Effects of water hardness on the dispersion of fine coal and kaolinite in coal slurry;

by adding Magnesium Chloride to slurry for improving water hardness,and solving the problem about the lower slurry water hardness causing the increase of concentrating machine overflowed fine slime,long cycle of pressure filtering machine prolonged,increasing input and output material time of filter press,and the slightness of thickener clear aqueous layer.

It was measured that coal slurry concentration、granular fraction distribution、ζ-potential、pH value、water hardness、sludge surface element composition、function group and wetting quality with such characteristic methods as XRD, IR, XPS, pH meter, Electrophoresis analyzer, Spectrophotometer, Contact angle analyzer, Laser particle size analyzer, Ion Chromatography, Nephelometer, and so on.

Comparison test of total hardness of the ground water quality by robust statistical techniques

The Synthesis of a New Chromogentic Reagent Dibromo-o-Carboxychlorophosphonazo and its Application for the Determination of Hardness of Water and Calcium of Magnesium in Water;

Effect of hardness of water on the expansion rate of sea cucumber

A study of applying modified soybean hull in decreasing water hardness;

The relation between the property and type of dampening solution and dilute water hardness is introduced, property index (such as pH value, specific conductivity, and surface tension)of dampening solution formulated with water with various hardness is tested through experiment.

This experiment was designed to determine the effect of water hardness on the acute toxicity of copper for fry of grass carp(Ctenopharyngodon idellus),silver carp(Hypophthalnichtys molitrix)and loach (Misgournus mizolepis).