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Method for preparing tin dioxide directly by using tin-electrolyzed anode mud

A technology of tin dioxide and anode slime, applied in tin oxide and other directions, can solve the problems of products easily containing impurities, high equipment requirements, poor working conditions, etc., to achieve environmental protection, wide market applications, and strong market competitiveness. Effect

Active Publication Date: 2015-09-02
熊华亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are two main methods for producing tin dioxide in the domestic industry: the first method is the method of dissolving pure metal tin with nitric acid. The advantage of this method is that the process is mature and the product is stable. The disadvantage is that the production process produces harmful gases such as nitrogen oxides. Poor, there is a lot of waste water in the product cleaning process, the process steps are complicated, and the product is yellow; the second method is to melt pure metal tin at high temperature, and blow up oxygen oxidation method. The advantage of this method is that the process is simple, the steps are few, and the product is off-white.
Disadvantages are large energy consumption, high requirements for equipment, and products are prone to impurities

Method used

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  • Method for preparing tin dioxide directly by using tin-electrolyzed anode mud

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Effect test

Embodiment 1

[0017] A method for directly producing tin dioxide from tin electrolytic anode slime, the specific steps are: drying tin electrolytic anode slime at 60°C, crushing, passing through a 40-mesh sieve, heating at 700°C for 30 minutes, and then adding The mixed solution of hydrochloric acid, nitric acid, hydrogen peroxide, sodium chlorate, and potassium chlorate, which is 0.5 times the mass of tin electrolytic anode slime, is reacted at 60°C for 30 minutes, then centrifugally filtered, and the filter residue is added with sodium sulfite and sodium thiosulfate with a solid-to-liquid ratio of 1:0.5 , ammonium thiosulfate mixed solution was stirred for 2 hours, then precipitated, washed with water, filtered, and the filter residue was dried at 60°C, crushed, and packaged to obtain an industrial-grade tin dioxide product.

[0018] The concentration of hydrochloric acid is 1mol / L, the concentration of nitric acid is 1mol / L, the concentration of hydrogen peroxide is 1mol / L, the concentrat...

Embodiment 2

[0021] A method for directly producing tin dioxide from tin electrolytic anode slime, the specific steps are: drying tin electrolytic anode slime at 100°C, crushing, passing through a 40-mesh sieve, heating at 800°C for 60 minutes, and then adding The mixed solution of hydrochloric acid, nitric acid, hydrogen peroxide, sodium chlorate, and potassium chlorate, which is twice the mass of tin electrolytic anode slime, was reacted at 80°C for 50 minutes, then centrifugally filtered, and the filter residue was added with sodium sulfite and sodium thiosulfate with a solid-to-liquid ratio of 1:1. The mixed solution of ammonium thiosulfate and ammonium thiosulfate was stirred for 2.5 hours, then precipitated, washed with water, filtered, and the filter residue was dried at 200°C, crushed, and packaged to obtain an industrial-grade tin dioxide product.

[0022] Wherein the concentration of hydrochloric acid is 3mol / L, the concentration of nitric acid is 5mol / L, the concentration of hydr...

Embodiment 3

[0025] A method for directly producing tin dioxide from tin electrolytic anode slime, the specific steps are: drying tin electrolytic anode slime at 200°C, crushing, passing through a 40-mesh sieve, heating at 1000°C for 100 minutes, and then adding A mixed solution of hydrochloric acid, nitric acid, hydrogen peroxide, sodium chlorate, and potassium chlorate that is 3.5 times the mass of tin electrolytic anode slime was reacted at 90°C for 60 minutes, then centrifugally filtered, and the filter residue was added with sodium sulfite and sodium thiosulfate with a solid-to-liquid ratio of 1:1.5 The mixed solution of ammonium thiosulfate and ammonium thiosulfate was stirred for 3 hours, then precipitated, washed with water, filtered, and the filter residue was dried at 300°C, crushed, and packaged to obtain an industrial-grade tin dioxide product.

[0026] Wherein the concentration of hydrochloric acid is 6mol / L, the concentration of nitric acid is 10mol / L, the concentration of hyd...

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Abstract

The invention discloses a method for preparing tin dioxide directly by using tin-electrolyzed anode mud. The method comprises the following steps: the tin-electrolyzed anode mud is pretreated first to convert all tin elements into tin dioxide; then, hydrochloric acid, nitric acid, hydrogen peroxide, chlorine sodium, potassium chlorate and other agents are used for dissolving and removing other impurity elements, so that the tin anode mud can be used for producing tin dioxide with high yield and purity directly. The method greatly reduces the cost of the raw materials of tin dioxide, improves the economic value of per unit of tin, and reduces the emission of pollutants so as to contribute to environmental protection.

Description

technical field [0001] The invention relates to a method for directly preparing tin dioxide by utilizing tin electrolysis anode slime, which belongs to the field of chemical industry. Background technique [0002] Tin anode slime is a variety of substances that sink to the bottom of the tank during the electrolytic refining process of crude tin. The coarse tin electrolytic anode slime contains tin, antimony, arsenic, copper, lead, and bismuth with relatively high content, and its composition range fluctuates greatly, generally 35-50% tin, 7-18% antimony, 4-8% arsenic, 8-10% copper, 10-20% lead, 2-6% bismuth and a small amount of gold and silver. [0003] Currently, tin concentrates used for tin smelting have complex components, and tin products can be obtained through processes such as smelting, pyro-refining, and electrolytic purification. For a smelter that smelts complex tin concentrates, if it produces 15,000-20,000 tons of refined tin per year, it will produce 1,000-2,...

Claims

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Application Information

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IPC IPC(8): C01G19/02
Inventor 熊华亮
Owner 熊华亮
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