42results about How to "Uniform and stable particle size" patented technology

The invention discloses a method for preparing potassium chloride from carnallite raw ore. The method comprises the following steps of generating low-sodium carnallite slurry in a first flotation device from carnallite raw ore slurry; feeding the low-sodium carnallite slurry into a first screening device to obtain a first oversize product and a first undersize product; feeding the first oversize product into a crushing device, and returning the crushed first oversize product to the first flotation device; containing crystallizer underflow and crystallizer overflow liquid are from the first screen underflow in a crystallizer; conveying the bottom flow of the crystallizer into a second screening device to obtain a second oversize product and a second undersize product, conveying the second oversize product into the crushing device, and conveying the second undersize product into a fourth concentrating device for producing potassium chloride; and generating crude potassium slurry in the second flotation device form the overflow liquid of the crystallizer, and feeding the crude potassium slurry into the fourth concentrating device for producing potassium chloride. According to the method, the low-sodium carnallite ore pulp is subjected to circulating screening-crushing treatment, so that the particle size of the first screen underflow is uniform and stable, the crystallizer overflow liquid is subjected to reverse flotation again, and the potassium resource is recycled.

The invention discloses a molten steel casting residue treatment and recycling method which comprises the circular treatment steps of slaking, screening, magnetic separation and the like. The f-CaO in casting residue is slaked by vapor to accelerate the expansion and efflorescence of the casting residue, thereby solving the problem on the separation of the casting residue from a tank body and reducing dust nuisance. According to the method, a mixture of water spray casting residue and pyrolytic steel slag is used as the raw material, and the pyrolytic steel slag has the advantage of low f-CaO content, thereby ensuring that the f-CaO content of the final product can meet the requirements of cement and construction material industries; and a rod grinder treatment process is used, thereby achieving favorable grinding effect and ensuring that the product is uniform and stable in particle size. For the product disclosed by the invention, slag steel of which the grade is greater than 80% can be returned for steel making; purified steel shots and magnetic separation powder of which the grade is greater than 42% can be used for a sintering procedure; and steel tailings of which the iron content is smaller than 2% and the f-CaO content is smaller than 3% can be used for producing steel slag powder, steel slag cement, construction material products and road materials. The invention maximally recycles the metal material in the casting residue, realizes the zero discharge of industrial solid waste and ensures that the casting residue can be recycled 100% at a high added value.

The present invention provides a bonding type stationary phase chiral chromatographic column preparation method, which comprises: preparing a silica gel bonded with the unsaturated double bond, loading the silica gel into a chiral chromatographic column, preparing a polysaccharide derivative bonded with the unsaturated double bond, injecting the polysaccharide derivative into the chiral chromatographic column in a solution form so as to make the polysaccharide derivative be uniformly adsorbed on the silica gel surface, and injecting an initiator solution into the chiral chromatographic column, such that the unsaturated double bond of the silica gel and the unsaturated double bond of the polysaccharide derivative are subjected to a polymerization reaction so as to form the bonding type stationary phase. According to the preparation method of the present invention, the adsorption step and the bonding step in the conventional preparation method are completed in the chromatographic column, such that the steps and the process are simplified, characteristics of simpleness, rapidness and high efficiency are provided, the prepared chiral chromatographic column stationary phase is uniform, the bonding type stationary phase chiral chromatographic column can be used for a variety of strong polar mobile phases, the column efficiency is high, and the separation effect is good.