65 results about "Ammonium chloroplatinate" patented technology

The invention discloses a method for recovering valuable metals from a waste printed circuit board. The method comprises the following steps: sorting and crushing the printed circuit board, evenly mixing powder containing multiple metal parts with a fluxing agent, and smelting at low temperature for 1-3.5h; adding hot water into smelting products for leaching; evaporating and concentrating filtrate after filtration, and then returning evaporation mother liquor to the water leaching process step; using solution after leaching for swirl electrodeposition of metal silver, and adding 5-25% of HNO3 into filter residue for leaching; filtering the solution after electrodeposition, and adding 1-5 times of the weight of aqua regia into the filter residue for leaching; using the solution after leaching by the aqua regia for the swirl electrodeposition of gold, adding saturated NH4Cl into the solution after the electrodeposition for reaction, then filtering, using ammonium chloroplatinate for refining the filter residue, obtaining sponge platinum, adding methanoic acid into the solution after precipitation, and carrying out reaction for obtaining crude palladium powder. The method can extract copper, nickel, silver, gold, platinum, palladium and other main products and other by-products, realize the maximization of reutilization of value metal resources in the waste printed circuit board and solve the environmental pollution problem; and the adoption of the swirl electrolysis technology can realize low energy consumption, low reagent consumption, short process flow and simple operation.

A platinum refining technology comprises the steps of platinum family metal contained concentrate (slag, secondary resources and the like) chlorination dissolving, dissolved solution acidity adjustment, organic reducing agent ammonium oxalate precipitation, and precious metal filtering separation. The technology has the characteristics of wide material adaptability and simple operation, allows ammonium chloroplatinate of a platinum family metal contained material containing ammonium chloroplatinate to be efficiently and rapidly dissolved and precipitated, and allows the dissolving efficiency, the precipitation rate and the refining recovery efficiency to reach 95-99%, 99% and 90-95% respectively in the whole refining process; and compared with a traditional ammonium chloride repeated-precipitation method, the technology effectively solves a problem that nitrogen oxide cannot be discharged in a standard reaching mode, and eliminates the problems of large labor intensity of a aqua regia dissolved solution nitrate removing process and low production efficiency. The reducing agent ammonium oxalate is an organic reagent, and reacts to generate a pollution-free gas which can be directly discharged in the reaction process, so a solution system is not changed, thereby no influences on subsequent platinum precipitation by ammonium chloride are caused, and the yield and the quality of platinum family metal products are substantially improved.

The invention discloses a platinum refining process based on a two-stage sedimentation method. The platinum refining process comprises the following steps: (1), hydrazine hydrate reduction, wherein platinum concentrate is added with water for pulpifying and heating up to 50 DEG C+ / -5 DEG C, and hydrazine hydrate is added for reducing ammonium chloroplatinate into crude platinum; (2), aqua regia dissolving, wherein the filtered-out crude platinum is placed into a glass cup and added with water for pulpifying, and the aqua regia is added for dissolving until the platinum is completely dissolved; (3), first-stage non-oxidation platinum depositing-boiling to dissolve palladium, wherein liquor is controlled to contain 50g / l platinum, heated up to 60 DEG C, added with NH4C1 to deposit platinum, heated and boiled after the reaction is ended, and filtered and washed after being cooled; (4), second-stage oxidization platinum-palladium depositing, wherein the first-stage palladium-depositing filtrate is heated up to 60 DEG C, added with ammonium chloride and sodium chlorate in a ratio f 10:1 to deposit platinum and palladium, cooled, filtered and washed after the reaction is ended; (5), ammonifying and palladium dissolving, wherein the first-stage platinum salt and the second-stage platinum salt obtained by filtering are respectively pulpified by using pure water; (6), roasting, wherein the platinum salt placed in a porcelain crucible is heated and roasted in a muffle furnace, and taken out for being washed and dried after being slowly cooled.

A new method for purifying platinum through reduction relates to a process for purifying platinum from crude ammonium chloroplatinate through reduction. The method comprises the steps of: pulpifying the crude ammonium chloroplatinate and then heating, adding a saturated sodium hydrogen sulfite solution into the pulp under a thermal state to reduce and dissolve the crude ammonium chloroplatinate, and introducing chlorine after filtering to precipitate again. The purifying effect is achieved through repeated operation and spongy platinum which accords with the natural first-class standard is produced. The method provided by the invention has the advantages that the process is simple in flow and cost is low; less waste gas is discharged and is easy to treat; and waste liquid is low in acidity and is easy to recycle. By adoption of the process provided by the invention, the direct recovery rate of the platinum is 93% to 97%. By the method, the problems that the platinum settling efficiency is low, the waste gas amount is large, waste water is difficult to treat, the reduction efficiency is low and the reduction process is difficult to control in the traditional process of purifying the platinum through reduction are avoided; and environmental friendliness, high efficiency, simplicity and convenience of the process of purifying the platinum through reduction are realized.

