Method for preparing manganese sulfate by reduction leaching of manganese ore using discard molasses and sulfuric acid

A technology of manganese sulfate and waste molasses, applied in the direction of manganese sulfate and the like, can solve the problems of high reaction temperature, unsatisfactory reducing agent, difficulty in hydrolysis into sugar, etc., and achieves the effects of mild reaction conditions, less inorganic impurities and improved yield

Inactive Publication Date: 2006-12-27
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to hydrolyze plant powder into sugar, which requires a higher reaction temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]Manganese ore is pulverized to 100 orders (composition is as shown in table 2), prepares ore pulp with the water of 4 times of manganese ore quality; Adding 0.7 times of manganese ore quality concentration is the waste molasses of 98% sulfuric acid and manganese ore quality 0.2 times in ore pulp (composition is as follows shown in Table 1), stirred and reacted for 2 hours at a temperature of 95° C. to obtain a reaction leaching solution. The reaction leaching solution was neutralized with limestone to a pH value of 5.8, and then at a temperature of 70°C, a 3% concentration of pyrolusite mass was added to a 0.5mol / L ammonium sulfide solution to make Cu 2+ 、Ni 2+ , Zn 2+ 、Co 2+ Wait for heavy metal ions to generate sulfide precipitates and remove them, let stand for 20 hours, and filter. Add filtrate Ca to filtrate 2+ , Mg 2+ The concentration of 2.4 times the total molar number of ions is 1mol / L ammonium fluoride solution, so that Ca 2+ , Mg 2+ Ion generation CaF ...

Embodiment 2

[0029] Manganese ore is pulverized to 200 orders (composition is as shown in table 2), prepares ore pulp with the water of 10 times of manganese ore quality; Adding 0.9 times of manganese ore quality concentration is the waste molasses of 98% sulfuric acid and manganese ore quality 0.1 times in ore pulp (composition is as follows shown in Table 1), stirred and reacted for 3 hours at a temperature of 100° C. to obtain a reaction leaching solution. The reaction leaching solution is neutralized with limestone to a pH value of 5.7, and then at a temperature of 80° C., 2% concentration of pyrolusite mass is added to a 0.5 mol / L ammonium sulfide solution to make Cu 2+ 、Ni 2+ , Zn 2+ 、Co 2+ Wait for heavy metal ions to generate sulfide precipitates to remove, let stand for 24 hours, and filter. Add filtrate Ca to filtrate 2+ , Mg 2+ The concentration of 2.3 times the total molar number of ions is 1mol / L ammonium fluoride solution, so that Ca 2+ , Mg 2+ Ion generation CaF 2 , ...

Embodiment 3

[0031] Manganese ore is pulverized to 40 orders (composition is as shown in table 2), prepares ore slurry with the water of 2 times of manganese ore quality; Adding 0.7 times of manganese ore quality concentration is the waste molasses of 98% sulfuric acid and manganese ore quality 0.35 times in ore slurry (composition is as follows shown in Table 1), stirred and reacted for 5 hours at a temperature of 40° C. to obtain a reaction leaching solution. The reaction leaching solution was neutralized with limestone to a pH value of 5.5, and then at a temperature of 70°C, 3% concentration of pyrolusite mass was added to a 0.5mol / L ammonium sulfide solution to make Cu 2+ 、Ni 2+ , Zn 2+ 、Co 2+ Wait for heavy metal ions to generate sulfide precipitates and remove them, let stand for 12 hours, and filter. Add filtrate Ca to filtrate 2+ , Mg 2+ The concentration of 2 times the total number of moles of ions is 1mol / L ammonium fluoride solution, so that Ca 2+ , Mg 2+ Ion generation C...

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Abstract

The invention discloses a new preparing method of manganese sulfate through manganese oxide in the manganese ore in the leaching manganese ore extracting and manufacturing technological domain, which comprises the following steps: grinding manganese ore; moulding ore paste through water; adding sulfuric acid and waste molasses in the ore paste; stirring at 40-100 deg.c to obtain leaching liquid; neutralizing the leaching liquid through limestone; adding ammonia sulfate to remove heavy metal ion; adding ammonium fluoride solution to remove Ca2+, Mg2+; evaporating; condensing; crystallizing; drying to produce manganese sulfate with over 98 percent purity and 93 percent manganese collecting rate.

Description

Technical field: [0001] The invention relates to a method for producing manganese sulfate, in particular to a method for preparing manganese sulfate by leaching manganese ore with sulfuric acid by using waste molasses as a reducing agent. Background technique: [0002] Sucrose is made from sugarcane or sugar beet, while molasses is a by-product of the sugar production process, which is rich in reducing substances such as sugar. For example, sugarcane waste molasses contains: 25% to 35% of sucrose, 15% to 25% of invert sugar, 9% to 11% of colloid, and other organic reducing substances and ash. Beet molasses contains about 40% sucrose and about 10% other sugars. In the process of sucrose production, waste molasses is about 3% of the weight of sugarcane, and the by-product of waste molasses is more than 2 million tons in my country every year. Therefore, waste molasses is a renewable resource with abundant sources and low price. [0003] Manganese ore containing manganese di...

Claims

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Application Information

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IPC IPC(8): C01G45/10
Inventor 粟海锋文衍宣童张法韦藤幼黄映恒
Owner GUANGXI UNIV
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