Controlled in-situ leaching of mineral values专利检索-含氮废物废物处理与管理专利检索查询-专利查询网

Controlled in-situ leaching of mineral values

阅读：321发布：2021-09-07

专利汇可以提供Controlled in-situ leaching of mineral values专利检索，专利查询，专利分析的服务。并且A freezing liquid, usually a liquified gas easily vaporized by the absorption of heat, e.g. liquified oxygen or nitrogen, is injected into or around an underground area to be treated for the recovery of solid mineral values, usually a naturally occurring deposit of such mineral values as copper sulfides or oxides or a mine waste dump containing same. When injected under pressure into an area of low permeability, the freezing liquid effects hydraulic fracturing of the mineralized solid materials. Control of the operation is preferably achieved by freezing either natural ground water or injected water in boundary zones, e.g. relatively pervious zones adjacent to relatively impervious zones, to provide barriers against dissipation, into such boundary zones, of both the injected freezing liquid and subsequently injected leaching or other treatment fluid. In the instance of natural ground water at least, air under pressure may be advantageously introduced into the area to be treated immediately prior to the introduction of the freezing liquid. When sulfide minerals are involved, liquid oxygen as the freezing liquid will aid in fracturing the underground formation by reason of volume increase due to chemical reaction with the sulfide.，下面是Controlled in-situ leaching of mineral values专利的具体信息内容。

权利要求

2. A method according to claim 1, wherein the freezing liquid is introduced under pressure sufficient to effect fracturing of said underground area and constitutes pressurized fluid within the area.

3. A method according to claim 1, wherein the mineral values to be recovered are metallic and in sulfide form, and the freezing liquid is liquified oxygen.

4. A method according to claim 1, wherein water is injected into one or more relatively dry and pervious control locations contiguous with the area to be treated, so as to freeze and provide a temporary barrier to flow from said area.

5. A method according with claim 1, wherein a gas is first injected into the area under pressure to displace any ground water present to one or more control barrier locations.

6. A method in accordance with claim 5, wherein the gas is oxygen.

7. A method according to claim 1, wherein the freezing liquid is a vaporizable liquified gas.

8. A method according to claim 1, wherein the mineral values to be recovered are metallic and in sulfide form, and the freezing liquid is liquified oxygen.

9. A method according to claim 8, wherein the mineral values to be recovered comprise at least a copper sulfide.

10. A method according to claim 1, wherein the treatment fluid is a leaching agent for solid mineral values in the underground areas.

11. A method according to claim 1, wherein the freezing liquid is first pumped into the area concerned under minimum pressure to accomplish freezing of any water present in the formation, and is then pumped under greatly increased, formation fracturing pressure for a period of time required to hydraulically fracture the formation.

12. A method according to claim 1, wherein a propping agent is introduced into the fractured underground area.

13. A method according to claim 1, wherein the freezing liquid is first injected into the borders Of the underground area for establishing barriers to fluid flow from said area; and wherein the pressurized fluid is subsequently introduced into the said area for fracturing the same.

14. A method according to claim 1, wherein the mineral values to be recovered are metallic and in sulfide form, and pressurizing fluid is obtained by injecting liquid oxygen into said area.

15. A method of recovering solid mineral values in situ, comprising injecting a freezing liquid into or bordering an underground area containing said mineral values, said freezing liquid being introduced under pressure sufficient to effect fracturing of said underground area; thereafter treating said mineral values by the injection into said area of a treatment fluid; and recovering the so-treated mineral values.

说明书全文

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Controlled in-situ leaching of mineral values

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