Method for preparing stannic oxide and stannate from tin-copper slag

A technology of tin dioxide and stannate, applied in the direction of chemical instruments and methods, tin oxide, tin compounds, etc., can solve the problems of high production cost of tin dioxide and stannate, high cost of raw materials, waste of environment, etc., and achieve Reduced production cost, reduced production cost, and low purification cost

Pending Publication Date: 2021-07-02
云南锡业研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The raw material that above-mentioned prior art method adopts is all refined tin, and raw material cost is higher, causes the production cost of tin dioxide and stannate to be also higher
[0009] In the welding process, a large amount of tin-copper slag will be produced, and its impurity content is relatively high, but there is still a certain amount of tin and copper left. If it is discarded, it will be a waste and cause certain pollution to the environment. It is meaningful to use the low-cost and effective way of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Utilize tin-copper slag to prepare the method for tin dioxide and stannate, concrete steps are as follows:

[0028] (1) Take 2000g of tin-copper slag containing 14.5wt.% of copper, 70wt.% of tin, 0.08wt.% of lead, 1.2wt.% of iron, 0.8wt.% of arsenic, and 9.9wt.% of sulfur, and use a rod mill The machine carries out wet grinding according to the pulp concentration of 45%, and grinds for 50 minutes. After the grinding pulp is screened by a 60-mesh drum sieve, 301.5g of sieve material (tin flowers) containing 87.45wt.% of tin and 1.58wt.% of copper are obtained And -60 mesh pulp, -60 mesh pulp enters the 100 mesh trommel sieve to get the material on the screen and -100 mesh pulp, the material on the screen is returned to continue grinding, and the -100 mesh pulp is filtered to obtain 1680g of tin containing 66.42wt.% , Powdered tin material containing 18.34wt.% copper, the filtrate is returned to the grinding system for recycling.

[0029] (2) 400g potassium hydroxide is ...

Embodiment 2

[0032] Utilize tin-copper slag to prepare the method for tin dioxide and stannate, concrete steps are as follows:

[0033](1) Put 2000g of tin-copper slag containing 5wt.% of copper, 89.24wt.% of tin, 0.022wt.% of lead, 2wt.% of iron, 1.2wt.% of arsenic and 3.52wt.% of sulfur into a rod mill Carry out wet grinding by pulp concentration 70%, grind ore for 15 minutes, obtain 364.5g of sieve material (tin flowers) containing tin 93.34wt.% and copper 0.35wt.% after grinding ore pulp is sieved through 60 mesh drum sieves and -60 mesh pulp, -60 mesh pulp enters the 100 mesh trommel sieve to obtain the material on the screen and -100 mesh pulp, the material on the screen returns to continue grinding, and the -100 mesh pulp is filtered to obtain 1623g of tin containing 88.96wt.%. Powdered tin material containing 5.93wt.% copper, the filtrate is returned to the grinding system for recycling.

[0034] (2) 400g sodium hydroxide is dissolved in 2L deionized water to obtain alkalinity and...

Embodiment 3

[0037] Utilize tin-copper slag to prepare the method for tin dioxide and stannate, concrete steps are as follows:

[0038] (1) Take 2000g of tin-copper slag containing 18.21wt.% of copper, 69.56wt.% of tin, 0.058wt.% of lead, 0.1wt.% of iron, 1.1wt.% of arsenic, and 6.52wt.% of sulfur. The mill carries out wet grinding according to the slurry concentration of 40%, and the grinding is carried out for 60 minutes. After the grinding slurry is sieved by a 40-mesh drum sieve, 297.5g of sieve material containing 89.34wt.% of tin and 2.65wt.% of copper (tin flower ) and -40 mesh pulp, the -40 mesh pulp enters the 100 mesh trommel sieve and screens to obtain the on-screen material and -100 mesh pulp, the on-screen material returns to continue grinding, and the -100 mesh pulp is filtered to obtain 1703g of tin containing 65.35wt. %, powdered tin material containing 20.89wt.% copper, the filtrate is returned to the grinding system for recycling.

[0039] (2) 400g sodium hydroxide is di...

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Abstract

The invention relates to a method for preparing stannic oxide and stannate from tin-copper slag, wherein the method comprises the steps: grinding the tin-copper slag containing metallic tin, screening, and screening by using a 40-mesh screen or a 60-mesh screen to obtain an oversize material which is flaky tin flowers and is used as a raw material for preparing potassium stannate; filtering the undersize material which passes through a 100-mesh screen to obtain a powdery tin material which is used as a raw material for preparing tin dioxide; making the tin flowers and alkali liquor into a stannate solution at high temperature and high pressure in an oxidizing atmosphere, and producing a stannate product after the solution is concentrated and crystallized; and synthesizing a tin dioxide intermediate product from the powdery tin material and sulfuric acid in a closed container at high temperature and high pressure in an oxidizing atmosphere, washing with water, neutralizing with ammonium bicarbonate, drying and calcining a solid obtained by liquid-solid separation to obtain a tin dioxide product, returning residual liquid to prepare a sulfuric acid solution until the copper content reaches 48-52 g / l, and concentrating and crystallizing to produce a copper sulfate product. Tin-copper slag grading is achieved through a physical method, stannate and stannic oxide are produced through different technological methods, and the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and chemical industry, and in particular relates to a method for directly synthesizing tin dioxide and stannate by using tin-copper slag. Background technique [0002] Tin dioxide (SnO 2 ) has a wide range of industrial uses, mainly used in the production of ceramics, enamel, glass, electronic devices, decorative materials, etc., and also used in the production of chemical reagents such as glazes, pigments, flame retardants, and catalysts. [0003] At present, the methods for preparing tin dioxide are mainly gasification method and nitric acid method. The gasification method is mainly to blow molten tin into hot air at high temperature and directly oxidize it to form tin dioxide. The nitric acid method is the reaction of tin flowers and nitric acid to produce metastannic acid, and then calcined at high temperature to obtain tin dioxide products. Most of the industry is based on the nitri...

Claims

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Application Information

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IPC IPC(8): C01G19/02C01G19/00C01G3/10
CPCC01G19/02C01G19/00C01G3/10C01P2006/80Y02P10/20
Inventor 苏瑞春李发祥杨习文张旭李志鹏后宝明张雄林
Owner 云南锡业研究院有限公司
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