阅读说明：本技术 一种铬渣的干法解毒并资源化制砖的制备方法 (Preparation method of dry-process detoxified and resource-recycled brick making of chromium slag ) 是由 马兵 张后虎 闫佳莉 严小飞 张强 康国栋 于 2019-11-18 设计创作，主要内容包括：本发明涉及一种铬渣的干法解毒并资源化制砖的制备方法,属于危险废物减量化、无害化、资源化利用领域。包括步骤：将铬渣粉磨；将粉磨后的铬渣加入水中,搅拌均匀1～2h；在搅拌均匀的铬渣液中加入活性炭；电磁搅拌30～45min；将搅拌后的混合液中的活性炭分离,得到滤渣；在上述滤渣中加入添加剂,并加热反应20～30min后,烘干后与矿粉、水泥、粉煤灰、减水剂、速凝剂混合均匀,加水搅拌后在成型模具中成型制砖。实现了对铬渣的资源化再利用,处理的工艺过程简单高效,不但处理了生活危废,同时将其再利用,制成可作为建筑材料的砖,具有显著的社会和经济价值。(The invention relates to a preparation method of dry detoxification and resource brick making of chromium slag, belonging to the field of reduction, harmlessness and resource utilization of hazardous wastes. The method comprises the following steps: grinding the chromium slag; adding the grinded chromium slag into water, and uniformly stirring for 1-2 h; adding active carbon into the uniformly stirred chromium slag liquid; electromagnetically stirring for 30-45 min; separating the activated carbon in the stirred mixed solution to obtain filter residue; and adding an additive into the filter residue, heating for reaction for 20-30 min, drying, uniformly mixing with the mineral powder, cement, fly ash, a water reducing agent and an accelerating agent, adding water, stirring, and forming in a forming die to prepare the brick. The method realizes resource recycling of the chromium slag, has simple and efficient treatment process, treats the life hazardous waste, recycles the life hazardous waste simultaneously, and prepares the brick which can be used as a building material, thereby having remarkable social and economic values.)

1. A preparation method of dry detoxification and resource brick making of chromium slag is characterized in that: the method comprises the following steps:

(1) grinding the chromium slag;

(2) adding the grinded chromium slag into water, and uniformly stirring for 1-2 h;

(3) adding active carbon into the uniformly stirred chromium slag liquid; electromagnetically stirring for 30-45 min;

(4) separating the activated carbon in the stirred mixed solution to obtain filter residue;

(5) and adding an additive into the filter residue, heating for reaction for 20-30 min, drying, uniformly mixing with the mineral powder, cement, fly ash, a water reducing agent and an accelerating agent, adding water, stirring, and forming in a forming die to prepare the brick.

2. The preparation method of dry detoxification and resource brick making of chromium slag as claimed in claim 1, wherein the preparation method comprises the following steps: in the step (1), the chromium slag is ground to a particle size of less than 0.15 mm.

3. The preparation method of dry detoxification and resource brick making of chromium slag as claimed in claim 1, wherein the preparation method comprises the following steps: the ratio of water to chromium slag in the step (2) is 3-5: 1.

4. The preparation method of dry detoxification and resource brick making of chromium slag as claimed in claim 1, wherein the preparation method comprises the following steps: and (3) adding 1.4-1.6 g of activated carbon into each 100ml of chromium slag liquid.

5. The preparation method of dry detoxification and resource brick making of chromium slag as claimed in claim 1, wherein the preparation method comprises the following steps: the additive in the step (5) is Fe (OH)₃With Na₂S₂O₄A mixture of (a).

6. The preparation method of dry detoxification and resource brick making of chromium slag as claimed in claim 1, wherein the preparation method comprises the following steps: in the step (5), 8-10 g of additive is added into every 100ml of filtrate.

7. The preparation method of dry detoxification and resource brick making of chromium slag as claimed in claim 5, wherein the preparation method comprises the following steps: fe (OH)₃With Na₂S₂O₄The ratio of (A) to (B) is 2-4: 1.

Technical Field

The invention relates to a preparation method of dry detoxification and resource brick making of chromium slag, belonging to the field of reduction, harmlessness and resource utilization of hazardous wastes.

Background

Chromium slag is of great interest because of its high yield, high stockpiling, high toxicity and great difficulty in disposal, and is also classified as a hazardous waste. At present, the treatment of the chromium slag by a hazardous waste treatment center usually adopts safe landfill after solidification, but because hexavalent chromium in the chromium slag is easy to dissolve in water and is difficult to precipitate, the leaching concentration of the hexavalent chromium of a chromium slag solidified body is often out of standard, and serious pollution is caused to the environment.

Disclosure of Invention

Aiming at the problems, the invention provides a preparation method of bricks by dry detoxification and resource utilization of chromium slag, which realizes the reutilization of hazardous wastes and prepares building bricks.

In order to achieve the above purpose, the specific scheme of the invention is as follows:

a preparation method of dry detoxification and resource brick making of chromium slag comprises the following steps:

(1) grinding the chromium slag;

(2) adding the grinded chromium slag into water, and uniformly stirring for 1-2 h;

(3) adding active carbon into the uniformly stirred chromium slag liquid; electromagnetically stirring for 30-45 min;

(4) separating the activated carbon in the stirred mixed solution to obtain filter residue;

(5) and adding an additive into the filter residue, heating for reaction for 20-30 min, drying, uniformly mixing with the mineral powder, cement, fly ash, a water reducing agent and an accelerating agent, adding water, stirring, and forming in a forming die to prepare the brick.

Further, in the step (1), the chromium slag is ground to a particle size of less than 0.15 mm.

Further, the ratio of the water to the chromium slag in the step (2) is 3-5: 1.

Further, in the step (3), 1.4-1.6 g of activated carbon is added into each 100ml of chromium slag liquid.

Further, the additives in the step (5) are Fe (OH)3 and Na₂S₂O₄A mixture of (a).

Further, in the step (5), 8-10 g of additive is added into every 100ml of filtrate.

Further, Fe (OH)3 and Na₂S₂O₄The ratio of (A) to (B) is 2-4: 1.

Compared with the prior art, the invention has the beneficial effects that:

the method realizes resource recycling of the chromium slag, has simple and efficient treatment process, treats the life hazardous waste, recycles the life hazardous waste simultaneously, and prepares the brick which can be used as a building material, thereby having remarkable social and economic values.

Detailed Description