JPH08196806A - Adsorption treatment of tellurium-containing solution - Google Patents

Abstract

PURPOSE: To efficiently adsorb and separate Te from a Te-contg. soln. and to reduce the concn. of Te in treated water. CONSTITUTION: A Te-contg. soln. is brought into contact with an adsorbent obtd. by carrying a compd. of at least one kind of metal selected from among Ti, Zr, Hf, La, Ce, Pr, Nd, Sm, Eu and Gd on a carrier to adsorb and separate the Te in the Te-contg. soln.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to tellurium which is widely used for special steel modifiers, intermetallic compounds for electronic devices, etc., and the production of such compounds, and the use and disposal of these tellurium-containing products. The present invention relates to an adsorption treatment method for tellurium-containing solution, which can separate tellurium in tellurium-containing solution.

[0002]

2. Description of the Related Art Conventionally, as a method of separating tellurium from a tellurium-containing solution, for example, a precipitate produced by immersing copper in a tellurium-containing electrolytic solution discharged from a nonferrous metal refining process and substituting the tellurium for copper is formed. Methods of separating are known.

[0003]

However, it is difficult to control the amount of copper added by the method of immersing copper in the above-mentioned tellurium-containing electrolytic solution and substituting the tellurium for copper and separating the generated precipitate. However, there is a problem that the removal rate of tellurium is greatly influenced by the amount of copper added, the treatment accuracy is poor, and the tellurium cannot be efficiently separated. An object of the present invention is to provide an adsorption treatment method for a tellurium-containing solution, which can efficiently adsorb and separate tellurium from the tellurium-containing solution and can reduce the tellurium concentration in the treated water to a low concentration. It is a thing.

[0004]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that elements of titanium, zirconium, hafnium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, and gadolinium. Based on this finding, it is possible to solve the above problems by bringing an adsorbent having at least one metal compound selected from the group supported on a carrier into contact with a tellurium-containing solution. Reached That is, the present invention relates to titanium, zirconium, hafnium,
Tellurium contained in a tellurium-containing solution by contacting an adsorbent in which at least one metal compound selected from the element group of lanthanum, cerium, praseodymium, neodymium, samarium, europium, and gadolinium is supported on a carrier with a tellurium-containing solution. The gist is a method for adsorption treatment of a tellurium-containing solution, which is characterized by adsorbing and removing

The present invention will be described in detail below. As the adsorbent used in the present invention, at least one metal compound selected from the element group of titanium, zirconium, hafnium, lanthanum, cerium, praseodymium, neodymium, samarium, europium and gadolinium is supported on a carrier. Yes, especially at least 1 selected from the group of elements titanium, zirconium, hafnium, cerium
Those in which a metal compound of a kind is supported on a carrier are preferable. The carrier used in the present invention is preferably granular, and its particle size is suitably 0.2 to 2 mm.
Organic polymer materials such as phenol resin and polystyrene are preferable as such materials, and natural zeolite, synthetic zeolite, acid clay, silica gel,
Examples thereof include silica-alumina gel, granular activated carbon, molecular adsorbent resin, synthetic granular activated carbon, ion exchange resin and chelate resin.

The metal compound may be supported on the carrier in the form of a metal chloride or oxide. The amount of the metal compound supported on the carrier at that time is preferably 50 to 500 g, and more preferably 100 to 300 g, per liter of the carrier. Further, as a method for supporting the metal compound on the carrier used in the present invention, the solution or slurry of the metal compound and the carrier are put into a container and stirred or mixed, or the solution of the metal compound is added to the carrier. It is preferable that the metal compound is supported on the carrier by passing the solution through a column packed with and contacting it. The adsorbent used in the present invention may be a commercially available product, and a preferred specific example thereof is zirconium oxychloride (ZrO 2).
A granular adsorbent "Uniselec UR-3700S" (manufactured by Unitika Ltd.) in which Cl ₂ .8H ₂ O) is supported on polystyrene is exemplified.

The tellurium-containing solution to be used in the present invention includes, for example, tellurium which is widely used in special steel modifiers, intermetallic compounds for electronic devices, etc., and the production of such compounds, and the use of these tellurium-containing products. And the tellurium-containing solution discharged at the time of disposal. In the present invention, the pH of the tellurium-containing solution to be brought into contact with the adsorbent is 1 to 3 or 6 to 12, and more preferably the pH of the tellurium-containing solution is 1 to 2 or 8 to 12. Therefore, it is preferable to adjust with hydrochloric acid or caustic soda. If the pH of the tellurium-containing solution exceeds 12,
Tellurium is less likely to be adsorbed on the above adsorbent. Further, when the pH of the tellurium-containing solution is higher than 3 and lower than 6, tellurium is less likely to be dissolved and is easily blocked without being adsorbed by the adsorbent packed in the column. Furthermore, when the pH of the tellurium-containing solution is less than 1, it becomes difficult for the tellurium to be adsorbed only in a trace amount.

In the present invention, it is necessary to bring the adsorbent into contact with the tellurium-containing solution. Usually, the adsorbent is packed in a column and the tellurium-containing solution is subjected to space velocity (SV) = 2 to 20 hr. It is preferable to pass the solution in a downward flow of ^-1 to bring it into contact with the adsorbent. At this time, in the case where the tellurium-containing solution contains a suspended substance, it is preferable to remove the suspended substance by solid-liquid separation by filtration, precipitation or the like, and then contact the adsorbent.

