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Method for preparing sodium stannate from oxide slag and anode slime produced during the production of stannous sulfate

A technology of stannous sulfate and oxide slag, applied in chemical instruments and methods, tin compounds, inorganic chemistry and other directions, can solve the problems of low content of refined tin impurities and high production costs, save energy, improve recovery rate and reduce production costs Effect

Active Publication Date: 2015-11-04
GUANGXI HUAXI GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When refined tin is used as raw material to produce sodium stannate, due to the low impurity content of refined tin, the intermediate impurity removal process is relatively simple, and it is easy to produce high-quality products, but the production cost is relatively high

Method used

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  • Method for preparing sodium stannate from oxide slag and anode slime produced during the production of stannous sulfate
  • Method for preparing sodium stannate from oxide slag and anode slime produced during the production of stannous sulfate

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Effect test

Embodiment 1

[0032] First, the stannous sulfate oxide slag and anode slime are placed in W Na2CO3 :W SO4 2- =1.10, solid-to-liquid ratio=1:3, reaction time is 60 min, and reaction temperature is 60°C to remove sulfate radicals to obtain oxide slag and anode slime low sulfate radical materials with sulfate radical content of 0.098%. Then these low sulfate content oxide slag, anode slime and NaOH, NaNO 3 、H 2 O is mixed according to the ratio of 1: 1: 2: 0.45: 5, and the oxidation reaction is carried out at 300°C for 45 minutes to generate sodium stannate and ammonia gas. React for 60 min to convert metal tin into sodium stannate as much as possible, and let excess NaNO 3 Decomposition gives crude sodium stannate. Crude sodium stannate was dissolved in hot water at a liquid-solid ratio of 5:1 for leaching to obtain a crude sodium stannate leaching solution with high impurities, and then the solution temperature was 60°C, the reaction time was 60min, and the stirring speed was 20r / min. ...

Embodiment 2

[0034] First, the stannous sulfate oxide slag and anode slime are placed in W Na2CO3 :W SO4 2- =1.18, solid-to-liquid ratio=1:3, reaction time is 90 min, and reaction temperature is 72°C for sulfate removal, to obtain oxide slag and anode slime low-sulfate materials with sulfate content of 0.093%. Then these low sulfate content oxide slag, anode slime and NaOH, NaNO 3 、H 2 O is mixed according to the ratio of 1: 1: 2.20: 0.55: 5, and the oxidation reaction is carried out at 350 ° C for 75 minutes to generate sodium stannate and ammonia gas. React for 100 min to convert metal tin into sodium stannate as much as possible, and let excess NaNO 3 Decomposition gives crude sodium stannate. Crude sodium stannate is dissolved in hot water at a liquid-solid ratio of 5:1 for leaching to obtain a crude sodium stannate leaching solution with high impurities, and then the solution temperature is 75°C, the stirring speed is 25r / min, and the reaction time is 75min. Under the conditions...

Embodiment 3

[0036] First, the stannous sulfate oxide slag and anode slime are placed in W Na2CO3 :W SO4 2- =1.2, solid-to-liquid ratio=1:3, reaction time 120min, reaction temperature 100°C for sulfate removal, to obtain oxidized slag and anode slime low-sulfate materials with sulfate content of 0.089%. Then these low sulfate content oxide slag, anode slime and NaOH, NaNO 3 、H 2 O is mixed according to the ratio of 1: 1: 2.25: 0.6: 5, and the oxidation reaction is carried out at 400°C for 90 minutes to generate sodium stannate and ammonia gas. After the water in the reactant is evaporated to dryness, it is calcined at 1000°C. In-depth reaction for 120 min to convert metal tin into sodium stannate as much as possible, and let excess NaNO 3 Decomposition gives crude sodium stannate. Crude sodium stannate is dissolved in hot water at a liquid-solid ratio of 5:1 for leaching to obtain a crude sodium stannate leaching solution with high impurities, and then the solution temperature is 80°C...

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Abstract

The invention relates to a sodium stannate preparation method, and particularly relates to a method for preparing sodium stannate from oxidizing slag and anode sludge generated during stannous sulfate production. The method comprises the following steps: placing oxidizing slag and anode sludge generated during stannous sulfate production into a sodium carbonate solution to perform sulfate radical removal reaction, thus obtaining a low-sulfate-radical material; performing synthesis reaction on the low-sulfate-radical material with sodium hydroxide, sodium nitrate and water, thus obtaining crude sodium stannate; and dissolving the crude sodium stannate in water, leaching to remove impurities, and concentrating to crystallize the solution subjected to impurity removal. According to the invention, the oxidizing slag and the anode sludge are used as the raw materials for the preparation of sodium stannate, so that the process of processing refined stannum in a stannum smelting plant and then producing sodium stannate is avoided, the recovery rate of the stannum metal is improved, the comprehensive utilization of the stannum metal material in a company is realized, and the energy is saved. Besides, the production process and equipment are simple and easy to implement, the sodium stannate production cost is greatly lowered, and the green recycling of the stannum metal among subcompanies is realized.

Description

technical field [0001] The invention relates to a method for preparing sodium stannate, in particular to a method for preparing sodium stannate by utilizing oxidation slag and anode slime produced during the production of stannous sulfate. Background technique [0002] The traditional method of producing sodium stannate is to use refined tin as raw material. Using refined tin as a raw material to produce tin salt is that refined tin reacts with alkali in the presence of an oxidizing agent to convert it into crude sodium stannate, and the obtained crude tin sodium is then obtained by leaching, impurity removal, concentrated crystallization, and drying to obtain stannic acid sodium products. When refined tin is used as raw material to produce sodium stannate, due to the low impurity content of refined tin, the intermediate impurity removal process is relatively simple, and it is easy to produce high-quality products, but the production cost is relatively high. However, using...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/00
Inventor 叶有明阮桦李达彬林家伟农永萍黄献勇谢丹丹赵鹏凌宏光王运龙
Owner GUANGXI HUAXI GRP CO LTD
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