Method for processing granulated slag dump nickel production
(57) Abstract:The invention relates to the utilization of granulated slag and can be used for extraction of Nickel, cobalt and other valuable components from granulated slag dump Nickel production, as well as in the production of building materials. Method for processing granulated slag dump Nickel production includes drying, separation of slag into fractions and subsequent magnetic separation, drying is carried out in the environment of a reducing gas, after which the slag is separated into three fractions: +2 mm -2 to +0.4 mm and -0,4 mm and separately sephirot faction -2 - +0,4 -0,4 mm and mm, which ensures a more rich in metals concentrates, thus avoiding surgery for crushing slag, used a cheaper and convenient way of fractionation - screening, that simplifies the method for processing granulated slag Nickel production and makes it profitable. The invention relates to the utilization of granulated slag and can be used for extraction of Nickel, cobalt and other valuable components from granulated slag dump Nickel production, as well as in the production of stroiizdat, selected as a prototype, including drying, grinding in a ball mill for 60-90 with subsequent air separation emitting products classes +1.8 mm, is 1,8 mm +0.15 mm, -0,15 mm and magnetic separation joint of product class - 1.8 and +0.15 mm with obtaining magnetic and non-magnetic products (ed. St. USSR 1779064, With 22 In 7/04, "Method for processing granulated slag dump Nickel production", publ. 27.01.95), adopted as the nearest equivalent.The disadvantages of this method are its multi-stage and unprofitable.The problem faced by the inventors is the creation of a simple cost-effective method for processing granulated slag with obtaining a highly concentrated magnetic concentrate.A method for processing granulated slag dump Nickel production, including drying, separation of slag into fractions and subsequent magnetic separation, in which new is that the drying is carried out in the environment of a reducing gas, after which the slag is separated into three fractions: +2 mm -2 to +0.4 mm and -0,4 mm and separately sephirot faction -2 to +0.4 mm and -0,4 mmLaboratory and industrial tests offer the reception of the magnetic concentrate is 2.3 to 2.4%, while in the proposed method may receive two types of concentrates: 1 containing 5% Nickel and 0.5% cobalt, 2 - containing 1% Nickel and 0.1% cobalt. The higher the metal content in concentrate, the more valuable it is for further production. Experiments have shown that metals are practically absent in fractions larger than 2 mm and magnetic separation impractical. In addition, drying of the slag prior to separation in the presence of a reducing gas increases its magnetic susceptibility.When conducting a search of the patent and scientific and technical information was not found solutions containing a set of proposed features that allows us to conclude that the criterion of "novelty" and "inventive step".The proposed method is as follows. Granulated slag Nickel production serves on the plot, where they perform drying in the environment of a reducing gas, after which make a separation into fractions, for example, by screening. Get slag fractions +2, -2 - +0.4 and-0.4, and the fraction of -2 to +0.4 and-0.4 mm separate streams directed to magnetic separation to produce two types of concentrates, one of which contains 1% Nickel and 0.1% cob is, are environmentally friendly and can be either sent to the dump, or to serve as a product for the manufacture of concrete, abrasive powder etc.Example. Granulated slag after cooling in the water served in the drying unit, which direct gas-reducing agent, such as methane, and then sent to the classifier, namely dvuhmetrovoy rumble, where they perform the sieving into three fractions. Slag fractions of size -2 to +0.4 mm and -0,4 mm separately directed to magnetic separation, for example, by means of a separator PBSC - 90/60, and remaining on the sieve slag, and the slag after magnetic separation is directed either to the dump, or to use any known technology.Using the proposed method allows to obtain more expensive, more rich in metals 5% Nickel, 0.5% cobalt and 1% Nickel and 0.1% cobalt concentrates, thus avoiding surgery for crushing slag, used a cheaper and convenient way of fractionation - screening, which simplifies the method for processing granulated slag Nickel production and makes it profitable. In addition, the quality of the separation of slag on the magnetic and nonmagnetic fractions for improving Scheufele. Method for processing granulated slag dump Nickel production, including drying, separation of slag into fractions and subsequent magnetic separation, characterized in that the drying is carried out in the environment of a reducing gas, after which the slag is separated into three fractions: +2, -2-+0.4 and-0.4 mm and separately sephirot faction - 2 - +0.4 and-0.4 mm.
FIELD: nonferrous metallurgy.
