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Separation method for antimony and arsenic in antimony and arsenic material

A separation method and material technology, applied in the direction of improving process efficiency, etc., can solve the problems of high energy consumption for concentration and crystallization, large equipment corrosion, and large reagent consumption, etc., and achieve the effect of improving leaching rate, low production cost, and low raw material cost

Active Publication Date: 2018-11-13
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the wet method is that the reagent consumption is large and the equipment is corroded
[0003] Therefore, at present, some people use a combination of wet method and fire method to process high-arsenic and antimony materials. Patent application number CN201410065908.0 discloses a comprehensive recovery method for high-arsenic, antimony and oxygen fumes, that is, first mix antimony, arsenic and antimony fumes with sodium nitrate and alkali, Calcined at 400-680°C, after calcined, soaked in water and filtered to obtain sodium antimonate filter cake and sodium arsenate solution, then dried the sodium antimonate filter cake and concentrated sodium arsenate solution to obtain sodium antimonate and sodium arsenate solution respectively Sodium arsenate product: This method has a simple process flow and is easy to separate antimony and arsenic, but due to the relatively high temperature in the calcination process, it is inevitable that antimony and arsenic will volatilize, causing secondary pollution, and the concentrated crystallization of sodium arsenate solution consumes a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) After mixing 100g of antimony-arsenic material with a particle size of 100 mesh (59.35% of antimony and 20.14% of arsenic) with 106g of sodium peroxide (1.2 times the theoretical value required for the reaction of antimony and arsenic in the antimony-arsenic material), Calcined at 300°C for 5 hours to obtain a calcined product;

[0036] 2) Add water to the calcined product, stir, and carry out leaching at 65 ° C. After leaching for 1 hour, filter to obtain the leaching solution and leaching residue. The leaching residue is about 80% thick sodium metaantimonate, which can be used to prepare high-purity sodium pyroantimonate. Wherein the mass volume ratio of calcined product and water is 1:8g / ml;

[0037] 3) Add calcium oxide to the leaching solution, stir at room temperature, filter after reacting for 5 hours to obtain the filter residue and filtrate, dry the filter residue to obtain the calcium arsenate product, and return the filtrate to step 2), wherein the molar r...

Embodiment 2

[0039] 1) After mixing 100g of antimony-arsenic material with a particle size of 200 meshes (wherein antimony is 41.52%, arsenic 6.85%) and 76g of sodium peroxide (1.5 times the theoretical value required for the reaction of antimony and arsenic in the antimony-arsenic material), the Calcined at 350°C for 3 hours to obtain a calcined product;

[0040] 2) Add water to the calcined product, stir, and perform leaching at 50°C. After leaching for 2 hours, filter to obtain leaching solution and leaching slag. The leaching slag is about 80% thick sodium antimonate, which can be used to prepare high-purity sodium pyroantimonate. Wherein the mass volume ratio of calcined product and water is 1:12g / ml;

[0041] 3) Add calcium oxide to the leaching solution, stir at room temperature, filter after reacting for 2 hours to obtain the filter residue and filtrate, dry the filter residue to obtain the calcium arsenate product, and return the filtrate to step 2), wherein the molar ratio of the c...

Embodiment 3

[0043] 1) After mixing 100g of antimony-arsenic material with a particle size of 300 mesh (wherein antimony is 13.21%, arsenic 23.14%) and 98g of sodium peroxide (twice the theoretical value required for the reaction of antimony and arsenic in the antimony-arsenic material) Calcined at 300-390°C for 2-5 hours to obtain a calcined product;

[0044] 2) Add water to the calcined product, stir, and perform leaching at 55°C. After leaching for 5 hours, filter to obtain leaching solution and leaching slag. The leaching slag is about 80% thick sodium antimonate, which can be used to prepare high-purity sodium pyroantimonate. Wherein the mass volume ratio of calcined product and water is 1:20g / ml;

[0045] 3) Add calcium oxide to the leaching solution, stir at room temperature, filter after reacting for 1 hour to obtain the filter residue and filtrate, dry the filter residue to obtain the calcium arsenate product, and return the filtrate to step 2), wherein the molar ratio of the calc...

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Abstract

The invention discloses a separation method for antimony and arsenic in an antimony and arsenic material. The separation method comprises the following steps of uniformly mixing the antimony and arsenic material with sodium peroxide, calcining the mixture at 300-390 DEG C, adding water into the calcined product, stirring the calcined product, leaching the calcined product at 50-65 DEG C, filteringthe calcined product after leaching to obtain a lixivium; and adding calcium oxide into the lixivium, stirring the lixivium at a constant temperature, filtering the lixivium after full reaction to obtain filter residues and filtrate, and drying the filter residues to obtain a calcium arsenate product. By taking sodium peroxide as a primary raw material, the calcining temperature is relatively low, antimony and arsenic are prevented from being volatilized in the calcining process, and the antimony and arsenic recovery rates in later period are relatively high. Sodium peroxide which replaces sodium nitrate is taken as an oxidant, so that the material is oxidized more fully without generating oxynitride, and the environment is not polluted. As alkali is not added, the raw materials are low in cost and equipment is not corroded.

Description

technical field [0001] The invention belongs to the technical field of metal recovery, and in particular relates to a method for separating antimony and arsenic from antimony and arsenic materials. Background technique [0002] The melting and boiling points of antimony, arsenic and its oxides are similar. In the pyrometallurgical process, they generally enter the smoke and dust at the same time. The separation methods include pyrometallurgical and wet methods. The fire method mainly uses the difference in the boiling point of antimony arsenic trioxide to carry out step-by-step separation. For example, CN102233229A discloses a method for fire separation. The method is to volatilize arsenic trioxide at 680°C first, and then raise the temperature to 850°C to volatilize antimony trioxide; however, the pyrotechnic process consumes a lot of energy, the separation of antimony and arsenic is not complete, and there are problems such as arsenic-containing dust pollution. Wet method...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B30/02C22B30/04
CPCC22B7/001C22B7/006C22B7/02C22B30/02C22B30/04Y02P10/20
Inventor 陈兰尹涛谭霖
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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