Uses of basic zinc carbonate_Industrial additives

Background and overview of basic zinc carbonate

The natural mineral basic zinc carbonate is called “hydrazinite” and is a white amorphous powder. Relative density 4.42~4.45. Soluble in dilute acids and alkali, slightly soluble in ammonia and ammonium salts, insoluble in water, ethanol and acetone. It decomposes into carbon dioxide and zinc oxide at 300°C. Acts with H2O2 to release CO2 and form peroxide. Fluorescence can occur when heated at 250 to 500°C for different times and cooled to room temperature. At present, the basic zinc carbonate sold on the market is ordinary basic zinc carbonate, and its indicators Zn content, heavy metal Pb content, moisture sulfate content, sieve residue, and cadmium content do not have specific requirements for its grain size. Research has disclosed a basic zinc carbonate nanowire and its preparation method. It mainly solves technical problems such as the current lack of basic zinc carbonate nanowire materials and preparation methods. The key points of its technical solution are: using zinc oxide (or zinc Salt) as the raw material, ammonia (or EDTA) as the complexing agent, and soluble carbonate as the precipitant, react to generate a zinc complex solution, and then add distilled water or other solvents, or heat, or add water or other solvents and then Heating to cause basic zinc carbonate to precipitate evenly and generate nanowires, which are then separated by filtration and washed with distilled water (or dilute ammonia) to precipitate, and then dried to obtain basic zinc carbonate nanowires, which are pyrene boric acid in an aqueous solution system The process for preparing basic zinc carbonate is simple, the reaction conditions are mild, and the preparation cost is very low. However, the basic zinc carbonate prepared by this method has a larger crystal size, a lower zinc content, and is of poor quality.

Uses and uses of basic zinc carbonate

Basic zinc carbonate can be used to make latex film products, pigments, rayon, catalytic desulfurizers, and is used in medicine as a light astringent, preservative, disinfectant and skin protectant.

1) Preparing a high base value basic zinc carbonate lubricating oil additive includes the following steps: a) Prepare a zinc precursor aqueous solution and a precipitant aqueous solution respectively, adjust the pH value of the zinc precursor aqueous solution to 6-9, and then Raise the temperature to 50-100°C, add the precipitant aqueous solution dropwise and react at this temperature for 0.5-10 hours to obtain a stable basic zinc carbonate sol; b) Prepare an organic medium solution of the modifier, and lower the temperature of the basic zinc carbonate sol. to 20-80°C, adjust the pH value to 7-10, and then add the modifier organic medium solution to the basic zinc carbonate sol under stirring conditions for 0.5-5 hours. After the reaction is completed, a transparent oil-water two-phase system is obtained. It can be obtained after phase separation and drying. The base value of the lubricating oil additive synthesized by this method reaches 250-mgKOH/g, which meets the requirements for high and ultra-high base numbers of detergents.

2) Prepare a zinc-based composite material. The composite material is basic zinc carbonate (Zn5(CO3)2(OH)6), and its morphology is flake; its preparation method is: combine the pure zinc carbonate with a purity of 99.9% Weigh the zinc acetate, sodium fluoride, and hexamethylenetetramine in a molar ratio of 1:1:1~5; then place the raw materials in a container and add distilled water and stir for 30 minutes to form a uniform solution; further, the obtained uniform solution Transfer to a hydrothermal reactor and react at 120°C for 12 to 24 hours. The reaction product is centrifuged and dried to obtain basic zinc carbonate lithium ion battery negative electrode material from basic copper carbonate. For the first time, the invention applies the prepared zinc-based composite material basic zinc carbonate to the preparation of negative electrode materials for lithium ion batteries. The synthesis method is simple and low-cost; the prepared basic zinc carbonate has a flake shape, with a size of 3~10mm, and an average thickness of about 200nm; the prepared material has an obvious charge and discharge platform, and has potential applications in lithium-ion batteries .

Uses and Preparation of Basic Zinc Carbonate

A production method of basic zinc carbonate, including the following steps:

(1) Add zinc suboxide to the sulfuric acid solution, stir and react to produce a zinc sulfate solution; the chemical equation for the reaction of zinc suboxide and sulfuric acid is:

During this reaction, some by-products are generated, and the chemical equation of the reaction is:

(2) Add potassium permanganate and zinc powder to the zinc sulfate solution to remove impurities to obtain an impurity-free zinc sulfate solution;

The addition of potassium permanganate can remove the divalent iron ions and divalent manganese ions in the reaction solution, that is, the removal of FeSO and MnSO in the reaction solution. The reaction equation is:

MnSO reacts with potassium permanganate to form manganese dioxide precipitate, which removes manganese ions; FeSO reacts with potassium permanganate to form iron hydroxide precipitate, which removes iron ions;

(3) Add sodium carbonate aqueous solution to the impurity-removing zinc sulfate solution, stir the reaction at a temperature of 50°C until the pH of the solution is 6.5, and then continue stirring the reaction for 0.5 at a temperature of 45°C. h.

When the pH of the solution reaches 6.5, continue stirring the reaction for 0.5 hours at a temperature of 45°C to fully mix zinc sulfate and sodium carbonate for reaction;

(4) Filter the reaction solution, wash the filter cake with purified water until the filtrate does not contain sulfate ions, dry the filter cake and crush it to obtain basic zinc carbonate. Since basic zinc carbonate is insoluble in water, washing the filter cake with water can remove water-soluble impurities, that is, remove sulfate radicals.