SUBSTANCE: claimed method comprises combining slags using extraction principle with number of extractions n approaching infinity. Depleting agent efficient in presence of reducing agent is selected from materials enriched with pyrite, pyrrotine, calcium sulfide, and calcium sulfate; metal and alloys mainly containing Si, Al, Fe, C, etc. as well as reducing and sulfidizing complexes consisting of sulfides, oxides, and reducing substances (C, Me). Carbonaceous reducers, utilized individually or in mixture, are any known carbonaceous reducers. Degree of metal Me recovery is in accordance with conventional extraction equation.
EFFECT: increased degree of recovery of nickel from slags, reduced consumption of depleting agent, reduced power consumption and loss of sulfur into gas phase.
6 cl, 1 tbl
FIELD: converter process with use of oxygen lance.
SUBSTANCE: proposed method is used for converter processes such as AOD, MRP, AOD-L, MRP-L, CLU, ASM, Conars-Stainless steel, or vacuum processes such as VOD, SS-VOD, RH and RH with use of oxygen lance. Slag formed at the end of blowing and treatment in converter or vacuum plant is drained and removed in unreduced state; this slag is fed to electric furnace which is loaded with standard charge consisting of metal scrap and residual dust; then carbon is additionally fed and silicon if necessary; during melting, chromium oxide contained is slag is reduced by means of carbon and silicon.
EFFECT: low cost of process.
FIELD: extraction and regeneration of noble metals.
SUBSTANCE: method comprises steps of multiple crushing for producing at each step slag particles with successively decreased (from step to step) diameters; repeating crushing steps until producing particles with desired final size of their diameter; suspending crushed particles of slag in liquid medium after each crushing step; using slag produced after coal combustion in fire box or in boiler; performing steps of suspending for producing suspension with light and heavy particles, the last include noble metals; separating crushed particles in suspension on base of their mass and individually concentrating light particles and heavy particles; after each suspending step removing light particles from suspension for preparing suspension containing, mainly heavy particles; then trapping heavy particles for further crushing of them in order to produce desired final size of particle diameter.
EFFECT: enhanced efficiency, lowered cost of process.
10 cl, 2 dwg, 1 tbl, 1 ex
FIELD: nonferrous metallurgy.
SUBSTANCE: in order to reduce losses of cobalt and nickel with refuse slags and to increase recovery of valuable components into matte, charge containing sulfidizing agent, marble crumb (6-10%), and coke (15-25%) further contains 2 to 20% of aluminum-containing slag obtained in secondary aluminum processing.
EFFECT: reduced cobalt and nickel loss and lowered power and reagent consumption.
1 tbl, 2 ex
FIELD: ferrous metallurgy; preparation of samples of metallurgical slags for chemical analysis.
SUBSTANCE: proposed method includes grinding the slag sample, mixing and reducing sample mass which are performed at seven stages. First stage includes grinding the slag sample. Second, third, fourth, sixth and seventh stages includes grinding, mixing and reducing sample mass to required magnitude. Fifth stage includes drying and cooling the sample. Prior to first, second, third and fourth stages, metallic inclusions are manually removed. At fourth, sixth and seventh stages metallic inclusions are removed by screening in sieves between grinding operations.
EFFECT: improved quality of slag sample; enhanced accuracy of chemical analysis; reduction of time required for performing chemical analysis due to proper grinding of slag sample.
3 tbl, 1 ex
FIELD: processing vanadium-containing converter slag.
SUBSTANCE: proposed method includes roasting of slag with reaction additive, leaching-out cinder by soda solution for obtaining vanadate solution and separating vanadium oxide from it. At roasting, waste slag of vanadium process is introduced as reaction additive; waste slag contains hematite and manganese oxide at mole ratio of vanadium to manganese equal to 1:1. Roasting is performed at 800-850°C for 3 h; leaching-out is carried out with soda solution at mole ratio of V2O5:Na2CO3 equal to 1:1.2-1.8 including filtration of sodium vanadate solution and flushing the sediment with water. Vanadium and sodium are separated from solution thus obtained by electrochemical treatment in membrane system, sorption or neutralization by sulfuric acid followed by sedimentation of polyvanadium acid salts.
EFFECT: increased extraction of vanadium products; reduction of waste water disposal.
1 dwg, 8 tbl, 8 ex
FIELD: non-ferrous pyrometallurgy, in particular, small-scale or average-scale production of matte or metal with the use of mobile equipment in poorly settled regions with non-existent or weakly developed infrastructure.
