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41. 发明专利

DE541627C 未知
公开(公告)号：DE541627C
公开(公告)日：1932-08-22
申请号：DE541627D
申请日：1930-07-01
申请人： VAW VER ALUMINIUM WERKE AG
发明人： GINSBERG DR HANS
IPC分类号： C01F7/40

42. 发明专利

GB366015A Improvements in and relating to the treatment of materials containing silica 未知
公开(公告)号：GB366015A
公开(公告)日：1932-01-22
申请号：GB3178330
申请日：1930-10-22
申请人： ERNST JUSTUS KOHLMEYER
IPC分类号： C01F7/40
摘要： Ores and other materials containing silica and/or silicates and oxides of light metals such as aluminium, beryllium and magnesium or high melting heavy metals such as zirconium, chromium and vanadium are mixed with metal sulphides and carbon and the mixture is heated to such temperatures that, without melting, the silicon is driven as a volatile product comprising silicon and sulphur in the atomic ratio Si : S. A temperature of 1350-1400 DEG C. is suitable. If zinc sulphide is the sulphide employed a zinc-silicon-sulphur vapour is given off which is thought to contain the compound Zn-Si-S which has been formed from an intermediately formed compound Zn-C-S. Other sulphides with the exception of aluminium sulphide may also be employed, for example ferrous sulphide, silicon sulphide (Si-S) vapour being produced. The reaction mixture may be agglomerated by briquetting, pressing or sintering. According to an example bauxite is mixed with zinc blend and carbon and the mixture is heated to 1350-1400 DEG C. The highly combustible gases evolved are burnt to produce zinc oxide and silica. The zinc oxide may be removed by lixiviation with acids or alkalis. By controlling the temperature of the combustion the silica may either be obtained as insoluble silicic acid or a colloidal silicic acid which may be converted into silica gel. The materials may be treated to remove a greater part of their silica content by flotation before applying the process. Specifications 232,549, [Class 1 (iii), Oxides &c., Metallic], and 341,160 are referred to.

43. 发明专利

DE531401C 未知
公开(公告)号：DE531401C
公开(公告)日：1931-08-10
申请号：DE531401D
申请日：1926-11-17
申请人： TURE ROBERT HAGLUND
IPC分类号： C01F7/40

44. 发明专利

GB313409A Improvements in or relating to the production of aluminium oxide 未知
公开(公告)号：GB313409A
公开(公告)日：1930-05-29
申请号：GB1778629
申请日：1929-06-10
申请人： VAW VER ALUMINIUM WERKE AG
IPC分类号： C01F7/40
摘要： 313,409. Vereinigte Aluminium- Werke Akt.-Ges. June 9, 1928, [Convention date]. Aluminium oxide.-The molten slag consisting largely of aluminium sulphide obtained by subjecting a mixture of bauxite and a sulphur containing material such as pyrites to a reducing smelting process, for instance with coal, is chilled before its solidification, as by a current of gas or steam or by being passed into water or being delivered on to a cooled or moving iron plate or into a cooled rotating drum or into a liquid metal, such as aluminium, of lower specific gravity than the melt. By this means the oxide is obtained in a fine state of division.

45. 发明专利

GB294079A Method of producing aluminium oxide from aluminium sulphide or mixtures containing same 未知
公开(公告)号：GB294079A
公开(公告)日：1928-07-19
申请号：GB274328
申请日：1928-01-27
申请人： METALLBANK & METALLURG GES AG , CONWAY BARON VON GIRSEWALD
IPC分类号： C01F7/40
摘要： 294,079. Metallbank und Metallurgische Ges. Akt.-Ges., and Girsewald, Conway, Baron von. Jan. 27, 1928. Alumina; calcium sulphide. - Aluminium sulphide, or a mixture thereof with alumina resulting for example from an eleotrothermic process for extracting alumina from aluminiferous materials, is reacted with calcium oxide or a calcium compound such as the carbonate to convert the sulphide to oxide, and the calcium sulphide formed is removed from the product by leaching as with a dilute acid. A mixture of the solid sulphide and calcium oxide may be heated say to 800-900‹ C. and carefully stirred, the reaction being then completed by the heat of reaction; or a melt of the sulphide or of a sulphide-oxide mixture may be run on to powdered calcium oxide with stirring. In the first case the product is boiled first with water and then with hydrochloric acid, and in the second washed with dilute acid, to remove the calcium sulphide.

46. 发明专利

GB232549A A process for the treatment of raw materials containing highly refractory oxide 未知
$A process for the treatment of raw materials containing highly refractory oxide$
公开(公告)号：GB232549A
公开(公告)日：1925-11-26
申请号：GB2903524
申请日：1924-12-03
申请人： TURE ROBERT HAGLUND
IPC分类号： C01F7/40 , C22B4/00
摘要： Refractory oxides such as alumina, magnesia, chromium oxide or zirconium oxide are obtained from crude materials which in the case of alumina may be bauxite, clay, alundum, feldspar, shale, carboniferous clay, coal dross &c. by fusing the raw material mixed with a carbonaceous reducing agent such as coke, anthracite charcoal or calcium carbide and a sulphur-bearing body such as a sulphide of a heavy metal (pyrites, galena, copper pyrites, copper matte), a sulphide of aluminium, calcium barium, magnesium or sodium, or a mixture of a sulphate such as calcium or barium sulphate and a sulphide. The fusion is effected in an electric arc furnace, the arc being covered by the charge. When there is much sulphur in the charge, metallic iron may be added. The reducible metals and the silicon form an alloy which is easily separable from the sulphide slag in which the refractory oxide is dissolved. In the case of bauxite, the alloy consists of iron, titanium and silicon. The slag is cooled (causing the crystallization of the dissolved oxide) and is treated with water, acid, alkali, or steam to dissolve or decompose the sulphide and leave the oxide. When aluminium sulphide occurs in the slag the treatment with water produces aluminium hydroxide which is separated from the crystalline alumina by mechanical means and may be employed in the next charge. The materials for the fusion may be briquetted. The crystalline product may be purified from magnetic materials by electrostatic or electromagnetic separation and from any remaining sulphide by treatment with acid, or from other impurities by treatment with alkali. The Specification as open to inspection under Sect. 91 (3) (a) mentions as aluminous raw materials firebrick, alum, and "leptite." This subject-matter does not appear in the Specification as accepted.

47. 发明专利

FR555219A 未知
公开(公告)号：FR555219A
公开(公告)日：1923-06-26
申请号：FR555219D
申请日：1922-08-19
IPC分类号： C01F7/40 , C22B4/00

48. 发明专利

FI874851A0 未知
公开(公告)号：FI874851A0
公开(公告)日：1987-11-03
申请号：FI874851
申请日：1987-11-03
申请人： KALI & SALZ AG
发明人： SINGEWALD ARNO , NEITZEL ULRICH , FRICKE GUENTER
IPC分类号： B03B9/00 , B03C7/00 , B03D1/02 , C01D5/00 , C01F5/40 , C01F7/40 , C01F

49. 发明专利

FR780335A 未知
公开(公告)号：FR780335A
公开(公告)日：1935-04-23
申请号：FR780335D
申请日：1934-09-21
申请人： NORTON CO
IPC分类号： C01F7/40

50. 发明专利

DE578917C 未知
公开(公告)号：DE578917C
公开(公告)日：1933-06-19
申请号：DESC080539
申请日：1926-10-27
申请人： GUSTAV SCHOENBERG DR
IPC分类号： C01F7/40

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