2. Overview of the olivine silica production The olivine silica process will be described, using sulphuric acid as an example. A schematic process flow diagram is presented in figure 1. In the first section the acid is neutralized at elevated temperatures with ground forsteritic olivine rock. The reaction equation is: (Mg,Fe) 6SiO 84H >Si(OH) (s)
Precipitated silica, a form of synthetic amorphous silicon dioxide, is derived from quartz sand, a crystalline form of silicon dioxide. The physical properties of precipitated silica can be manipulated during the manufacturing process to deliver products with a wide range of performance-enhancing features engineered for many different end-use applications.
Precipitated silica, a form of synthetic amorphous silicon dioxide, is derived from quartz sand, acrystalline form of silicon dioxide. The physical properties of precipitated silica can be manipulated during the manufacturing process to deliver products with a wide range of performance-enhancing Features engineered for many different end-use ...
Precipitated silica is an amorphous form of silica (silicon dioxide, SiO 2); it is a white, powdery material.Precipitated silica is produced by precipitation from a solution containing silicate salts.. The three main classes of amorphous silica are pyrogenic silica, precipitated silica and silica gel.
Because in the olivine nano-silica process almost all the. olivine has reacted with sulfuric acid, the yield depends mainly ... Production of Precipitated Silica from Olivine, US 2000/0263657; 2005.
Nano-silica, one of the substances boosting the field of nanomaterials, can be produced by dissolving olivine in acid. The dissolution of olivine is a convenient alternative route to the existing methods of nano-silica production (neutralization of sodium silicate and flame hydrolysis) because the olivine dissolution is a low temperature process making this method cheaper and greener.
A kinetic model for the dissolution of olivine in sulphuric acid at elevated temperatures is presented. Such a model is essential for the design of an industrial process for the neutralization of waste acids by olivine, or for the production of precipitated silica from olivine.
the global precipitated silica market was US$2.22 bn in 2015 and will increase to US$3.49 bn by 2023.3 To meet the increasing demand for quality amorphous precipitated silica, it is vital to nd different silica precursors and cheaper production technologies. Two main technologies are used for the manufacture of APS: a pyrogenic method and
Abstract: Process for the production of precipitated silica from olivine including the following steps:—providing olivine particles with a particle size preferably below 1 mm in diameter,—preferably mixing olivine and water to form an olivine/water slurry,—mixing the olivine/water slurry with hydrochloric acid (HCl), preferably at a concentration at 18 wt % or above, and at a …
1. Introduction Amorphous precipitated silica (APS) contributes to living standards in a wide range of applications, such as the reinforcement of elastomer products like tires, rubber goods, and drug delivery systems. 1,2 APS is widely used in Europe for making energy efficient tires that have less friction, thus helping to reduce vehicle fuel consumption, 1 and there is an increasing demand ...
The schematic process of OMS production is shown in Fig. 1.The main procedure to synthesize the ordered mesoporous silica with olivine as precursor was as follows: Triton X-100 was dissolved in a 3M H 2 SO 4 solution at 50 °C and stirred continuously for 24 h. For the preparation of OMS with enlarged pore size, heptane or ethanol was mixed as a swelling agent at this step.
Flow diagram for the production process of precipitated silica [1]. Silica gels are also produced by the neutralization o f water glass with acids but, in this case, under acidic co nditions.
purity. Because of the good properties of the olivine nano-silica and the low energy requirements, the oli-vine dissolution process is a convenient alternative to the commercial methods of nano-silica production. Fig. 1 – Schematic process flow diagram of the olivine process The SSA, both internal and external, is a crucial pa-
3. Process yield of the olivine nano-silica. The process yield, Y NS, is defined as the rate between the nano-silica produced experimentally, NS_ exp, and the potential nano-silica present in the olivine calculated theoretically, NS_ th1, (2) Y NS (%) = m NS _ exp m NS _ th 1 × 100. The theoretical nano-silica is expressed as (3) m NS _ th 1 = m ol × M SiO 2 × M ol, where m ol is the …
The Olivine Proccess for the neutralization of waste acids was invented in 1985 at the University of Utrecht and patented (Duth Patent PCT NL 85/00026), the patent is currently owned by Geochem Research B.V. From 1986-1987 research on the improvement of the neutralization process and on applications of the neutralization products has been ...
