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A kind of method utilizing waste sulfuric acid to prepare iron-free aluminum sulfate and superfine activated white carbon black

A technology of iron-free aluminum sulfate and white carbon black, which is applied in the direction of aluminum sulfate, aluminum sulfur compounds, silicon dioxide, etc., can solve the problems that cannot be achieved, affect the color and dispersibility of titanium dioxide, reduce emissions, and realize resources Effects of reuse and yield improvement

Inactive Publication Date: 2016-04-06
杭州百事特实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aluminum sulfate used for titanium dioxide coating has special requirements on its iron content. At present, the iron content is required to be less than 10ppm. Higher iron content will affect the color and dispersion performance of titanium dioxide. Conventional iron-free aluminum sulfate cannot be used in the field of titanium dioxide. requirements

Method used

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  • A kind of method utilizing waste sulfuric acid to prepare iron-free aluminum sulfate and superfine activated white carbon black
  • A kind of method utilizing waste sulfuric acid to prepare iron-free aluminum sulfate and superfine activated white carbon black

Examples

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Effect test

Embodiment 1

[0038] This example provides a kind of method that utilizes waste sulfuric acid to prepare iron-free aluminum sulfate and superfine activated white carbon black, specifically as follows:

[0039] (1) Dilute 100g of sodium hydroxide to a 30% aqueous solution and add it to the reactor, then add 1000g of bauxite powder, and react for 2 hours at a pressure of 2.0kgf / cm2 and a temperature of 140°C; filter to obtain a filter residue (about 800g after drying), the filter residue was washed 3 times with 50g water each time, and the liquid obtained by washing was incorporated into the filtrate together.

[0040] (2) 400g of concentrated sulfuric acid is equipped with 40% aqueous solution and the filter residue that step (1) obtains is added in the reaction kettle together, under pressure is 3.0kgf / cm 2, temperature is 6 hours under the condition of 210 DEG C; The pressure of reactor is reduced to normal pressure, adds 2g terminal thiocarbamate hyperbranched poly(amine-amine) under 20 D...

Embodiment 2

[0043] This example provides a kind of method that utilizes waste sulfuric acid to prepare iron-free aluminum sulfate and superfine activated white carbon black, specifically as follows:

[0044] (1) Dilute 200g of sodium hydroxide to a 45% aqueous solution and add it to the reaction kettle, then add 1000g of bauxite powder, at a pressure of 1.5kgf / cm 2 1. Reaction under the condition of 100° C. for 4 hours; filter to obtain the filter residue (about 800 g after drying), wash the filter residue 3 times with 100 g of water each time, and merge the liquid obtained by washing into the filtrate together.

[0045] (2) 450g of concentrated sulfuric acid is equipped with the aqueous solution of 60% and the filter residue that step (1) obtains is added in the reaction kettle together, under pressure is 2.0kgf / cm 2 , temperature is to react under the condition of 170 DEG C for 7 hours; the pressure of the reactor is reduced to normal pressure, and 5g of sodium end thiocarbamate hyperbr...

Embodiment 3

[0048] This example provides a kind of method that utilizes waste sulfuric acid to prepare iron-free aluminum sulfate and superfine activated white carbon black, specifically as follows:

[0049] (1) Dilute 170g of sodium hydroxide to a 35% aqueous solution and add it to the reactor, then add 1000g of bauxite powder, and react for 3 hours at a pressure of 1.8kgf / cm2 and a temperature of 120°C; filter to obtain a filter residue (about 800g after drying), the filter residue was washed 3 times with 70g water each time, and the liquid obtained by washing was incorporated into the filtrate together.

[0050] (2) 365g of concentrated sulfuric acid is equipped with the aqueous solution of 50% and the filter residue that step (1) obtains is added in the reaction kettle together, under pressure is 2.5kgf / cm 2 , temperature is 6.5 hours under the condition of 190 ℃ of reaction; The pressure of reactor is reduced to normal pressure, under 40 ℃ of conditions, add 3g terminal thiocarbamate...

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Abstract

The invention relates to a method for preparing iron-free aluminum sulfate and ultrafine active white carbon black by using waste sulfuric acid. The method comprises the following steps: preparing ultrafine active white carbon black from a filtrate obtained after a reaction of bauxite with sodium hydroxide; and preparing iron-free aluminum sulfate from a filter residue and waste sulfuric acid. Acidic activated clay is used to remove metal ions in waste sulfuric acid and terminated thiocarbanic acid sodium hyperbranched poly(amine-amine) is used to further remove metal ions in aluminum sulfate so as to obtain iron-free aluminum sulfate with iron content of less than 10 ppm; vinyl-terminated hyperbranched organosilane forms an organic protection layer on the surface of silica so as to allow silica to be easily dispersed and to have a reduced particle size and an increased specific surface area, so a white carbon black product with high silica content and a high grade can be obtained. The method provided by the invention effectively improves the conversion rate of alumina, effectively utilizes waste acid and waste residue to produce white carbon black with a high added value, is beneficial for environmental protection and comprehensive utilization of resources and has the advantages of simple process, low cost, a high added value and suitability for industrial production.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a method for preparing iron-free aluminum sulfate by using waste sulfuric acid and a method for preparing ultrafine activated white carbon black. Background technique [0002] It is known that iron-free aluminum sulfate (the industry standard is that the iron content is less than 50ppm) can be widely used in high-grade papermaking and drinking water purification industries, and has high added value. effective way. A brand-new application field of aluminum sulfate is the field of titanium dioxide. According to statistics, about 5% aluminum sulfate needs to be added as a coating material in the process of producing titanium dioxide, which can effectively reduce the free energy on the surface of titanium dioxide, reduce its agglomeration ability, and improve Dispersion and grade of titanium dioxide. The aluminum sulfate used for titanium dioxide coating has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/74C01B33/18C08K3/36C08K9/10
Inventor 张道洪唐彬海
Owner 杭州百事特实业股份有限公司