425 results about "Lead sulfide" patented technology

The invention discloses a lead and zinc flotation method to ferreous blende and pyrrhotite typed complex lead zinc silver sulphide ore, mainly comprising lead ore branch flotation which controls the electrochemical conditions of the flotation and the zinc and sulfur flotation separation which controls the electrochemical conditions of the flotation. The invention has the advantages of implementing the lead-zinc sulfur separation by adopting twice branch flotation, carrying out fast flotation to the lead ore by using a novel composite catching agent to the galena and silver ore with easy floating coarse grains under the conditions of higher ore pulp potential and low pH; the normal flotation of the lead ore with difficultly floated fine grains is carried out under the conditions of lower ore pulp potential and high pH. The pH of the ore pulp is adjusted to more than 12 by lime for the gangue after the lead is floated; the iron blende is activated by bluestone; the iron blende is recovered by the catching agent with the same type of the lead sulfide floatation, thus leading the property of the lead flotation waste water to be basically consistent with that of the zinc flotation waste water and being beneficial for the circular application of floatation waste water.

The invention discloses the application processes and the preparation methods of a sulphide ore flotation collector as well as a diacyl bis-thiourea. The invention relates to a novel collector used for high efficiently recycling valuable sulfide minerals from metal sulphide ores; the compositions of the sulphide ore flotation collector include diacyl bis-thiourea surface active agents; the diacyl bis-thiourea compound is shown in the constitutional formula (1) or (2). The collector has strong collecting ability to copper sulphide minerals such as chalcopyrite, etc., lead sulfide minerals or zinc sulfide minerals activated by copper ions, nickel sulfide minerals as well as noble metal minerals such as gold, silver, etc., and has good selectivity to gangue sulphide minerals such as iron pyrites, pyrrhotite, etc., thereby realizing the high efficient flotation separation of the copper sulphide minerals and ferric sulfide minerals when the pH value of ore magma is below 11, reducing the used amount of lime, and improving the comprehensive recovery of copper sulphide ores.

The invention discloses a diester-based 2-thiocyanate ester derivate applied in sulphide flotation, and the preparation method thereof. Diester-based 2-thiourea (the formula one) or diester-based 2-ethionine ester (the formula two) is applied as a novel collector for high efficiently recycling valuable sulfide minerals from metal sulphide ores by floatation. The collector has wide pH range in ore magma, thereby having strong ability to collect copper sulphide minerals such as chalcopyrite, etc., lead sulfide minerals or zinc sulfide minerals activated by copper ions, nickel sulfide minerals as well as noble metal minerals such as gold, silver, etc., and having good selectivity to gangue sulphide minerals such as iron pyrites, pyrrhotite, etc.

In an example of a method for recovering lead from a lead material including lead sulfide, methane sulfonic acid is selected as a leaching acid for the lead material. The lead material is exposed to a solution including the methane sulfonic acid and i) ferric methane sulfonate or ii) oxygen, which leaches lead from the lead sulfide in the lead material, and generates a liquid leachate including a lead-methane sulfonate salt. The liquid leachate is purified, and lead is recovered from the purified liquid leachate using electrolysis.

The invention relates to a biological ceramisite filter material made of vulcanized lead zinc ore flotation tailings. The material is characterized by being prepared from 80-90wt% of vulcanized lead zinc ore flotation tailings, 8-18wt% of clay, 1.5-2.5wt% of pore former and an additional bonder, wherein the pore former is sawdust, bamboo scraps or straws, the bonder is lignin calcium xanthate, sodium carbonate or sodium silicate liquid, and the solid-to-liquid ratio of materials used by the biological ceramisite filter material is (8-12):1. The preparation method comprises the following steps of: weighing based on proportion of main and auxiliary materials; drying; mixing; forming; drying; preheating; roasting; and cooling to prepare a biological ceramisite filter material product made of the vulcanized lead zinc ore flotation tailings. The preparation method is simple and convenient to implement, free from secondary pollution, practical and reliable. The biological ceramisite filter material made of the vulcanized lead zinc ore flotation tailings provided by the invention has the advantages of turning ore waste residue into wealth and greatly lowering the cost of materials, so that the biological ceramisite filter material is a high-quality water treatment agent.

