After addition of silver and zinc refining, the residue is still fluid Bi 1.5 to 3.5% zinc, zinc chloride after refining slag outputs chloride, zinc chloride is a raw material to produce chemical products. First, the process The process flow is shown in Figure 1, including processes such as dissolution, purification, and concentration. Figure 1 Zinc chloride production process Second, the main technical conditions (1) Dissolving. 1:1t liquid to solid ratio was accelerated dissolution can be directly caught into the steam heating pipe, the density of the resulting solution 1.5 to 1.55 g / cm 3, typically using an aqueous two-stage countercurrent leaching. (2) One purification. Plus zinc replacement heavy metal impurities other. Boil the solution and stir it when adding the zinc powder. For the replacement, the zinc powder should be added 2 to 4 times. The amount of zinc powder is 3% to 4% of the amount of zinc chloride slag. (3) Secondary purification. The supernatant is extracted to a purification tank, and chlorine gas is oxidized to remove iron . The amount of chlorine gas is 5%, and the method of adding potassium chlorate may also be used. The oxygen-passing time is generally 1 to 3 hours. (4) Water releases iron. The chlorinated solution is heated to boiling, 7 to 8% of CaCO 3 is added, and about 1% of BaCl 2 is added to control the pH to 5.2 to 5.7, and the iron is hydrolyzed and precipitated. (5) Concentrated and boiled. Enamel cooking pots to fire on coal paste solution, crushed by a bar, coolish packaging should prevent moisture. Third, the main equipment Dissolving and purifying three tanks; one vacuum suction filter; the concentration tank adopts a jacketed enamel reaction kettle. Fourth, product use Zinc chloride is widely used in agriculture and medicine. Used as preservative and disinfectant in dyeing and weaving industry, as wood preservative, organic synthetic dehydrating agent, condensing agent and catalyst; used in electroplating galvanizing; manufacturing dry battery, welding flux; manufacturing rubber paper, zinc pigment, fireproof wood; Astringent, corrosion inhibitor. V. Product quality The product has ZnCl 2 ≥ 98.0%, Pb ≤ 0.002%, Fe ≤ 0.001%, Ba ≤ 0.3%, and SO 4 2 - ≤ 0.01%.
Fischer-Tropsch wax can be used in plastic processing, such as injection molding, extrusion and pelletizing industries. In the production process of masterbatch and modified plastics, Fischer-Tropsch wax contributes to the dispersion of fillers and excellent smoothness during mixing. It can be used as an external lubricant for PVC. The low viscosity can increase the production speed of the product. It helps to disperse the pigments and fillers during mixing. It is especially useful in the extrusion of high-viscosity systems. It is more than ordinary PE WAX. 40-50% less, and can significantly improve the surface gloss of the product. When using intense colors, the melted Fischer-Tropsch wax can effectively wet the dye and reduce the extrusion viscosity.
When used in the ink as a particulate powder, it can improve the wear resistance and wrinkle resistance of the applied material. When applied to the coating, it can have a wrinkling effect, and when used in a micro powder state, it can form a wrinkle effect of stripes and water lines. When powder coating resin is added, it plays a role of lubrication in the extrusion process, which can reduce screw torque, reduce energy consumption and improve production efficiency.
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