First, the process.
As shown in Figure 1. Including leaching, purification, crystallization, conversion, drying and other processes.
Figure 1 Process for the production of yellow dans by lead chloride slag
Second, the main technical conditions.
Leaching: After the ball slag is ball milled, it is leached with saturated brine, the liquid-solid ratio is 10:1, the leaching temperature is 109 ° C, the leaching solution pH is 3-5, and the leaching solution contains lead higher than 65 g/l.
Purification of copper : Adding Na 2 S or sponge lead to remove copper, the liquid temperature is 90 ° C, and the copper content after copper removal is less than 0.001 g / liter.
Purification and iron removal: adding hydrogen peroxide or sodium hypochlorite to remove iron (sodium hypochlorite is prepared by using chlorine gas into 30% liquid alkali), and the iron content after de-ironing is less than 0.0001 g/l.
Cooling crystallization: using jacketed circulating cold water cooling, mechanical stirring, the solubility of lead chloride in sodium chloride solution decreases with temperature, and PbCl 2 crystals are precipitated. The mother liquor is returned to the leaching.
Conversion: PbCl 2 crystals were washed with distilled water and added to a 30% liquid base. The response is:
PbCl 2 +2NaOH = PbO + 2NaCl + H 2 O
The industrial liquid alkali used first removes iron with MgCl 2 , generally 1 to 5 kg per ton of liquid alkali plus MgCl 2 , after the iron is heated, the liquid alkali is heated to 95 ° C for conversion, and the liquid containing NaOH is not less than 2.5 N after the conversion, so as to avoid Other basic lead salts are formed.
Washing and drying: The alkali-containing PbO is filtered by a centrifuge, and the mother liquor is concentrated to a 30% liquid alkali after filtration, and returned for conversion. The PbO crystals are washed with hot distilled water to a pH of 8, and indirectly heated to 105 ° C with steam, and dried and sieved to form a finished yellow dan.
Third, the main equipment.
One ball mill : leaching tank, copper removal tank, iron removal tank, cooling tank, conversion tank, one jacketed enamel reaction kettle; one centrifugal filter; one rotary drum dryer; Several pumps.
Fourth, product use.
Huang Dan used as a drier in paint: ceramic industry as glaze; used in the production of lead glass with optical glass, optical fiber, electronic vacuum glass, etc.; can also produce lead nitrate, lead acetate, lead chrome yellow; industry.
V. Output quality (%).
A PbO-containing product is not less than 99, the metal lead is not higher than 0.1, PbO 2 not more than 0.2, nitrate insolubles not higher than 0.2, sieve residue (- 200 days) not more than 0.2; product contains two PbO is not lower than 97, Pb is not higher than 0.3, PbO 2 is not higher than 0.5, nitric acid insoluble matter is not higher than 0.5, and sieve residue (-200 mesh) is not higher than 0.5.
The inner skeleton is professional rust-proof and tested by salt spray test bench to extend the storage life effectively.
The pleated filter layer has an outer skeleton that protects the filter layer and distributes the incoming fluid evenly over the filter layer.Also the outer skeleton can protect the filter layer away from mechanical damage.
The logo is printed on the outer skeleton, it` also a sign for OEM.The logo can be seen clearly until it`s out of service life.
Filtration rating in µm:
BH/HC: 3-20
Size:
0030, 0035, 0055, 0060, 0075, 0095, 0110, 0140, 0160, 0240, 0260,0280, 0300, 0330, 0450, 0500, 0650, 0660,0900, 0990, 1320, 1500
Available pressure stability:
BH/HC:210bar
Compatibility with hydraulic fluids ISO2943
-Hydraulic oil H to HLPD DIN 51524
-Lubrication oils DIN 51517, APJ, ACEA, DIN 51515, ISO6743
-Compressor oil DIN 51506
-Biodegradable operating fluids VDMA24568, HETG, HEES, HEPG
-Non-flame operating fluids HFA, HFB, HFC, and HFD
Replacement Filter Elements,Water Filter Element,Return Filter Element,Bh/Hc Filter Element
Xinxiang Shengda Filtration Technique Co., Ltd. , https://www.filtrations.nl