The invention discloses a Spiro-OMeTAD/PbS composite hole transport layer based perovskite solar cell and a preparation method therefor. The perovskite solar cell comprises a transparent conductive substrate, an oxide electron transport layer, a perovskite solar light absorption layer, the Spiro-OMeTAD/PbS composite hole transport layer and a metal electrode. The perovskite thin film solar cell adopts a simple process; a lead sulfide thin film can be prepared by a large-area evaporation method; and the lead sulfide thin film can be inserted between the Spiro-OMeTAD and the metal electrode layer to be used as a buffer layer. The Spiro-OMeTAD/PbS composite hole transport layer based perovskite solar cell achieves a high photoelectric conversion efficiency which is as high as 15.11%; the lead sulfide, which is used as the buffer layer between the hole transport layer and the metal electrode, has higher hole mobility, and higher humidity stability and light and heat stability, so that the recombination of electron-hole pairs can be reduced; meanwhile, the stability of the cell can be improved; compared with other buffer layer materials, the lead sulfide can protect a device and improve the performance of the device as well; and therefore, a positive promotion effect is realized on the industrial development of the solar cell.

The invention relates to non-ferrous metal metallurgy technology, in particular to the pyrometallurgy technology of lead sulfide concentrate. The process method is to successively carry out three smelting processes of oxidation smelting, reduction smelting and fuming volatilization in the same metallurgical furnace to smelt lead sulfide concentrate, and smelt crude lead, zinc fume and discardable slag in one step. In the oxidation smelting stage, after the feed reaches the set amount, the lead oxide slag is not released, and the high-temperature liquid slag is directly used in the furnace to transfer to the reduction stage of the lead oxide slag, and the smoke generated by oxidation smelting and reduction smelting is returned to the furnace for smelting. After the reduction is completed, all the crude lead is released, and the high-temperature liquid slag remains in the furnace, and it enters the slag fuming stage, and the zinc fume dust from the slag fuming is recovered and enters the next smelting cycle. The heat of the slag in the invention is fully utilized, and the energy-saving effect is obvious. The raw material preparation of the method is simple, the reducing agent only needs ordinary anthracite, and part of the fuel that needs to be supplemented in the reducing section and the fuming section is pulverized coal, which is low in value and easy to obtain.

The invention discloses a copper and lead separating cyanide-chrome-free beneficiation method for low-grade multi-metal sulfide ore. The beneficiation method is performed according to the following steps that (1) raw ore after ore grinding and grading enters the step of copper and lead bulk flotation to obtain copper and lead bulk concentrate and bulk flotation tailings, beneficiation reagents including 25# black powder and tetrabutyl ammonium black powder are adopted as collecting agents for copper and lead ore, and sodium sulfite and zinc sulfate are adopted as inhibitors of zinc ore; (2) copper and lead separating flotation is performed on the copper and lead bulk concentrate to obtain qualified copper concentrate and lead concentrate, in the copper and lead separating flotation process, activated carbon is adopted for reagent removal, and an inhibitor combined by sodium sulfite, sodium carboxymethyl cellulose and sodium humate serves as the inhibitor of lead sulfide ore. The beneficiation method has the following advantages of being low in price and production and application cost, it is unnecessary to perform special treatment on ore pulp, the process is easy to control, and technological and economic indexes are stable. The great defect that a dichromate titration method, a cyanide method and a less-cyanide-chrome technology can cause pollution to the environment is overcome, and the usage amount of beneficiation new water is greatly reduced.

