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Method for treating alkaline residue through combination of chemical conditioning and vacuum preloading

A technology for chemical conditioning and alkali slag, applied in chemical instruments and methods, sludge treatment, improvement of process efficiency, etc., can solve the problem of reducing the vacuum preloading consolidation rate, bending the vertical drainage plate, and difficult to meet the dehydration of alkali slag. The need for reinforcement, etc.

Active Publication Date: 2021-07-06
BEIJING RONGCHUANG GEOTECHNICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of high moisture content, small particles and strong fluidity of alkali slag, it is easy to cause problems such as bending and silting of the vertical drainage board during vacuum preloading, which reduces the dehydration efficiency of alkali slag and is difficult to meet the requirements of dehydration and reinforcement of alkali slag. needs
The colloidal nature of alkali slag will also reduce the consolidation rate of vacuum preloading and hinder the dehydration process of alkali slag

Method used

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  • Method for treating alkaline residue through combination of chemical conditioning and vacuum preloading
  • Method for treating alkaline residue through combination of chemical conditioning and vacuum preloading

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for chemical conditioning combined with vacuum preloading to treat alkali slag, the steps are as follows:

[0031] (1) Detect the pH of the alkali slag in the alkali slag pool to be 11.3, the moisture content is 72%, and the ammonia nitrogen value is 85mg / L;

[0032] (2) Add the coagulant, flocculant and acid reagent chemical conditioner to the feeding preparation bin 4 to prepare a solution according to a certain amount, wherein the coagulant is polyaluminum sulfate, and the flocculant is a mass ratio of 1:3 Polyacrylamide and hydroxymethylcellulose, the acid reagent is citric acid;

[0033] (3) After the prepared chemical conditioner is evenly stirred, it is sent to the alkali slag pool through the pipeline pump in turn, and the gas injection device 3 is opened, and the injected gas is continuously and fully gas-explosively stirred and bubbling, so that the chemical conditioner is added to the alkali slag In the process, the amount of coagulant, flocculant a...

Embodiment 2

[0037] (1) Detecting the pH of the alkali slag in the alkali slag pool is 10.9, the water content is 87%, and the ammonia nitrogen value is 65mg / L;

[0038] (2) Coagulants, flocculants and acid reagent chemical conditioners are added to the feeding preparation bin 4 according to a certain amount to prepare a solution, wherein the coagulant is polyaluminum sulfate, and the flocculants are phosphoric acid type amphoteric starch, acid Reagent is the hydrochloric acid of 30% mass concentration;

[0039] (3) After the prepared chemical conditioner is evenly stirred, it is sent to the alkali slag pool through the pipeline pump in turn, and the gas injection device 3 is opened, and the injected gas is continuously and fully gas-explosively stirred and bubbling, so that the chemical conditioner is added to the alkali slag In the process, until it can be fully mixed with the alkali slag, the amount of coagulant, flocculant and acid reagent added is 5%, 0.3% and 5% of the mass of the al...

Embodiment 3

[0043] (1) Detecting the pH of the alkali slag in the alkali slag pond is 12.2, and the moisture content is 81%, and the ammonia nitrogen value is 105mg / L;

[0044] (2) Add the coagulant, flocculant and acid reagent chemical conditioner to the feeding preparation bin 4 according to a certain amount to prepare a solution, wherein the coagulant is polyaluminum chloride and polyaluminum sulfate at a ratio of 1:1, flocculation The reagent is polyacrylamide, and the acid reagent is sulfuric acid of 98% mass concentration;

[0045] (3) After the prepared chemical conditioner is evenly stirred, it is sent to the alkali slag pool through the pipeline pump in turn, and the gas injection device 3 is opened, and the injected gas is continuously and fully gas-explosively stirred and bubbling, so that the chemical conditioner is added to the alkali slag In the process, until it can be fully mixed with the alkali slag, the amount of coagulant, flocculant and acid reagent added is 3%, 0.3% a...

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Abstract

The invention discloses a method for treating an alkaline residue pool through combination of chemical conditioning and vacuum preloading. The method comprises two working procedures of chemical conditioning and vacuum preloading. Firstly, the properties of the alkaline residue are changed through a chemical conditioner, so that the alkaline residues meet related environmental protection indexes and reach the I-class general industrial solid waste standard, and storage and resource utilization are facilitated; and the colloidal property of the alkaline residue is destroyed through a chemical conditioner, fine alkaline residue particles are promoted to be gathered, the drainage efficiency of later vacuum preloading can be effectively improved, the moisture content of the alkaline residues can be rapidly reduced in a large scale, and the alkaline residues can meet the requirement for resource utilization. According to the method, chemical conditioning is combined with vacuum preloading, so that the dosage of a large batch of chemical conditioning agents can be saved, the treatment cost is reduced, meanwhile, the alkali residues can be quickly treated in a large scale, and subsequent resource utilization is facilitated.

Description

technical field [0001] The invention relates to the technical field of industrial solid waste treatment, in particular to a method for treating alkali slag through chemical conditioning combined with vacuum pre-pressing, and in particular to the treatment of alkali slag by ammonia-soda method. Background technique [0002] Soda ash is one of the most important raw materials of basic chemical industry, and its output and consumption are important indicators to measure the level of national industrial development. The production of soda ash in my country is mainly based on the ammonia-soda method. In order to decompose NH 4 Cl, so that ammonia can be recycled, adding lime milk to the system to distill ammonia, but a large amount of waste residue and waste liquid will be generated in the production process, and white paste-like alkali residue will be produced after the waste liquid naturally settles. The paste-like alkali residue is mainly Contains CaCO 3 , CaSO 4 , Mg(OH) ...

Claims

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Application Information

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IPC IPC(8): A62D3/30A62D3/36B09B3/00C02F11/148C02F11/122C02F11/00
CPCA62D3/30A62D3/36B09B3/00C02F11/148C02F11/122C02F11/00Y02P10/20
Inventor 张亮付春阳胡黎明戴斌朱允伟刘宏运
Owner BEIJING RONGCHUANG GEOTECHNICAL ENG CO LTD
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