阅读说明：本技术 一种褐铁矿协同铜渣吸附除砷的方法 (Method for removing arsenic by limonite and copper slag through adsorption ) 是由 祁先进 李雪竹 祝星 周春晖 卢治旭 李永奎 郝峰焱 于 2019-09-25 设计创作，主要内容包括：本发明涉及一种褐铁矿协同铜渣吸附除砷的方法,属于重金属污染治理技术领域。本发明将褐铁矿筛分至粒径为200~300目得到褐铁矿粉,将铜渣筛分至粒径为100~200目得到铜渣粉,将褐铁矿粉和铜渣粉混合均匀得到混合物A,将H<Sub>2</Sub>O<Sub>2</Sub>加入到污酸中混合均匀,置于温度为80~90℃条件下反应2~4 h,冷却至室温得到预处理污酸；将预处理污酸加入到混合物A中混合均匀,室温条件下震荡反应15~20 h,固液分离得到含砷固态物和滤液,含砷固态物堆存处理,滤液进行深度除砷处理。本发明利用天然矿石褐铁矿协同铜渣吸附除砷,不仅减少了污酸处理过程中污泥的堆存量,还达到了充分利用自然资源的目的。(The invention relates to a method for removing arsenic by limonite and copper slag adsorption, belonging to the technical field of heavy metal pollution treatment, the invention screens limonite to a particle size of 200 ~ 300 meshes to obtain limonite powder, screens copper slag to a particle size of 100 ~ 200 meshes to obtain copper slag powder, uniformly mixes the limonite powder and the copper slag powder to obtain a mixture A, and mixes H with the copper slag powder to obtain a mixture B 2 O 2 Adding the mixture into polluted acid, uniformly mixing, reacting for 2 ~ 4h at the temperature of 80 ~ 90 ℃, cooling to room temperature to obtain pretreated polluted acid, adding the pretreated polluted acid into the mixture A, uniformly mixing, performing oscillation reaction for 15 ~ 20h at the room temperature, performing solid-liquid separation to obtain arsenic-containing solid and filtrate, stacking the arsenic-containing solid, and performing deep arsenic removal treatment on the filtrate.)

1. A method for removing arsenic by limonite and copper slag adsorption is characterized by comprising the following specific steps:

(1) screening limonite to obtain limonite powder with the particle size of 200 ~ 300 meshes, and screening copper slag to obtain copper slag powder with the particle size of 100 ~ 200 meshes;

(2) uniformly mixing the limonite powder and the copper slag powder in the step (1) to obtain a mixture A;

(3) h is to be₂O₂Adding the mixture into waste acid, uniformly mixing, reacting for 2 ~ 4h at the temperature of 80 ~ 90 ℃, and cooling to room temperature to obtain pretreated waste acid;

(4) adding the polluted acid pretreated in the step (3) into the mixture A in the step (2), uniformly mixing, carrying out oscillation reaction for 15 ~ 20h at room temperature, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, carrying out stockpiling treatment on the arsenic-containing solid, and carrying out deep arsenic removal treatment on the filtrate.

2. The method for removing arsenic by adsorbing limonite and copper slag in cooperation with the copper slag according to claim 1, wherein the mass ratio of the limonite powder to the copper slag powder in the step (2) is (1 ~ 2): 1.

3. The method for removing arsenic by limonite and copper slag adsorption according to claim 1, which is characterized in that: step (3) H₂O₂The molar ratio of the arsenic in the waste acid to the arsenic in the waste acid is (1.1 ~ 1.3):1, and the arsenic content of the waste acid is 2100.0 ~ 5800.0 mg/L.

4. The method for removing arsenic by limonite and copper slag adsorption according to claim 1, wherein the solid-to-liquid ratio g: mL of the copper slag powder to the pretreated contaminated acid in the mixture A in the step (4) is 1 (1 ~ 1.5.5).

5. The method for removing arsenic by limonite and copper slag adsorption according to claim 1, wherein the oscillation rate in step (4) is 180 ~ 200 r/min.

Technical Field

The invention relates to a method for removing arsenic by limonite and copper slag adsorption, belonging to the technical field of heavy metal pollution treatment.

