18results about How to "Improve direct yield" patented technology

The invention provides a process for comprehensively recovering valuable metals such as nickel, copper, gold, palladium and platinum and sulfur from hot filter residues, which comprises the following steps of: leaching copper, nickel and iron in the hot filter residues by adopting a high-pressure oxygen leaching process, and respectively recovering iron, copper and nickel in forms of ferric hydroxide, copper sulfide and nickel sulfide by adopting a manner of precipitating iron by adopting sodium hydroxide and precipitating copper and nickel by adopting sodium sulfide in a fractional manner; performing triple-effect crystallization on the generated wastewater to obtain pure sodium sulfate, drying leaching residues generated by high-pressure oxygen leaching, performing hot filtration to obtain crude sulfur and primary noble metal enriched residues, and performing low-pressure distillation on the primary noble metal enriched residues in a vacuum furnace to obtain crude sulfur and secondary noble metal enriched residues; and leaching gold, platinum and palladium in the secondary precious metal enrichment slag by adopting a hydrochloric acid chlorine method, returning the leaching slag to a vacuum distillation process, replacing and enriching precious metals in a leaching solution by adopting zinc powder, and carrying out triple-effect crystallization on generated wastewater after a conventional purification process to obtain a zinc chloride crystal product, so that comprehensive recovery of nickel, copper, gold, palladium, platinum and other valuable metals and sulfur is realized.

The invention discloses a method for recovering tin from tin arsenate slag and an ammonium chlorostannate substance, and the method comprises the following specific steps: firstly, mixing the tin arsenate slag with hydrochloric acid, and heating for acid leaching and dissolving to obtain an acid leaching solution rich in arsenic and tin; then adding a tin precipitator into the arsenic and tin acid leaching solution, and selectively and efficiently precipitating tin to realize separation of arsenic and tin; then, an arsenic reducing agent is added into the tin immersion post-solution, and pentavalent arsenic in the solution is reduced into trivalent arsenic; a vulcanizing agent is added into the reduced liquid, and most arsenic is removed through a vulcanization arsenic precipitation method; and finally, carrying out deep treatment on the arsenic-precipitated liquid. According to the method, efficient separation of arsenic and tin in the tin arsenate slag can be achieved, the direct recovery rate of tin can reach 90% or above, the arsenic content of the obtained ammonium chlorostannate tin deposition slag is lower than 1.0%, meanwhile, effective fixation of arsenic is achieved, and the method is environmentally friendly, easy to operate, low in production cost and capable of being used for industrial production.

The invention discloses a method for enriching precious metal from carbonylation alloy, which comprises the following steps: S1, adding the carbonylation alloy with the granularity of 1-3mm and 2.0-2.5 mol / L hydrochloric acid solution into a mechanical kettle according to the liquid-solid ratio of (4-5): 1, and sequentially adding the carbonylation alloy with the granularity of 1mm-3mm and 2.0-2.5 mol / L hydrochloric acid solution into the mechanical kettle according to the arriving position of feed liquid; s2, sulfating roasting: controlling the ratio of the slag subjected to electric chlorination washing to concentrated sulfuric acid to be 2: 1, adding the slag to a rotary kiln, dividing the rotary kiln into three temperature sections, taking a kiln head as a preheating and drying section, and controlling the temperature to be 250-40 DEG C; an acidification roasting section is arranged in the kiln, and the temperature is 500-600 DEG C; the kiln tail is a selenium steaming section, the temperature is 600-650 DEG C, and the material roasting time is 8-10 hours; and S3, water leaching is conducted, specifically, the materials obtained after sulfuric acid roasting and water are added into an enamel water leaching kettle according to the liquid-solid ratio of (4-5): 1, after the water leaching temperature is 80-93 DEG C and the water leaching time is 0.5 h, filter pressing separation is conducted, and residues serve as platinum concentrate to enter the next purification procedure.

The invention discloses a top-blown furnace and a smelting method adopting the top-blown furnace. The top-blown furnace comprises a top-blown furnace body and a top-blown furnace cover, wherein a feeding hole is formed in the side part of the top-blown furnace body; the blowing device comprises a blowing device body, a containing space is defined in the blowing device body, a first discharging opening is formed in the top of the blowing device body, a first air inlet is formed in the side portion of the blowing device body, a first discharging opening is formed in the bottom of the blowing device body, and a control valve is arranged at the first discharging opening; and the discharging pipeline is located below the blowing device body, the side wall of the discharging pipeline is provided with a second discharging opening, the second discharging opening is connected with the first discharging opening, one end of the discharging pipeline is provided with a second discharging opening, and the second discharging opening is connected with the feeding opening. According to the top-blown furnace, the material handling capacity can be increased, the direct recovery rate of products is improved, and the dust collection amount is reduced.

