A method for reducing lead content in tin protochloride
A technology of stannous chloride and lead content, which is applied in the field of lead removal and can solve problems such as excessive lead content
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Embodiment 1
[0018] Put 200kg, 250kg, 300kg of stannous chloride (Pb%=0.014%) in 2m 3 Add 500L of deionized water to the reaction kettle, stir, and after it is completely dissolved, add 20kg of sodium hydroxide, adjust the pH of the solution to 8, continue to raise the temperature of the solution to 60°C, and press barium chloride After the mass ratio of lead ion in stannous chloride is 20:1, add 25kg of barium chloride solution dropwise, add 25 times of sodium carbonate solution, stir for 1h under this condition, and then centrifuge the stannous chloride solution Produced barium carbonate white precipitation, obtains transparent raw material low-lead stannous chloride solution, stand-by. The stannous chloride after deleading is reacted with pyrophosphate to obtain stannous pyrophosphate products, and the above stannous chloride is used in different mass concentrations to obtain lead contents of 0.0035%, 0.0039% and 0.0041% in the products respectively.
Embodiment 2
[0020] Put 200kg of stannous chloride (Pb%=0.014%) into 2m 3 Add 500L of deionized water to the reaction kettle, stir, and after it is completely dissolved, add 20kg of sodium hydroxide, adjust the pH of the solution to 8, continue to raise the temperature of the solution to 60°C, and press barium chloride After the mass ratio of lead ion in stannous chloride is 30:1, add 37.5kg of barium chloride solution dropwise, add 25 times of sodium carbonate solution, stir for 1h under this condition, and centrifuge the stannous chloride solution The white precipitate of barium carbonate produced by separation was obtained to obtain the transparent raw material low-lead stannous chloride, which was set aside. The stannous chloride after deleading is reacted with pyrophosphate to obtain stannous pyrophosphate product, and the lead content in the product reaches 0.0030%.
Embodiment 3
[0022] Put 200kg of stannous chloride (Pb%=0.014%) into 2m 3 Add 500L of deionized water to the reaction kettle, stir, and after it is completely dissolved, add 20kg of sodium hydroxide, adjust the pH of the solution to 8, continue to raise the temperature of the solution to 65°C, keep stirring, press barium chloride After the mass ratio of lead ion in stannous chloride is 40:1, add 50kg of barium chloride solution dropwise, add 25 times of sodium carbonate solution, stir for 1h under this condition, and then centrifuge the stannous chloride solution Produced barium carbonate white precipitate, obtains transparent raw material low-lead stannous chloride solution, stand-by. The stannous chloride after deleading is reacted with pyrophosphate to obtain stannous pyrophosphate product, and the lead content in the product reaches 0.0035%.
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