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Method for preparing manganese sulfate, manganese nitrate and calcium sulfate

A technology of manganese nitrate and manganese sulfate, applied in the direction of manganese nitrate, manganese sulfate, calcium/strontium/barium sulfate, etc., can solve the problems of impurity enrichment, harsh material requirements, and difficult separation of ferrous sulfate, and achieve simple operation, The effect of less investment in equipment

Inactive Publication Date: 2011-11-23
王莉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

About 10 tons of waste residue with a mass percent concentration of sulfuric acid of 10-25% is discharged for every ton of titanium dioxide produced. These waste residues can be produced by concentrated circulation process, but there are high energy consumption and demanding materials used. Sulfuric acid Fatal problems such as difficulty in ferrous separation and enrichment of impurities during recovery
At present, there is no better way to solve the problem of waste acid treatment and utilization of titanium dioxide

Method used

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  • Method for preparing manganese sulfate, manganese nitrate and calcium sulfate
  • Method for preparing manganese sulfate, manganese nitrate and calcium sulfate

Examples

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Effect test

Embodiment 1

[0023] Reference figure 1 , A method for preparing manganese sulfate, manganese nitrate and calcium sulfate, whose raw materials are waste liquid and manganese ore obtained from the production of titanium dioxide by the sulfuric acid method, including the following specific steps:

[0024] Step A: Take 500kg of waste liquid obtained from the production of titanium dioxide by the sulfuric acid method, adjust the mass concentration of sulfuric acid contained therein to 18%, grind the peridotite into a coarse powder of 100 mesh, and put the waste liquid obtained from the production of titanium dioxide by the sulfuric acid method together with heating The soaking tank (1) of the device is soaked for 8 hours at a soaking temperature of 60°C, and the soaking liquid is filtered through a suction filter (2) to obtain a clear filtrate and filter residue;

[0025] Step B: Add manganese hydroxide to the clarified filtrate to remove impurities and filter to obtain a pure manganese sulfate solu...

Embodiment 2

[0031] Reference figure 1 , A method for preparing manganese sulfate, manganese nitrate and calcium sulfate, whose raw materials are waste liquid and manganese ore obtained from the production of titanium dioxide by the sulfuric acid method, including the following specific steps:

[0032] Step A: Take 500kg of the waste liquid obtained from the production of titanium dioxide by the sulfuric acid method, adjust the mass concentration of sulfuric acid contained therein to 20%, grind the peridotite into a coarse powder of 120 mesh, and put the waste liquid obtained from the production of titanium dioxide by the sulfuric acid method together with heating The soaking tank (1) of the device is soaked for 90 hours at a soaking temperature of 70°C, and the soaking liquid is filtered through a suction filter (2) to obtain a clear filtrate and filter residue;

[0033] Step B: Add manganese hydroxide to the clarified filtrate to remove impurities and filter to obtain a pure manganese sulfate...

Embodiment 3

[0039] Reference figure 1 , A method for preparing manganese sulfate, manganese nitrate and calcium sulfate, whose raw materials are waste liquid and manganese ore obtained from the production of titanium dioxide by the sulfuric acid method, including the following specific steps:

[0040] Step A: Take 500kg of waste liquid from the production of titanium dioxide by the sulfuric acid method, adjust the mass concentration of sulfuric acid contained in it to 30%, grind the peridotite into a coarse powder of 150 mesh, and put it together with the waste liquid from the production of titanium dioxide by the sulfuric acid method with heating The soaking tank (1) of the device is soaked for 10 hours at a soaking temperature of 80°C, and the soaking liquid is filtered through a suction filter (2) to obtain a clear filtrate and filter residue;

[0041] Step B: Add manganese hydroxide to the clarified filtrate to remove impurities and filter to obtain a pure manganese sulfate solution;

[004...

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Abstract

The invention provides a method for preparing manganese sulfate, manganese nitrate and calcium sulfate, and the method comprises: grinding manganosite into coarse powder, soaking the coarse powder in a waste liquid generated in titanium white production utilizing a sulfuric acid method at the temperature of 60-80 DEG C for 8-10 hours, carrying out suction-filtering to obtain a clarified filtrate, and adding manganese hydroxide to remove impurities and obtain a pure manganese sulfate solution; distilling the pure manganese sulfate solution while decompressing to obtain a manganese sulfate saturated solution, cooling and precipitating manganese sulfate crystals containing crystal water, then drying and crushing to obtain a manganese sulfate crystal product; reacting the pure manganese sulfate solution with a calcium nitrate solution under stirring, filtering the reaction product to obtain a calcium sulfate filter cake and a manganese nitrate filtrate, distilling the manganese nitrate filtrate while decompressing to obtain a manganese nitrate supersaturated solution, cooling and crystallizing to obtain manganese nitrate crystals, drying and crushing to obtain a manganese nitrate powder product; and washing the calcium sulfate filter cake, drying and crushing to obtain a calcium sulfate dihydrate product.

Description

Technical field [0001] The invention relates to the technical field of treatment and utilization of the three wastes of inorganic chemical industry, in particular to a method for preparing manganese sulfate, manganese nitrate and calcium sulfate. The raw materials are waste liquid and manganese ore obtained from the production of titanium dioxide by the sulfuric acid method. Background technique [0002] The production of titanium dioxide by the sulfuric acid method is the acid hydrolysis reaction of ferro-titanium powder and concentrated sulfuric acid to produce titanium sulfate, which is hydrolyzed to generate metatitanic acid, and then calcined and crushed to obtain titanium dioxide products. The chemical reaction principle is: [0003] , Fe 2 O 3 +3H 2 SO 4 ==Fe 2 (SO 4 ) 3 +3H 2 O [0004] TiO 2 +2H 2 SO 4 ==Ti(SO 4 ) 2 +2H 2 O [0005] Fe+Fe 2 (SO 4 ) 3 ==3FeSO 4 [0006] Ti(SO 4 ) 2 +3H 2 O==H 2 TiO 3 ↓+2H 2 SO 4 , [0007] H 2 TiO 3 =TiO 2 +H 2 O. [0008] In the ...

Claims

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Application Information

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IPC IPC(8): C01G45/10C01G45/08C01F11/46
Inventor 王嘉兴
Owner 王莉
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