SUBSTANCE: method involves melting with the use of oxygen-containing blast gas; converting; depleting slag in gasifier; reducing gases from melting process and converting with hot gases from gasifier. Oxygen-containing blast gas used is exhaust gas of energetic gas turbine unit operating on natural gas or gas generating gas from coal gasification. Gas used for gas turbine unit is gas generating gas from bath coal gasification produced on slag depletion. Flow line has melting bubbling furnace, converter, gasifier for slag depletion, gas turbine unit with system of gas discharge channel connected through branches with tuyeres of melting furnace, converter and gasifier. Each of said branches is equipped with pressure regulator and flow regulator.
EFFECT: reduced costs for performing method owing to employment of mobile equipment.
3 cl, 1 dwg, 1 ex
FIELD: nonferrous metallurgy; methods of conversion of the metallothermic slag.
SUBSTANCE: the invention is pertaining to the field of nonferrous metallurgy, in particular, to the metallothermic processes. The method of conversion of the metallothermic slag (4), especially of aluminothermic slag, silicothermic slag or their combinations is conducted in the process of reduction of the non-ferrous metals: V, Ni, Nb, Cr, Mo, Tt, Ti, W under action of the fluxes (5), which are added onto the surface of the metallothermic charge (2) prepared to be set on the fire before their own metallothermic reaction and-or after completion of the indicated reaction onto the surface of originated slag (4). At that there is a layer (6) of the reacted fluxes and slag. The originated layer (6) contains the fusible eutectics of the fluxes (5) and the slag. The fluxes (5) may be added onto the surface of the originated slag (4) after the metallothermic reaction within 20 minutes interval beginning from the indicated reaction completion, but predominantly within the limits of 5-10 minutes after completion of the indicated reaction. The fluxes(5) are added in the amount of 40 mass %, predominantly within the limits of 20-30 mass % in turms of the total mass of the metallothermic charge. The fluxes (5)are differ in sizes of the particles beginning from the size of the dust particle up to the maximum size of the grains of 100 mm and predominantly are within the limits of 10-30 mm. The fluxes (5) are batched on the surface of the metallothermic charge (2) and-or on the surface of the originated slag (4) simultaneously. The technical result of the invention is the change of the slag elemental composition so, that the slag is suitable for the further treatment without the losses of the metals.
EFFECT: the invention ensures the change of the slag elemental composition so, that the slag is suitable for the further treatment without the losses of the metals.
8 cl, 3 dwg, 5 ex
FIELD: metallurgy of nickel and cobalt.
SUBSTANCE: proposed method includes reducing-sulfidizing melting in heated unit in presence of sodium sulfate sulfidizing agent. Converter slag is leaned in any heated unit at temperature of from 1350°C to 1500°C. Sodium sulfate is introduced into melt in the amount of 10 to 12%; carbonic reductant is introduced in the amount of 13-15% of mass of slag being leaned. Viscosity of melt and mass of slag are reduced due to reduced melting point.
EFFECT: increased extraction of nickel and cobalt into sulfide melt.
3 tbl, 3 ex
SUBSTANCE: titania-containing blast-furnace slag processing comprises melting metallic substrate in melting chamber of melting unit, making substrate rotate by means of electromagnetic field generated by MHD-device of melting unit, forming parabolically shaped recess in the substrate, adding a portion of slag into recess, melting slag by electromagnetic energy transmitted to the slag through substrate, reducing metals, and melting them together with substrate metal. Reduction of titanium and other metals from their oxides having free energy lower than that of aluminum is effected in molten portions of slag with aluminum or ferroaluminum. These reduced metals contribute to metallic substrate. Thereupon, a fresh portion of slag is introduced into melting unit and titanium incorporated in the substrate reduces metals from their oxides contained in the fresh slag portion and having free energy lower than that of titanium. Titanium-reduced metals are melted together with metallic substrate and a predetermined amount thereof is poured out. The rest of metallic substrate is replenished with titanium reduced from slag phase with aluminum. Titanium-containing alloy is poured out from melting chamber in predetermined amount, after which, keeping alloy remaining in chamber rotating, all processed slag is discharged. After the notch is closed, rotation of the rest of alloy is stopped, metal plug is formed in the notch, and a fresh portion of slag is supplied in controlled mode while gradually forcing liquid metallic substrate to rotate in order to form parabolically shaped recess therein. From molten portion of slag, a portion of silicon is then reduced with titanium, after which all operations are repeated.
EFFECT: reduced power consumption and simplified process due to avoided need in cumbrous equipment for removal and treatment of gas.
6 cl, 1 dwg