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Method for deeply purifying sodium stannate liquor

A deep purification, sodium stannate technology, applied in chemical instruments and methods, tin compounds, inorganic chemistry, etc., to achieve the effect of improving chemical activity

Inactive Publication Date: 2012-09-19
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to solve the problem that As, Sb, Pb and other impurity elements are easy to exceed the standard when producing sodium stannate with tin-containing materials or tin secondary resources (As, Sb, Pb>10ppm), to provide a A method for deep removal of As, Pb, Sb and other impurity elements from the mother liquor of sodium stannate in the process of producing sodium stannate from tin secondary resources as raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Firstly, 5 g of CaO was placed in a ball milling jar for ball milling activation, so that the average particle size of CaO reached 0.5 μm. After that, weigh 120g tin electrolytic anode slime (Sn 81%, Pb 0.8%, As 0.1%) and 70g NaOH, 20gNaNO 3 and 5g of ball-milled activated CaO were mixed, and the ball-milled activation was continued for 3 minutes. Afterwards, 20ml of distilled water was mixed with the above mixture and stirred evenly. The homogeneously mixed material was matured at 250°C for 10 minutes. After the aging, add 50ml of distilled water to stir the aging material evenly, then raise the temperature of the material to 800°C and keep it warm for 60min. After the reaction, the material was immersed in distilled water at a temperature of 60° C. for 30 minutes at a liquid-solid ratio (volume (ml) / mass (g)) of 4:1. After the water immersion reaction is finished, liquid-solid separation is carried out, and the obtained solution is evaporated, concentrated and crys...

Embodiment 2

[0049] Firstly, 20g of BaO and 30g of MgO are placed in a ball milling jar for ball milling activation, so that the average particle size reaches 0.3 μm. After that, weigh 1000g crude tin (Sn 98%, Pb 1.4%, As 0.2%) and 600g NaOH, 180gNaNO 3 Mix with impurity remover (20gBaO and 30g MgO) after ball milling activation, and continue ball milling activation for 10min. Afterwards, 200ml of sodium stannate crystallization mother liquor (Sn85g / L, As0.08g / L, Pb0.06g / L, Sb0.04g / L) was mixed with the above mixture and stirred evenly. The homogeneously mixed material was matured at 280°C for 15 minutes. After the aging, add 420ml of distilled water to stir the aging material evenly, then raise the temperature of the material to 870°C and keep it warm for 90min. After the reaction, the material was immersed in distilled water at a temperature of 50° C. for 50 minutes at a liquid-solid ratio (volume (ml) / mass (g)) of 5:1. After the water immersion reaction is finished, liquid-solid sepa...

Embodiment 3

[0051] 3g of ZnO was placed in a ball mill jar for ball milling activation, so that the average particle size of ZnO reached 0.8 μm. After that, weigh 100g tin dross (Sn 89%, Pb 0.6%, As 0.12%) and 65g NaOH, 18g NaNO 3 and 3g of ZnO activated by ball milling, and continue ball milling for 2 minutes. Afterwards, 30ml of sodium stannate crystallization mother liquor was mixed with the above-mentioned mixture and stirred evenly. The homogeneously mixed material was matured at 180°C for 5 minutes. After the aging, add 40ml of distilled water to stir the aging material evenly, then raise the temperature of the material to 600°C and keep it warm for 60min. After the reaction, the material was immersed in distilled water at a temperature of 80° C. for 30 minutes at a liquid-solid ratio (volume (ml) / mass (g)) of 6:1. After the water immersion reaction, liquid-solid separation was carried out, and the obtained solution was evaporated, concentrated and crystallized, and the crystalli...

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Abstract

The invention discloses a method for deeply purifying sodium stannate liquor. The method includes realizing ball-milling and activation for a refining agent, then proportionally mixing materials containing tin, NaOH, NaNO3 and the activated refining agent, adding and uniformly mixing distilled water or sodium stannate crystallization mother liquor with the mixture, and curing materials uniformly mixed; adding and uniformly stirring distilled water with the materials after the materials are cured; heating the material to a certain temperature and enabling the materials to react sufficiently; and adding the reacted materials into distilled water to carry out water immersion reaction; separating liquid from solid to obtain liquor after the water immersion reaction is completed, and evaporating, concentrating and crystallizing the obtained liquor to obtain a high-purity sodium stannate product. The crystallization mother liquor can be recycled for mixed materials after the high-purity sodium stannate product is obtained. The content of sodium stannate in the sodium stannate product is higher than 99.995%, and contents of impurity elements such as As, Sb and Pb are lower than 10ppm. The method for preparing the high-purity sodium stannate product has the advantages that raw material sources are wide, cost is low, tin recovery rate is high, the quality of the product is good, and the like.

Description

technical field [0001] The invention relates to the field of deep processing of nonferrous metal products, in particular to a method for deeply removing impurity elements such as arsenic, antimony and lead in sodium stannate solution. Background technique [0002] Using tin-containing materials, especially tin secondary resources such as tin anode slime and tin slag, as raw materials, the sodium stannate solution prepared by the oxidation alkali solution often contains a certain amount of impurity elements such as Sb, As, and Pb, and These impurity elements are often represented by SbO 3 3- , SbO 4 3- , SbO 2 - , PbO 2 2- and AsO 4 2- , AsO 2 - Forms such as exist in the sodium stannate solution of high alkalinity; The reaction equation of this oxidation alkali dissolution method is as follows: [0003] SnO 2 +2NaOH=Na 2 SnO 3 +H 2 O (1) [0004] 5Sn+6NaOH+4NaNO 3 =5Na 2 SnO 3 +2N 2 +3H 2 O (2) [0005] Sb 2 o 3 +6NaOH=2Na 3 SbO 3 +3H 2 O (3) [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/00
Inventor 杨建广张绪亮刘小文邓自祥何静杨声海陈永明
Owner CENT SOUTH UNIV
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