Abstract: The present invention relates to a procedure for preparation by a wet reduction method of nanometric particles of metallic silver, with diameter ranging from 1 to 100 nm and an average diameter of 20 to 40 nm, with monodispersion characteristics, stabilities exceeding 12 months and in a wide range of concentrations. The process comprises 4 stages: a) preparation of the reducing agent solution, taken from the tannins group and preferably tannic acid; b) preparation of a solution of soluble silver salts; c) reaction and, d) liquid-solid separation; the particle size is determined by the nature of the reducing agent and by the pH control of the currents. The final stage is designed for separating and concentrating the material after which the user can prepare the product for integration thereof in the desired medium.

Abstract: A method for avoiding the agglomeration of pellets of several kinds of materials when treated at high temperatures, which comprises: covering the pellets with a long term stabilized magnesium hydroxide suspension which can be stored for at least three months without substantial agitation and without experiencing substantial settlement and solid hard substrate formation, comprising a solid content of about 51% to 61%; a water content of about 39% to 49%; a viscosity of about 500 to 1,500 cp.; an average particle size of about 1 to 2.5 microns; a Mg(OH).sub.2 content of about 50% to 60%; an equivalent magnesium oxide content of 34% to 42%; including a compound that improves the adhesion of the suspension to the pellets at a concentration of at least 30% in an amount of 0.

Abstract: A method for decoloring sulfuric acid containing organic reatives by which it is possible to obtain a crystalline sulfuric acid having a color index of less that 30 APHA unities, by adding controlled amounts of potassium chlorate and hydrogen peroxide in a controlled environment.

Abstract: A process for the production of synthetic dolomite comprising: grinding a dry and low impurity level mineral dolomite; incorporating additives selected from the group consisting of iron as Fe.sub.2 O.sub.3, silica (SiO.sub.2) and magnesium hydroxide Mg(OH).sub.2, calcium hydroxide Ca(OH).sub.2 or a combination of both, in order to react and integrate dolomite impurities as the desired silica (SiO.sub.2), iron (Fe.sub.2 O.sub.3), and alumina (Al.sub.2 O.sub.3), in the dolomite; wholly mixing these additives with the ground dolomite in a mixer machine; compacting the mixed materials in order to form briquettes; sieving the briquettes of compacted material to eliminate fines; burning the briquettes to a temperature of 1,700 to 2,200.degree. C. to guarantee a complete sintering; cooling the briquettes and sieving the cooled briquettes.

Abstract: A long term stabilized magnesium hydroxide suspension which can be stored for at least six months without substantial agitation and without undergo substantial settlement nor solid hard substrate formation, comprising a solid content of about 51% to 62%; a water content of about 38% to 49%; a viscosity of about 50 to 400 cp.; an average particle size of about 1 to 2.5 microns; a Mg(OH).sub.2 content of about 50% to 60%; an equivalent magnesium oxide content of 34% to 42%; and including an anionic polyelectrolyte as a dispersant agent, and which is obtained by washing, filtering and repulping magnesium hydroxide solids to obtain agglomerated solid particles, dispersing the agglomerated solid particles by comminution in a dispersing equipment, to reduce the particle size providing a dispersed product, grinding the dispersed product to additionally reduce the particle size to about 2 microns; and adding an anionic polyelectrolyte at a concentration of at least 25%, in an amount of about 0.5 to 1.