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

Examples

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Effect test

Embodiment 1

[0023] refer to figure 1 , a method for preparing manganese sulfate, manganese nitrate and calcium sulfate, its raw material is waste liquid and manganese ore obtained by producing titanium dioxide by sulfuric acid process, comprising the following specific steps:

[0024] Step A: Take 500kg of the waste liquid produced by the sulfuric acid method to produce titanium dioxide, adjust the mass concentration of the sulfuric acid contained therein to 18%, grind the square manganese into a 150-mesh coarse powder, and put the waste liquid obtained by the sulfuric acid method into a heated The soaking tank (1) of the device is soaked for 10 hours, and the soaking temperature is 80° C., and the soaking liquid is filtered through the suction filter (2) to obtain clarified filtrate and filter residue;

[0025] Step B: adding manganese hydroxide to the clarified filtrate to remove impurities, and filtering to obtain a pure manganese sulfate solution;

[0026] Step C: send pure manganese...

Embodiment 2

[0031] refer to figure 1 , a method for preparing manganese sulfate, manganese nitrate and calcium sulfate, its raw material is waste liquid and manganese ore obtained by producing titanium dioxide by sulfuric acid process, comprising the following specific steps:

[0032] Step A: Take 500kg of the waste liquid obtained by the production of titanium dioxide by the sulfuric acid method, adjust the mass concentration of the sulfuric acid contained therein to 20%, grind the square manganese into 100 mesh coarse powder, and put it into a heating tank together with the waste liquid obtained by the production of titanium dioxide by the sulfuric acid method The soaking tank (1) of the device is soaked for 8 hours, and the soaking temperature is 60° C., and the soaking liquid is filtered through the suction filter (2) to obtain clarified filtrate and filter residue;

[0033] Step B: adding manganese hydroxide to the clarified filtrate to remove impurities, and filtering to obtain a pu...

Embodiment 3

[0039] refer to figure 1, a method for preparing manganese sulfate, manganese nitrate and calcium sulfate, its raw material is waste liquid and manganese ore obtained by producing titanium dioxide by sulfuric acid process, comprising the following specific steps:

[0040] Step A: Take 500kg of the waste liquid obtained by the production of titanium dioxide by the sulfuric acid method, adjust the mass concentration of the sulfuric acid contained therein to 30%, grind the square manganese into 120 mesh coarse powder, and put it into a heating tank together with the waste liquid obtained by the production of titanium dioxide by the sulfuric acid method The soaking tank (1) of the device is soaked for 9 hours, and the soaking temperature is 70° C., and the soaking liquid is filtered through the suction filter (2) to obtain clarified filtrate and filter residue;

[0041] Step B: adding manganese hydroxide to the clarified filtrate to remove impurities, and filtering to obtain a pur...

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Abstract

The invention provides a method for preparing manganese sulfate, manganous nitrate and calcium sulfate. The method comprises the following steps of: grinding manganosite into coarse powder, soaking titanium dioxide which is produced by a sulfuric acid method at the temperature of between 60 and 80 DEG C for 8 to 10 hours, and suction-filtering to obtain the clarified filtrate, and adding manganic hydroxide to remove impurity to obtain the purified solution of manganese sulfate; performing reduced pressure distillation on the purified solution of manganese sulfate to obtain the saturated solution of manganese sulfate, cooling, separating manganese sulfate crystal containing crystal water out, and drying and crushing to obtain a manganese sulfate crystal product; reacting the purified solution of manganese sulfate and solution of calcium nitrate with stirring, filtering reaction products to obtain a calcium sulfate filter cake and manganous nitrate filtrate; and performing reduced pressure distillation on the manganous nitrate filtrate to obtain the saturated solution of manganous nitrate, cooling and crystallizing to obtain manganous nitrate hydrate, drying and crushing to obtain a manganous nitrate crystal product; and washing, drying and crushing the calcium sulfate filter cake to obtain a dihydrate calcium sulphate product.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of inorganic chemical industry wastes, in particular to a method for preparing manganese sulfate, manganese nitrate and calcium sulfate. The raw materials are waste liquid and manganese ore obtained by producing titanium dioxide by a sulfuric acid method. Background technique [0002] The production of titanium dioxide by the sulfuric acid method is to produce titanium dioxide sulfate by acidolysis reaction of ferrotitanium powder and concentrated sulfuric acid, which is hydrolyzed to generate metatitanic acid, and then calcined and pulverized to obtain titanium dioxide products. The chemical reaction principle is as follows: [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 ...

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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