Method for preparing big-compensating forcing white carbon black and high concentration ammonium fluoride through aminating of fluosilicic acid

Abstract

A preparation method of highly reinforced white carbon black and high concentration ammonium fluoride through fluosilicic acid ammoniation relates to a preparation method of chemical product, in particular relating to a preparation method of inorganic power material. The invention carries through ammoniation reaction by steps with the fluosilicic acid and ammonia. The white carbon black is acquired after filtrating, washing and drying. The invention is characterized in that the ammonia is added in by steps and the filter is carried through by steps. The steps are that a, 30 to 70 percent of the total ammonia is added in the fluosilicic acid to carry through ammoniation reaction, the reaction liquid is aged, filtrated to acquire a filter cake and a filter liquid; the ammonium fluorosilicate is added in the filter liquid acquired in step a and then the ammonia is added to carry through ammoniation reaction, the reaction liquid is aged, filtrated to acquire the filter cake and the filter liquid; c, the left ammonia is added in the filter liquid acquired in step b and then the reaction liquid is aged and the aged liquid is filtrated to acquire the filter cake and high concentration ammonium fluoride mother liquid; d, the filter cakes acquired by filtrating are respectively washed and dried to prepare the white carbon black.

Description

technical field [0001] The present invention relates to a preparation method of chemical products, in particular to a preparation method of inorganic powder materials, more specifically, it utilizes fluorosilicic acid, a by-product of the phosphate fertilizer industry, to prepare highly reinforcing white carbon black and co-produce high-concentration fluoride ammonium method. 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 to...

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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, because the acidification operation is carried out on the filter cake, a large amount of acid waste water will be generated in the washing process, which will pollute the environment, and the quality of the produced silica product is not high, and the specific surface area is on the low side. The strengthening effect is limited, it is difficult to use as high reinforcing silica

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