First, the production process.
Figure 1.
Figure 1 Flow chart of the production of three salts of PbCl 3 slag
Second, the main technical conditions.
The lead chloride slag is ball milled to -20 mesh leaching, the leaching liquid composition: NaCl 3 20-340 g / liter, HCl 10 ~ 15 g / liter; liquid-solid ratio 8:1; leaching temperature higher than 90 ° C; mechanical stirring; leaching The time is 2 hours; the filtration temperature is higher than 60 °C.
Dilute the crystals; dilute with water, pH 1 to 3; dilute the precipitation time for 24 hours: cool at room temperature, wash the PbCl 2 crystals with water until the pH of the washing water is about 5, and dilute the mixture to concentrate and return to leaching.
Carbonic acid conversion: soda ash equivalent to PhCl 2 crystals 40-405% is dissolved in hot water at 80 °C, and lead chloride crystals are slowly added during stirring to convert, liquid-solid ratio 2:1, conversion temperature above 100 °C, conversion The time is about 2.5 hours, washed to neutrality, and filtered to obtain lead carbonate.
Nitric acid dissolution: The nitric acid was diluted with 3 times of water, and the slurryed lead carbonate was slowly added during stirring to completely dissolve to lead carbonate-free.
Sulfuric acid conversion: Add diluted dilute sulfuric acid, the amount of sulfuric acid is slightly lower than the calculated value, convert to PbSO 4 and wash away the free acid root until the pH is 7 to stop washing.
Solid base was converted to: PbSO 4 slurry into the liquid to solid ratio of 2.5, was added under stirring 40 to 50% NaOH, stirred for 3 hours or base addition was complete, NaOH controlled by analyzing the amount of SO 3 of 7.5% to 8.5%.
Three-salt adjustment: In the solid-base conversion, the product may contain SO 3 too low or too high, so further adjustment is needed; when SO 3 is too low, then sulfuric acid is added. When SO 3 is too high, NaoH is added to adjust production. Qualified products. After centrifugation filtration, the distilled water is washed to remove the sulfate, and then dried in an oven at 150 to 250 ° C, pulverized by a wind mill, and vacuum-filtered.
Third, the main equipment.
One ball mill ; one leaching tank, dilution tank, carbonic acid conversion tank, nitric acid dissolving tank, sulfuric acid conversion tank, solid alkali conversion tank, using jacketed enamel reactor, mechanical stirring; two centrifuges; one oven; One mill.
Fourth, product use.
Mainly used as a heat stabilizer for polyvinyl chloride plastics, electrical insulation materials and artificial leather.
5. Product quality (%).
PbO 89±1, SO 3 8±0.5, water content not higher than 0.4, fineness (-200 mesh), 99.5 or more, appearance of white powder.
Glazed Tile and Ridge Cap Roll Forming
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Machine Description
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Quantity
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Delivery time
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Container Type
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Price(FOB TIANJIN)
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glazed
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1 SET
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45 working days
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Machine Description
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Quantity
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Delivery time
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Container Type
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Price(FOB TIANJIN)
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ridge cap roll forming machine
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1 SET
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45 working days
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One 40GP
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USD14500---19500
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