Method for collecting tungsten compounds
A technology of tungsten compound and recycling method, which is applied in the direction of chemical instruments and methods, solid waste removal, water pollutants, etc., and can solve the problems of limited application and lower quality of recycled materials
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[0031] Hereinafter, as the first embodiment of the present invention, based on figure 1 , specifically explain the method of recovering tungsten oxide from super cemented carbide scrap. The so-called cemented carbide scrap refers to hard waste such as scrap generated during the manufacturing process of cemented carbide tools using metal tungsten or tungsten carbide (WC) as the main component, or used tools. , Powdery soft waste such as grinding waste can also be mentioned. Generally speaking, superhard tools use composite carbides such as metal tungsten or tungsten carbide as the main body, iron, nickel, cobalt, copper, etc. as the binding phase and contain TiC, TaC, NbC, VC, Cr as required 3 C 2 etc. as additive components of superhard alloys, specifically, cutting tools (blades, drills, end mills, etc.), metal molds (forming rolls, forming dies, etc.), tools for civil engineering and mining (for oil excavation) tools, rock crushing tools, etc.), etc.
[0032] First, the...
no. 2 approach
[0045] Next, as the second embodiment of the present invention, based on figure 2 , specifically explain the method of recovering tungsten oxide from super cemented carbide scrap.
[0046] A point that is very different from the first embodiment lies in the recovery and reuse of the introduced microorganisms. First, as in the first embodiment, the metal components of the cemented carbide scrap are dissolved in an alkaline solution to obtain a tungsten compound solution in which tungsten compound ions are dissolved, and microorganisms such as the above-mentioned bacteria or yeast are put into the solution, and the The tungsten compound solution into which the microorganisms have been introduced is adjusted to acidity with hydrochloric acid or the like, and the tungsten compound ions are adsorbed on the surface of the microorganisms (adsorption step).
[0047] Then, the microorganisms having adsorbed tungsten compound ions are dehydrated and impurities are removed by centrifug...
Embodiment 1
[0052] The used cutting inserts made of cemented carbide were pulverized and oxidized and roasted, and the oxidized and roasted calcined product was dissolved in an alkali solution (NaOH aqueous solution) to obtain a tungsten compound containing tungsten ion at a concentration of Table 1. solution. This tungsten compound-containing solution was adjusted to the temperature and pH in Table 1, and E.coli with the concentration in Table 1 was added in the form of addition in Table 1, and the solution was stirred.
[0053] Measure the concentration of tungsten in the solution 3 minutes and 60 minutes after the introduction of E.coli, and calculate the ratio of the decrease in the concentration of tungsten in the solution before introduction of microorganisms (tungsten concentration in solution before introduction of microorganisms - concentration of tungsten in solution after introduction of microorganisms The concentration of tungsten in the solution) / the concentration of tungsten...
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