The invention discloses a smelting method and device for molten oxidized lead slag. The smelting method comprises the following steps of: enabling high-lead slag melt obtained by oxidization and smelting of a lead sulfide concentrate melting pool to flow into a rectangular reduction furnace through a chute, spraying oxygen-enriched air into molten high-lead slag melt through air openings at two side walls of the rectangular reduction furnace, and adding coal granules or coke granules from a feeding port arranged at the top of the reduction furnace; under strong stirring of the oxygen-enrichedair, fully mixing the coal granules or the coke granules with the high-lead slag for reaction, realizing the cyclic operation of feeding, reduction, deslagging and refeeding of molten high-lead slag in the reduction furnace of the melting pool, heating and stirring a stagnant slag layer in the melting pool by a temperature rising port arranged at the side wall of the reduction furnace at a certain time interval, and after reduction, producing crude lead, flue gas, fume and reduced slag. The smelting method and device have the advantages that the flue-gas amount is less, and the energy-saving effect is obvious; and the amount of lead in the reduced slag is reduced and the recovery rate of the lead in the reduction process is high.

The invention discloses a method for synthetizing high-stability metal halide perovskite/lead sulfide heterostructure nanocrystals. The method comprises the following steps: firstly mixing lead halide with reactive solvent oleic acid, organic amine with long alkyl chains and octadecene in the presence of an inert gas so as to completely dissolve lead halide; then heating a mixed solution to 160-200 DEG C, rapidly injecting a caesium precursor, and reacting to generate CsPbX3; cooling to room temperature, then sequentially injecting a sulphur precursor and a lead precursor, and stirring for reaction, thereby finally obtaining the CsPbX3/PbS heterostructure nanocrystals. The synthetized CsPbX3/PbS heterostructure nanocrystals are uniform in appearance; the synthesis method is simple; due to epitaxial growth of lead sulfide, the perovskite performance stability is improved, and the CsPbX3/PbS heterostructure nanocrystals are enhanced in light-emitting efficiency and are beneficial to later-stage photoelectric device assembly.

Natural biopolymers in the form of cellulose nanocrystals (CNC) are shown to have the required characteristics to serve as chemically reactive biotemplates for metallic and semiconductor nanomaterial synthesis. Silver (Ag), gold (Au), copper (Cu) and platinum (Pt), cadmium sulfide (CdS), zinc sulfide (ZnS) and lead sulfide (PbS) nanoparticles, nanoparticle chains and nanowires may be synthesized on CNCs by exposing metallic precursor salts to a cationic surfactant, cetyltrimethylammonium bromide (CTAB), and a reducing agent. The nanoparticle density and particle size may be controlled by varying the concentration of CTAB, pH of the salt solution, as well as the reduction time or reaction time between the reducing agent and the metal precursor.

The invention provides a method for comprehensively recycling manganese, lead, silver and selenium from manganese anode slime. The method comprises the steps that firstly, the manganese anode slime, lead sulfide concentrate and ball milling liquid are mixed and subjected to wet-type ball milling; secondly, leaching of valuable metals such as manganese and selenium is conducted, leachate is reserved, and leached residues serve as lead smelting raw materials for recycling lead and silver; thirdly, a calcium-magnesium removing agent is added for impurity removing; and fourthly, a neutralizer, namely, ammonium hydroxide, and ammonium sulfate are added, a cleaning agent, namely, sodium dimethyl dithiocarbamate is dropwise added, and after stewing is conducted, activated carbon is added for adsorption, filter pressing is conducted, an electrolyzing additive is dropwise added into filtrate, and electrolytic manganese metal is prepared through electrolyzation. The method is small in investment, simple in technology, low in cost and capable of effectively increasing the comprehensive recovery rate.

The invention discloses a method for preparing a polyferric chloride flocculant by using steel wire rope sludge and waste salt. According to the method, the steel wire rope pickling sludge is dissolved in waste hydrochloric acid, lead ions in the dissolved solution are removed with a sulfide precipitation method, and the polyferric chloride flocculant is obtained; produced hydrogen sulfide gas meets the national odor pollutant emission standard after being subjected to falling-film absorption, packed tower absorption and activated carbon adsorption treatment, and meanwhile, whole-process sulfur element recycling is realized; cement is added to sludge residues for curing, and heavy metals are cured and stabilized. With the adoption of the method, the recovery rate of iron in the sludge is higher than 90%, the produced polyferric chloride flocculant has excellent performance in purification of domestic sewage, and produced lead sulfide meets the industrial purity requirement and can be used as an industrial raw material. With the adoption of the method, harmless disposal and resource utilization of the steel wire rope pickling sludge and the waste hydrochloric acid are realized simultaneously.

