Paint Making and Color Grinding: A Practical Treatise for Paint Manufacturers and Factory Managers, Including Comprehensive Information Regarding Factory Arrangement; Pigments; Vehicles and Thinners; Liquid and Cold Water Paints as Well as Practical Working Formulas and Recipes

Front Cover
Painters magazine, 1913 - Paint - 483 pages
0 Reviews
 

What people are saying - Write a review

We haven't found any reviews in the usual places.

Other editions - View all

Common terms and phrases

Popular passages

Page 59 - When the test shows the pigment to be thoroughly washed, it is filter pressed, the cakes so formed are placed on wooden trays, the trays stacked up on suitable trucks and these put into drying rooms usually built of metal and heated by exhaust steam which is aided by jets of olive steam. When the cakes of lithopone have dried, they are fed into the hopper of a disintegrator, which pulverizes the lumps into a powder of uniform fineness, and when this powder has been put up in barrels or casks of suitable...
Page 57 - ... caustic soda, 0.2 per cent. The average yield of lithopone from this material was 41 per cent of a normal grade averaging 29.85 per cent zinc sulphide, 1.63 per cent zinc oxide, and 68.52 per cent barium sulphate. "The cost of manufacture depends upon the situation of the plant, a plentiful supply of water, as enormous quantities are required for the washing of the product; facilities for discharging the materials from railroad cars or boats, economical methods of handling the same, up-to-date...
Page 58 - When this black ash and its solution is being prepared, zinc spelter, zinc dross or scrap zinc or any available zinc salt is being dissolved in separate vats or tanks in sulphuric acid, forming a solution of zinc sulphate. The...
Page 58 - ... sulphate solution should be of a concentration of 60 per cent and at a temperature of 140 to 150 deg. F., when they are poured together, and the zinc solution should be poured at double the rate of the barium solution, in which case a precipitate is obtained that can be filtered and dried." "It is evident that when zinc dross is used and in any case unless refined spelter is employed, the zinc solution must be treated with a compound that will eliminate all traces of iron and other foreign materials....
Page 60 - ... in barrels or casks of suitable size, the product is ready for the market." The one great feature about the manufacture of lithopone, as compared with that of white lead, is in its quick manufacture, for a working batch of lithopone can be turned out in three or four days, whereas even quickprocess white lead will require at least one month from the time the pig lead is unloaded, with one single exception that of the so-called mild process of white lead. It stands to reason that the capital tied...
Page 56 - ... consumption of these materials, are as follows: Crude barytes, 37.30 per cent; bituminous coal, 26.59; spelter or scrap zinc, 9.63; oil of vitriol (sulphuric acid), 22.05; rock salt, 3.39; sal ammoniac, 0.44; sodium phosphate, 0.14; chlorate of potash, 0.31; calcium chloride, 0.13; caustic soda, 0.2 per cent. The average yield of lithopone from this material was 41 per cent of a normal grade averaging 29.85 per cent zinc sulphide, 1.63 per cent zinc oxide, and 68.52 per cent barium sulphate....
Page 60 - ... which is aided by jets of olive steam. When the cakes of lithopone have dried, they are fed into the hopper of a disintegrator, which pulverizes the lumps into a powder of uniform fineness, and when this powder has been put up in barrels or casks of suitable size, the product is ready for the market." The one great feature about the manufacture of lithopone, as compared with that of white lead, is in its quick manufacture, for a working batch of lithopone can be turned out in three or four days,...
Page 56 - ... to the shadow. The following additional facts regarding lithopone manufacture, etc., are abstracted by permission from an article copyrighted by and appearing in the Oil Paints and Drug Reporter of Nov. 20, 1911 : ' ' The materials used in a successful lithopone plant comprise barytes (crude), coal, spelter, oil of vitriol, common salt, sal ammoniac, sodium phosphate, chlorate of potash, calcium chloride, and caustic soda. Taking the average figures for several years, the percentages by weight...
Page 58 - ... required for washing the product.) Where perfectly clear water can not be had, large tankage for filtering the water for levigating is absolutely needed." "The barium sulphide solution and the zinc sulphate solution should be of a concentration of 60 per cent and at a temperature of 140 to 150 deg. F., when they are poured together, and the zinc solution should be poured at double the rate of the barium solution, in which case a precipitate is obtained that can be filtered and dried.
Page 59 - In calcining in the muffle furnace, sal ammoniac to about 1 per cent, of the dry weight of the pigment is added to assist fusion. When the material is thus prepared it is carried to the burrstone mills by means of centrifugal pumps and pipes, or by other mechanical appliance and there ground in the pulp state to the standard degree of fineness, and then conveyed to the washing tanks, where it is washed over as often as it is necessary to eliminate all traces of impurities, free sulphur...

Bibliographic information