, stirring evenly, The mass ratio is 0:20:100.

Embodiment 3

[0028] Use dredgers or hydraulic excavation units to excavate the alkali slag in the yard, and then use the pressure pipeline to transport the alkali slag slurry to the sedimentation tank, and then carry out sediment treatment, concentration treatment, homogenization and modification on the alkali slag, Adjust the mass fraction of alkali slag in the alkali slag slurry to 10-20% in the pool, and then use a plate and frame filter press for dehydration and consolidation. The feeding time of the plate and frame filter press is 30-40 minutes, and the pressing time is 5-8 minutes , and then stacked for 3 to 5 days to obtain engineering soil;

[0029] Wherein, the specific steps of homogenization modification are: adding calcareous material and pozzolanic active material to the alkali slag after concentrated treatment, stirring evenly, The mass ratio is 15:5:100.

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Abstract

The invention discloses a method for preparing engineering soil from alkaline residues by an ammonia-alkaline process. The method comprises the step of: sequentially carrying out sediment treatment, concentration treatment, homogenization modification, dehydration treatment and stacking treatment on alkaline residues to obtain engineering soil, wherein the homogenizing modification comprises the following specific steps: adding a calcium material and a volcanic ash active material into the concentrated alkaline residues, and uniformly stirring the mixture; and the mass ratio of dry substancesin the calcium material, the volcanic ash active material and the concentrated alkaline residues is (0-15): (5-20): 100. The method has the advantage of improving the strength and water stability of the engineering soil prepared from the alkaline residues.

Description

technical field [0001] The invention relates to the field of alkali slag treatment. More specifically, the present invention relates to a method for preparing engineering soil by utilizing the alkali slag of the ammonia-soda method. Background technique [0002] Ammonia-soda plant alkali slag is a kind of solid waste with large pores and fine particles, the particle size is usually 2-5 μm, and the aggregate diameter is 15-25 μm. Alkali slag mainly includes CaCO 3 , CaCl 2 , CaO, Mg(OH) 2 , SiO 2 , CaSO 4 , NaCl, Al 2 o 3 、H 2 Substances such as O, which are similar to the main components of the soil skeleton, have the basic conditions to be used as engineering soil, and are used for the filling of sites, foundations, roadbeds, etc. Many domestic scholars have carried out scientific research on the comprehensive utilization of alkali slag, and achieved some application results, such as the development of soil improvers, flue gas desulfurizers, cement mixtures, road f...

Claims

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Application Information

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IPC IPC(8): C04B28/10
CPCC04B28/10C04B2111/00775C04B2201/20C04B2201/50C04B18/0481C04B18/142C04B18/08C04B18/12C04B14/10C04B18/04C04B14/108C04B18/141C04B7/12C04B14/14C04B14/047C04B14/04C04B14/08
Inventor 周欢季光明胡芳邹迪程润喜薛艳丽
Owner ROAD ENVIRONMENT TECH
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