51 results about "Arsenic product" patented technology

The invention relates to a comprehensive recovery method for complicated materials containing arsenic and valuable metal slag dust, which comprises the following steps of: treating various arsenic-containing materials into a primary rotary kiln to volatilize the arsenic, and treating the materials into a secondary rotary kiln for purifying the arsenic to produce arsenic products containing 99.5 percent of As2O3; carrying out reduction melting on primary and secondary rotary kiln slag through a blast volatilization furnace, returning produced high-arsenic smoke dust back into the primary rotary kiln for treatment, using furnace slag as cement plant raw materials and zinc raw materials for carrying out resource treatment after the forced reduction arsenic removal and zinc volatilization through a fuming furnace, carrying out alkaline oxidation refining treatment on produced arsenic containing alloy, recovering lead, antimony, bismuth, silver and the like in the arsenic removal alloy according to the conventional method, carrying out crushing alkali dissolution and filtering on refined alkali slag with 5 to 15 percent of As2O3 and about 5 to 15 percent of valuable metal content, returning slag back into the blast volatilization furnace to be treated, introducing CO2 into tin and arsenic containing solution for precipitating the arsenic, using filtered stannic oxide as high-tin raw materials to be sold, carrying out arsenic precipitating and filtering through adding Ca(OH)2 into arsenic containing filter liquor, returning calcium arsenate slag back into the primary rotary kilnfor treatment after the filtration, and evaporating and concentrating the rest alkali liquid for recovering the alkali. The whole technical process of the method provided by the invention is simple and smooth, economic benefits and environment benefits are very obvious.

The invention discloses a combined extraction method for arsenic in high-arsenic manganese ore tailings, which is characterized by comprising the following steps of: dissolving arsenic minerals in the high-arsenic manganese ore tailings which have the arsenic grade weight of between 9 and 11 percent and serve as a raw material by an acid leaching-electrolysis-sublimation process combined process and a wet-type chemical leaching process, reducing arsenic in leachate to form simple substance arsenic by an electrolysis method, and purifying by a sublimation method further to obtain an arsenic product. By the method for extracting the arsenic, the recovery rate is high, the leaching rate of arsenic weight is more than or equal to 95 percent, the purity of the arsenic product weight is more than or equal to 80 percent, and the quality of the product is high; waste water of electroreduction operation returns the leaching operation to be recycled, so water for production is saved, and the environment is protected; leaching slag is processed by using alkali, and sublimation slag meets the discharge standard, so the method is environment-friendly, and has the good economic, social and ecological benefits. The method is suitable for producing high-purity arsenic products by arsenic ore tailings which are similar to fluorine-containing adelite CaMg(F / AsO4).

A method for synergistic arsenic fixation by hydrothermal reduction mineralization, adding ferrous sulfate to the arsenic-containing solution, adding sodium sulfide at a required pH value to precipitate arsenic sulfide-ferrous sulfide composite precipitate, the composite precipitate and reduction After the agent is mixed with water, it is added to the high-pressure reactor, and the temperature is controlled for a certain period of time to convert the composite precipitate into an arsenic-fixed product with a mineral crystal form, and finally achieve the purpose of reducing the dissolution toxicity of the arsenic-fixed product. The essence of the present invention is to realize the synergistic solidification of arsenic by using two processes of sulfide co-precipitation and hydrothermal reduction mineralization, so as to achieve the dual purposes of increasing the arsenic content in the arsenic-fixed product and reducing the toxicity of arsenic dissolution. The invention has the advantages of low dissolution toxicity, small quality of arsenic-fixed product, stable technical index and the like.