The invention discloses a continuous lead smelting clean production process. The process comprises the following steps of: proportioning materials such as lead sulfide concentrate or a secondary lead raw material, a flux, lead dust and the like as required; performing a mixed granulation process; feeding a reaction smelting section of the entire equipment; smelting by an oxygen enriched bottom blowing method; directly feeding liquid-state high-lead slag into a reduction smelting section to perform reduction smelting so as to produce coarse lead; and directly feeding the reduced liquid-stage slag into a fuming section to perform fuming treatment so as to comprehensively recover valuable metals from the liquid-stage slag. Therefore, continuous clean production is realized in the true sense.

Provided is a beneficiation method for arsenic-containing lead sulfide ore. The method comprises the steps that 1, raw ore is ground; 2, ore powder obtained through grinding is subjected to flotation, one time of roughing, two times of scavenging and two times of concentration, so that lead concentrate is obtained; and 3, tailings obtained through scavenging are subjected to flotation grading including one time of roughing, one time of scavenging and one time of concentration, so that arsenic concentrate is obtained. Through the process grading, the lead grade of the lead concentrate is 66.30%, the lead recovery rate is 85.04%, the arsenic grade of the arsenic concentrate is 8.48%, and the arsenic recovery rate is 79.84%.

The invention provides a method for preparing lead sulfide thin films with (200) preferred orientation, which belongs to the technical field of electronic materials and relates to semiconductor optoelectronic thin films and infrared photoelectric detectors, in particular to a method for preparing the lead sulfide thin films with (200) preferred orientation of near-infrared photoelectric detectors by using chemical bath deposition. In the invention, the bicontinuous cubic phase lead sulfide thin films with (200) preferred orientation are obtained by using the chemical bath deposition, designing a preparation flow of solution of a reaction precursor, strictly controlling the initial nucleating process of the thin films and performing a subsequent high-temperature sensitizing process. The lead sulfide thin films prepared by the method have high uniformity and a light sensitive characteristic and can be used in the near-infrared photoelectric detectors. The invention has the advantages that: the whole preparation technical process is simple and easy to control; and the preparation device is simple and low in cost.

The invention discloses a method for synthesizing a lead sulfide (PbS) film through the chemical in-situ reaction of a solution. The method comprises the steps of: (1) preparing a precursor solution; (2) preparing the PbS film through carrying out an in-situ reaction: vertically immerging a deposition substrate, of which a lead precursor film is attached to the surface, into a sulfur source anionic precursor solution for carrying out an in-situ chemical reaction, after 10 seconds, pulling the deposition substrate out of the reaction solution at a uniform speed, washing the deposition substrate by using deionized water, then, placing the deposition substrate in a drying box so as to form a PbS reaction deposition layer; and (3) carrying out heat treatment. The invention provides a novel in-situ chemical synthesizing method for the PbS film with high efficiency, convenience, little pollution and low cost, low-toxicity chemical raw materials, such as inorganic salt which serves as a precursor, alcohol ether and alcohol amine which serve as solvents, and the like, are adopted, and the PbS film is synthesized at a lower temperature, so that method for synthesizing the PbS film through the chemical in-situ reaction of the solution has the advantages of good evenness in solution deposition reaction, high degree of crystallizing, and easiness for controlling the thickness of the film.

The invention relates to a lead sulfide-coated perovskite quantum dots-based electroluminescent LED and a preparation method. The electroluminescent LED comprises ITO glass as a bottom electrode, n-type ZnO/polyethyleneimine as an electron transport layer (ETL) and a hole blocking layer (HBL), PbS-coated perovskite quantum dots as a light-emitting layer, a p-type 4,4',4''-tris(carbazol-9-yl) aniline film as a hole transport layer (HTL) and an electron blocking layer (EBL), and MoO3/Au as a top electrode. The preparation method comprises the steps of firstly preparing a cesium oleic acid solution; preparing the PbS-coated CsPbI3 quantum dots, the electron transport layer, the hole blocking layer, the light-emitting layer, the hole transport layer and the electron blocking layer; and obtaining the PbS-coated perovskite quantum dots-based electroluminescent LED. By adopting the PbS-coated perovskite quantum dots, the photoelectric property of the perovskite quantum dots is improved, the stability of the quantum dots is ensured and good semiconductor performance of the quantum dots is kept at the same time, and the efficient and stable electroluminescent LED is prepared from the quantum dots as the light-emitting layer.

