Thiobacillus thiooxidansgrowth inhibitor, cement composition, and cement structure
US6224658A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1999 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Mar 12, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/67
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
To provide a Thiobacillus thiooxidans growth inhibitor, a cement composition, and a cement structure which are capable of inhibiting effectively growth of Thiobacillus thiooxidans not only in the neutral pH range but also in the acidic pH range of 4 or below, of which active component metal ions are sufficiently prevented from being dissolved and released when contained in a cement structure, and of which effect can be maintained for a prolonged period of time. The inhibitor contains a first component selected from the group consisting of nickel phthalocyanine powders, powders of a nickel phthalocyanine derivative, and mixtures thereof, and a second component selected from the group consisting of tungsten powders, powders of a substantially water-insoluble tungsten compound, a water-soluble salt of tungstic acid turning to substantially water-insoluble when reacted with cement, and mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.