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Molybdenum pigment
1, molybdenum yellow
- Mo is a complex of molybdenum, tungsten, bismuth salts of vanadate. The molecular formula is approximately
The molybdenum yellow raw material is bismuth nitrate Bi(NO 3 ) 3 ·5H 2 O, ammonium molybdate (NH 4 ) 2 MoO 4 ·2H 2 O, sodium tungstate (Na 2 WO 4 ), sodium vanadate (Na 3 VO 4 ) ).
First, cerium nitrate was dissolved in 2 mol of HNO 3 as an acid solution, and the latter components were dissolved in 2 mol of NaOH as an alkali solution.
Slowly add the lye to the acid solution and mix well. The precipitate formed by the reaction is filtered, washed at 105 ° C, dried at 550-600 ° C for 1 h, and finely ground to obtain a product BCD-molybdenum yellow.
The key to production is: (1) formulation accuracy (selection of m, n); (2) when the reaction is carried out, the lye is added slowly, the agitation is sufficient, and the pH is between 2 and 3.5. If the lye is added too fast or the pH is too high, the crystallization will be too fast and the grains will be too thick. PH<2 reaction is not complete and should be controlled between 2 and 3.5.
When producing small batches, it can be carried out in simple reactors, suction filters, muffle furnaces and other equipment.
2, Moly Orange
Molybdenum orange formula about 25PbCrO 4 · 4PbMoO 4 · PbSO 4 , which is made of a chromium weight lead nitrate, sodium, sulfate, and sodium molybdate, the reaction is:
Pb(NO 3 ) 2 +Na 2 MoO 4 →PbMoO 4 ↓+2NaNO 3
2Pb(NO 3 ) 2 +Na 2 Cr 2 O 7 +H 2 O→2PbCrO 4 ↓+2NaNO 3 +2HNO 3
Pb(NO 3 ) 2 +Na 2 SO 4 →PbSO 4 ↓+2NaNO 3
The key is also in the formulation, usually CrO 2- 4 :MoO 2- 4 :SO 2- 4 should be 20:3:3. The amount of Pb 2+ added should be 105% of the theoretical value.
Pb(NO 3 ) 2 is usually dissolved in HNO 3 , and other raw materials are dissolved in NaOH, and the alkali solution is slowly added to the acid solution and continuously stirred. When the pH is from low to high, the color gradually fades. When pH = 2, the product color is the freshest.
Common formula:
Pb(NO 3 ) 2 64.5%, Na 2 Cr 2 O 7 ·2H 2 O 21.1%, Na 2 MoO 4 ·2H 2 O 5.2%; Na 2 SiO 3 ·9H 2 O 2.2%, Na 2 SO 4 ·10H 2 O 6.9%.