Chinese Academy of Sciences

Shanghai Yiding New Material Technology Co., Ltd

Tao Qi

Hui Zhang

Lina Wang

Yahui Liu

Hongxin Zhao

Desheng Chen

Yi Zhang

Jian Zhang

Huiquan Li

Zuohu Li

Zhikuan Wang

Weijing Wang

Zhaowu Zhu

Hongbin Xu

Xulong Dong

Daoyong Lin

Hongdong Yu

Tianyan Xue

Jingkui Qu

Lingyun Yi

Shili Zheng

The present disclosure relates to a method for lithium recovery by extraction-stripping separation and purification, including: (1) performing an extraction on a lithium-containing solution using an extraction system including a composite extractant at a pH in a range of 10-13 and separating to obtain a lithium-loaded organic phase; (2) subjecting the lithium-loaded organic phase obtained in step (1) to a gas-liquid-liquid three-phase stripping to obtain a lithium-loaded stripping solution; and (3) subjecting the stripping solution obtained in step (2) to a thermal treatment and separating to obtain a lithium product and a separated mother liquor.

Method for lithium recovery by extraction-stripping separation and purification

A method for cleanly extracting metallic silver includes: mixing an acidic solution containing Ceand NOwith a silver-containing material for leaching; after the leaching is completed, carrying out a solid-liquid separation to obtain a leaching solution containing Ceand Ag; and electrolyzing the leaching solution, wherein an oxidation reaction of Ceoccurs at an anode to realize a regeneration of Ceand an electrolytic reduction occurs at a cathode to reduce Agto obtain the metallic silver. Ceis used as a leaching agent and an intermediate oxidant to implement a cyclic operation of solution leaching and electrolytic regeneration on the silver-containing material. Almost no NOand waste liquid are caused by the extraction process, and the invention is clean and environmentally friendly.

Method for cleanly extracting metallic silver

A method for producing metallic silver by electro-deposition, including electrolyzing an electrolyte solution containing Ce(NO)in an anode zone and an electrolyte solution containing AgNOin a cathode zone by using an electrolytic cell with a specific diaphragm, wherein the electrolyte solution in the anode zone is not allowed to enter the cathode zone. After the electrolyzing is complete, the metallic silver with a high purity is obtained at the cathode, and a Ce-containing solution is obtained in the anode zone.

Method for producing metallic silver by electro-deposition

The present invention relates to a method for converting and separating vanadium, titanium, and iron from the vanadium-titanium-iron concentrate in one step, which includes the steps as below. (1) The vanadium-titanium-iron concentrate is mixed and roasted together with addition agent and reducing agent, and thereby vanadium-containing pig iron and vanadium enriched slag are obtained. (2) The vanadium titanium enriched slag is leached in water and filtered, and thereby vanadium-containing solution and titanium slag are obtained. The technical features of the present invention are as below. By the new process of sodium reduction coupling, a new system of low-temperature smelting multiphase reaction separation is constructed. The reduction of iron, sodiumizing of vanadium, and the melting separation process of the vanadium titanium enriched slag and the iron are achieved in one step. Three products, i.e., the vanadium-containing pig iron, the vanadium-containing solution, and the titanium slag are produced.

Method for converting and separating vanadium, titanium, and iron from vanadium-titanium-iron concentrate in one step

A method for processing vanadium-titanium magnetite finished ores by using a wet process. The method comprises the steps: extracting vanadium from vanadium-titanium magnetite finished ores and processing, by using the vanadium extraction method, obtained leaching residue by using a wet process, so as to obtain titanium; and calcining the remaining liquid extracted during the vanadium extraction, so as to prepare ferric oxide. The flow of the method is short, and the energy consumption is low, thereby avoiding waste of a titanium resource.

Method for processing vanadium-titanium magnetite finished ores by using wet process

This invention relates to a method for producing chromates, especially for producing alkali metal chromates. The method comprises following steps: the obtaining of a mixture of alkali metal hydroxide, alkali metal chromate, and ferrous residue after the reaction of chromite ore with an oxidant in the reactor in the presence of molten salt or in aqueous solution of alkali metal hydroxide, the obtaining of a leaching slurry by leaching the reaction products with aqueous solution of alkali metal hydroxide, the separating of the primary chromate product from the leaching slurry, the obtaining of pure chromate crystal by purifying the primary chromate product. Both the primary chromate product and the pure chromate crystal can be used as the raw materials to manufacture other chromium compounds. Compared with the currently-used roasting method, the method has the advantages of decreasing the reaction temperature by about 700&#xb0; C., of improving the chromium recovery rate up to nearly 100%, of minimizing the amount of the ferrous residue by not adding calcium-containing auxiliaries, and of completely eliminating the disposal problem of the chromium-containing residue and the environmental pollution due to the addition of calcium-containing auxiliaries, by using ferrous residue as the raw materials for other industries after extraction of magnesium.

Method for production of alkali metal chromates

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Beijing, China

Tao Qi