Most of China's refractory raw materials mines are manually hand-selected. In order to improve the quality of the ore, reducing the level of mixing, 1979 to 1988 units Shenyang magnesium aluminate and Design Institute Yangquan bauxite and other cooperation, Experimental study of flotation grade alumina clay mineral mining Taihu conducted, using the test The positive flotation process (Fig. 1), the slurry is adjusted with sodium carbonate and sodium hexapate, and the mixture is oxidized with 4:1 oxide wax and tar oil to achieve the classification and purification of the raw materials.

In addition to soft, semi-soft clay, refractory clay deposits need to be calcined before they can be sold as products. Taking Yangquan bauxite ore as an example, the mine is calcined using rotary kiln and heavy oil is used as fuel. The calcination temperature depends on the grade of calcined raw meal, special grade 1700～1750°C, grade I 1650～1700°C, grade II 1600 ~ 1650 ° C. The kiln speed also depends on the grade of the calcined raw meal, special grade 80 ~ 85s / r, grade I 75 ~ 80s / r, grade II 65 ~ 70s / r. The amount of material to be discharged is 18 to 20 t/h. Material residence time is 3 ~ 3.5h. Figure 2 shows the production process of the calcining plant. The chemical composition of the calcined clinker is: high grade aluminum: Al 2 O 3 88%, TiO 2 3.89%, Fe 2 O 3 1.37%, SiO 2 5.90%; grade I high aluminum Al 2 O 3 83.13%, TiO 2 3.45%, Fe 2 O 3 1.12%, SiO 2 13.2%; II grade A high aluminum: Al 2 O 3 75.60%, TiO 2 3.32% , Fe 2 O 3 1.78%, SiO 2 18.6%; II B grade high aluminum: Al 2 O 3 72.90%, TiO 2 3.23%, Fe 2 O 3 1.21%, SiO 2 21.60%. The density of clinker: special grade 3.27t/m 3 , grade I 3.07t/m 3 , grade II grade 2.80t/m 3 , II grade 2.60t/m 3 . Water absorption rate of clinker: special grade 2.4%～8.1%, grade I 3.0%～9.2%, grade II grade 3.8%～10.80%, II grade B 6.1%～ 15.90%. The refractoriness of clinker is greater than 1 790 °C. The sieve blanks are all less than 10% and the impurities are less than 4%.

Potassium Formate

Potassium formate is a derivative of the simplest organic acid. It has no structure similar to carcinogens and does not produce bacterial resistance. Toxicity test shows that the acute toxicity level of potassium dicarboxylate is very low, and the use of potassium dicarboxylate according to the instructions will not have any toxic effect on consumers and operators. Within the specified range of 0.6% - 1.8%, the only potassium dicarboxylate residue that can be detected in animal products is formate, and its amount in pig tissues will not produce toxicity; the only residue in animal excreta is formate, which will not cause environmental pollution. The proportion of formate concentration in edible tissue is very small, so it is safe for consumers of livestock and poultry products.

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