Method for preparing polyaluminum ferric chloride by using iron-containing acid pickle and aluminum ash

A technology of polyaluminum ferric chloride and waste acid liquid, which is applied in the fields of ferric halide, flocculation/sedimentation water/sewage treatment, etc., can solve problems that have not been seen before, and achieve the effect of convenient operation, easy operation and short process steps

Active Publication Date: 2014-12-24
CHANGSHU CITY FOR THE YU ENVIRONMENT TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Method for preparing polyaluminum ferric chloride by using iron-containing acid pickle and aluminum ash

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Experimental program
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Effect test

Embodiment 1

[0032] A) equipped with a reaction device, the specific structure of the reaction device, please refer to figure 1 , in the figure 1 Provided is a reaction vessel 1 supported on the ground or built on the basis of the ground in the state of use. A reaction vessel 1 is provided on the reaction vessel top cover 11 of the reaction vessel 1 for introducing iron-containing waste acid into The iron-containing waste acid liquid in the reaction vessel 1 is introduced into an interface 111 and an exhaust gas interface 112 for drawing out the exhaust gas in the reaction vessel 1, and a reaction vessel 1 is provided on the lower side of the reaction vessel 1. The reactant lead-out interface 12 of object drawing; Provide a stirring mechanism 2, this stirring mechanism 2 is arranged on the described reaction vessel top cover 11, and is positioned at the central position of reaction vessel top cover 11, and this stirring mechanism 2 also stretches to In the reaction vessel 1; a working pla...

Embodiment 2

[0043] Only change the mass percent concentration of the dilute hydrochloric acid in step B) to 37%, change the iron-containing waste acid solution to a mass percent concentration of 10% and produce iron-containing waste acid solution by electroplating, and replace the iron-containing waste acid solution The mass percent concentration of the concentration is increased to 18%, that is, the mass percent concentration of the obtained iron-containing waste acid stock solution is 18%; the stirring speed of the stirring shaft 23 of the stirring mechanism 2 in step C) is changed to 150rpm, and the first time In the feeding process, the reaction time of aluminum ash and iron-containing waste acid stock solution was changed to 170min. In the second feeding process, the reaction time of aluminum ash and iron-containing waste acid stock solution was changed to 140min. In the third feeding process, aluminum ash The reaction time with the iron-containing waste acid stock solution was change...

Embodiment 3

[0045] Only change the mass percentage concentration of dilute hydrochloric acid in step B) to 36%, and use the iron-containing waste acid solution with a mass percentage concentration of 12% instead of the iron-containing waste acid produced by the steel plate manufacturer for cleaning the steel plate, that is, pickling liquid, the mass percent concentration of the iron-containing waste acid solution is increased to 16.5%, that is, the mass percent concentration is 16.5% of the iron-containing waste acid stock solution; the stirring speed of the stirring shaft 23 of the stirring mechanism 2 in the step C) is changed to Change the reaction time of aluminum ash and iron-containing waste acid stock solution to 190min in the first feeding process, and change the reaction time of aluminum ash and iron-containing waste acid stock solution to 100min in the second feeding process. In the third feeding process, the reaction time of aluminum ash and iron-containing waste acid stock solu...

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Abstract

The invention discloses a method for preparing polyaluminum ferric chloride by using iron-containing acid pickle and aluminum ash and belongs to the technical field of preparation of inorganic polymer coagulants. The method comprises the following steps: preparing a reaction device, wherein the reaction device comprises a reaction container, a stirring mechanism, a working platform, an aluminum ash spiral conveying mechanism, a settling pond and a settling pond stirring mechanism; an iron-containing acid pickle introduction joint and a waste gas outlet joint are formed in a top cover, and a reactant outlet joint is formed in the lower side part of the reaction container; the stirring mechanism is arranged on the top cover of the reaction container and extends into the reaction container; the working platform is connected with the upper side part of the reaction container; the aluminum ash spiral conveying mechanism is arranged on the working platform and is communicated with the reaction container; a supporting crossbeam is arranged on the upper part of the settling pond; the settling pond stirring mechanism is arranged at a central position of the supporting crossbeam and stretches into the settling pond; equipping a discharge valve on the reactant outlet joint; preparing an iron-containing waste acid stock solution; preparing a crude product of polyaluminum ferric chloride; and settling. The resources are saved, and the environmental protection is promoted; the requirement on large-scale industrialized production is met; and the method is good in energy-saving effect, simple in structure and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic macromolecule coagulants, and in particular relates to a method for preparing polyaluminum ferric chloride from iron-containing waste acid solution and aluminum ash. Background technique [0002] The reason why polyaluminum ferric chloride is widely used in the treatment of drinking water, industrial water, domestic wastewater and industrial sewage is because it has advantages not limited to the ten aspects summarized below: First, the dosage is lower than traditional Coagulants such as polyferric sulfate and polyaluminum chloride; the second is to combine the characteristics of inorganic polymer polyaluminum chloride and polyferric chloride; the third is to form flocs and precipitate quickly, and the processing capacity Strong; Fourth, the consumption of alkalinity in water is small, and the pH value of the effluent drops less; Fifth, the insoluble matter in the aqueous solution is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10C02F1/52
Inventor 朱雪峰徐晓锋刘遗松夏平
Owner CHANGSHU CITY FOR THE YU ENVIRONMENT TECH
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