GB483765A - Improvements in the manufacture and production of lead chromate colours containing lead molybdate - Google Patents
Improvements in the manufacture and production of lead chromate colours containing lead molybdateInfo
- Publication number
- GB483765A GB483765A GB222137A GB222137A GB483765A GB 483765 A GB483765 A GB 483765A GB 222137 A GB222137 A GB 222137A GB 222137 A GB222137 A GB 222137A GB 483765 A GB483765 A GB 483765A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- lead
- molybdate
- added
- suspension
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/0003—Compounds of molybdenum
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Pigments comprising mixed crystals of lead chromate and lead molybdate are obtained by reacting a suspension of a basic lead compound such as the oxide, hydroxide, carbonate or basic carbonate with a solution of chromium trioxide in the presence of molybdic acid or a molybdate, and if desired in the presence of sulphuric acid. When molybdates are used, an acid which forms a soluble lead salt, such as nitric or acetic acid, is added in an amount at least equivalent to the molybdate. Acid and/or buffer substances are preferably added before, during or after the conversion, the hydrogen ion concentration being adjusted to between 10-2 and 10-6. The colour of the product may thus be varied from orange to red, yellowish shades being obtained at very high and very low pH values within the range and reddish shades at mean pH values. Diluents or fillers, such as heavy spar or aluminium hydroxide, may be added to the products. In one example, a suspension of white lead at 25-30 DEG C. is reacted with a solution of chromium and molybdenum trioxides. In another example, to a suspension of litharge, there is added a solution of chromium trioxide, sulphuric acid, ammonium molybdate and nitric acid. Acetic acid and aqueous ammonia are added to produce a pH value of 4,0. The mixture is stirred until the colour shade undergoes no further deepening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB222137A GB483765A (en) | 1937-01-25 | 1937-01-25 | Improvements in the manufacture and production of lead chromate colours containing lead molybdate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB222137A GB483765A (en) | 1937-01-25 | 1937-01-25 | Improvements in the manufacture and production of lead chromate colours containing lead molybdate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB483765A true GB483765A (en) | 1938-04-26 |
Family
ID=9735708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB222137A Expired GB483765A (en) | 1937-01-25 | 1937-01-25 | Improvements in the manufacture and production of lead chromate colours containing lead molybdate |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB483765A (en) |
-
1937
- 1937-01-25 GB GB222137A patent/GB483765A/en not_active Expired
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