The present application relates to the technical field of metal rubidium preparation, and particularly relates to a preparation method of metal rubidium. The present application provides a preparation method of metal rubidium, comprising the following steps: drying rubidium chloride to obtain dried rubidium chloride; mixing the dried rubidium chloride with calcium, and performing compression molding to obtain a molded material; performing vacuum thermal reduction and fractional condensation on the molded material to obtain metal rubidium; and performing fractional condensation on the metal rubidium at a condensation interval of 40-200 DEG C to obtain metal rubidium. The preparation method has high direct yield and product purity of the obtained metal rubidium.

The application discloses a method for preparing lithium pre-doped amine coordination manganese iron phosphate precursor from lithium manganese iron phosphate, and belongs to the field of battery recycling. The method comprises the following steps: stirring and reacting lithium manganese iron phosphate battery material with a high-valence iron salt solution and a surfactant, and filtering to obtain filtrate and phosphorus iron residue; mixing the filtrate with a phosphate, adjusting the pH of the solution to 2-6, then mixing with an oxidizing agent A, and adding a mixed solution containing an organic amine compound to perform nucleation precipitation reaction, and aging to obtain the lithium pre-doped amine coordination manganese iron phosphate precursor. The application utilizes the surfactant and the high-valence iron salt to efficiently replace divalent iron under acid-free or weak acid conditions, generates a metal solution containing Li + , Fe 2+ , Mn 2+ , performs oxidation to form nucleation precipitation, adds an organic amine compound to control the morphology of the generated particles in the solution, generates the lithium-doped amine coordination manganese iron phosphate precursor, the reaction condition is mild, the energy consumption in the treatment process is low, and the economic utilization value of a manganese byproduct is improved.

The invention provides a preparation method of micro-powder-free cobalt hydroxide, belongs to the technical field of lithium ion battery material preparation, and solves the problems that the content of micro powder is high and the synthesis process is difficult to control when the cobalt hydroxide is prepared in the prior art. The method comprises the following operation steps: preparing a solution, carrying out a synthetic reaction, aging, washing, drying and the like, and synthesizing a crimson beta-type cobalt hydroxide product with a product index D0 greater than or equal to 3 microns and regular morphology by controlling the temperature of a synthetic raw material solution at-5 to + 5 DEG C and controlling proper synthesis conditions. The cobalt hydroxide prepared by the method is regular in microstructure, does not contain fine micro-powder particles, and can be used for preparing cobaltosic oxide required by high-voltage lithium cobalt oxide.

The invention discloses a method for extracting and refining platinum by using N-methylaminosulfonic acid. The method comprises the following steps: using N-methylaminosulfonic acid and di(2-ethylhexyl) phosphate to form an organic extraction phase; using a pulse sieve plate extraction tower device, feeding an organic phase from the bottom of the tower, feeding a feed liquid to be extracted from the top of the tower, performing stripping on the obtained platinum-carrying organic extraction phase, dripping diketoxime into the stripping liquid until no bright yellow precipitate is generated; adding ammonium chloride solid to the obtained platinum-containing stripping liquid, precipitating platinum to obtain ammonium chloroplatinate, and calcining to obtain a platinum product; using a pulse extraction column, which has the advantages of short equilibrium time and short feed liquid residence time, and using a new high-efficiency N-methylaminosulfonic acid extractant with synergistic effect, further improving the extraction rate and separation efficiency of platinum, and improving the stripping process compared with the existing process, solving the problem of low stripping efficiency; improving the direct recovery rate of platinum as a whole, shortening the process flow, and saving reagents, and can be applied to the extraction process of precious metal platinum.

The present application belongs to copper pyrometallurgy technical field, specifically discloses a kind of dynamic optimization method of double-side blowing copper smelting slag type based on molten pool working condition real-time monitoring and model driving.The method includes: real-time acquisition molten pool temperature, flue gas oxygen content, slag Fe3O4 Content and viscosity and other multiple key working condition parameters;Parameter is input into the preset control model, the expert rule based on metallurgical thermodynamics and production data is embedded in the model, and the dynamic adjustment amount of SiO2, CaO, MgO three kinds of slag forming agent is calculated accordingly;According to the adjustment amount, the proportion of slag forming agent is adjusted in real time;Periodic acquisition of slag sample analysis, compare measured value with model expected value, and feedback correction model parameters, realize closed-loop optimization.The present application can dynamically adjust slag type according to molten pool real-time working condition, reduce the fluctuation of slag fluidity by more than 40%, stabilize the copper content of slag below 1.5%, and improve the direct recovery rate of copper to more than 97.5%, significantly improve the process stability and metal recovery rate.

