31results about How to "Simultaneous recycling" patented technology

Disclosed is a device and process for fluorine recovery from smoke after phosphorus absorption by hydration in a kiln process for the production of phosphoric acid, wherein the device comprises a first-stage and second-stage fluorine absorption tower, which are both fluidised counter-current washing towers; the first-stage fluorine absorption tower mainly consists of a fluorosilicic acid washing pipe and a fluorosilicic acid separation tank; the top of the separation tank is provided with a smoke outlet, and at the bottom thereof a fluorosilicic acid liquid outlet is connected to the fluorosilicic acid washing pipe via a circulating and conveying pipeline; the main structure of the second-stage fluorine absorption tower is similar to that of the first-stage fluorine absorption tower, the top of the second-stage fluorosilicic acid separation tank is provided with a defoaming layer and a smoke outlet, and at the bottom thereof a fluorosilicic acid liquid outlet is in communication with a nozzle in the second-stage fluorosilicic acid washing pipe and the fluorosilicic acid separation tank in the first-stage fluorine absorption tower via a circulating and conveying pipeline. The fluorine recovery process of the present invention comprises multiple operations of a first-stage fluorine absorption, a first-stage gas-liquid separation, a second-stage fluorine absorption, and a second-stage gas-liquid separation etc. The present invention has the advantages of simple structure, low investment cost, high raw material utilisation rate, and good fluorine recovery effects etc.

The invention provides a method for preparing a positive electrode material precursor by using a waste ternary lithium battery, which adopts a first stage leaching as a pressurized ammonia leaching torealize simultaneous recovery of lithium, nickel and cobalt. The second stage leaching is atmospheric pressure acid leaching to realize the recovery of doped metal (manganese or aluminum). The invention realizes low cost of waste ternary positive electrode material, Short-process recovery and reuse, in which nickel is leached by ammonia under pressure, the comprehensive leaching rate of valuablemetals such as cobalt and lithium reaches 92%. The comprehensive recovery of valuable metals such as nickel, cobalt, lithium, manganese and aluminum is over 95% by two-stage leaching. Ammonia and leaching acid can be recycled in closed circuit. The precursor of ternary positive electrode materials prepared by regeneration can meet the needs of preparation of different series of ternary positive electrode materials, and has a good prospect of industrial application.

The invention discloses a synergistic extractant comprising a primary amine extractant and a pyridine carboxylate for extracting and separating tungsten from a molybdate solution. In addition, a method for deep tungsten removal by extraction from a tungsten-containing molybdate solution is disclosed; firstly, the pH value of the tungsten-containing molybdate solution is adjusted to 7.5-8.5, and then an acidified solution containing a synergistic extractant is combined with The organic phase is contacted for multi-stage extraction, and the detergent is an alkaline solution. During the multi-stage extraction process, tungsten is enriched in the loaded organic phase, and molybdenum is enriched in the raffinate to achieve deep tungsten removal in the molybdate solution. The loaded organic phase is back-extracted with an alkaline solution to obtain a tungsten-rich back-extraction solution. After the reaction, the organic phase was treated with an inorganic acid solution and then returned to extraction. The invention has good tungsten removal effect from the molybdate solution with high tungsten content, short process, low cost, and is easy to realize industrialization.

The invention relates to a method and device for producing high-pressure nitrogen and low-pressure oxygen. The high-pressure nitrogen and the low-pressure oxygen are simultaneously prepared by adopting three distillation towers comprising a high-pressure tower, a nitrogen tower and an oxygen tower. The high-pressure nitrogen is prepared in the nitrogen tower and the low-pressure oxygen is prepared in the oxygen tower. The method and device for producing the high-pressure nitrogen and the low-pressure oxygen can realize the simultaneous recycling of the pressure nitrogen and the pure oxygen, wherein the extraction rate of the pressure nitrogen ( wherein the oxygen content is less than 3ppm) reaches 75-80 percent, and the nitrogen pressure reaches 0.4-0.5MPa; the extraction rate of the pure oxygen (not less than 99.6 percent of O2) reaches 40-70 percent, the pressure reaches 0.02-0.05MPa; and the comprehensive electricity consumption of the oxygen and the nitrogen is only 0.18-0.2KWh / NM3(N2+O2), and the energy-saving effect is more remarkable.

The invention relates to a method and a device for producing pressure high-purity nitrogen and high-purity oxygen. The device comprises a high-pressure tower, a medium-pressure tower and an oxygen tower. A reboiler is arranged at the bottom of the oxygen tower; and liquid nitrogen and oxygen-enriched liquid air separated from the air in the high-pressure tower enter the medium-pressure tower to be separated into medium-pressure nitrogen and oxygen-enriched liquid in the high-pressure tower. A part of low-purity oxygen which is rich in methane and other high boiling point components is exhausted from the bottom of the medium-pressure tower; a low methane-containing oxygen-enriched liquid extraction opening is formed on the side of the medium-pressure tower; and the oxygen-enriched liquid enters into the oxygen tower for rectification, and the high-purity oxygen is extracted from a tower bottom or a plurality of tower plates on the upper part of the tower bottom. Compared with the priorart, the device and the method can realize simultaneous preparation of pressure nitrogen and high-purity oxygen, wherein the extraction ratio of the pressure nitrogen is 65 to 72 percent, the nitrogen pressure is 0.15 to 0.4 MPa, and the extraction ratio of the high-purity oxygen is 10 to 20 percent of the oxygen in air. The device can prepare low-cost protective gas pressure nitrogen for the float glass and other industries using pressure nitrogen, and can produce high additional value high-purity oxygen products.

The invention discloses a method for recovering valuable elements in waste lithium ion battery electrode materials. The method comprises steps of roasting the waste lithium ion battery electrode materials in an inert gas atmosphere, the roasting temperature is 200 -600 DEG C, the time is 30-360 minutes, and the roasting slag is obtained; mixing the obtained roasting slag and an acidic solution with [H+] concentration of 0.5~8 mol / L according to the mass ratio of 1:3~10; leaching at the leaching temperature of 30-90 DEG C and leaching time of 1-8 hours, leach liquor and leach residues are filtered to be obtained; the leach liquor is used for recovering nickel, cobalt, manganese, aluminum and lithium, and the leach residues are used for preparing negative electrode materials. According to the method for recovering valuable elements in waste lithium ion battery electrode materials, a leaching reducing agent does not need to be additionally added, the battery sorting and recycling costs are reduced, the positive and the negative electrode materials can be recovered at the same time, and the economic benefits of lithium battery recovery can be improved.

The invention belongs to the technical field of solid waste treatment in the metallurgical industry, and specifically discloses a resource recovery and treatment method for smelting wastewater sedimentation slag. In the method, the vanadium smelting wastewater precipitation slag is crushed and finely ground, mixed with sodium carbonate, and then roasted in a microwave environment for a short time to obtain a roasted slag, and then the roasted slag is subjected to ultrasonic rapid water immersion, and solid-liquid separation to obtain a leaching solution containing vanadium and molybdenum. The resource recovery and treatment method for smelting wastewater sediment slag provided by the present invention can separate vanadium and molybdenum elements at the same time, and has high recovery rate and high purity, and also effectively shortens the processing time of sediment slag, improves the processing capacity of sediment slag, not only It is beneficial to the harmless treatment of industrial solid waste, and also provides a new source of vanadium and molybdenum.