| 单词 | calcium sulphate |
| 例句 | Much of it finds a use, notably calcium sulphate, or gypsum, which goes into building materials such as plasterboard. Up to our necks in a diabolical element 2014-07-18T04:00:00Z The rock selected for the first drilling is a very fine grained sedimentary rock cut through with veins of what appear to be a calcium sulphate. Mars rover hammers down into rock 2013-02-03T11:05:40Z This outcrop contains yet finer grains but it is cut through with veins that the rover's ChemCam laser spectrometer indicates hold precipitated minerals - most likely hydrated calcium sulphate, possibly bassinite or gypsum. Mars rover eyes rock drill site 2013-01-15T20:25:01Z Ha�yne, h�′win, n. a rock-forming mineral, a silicate of alumina and soda or lime, with sodium and calcium sulphate. Chambers's Twentieth Century Dictionary (part 2 of 4: E-M) 2012-01-11T03:00:23.770Z The "asbestos" and gypsum deposited in the caldrons were no doubt feathery and mealy calcium sulphate. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z The mineral gypsum, consisting of calcium sulphate and about 21% of water of combination, is sometimes used as a paint pigment after grinding and dehydration. Paint Technology and Tests 2011-09-15T02:00:12.263Z The residue, which contains the sulphur as calcium sulphate, is transferred to a beaker containing water to which a little bromine has been added. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z After the calcium sulphate has settled, the potassium chromate solution is converted into bichromate by the action of sulphuric acid, and the salt is allowed to crystallize. Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7 "Bible" to "Bisectrix" 2010-12-20T17:12:05.780Z The salts of iron, copper, &c., are then dissolved in water and filtered from the insoluble silica, lead sulphate, and calcium sulphate, which are washed with dilute sulphuric acid. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" Permanent hardness is caused by calcium sulphate which is soluble in 400 parts of water and cannot be removed by boiling. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. All cements having calcium sulphate as their base are suitable only for indoor work because of the solubility of this substance. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" If calcium chloride be used the precipitated calcium sulphate must be removed by filtration. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" The carbonates are dissolved in hydrochloric acid, and calcium sulphate solution is added to a portion of the solution. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" The waters of the Source Pavilion, which are used chiefly for drinking, have a temperature of 53� F. and are characterized chiefly by the presence of calcium sulphate. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 2 "Constantine Pavlovich" to "Convention" At the same time the much greater amount of sodium chloride than of calcium sulphate in sea water may explain the greater thickness of many individual salt beds. The Economic Aspect of Geology Calcium Sulphate Cements.—Under this term are comprehended all cements whose setting properties primarily depend on the hydration of calcium sulphate. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" When calcium sulphate is present, the nascent methane induces the formation of calcium carbonate, sulphuretted hydrogen and water. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" The calcium sulphate produced in the reaction is nearly insoluble, and can be filtered off, leaving the phosphoric acid in solution. An Elementary Study of Chemistry Sulphuric acid gives a white precipitate of calcium sulphate with strong solutions; ammonium oxalate gives calcium oxalate, practically insoluble in water and dilute acetic acid, but readily soluble in nitric or hydrochloric acid. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" It is frequently associated with minor quantities of anhydrite, which is calcium sulphate without water, and under the proper natural conditions either of these materials may be changed into the other. The Economic Aspect of Geology In a few minutes the surplus hydrated calcium sulphate is deposited from the solution, and the water is capable again of dissolving 2CaSO4�H2O, which in turn is fully hydrated and deposited as CaSO4�2H2O. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" By this means the calcium sulphate is converted into calcium carbonate which is insoluble in water, so that it remains distributed throughout the mass of the brick instead of being deposited on the surface. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Lead sulphate may be extracted by boiling with ammonic acetate; whilst barium, strontium, and, perhaps, calcium sulphate, will be mainly found in the residue insoluble in acids. A Text-book of Assaying: For the Use of Those Connected with Mines. The artificial manure known as "superphosphate of lime" consists of this salt and calcium sulphate, and is obtained by treating ground bones, coprolites, &c., with sulphuric acid. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" From the total weight the weight of the dish is subtracted, which gives the weight of the calcium sulphate and the calcium carbonate, and the known weight of the wool dust, etc. Scientific American Supplement, No. 315, January 14, 1882 Now, if it be the case that anhydrous calcium sulphate has a greater attraction for the first half molecule of water, then the operation of hydration will proceed very rapidly at first, more slowly afterward. Scientific American Supplement, No. 794, March 21, 1891 Many white pigments, such as zinc oxide, zinc sulphide, calcium carbonate, barium carbonate, calcium sulphate, lead white, etc., turn brown to black, and no white lacquer can be obtained with them. Handbook on Japanning: 2nd Edition For Ironware, Tinware, Wood, Etc. With Sections on Tinplating and Galvanizing They are commonly composed of—in addition to sodium bicarbonate—acid calcium phosphate, calcium superphosphate and calcium sulphate. The Chemistry of Food and Nutrition It may consist in dressing a field with nothing but stable manure, or of applying crude sulphur or brimestone instead of using calcium sulphate—plus the other lacking elements. Valere Aude Dare to Be Healthy, Or, The Light of Physical Regeneration The sample is exhausted with water, filtered, and, to eliminate calcium sulphate and basic iron sulphate, evaporated to dryness. Scientific American Supplement, No. 455, September 20, 1884 It behaved in fact similarly to the natural anhydrous calcium sulphate which is unaffected by water. Scientific American Supplement, No. 794, March 21, 1891 From an aqueous solution calcium sulphate is deposited as crystals of gypsum, but when the solution contains an excess of sodium or potassium chloride anhydrite is deposited. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 The chief constituents of the waters are calcium sulphate, sodium sulphate, magnesium chloride, calcium carbonate, and sodium chloride, and there are traces of other minerals. Somerset Others composed of calcium phosphate, calcium sulphate and silica are sometimes found. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 On the one hand, portions of anhydrous calcium sulphate, when moistened with water, dissolve as they are hydrated, forming a supersaturated solution. Scientific American Supplement, No. 384, May 12, 1883 The circumstance that the hot calcium sulphate can crystallize with 1/4 its normal amount of water indicates that for this proportion of water it has a greater attraction than for the other 3/4. Scientific American Supplement, No. 794, March 21, 1891 ANHYDRITE, a mineral, differing chemically from the more commonly occurring gypsum in containing no water of crystallization, being anhydrous calcium sulphate, CaSO4. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 This proves that the grey colour and the hardness of the leather described in the former experiment is due to the presence of calcium sulphate. Synthetic Tannins He found that it contained small quantities of silica, iron phosphate, magnesium carbonate, calcium carbonate, calcium sulphate, potassium nitrate, potassium sulphate, sodium borate, sodium sulphate, and a considerable quantity of sodium chloride. Inca Land Explorations in the Highlands of Peru When springs rise from rocks containing gypsum they are hard with calcium sulphate. The Elements of Geology |
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