The invention discloses a novel friction material for a brake pad, which is prepared from the following raw material in parts by weight: 20-40 parts of aramid fiber, 10-30 parts of carbon fibers, 1-5 parts of red copper powder, 5-10 parts of aluminum powder, 1-5 parts of expanded iron powder, 1-5 parts of lead sulfide, 5-10 parts of calcined coke and 5-10 parts of artificial graphite. The novel friction material for the brake pad disclosed by the invention has the advantages of stable friction coefficient, low abrasion rate and good strength, and has the advantages of better impact-resisting strength, low product density, low hardness, low braking noises, no damages to braking antithesis and the like; and the service life is greatly prolonged.

The invention discloses a repair and maintenance type charging method of a lead-acid storage battery. The method comprises the following steps: a continuous and repeated constant-current restricted-voltage output process comprising constant current output, pause, discharging, pause, sweep frequency pulse output, pause, discharging and pause, a standing and stable process and a constant-voltage restricted-current complementary charging process. With adoption of the method disclosed by the invention, in the battery repair and charging process, lead sulfide crystals existing on a battery plate before repair can be broken and dissolved, three polarization phenomena including ohmic polarization, concentration polarization and electrochemical polarization and generated during charging or repair can be eliminated, formation of new lead sulfide crystals on the battery plate can be restrained, generation of high temperature of the lead-acid storage battery can be effectively prevented in repair and charging, time of repair or charging can be reduced, and the service life of the lead-acid storage battery can be prolonged; therefore, the maximum repair efficiency and the maximum capacitance of the lead-acid storage battery can be reached.

The invention belongs to the technical field of preparation of compound semiconductor nanomaterials and particularly relates to a preparation method of a monodisperse PbS quantum dot. The method comprises steps as follows: S1, a halide of lead and oleylamine are mixed, heated to 80-190 DEG C and fully stirred to form a lead precursor, and then the lead precursor is cooled to 20-35 DEG C; S2, thioacetamide and oleylamine are fully stirred at 20-35 DEG C to form a sulfur precursor; S3, the lead precursor and the sulfur precursor are mixed in the molar ratio of Pb and S being (2-5):1, heated to 60-90 DEG C and subjected to heat preservation for a certain period; S4, the solution after heat preservation in S3 is cooled to 20-35 DEG C, and oleic acid is added to remove the residual lead precursor; S5, the PbS quantum dot is obtained after separation and purification. The prepared PbS quantum dot has the characteristics of high crystallinity, size uniformity, oleic acid and halogen mixed passivation, efficient luminescence, high stability and the like.

The invention discloses a preparation method of an EVA/lead sulfide quantum dot composite packaging adhesive film material with a light converting function. The material is formed by compounding lead sulfide quantum dots and an EVA packaging adhesive film, wherein the lead sulfide quantum dots are lead sulfide nano-particles of which the sizes are 1 to 20 nm. The preparation method comprises the following steps: conducting surface treatment on the lead sulfide quantum dots under an ultrasonic condition; carrying out melt compounding between the treated lead sulfide quantum dots, and EVA, a cross-linking agent, an ultraviolet stabilizer, an anti-oxygen, a plasticizer and the like to prepare the EVA/lead sulfide quantum dot composite packaging adhesive film material with the light converting function. The material prepared according to the method can absorb ultraviolet light and emit visible light, so as to improve the ultraviolet light utilization ratio of a solar cell module, and further improve efficiency; moreover, the material prepared according to the method is longer in service life than a rare earth light converting material.