Preparation method of enhanced aluminum calcium chloride crystal

Abstract

The invention provides a preparation method of an enhanced aluminum calcium chloride crystal, which mainly solves the problems of special raw material requirements, high possibility of radiation pollution and poor water purification effect in flocculant preparation in the prior art. The method comprises the steps of: 1) preparing a magnesium ion aqueous solution, an aluminum ion aqueous solution, a calcium ion aqueous solution, a hydroxide ion aqueous solution, a surfactant aqueous solution and a sodium carbonate suspension, 2) mixing, heating and stirring the aluminum ion aqueous solution, the calcium ion aqueous solution, the hydroxide ion aqueous solution and the surfactant aqueous solution to prepare a multiphase aluminum calcium chloride suspension, 3) controlling pH (potential of hydrogen) of a reaction solution, mixing, heating and stirring the magnesium ion aqueous solution, the sodium carbonate suspension and the multiphase aluminum calcium chloride suspension to prepare an enhanced multiphase aluminum calcium chloride suspension, performing room temperature standing on the suspension, obtaining a precipitate of the suspension, and drying the precipitate to form the enhanced aluminum calcium chloride crystal. The method is simple in technology, nontoxic, environmentally friendly and low in cost; and the prepared material contributes to improving purification quality of sewage and can be used for water purification treatment.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and particularly relates to calcium aluminum chloride crystals, which can be used for purification of sewage and sludge in environmental protection, as well as industrial waste water, drinking water, urban waste water, and waste water from breweries or other beverage industries. Purification treatment of waste water, or the removal of harmful substances before the discharge of waste water and sewage in the paper industry. Background technique [0002] "Water purification" treatment refers to the removal of harmful and other compounds that are not tolerated in water. [0003] "Water purification" is of great significance. Taking iron and steel enterprises as an example, blast furnace gas washing water is one of the main wastewater of iron and steel enterprises. It has the characteristics of large water volume, high water temperature, and high content of suspended solids. The water qual...

AI Technical Summary

Problems solved by technology

[0012] 1. The commonly used flocculant aluminum sulfate reacts with water to form flocs of aluminum hydroxide, but it may leave aluminum residues in the finished water, and aluminum may be toxic to humans at high concentrations

[0013] 2. Polyaluminum chloride is one of the most widely used flocculants at present. Although the flocculation effect is very good, its dehydration is not very good in the subsequent sludge treatment process due to the presence of aluminum hydroxide in the sludge.

[0014] 3. Ferric chloride is also used as another commonly used flocculant, which can function in a larger pH range than aluminum sulfate, but is not effective for many source waters, and this iron compound flocculation usually remains in the finished water. iron residues, which cause a slight odor to the water and possible brown stains on porcelain equipment; in addition, ferric chloride presents a risk of corrosion in water treatment systems

The weak point of this method is, 1) preparation raw material requires specificity, harshness, promptly must have lithium waste residue, fly ash, technical grade hydrochloric acid and industrial caustic soda raw material; process hazards

The disadvantages of this method are that 1) high-temperature roasting at 1400°C is required, and the preparation conditions are specific and harsh; 2) the hydrochloric acid used is a strong acid, which is very corrosive in itself, and calcium aluminate should be ground into powder and added Boiling in 30% hydrochloric acid for 5 hours increases the risk of the process

The weak point of this method is, 1) preparation raw material requires rare earth, and rare earth has potential radiation pollution hazard to human body and surrounding environment;

The disadvantage of this method is that this polyaluminum calcium chloride has little effect on changing the hardness of water quality and the treatment of acid-containing wastewater.

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