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Dolomite wet process comprehensive utilization technique

A dolomite and wet process technology, applied in the direction of magnesium oxide, magnesium hydroxide, magnesium chloride, etc., can solve the problems of narrow application range of dolomite powder, difficult recycling of intermediate products, environmental pollution, etc., to achieve flexible and adjustable product solutions, environmental protection Significant benefits and significant economic benefits

Inactive Publication Date: 2010-06-02
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the dolomite powder obtained by the direct pulverization method has a narrow application range and can only be used as a low-end filler in rubber; the carbonization method and acid hydrolysis method can produce basic magnesium carbonate, magnesium hydroxide and magnesium oxide, which are widely used in rubber, Plastics, coatings, adhesives, food, medicine, environmental protection and other industries, but these methods generally have the disadvantages of high energy consumption, certain environmental pollution or the difficulty of recycling intermediate products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Take 100g of dolomite powder crushed to 200 mesh, put it in a 2000mL acid leaching tank, add 400g of 30% dilute sulfuric acid, keep the temperature at 50°C, and carry out acid leaching under stirring. After 4 hours, the acid leaching is completed, the suspension is filtered, and the filter cake is dried and crushed to obtain primary calcium sulfate product. Filtrate is magnesium sulfate solution;

[0029] (2) Place the magnesium sulfate solution obtained in step (1) in a 2000mL reaction tank, slowly add 320g of calcium chloride solution with a concentration of 20% at 30°C under stirring, and add dropwise for 2h. Continue to stir for 30 minutes after the dropwise addition, filter, wash and dry the filter cake to obtain secondary calcium sulfate product. Filtrate is magnesium chloride solution;

[0030] (3) Place the magnesium chloride solution obtained in step (2) in a 2000mL reaction tank, and slowly add 210g of milk of lime with a concentration of 20% under condi...

Embodiment 2

[0032] (1) Take 100g of dolomite powder crushed to 100 mesh, put it in a 2000mL acid leaching tank, add 1200g of dilute sulfuric acid with a concentration of 10%, keep the temperature at 30°C, and carry out acid leaching under stirring. After 5 hours, the acid leaching is completed, the suspension is filtered, and the filter cake is dried and crushed to obtain primary calcium sulfate product. Filtrate is magnesium sulfate solution;

[0033] (2) Place the magnesium sulfate solution obtained in step (1) in a 2000mL reaction tank, slowly add 130g of calcium chloride solution with a concentration of 50% at 60°C under stirring, and add dropwise for 2h. Continue to stir for 30 minutes after the dropwise addition, filter, wash and dry the filter cake to obtain secondary calcium sulfate product. Filtrate is magnesium chloride solution;

[0034] (3) Place the magnesium chloride solution obtained in step (2) in a 2000mL reaction tank, and slowly add 410g of milk of lime with a concent...

Embodiment 3

[0036] (1) Take 100g of dolomite powder crushed to 325 mesh, put it in a 2000mL acid leaching tank, add 400g of 30% dilute sulfuric acid, keep the temperature at 50°C, and carry out acid leaching under stirring. After 4 hours, the acid leaching is completed, the suspension is filtered, and the filter cake is dried and crushed to obtain primary calcium sulfate product. Filtrate is magnesium sulfate solution;

[0037] (2) Place the magnesium sulfate solution obtained in step (1) in a 2000mL reaction tank, slowly add 320g of calcium chloride solution with a concentration of 20% at 30°C under stirring, and add dropwise for 2h. Continue to stir for 30 minutes after the dropwise addition, filter, wash and dry the filter cake to obtain secondary calcium sulfate product. Filtrate is magnesium chloride solution;

[0038] (3) Place the magnesium chloride solution obtained in step (2) in a 2000mL reaction tank, and slowly add 210g of milk of lime with a concentration of 20% under condi...

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Abstract

The invention discloses a process of wet comprehensive utilization of dolomite, more specifically relates to a process for wet treatment of the dolomite to produce calcium and magnesium products, namely, the dolomite or incinerated dolomite powder is directly leached with sulfate acid to separate the calcium and the magnesium in the dolomite. The calcium precipitates in the form of calcium sulfateand the magnesium enters a solution in the form of magnesium sulfate; then magnesium hydroxide and calcium sulfate products are prepared from the magnesium solution after metathetical reaction and neutralization reaction. The intermediate product, calcium chloride, of the invention can be recycled, so the process is basically free of three-waste discharge and has notable environmental benefit; the invention, besides, significantly lowers the resource consumption and has obvious economic benefit.

Description

technical field [0001] The invention relates to a dolomite wet-process comprehensive utilization process, in particular to a process for wet-processing dolomite to produce calcium and magnesium products. Background technique [0002] Dolomite is a calcium-magnesium composite non-metallic mineral, the main components are calcium carbonate and magnesium carbonate, and it is one of the important raw materials for the preparation of calcium-magnesium products. my country is very rich in dolomite resources, with proven reserves of more than 4 billion tons nationwide, distributed in Liaoning, Jilin, Hebei and other provinces and cities. [0003] At present, the utilization methods of dolomite mainly include direct crushing method, carbonization method, acid hydrolysis method and so on. Among them, the dolomite powder obtained by the direct pulverization method has a narrow application range and can only be used as a low-end filler in rubber; the carbonization method and acid hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40C01F11/46C01F5/30C01F5/14C01F5/22C01F5/08
Inventor 刘宝树胡庆福胡永琪刘润静
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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