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Acid soaking type solid-liquid-state polysilicic acid metal salt coagulant and preparation method thereof

A polysilicate metal salt and coagulant technology, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., can solve the problem that products cannot compete with existing products in the market, cost High, only in the laboratory and other problems, to achieve the effect of maintaining stability, preventing polymerization failure, and speeding up the preparation process

Active Publication Date: 2018-11-23
广州安达净水材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Garbage incineration is prone to secondary pollution, and incineration fly ash is the main carrier of secondary pollution. Incineration fly ash is generally considered a hazardous waste because it contains heavy metals with high leaching toxicity and dioxins with high toxic equivalents; At present, waste incineration fly ash is mainly disposed of in sealed landfill, landfill after cement solidification, melting and solidification landfill, and landfill after chemical stabilization, while resource recovery mainly focuses on the recovery of soluble salts by washing with water. However, these methods are only in the laboratory stage. The biggest problem in realizing their industrialization is that the cost is too high, and the obtained products cannot compete with existing products in the market.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment one, pickling first, then prepare solid coagulant:

[0040] A kind of preparation method of pickling type solid polysilicate metal salt coagulant, described preparation method mainly comprises:

[0041] 1) Wash and mix the fly ash and water according to the mass ratio of 1:10, and the leaching time is 23.5-48.2 h until a light yellow-green solution is obtained;

[0042] 2) Preparation of leaching solution: use 1+1 sulfuric acid and nitric acid to prepare a mixed acid, or use sulfuric acid and hydrochloric acid sulfuric acid-hydrochloric acid mixed acid, and then prepare the mixed acid and water to make a 1+1 acid solution as a leaching solution; then The fly ash leached in step 1) is leached through the leaching solution for 48-96 hours, and finally filtered and air-dried to obtain the solid residue A and the liquid filtrate B;

[0043] 3) The reaction vessel is selected as a 100 kg glass reactor, which has four openings, respectively placing a thermometer, ...

Embodiment 2

[0050] Embodiment two, pickling first, then prepare liquid coagulant:

[0051] A kind of preparation method of pickling type liquid polysilicate metal salt coagulant, it is characterized in that, described preparation method mainly comprises:

[0052] 1) Wash and mix the fly ash and water according to the mass ratio of 1:10~12, and the leaching time is 23.5~48.2 h until a light yellow-green solution is obtained;

[0053] 2) Preparation of leaching solution: use 1+1 sulfuric acid and nitric acid to prepare a mixed acid, or use sulfuric acid and hydrochloric acid sulfuric acid-hydrochloric acid mixed acid, and then prepare the mixed acid and water to make a 1+1 acid solution as a leaching solution; then The fly ash leached in step 1) is leached through the leaching solution for 48-96 hours, and finally filtered and air-dried to obtain the solid residue A and the liquid filtrate B;

[0054] 3) The reaction vessel is selected as a 100 kg glass reactor, and four ports are opened, ...

Embodiment 3

[0059] Embodiment three, pickling first, then prepare liquid coagulant:

[0060] A kind of preparation method of pickling type liquid polysilicate metal salt coagulant, it is characterized in that, described preparation method mainly comprises:

[0061] 1) Wash and mix the fly ash and water according to the mass ratio of 1:10, and the leaching time is 23.5-48.2 h until a light yellow-green solution is obtained;

[0062] 2) Preparation of leaching solution: use 1+1 sulfuric acid and nitric acid to prepare a mixed acid, or use sulfuric acid and hydrochloric acid sulfuric acid-hydrochloric acid mixed acid, and then prepare the mixed acid and water to make a 1+1 acid solution as a leaching solution; then The fly ash leached in step 1) is leached through the leaching solution for 48-96 hours, and finally filtered and air-dried to obtain the solid residue A and the liquid filtrate B;

[0063] 3) The reaction vessel is selected as a 100 kg glass reactor, and four ports are opened, a...

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Abstract

The invention relates to a metal salt coagulant, in particular to an acid soaking type solid-liquid-state polysilicic acid metal salt coagulant and a preparation method thereof. The coagulant is mainly prepared from the following ingredients including 21 to 95 parts of fly ash, 10 to 200 parts of water, 8 to 60 parts of sulphuric acid, 7 to 52 parts of nitric acid, 10 to 63 parts of water glass, 7to 54 parts of aluminum chloride, 8 to 63 parts of aluminum chloride hexahydrate, 2 to 30 parts of aluminum sulphate or 5 to 71 parts of sodium silicate nanahydrate. The method of firstly performingacid soaking and then preparing the solid-state or liquid-state products is used for synthesizing the polysilicic acid metal salt coagulant. Compared with the direct preparation of the coagulant, thepreparation method has the advantages that the preparation process is accelerated; the preparation procedure is simplified; the stability is maintained. The coagulant is used for landfill leachate coagulation treatment agents and incineration sludge coagulation treatment agents; after the acid soaking, the fly ash can be reasonably utilized; in addition, the waste water is treated through the solid-state or liquid-state coagulant; meanwhile, the resource circulation utilization can be realized; the polysilicic acid metal salt coagulant can be prepared from fly ash.

Description

technical field [0001] The invention relates to a metal salt coagulant, in particular to an acid-soaked solid-liquid polysilicate metal salt coagulant and a preparation method thereof. Background technique [0002] Garbage incineration is prone to secondary pollution, and incineration fly ash is the main carrier of secondary pollution. Incineration fly ash is generally considered a hazardous waste because it contains heavy metals with high leaching toxicity and dioxins with high toxic equivalents; At present, waste incineration fly ash is mainly disposed of in sealed landfill, landfill after cement solidification, melting and solidification landfill, and landfill after chemical stabilization, while resource recovery mainly focuses on the recovery of soluble salts by washing with water. However, these methods are only in the laboratory stage. The biggest problem in realizing their industrialization is that the cost is too high, and the obtained products cannot compete with ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/5236C02F1/5245
Inventor 石宗武郑士亚
Owner 广州安达净水材料有限公司