The invention discloses a preparation method for tetraammineplatinum (II) acetate. The preparation method comprises the following steps: reacting ammonium chloroplatinate (IV) with oxalic acid, ammonia water and calcium acetate respectively in three steps to form a tetraammineplatinum (II) acetate solution; then subjecting the tetraammineplatinum (II) acetate solution to concentration and separation through solvent-out crystallization so as to obtain a tetraammineplatinum (II) acetate crystal; and performing vacuum drying so as to obtain tetraammineplatinum (II) acetate with a purity of no less than 99.95%. According to the invention, the starting material, i.e., the ammonium chloroplatinate (IV) is a conventional compound of platinum and is easy to obtain and high in yield, and the otherauxiliary materials consisting of oxalic acid, concentrated ammonia water and calcium acetate are cheap, so production cost is greatly lowered; in addition, the method avoids residues of chloride ionsand nitrate ions and lowers residual silver ions in the produced tetraammineplatinum (II) acetate. The preparation method of the invention is carried out under normal temperature and normal pressure,is simple to operation and easy to control, has high reaction yield (more than 92%) and high product purity (no less than 99.95%), and is applicable to batch and industrial production of tetraammineplatinum (II) acetate.

The invention discloses a SO4<2-> / ZrO2-Fe2O3-SiO2 doped mixed-crystal solid acid and a preparation method thereof. The preparation method comprises the following steps: (1) dropwisely adding ammonia in an aqueous solution of ZrOCl2, ammonium hexachloroiridate, cobaltous acetate and ammonium molybdate, then adding nano ferric oxide, dispersing, after a spacing interval of 1 hour, adding sodium fluosilicate, preserving the heat, standing, filtering, collecting precipitates, washing the precipitates and drying; and (2) dipping the product obtained by the step (1) in an ammonium chloroplatinate solution, then roasting, dipping the roasted article in a sulfuric acid solution, and then roasting again to obtain the SO4<2-> / ZrO2-Fe2O3-SiO2 doped mixed-crystal solid acid. According to the invention, the strength of the acid can be significantly raised, the acid site amount is stabilized and increased, the reuse effect is good, and the solid acid disclosed herein is an ideal acid catalyst for high-molecular polymerization, addition reaction, cracking reaction, esterification reaction, etherification reaction, etc.

The invention discloses a novel colored and fragrant firecracker which is prepared from the following components in parts by weight: 50-70 parts of potassium perchlorate, 1-3 parts of acetylene black, 5-9 parts of ammonium chloroplatinate, 8-15 parts of magnesium powder, 7-15 parts of aluminum powder, 5-10 parts of titanium white, 6-10 parts of iron powder, 5-15 parts of aged folium artemisiae argyi powder, 6-25 parts of Artemisia santonica powder, 8-16 parts of strontium carbonate, 2-6 parts of phenol formaldehyde resin, 2-6 parts of polyvinyl chloride, 4-12 parts of strontium nitrate, 9-30 parts of sulfur, 1-6 parts of shellac, 10-50 parts of barium nitrate, 10-50 parts of calcium nitrate, 2-5 parts of sodium nitrate, 0.5-1 part of rosin, 2-25 parts of antimony sulfide, 1-3 parts of vegetable oil and 15-35 parts of hard charcoal powder. The invention has the advantages of reasonable product formula, high safety performance and favorable explosion effect, and integrates fireworks and crackers; after the firecracker is ignited, the firecracker can generate dual effects of fireworks and crackers, has beautiful colors and fragrant smell, and can last for a long time.

The invention relates to a platinum purification method and a reaction kettle. The problem that in an existing platinum purification technology, the recovery rate of platinum and the purity of spongyplatinum are not easily balanced is solved. The platinum purification method comprises the following steps that a platinum ingot and base metal are mixed together, molten to form liquid gold and processed to form gold grains; the gold grains and aqua regia are added to a dissolution reaction kettle, stirred and heated to enable the gold grains to be dissolved, and dissolved platinum liquid is obtained; the dissolved platinum liquid is added to a separation reaction kettle, ammonium chloride is added, and stirring operation and heating operation are conducted so that platinum ions in a solutioncan be deposited to form ammonium chloroplatinate; residual liquid in the separation reaction kettle is filtered away, the deposited ammonium chloroplatinate is washed and filtered by an ammonium chloride solution; and a reducing agent and the washed deposited ammonium chloroplatinate are added to the separation reaction kettle, ammonium chloroplatinate is reduced, and the pure spongy platinum isobtained, specifically, the weight ratio of the content of platinum in the platinum ingot to ammonium chloride is 1:(1-1.7). The platinum purification method has the advantages of saving the cost andbeing high in platinum primary recovery rate and high in purity of the spongy platinum.

The invention relates to a platinum refining process. The platinum refining process comprises the following steps: (1) dissolving various platinum containing feed liquids and a coarse platinum ammonium salt, and performing filtration after brushing away acids and denitrating; (2) throwing the filtrate into a reaction kettle, introducing chlorine for hydrolyzing while raising the temperature, and stopping introducing chlorine when the potential is increased to over 1000mV; (3) adding a caustic soda liquid while stirring to adjust the pH value, and directly cooling and filtering the mixture when the pH=8-9 is stabilized for more than 5min, wherein the filtrate is orange; (4) returning acid from the filtrate, repeating the steps 2 and 3 three times, finally returning acid from post-hydrolyzed liquids obtained in three times to control the acidity of the feed liquids, adding a saturated ammonium chloride solution after boiling to precipitate platinum, and then cooling and filtering the mixture after boiling; and (5) calcining ammonium chloroplatinate obtained at 680 DEG C to obtain sponge platinum. The platinum refining process provided by the invention has the beneficial effects that 1, the production period is shortened by more than 40%; 2, denitrating is reduced by at least one time, so that the capacity is favorably enhanced and the environment is favorably improved; and 3, the direct yield of platinum is improved by 1.94%.