CN1318512A - Method for preparing white carbon uisng kaolin decomposing process - Google Patents

Abstract

The process of preparing white carbon black includes the steps of the preparation of suspension with kaolin ore and water, drying, crushing and roasting; the preparation of 50 % concentration water solution of sulfuric acid; mixing the solution and mineral powder for reachion; dilution and filtering of the reaction liquid; reaction of filter cake and dilute nitric acid solution in a reactor while heating to 60-80 deg.c and stirring for 1 hr; filtering; washing the cake to neutrality, roasting, cooling and crushing of the filter cake to obtain white carbon black. The said process can produce white carbon black product reaching the dry process product standard, is simple and low in cost compared with wet process, and has no "three waste" discharged.

Description

The method of preparing white carbon uisng kaolin decomposing process

The invention belongs to a kind of method of producing white carbon black.

The method of producing white carbon black at present generally has two kinds, i.e. dry method and wet method.Dry method is through high humidity hydrolysis or high humidity chlorination and get with silicoorganic compound.Though this method product purity height, particle are thin, reinforcement is good, raw materials used more expensive, to equipment, technical requirements height, so its use is restricted.And the used raw material of wet method is more cheap, and the preparation method is also simpler, but its product purity is low, and dispersity is poor, and reinforcement is also poor.

The objective of the invention is to, a kind of raw material cheapness is provided, is easy to get, production cost is low, the quality product height, and the white carbon black production method of non-environmental-pollution is to address the above problem.

The present invention is achieved in that kaolin ore is made into suspension with water in changing stock tank, crushed after being dried is to 325 orders, moisture content is removed in roasting again, be made into the sulfuric acid of concentration 50% again with deionized water and sulfuric acid, under agitation add breeze after the roasting, react, after finishing, reaction is diluted to 32B é with deionized water, refilter, filtrate imports in the Tai-Ace S 150 pond, and filter cake washs 2～3 times with deionized water, and wash water imports in the sulfuric acid pond in the lump, add barium sulphide and be neutralized to neutrality, impurity and purification, concentrate, after the cooling Tai-Ace S 150; Filter cake is put into reactor, add dilute nitric acid solution, under agitation be warmed up to 60～80 ℃, reacted one hour, filter, filtrate imports in rare nitric acid pond, and filter cake, is pulverized after drying, roasting, the cooling and promptly got white carbon black to neutral with the deionized water washing.

The present invention compared with prior art, its quality product can reach the standard that dry method (vapor phase process) is produced, and equipment and technology are more simpler than wet method (salt acid precipitation method), cost is lower; Its raw material (kaolin) is abundant, and is cheap; Substantially do not have " three wastes " and discharge, help environment protection.

Embodiments of the invention: to produce one ton of white carbon black is example, 2 tons of kaolin ores are made into suspension with water in changing stock tank, separate big particle and silt with wet cyclone, crushed after being dried is to 325 orders, remove crystal water at roasting kiln roasting (700～900 ℃ of temperature) again, be made into the sulfuric acid of concentration 50% again with deionized water and sulfuric acid, under agitation add breeze after the roasting, react, be diluted to 32B é with deionized water after reaction is finished, filter with whizzer again, filtrate imports in the Tai-Ace S 150 pond, filter cake washs 2～3 times with deionized water, and wash water imports in the sulfuric acid pond in the lump, adds the good barium sulphide of roasting and is neutralized to neutrality, alum liquor after the impurity and purification, after filtration, filtrate is concentrated to about 115 ℃, pulverizes behind the cooling curing and promptly gets Tai-Ace S 150 finished product (byproduct); Filter cake is put into reactor, add dilute nitric acid solution, under agitation be warmed up to 60～80 ℃, reacted one hour, filter with whizzer, filtrate imports in rare nitric acid pond, and filter cake is extremely neutral with the deionized water washing, through 150 ℃ of dryings, again 700～800 ℃ of roastings 2 hours, be crushed to 325 orders after the cooling and promptly get white carbon black.

Adopt breeze directly to pressurize without roasting 3～3.5KG/ centimetre ², reacting 4～6 hours, aluminium sesquioxide acid leaching yield and roasting breeze synthesis under normal pressure are basic identical.

Claims (1)

1, a kind of method of preparing white carbon uisng kaolin decomposing process, it is characterized in that: kaolin ore is made into suspension with water in changing stock tank, crushed after being dried is to 325 orders, moisture content is removed in roasting again, be made into the sulfuric acid of concentration 50% again with deionized water and sulfuric acid, under agitation add breeze after the roasting, react, be diluted to 32B é with deionized water after reaction is finished, refilter, filtrate imports in the Tai-Ace S 150 pond, filter cake washs 2～3 times with deionized water, wash water imports in the sulfuric acid pond in the lump, adds barium sulphide and is neutralized to neutrality, impurity and purification, concentrate, get Tai-Ace S 150 after the cooling; Filter cake is put into reactor, add dilute nitric acid solution, under agitation be warmed up to 50～80 ℃, reacted one hour, filter, filtrate imports in rare nitric acid pond, and filter cake, is pulverized after drying, roasting, the cooling and promptly got white carbon black to neutral with the deionized water washing.