The least expensive and the easiest way of getting substitute for organic sand is by crushing all-natural stone to get artificial sand of preferred size and grade which could be free from all impurities.There is scarcity of all-natural sand due to heavy demand in expanding construction activities which forces to locate the appropriate substitute.
According to the real condition we can know that, important period of crushing is that the material from crushing cavity the unloading point on the rays to impact plate to intersection down to row impact plate .so the liner impact plate design method is the followings:.
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2%, were among the causes of the outburst of dolomite and gas that occurred in 2009 .The porosity of the analyzed samples was determined on the basis of a pointwise quantitative microscopic analysis. From the point of view of gas-related hazards, including geodynamic hazards, increased porosity implies the presence in the rock of space that may contain gas, and usually also means that the tensile strength of the rock is lower than that of rocks with similar structure but lower porosity. The total porosity of the samples ranged from 2. Studies of outburst material from the Rudna mine, carried out at the Strata Mechanics Research Institute of the Polish Academy of Sciences, showed that the high porosities of the dolomite, ranging from 16.51%.05%. The mean porosity was 9.2% to 20.32% to 23.
Furthermore, a significant increase in [MgOH+] occurs at pH10. At pH2 there is an increase in [CaHCO3+] and decreases again at pH10. An increase in the concentration of NaHCO3(aq) is seen at pH6 which then drops at pH8. In Figure 10a it can be seen that the concentrations of CaCl+ and CaNO3+ remained the same despite increases in pH. At pH8, there is an increase in [CaCO3(aq)] whilst [CaOH+] rises at pH10. As the pH increases from pH 2, [Mg2+], [Ca2+] and [Na+] decrease and thus other species form. [NaCO3−] increases as pH increases from pH 8 whilst [NaOH(aq)] increases as the pH of 5SPW increases from pH 10. Evident increase in the concentration of MgCO3(aq) is seen at pH8. MgSO4(aq) decreases at pH10.Figure 10 shows the distribution of Ca2+, Mg2+ and Na+ in 5SPW for a pH range of 2–12. Figure 10c shows the speciation of Na+ in 5SPW; there is an increase in the concentration of NaSO4−(aq) beyond any other Na+ species above pH 3. At pH2, the presence of CaSO4(aq) supersedes any other Ca2+ bearing species in solution. In Figure 10b a strong presence of MgCl+ and MgSO4(aq) is seen, though not higher than Mg2+.
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