KR19990001532A - Manufacturing method of inorganic polymer flocculant mainly composed of aluminum chloride - Google Patents

Abstract

0.2-1% of one or more iron salts of ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, polyiron chloride, and polyiron sulfate are added to aluminum chloride obtained by directly reacting metal aluminum with hydrochloric acid. By manufacturing basic aluminum chloride coagulant of iron coexistence system, PH area is extended to acidic side to broaden coagulation width and provide coagulant with excellent coagulant effect and wide adaptability to various water treatments, economic efficiency and work efficiency.

Description

[Name of invention]

Manufacturing method of inorganic polymer flocculant mainly composed of aluminum chloride

Detailed description of the invention

[Purpose of invention]

The present invention relates to a method for producing a flocculant containing polyaluminum chloride as a main component, and more specifically, to a polyaluminum chloride prepared from metal aluminum and hydrochloric acid, iron chloride having an agglomeration optimal condition is added as a main component. The present invention provides a method for preparing an inorganic polymer flocculant.

[Technical field to which the invention belongs and the prior art in that field]

Coagulant used in water, water and wastewater purification, especially inorganic polymer coagulant. Inorganic polymer coagulant which has been widely used in large quantities in the past, aluminum sulfate (Al ₂ (SO ₄ ) ₃ nH ₂ O) is inexpensive and toxic. Since it is possible to inject a large amount, but the appropriate coagulation range is narrower than other coagulants, and in general water treatment, it is inevitable to add alkali preparations and coagulants. In addition, ferrous chloride as an inorganic coagulant has a very wide agglomeration titration range, and does not dissolve the fulllock in the alkali region, the fulllock is heavy, and the sedimentation speed is high. It is difficult to select and it is extremely difficult to remove iron compounds for Humin.

In addition, aluminum chloride prepared by reacting aluminum hydroxide with hydrochloric acid was reacted for about 12 hours under a pressurized temperature of 150-180 ° C. and 3-5 kg / cm ² in a pressure-resistant container equipped with a double acid jacket for acid resistance. 10-18% and 45-60% basicity are obtained. The inner material of the pressure vessel with acid resistant double jacket during the manufacturing process is glass, and its life is greatly influenced by factors such as temperature and pressure reaction time and requires a large amount of energy source, which requires a heat supply device.

In addition, since the internal material of the device is glass, the loss will be great due to temporary thermal shock, so it is necessary to pay close attention to repair and maintenance, and it is difficult to expect more than 45% of the lower limit of base, which is one of the control items in quality control. Alkaline sources in the process should be supplied. Because of this, product stability and deterioration with time becomes a big problem. That is, there is a problem in decreasing the cohesive performance due to the generation of insoluble hydroxide during storage and deterioration with time of use.

[Technical problem to be achieved]

By producing aluminum chloride by directly reacting the discarded metal aluminum (can) with hydrochloric acid, the reaction time can be greatly shortened, and the strong acid salt of iron can be saved at the same time by saving energy by reacting only with the heat of its own reaction using a device that does not pressurize. By adding to the presence of coexisting salts, the optimum PH region is extended to the acidic side to expand the coagulation width, and to prepare a coagulant having excellent coagulant effect and wide adaptability, economic efficiency and work efficiency for various water treatments.

[Configuration and Function of Invention]

Currently, aluminum chloride used as flocculant such as aluminum sulfate and aluminum chloride used for water, water and wastewater refining, paper fixing agent for high purity, and antiperspirant for cosmetics is used as the main raw material of aluminum hydroxide in Japan and Australia. It is imported.

In this situation, the reduction of pollution factors by recycling aluminum cans that are discarded, waste hydrochloric acid, which is a pickling waste generated in the steel industry, and the reaction time in the manufacturing method of aluminum chloride manufactured from aluminum hydroxide can be achieved. It can shorten and save energy, moreover, reduce the cost of equipment, easy to maintain and maintain the device, and add fermentation of iron salt of strong acid. The method for preparing the aluminum chloride coagulant having the optimum condition will be described in detail. The aluminum can, which is discarded, that is, 108 parts by weight of metal aluminum and 630 parts by weight of hydrochloric acid having a concentration of 15% -35% is 100-110 in a reactor for acid resistance with a stirrer. The reaction is carried out for about 30 minutes-1 hour under atmospheric pressure while kept at At least one of ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, polyiron chloride, and polyiron sulfate is aged with respect to the total weight of the reactants by adding 0.2-1% It can be said to be a manufacturing method of the inorganic polymer flocculant which contains aluminum as a main component.

