Barium resources in vanadium-titanium magnetite and their extraction
Stripping the alcohol as co-agent, scandium stripping at rt; washed using 0.4% HF scandium, zirconium, zirconium separation factor of βSc / Zr = 1893. Yang Zhi, who made use of kerosene was extracted P5709-N235- scandium, 5MHCl 60 ℃ stripping, can Sc 3+ and Fe 3+, Fe 2+, Ti 3+ , Al 3+, Mn 2+, Ca 2+ , etc. completely Separation solves the problems of Sc 3+ /Fe 3+ separation and slow phase separation. Hejin Lin et al mention when smoke from scandium chloride, extraction and separation using P204 Fe, Mn, NaOH stripping scandium enriched 83-fold; dissolved chemically purified using hydrochloric acid, concentrated hydrochloric acid and extracted TBP- separating scandium and RE Dowex50W-X8 exchange resin钪, the purity of Sc is >99.5%, and the yield is >56%. Sun Benliang et al. used an organic polybasic weak acid precipitant to precipitate hydrazine in the leaching solution of chlorinated soot hydrochloric acid. After two precipitations and two acid hydrolysiss, the removal rate of iron and manganese in the leaching solution was over 99.8%, and the precipitation rate of hydrazine was up to 100%; then P 2 O 4 + modifier + sulfonated kerosene as extractant, O / A = 1 / 20, extraction of cesium at room temperature, DSc up to 139, the separation coefficient of bismuth and iron, manganese reached 9270 and 10700; 5% NaOH back extraction, the stripping rate reached 99.6%. Lin Weiming et al. used benzylic acid to extract hydrazine, and the yield of hydrazine was 98.3%.
Extraction of strontium from selected titanium tailings
Panzhihua has been completed and the design size 13.5 million t / a of ore dressing plant, an annual output of 5.883 million tons of iron ore, with an annual output of 7,455,300 tons of tailings in urgent need of utilization. Zhang Zonghua tested the original ore of the iron ore plant at the time of the “Eighth Five-Year Plan†for the comprehensive evaluation of Panzhihua vanadium- titanium magnetite. The iron ore in the iron ore plant was 27.00g/t. Calculated according to the design scale, 364.25 tons of 钪 is recovered from the treated ore every year, and its value is 24.425 billion yuan. They scandium containing 63g / t Titanium tailings as raw materials, processing additives or pretreatment magnetic electric separation process can be divided into selected titanaugite tailings, feldspar, containing scandium, respectively 114g / t 121g/t; leaching with leaching solution with hydrochloric acid, the leaching rate can reach 93.64%; the leaching rate can be up to 97.90% by alkali fusion and hydrolysis of hydrochloric acid; the extraction rate can reach 98.90% by TBP extraction; The stripping rate is 98.00%; and then refined with oxalic acid to obtain a Sc 2 O 3 product with a grade of 99.95%, the market price is 36,000 yuan / kg. Due to the relatively high price and small market capacity, no factory has been built yet.
summary:
In summary, the bismuth in the titanium white mother liquor is in an ionic state, and the extraction process is simple, so the early production of cerium oxide is mostly used as a raw material; but the content of cerium is low (10-25 ppm), and is restricted by the production of titanium dioxide. (The annual output of 1000t titanium dioxide can recover dozens of kilograms of cerium oxide). The ruthenium in chlorinated soot exists in the form of ScCl 3 , and the recovery is not difficult. The question is whether the chlorinated soot is sufficient. It is assumed that the cerium oxide content is 500ppm on average. To obtain 50kg yttrium oxide product, at least 100t should be processed. Chlorinated soot, the amount of treatment is quite large. In the titanium tailings, the strontium is mainly present in the pyroxite of (Ca, Mg, Al, Ti)Si 2 O 6 silicate structure. The decomposition of tailings is difficult, and it is often acidified or alkalized at high temperature (~1000 ° C). Melting; however, the output of tailings is very large, and the absolute amount of strontium produced is considerable, providing sufficient raw materials for the production of strontium; however, the treatment of tailings must also take into account the comprehensive utilization of other resources.
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