Chromium removal enhancer and preparation method thereof

A technology of reinforcing agent and reducing agent, applied in the field of removing harmful substances in cement, can solve the problems that the reducing agent is easily oxidized, loses the reducing effect, and the liquid chromium removing agent is not very effective in removing chromium, and achieves the promotion of hydration process, Improve physical properties and ensure the effect of restoring effects

Active Publication Date: 2014-06-04
SHANDONG HONGYI TECH
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Problems solved by technology

The chromium removal effect of this liquid chromium removal agent is not very significant, and the sec

Method used

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  • Chromium removal enhancer and preparation method thereof

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preparation example Construction

[0027] The embodiment of the present invention discloses a preparation method of a chromium removal enhancer, comprising the following steps:

[0028] a) Calcining kaolin, mixing the calcined kaolin with an acidic solution, then performing suction filtration, washing and drying the obtained solid;

[0029] b) mixing the kaolin obtained in step a) with the mixed solution to obtain a chromium removal enhancer; the mixed solution is a mixed solution of reducing agent, antioxidant, enhancer and water.

[0030] The application provides a chromium removal enhancer and a preparation method thereof. The chromium removal enhancer uses modified kaolin as a carrier and is used to remove hexavalent chromium in cement or concrete. Under the double action of adsorption and reduction, the enhancer provided by the invention can effectively remove hexavalent chromium in cement to reduce the harm to human body and environment, and meanwhile, the enhancer can also effectively improve the physica...

Embodiment 1

[0051] (1) Calcining kaolin at 850°C for 3 hours;

[0052] (2) Add calcined kaolin to 0.1mol / L sulfuric acid solution under stirring condition, stir at 80°C for 4 hours, filter with suction, wash, and dry for later use;

[0053] (3) Add 15wt% ferrous sulfate, 3wt% citric acid, and 25wt% sodium chloride into deionized water to prepare a 500mL mixture;

[0054] (4) Add 57wt% of the kaolin obtained in step 2) to the mixed liquid prepared in step 3), continuously stir for 2 hours, filter with suction, air dry naturally, and pulverize to obtain a chromium removal enhancer.

[0055] The determination of chromium content in cement was determined by diphenylcarbazide spectrophotometry. Detect the chromium removal efficiency of the chromium removal enhancer prepared in this embodiment, the chromium removal enhancer without adding the chromium removal enhancer and the chromium removal enhancer prepared in Comparative Example 1, as shown in Table 1, and table 1 is the chromium removal e...

Embodiment 2

[0057] (1) Calcining kaolin at 900°C for 4 hours;

[0058] (2) Add calcined kaolin to 0.15mol / L hydrochloric acid solution under stirring, stir at 80°C for 4 hours, filter with suction, wash, and dry for later use;

[0059] (3) Add 10wt% ferrous chloride, 1wt% ascorbic acid, and 20wt% calcium chloride into deionized water to prepare a 500mL mixture;

[0060] (4) Take 69wt% of the kaolin obtained in step 2) and add it to the mixed solution prepared in step 3), stir continuously for 2 hours, filter with suction, air dry naturally, and pulverize to obtain the chromium removal enhancer.

[0061] The determination of chromium content in cement was determined by diphenylcarbazide spectrophotometry. Detect the chromium removal efficiency of the chromium removal enhancer prepared in this embodiment, the chromium removal enhancer without adding the chromium removal enhancer and the chromium removal enhancer prepared in Comparative Example 1, as shown in Table 1, and table 1 is the chr...

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Abstract

The invention provides a method for preparing a chromium removal enhancer. The method comprises the following steps: (a) calcining kaolin, mixing the calcined kaolin and an acid solution, performing suction filtration, and washing and drying the obtained solid; (b) mixing the kaolin obtained in the step (a) and an mixed solution, and reacting to obtain the chromium removal enhancer, wherein the mixed solution is a mixed solution of a reducing agent, an antioxidant, an enhancer and water. According to the chromium removal enhancer prepared by the invention, the kaolin is taken as a raw material, the reducing agent, the antioxidant and the enhancer are mixed with the modified kaolin, and the chromium removal enhancer is obtained after the reaction. According to the chromium removal enhancer prepared by the invention, due to dual effects of adsorption and reduction, hexavalent chromium in cement is effectively removed, and physical properties of the cement are improved. The invention also provides the chromium removal enhancer prepared according to the method.

Description

technical field [0001] The invention relates to the technical field of removing harmful substances in cement, in particular to a chromium removal enhancer and a preparation method thereof. Background technique [0002] Chromium is a hard, silvery-white metal that mainly occurs in three forms: metallic chromium, trivalent chromium and hexavalent chromium. Chromium compounds are almost all toxic, of which hexavalent chromium is the most toxic. Hexavalent chromium is an ingestion or inhalation poison, which is mainly a chronic poison to the human body. It can invade the human body through the digestive tract, respiratory tract, skin and mucous membranes; and hexavalent chromium has a strong oxidizing effect, so chronic poisoning of hexavalent chromium is often It starts with local damage and gradually develops to incurable. [0003] Hexavalent chromium will be produced in cement raw materials and production processes, and hexavalent chromium in cement will also have serious a...

Claims

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Application Information

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IPC IPC(8): C04B7/38
Inventor 张秋艳曾凡军朱化雨朱孔赞冯恩娟徐明双赵建国赵洪义
Owner SHANDONG HONGYI TECH
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