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Effect of high sand content on concrete 1. When the amount of sand is the same, if the sand is too coarse, the cohesiveness of the mixed concrete is poor, and it is easy to produce segregation and bleeding; If the sand is too fine, the total surface area of ​​the sand increases. Although the cohesiveness of the mixed concrete is better and it is not easy to produce segregation and bleeding, the amount of cement increases. 2. Concrete prepared with well-graded sand not only uses less cement slurry and saves cement, but also improves the workability, density and strength of the concrete. 3. The coarseness and particle grading of the sand are determined by sieve analysis.

The cross section of the spiral concentrator is mostly 1/4 of an ellipse, suitable for sorting mineral particles of 2 to 0.07 mm; the cross section of the spiral chute is cubic parabolic, suitable for sorting ore particles of 0.3 to 0.02 mm. The spiral concentrator and spiral chute have low investment in infrastructure, low energy consumption, simple and reliable equipment, easy operation, high enrichment ratio, and can obtain a variety of products. But the ore must be fed evenly. Compared with other mineral processing methods, gravity separation has the advantages of large processing capacity, wide particle size range, simple equipment structure, no consumption of precious production materials, low operating costs, and no pollution. Therefore, it is widely used in the mineral processing of tungsten and tin ores. . It is also widely used in the separation of ferrous metals (iron, manganese, chromium), rare metals (tantalum, niobium, thorium, zirconium, titanium, etc.) and precious meta

On April 17, a train loaded with desulfurized gypsum slowly pulled out from Bijie East Station and was transported to Fangchenggang Station in Guangxi to realize the export of bulk solid waste. This train is Guizhou’s first complete desulfurization gypsum foreign trade train. The desulfurization gypsum loaded on the train will be transported by sea and arrive at the Jinpu Terminal in Vietnam 15 days later. It has expanded the previous domestic transportation mode to international, broadened the sales radius of desulfurization gypsum, and helped “Turning waste into treasure”. It is reported that solid waste generated by thermal power generation is usually used as raw materials for building materials for dynamic consumption. In recent years, with the continuous growth of thermal power generation in our province, the amount of solid waste has also increased accordingly. The most representative ones are ash and desulfurization. Gypsum, at the same time, the construction and other industrie