Abstract: The present disclosure provides a method for in-situ synthesizing tungsten carbide powder. In this method, cemented carbide scrap is used as an electrode and the molten salt electrolysis process is used to in-situ synthesize tungsten carbide powder, where a bidirectional pulse is used in the molten salt electrolysis process. In the method provided by the present disclosure, by using the bidirectional pulse and using the cemented carbide scrap as electrode in the molten salt medium, when the tungsten carbide scrap is oxidized, tungsten is dissolved in ionic form, deposited after the direction of current changes, and reacted with the carbon anode sludge in situ to generate tungsten carbide powder.

Abstract: Provided herein is a method for separating Loran sky and ground waves based on a Levenberg-Marquart algorithm, including: (1) collecting a plurality of Loran sky-ground wave signals followed by normalization to obtain a normalized signal; (2) preprocessing the normalized signal by inverse Fourier transform method to obtain an initialization parameter; (3) establishing a mathematical model for the Loran sky-ground wave signals in time domain; and (4) solving parameters of the mathematical model using the Levenberg-Marquart algorithm to separate the Loran sky and ground waves.

Abstract: A method for separating nickel and cobalt from a solution includes the steps of: obtaining a solution containing nickel and cobalt by acid leaching of a cathode material of a waste lithium-ion battery, adjusting the pH of the solution containing nickel and cobalt to 3.5 to 4.5, adding extractants for extraction to separate the nickel and the cobalt. The cobalt enters the organic phase, the nickel remains in the aqueous phase, and the extractants contain an acidic extractant and an alkaline extractant. The method for efficiently separating nickel and cobalt through extraction adopts a non-saponification extraction method without using NaOH as a saponifier, thereby avoiding the discharge of saponification wastewater. Under acidic conditions, the cobalt in an acidic leaching solution is effectively extracted and separated into the organic phase through synergistic action of the acidic extractant and the alkaline extractant, thereby realizing the separation of nickel from cobalt.

Abstract: A method for separating nickel and cobalt from a solution includes the steps of: obtaining a solution containing nickel and cobalt by acid leaching of a cathode material of a waste lithium-ion battery, adjusting the pH of the solution containing nickel and cobalt to 3.5 to 4.5, adding extractants for extraction to separate the nickel and the cobalt. The cobalt enters the organic phase, the nickel remains in the aqueous phase, and the extractants contain an acidic extractant and an alkaline extractant. The method for efficiently separating nickel and cobalt through extraction adopts a non-saponification extraction method without using NaOH as a saponifier, thereby avoiding the discharge of saponification wastewater. Under acidic conditions, the cobalt in an acidic leaching solution is effectively extracted and separated into the organic phase through synergistic action of the acidic extractant and the alkaline extractant, thereby realizing the separation of nickel from cobalt.

Abstract: The present invention provides a process for recycling waste carbide, wherein the waste carbide is directly used as anode and electrolyzed in the molten salt, comprising the following steps: 1) the vacuum dehydrating of the molten salt electrolyte; 2) electrolyzing the waste carbide, which is used as anode, and an inert electrode, which is used as cathode in the molten salt electrolyte with the electrolysis temperature of 350˜1000° C.; 3) separating and collecting the metal powder obtained by electrolysis from molten salt medium. According to the technical solutions of the present invention, tungsten and cobalt ions can be dissolved from the anode material-waste carbide directly into the molten salt medium and deposited on the cathode plate with being driven by the electrolysis voltage, to obtain the metal powder particles. The tungsten, cobalt and other products obtained by electrolysis can be used as carbide materials, high temperature structural materials, weapons materials, photocatalytic materials, etc.

Abstract: The present invention relates to a process for efficiently enriching and recovering noble metals of platinum and palladium based on solvent extraction, wherein isoamyl alcohol is used as extracting agent and 2-methoxyphenyl thiourea is used as extraction-assisted complexing agent. 2-methoxy-phenyl thiourea is added to aqueous phase to react with platinum and palladium, and isoamyl alcohol is used as extracting agent to extract the organic phase, thus realizing the purpose of separating and extracting noble metals from base metals while enriching noble metals of platinum and palladium. The present invention, which can not only realize the separation of noble metals and base metals, but also enhance the enrichment and recovery ratios of noble metals of platinum and palladium, with low cost reagents, small influence on the environment and simple technical process, thus is a new and efficient extraction and enrichment system for noble metals.

Abstract: The present invention provides a process for recycling waste carbide, wherein the waste carbide is directly used as anode and electrolyzed in the molten salt, comprising the following steps: 1) the vacuum dehydrating of the molten salt electrolyte; 2) electrolyzing the waste carbide, which is used as anode, and an inert electrode, which is used as cathode in the molten salt electrolyte with the electrolysis temperature of 350˜1000° C.; 3) separating and collecting the metal powder obtained by electrolysis from molten salt medium. According to the technical solutions of the present invention, tungsten and cobalt ions can be dissolved from the anode material-waste carbide directly into the molten salt medium and deposited on the cathode plate with being driven by the electrolysis voltage, to obtain the metal powder particles. The tungsten, cobalt and other products obtained by electrolysis can be used as carbide materials, high temperature structural materials, weapons materials, photocatalytic materials, etc.

Abstract: The present invention relates to a process for efficiently enriching and recovering noble metals of platinum and palladium based on solvent extraction, wherein isoamyl alcohol is used as extracting agent and 2-methoxyphenyl thiourea is used as extraction-assisted complexing agent. 2-methoxy-phenyl thiourea is added to aqueous phase to react with platinum and palladium, and isoamyl alcohol is used as extracting agent to extract the organic phase, thus realizing the purpose of separating and extracting noble metals from base metals while enriching noble metals of platinum and palladium. The present invention, which can not only realize the separation of noble metals and base metals, but also enhance the enrichment and recovery ratios of noble metals of platinum and palladium, with low cost reagents, small influence on the environment and simple technical process, thus is a new and efficient extraction and enrichment system for noble metals.