Method for preparing manganese sulfate, manganous nitrate and calcium sulfate

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 ...

Examples

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...

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 ...

Examples

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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