摘要:
An improved process for accelerating the digestion process in the Bayer alumina process is provided which promotes both the goethite-hematite conversion and a more perfect and quick dissolution of the diaspore. The above is achieved by carrying out the digestion in the process of 5-20% by weight calculated on the dry weight of the bauxite of a novel hydrogarnet catalyst.
摘要:
The invention relates to an improved process for the production of alumina according to the Bayer technology, of bauxites containing goethite and especially of boehmitic or diasporic bauxites, for the acceleration of the digestion process, for the transformation of goethite into hematite, for the increase of alumina yield and for the reduction of the caustic soda losses, the essence of which consists in carrying out the digestion in the presence of 2-6% CaO and 0.2-2.0% Mg.sup.++, Fe.sup.++, Mn.sup.++ Co.sup.++ ions based on the weight of the dry bauxite or of compounds or ores containing these ions in the indicated quantities.
摘要翻译:本发明涉及一种根据拜耳技术生产氧化铝的改进方法,含有针铁矿的铝土矿,特别是硼酸铝或铀矿铝土矿,用于加速消解过程,用于将针铁矿转变成赤铁矿,以增加 氧化铝产量和苛性钠损失的降低,其本质在于在2-6%CaO和0.2-2.0%Mg ++,Fe ++,Mn ++ Co ++离子的存在下进行消化,其基于干燥的重量 铝土矿或含有这些离子的化合物或矿石。
摘要:
The invention relates to a process for the reduction of sodium hydroxide losses of the Bayer-cycle by modified causticization of red mud which comprisessubjecting an optionally previously concentrated red mud slurry led off from the red mud washing line by ramification and containing a liquid phase which has a concentration of 5-40 g. caustic Na.sub.2 0/1. caustification by adjusting the lime content expressed as CaO through addition of lime or lime milk to 1-3.2 moles per mole Al.sub.2 O.sub.3, preferably to 2-2.5 moles per mole Al.sub.2 O.sub.3, related to the total Al.sub.2 O.sub.3 content of the slurry;stirring the slurry for 0.3-5 hours at a temperature of 70.degree.-110.degree. C., preferably at 80.degree.-100.degree. C.;adding to the slurry 3-4 moles, preferably 3.2-3.4 moles, of soda related to 1 mole of the originally dissolved Al.sub.2 O.sub.3, and continuing the stirring for 1-4 hours at 80.degree.-100.degree. C., preferably at a temperature of 90.degree.-95.degree. C.;if necessary causticizing the excess of soda by adding lime or lime milk by methods known per se;if desired concentrating the slurry thus obtained and re-introducing the liquid phase thereof to the red mud washing unit which corresponds to the sodium hydroxide content thereof;and re-entering the slurry to the red mud washing line.The advantages of the process of the present invention are as follows: the sodium hydroxide losses of different origin of Bayer-type alumina production are recovered by a single operation step, the process is simple, requires no expensive equipment and is economical.
摘要翻译:本发明涉及通过红泥的改性苛化来降低拜耳 - 循环的氢氧化钠损失的方法,该方法包括将由红泥浆清洗线引出的任选预先浓缩的红泥浆经分散和含有液相 浓度为5-40g。 苛性钠Na20 / 1。 通过将石灰或石灰乳添加为1-3.2摩尔/摩尔Al 2 O 3,优选为2-2.5摩尔/摩尔Al 2 O 3,通过调整CaO表示的石灰含量与浆料的总Al 2 O 3含量相关; 在70-110℃,优选在80℃-100℃下搅拌该浆料0.3-5小时。 向浆料中加入3-4摩尔,优选3.2-3.4摩尔与1摩尔原始溶解的Al 2 O 3有关的苏打,并在80℃-100℃下,优选在 90°-95℃。 如果需要,通过本身已知的方法加入石灰或石灰乳来苛化苏打水; 如果需要浓缩由此获得的浆料并将其液相再引入对应于其氢氧化钠含量的红泥洗涤单元; 并将浆料重新进入红泥清洗线。 本发明方法的优点如下:通过单一操作步骤回收拜耳式氧化铝生产不同来源的氢氧化钠损失,工艺简单,不需要昂贵的设备,而且经济。
摘要:
A method of electrolytically recovering gallium and/or alkali metals from alkali metal solutions, preferably aluminate (sodium aluminate) liquors from aluminate production in which the gallium or alkali metal is electrolytically deposited on a mercury layer of the thickness of several microns applied to a metallic support which is more electronegative than mercury (preferably copper) by amalgamation or cementation from a mercury salt solution. The deposition of metals is carried out at a temperature below 50.degree. C and the cathode is then treated with a solvent, e.g. mercury or water, to remove the deposited elements.
摘要:
The invention relates to a process for the integral optical examination of damaging mechanical stresses arising in the bottom-part of bottles and hollow glasswares. In accordance with the process the bottom-part of the glasses/bottles/is illuminated with a light bundle from the mouth, the cross-sectional intensity distribution is controlled by the aid of a light bundle with predetermined angle of aperture, with the integral optical system the bottom is illuminated with a light with quasi-homogeneous intensity. The passing light is modulated and led into the photodetector, the signal of which is analysed through a band-filter. The invention includes the apparatus for the implement of the process according to the invention. The apparatus has a laser (1), a laser bundle (2) emitted therefrom, a polar filter (3), connected with a light-chopper (4), a bundle stretcher consisting of the collecting lenses (5,6), the diaphragm (8), a polar filter (14) and the photodetector (15).
摘要:
A method for production of toxin-binding, non-toxic, modified, biopolymers and the use thereof for the treatment of septic shock, infections and toxic states and to the use of them as carriers for transportation of biologically or therapeutically important materials (enzymes or drugs) into phagocytes or cells bearing Fc and complement receptors and as a natural source of energy for cells. The toxin binding, non-toxic structurally modified biopolymers are prepared by the reaction of polysaccharides containing alpha 1,4 or 1,6 linkages with glucose-1-phosphate catalyzed by glycogen phosphorylase enzyme in a buffer solution at pH 6.8-7.4 at a temperature of 20.degree.-30.degree. C. and by the separation of the obtained biopolymers in a well-known manner.
摘要:
The present invention relates to a new process for stabilizing the clay minerals in reservoir rocks containing oil, in particular in rock comprising sandstones, sand, or marliceous sandstones as well as eliminating the electrostatic dispersion and swelling of the clays when steam injection is used for mineral oil exploitation. According to the process, cations capable of stabilizing the reservoir rock, having a hydrated diameter of 0.13 to 0.15 nm, preferably potassium and/or ammonium and/or zirconium ions are introduced in the form of a 0.01 to 5.0 N aqueous solution or in the form of a vapor mixture or a mixture of steam and gas(es).
摘要:
An automated wet sieving apparatus and process are provided comprising a wetting liquid distributor which is coupled by eccentric disks to a motor which drives the distributor in an orbital path for supplying the liquid onto a sieve. Means are provided for creating alternating vacuum and pressure below the sieve. The vacuum draws undersized particles whose size is being determined through the sieve and the pressure loosens blinding particles from the sieve. Preferably, the sieve is cyclically tilted as the wetting liquid is being distributed onto the sieve.