JPH0672815A - Method for preventing deterioration of sulfur-containing mineral - Google Patents

Abstract

PURPOSE:To easily and efficiently prevent the deterioration of a sulfur- containing mineral caused by a sulfur-oxidizing bacterial strain of the genus Thiobacillus and prevent the generation of sulfuric acid by bringing the sulfur- containing mineral into contact with a substance containing a nickel compound such as Ni, NiO and NiCl2. CONSTITUTION:The deterioration of a sulfur-containing mineral caused by a sulfur-oxidizing bacterial strain of the genus Thiobacillus can be prevented simply by bringing the mineral into contact with a material containing a nickel compound such as Ni, NiO, NiCO3, NiCl2 and Ni(ClO3)2 in the form of an aqueous solution, aqueous dispersion, aqueous suspension or a mixture with cement, etc. The process can easily and efficiently prevent the deterioration of a sulfur- containing mineral and the generation of sulfuric acid in an abandoned mine, etc. The nickel-containing material in contact with the sulfur-containing mineral can be recovered by neutralizing and precipitating with carbonated water, sodium bicarbonate, calcium carbonate, etc. The treatment of the mineral can be carried out at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing deterioration of sulfur-containing minerals, and more specifically, for preventing deterioration of sulfur-containing minerals by sulfur-oxidizing bacteria of the genus Thiobacillus in abandoned mines and the like. The present invention relates to a method for preventing deterioration of sulfur-containing minerals for preventing the occurrence of sulfur.

[0002]

2. Description of the Related Art Conventionally, acidic leachate has flowed out in abandoned mines, causing natural destruction, damage to the agricultural and fishery industries, deterioration of concrete structures, etc., and preventing such acidic leachate runoff. Is being considered. Such acidic effluent generally causes sulfur-containing minerals such as marcasite and pyrite in abandoned mines to be exposed to an oxidizing atmosphere by mining,
It is known that the cause is that it is oxidized by sulfur-oxidizing bacteria of the genus Thiobacillus existing in rainwater in an abandoned mine to generate sulfuric acid.

Therefore, conventionally, in such an abandoned mine, the amount of water that flows into or permeates the sulfur-containing mineral exposed to an acidic atmosphere is reduced, or the water that flows out from such an abandoned mine is converted to lime or the like. Methods such as neutralization and removal of precipitates followed by outflow are adopted.

However, the method of reducing the amount of water flowing into or permeating the sulfur-containing mineral has almost no effect, and the method of neutralizing the outflow water is a sulfur-oxidizing bacterium of the genus Thiobacillus, which causes deterioration of the sulfur-containing mineral. Since it does not sterilize or sterilize itself, the neutralization treatment must be carried out continuously, and therefore requires a large amount of money, and further, the heavy metal deposited during neutralization is continuously discarded. There is a drawback that it is necessary to install a yard for continuous management and manage it continuously.

[0005]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a method for preventing deterioration of sulfur-containing minerals which can efficiently and easily prevent deterioration of sulfur-containing minerals and prevent generation of sulfuric acid in abandoned mines. To provide.

[0006]

According to the present invention, there is provided a method for preventing deterioration of a sulfur-containing mineral by a sulfur-oxidizing bacterium of the genus Thiobacillus, which comprises contacting the sulfur-containing mineral with a nickel compound-containing material. A method for preventing deterioration of a sulfur-containing mineral is provided.

The present invention will be described in more detail below.

In the deterioration prevention method of the present invention, for example, Ni,
NiO, NiCO ₃ , NiCl ₂ , Ni (ClO ₃ ) ₂ , N
i (ClO ₄ ) ₂ , Ni (IO ₃ ) ₂ , NiPr ₂ (NO ₃ )
₁₂ , NiSO ₄ , Ni (OH) ₂ , nickel dimethylglyoxime, nickelocene and other nickel compounds in an aqueous solution,
It can be carried out by bringing a nickel compound-containing material such as an aqueous dispersion, an aqueous suspension, or a mixture with cement or the like into contact with a sulfur-containing mineral which is intended to prevent deterioration due to sulfur-oxidizing bacteria of the genus Thiobacillus.

The nickel compound-containing material is a component which reacts with sulfuric acid generated when the sulfur-containing mineral is deteriorated by sulfur-oxidizing bacteria of the genus Thiobacillus to form a sulfate, and which prevents and / or sterilizes the sulfur-oxidizing bacteria. So, in use,
It is preferable to use the nickel compound in the nickel compound-containing material in the form of a fine powder, and particularly, the average particle size of 0.001 to 0.001
It is preferably a fine powder of 0.1 mm. Further, the amount of the nickel compound-containing material in contact with the sulfur-containing mineral is such that the nickel compound in the nickel compound-containing material is 1
0.01 to 20 parts by weight, particularly 0.00
It is preferable to bring them into contact with each other in an amount of 1 to 2 parts by weight. If the amount of contact is less than 0.01 part by weight, it is difficult to maintain the antibacterial and bactericidal effects against sulfur-oxidizing bacteria for a long time, and the effect of preventing the deterioration of sulfur-containing minerals is insufficient, and 20 parts by weight. If the amount exceeds the above range, the cost is increased although the deterioration preventing effect of the sulfur-containing mineral cannot be expected to be further improved, which is not preferable.

