New method for extracting gallium from Bayer mother liquor through chelating resin

The invention relates to a method for regenerating ion exchange resin of a reverse osmosis rear secondary mixed bed The method is characterized by comprising the following regenerating steps of: 1) cleaning the ion exchange resin of the secondary mixed bed to be regenerated by using low-concentration alkali liquor so that the resin totally becomes invalid; 2) soaking the totally invalid resin into high-concentration alkali liquor; 3) performing a resin backwashing and demixing process, and cleaning the resin by using heat removal saline; and 4) finally regenerating the mixed bed in a normal regenerating order The method can effectively solve the common SiO2 deposition positioning problem of the secondary mixed bed in back of a reverse osmosis (RO) water treatment system, and is simple in operation and economic and valid; and the effluent water quality of the mixed bed can reach the standard requirements, the consumption of expensive resin can be reduced, and the effluent water quality can be improved

Method for regenerating ion exchange resin of reverse osmosis rear secondary mixed bed

The invention relates to a method for enriching gallium from a mother-liquor in a technology for producing alumina from high-alumina fly ash, and relates to the technical fields of solid waste comprehensive utilization and ion exchange. The metal gallium is obtained by taking a spent liquor with a low gallium concentration in the technology of producing alumina from the high-alumina fly ash as a raw material, employing technologies of ion exchange and process reinforcement, performing adsorption and elution to obtain a gallium enriching liquor, further processing and performing electrolysis. Aiming at the structure characteristics of gallium in the high-alumina fly ash, the method has the advantages of being high in enriching efficiency on low-concentration gallium solution, simple in producing technology, abundant in raw material source, and substantial in economical and environmental benefits.

Method for enriching gallium from mother-liquor in technology for producing alumina from high-alumina fly ash

The invention discloses a production method for high-purity aluminum oxide. The production method comprises the following steps of dissolving aluminum hydroxide produced in an aluminum oxide sintering production process to obtain a sodium aluminate solution, performing purification treatment, adding seed crystals, performing seed carbonization decomposition to prepare high-purity aluminum hydroxide, adding a sodium removal agent into the high-purity aluminum hydroxide, performing hydrothermal synthesis to obtain high-purity boehmite, and washing and roasting the boehmite to obtain the high-purity aluminum oxide, wherein a secondary purification flow for the sodium aluminate solution is added after the purification treatment, and a resin adsorption mode is adopted for the secondary purification flow. According to the production method, a conventional carbonization method for producing high-purity aluminum oxide powder is improved, elementary gallium metal difficult to remove by the conventional carbonization method is removed, and the purity of the high-purity aluminum oxide reaches more than 99.996 percent; and the production method is simple, easy, low in cost and free of environmental pollution.

Production method for high-purity aluminum oxide

The invention relates to a non-destructive gallium-extracting method of gallium-contained porcelain clay, comprising the following steps of: putting a porcelain clay sample in a crucible and then in a muffle to be activated at a constant temperature of 600 DEG C for 8h; cooling and packaging the porcelain clay sample with filter paper and putting in a sand tank and then in an extraction pipe of asorbite extraction device; adding 2/3 volume of a hydrochloric acid solution with the concentration of 6 mol/L in a flask, connecting with the sorbite extraction device, adding an anti-collapse belt between a condensing pipe and the flask; finally, adding a lithium bromide solution to a water bath boiler, communicating with condensing water; heating in a water bath at a temperature of 100 DEG C; extracting for 12h; firstly cooling to a room temperature after the primary extraction is finished; then, opening an extractor, taking out the sand tank, soaking the sand tank in pure water twice and finally taking out porcelain clay to be dried; repeatedly extracting the primarily extracted hydrochloric acid solution in the flask 10 times; and absorbing and desorbing after all extraction is fullyfinished. The invention has the advantage that the original functions of the porcelain clay after gallium extraction are utilized to realize the non-destructive gallium extraction from the gallium-contained porcelain clay.

Non-destructive gallium-extracting method of gallium-contained porcelain clay

The invention relates to a method for extracting gallium from alumina production flow. It adopts ISEP ion separation technique and adsorption gallium chelating resin. Its technology conditions are as follows: back flow adsorbing that liquor in Bayer process is processed by two stage series connection to make gallium concentration difference be 50-60 mg/L; back flow washing by 0.5-1N sodium hydroxide solution for the resin; back flow desorbing by 2-3N sodium hydroxide and 0.6-1.0N sodium sulfide solution; back flow rebirthing by 0.5-1N sodium hydroxide solution for the resin. It has the advantages of short flow, simple operation, little resin abrasion, high automation etc.

Guangsheng Liu

Papers

Method for extracting metallic gallium from aluminium oxide production procedure