84results about How to "Reduce particle content" patented technology

The invention provides a polymetallic ore beneficiation wastewater recycling method. The polymetallic ore beneficiation wastewater recycling method is characterized by comprising two steps of physical treatment and biological treatment. According to the polymetallic ore beneficiation wastewater recycling method, the existing beneficiation wastewater output equipment and tailings ponds of aluminium and zinc beneficiation industries are used, wastewater treating agents such as calcium hydroxide, saponification slag and calcium carbide are added to wastewater in a mixing tank so as to ensure that suspended matters in the wastewater settle, the wastewater is purified so as to meet the technical requirements that obtained clear water is continuously used for beneficiation, the content of suspended matters in the treated water is less than 100mg / L, the pH value of the treated water is 8, and the cyclic utilization of the beneficiation wastewater is realized. The polymetallic ore beneficiation wastewater recycling method has the characteristics of low investment, low running cost, energy conservation, emission reduction and cyclic economy and is suitable for the cyclic utilization of the polymetallic ore beneficiation wastewater.

The invention provides a preparation method of activated calcium silicate. The method comprises the following steps: mixing lime milk, pulverized ash desilliconization liquid and a particle size control agent for reaction to obtain activated calcium silicate slurry, wherein the particle size control agent is one of pyrophosphate, metaphosphate, polyphosphate, polyacrylic ester and polyacrylate, the addition amount of pyrophosphate, metaphosphate or polyphosphate is 0.2-2.5% of dry weight of the pulverized ash desilliconization liquid and lime milk, and the addition amount of polyacrylic ester or polyacrylate is 0.05-0.5% of dry weight of the pulverized ash desilliconization liquid and lime milk. According to the preparation method, large particles in the activated calcium silicate can be effectively reduced, and the influence on the papermaking process and the quality of paper products can be reduced.

Described is a method as well as a plant for drying and comminution of moist, mineral raw materials, such as chalk, marl and clay, by which method the raw materials are dried and comminuted subject to simultaneous supply of hot gases in a drier crusher (8) from which the material is subsequently directed in suspended form to a separator (11) in which it is separated into a coarse fraction which is returned to the drier crusher (8) for further drying and comminution and into a fine fraction which is directed to the next stage of the process and where any hard material components such as flint, sand and marble are subjected to grinding in a separate grinding unit (16). The method and plant is peculiar in that a part quantity of the coarse fraction from the separator (11) is proportionately fed to the separate grinding unit (16) for the grinding of hard material components. Hence, it will be possible to substantially reduce the specific energy consumption and the CO2 emission from the kiln system due to the elimination of need prior to drying and comminution in the drier crusher to suspend the raw materials in water which must subsequently be removed. This is ascribable to the fact that the hard material components by the method according to this invention will be drained away from the circuit between the drier crusher and the separator. A further advantage of the method according to this invention is the significant reduction achieved in the wear rate of the drier crusher and its energy consumption. Furthermore, it will be possible to produce a raw meal with excellent burning characteristics due to the reduction in the content of coarse silica particles in the raw meal, which in turn will reduce the NOx emission from the kiln.