In the method for preventing deterioration of the present invention, when the nickel compound-containing material is brought into contact with the sulfur-containing mineral, for example, when the nickel compound-containing material is in the form of a solution, dispersion or suspension, etc. , A method of injecting a nickel compound-containing material into the waste mine waste aeration or spraying the waste mine itself and immersing the sulfur-containing mineral with the nickel compound-containing material or a method of injecting the sulfur-containing mineral into the sulfur-containing mineral, and the like. The nickel compound-containing material may be injected into a sulfur-containing mineral by a known grout method or the like. Further, the two-liquid grout may be subjected to a contact precipitation method using an aqueous solution or suspension of an aqueous NiCl ₂ solution and carbonic acid, sodium bicarbonate, sodium carbonate or a mixture thereof.

In the method for preventing deterioration of the present invention, the nickel compound-containing material brought into contact with the sulfur-containing mineral can be recovered by neutralization precipitation with carbonated water, sodium bicarbonate, sodium carbonate, calcium carbonate or the like. .
At this time, the deterioration prevention method of the present invention prevents deterioration of the sulfur-containing mineral by preventing and sterilizing the sulfur-oxidizing bacteria themselves of the genus Thiobacillus, so that it is not necessary to continuously perform the contact treatment, and therefore Japanese precipitation does not have to be continuously carried out, and can be carried out at a lower cost as compared with the conventional method in which the effluent from the sulfur-containing mineral is simply neutralized.

[0012]

According to the method for preventing deterioration of sulfur-containing minerals of the present invention,
Simply by contacting the nickel compound-containing material with the sulfur-containing mineral, it is possible to effectively prevent the deterioration of the sulfur-containing mineral due to the sulfur-oxidizing bacteria of the genus Thiobacillus, and thus to prevent the deterioration of the sulfur-containing mineral particularly in abandoned mines and the like. Generation of sulfuric acid accompanying it can be prevented easily and at low cost as compared with the conventional method. Further, according to the method of the present invention, the sulfur-oxidizing bacteria of the genus Thiobacillus, which is the cause of the deterioration of the sulfur-containing mineral, are sterilized and sterilized, so that the deterioration of the sulfur-containing mineral can be prevented for a long period of time by a single treatment.

[0013]

The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited thereto.

[0014]

Example 1 Six (6) glass petri dishes each having a diameter of 10 cm and a height of 1 cm had a composition of (NH ₄ ) ₂ SO ₄ 2 per liter.
g, KNO ₃ 3g, MgCl ₂・ 6H ₂ O 0.5g, CaCl ₂・ 6H ₂ O 0.25g, FeS
_{O 4 · 7H 2 O 0.01g,} Na 2 MoO 4 · 2H 2 O 0.3mg, Na 2 S 2 O 3 · 5H 2 O 0.
5 ml of agar medium for culturing sulfur-oxidizing bacteria was put in 40 ml portions. Next, 5 g of marcasite or pyrite fine powder having a mesh size of 200 mesh or less was added to every two petri dishes, and nothing was put into the remaining two petri dishes to prepare three petri dishes. Next, 0.1 g of nickel powder of 200 mesh or less was added to one of each pair, and then commercially available sulfur-oxidizing bacteria (Thiobacillus thiooxida) were added to each petri dish.
ns) was inoculated at 10 ⁶ cells / cm ² and cultured in a incubator at 35 ° C for 1 week. After one week, the number of sulfur-oxidizing bacteria and the pH were measured. The results are shown in Table 1.

[0015]

[Table 1]

[0016]

Examples 2 to 6 Instead of nickel powder, NiO (Example 2), NiCO ₃ (Example 3), NiCl ₂ (Example 4), NiSO ₄ (Example 5) or Ni (OH) ₂ ( Culture was performed in the same manner as in Example 1 except that Example 6) was used.
The pH was measured after a week. The results are shown in Table 2.

From the results shown in Table 2, in each of Examples 2 to 6, p
Since H was near neutral, it can be seen that the number of sulfur bacteria decreased.

[0018]

[Table 2]

Claims (1)

[Claims] 1. A method for preventing deterioration of a sulfur-containing mineral by a sulfur-oxidizing bacterium of the genus Thiobacillus, which comprises contacting a sulfur-containing mineral with a nickel compound-containing material.