Preparation method of beta-tetrabasic zinc chloride, and application of beta-tetrabasic zinc chloride serving as animal feed additive

[0025] Example 1:

[0026] A preparation method of β-basic zinc chloride of the present invention includes the following steps:

[0027] Add zinc chloride (ZnCl 2 ) 150g and 100g of water, turn on the stirring to fully dissolve the zinc chloride, and then slowly add 22.4g of ZnO to the stirred zinc chloride solution. After the temperature is raised to 80°C, the reaction is kept constant for 2h. As the reaction progresses, the reaction system Gradually become viscous; after the reaction is over, 1000mL of acetone is added to the reaction system for crystallization, the reaction temperature is continued to stir for half an hour, and the reaction is reduced to room temperature, filtered by pressure, the filter is washed 3 times with acetone, and put into the drying room at 60℃~ Dried at 100°C, crushed through a 40-mesh sieve, and finally prepared β-basic zinc chloride product (β-Zn(OH)Cl) with a yield of 85%. The zinc content and the content of arsenic, lead and cadmium in the product are determined with reference to the zinc oxide standard (HG2792-1996 feed additive zinc oxide) method. The finished product contains 55.5% zinc, 30.1% Cl, and 1.3 ppm, lead content is 2.5ppm, cadmium content is 2.8ppm; XRD is used to detect the crystal composition and structure of the finished product, and the XRD pattern of the product is consistent with the standard pattern (see Example 3 for unit cell parameters).

[0028] Example 2:

[0029] A preparation method of β-basic zinc chloride of the present invention includes the following steps:

[0031] Example 3:

[0032] A preparation method of β-basic zinc chloride of the present invention includes the following steps:

[0033] (1) First, dissolve 2000g of zinc hypoxide with 50% zinc content in 1000ml 35% hydrochloric acid solution for one acid leaching. The temperature during the first acid leaching is controlled at 40℃ and the pH value is controlled at 4.5. The reaction product is filtered. After the filtered filtrate is subjected to a plate filter press, the filtrate is subjected to oxidation treatment. During the oxidation treatment, air is continuously passed into the filtrate. The temperature during the oxidation treatment is controlled at 80°C and the pH value is controlled at 5.0~ 5.2. After oxidation treatment for 1.5 hours, perform secondary plate filter press, and then add active zinc powder to the filtrate after the secondary plate filter press. The addition amount is about 1.2 times of the number of moles of heavy metal impurities such as copper, lead and cadmium in the filtrate. , Remove heavy metals such as lead and cadmium in the filtrate, and then obtain 250ml of 24% zinc chloride aqueous solution after three times of plate filter press;

[0034] (2) Slowly add 23g of ZnO to the zinc chloride aqueous solution prepared in step (1), heat up to 90°C and react at a constant temperature for 3 hours, then add ethanol to the reaction system, continue to stir and react for a period of time at the reaction temperature, and then cool down. The material is filtered under pressure, and the filtered crystals are dried in a drying room at 140°C, crushed through a 40-mesh sieve, and finally prepared β-basic zinc chloride product (β-Zn(OH)Cl).

[0035] The zinc content and the content of arsenic, lead and cadmium in the product of this example are determined with reference to the zinc oxide standard (HG2792-1996 feed additive zinc oxide) method. The zinc content in the finished product is 55.5%, the arsenic content is 1.4ppm, and the lead The content is 2.1ppm, the cadmium content is 2.2ppm; the crystal composition and structure of the finished product are detected by XRD, and the XRD pattern of the product is consistent with the standard pattern (see figure 1 ) (The unit cell parameters of the β-basic zinc chloride product are: a.5.86, b.6.58, c.11.33; α90, β90, γ90; V436.871).