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| Number | Title | Issue Date |
| 6843976 | Reduction of zinc oxide from complex sulfide concentrates using chloride processing An apparatus and a process for producing zinc oxide from a zinc-bearing material are provided. The process comprises the steps of leaching the complex sulfide material with hydrochloric acid, ferric chloride, and oxygen; precipitating iron from the leach solution us... | 01/18/2005 |
| 6726889 | Production of zinc oxide from acid soluble ore using precipitation method The present invention relates to an apparatus and a process for producing zinc oxide from an acid soluble zinc-bearing material. The process according to the present invention comprises the steps of leaching the zinc oxide material with sulphuric acid; precipitating... | 04/27/2004 |
| 6395242 | Production of zinc oxide from complex sulfide concentrates using chloride processing The present invention relates to an apparatus and a process for producing zinc oxide from a zinc-bearing material. The process according to the present invention comprises the steps of leaching the complex sulfide material with hydrochloric acid and oxyge... | 05/28/2002 |
| 6391270 | Method for removing manganese from acidic sulfate solutions A method and apparatus for precipitating manganese from acidic sulfate solutions, and more specifically from zinc leach solutions, without removing zinc. A zinc- and manganese-containing solution is treated with an SO2 --O2 gas mixtu... | 05/21/2002 |
| 6330513 | Prospecting technique Disclosed herein is a technique of prospecting for deep massive sulfide ore bodies, comprising the steps of selecting a geologic region which is substantially acoustically transparent; directing seismic waves at the region and collecting reflected or diff... | 12/11/2001 |
| 6228270 | Process for reducing selenium and mercury from aqueous solutions The present invention relates to an apparatus for removing volatile impurities such as mercury and selenium from a weak acid solution resulting from scrubbing gases created in the production of sulfuric acid by roasting of sulfide concentrates. The appara... | 05/08/2001 |
| 6089079 | Moisture sensor for ore concentrates and other perticulate materials The present invention is concerned with a moisture sensor for measuring the moisture content of particulate material like ore concentrates. The sensor comprises a body having one end to be buried within the bulk of the particulate material and the other e... | 07/18/2000 |
| 6079251 | Diesel exhaust analysis system and method of using the same The present invention is concerned with a system and method for monitoring the exhaust emissions of combustion engines such as diesel engines equipment used in underground mining operations. The system comprises a gas analyzer capable of measuring the con... | 06/27/2000 |
| 5961691 | Recovery of lead and others metals from smelter flue dusts The present invention is concerned with a process for extracting and recovering lead or lead derivatives in high purity from various materials containing lead sulphate, and particularly copper smelter flue dusts. The present process also allows the substa... | 10/05/1999 |
| 5941921 | Sensor feedback control for automated bucket loading Automated bucking loading is achieved through the use of sensor feedback provided by pressure and extension sensors on hydraulic cylinder(s) to control the trajectory of the bucket to be loaded by a computer algorithm. Additional sensors may be used to pr... | 08/24/1999 |
| 5939042 | Tellurium extraction from copper electrorefining slimes The present invention is concerned with a method for the substantially selective extraction of tellurium from copper electrorefining slimes. The method comprises maintaining a molar ratio Ag/Se, Ag/S or Ag/Se+S at a value of about 2 or less in the slimes ... | 08/17/1999 |
| 5914440 | Method and apparatus removal of solid particles from magnesium chloride electrolyte and molten magnesium by filtration The present invention is concerned with a system for the filtration of molten material. The system is particularly useful for removing MgO impurities present in molten magnesium chloride electrolyte. The invention also comprises a method for removing soli... | 06/22/1999 |
| 5427691 | Lime neutralization process for treating acidic waters A lime-treatment method is disclosed to neutralize acidic waters containing heavy metals and sulphate and precipitate the metals as hydroxides along with calcium sulphate solids which are called sludge. The method comprises neutralizing the water in two r... | 06/27/1995 |
