JPS58143885A - Purification of ferrous ion-contg. mine water - Google Patents

Abstract

PURPOSE:To form ferrite suited to a good use at an ordinary temperature, by oxidizing a part of Fe<2+>-contg. mine water at pH below a specified value, adsorbing Si dissolved in the remainder of the mine water with the obtained Fe(II)-contg. precipitate, and then properly oxidizing the residual liquid. CONSTITUTION:In the purification of Fe<2+>-contg. mine water in which Si coexists, a part of said mine water is oxidized at pH below 5 at first, and the formed Fe(II)-contg. precipitate is separated and recovered. In succession, the precipitate is added to the remainder of the mine water, and the mine water is adjusted to pH below 6 by the addition of alkali to adsorb a dissolved Si part with the precipitate and to separate it. Thereafter, the residual Fe<2+>-contg. liquid is divided into two parts at a ratio of 2:1. The 2/3 part of the Fe<2+>-contg. liquid is oxidized by blowing oxygen or air into it or agitating it at a high speed in an oxidizing atmosphere, to form a Fe(II-contg. liquid. In succession, the residual Fe<2+>-contg. liquid and alkali are added to the oxidized liquid and mixed together at pH above 7, to form black ferrite.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating water containing ferrous ions in which silicon (Si) coexists.

Conventionally, a well-known method for removing water containing ferrous ions is to oxidize ferrous ions to ferric ions, add an alkali to generate hydroxides, and remove the ferrous ions. On the other hand, a method is known in which ferrite is produced by adding and mixing an alkali to a solution in which ferrous iron coexists in a ratio of 1=2. However, in this method, if Si coexists in the liquid, the production of ferrite is inhibited or becomes impossible. i.e. 8 ioz to 3 op
It is difficult to produce ferrite from ferrous ion-containing water containing about pm to 1,100 pp. Normally, ferrous ion-containing water containing 87 is a mixture of ferrous ions, ferric oxides, and alkali. It is processed by adding ferric hydroxide. With this method, the large amount of sediment generated by treating water is disposed of in a landfill, but it has been difficult to select a landfill site that can handle the huge amount of sediment generated over the years. Therefore, effective utilization of the sediment is urgently desired.

The object of the present invention is to solve these problems and provide a method for producing ferrite which can be used effectively at room temperature from a ferrous ion-containing water retardant in which Si coexists.

That is, in the method according to the present invention, when treating antiferrous water containing ferrous ions in which Si coexists, a part of the antihydric water is first kept at a pH below PHs by blowing oxygen or air into it, or by stirring at high speed in an oxidizing atmosphere. Collect the ferric-containing precipitate generated, add this ferric-containing precipitate to the remainder of the anti-water bottle, add an alkaline agent to adjust the pH to 6 or less, and remove the SL in the anti-hydrochloric acid.
After separating the components by adsorption to the ferric-containing precipitate, the remaining ferrous-containing liquid was divided into two parts in a ratio of 2 to 1, and the ferric-containing precipitate was separated.
By blowing oxygen or air into 2/3 of the iron ion-containing liquid,
After stirring at high speed in an oxidizing atmosphere and oxidizing to obtain a ferric-containing liquid, the remaining 173 ferrous ion-containing liquid and an alkali are added to the vaginal fluid and mixed at a pH of 7 or higher to form a black ferromagnetic precipitate. It is characterized by producing a substance (ferrite).

The ferrite produced by carrying out the present invention can be reused as a radio wave absorbing material and fine particle magnetic powder such as magnetic fluid Kawahara O-1, and this delicate closed cycle is truly useful for effectively reusing waste. bring.

In the method of the present invention, 1) a ferric-containing precipitate produced by oxidizing a ferrous ion-containing antihydrogen at I-45 or less is used as an adsorbent for Si; The precipitate adsorbs a high concentration of Si in the anti-water solution, and has little effect as a Si remover.

S in water containing ferrous ions due to ferric precipitates
The higher the pH, the stronger the removal effect of + is, but as the pH increases, the Fe2+ concentration used for the ferrite reaction decreases, so in practice it is best to adjust the pH to 6 or below.

Further, in order to produce ferrite from a coexisting solution of ferrous and ferric iron according to the method of the present invention, the pH during the reaction must be 7 or higher.

Furthermore, in the method of the present invention, the composition ratio of ferrous and ferric iron is Fe
(III)/Fe(II)-1.5 to 3.0 can also produce a magnetic material, but Fe ([1)/
When F e (II) = 2, ferrite with the strongest magnetic properties can be obtained.

In addition, if it takes a long time to mix the ferrous and ferric iron coexisting solution to produce ferrite according to the method of the present invention, depending on the water resistance properties, it may take a long time in a non-oxidizing atmosphere such as nitrogen or helium. Preferably mixed.

The present invention will be explained in more detail with reference to Examples below.

Example total Fe 1,1100pp, kl 1100pp
, 5iO containing 145 ppm was treated according to the method of the present invention as follows. In other words, water resistance 21KC
a-CO3 was added to maintain pH4, oxygen was blown in to oxidize dissolved Fe, and the vaginal fluid was filtered to obtain ferric iron precipitate. Next, the precipitate was treated with anti-water IA! CaCO3
was added to adjust the pH to 5.5, followed by filtration. F liquid is all Fe
1,050 ppm, A10.5 ppm, 5
It contained i027 ppm.

In order to clarify the effect of the present invention, a case in which the precipitate was not added, which was not based on the method of the present invention 5-, was treated in the same manner. That is, Ca-CO3 was added to anti-water 11 to adjust the pH to 5.5, and then filtration was performed. Neu in P liquid, t
y concentration is total Fe 1,070 ppm + Ali p
It was pm +81023299m.

Next, 0.61 of each P solution was divided into 2 parts, 0.41 and 0.21, respectively, and oxygen was first blown into 0.4'l of the furnace solution to disperse all 2+ Fe ions to make a brown colored solution. Add the remaining P solution 0.21 and Ca(OH)z to the solution to adjust the pH.
8 was stirred and mixed in a nitrogen atmosphere. Stirring 1
After 0 hours of treatment according to the method of the present invention, the precipitate was a black ferromagnetic precipitate. On the other hand, the precipitate not treated according to the method of the present invention was dark green and had no magnetic properties.

The effects of the present invention will not change even if sodium hydroxide, potassium hydroxide, etc. are used as the alkali used in the present invention in addition to the calcium carbonate and calcium hydroxide shown in the examples.

Agent BU F. Uchihara Susumu -6=

Claims (1)

[Claims] When treating water containing ferrous ions in which silicon coexists, a part of the water is heated to a pH of 5 or less, the ferric-containing precipitate produced is separated and collected, and this is added to the remainder of the water. The dissolved silicon component was adsorbed and separated by the ferric-containing precipitate, and the remaining ferrous ion-rich solution was divided into two at a ratio of 2:1. After oxidizing 2/3 of the ferrous ion-containing liquid to obtain a ferric iron-containing liquid, the remaining 173 ferrous ion-containing liquid and an alkali are added to the liquid and mixed at a pH of 7 or higher to form ferrite. A method for treating ferrous ion-containing anti-water, characterized by producing ferrous ion-containing anti-water.