The present application belongs to the technical field of secondary resources recovery of noble metals, and provides a method for rhodium leaching based on hydrothermal strengthening and a composition for rhodium leaching, the method comprising: preparing a mixed slurry by mixing rhodium-containing materials, an oxidizing agent comprising cerium dioxide, a fluoride additive comprising an alkaline earth metal fluoride, a reducing agent comprising hydrochloric acid, and water; and then performing a hydrothermal reaction to obtain a leaching solution containing rhodium ions. By using specific oxidizing agents, fluoride additives, and hydrochloric acid, and combining with the hydrothermal reaction, the noble metal is effectively oxidized, and the efficient leaching of the noble metal rhodium can be realized, and the leaching solution containing noble metal ions can be obtained, and the enrichment and recovery of rhodium ions can be realized. The method provided by the present application does not need to be roasted or high-temperature treated, and is simple to operate, and only by strengthening the oxidation of rhodium under hydrothermal conditions, the oxidation reaction can be fully promoted, and the recovery rate of the noble metal can be effectively improved, which can reach more than 99.5%.

The present application belongs to the field of metallurgy, and discloses a method for removing arsenic, antimony and bismuth from crude copper, comprising the following steps: S1. Melting crude copper raw material to obtain molten copper liquid, and controlling the temperature of the molten copper liquid to be 1150-1250 DEG C; S2. Adding a slagging agent to the molten copper liquid, and introducing oxygen-containing gas to remove impurities from the molten copper liquid; first, maintaining the oxygen volume concentration at 0.1%-0.5%, adding a part of the slagging agent to react; then, increasing the oxygen volume concentration to 1.5%-3.0%, and adding the remaining slagging agent to react; wherein the slagging agent comprises an alkaline carbonate, an oxidizing agent and a crystal nucleus inducer; the oxidizing agent is sodium nitrate or / and potassium nitrate; S3. Allowing the molten copper liquid to be separated from the slag phase, and removing the slag to obtain refined copper liquid. The method can deeply remove arsenic, antimony and bismuth, and can reduce the amount of slag, and the slag system has good fluidity and is easy to separate, so that the copper purity is improved while the recovery rate is ensured.

A hydrometallurgy-flame metallurgy combined process for recovering valuable metals from copper soot, comprising the following steps: (1) low-temperature sulfuric acid roasting and dehalogenation: mixing copper smelting soot containing bromine and chlorine with concentrated sulfuric acid, and then performing low-temperature roasting to obtain roasting slag; (2) leaching and separation: adding the roasting slag into water, stirring and leaching, and then filtering to obtain tin, lead, gold and silver-containing leaching residue and copper and zinc-containing leaching solution; (3) reduction smelting: adding carbonaceous reducing agent into the tin, lead, gold and silver-containing leaching residue, and then performing reduction smelting to obtain gold and silver-containing lead-tin alloy product; and (4) leaching solution treatment: adding elemental zinc into the copper and zinc-containing leaching solution, performing zinc replacement, and then filtering to obtain sponge copper product and zinc replacement solution. The process can realize efficient removal of bromine and chlorine in copper smelting soot, reduce environmental pollution, realize efficient separation of tin from copper and zinc, has high tin direct recovery rate, has simple process route, has high metal recovery rate, and is suitable for industrial application.

The invention provides a hot-dip galvanized aluminum magnesium alloy smelting scum refiner which comprises the following components in percentage by mass: 25 to 30 percent of charcoal dust, 10 to 15 percent of ammonium chloride, 10 to 15 percent of cryolite, 10 to 15 percent of sodium chloride, 10 to 15 percent of zinc chloride, 5 to 10 percent of potassium chloride and 5 to 10 percent of magnesium chloride. The invention further provides a preparation method and a slagging method of the hot-dip galvanized aluminum magnesium alloy smelting scum refiner. According to the hot-dip galvanized aluminum magnesium alloy smelting dross refiner and the preparation method and slagging method thereof, dross generated in hot-dip galvanized aluminum magnesium alloy smelting can be fully dispersed and refined, and entrainment of particle metal in the dross can be reduced.

The invention discloses a complete device for continuously preparing elemental arsenic, which comprises a tray conveying roller way and a tray returning roller way, the tray conveying roller way sequentially penetrates through a material distribution area, a high-temperature roasting area, a water jacket cooling area and an unloading area, the tray returning roller way is arranged between the unloading area and the material distribution area, a feeding front chamber and a material distributor are arranged in the material distribution area, and the material distributor is arranged in the material distribution area. A feeding bin door is mounted at an outlet of a first charging tray of the front feeding chamber, and a distributing device is mounted behind the feeding bin door; the high-temperature roasting area is provided with a high-temperature hearth and a settlement collecting chamber, a steam outlet of the high-temperature hearth is communicated with an inlet of the settlement collecting chamber, and a tray outlet is communicated with the water jacket cooling area; a cooling water jacket is mounted in the water jacket cooling area, and the tray conveying roller way penetrates through the cooling water jacket; the discharging area is provided with a discharging chamber, and the discharging chamber is provided with a second charging tray inlet communicated with the output end of the charging tray conveying roller way and a second charging tray outlet communicated with the input end of the charging tray returning roller way. According to the method, totally-closed and full-automatic preparation of the simple substance arsenic is realized, the direct yield is high, and the method is environment-friendly.

