Manufacture of a material on the basis of calcium- and/or magnesium carbonate having a reduced decrepitation tendency
A technology of calcium carbonate and magnesium carbonate, which is applied in the field of glass manufacturing, can solve the problems of not describing the tendency of mineral materials to burst and reduce, and achieve the effects of reducing the tendency of bursting, reducing wear and improving utilization
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example 1
[0064] example 1 The burst values of raw dolomite not treated by the method of the present invention are shown.
[0065] Example 1 was used as a baseline to calculate the pop reduction values shown in column 4.
[0066] Examples 2 to 13 Shown is the decrepitation value of raw dolomite treated by the method of the present invention. Eleven different treatments were used in Examples 2-13.
[0067] Except for Example 13, the other examples added a treatment agent equivalent to 0.5% by weight of the raw material dolomite. The results (column 4) show that in Examples 2 to 13, the popping tendency was all reduced by at least 10% compared to the baseline.
[0068] In Example 13, a treating agent (NaOH) corresponding to 1.5% by weight of the raw material dolomite was added. Comparing Example 7 with Example 13, the results show the effect of increasing the amount of treatment agent on the reduction in the burst value (column 4).
[0069] 2. Examples 14 to 17: Determination o...
example 17
[0075] Example 17 is the benchmark (untreated dolomite). By comparison, Example 16 shows that water alone has no effect.
[0076] Example 14, which involved treatment with sodium hydroxide, showed a greater effect on the popping tendency than Example 15, which involved treatment with sodium silicate.
example 18
[0077] 3. Example 18: Industrial-grade processing
[0078] At laboratory level, the above experiments show that the treatment of raw dolomite according to the invention with at least one additive selected from the group consisting of alkali metal compounds, alkaline earth metal compounds and / or mineral acids has the potential to reduce the tendency of dolomite to decompose. positive effects. To confirm this result, tests were carried out in a continuous industrial scale process.
[0079] Dolomite, commonly used in the glass industry, is treated with sodium hydroxide solution (NaOH) during its comminution. When entering the crushing line, the particle size of dolomite is between 0mm and 80mm. At the outlet, its particle size was measured between 0mm and 3mm. When the raw dolomite of 0-80 mm falls into the pulverizer, the sodium hydroxide solution is sprayed onto the dolomite through the nozzle. In this way, the pulverization step is used as a mixing step to ensure sufficien...
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