Method for preparing manganese sulfate, manganese hydroxide and calcium sulfate

A technology of manganese hydroxide and manganese sulfate, which is applied in the direction of manganese oxide/manganese hydroxide, manganese sulfate, calcium/strontium/barium sulfate, etc., which can solve problems such as harsh material requirements, enrichment of impurities, and difficulty in separating ferrous sulfate , to achieve the effect of less investment in equipment and simple operation

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

Examples

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Embodiment 1

[0023] refer to figure 1 , a method for preparing manganese sulfate, anhydrous manganese chloride 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 obtained 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 100-mesh coarse powder, and then put the two together into a soaking tank with a heating device (1), soak for 8 hours, the soaking temperature is 60 DEG C, and the soaking liquid is suction filtered through a 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 sulfate solution into u...

Embodiment 2

[0031] refer to figure 1 , a kind of method for preparing manganese sulfate, manganese chloride tetrahydrate and calcium sulfate, its raw material is the waste liquid and manganese ore that produce titanium dioxide gained by sulfuric acid process, comprise following specific steps:

[0032] Step A: Take 500kg of the waste liquid obtained by the sulfuric acid method to produce titanium dioxide, adjust the mass concentration of the sulfuric acid contained therein to 20%, grind the square manganese into a 120-mesh coarse powder, and then put the two together into a soaking tank with a heating device (1), soak for 12 hours, the soaking temperature is 70 DEG C, and the soaking liquid is filtered through a 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 pure manganese sulfate solution;

[0034] Step C: send pure manganese sulfate solution into u...

Embodiment 3

[0039] refer to figure 1, a kind of method for preparing manganese sulfate, manganese chloride tetrahydrate and calcium sulfate, its raw material is the waste liquid and manganese ore that produce titanium dioxide gained by sulfuric acid process, comprise following specific steps:

[0040] Step A: Take 500kg of the waste liquid obtained by the sulfuric acid method to produce titanium dioxide, adjust the mass concentration of the sulfuric acid contained therein to 30%, grind the square manganese into a 150-mesh coarse powder, and then put the two together into a soaking tank with a heating device (1), soak for 15 hours, the soaking temperature is 80 DEG C, and the soaking liquid is filtered through a 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 pure manganese sulfate solution;

[0042] Step C: send pure manganese sulfate solution into un...

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Abstract

The invention provides a method for preparing manganese sulfate, manganese hydroxide and calcium sulfate, which comprises the following steps: pulverizing manganosite into coarse powder, soaking with titanium dioxide produced by a sulfuric acid method at 60-80 DEG C for 8-15 hours, performing suction filtration to obtain a clarified filtrate, adding manganese hydroxide for impurity removal so as to obtain a pure manganese sulfate solution; performing reduced pressure distillation of the pure manganese sulfate solution to obtain a saturated manganese sulfate solution, cooling, precipitating manganese sulfate crystals with crystal water, drying and crushing the manganese sulfate crystals to obtain a manganese sulfate crystal product; allowing the pure manganese sulfate solution to react with a calcium hydroxide solution under stirring, filtering the reaction product to obtain a calcium sulfate filter cake and a manganese hydroxide filtrate, performing reduced pressure distillation of the manganese hydroxide filtrate to obtain a supersaturated manganese hydroxide solution, performing cooling and crystallization to obtain manganese hydroxide crystals, drying and crushing the manganese hydroxide crystals to obtain a manganese hydroxide product; washing, drying, crushing the calcium sulfate filter cake to obtain a dihydrate calcium sulfate 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 hydroxide 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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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/10C01G45/02C01F11/46
Inventor 王嘉兴
Owner 王莉
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