Background

Limonite, a natural ore widely present in nature, is mainly a hydroxide of iron such as goethite and contains hydrous silicon dioxideThe main elements of the limonite are Fe, Al and Si, and also contain As, S, Zn, Ti, K and other elements, the iron content is generally about 40 ~ 60 percent, the main phase of the limonite is Fe₂O₃And FeO (OH) nH₂And O. Limonite, as a natural iron ore widely existing in China, has low cost but low utilization rate.

The copper slag is slag generated in the copper smelting process, and belongs to non-ferrous metal slag. The copper slag comprises Fe, Si, O and other elements, the main components are iron and silicon oxide, the total weight of the copper slag is 83.57%, and the content of MgO, CaO and K is less than 6%₂The method has the advantages that the method is a large-consumption country of copper ore resources in China, the consumption of copper is very high, meanwhile, in the copper production mainly based on the pyrogenic process, 2 ~ 3t of slag is produced when 1t of copper is produced, the quantity of the copper slag is large, and the method has very important significance in developing a resource comprehensive utilization technology of the copper-containing slag.

Disclosure of Invention

The invention provides a method for removing arsenic by adsorbing limonite and copper slag in cooperation, aiming at the problems in the prior art, the method for removing arsenic by using low-cost natural ore limonite and solid waste resource copper slag is used, so that the stockpile of sludge in the waste acid treatment process is reduced, the purpose of fully utilizing natural resources is achieved, and the purpose of treating waste by using waste is realized.

A method for removing arsenic by limonite and copper slag adsorption comprises the following specific steps:

(1) screening limonite to obtain limonite powder with the particle size of 200 ~ 300 meshes, and screening copper slag to obtain copper slag powder with the particle size of 100 ~ 200 meshes;

(2) uniformly mixing the limonite powder and the copper slag powder in the step (1) to obtain a mixture A;

(3) h is to be₂O₂Adding the mixture into waste acid, uniformly mixing, reacting for 2 ~ 4h at the temperature of 80 ~ 90 ℃, and cooling to room temperature to obtain pretreated waste acid;

(4) adding the polluted acid pretreated in the step (3) into the mixture A in the step (2), uniformly mixing, carrying out oscillation reaction for 15 ~ 20h at room temperature, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, carrying out stockpiling treatment on the arsenic-containing solid, and carrying out deep arsenic removal treatment on the filtrate.

The mass ratio of the limonite powder to the copper slag powder in the step (2) is (1 ~ 2): 1.

Said step (3) H₂O₂The molar ratio of the arsenic in the waste acid to the arsenic in the waste acid is (1.1 ~ 1.3):1, and the arsenic content of the waste acid is 2100.0 ~ 5800.0 mg/L.

The solid-to-liquid ratio g/mL of the copper slag powder in the mixture A in the step (4) to the pretreated waste acid is 1:1 ~ 1: 1.5.

The oscillation rate of the step (4) is 180 ~ 200 r/min.

The principle of removing arsenic by limonite and copper slag adsorption is as follows: the iron content of the limonite and the copper slag is very high, Fe is easy to react with pentavalent As, hydrogen peroxide is added into the contaminated acid in the first step to be heated and oxidized for 2 hours, and trivalent As in the contaminated acid is completely oxidized into pentavalent As; then adding the mixture of the limonite and the copper slag, and simultaneously dissolving the limonite and the copper slag to release Fe under the acidic condition³⁺，Fe³⁺And As⁵⁺Removing arsenic by combining with the generated ferric arsenate; from the microscopic view, the periphery of the ore is diffused with As⁵⁺As once the Fe ion is released⁵⁺The iron arsenate generated in the way is completely adsorbed on the surface of the ore, and the adsorption of the limonite and the copper slag is reflected.

The invention has the beneficial effects that:

according to the invention, the limonite and the copper slag are used for adsorbing and removing arsenic, so that the stockpiling amount of sludge in the waste acid treatment process is reduced, the purpose of fully utilizing natural resources is achieved, and the purpose of treating wastes with processes of wastes against one another is realized; the brown iron ore coordinated copper slag adsorption treatment of the contaminated acid is adopted, the process operation is simple, the production cost is low, and the method has a wide market prospect.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments, but the scope of the present invention is not limited to the description.