Next, in the present invention, in order to elute the tellurium adsorbed on the adsorbent, for example, sodium hydroxide (NaOH) having a concentration of 40 g / liter or more is used with a volume of 2 liter / liter-adsorbent or more. , Tellurium can be eluted by passing the adsorbent adsorbing tellurium at a space velocity (SV) of 5 hr ⁻¹ or less in a downward flow.

[0010]

In the present invention, although the detailed adsorption mechanism is unknown, for example, the granular adsorbent "Uniselec UR-370" is used.
When a tellurium-containing solution adjusted to pH 1 to 3 or 6 to 12 is brought into contact with "0S" (manufactured by Unitika Ltd.), Cl and Te are replaced and Te is adsorbed as shown in the following formula, so that a strong solution is obtained. It is considered that the bond of "-Zr-Te" is formed and tellurium can be adsorbed and separated.

[0011]

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[0012]

EXAMPLES Next, the present invention will be described in detail with reference to examples. Example 1 First, sodium tellurite pentahydrate (Na ₂ TeO
₃ · 5H ₂ O) 5.63g, sodium sulfate (Na ₂ S
O ₄ ) 12.8 g, 35 wt% hydrochloric acid (HCl) 200 g
Is dissolved in water, pH is 1.3, suspended matter (SS) 1m
18 liters of tellurium-containing solution containing less than g / liter, tellurium (Te) 128 mg / liter, and sodium sulfate (Na ₂ SO ₄ ) 710 mg / liter were prepared.

Next, a commercially available granular adsorbent "Uniselec U" is used.
60 ml of "R-3700S" (manufactured by Unitika Ltd.) was packed in a glass column having a diameter of 9 mm.

The above tellurium-containing solution was passed through a glass column in a downward flow at a space velocity (SV) = 5 hr ^-1 (0.3 liter / hr) for adsorption treatment, and a passing amount of 25 liters. / L-The treated water was sampled for each adsorbent (1.5 L), and the tellurium concentration was measured by an atomic absorption photometry.

Further, 80 g / liter of sodium hydroxide (NaOH) 3 liter / liter-adsorbent (0.18 liter) and water 1 liter / liter-was added to the granular adsorbent "Uniselec UR-3700S" which adsorbed tellurium. The adsorbent (0.06 liter) was passed through in a downward flow at a space velocity (SV) = 2 hr ⁻¹ (0.12 liter / hr) to elute tellurium to obtain an eluent. The tellurium concentration in the eluent was measured.

As a result, the tellurium concentration of the treated water was as low as 0.001 mg / liter up to the flow rate of 175 liters / liter-adsorbent (10.5 liters). UR-3700S "
22.4 g of tellurium could be adsorbed and separated per liter. The tellurium concentration in the eluent is 558.
At 0 mg / liter, the elution rate was 99.6%.

Example 2 First, sodium tellurite pentahydrate (Na ₂ TeO
₃ · 5H ₂ O) 11.3g, sodium sulfate (Na ₂ S
O ₄ ) 25.6 g, 35% by weight hydrochloric acid (HCl) 0.41
g dissolved in water, pH 8.6, Suspended substance (SS) 1
36 liters of tellurium-containing solution containing less than mg / liter, tellurium (Te) 128 mg / liter and sodium sulfate (Na ₂ SO ₄ ) 710 mg / liter were prepared.

Next, a commercially available granular adsorbent "Uniselec U" is used.
60 ml of "R-3700S" (manufactured by Unitika Ltd.) was packed in a glass column having a diameter of 9 mm.

The above tellurium-containing solution was passed through a glass column in a downward flow at a space velocity (SV) = 5 hr ⁻¹ (0.3 liter / hr) for adsorption treatment, and a passing amount of 25 liters. / L-The treated water was sampled for each adsorbent (1.5 L), and the tellurium concentration was measured by an atomic absorption photometry.

In addition, in the granular adsorbent "Uniselec UR-3700S" having adsorbed tellurium, 80 g / liter of sodium hydroxide (NaOH) 3 liter / liter-adsorbent (0.18 liter) and water 1 liter / liter- The adsorbent (0.06 liter) was passed through in a downward flow at a space velocity (SV) = 2 hr ⁻¹ (0.12 liter / hr) to elute tellurium to obtain an eluent. The tellurium concentration in the eluent was measured.

As a result, the tellurium concentration of the treated water was as low as 0.001 mg / liter up to the flow rate of 425 liters / liter-adsorbent (25.5 liters). UR-3700S "
54.4 g of tellurium could be adsorbed and separated per liter. The tellurium concentration in the eluent is 135
At 00 mg / liter, the elution rate was 99.3%.

[0022]

According to the present invention, tellurium can be efficiently adsorbed and separated from the tellurium-containing solution, and the tellurium concentration of the treated water can be reduced.

Claims (1)

[Claims] 1. An adsorbent in which at least one metal compound selected from the group of elements of titanium, zirconium, hafnium, lanthanum, cerium, praseodymium, neodymium, samarium, europium and gadolinium is carried on a carrier, and a tellurium-containing solution. A method for adsorption treatment of a tellurium-containing solution, which comprises adsorbing and separating tellurium in the tellurium-containing solution by contacting with.