摘要:
The present invention relates to a process for modifying a layered double hydroxide (LDH), the process comprising, a. providing a water-wet layered double hydroxide of formula: [Mz+1-xM′y+x]a+(Xn−)a/r.bH2O (1) wherein M and M′ are metal cations, z=1 or 2; y=3 or 4, x is 0.1 to 1, preferably x
摘要:
The present invention relates to a process for the production of polyaluminium salts, preferably polyaluminium sulphate and polyaluminium chloride, and derivatives thereof, from aluminium containing raw materials and acids, wherein microwaves are used for partial heating of the reaction mixture. The present invention also relates to a system for the production of polyaluminium salts and derivatives thereof.
摘要:
The invention concerns sulfate-containing and aluminum-containing pigments having pseudoboehmitic structural units, their manufacture and use for paper making. In the manufacture of paper, these pigments produce surprisingly good printing results with inkjet color printers and are also simple to manufacture.
摘要:
Novel basic aluminum chlorosulfate solutions, having a basicity ranging from 45% to 70% and wherein more than 80% of the SO.sub.4.sup.2- values are complexed, prepared, e.g., by reacting calcium carbonate with a chlorosulfuric solution of aluminum, are useful coagulating and flocculating agents for the removal of impurities from aqueous media, notably to prepare potable water therefrom; the water thus treated contains but trace amounts of residual aluminum values.
摘要:
A novel basic aluminum chlorosulfate, well adopted for the improved purification of aqueous media, has the formulaAl.sub.n OH.sub.m (SO.sub.4).sub.k Cl.sub.3n-m-2kand characteristic basicity, Al/Cl ratio, molecular weight and hydrodynamic diameters.
摘要:
Clear and colorless solutions of basic aluminum chlorosulfates are prepared by reacting a slurry of calcium chloride and calcium carbonate with aluminum sulfate, separating calcium sulfate solids and a solution of basic aluminum chlorosulfate from the medium of reaction, and flocculating said solution of basic aluminum chlorosulfate with at least one nonionic or cationic polyelectrolyte flocculant.
摘要:
Utilization of a cationic polymer as a settling aid in the recovery of the aluminum hydroxide and an anionic polymer to dewater the aluminum hydroxide prior to redissolution not only improves the process of making basic aluminum compounds by speeding settling and improving filterability, but also unexpectedly yields a product that has superior effectiveness as a water treatment chemical.According to the invention, a dilute solution of alum is neutralized with a base to a pH below about 6.0, preferably below 5.5, to form a suspension of aluminum hydroxide. A cationic polymer is then added to the suspension to assist in the settling of the aluminum hydroxide. When settling is substantially complete, the solution is decanted from the aluminum hydroxide and an anionic polymer is added to dewater the aluminum hydroxide. The dewatered material is collected as a filter cake containing amorphous aluminum hydroxide, the cationic polymer and the anionic polymer.The filter cake formed in this manner can be combined with aluminum sulfate or other aluminum species to form basic aluminum complexes. Surprisingly, however, the basic aluminum compounds formed from the filter cake are more effective in the reduction of water turbidity than comparable basic aluminum compounds formed without the use of the cationic and anionic polymers.
摘要:
A process of producing a flocculating agent useful for water purification technology and as a substitute for aluminium sulphate in the rosin sizing of paper is described. In this process, about 100-150 parts by weight, preferably about 130 parts by weight of hydrochloric acid, calculated as 100% HCl, and 140-200, preferably 160-190 parts by weight of a sulphate-containing, aluminium hydroxide-containing sludge, calculated on the solids content of the sludge, are mixed. To obtain the sludge, alkaline pickles used in the pickling of aluminium profiles in connection with the anodization of aluminium are neutralized with sulphuric acid or aluminium sulphate. The sludge may also contain up to about 10% by weight of aluminium hydroxide. The mixture is heated and stirred at a temperature of from about 80.degree. C. to the boiling point of the mixture, preferably 95.degree.-100.degree. C., for a combined time of about 3-15 hours, preferably about 4-6 hours. The reaction product is a substantially saturated aqueous solution of polyaluminium chloride having the presumed formulaAl.sub.a (OH).sub.b (SO.sub.4).sub.c Cl.sub.3a-b-2cwherein a, b and c may have the values 13, 34 and 1, respectively.
摘要:
Aluminum chlorohydrate products include particles of aluminum chlorohydrate, in fractured crystal form, the particles having a basicity in the range of about 50% to about 85.6%, a bulk density of 40 to 65 pounds per cubic foot, and a mean particle size in the range of about 10 microns to about 15 microns. The particles may also have a surface area to weight ratio of about 295 to about 705 m2/kg, inclusive of both endpoints and all numerical values therebetween, where the ratio is measured by laser diffraction. Methods of producing such products are also disclosed.
摘要:
Submicronic barium and magnesium aluminates, useful as phosphors, are in the form of a liquid-phase suspension of substantially monocrystalline particles having an average particle size ranging from 80 to 400 nm; such aluminates are prepared by a process that includes: providing a liquid mixture containing compounds of aluminum and of other elements that are part of the aluminate composition; drying the mixture by atomization; calcining the dried product in a reducing atmosphere and wet-grinding this product.