JPS60172348A - Collector for uranium in sea water or heavy metal ion in industrial waste water and its preparation - Google Patents

Abstract

PURPOSE:To prepare a collector capable of collecting uranium, etc. in the sea water by treating the bark of pinaceous plant with nitric acid. CONSTITUTION:The bark of pinaceous plant is dried in the air to 10-20% water content, and then crushed to 12-48 mesh grain size in a crusher. The grains of the bark are heated under ordinary pressure at refluxing temp. for 5-60min with 1,000ml 1-5% HNO3 soln. per 100g bark grain and 3-15% formalin basing on the weight of the bark grain. The treated product is washed with water sufficiently and then dried to prepare the adsorbent.

Description

[Detailed Description of the Invention] It is well known that the bark of trees of the genus Karamatsu (Nihon Karamatsu, Shiberia Akaramatsu, Douglas Fir Temple) has a high content of lignin and polyphenols. .

These aromatic groups consist primarily of catechol groups and their mether ethers.

It is well known that catechol groups collect blood metal ions in aqueous sludge as chelates, and it is also known that bark has the property of adsorbing blood metal ions.

However, since the content of free catechol groups is not so large compared to that of the metal ether, the ionic q & itu is not so large in the bark as it is. The basis of the present invention is the idea that the adsorption capacity for metal ions can be increased by removing 1100 methyl groups from methyl ether and liberating catechol groups through chemical treatment.

Missing the collection of lead ions and lead ions in waste water,
This article relates to a method for producing a scavenger for Kamekane Asahi ion, which has various 1iIt characteristics as an extremely effective adsorbent that can be produced at low cost and used in large quantities.Karamatsu bark is air-dried. After reducing the moisture content to 10-20%, grind with a 1λ mill, and collect 12-48 mesh with a sieve.

There is no need to set any particular restrictions on the size of the particles, and smoke can be released depending on the purpose and conditions of use.112
-48 mesh is the easiest to remove.

The bark particles thus obtained were treated with a solution of 1-5% nitric acid at a concentration of 1000-100 particles and 3-15% of the bark.
% of formalin for 5 to 60 minutes while refluxing at normal pressure.

A boiling time of 10 to 20 minutes is best in terms of absorption and adsorption capacity after nitric acid treatment.

Addition of formalin is useful for polymerization and immobilization of bark components.
By adding this, we can prevent the deterioration of our company's quality due to nitric acid treatment.

+1+ Single treatment with detoxifying semi-nitric acid is also effective.

The treated particles are thoroughly washed with water, dried and used as an adsorbent.

Incidentally, the same applies to the bark of not only the genus Karamatsu but also trees such as Akamatsu and Kuromatsu.

The yield is 93% when the yield is 10% and the processing time is 15 minutes.

In other words, the saturated equilibrium adsorption amount of copper ions at p)"6 is 1
- Commercially available chelate synthesis with -C already reported at 6 mmbt/g (optical comparison with 11i).

Regarding ion's citron cheeks, alkali ions, alkaline earth ions,! 1! Gold J^ ions are more likely to be adsorbed in this order.

The results of measuring the saturated equilibrium absorption WM of each ion at pH 6 are as follows.

Ship Ion is 1.7 milliequivalent/gram.

Furthermore, when an aqueous solution containing a mixture of these metal ions is treated with the present adsorption agent, only heavy metal ions are selectively adsorbed.

This is a convenient property for the purpose of collecting heavy metal ions in a solution containing a large amount of alkali ions, such as seawater.

Furthermore, the raw material for this adsorbent is usually waste, and since it can be produced extremely easily, it becomes an inexpensive scavenger, which increases the value of the present invention.

Furthermore, the fact that this adsorbent is inexpensive is extremely advantageous in operations for recovering adsorbed heavy metals, which can be accomplished by either burning the ash to recover the ash or eluting it with an acid solution of PI (1).

Next, implementation I/I will be described.

Implementation 17! I 1 Powder (24-4
8 meth) was boiled for 15 minutes with 100 d of 3% nitric acid and 1 gram of formalin in a 300 Go flask equipped with a reflux condenser. In this case, substantially the same results were obtained by treatment with nitric acid alone.

The bark powder was thoroughly washed with water and then air-dried at room temperature.

0.5 g of Honjima was added to 200 samples of a copper sulfate bath solution containing 50 p1n of copper ions and buffered to p115 with an acetate buffer and shaken at room temperature.

After 4 hours, most of the ions were absorbed and could not be detected.

Example 2 Ten grams of crushed Japanese pine bark (10-24) were heated with 100 g of 2% nitric acid and 1 g of formalin in a water bath at 98 degrees Celsius for 20 minutes.

The treated bark was thoroughly washed with water and air-dried.

0.5 g of Honjima was placed in a solution buffered to pH 5 with an acetate buffer containing 50 ppm of lead ions and shaken at room temperature.

After 4 hours, the lead ions are I) l) In 1''-Castle.

Example 3 A column was filled with 2 grams of the nitric acid-treated bark prepared in Example 1, and a mixed solution of copper chloride, calcium chloride, and sodium chloride buffered to pH 5 (copper ion IhAKe, calcium ion a degree, sodium ion a degree soppm) I
It was allowed to flow down at a flow rate of TILV.

Fractionate the effluent with a fraction collector (+1
As a result of the analysis, almost no sodium ions were adsorbed and flowed out, but calcium ions and copper ions were adsorbed.

When a pH 1 acetic acid aqueous solution was then passed through this column, first calcium ions were recovered, and then copper ions were recovered.

Example 4 0.2 grams of particles after washing 5! A system in which the water is left in the tank with 1 ttle of seawater and the seawater is exchanged every 24 hours ζrl 2
! bl-sEL 6ii; l-weight--1 weight was q5 micrograms/gram.

7 results were obtained by colorimetric determination based on Arsenazo ■.

Example 5 Two grams of the Siberian eyelid bark particles prepared in Example 1 treated with nitric acid were packed into a column, and 100 liters of seawater was allowed to flow down at a flow rate of 1 liter/7:00.

Ta.

February 14, 1982 Hiroshi Fujii Hajime

Claims (1)

[Scope of Claims] 1. A scavenger for clans in seawater and metal ions in industrial wastewater, which is obtained by treating bark powder with nitric acid. 2. A collection agent for uranium in seawater and heavy metal ions in industrial wastewater, which is made by treating bark powder with nitric acid and formalin. 3. A method for producing a scavenger for uranium in seawater and stop metal ions in industrial wastewater, which comprises treating crushed bark powder with nitric acid or nitric acid and formalin, washing with water and drying.