In the above reaction, the molar ratio of aluminum and chlorine is in the range of 0.5-2: 1, the most preferable molar ratio is 1.9-2: 1, and the general formula of the reactant is [Al ₂ (OH) nCl _6- n] m, where n is 1 -6, m is the degree of polymerization and n is a positive integer. The coagulant added and aged by the salt of iron is present as a coexisting salt in a small amount of complex salt.

In the above method, the addition of a salt of iron to the aluminum chloride solution gives great significance as a flocculant.

A basic aluminum salt in the nature Referring to Al and the pure basic aluminum chloride which does not include anything other than Cl in the sample solution PH, viscosity, UV absorption spectra LE Al ₂ O ₃ concentration, and Al ³⁺ / Cl ^- (N) ratio As a result of examining how it changes by, the pH becomes smaller as the Al ₂ O ₃ concentration increases, and the smaller the Al / Cl (N) ratio is. The viscosity increases with increasing Al ₂ O ₃ concentration but the cone side of the Al / Cl- (N) ratio is small. This is indicated by the Al / Cl (N) ratio of the basic salt solution. In the ultraviolet absorption spectrum, basic aluminum chloride has a different structural form from AlCl _3, and it can be estimated that its binding state is Al (OH) ₂ n.

Such aluminum salts alone are highly deliquescent, and are not safe basic salts.

On the other hand, as a result of studying the basic salt of aluminum iron coexistence system, it can be seen that it can exist as a safe solution only in aluminum and iron coexistence system. In this case, the safe area is the molar ratio of iron and aluminum and Al ⁺ Fe / Cl ( N) I learned that it depends on all the conditions of boiling.

The basic salt of the aluminum iron coexistence system thus obtained is extremely safe and has the following characteristics as a coagulant.

First, to reduce deliquescent and corrosiveness,

Second, the Fe (OH) ₃ fulllock is produced faster than the Al (OH) ₃ fulllock, which becomes agglomerate nucleus to make a heavy fulllock.

Third, since it can be injected at any concentration, it can be easily operated.

Fourth, in normal water treatment, even if a large amount is injected, the pH of the treated water remains almost neutral, but it is not necessary to use an alkali preparation like other flocculants.

Fifth, the PH width is suitable for the flocculant.

In addition, in this method, hydrochloric acid is directly reacted with metal aluminum, so that it can be treated at normal pressure without using a pressure vessel requiring high pressure, compared to a method of manufacturing by reacting aluminum hydroxide with hydrochloric acid, without applying a separate heat source. The reaction can be performed by self-heating by exothermic reaction, which has the advantage of saving energy. Furthermore, it is possible to use discarded aluminum cans or, in some cases, waste acid, which is an acid treatment waste, which is a great advantage in terms of pollution prevention and economics. It can be said to have a way.

[Effects of the Invention]

In order to measure the effect of the inorganic polymer flocculant mainly composed of aluminum chloride obtained in the present invention, artificial turbid water was prepared as an example, and aluminum sulfate and treatment effects were compared.

[Example (1)]

A certain amount of kaolin knight was suspended in distilled water, and a fixed amount of artificial turbid water was taken after standing for a certain time. Its turbidity was IONTR, COD 3 mg / l, AIK, 45 mg / l PH (20 ° C.) 6.5. After taking the preparation water in the 500ml beaker and adding the appropriate amount for each flocculant was observed and recorded the quality and condition of the treated water after 150rpm 1min, 45rpm 15min, 30 minutes stationary, the treatment effect for each flocculant as shown in Table 1 was obtained.

Table 1. Treatment Effect by Coagulant

Claims (1)

108 parts by weight of metal aluminum and 630 parts by weight of hydrochloric acid having a concentration of 15% to 35% are reacted for about 30 minutes to 1 hour under atmospheric pressure while maintaining the temperature at 100-110 ° C. in an acid reactor equipped with a stirrer. Aluminum chloride characterized by aging at least one kind of ferric chloride, ferric chloride, ferrous sulfate, ferric sulfate, polyiron chloride, and polysulfate by adding 0.2-1% by weight The manufacturing method of the inorganic polymer flocculant which has a main component.