A high-efficiency and energy-saving oxidation method for waste cemented carbide
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A cemented carbide, high-efficiency and energy-saving technology, applied in the field of metal materials, can solve the problems of high temperature, difficult crushing, long time consumption, etc., to achieve the effect of good quality, short process and long service life
Active Publication Date: 2018-08-24
JIANGXI UNIV OF SCI & TECH
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[0005] Aiming at the difficult problems such as difficult crushing, high temperature and long time consumption in the recovery and regeneration process of waste cemented carbide, the present invention provides a recycling method of waste cemented carbide which is easy to operate, low in energy consumption, high in recovery rate and wide in application range
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Embodiment 1
[0016] The tungsten-cobalt YG8 cemented carbide was subjected to 80 g.L -1 Sodium hydroxide, 30 g.L -1 Sodium carbonate and 60 g.L -1 After washing and drying the trisodium phosphate aqueous solution, take 5000g and place it in the calciner. 3 / h, 3.5m 3 / h, 7.0m 3 / h, 10.5m 3 / h, the speed of the furnace body is 2 r / min, 20 r / min, 40r / min, 60r / min, and the water injection speed is 0.1ml / min, 100ml / min, 200 ml / min, 300 ml / min calcination at 700°C, 800°C, 900°C, 1000°C, and calcination times of 0.5h, 2.5h, 4.5h, and 6.5h, respectively.
[0017] The oxidation percentage of cemented carbide obtained after medium and high temperature treatment is shown in Table 1:
[0018] Table 1 Oxidation effects of different oxidation processes
[0019]
[0020] From the data in the above table, it can be concluded that when the treatment temperature is lower than 700 °C, the waste cemented carbide cannot be completely oxidized, and when the treatment temperature is higher than 1000 °...
Embodiment 2
[0023] The tungsten-cobalt YG12 cemented carbide was subjected to 80 g.L -1 Sodium hydroxide, 30 g.L -1 Sodium carbonate and 60 g.L -1 After washing and drying the trisodium phosphate aqueous solution, take 5000g and place it in the calcination chamber, with a gas flow rate of 3.5m 3 / h, the rotational speed of the furnace body is 60 r / min, and the water injection speed is 200ml / min. Oxidize and calcinate at 1050 ˚C for 1h, and the cemented carbide is completely oxidized.
Embodiment 3
[0025] The tungsten-cobalt YG18 cemented carbide was subjected to 80 g.L -1 Sodium hydroxide, 30 g.L -1 Sodium carbonate and 60 g.L -1 After washing and drying the trisodium phosphate aqueous solution, take 5000g and place it in the calcination chamber, with a gas flow rate of 10.5m 3 / h, the rotational speed of the furnace body is 40 r / min, and the water injection speed is 300ml / min. The cemented carbide is completely oxidized at a temperature of 900 °C for 2 h.
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Abstract
The invention relates to a high-efficiency energy-saving oxidation method of a waste hard alloy. The method comprises the steps of sorting the waste WC-Co hard alloy according to differences of Co content, using aqueous solution which is prepared from sodium hydroxide with the concentration being 80g.L <-1>, , sodium carbonate with the concentration being 30g.L <-1> and trisodium phosphate with the concentration being 60g.L <-1> to remove impurities and oil on the surface of the waste WC-Co hard alloy at the temperature of 80 DEG C, conducting oxidation of the hard alloy in the conditions of oxygen enrichment, rotation, and wetness increasing, specifically, the temperature is 700-1000 DEG C, the time for thermal insulation is 0.5-6.5 hours and the gas flow speed is 0.1-10.5m3, / h, and the wet oxidizing atmosphere is used for driving an injector through a pump to inject water into a forge at the injection speed of 0.1-300ml / min. The high-efficiency energy-saving oxidation method of the waste hard alloy is easy to operate, short in process, low in energy consumption, has no specific requirement for production equipment, and can prolong the service life of the equipment; the recovery rate is high, and by adoption of the method, the prepared oxide precursor power has good quality, therefore the high-efficiency energy-saving oxidation method of the waste hard alloy has high market application value and economic value, and is suitable for industrial production.
Description
technical field [0001] The invention relates to a high-efficiency and energy-saving oxidation process for waste hard alloys, which belongs to the technical field of metal materials. Background technique [0002] Cemented carbide is a multi-phase composite material made of refractory metal compounds WC, TiC, TaC, etc. as the matrix, transition metals Co, Fe, Ni as the binder phase, and sintered by powder metallurgy. Because of its high hardness, good toughness, wear resistance, heat resistance, corrosion resistance and a series of excellent comprehensive properties, it is widely used in cutting tools, molds, geological and mining tools, precision machining, wear-resistant and corrosion-resistant parts Among them, tungsten-cobalt cemented carbide is the most commonly used cemented carbide. With the rapid development of economy and technology, the demand for cemented carbide is increasing, which will inevitably lead to an increase in the number of discarded cemented carbide pr...
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