Introduction to the production process of solid aluminum sulfate
1 leaching Dorr method of bauxite sulfuric acid at atmospheric pressure (atmospheric reaction method) [3]
The production process of atmospheric leaching of aluminum sulfate by Dorr method is to grind the bauxite up to 80% and over 200 mesh, feed it into the silo, and then put 98% sulfuric acid into the high tank.Reactor no. 1, reactor no. 2, and reactor no. 3 are connected, lined with lead and heated with steam.At a near-boiling temperature, and from there into reactor no. 2 and reactor no. 3, the reaction tends to be complete.The mixture from the reactor is fed into several thickeners operated in series countercurrent operations to remove the insoluble residue, while at the same time being thoroughly rinsed, the clarified aluminum sulfate solution is poured in and out of the evaporator for concentration, and then cooled to crystallize.
2 pressure reaction method of bauxite sulphuric acid [1]
The bauxite was crushed to 60 mesh and reacted with 55% ~ 60% sulfuric acid in the reactor for 6 ~ 8h under pressure. The crude reaction solution was separated by sedimentation, evaporation and concentration, and the clarification solution was neutralized with acid or slightly alkaline. Then the product was crushed and screened after cooling and solidification.Domestic at present use this method more.
3 aluminum hydroxide decomposition with sulfuric acid [1]
Aluminum hydroxide reacts with sulfuric acid, the reaction liquid is precipitated, concentrated, cooled and solidified, and then broken and sifted to produce aluminum sulfate.This method is the same as the preparation of liquid aluminum sulfate.
In addition, some manufacturers make comprehensive use of waste resources and turn waste into valuable products to produce aluminum sulfate. For example, kaolin method [4] produces aluminum sulfate from waste material of aluminum ingots and waste sulfuric acid lotion [16], providing a new method for aluminum sulfate production and a new idea for researchers.
Two, iron removal process
1. Recrystallization method for iron removal [5]
Recrystallization method in addition to iron is a good method and its basic principle is: under the high temperature, acid acidification iron (with Fe2O3) for about 0.45% of the industrial aluminum sulfate into saturated solution, then cooled to a certain temperature crystallization, without separation of crystal and then heated to a certain temperature, crystal partly dissolved at this time, in the condition of the constant temperature time (called the recrystallization of the time), the purpose is to make the impurity in the crystal dissolution in full.The solution containing the crystals is then cooled again to the supersaturated state to form recrystallized seeds. This process is repeated several times as required to produce crystals of aluminum sulfate containing less than 0.04% iron.
2. Organic solvent extraction [6]
According to the process flow of this method, after the aluminum sulfate solution was oxidized by H2O2, the 260# sulfonated kerosene solution containing 20% (mass fraction) N1923 was added to extract and remove iron. The solvent did not extract the aluminum, and the water phase was obtained as the aluminum sulfate solution with almost no iron, and the refined aluminum sulfate was obtained by concentrating.The organic phase can be recovered by adding dilute sulfuric acid.
3. Organic complexation precipitation method [7]
Principle and process flow of the method: add 36.3g 40% (mass fraction) diamino compound into the reaction bottle, then add 15% (mass fraction) KOH solution 86g, cool to 10 ~ 20℃, drop another compound 24.5g.The drop acceleration should be controlled at a temperature not exceeding 20℃ (approximately 2 h).After dripping, the temperature was increased to 40 ~ 50℃, and the reaction continued for 0.5 ~ 1.0 h.The precipitant solution of about 30% (mass fraction) was prepared. The precipitant could be used directly without crystallization.
Said take 100 g preparation good aluminium sulphate, its soluble in 130 ~ 150 ml water, at room temperature, to join the mass fraction of 30% precipitation containing organic complexing agent 4 ~ 6 g precipitant aqueous solution, stirring evenly, namely with brown precipitate out, filter to remove precipitation, vacuum concentration, crystallization mother liquor white solid Al2 (SO4) 3, by the analysis of iron ion mass fraction is 0.003% ~ 0.007%.
production process of solid aluminum sulfate Related Video:
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