DE3437842A1 - Simplified moisture determination of solids (bulk solids) by weighing the slurry - Google Patents

Abstract

In order to determine the moisture percentage of solids, the weight of the moist material and of the dry material must be known. In the conventional moisture determination method, water is evaporated in order to obtain the dry weight of the solid. In this simplified moisture determination described, the dry weight of the solid is determined by calculating the proportion of solids of a suspension (slurry). The advantages achieved by the invention consist particularly in the fact that, in order to determine the moisture percentage, time-consuming drying and subsequent calculation is no longer necessary, but that instead this value can be read off directly.

Description

Description: Simplified moisture determination of

Solids (bulk goods) using a turbidity balance.

In the NalS processing, moisture determinations are carried out in order to determine, for example, the dry feed quantity used, dewatering filter and dryer performance and dry concentrate quantities. Samples of the material to be examined are usually weighed, thermally dried and, after the water has evaporated, the dry residue is weighed . The percentage of water in the sample is calculated as follows: Depending on the amount and humidity of the material to be examined, the evaporation of the water can take a few hours.

This method must be regarded as accurate, since it also applies to different specific gravity of the solids provides exact results.

With a known and constant specific weight

of the solid to be examined can be a simplified moisture determination Carry out as follows: Wet material is placed in a turbidity measuring vessel with a capacity of 1000 cm3 from about 1000 to 1500 g given and weighed. The measuring vessel is made with this weight filled with water and weighed this turbid weight (g / l).

From these two values (initial weight and turbidity = weight), the moisture content of the initial weight is determined as follows: Formula structure: In the first mentioned formula: can be used instead of moisture: weight minus solid.

Since the solids content of a slurry is calculated using the formula: can be used: If the specific weight is known (e.g. 4.2) can be used for the factor are used: 1.3125 The formula for calculating the humidity is now: The respective arithmetic operation can be saved either by using a one-off function scale, with the weight on the ordinate and the pulp weight as characteristic curves. The abscissa is used to read off the moisture in% (Fig. 1), or by making a dial for a weight scale, whereby the moisture in% can be read off immediately after the measuring vessel has been filled with water (Fig. 2).

In the latter case, it is essential to adhere to a specified weighed-in quantity Condition, e.g.

1000, 1500 or 2000 g. The theoretical measuring ranges are shown in the picture 3 shown.

For fine-grained and hydrophobic material (e.g. flotation concentrates) the weighed-in amount should not exceed 1500 g, as a larger The amount of added water was poorly mixed with the dampening material.

As already mentioned, this is a quick method of determining moisture only with known specific weight of the material to be examined can be used exactly. at minor deviations in specific weight this method can still be used for Processes where changes or fluctuations in the moisture content are determined should be. A deviation in the specific weight (e.g. 4.2) by 0.1 results in an error of only approx. 0.7% HzO.

Finally, the time and heating energy savings are due this method pointed out.

Claims (1)

Claims: Approach to simplified moisture determination of solid stumps (bulk goods) by means of turbidity scales, characterized in that the Ther = mixed drying for evaporation of the water components and the percentage Moisture after weighing the material using a function scale or immediately can be read from the dial on the balance.