The utility model discloses a water-free and oxygen-free casting device which comprises a casting chamber, a feeding pipe installed at the top of the casting chamber, a reacting furnace installed at the lower end of the feeding pipe, a mold installed on one side of the reacting furnace, an air return opening formed in the left side of the casting chamber, and a ventilation pipeline connected to the lower portion of the air return opening and leading to a draught fan and a purification column. The purification column is filled with a molecular sieve and a copper catalyst, and a ventilation pipeline from the purification column returns to the casting chamber through an air inlet in the right side of the casting chamber. Compared with the prior art, due to the fact that vacuum protection is adopted in the ingot casting process, an oxidation film is prevented from being generated in the metal ingot casting process, the process is safe and controllable, the automation degree is high, operation is convenient, the metal direct recovery rate is high, and pollution to the environment is avoided.

This invention discloses a method for preparing 4N ammonium permanganate from low-concentration rhenium-containing waste acid, which is divided into a crude refining stage and a refining stage. The crude refining stage includes a rhenium precipitation process, a leaching process, a hydrolysis process, an acidification process, an extraction process, a back-extraction process, and a crystallization process. The refining stage includes a crude ammonium permanganate dissolution process, an ion exchange process, an extraction process, a back-extraction process, a crystallization process, and a nitration-recrystallization process, ultimately obtaining ammonium permanganate with a purity of 99.99%. In the crude refining stage, this invention first prepares 4N ammonium permanganate from low-concentration rhenium-containing waste acid. Rhenium is efficiently and selectively enriched in concentrated waste acid to obtain a 1% grade rhenium precipitate. Then, a weak oxidation leaching process is used to remove impurities from the precipitate, followed by calcium hydroxide hydrolysis, acidification, high-efficiency extraction, back-extraction, and crystallization to obtain a crude ammonium perrhenate product with a grade of ≥99%. In the refining stage, the crude ammonium perrhenate is dissolved a second time, and a resin ion exchange, extraction, back-extraction, and crystallization process is used to obtain a refined ammonium perrhenate with a grade of ≥99.9%. Finally, a nitration-recrystallization process is used to remove impurities from the refined ammonium perrhenate to achieve a 4N grade quality.

The utility model discloses a vacuum evaporation tank which comprises a vacuum evaporation tank and a liquid supplementing mechanism, the liquid supplementing mechanism comprises a liquid supplementing tank and a pre-evaporation liquid tank, the liquid supplementing tank is connected with the top of the vacuum evaporation tank through a pipeline, and the pre-evaporation liquid tank is connected with the top of the liquid supplementing tank through a pipeline. The utility model eliminates the potential safety hazard that gas and liquid do not emerge from an observation port at the top of the evaporation kettle due to positive pressure in the evaporation tank during liquid supplementation, reduces the scaling, corrosion and perforation conditions of plate sheets of the plate heat exchanger, simultaneously reduces the cleaning work of dismounting and mounting the plate heat exchanger, reduces the labor capacity, and improves the working efficiency. The direct recovery rate of nickel sulfate is increased, the nickel content of acid wastewater is reduced, the steam utilization rate is increased, the evaporation efficiency is improved, and production is balanced and stable.

The invention relates to the field of precious metal refining. The invention particularly relates to a method for refining platinum by alkali-soluble potassium chloroplatinate. The invention relates to a method for refining platinum by alkali-soluble potassium chloroplatinate, which sequentially comprises the following steps of: A, adding KCl into a platinum solution, fully stirring, and washing a filter cake with potassium chloride and hydrochloric acid to obtain a K2PtCl6 filter cake; b, dissolving the K2PtCl6 filter cake obtained in the step A by using NaOH, cooling and filtering to obtain an alkali-soluble mother solution; c, adjusting the acidity of the alkali-soluble mother liquor obtained in the step B with hydrochloric acid, adding NH4Cl to precipitate platinum, fully stirring to generate (NH4) 2PtCl6 precipitate, filtering, and washing a filter cake with ammonium chloride to obtain ammonium chloroplatinate precipitate; and D, calcining the ammonium chloroplatinate obtained in the step C to obtain the sponge platinum with the purity of SM-Pt99.95. According to the method, potassium chloroplatinate is subjected to alkali dissolution, impurities are removed, ammonium chloroplatinate is precipitated, no nitrogen oxide tail gas is discharged in the refining process, and green and efficient refining and purification of platinum are achieved.