of 45,000 tons/year. Precipitated silica (SiO 2) is the oxidation of non-metallic compounds. it has a solid powder form, white, odorless, insoluble in water, and has a crystalline structure. The process of manufacturing of precipitated silica using silicate acidification uses …
Schematic process flowsheet of the Olivine Process . 5 process steps to the sustainable production of precipitated nano silica . Commercial Olivine nano-silica . Olivine nanosilica of high purity . SELOR. eeig. Levi, Finland 23 – 25 April 2013 . Lab scale nanosilica optimisation .
olivine nano-silica and the low energy requirements, the olivine dissolution process is a convenient alternative to the commercial methods of nano-silica production. Table 1 Summary of the properties of different amorphous nano-silica [3,7,10] Parameters Pyrogenic Precipitated Lieftink This work Purity, SiO2 (%) >99.8 >95 - >95 SSABET (m
From this process, a total of 35 g of Mg(OH) 2 was produced from 100 g of olivine, with 1 g of Mg(OH) 2 added in the silica precipitation stage. Approximately 5 g of iron oxide was precipitated ...
Process for production of precipitated silica from olivine Process for the production of precipitated silica from olivine including the following steps: providing olivine particles with a particle size preferably below 1 mm in diameter,preferably mixing...
The potential for using MgO and SiO2, recovered from olivine, was investigated for use as a cementitious binder system. The MgO to SiO2 proportion for the binder was fixed at 1:1. The nature of the hydration products were characterized using a variety of techniques including isothermal calorimetry, XRD, FTIR, and SEM. The primary binding component of the paste was determined to be …
Abstract: Process for the production of precipitated silica from olivine including the following steps: providing olivine particles with a particle size preferably below 1 mm in diameter, preferably mixing olivine and water to form an olivine/water slurry, mixing the olivine/water slurry with hydrochloric acid (HCl), preferably at a Concentration at 18 wt % or above, and at a temperature ...
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Furthermore, this process can use waste olivine materials for the production of nano-silica. The produced nano-silica has a specific surface area between 100 and 400 m. 2 /g; a primary particle size between 10 and 25 nm, which is agglomerated in clusters; and an impurity content below 5 wt.%. In addition, olivine nano-silica can be
olivine silica production process, experimental setup and first results and further research. 1.1 Production of nano-silica At present a wide range of silica products is manufactured industrially for a diverse array of applications. Silicas are mainly used for reinforcing, thickening and flattening purposes. In 1999 the world precipitated ...
By preparing precipitated silica directly from olivine it is not necessary to use potassium silicate which is normally made from quartz (SiO 2) and Na 2 CO 3, at approximately 1400° C. or from quartz and Na(OH) at 150°-200° C. and high pressure . Production costs will be lower in the olivine-based process than in the traditional one since:
The olivine dissolution process is a convenient alternative to the traditional methods of nano-silica production; and that is because the low energy requirement makes it possible to use this ...
The main objective of the invention is to provide a cost efficient and environmental friendly manufacturing process for spherical amorphous silica with desirable particle size and surface characteristics from silicate minerals.
The potential for using MgO and SiO 2, recovered from olivine, was investigated for use as a cementitious binder system. The MgO to SiO 2 proportion for …
In a method for manufacturing silica a leaching of natural silicates is performed with hydrochloric acid or other mineral acids, draining, drying and possibly a grinding up of the residue of the product obtained. In order to obtain a spherical silica with a controlled particle size and surface characteristics a mineral olivine with the highest possible degree of purity is employed as the basic ...