Platinum group metal recycling technology

1. Method for recovering platinum in a nitric acid plant

The production of nitric acid of platinum, of palladium, rhodium alloy catalyst three yuan network, most of the production loss of the noble metal oxide is deposited ashes. Kunming Precious Metal Research Institute and Taiyuan Fertilizer Plant cooperated in research, the process is as follows: furnace ash→ iron capture reduction smelting→oxidation smelting→acid leaching→slag calcination→wet purification→platinum-palladium-ruthenium alloy powder. The direct yield of Pt, Pb and Rh was 83%, the total yield was 98%, and the product purity was 99.9%. The recycling process of the old platinum net is simple, and the waste net is dissolved, purified, reduced, and then the drawn wire mesh is woven, and the recovery rate is >99%.

Second, the recovery of platinum in the glass fiber industry

The Kunming Institute of Precious Metals proposed that the Pt, Rh, and Au alloy wastes should be deeply decomposed with aqua regia, and the sodium salt will be transferred to the sodium salt. The hydrogen peroxide will be used to reduce and separate the gold. The ion exchange will remove impurities, and the hydrazine hydrate will be pure Pt and Rh. The platinum rhodium product has a purity of 99% and a recovery of 99%. The Institute of Material Recycling and Utilization has proposed a process for recovering platinum ruthenium from waste refractory bricks and glass slag by using "dolomite-soda ash mixed sintering method". The waste refractory bricks are ball milled, melted, water-crushed, acid-soluble, filtered, and the filter residue is dissolved in aqua regia, and the nitrate is exchanged, and the hydrated hydrazine is reduced to obtain a platinum ruthenium product. The total yield of platinum rhodium is >99%, and the purity of the product is 99.95%. The institute combined with years of production practice to propose the combination of metallurgy and metallurgy to recover platinum ruthenium in waste refractory bricks, which reduces the cost, shortens the process and receives better results.

3. Recovery of platinum and palladium from spent catalyst

First, noble metal dissolution process, Kunming Institute of Precious Metals and Shanghai Petrochemical Plant high temperature calcination, hydrochloric acid leaching of oxide, zinc powder substitution, hydrochloric acid was added to dissolve the oxidizing agent, solid ammonium chloride Shen platinum, calcined to give pure platinum, a platinum purity of the product 99.9%, the recovery rate is 97.8%. Has applied for a Chinese patent. Second, the Institute of Materials Recycling and the Ministry of Nuclear Industry cooperated with the “all-melting method” for leaching, and the ion exchange adsorbed platinum (or palladium). The recovery of platinum was >98%. The yield of palladium was >97%. Product purity is >99.95%. Has applied for a Chinese patent and is used in several factories. Third, the Institute of Materials Recycling and Yangzi Petrochemical Co., Ltd. cooperated to study the recovery of palladium from spent palladium carbon catalyst. The spent catalyst is subjected to carbon burning, chlorination leaching, ammonia complexation, acidification and purification, and finally hydrazine hydrate reduction to obtain a purity of >99.95% sponge palladium, and a small amount of palladium in the waste liquid such as complex slag is adsorbed and recovered by the resin. The palladium recovery rate is >98%. Has applied for a Chinese patent.

Fourth, waste platinum, rhodium catalyst recovery

First, the Institute of Materials Recycling and Co., Ltd. cooperated with the Changling Refinery to adopt a "full-dissolution" leaching method, an ion exchange adsorption of platinum ruthenium, and a precipitating agent to separate platinum ruthenium. The platinum recovery rate is >98%, the ruthenium yield is >93%, the purity of the platinum ruthenium product is >99.95%, and the tail liquid aluminum sulfate can be used as the raw material for the production of catalyst. Second, Tsinghua University cooperates with Beijing Rare Metals Refinery. The platinum ruthenium in the spent catalyst is recovered by extraction. The spent catalyst is dissolved in 40% sulfuric acid, the hydrazine is extracted with 40% diisooctyl sulfoxide, the stripping solution produces potassium citrate, the sulfuric acid insoluble slag is burned to remove carbon, the acid is immersed in platinum, and the leaching platinum solution is 40%. The platinum is extracted by diisooctyl sulfoxide, and the counterplating solution is reduced by platinum. The extraction rate of platinum is >99%, the stripping rate is >99%, the platinum yield is >97%, the product platinum purity is 99.9%; the extraction rate of bismuth is >99%, and the rejection rate is >99%.

5. Separation and purification of platinum-rhodium alloy

Kunming Institute of Precious Metals proposed that: aluminum alloy for platinum-rhodium alloy “crushed, dilute aluminum with dilute hydrochloric acid to obtain fine platinum bismuth powder, dissolved with hydrochloric acid and oxidizing agent, extract and separate platinum ruthenium with trialkyl phosphine oxide, and purify and purify 铑. The purity is 99.99%, the recovery rate is 92~94%. The Chinese patent has been applied. Secondly, Chengdu 208 Factory introduced a set of platinum-ruthenium separation equipment from Japan, with a platinum yield of 98.5% and a ruthenium yield of 95%. >99.95.

Sixth, from osmium iridium alloy scrap purification osmium

The former China Materials Recycling Corporation East China Branch uses oxy-combustion to separate cesium, lye absorption of cerium oxide, sodium sulfide precipitation, sulfur removal, oxidization, hydrochloric acid absorption, ammonium chloride precipitation, hydrogen reduction, Take pure tantalum powder and the recovery rate is >98%. This method is suitable for waste containing 3% to 8%.

7. Recycling of niobium in nib grinding waste

East China Branch proposed to use the flotation method to recover the tip grinding waste containing 0.4%~1% of niobium. Sodium oleate is a flotation agent, and 2# oil is a foaming agent, an acidic medium. The obtained concentrate contains 5%>5%, tailings contain 0.2<0.2%, and 钌 recovery rate>90%.

8. Recovery of palladium and copper from spent catalyst slag

First, the material recycling research institute uses Hcl-H2O2 two-stage countercurrent leaching, and the xanthate precipitation enrichment palladium and copper separation method recovers copper and palladium from waste catalyst sludge containing Pd 0.8% and Cu 26.2%. The recovery rate was Pd>98% and Cu>95% [20]. Second, the Shenyang Institute of Mining and Metallurgy uses dilute Hcl immersion copper, iron to replace copper, leaching slag oxidative roasting, dilute king water leaching, zinc powder replacement, crude palladium dichlorodiamine palladium purification, palladium purity 99.99%. The recovery rate was >98% and the copper yield was 92%.

1. Product name: Sanitary Sight Glass
2. Seal Ring : Silicon, EPDM, FPM etc.
3. Glass: Boronizing silicon glass/toughened glass
4. Material quality: AISI304, AISI316L
5. Standard: DIN/SMS/ISO/3A/IDF
6. Specification: 1/2"-4", DN25-DN100,larger size can be customized
7. Structure: Straightway, cross(cross Pipe Fittings sight glass, cross ball type sight glass), one way model(welding sight glass/union sight glass)
8. Surface treatment: Straightway sight glass surface cutting: Ra1.6-3.2um
Inside surface treatment Ra≤ 0.4um
Outside surface treatment Ra≤ 0.8um
9. Application: Pharmacy, beer, food, dairy, beverage, cosmetic, chemical industry