Method for producing high reinforced carbon white by aminating fluorosilicic acid

Abstract

This invention relates to a method for preparing white carbon black with high reinforcing ability by ammoniation of fluorosilicic acid. The method comprises: (1) adding ammoniation agent (30-70% of the total amount) into fluorosilicic acid, and ammoniating at 20-65 deg.C; (2) aging the ammoniation solution, and filtering to obtain filtrate and filter cake; (3) adding the rest ammoniation agent into the filtrate, ammoniating at 20-55 deg.C, aging the ammoniation solution, filtering to obtain mother liquor and filter cake, and sending the mother liquor to the following process; (4) washing the filter cakes, and drying to obtain white carbon black. The method has a high profit, and is environmentally friendly.

Description

technical field [0001] The invention relates to a method for preparing chemical products, in particular to a method for preparing inorganic powder materials, and more specifically to a method for preparing high-reinforcing white carbon black by utilizing fluosilicic acid, a by-product of the phosphate fertilizer industry. Background technique [0002] White carbon black is hydrated silicon dioxide, the general molecular formula is: SiO 2 ·nH 2 O is a widely used chemical product, which can be used in rubber, plastic, paint, ink, pesticide, medicine, food, feed, paper and other industries. Its largest use is as a reinforcing filler for rubber, and its consumption accounts for more than 75% of its total output. Fluorosilicic acid is usually a by-product of the production of wet-process phosphoric acid and general calcium. In 2005, my country's phosphate fertilizer output was 100% P 2 o 5 Calculated at 11.25 million tons, the by-product fluosilicic acid can be converted int...

AI Technical Summary

Problems solved by technology

Fluorosilicic acid is usually a by-product of the production of wet-process phosphoric acid and general calcium. In 2005, my country's phosphate fertilizer output was 100% P 2 o 5 Calculated at 11.25 million tons, the by-product fluosilicic acid can be converted into 100% H 2 SiF 6 In my country, most of the fluosilicate is recovered in the form of sodium fluosilicate, but the use of sodium fluosilicate is narrow, the economic benefit is poor, and it is often unsalable, which seriously affects the enthusiasm of manufacturers to recycle fluosilicate. This restricts the development of the phosphate fertilizer industry, which not only causes a serious waste of fluorine and silicon resources, but also pollutes the environment to a large extent

At present, there is a method for preparing white carbon black through sodium fluorosilicate, a by-product of phosphate fertilizer, but sodium fluorosilicate is an indirect by-product of the phosphate fertilizer industry after all, and its production cost must be higher than that of directly preparing white carbon black through fluorosilicic acid. There are reports on the preparation of white carbon black by the reaction of fluosilicic acid and soda ash or ammonium bicarbonate, but the disadvantage of these two processes is that a large amount of carbon dioxide gas is produced in the reaction. If it is not recycled, it will inevitably pollute the environment, and recycling will prolong the process route. Increase the equipment investment, and at the same time, due to the acidification operation on the filter cake, a large amount of acid waste water will inevitably be produced in the washing process, polluting the environment, and the quality of the produced white carbon black product is not high, and the specific surface area is on the low side, which is harmful to rubber. Reinforcing effect is limited, it is difficult to use as highly reinforcing silica

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