Abstract:
The invention relates to a process for the extraction of gold and silver from ores and mining by-products. The process according to invention consists in treating ores and mining residues having a content of 0.5... 12 ppm Au with a solution of ammonium thiosulphate, recycled at a temperature of 15 - 25°C; the filtrate resulting after solubilization is subjected to an electrolytic extraction with high-alloy electrodes with a current density of 200...250 A/m 2 , until the electrolyte reach a concentration of 5-15 ppm Au, 1-100 ppm Ag and 0.1 - 1.0 g/1 Cu; afterwards, the separated cement is filtered off and dissolved in aqueous ammonia, dried at a temperature of 105°C and melted at a temperature of 1200°C, resulting a Au-Ag alloy, which is processed by electrochemical and thermal refining operations, from which there are obtained Au and Ag of high purity.
Abstract translation:本发明涉及从矿石和采矿副产物中提取金和银的方法。 根据本发明的方法在于用硫代硫酸铵溶液处理含量为0.5〜12ppm Au的矿石和采矿残渣,在15-25℃的温度下再循环; 在溶解后产生的滤液用电流密度为200〜250A / m 2的高合金电极进行电解提取,直到电解液达到5-15ppm Au,1-100ppm Ag和0.1 - 1.0g / l Cu; 然后将分离的水泥滤出并溶解在氨水中,在105℃的温度下干燥并在1200℃的温度下熔融,得到通过电化学和热精炼操作处理的Au-Ag合金, 其中获得了高纯度的Au和Ag。
Abstract:
The present invention relates to a method for solidifying a mass of liquid sulfur comprising the following operative phases: (a) pouring a mass of liquid sulfur into a solidification pond and forming a layer of sulfur which spreads over the surface onto which it is poured at a spreading rate ranging from 1 to 10 cm/s, preferably from 1 to 5 cm/s, and interrupting said pouring when said layer of sulfur has reached a thickness ranging from 5 to 12 cm, preferably from 7.5 to 10 cm; (b) cooling said layer of sulfur until the temperature of its upper surface is lower than or equal to 65°C, more preferably equal to or lower than 60°C, and forming a block of solid sulfur. The present invention also relates to a monolayer or multilayer block of solid sulfur which can be obtained with the above method, in addition to portions of solid sulfur which can be obtained by cutting the above blocks.
Abstract:
The present invention relates to a method for casting of molten electrolyte tapped from electrolytic cells for production of aluminium. Molten electrolyte is continuously supplied to one end of a rotating drum which is partly filled with particulate solidified electrolyte whereby the molten electrolyte solidifies in the form of particles. The solidified particles are continuously discharged through a discharge opening in the other end of the drum, said discharge opening being at a lower level that the inlet opening for molten electrolyte.
Abstract:
A molten metal reactor (10) quickly entrains a feed material in the molten reactant metal (16) and provides the necessary contact between the molten reactant metal and the feed material to effect the desired chemical reduction of the feed material. The reactor (10) includes a unique feed structure (24) adapted to quickly entrain the feed material into the molten reactant metal (16) and then transfer the molten reactant metal, feed material, and initial reaction products into a treatment chamber (12). A majority of the desired reactions occur in the treatment chamber (12). Reaction products and unspent reactant metal are directed from the treatment chamber (12) to an output chamber (14) where reaction products are removed from the reactor. Unspent reactant metal (16) is then transferred to a heating chamber (15) where it is reheated for recycling through the system.
Abstract:
A modular apparatus for the production of molten metal by self reduction of agglomerates of metal oxide or of prereduced metal, which may be iron. The apparatus is typically a shaft furnace of modular construction and includes a plurality of connected cells of identical size and construction. Each apparatus is connected to equipment for supplying the agglomerates for reduction or melting and refining within a reduction chamber or melting chamber, respectively, of each cell.
Abstract:
An apparatus and method for reclaiming metal chips formed while machining metal castings to their finished shape. The apparatus includes a stationary charging tube (100) extending in a generally perpendicular direction from the charge well of a reverberatory furnace. The lower end of the charging tube is attached to a box-shaped structure (101) which has an open bottom. The sides of the structure extend into a pool of molten metal contained in the charge well. A variable rate feeder (38, 39 and 40) provides a continuous supply of metal chips to the charging tube (100) at a rate which is essentially the same as the rate at which the chips are being produced. The chips form a column (140) within the charging tube which extends through the box-shaped structure (101) and into the pool of molten metal (86). As the chips at the bottom of the column are melted, additional chips are added to the top, forcing the bottom of the column of chips into the pool of molten metal.
Abstract:
The proposed process for the continuous refining of metal involves the following steps: molten metal is fed into a reaction chamber; gaseous and solid oxidising agents are introduced; loose materials are added; the metal and slag are totally converted to a foaming emulsion; a raised pulsed pressure is created within the reaction chamber and the system is made to deviate significantly from thermodynamic equilibrium by the creation of a self-adjusting system of chemical gas-producing reactions; the emulsion is removed to a settling tank at the critical outflow-rate of the two-phase liquid; and the metal and slag are separated in the settling tank and gas is removed at a predetermined rate through the thick emulsion layer. The proposed facility for the continuous refining of metal comprises: a spherical reaction chamber (1) with a channel through which the liquid metal (5) and loose materials (4) can be introduced; a device in the form of opposing tuyeres for supplying gaseous oxygen; a cylindrical connecting channel (2); a settling tank (3) with tap holes to allow the removal of metal (20) and slag (15) and divided into two vertical channels to facilitate the separation of slag (16) and gas (17); a channel for feeding in slag-forming materials (13); and tuyeres for supplying oxygen (11 and 12).