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Method for preparing magnesium sulfate and magnesium silico calcium sulfur fertilizer by utilizing alkylated waste sulfuric acid

A technology for alkylating waste sulfuric acid and magnesium sulfate, which is applied in the direction of magnesium sulfate, can solve the problems of small particles and high activity, and achieve the effect of simple process, less investment in equipment, and no secondary pollution

Inactive Publication Date: 2014-09-03
TIANJIN UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium sulfate waste residue is rich in silicon, calcium, magnesium, and sulfur, and the particles are small and highly active. However, there is no technology to use magnesium sulfate waste residue to produce silicon calcium sulfur magnesium fertilizer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of method utilizing alkylation waste sulfuric acid to produce magnesium sulfate and silicon calcium sulfur magnesium fertilizer, the steps are as follows:

[0019] 1) Preheat 4500kg of 90wt% alkylation waste sulfuric acid to 65°C through a heat exchanger, and send it to a 5m3 sulfuric acid metering tank, and put 10m3 of water and 5000kg of magnesia containing 22wt% magnesium oxide into a 30m3 reactor Magnesium ore powder, then slowly add the preheated alkylation waste sulfuric acid into the reactor and make the reaction temperature reach 95°C when no bubbles are produced, then add 700 kg of 90wt% lightly burned powder to react until the pH is 6.8, and obtain mixed solution;

[0020] 2) Stir the above mixed solution for 30 minutes and then filter, press filter to separate the primary mother liquor and primary waste residue, move the primary mother liquor to a 30m3 refining kettle, add 30 kg of sodium hypochlorite and 50 kg of activated carbon and stir for decolori...

Embodiment 2

[0023] A kind of method utilizing alkylation waste sulfuric acid to produce magnesium sulfate and silicon calcium sulfur magnesium fertilizer, the steps are as follows:

[0024] 1) Preheat 4,700kg of 88wt% alkylated waste sulfuric acid to 70°C through a heat exchanger, and send it to a 5m3 sulfuric acid metering tank, and put 10m3 of water and 4,000kg of magnesia containing 22wt% magnesium oxide into a 30m3 reactor Magnesium ore powder, then slowly add the preheated alkylation waste sulfuric acid into the reactor and make the reaction temperature reach 95°C when no bubbles are produced, then add 950 kg of 90wt% lightly burned powder to react until the pH is 6.9, and obtain mixed solution;

[0025] 2) Stir the above mixed solution for 30 minutes and then filter, press filter to separate the primary mother liquor and primary waste residue, move the primary mother liquor to a 30m3 refining kettle, add 20 kg of sodium hypochlorite and 80 kg of activated carbon and stir for decolor...

Embodiment 3

[0028] A kind of method utilizing alkylation waste sulfuric acid to produce magnesium sulfate and silicon calcium sulfur magnesium fertilizer, the steps are as follows:

[0029] 1) Preheat 4,300 kg of 91 wt% alkylated waste sulfuric acid to 75°C through a heat exchanger, and send it to a 5m3 sulfuric acid metering tank, and put 10m3 of water and 4,500 kg of magnesia containing 21wt% magnesium oxide into a 30m3 reactor Magnesium ore powder, then slowly add the preheated alkylation waste sulfuric acid into the reactor and make the reaction temperature reach 95°C when no bubbles are produced, then add 920 kg of 90wt% lightly burned powder to react until the pH is 7.0, and obtain mixed solution;

[0030] 2) Stir the above mixed solution for 30 minutes and filter, press filter to separate the primary mother liquor and primary waste residue, move the primary mother liquor to a 30m3 refining kettle, add 60 kg of sodium hypochlorite and 100 kg of activated carbon and stir for decolori...

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Abstract

The invention discloses a method for preparing magnesium sulfate and a magnesium silico calcium sulfur fertilizer by utilizing alkylated waste sulfuric acid. The method comprises the steps of consuming sulfuric acid by producing magnesium sulfate, adsorbing and separating acid-soluble oil waste residues by virtue of suspended matters of silicon, calcium and the like in a mineral powder, calcining the waste residues by virtue of an external heat source with the assistance of the heat of oil-containing residues and the heat of waste activated carbon, carbonizing an organic matter, and preparing the fertilizer containing magnesium silico calcium sulfur. The method has the beneficial effects that the method is simple in process and easy to operate, is easy to implement, is little in equipment investment, is low in the cost, is large in the market need for the magnesium silico calcium sulfur fertilizer as a by-product and is remarkable in the economic and social benefits without secondary pollution. With the adoption of the method, all resources are used in an optimization way, so that the method is an ideal process for treating the alkylated waste sulfuric acid with low cost.

Description

technical field [0001] The invention relates to the treatment of waste sulfuric acid, in particular to a method for producing magnesium sulfate and silicon-calcium-sulfur-magnesium fertilizer by using alkylated waste sulfuric acid. Background technique [0002] With the improvement of international requirements for fuel oil, the output of isooctane produced by alkylation has increased rapidly. The production of isooctane per ton needs to consume 50-60 kg of 98wt% sulfuric acid, and discharge about 90% of waste sulfuric acid. The domestic only isooctane Alkane waste sulfuric acid exceeds 500,000 tons per year. Because waste sulfuric acid contains a large amount of organic matter, the existing treatment technology is mainly to crack and regenerate sulfuric acid for reuse. The investment in equipment is huge, and the cost of treating each ton of waste sulfuric acid is extremely high and the loss is huge, which brings great impact on the cost of production enterprises and the en...

Claims

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Application Information

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IPC IPC(8): C01F5/40C05D11/00
Inventor 李梅彤张柯贺文珠王勇民杨刚范文浩
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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